Tag Archives: Rotary dumper

Power Plant Spider in the Eye

If you have been following my posts for very long, you may have the idea that I just like to write posts about spiders.  After writing two posts about Spider Wars (see posts:  “Power Plant Spider Wars and Bugs in the Basement” and “Power Plant Spider Wars II – The Phantom Menace“), another post about spiders just seems like a bit much.  Even though there is a spider in this story, another appropriate title could be something like “Another night in the Life of a Power Plant Electrician”.  Without further ado, here is the story.

Ninety nine times out of a hundred, when the phone rang in the middle of the night, it was the Power Plant in North Central Oklahoma calling.  I don’t remember a time when the Shift Supervisor on the other end of the phone wasn’t very polite.  They knew they were waking someone from their sleep to ask them to drive 30 miles out to the plant in the wee hours of the morning.

The Shift Supervisor, whether it was Joe Gallahar, Jim Padgett, Jack Maloy, or Gary Wright, they would all start out with something like, “Hey, sorry to wake you buddy…”.  After such an apologetic introduction, how could you be upset that your sleep had just been interrupted?  Then they would proceed to tell you why they needed your assistance.  For me, it was usually because the coal dumper had stopped working while a train was dumping their coal.  This meant that 110 cars tied to three or four engines was sitting idle unable to move.

Each car on the train would be dumped one at a time as it was pulled through the rotary dumper.  The process was automated so that the operator in the control room watching out of the window only had to push one switch to dump each car.

A rotary dumper much like the one that was at our Power Plant

A rotary dumper much like the one that was at our Power Plant

The train would move forward to the next car automatically as a large arm on a machine called a Positioner would come down on the coupling between the cars and pull the entire train forward to the next car.

The piece of equipment with the large wheels is the positioner It can pull a coal train full of coal forward to precisely the proper position

The piece of equipment with the large wheels is the positioner It can pull a coal train full of coal forward to precisely the proper position

There were so many moving parts involved in positioning the car in place and rolling it over to dump the coal, that it was common for something to go wrong.  When that happened the entire process would come to a halt and the train would just have to sit there until someone came to fix it.  That was usually an electrician since the dumper and the positioner was all controlled by relays much like the elevator controls, only more complicated.

This particular night, Joe Gallahar had called me.  It seemed that there was an intermittent problem with the dumper that didn’t seem to make much sense and they couldn’t figure out why it was acting so strange.  One of the train cars had actually been damaged as the positioner arm would start coming up from the coupling to the point where the holding arm on the other end of the dumper had come up, then the positioner arm began going back down, causing the train to move on it’s own only to have the arm on the positioner scrape the side of the train car as it rolled backward uncontrolled.

Though it was less frequent, it was not so strange to have a train damaged by erratic dumper controls.  I have seen the side of a train car smashed in by the positioner arm when it decided to inappropriately come down.  This night, the problem was acting like that.  So, instead of damaging the train further, they decided to call me out to have a look at it.

I always had the philosophy when being called out in the middle of the night to be just as polite back to the Shift Supervisor when I answered the phone.  I had a Marketing professor at Oklahoma State University named Dr. Lee Manzer, who explained this one day.

Here is a short side story about Dr. Manzer —

Dr. Manzer told a story in class one day about how he was travelling home one day from a long and difficult trip where everything had gone wrong.  It was very late at night when he arrived at his house (which, incidentally was just down the street from my parent’s house), he was really beat.  He went into his bedroom and began preparing for bed.

About the time he was taking off his tie, his wife rolled over in bed and welcomed him home.  Then she said, “Oh, by the way.  I forgot to buy milk (or maybe it was ice cream).  Do you think you could run down to the store and buy some?”

Dr. Manzer explained his decision making process at that point like this:  “I could either go on a rant and tell my wife what a long and tiring day I had just had and now you are asking me to go buy milk? , and then I would go get the milk.  Or I could say, ‘Of course Dear.  I would be glad to go buy some milk.’  Either way, I was going to go buy the milk.  So, I could do it one of two ways.  I could complain about it or I could be positive.  I could either score points or lose them…. hmm…. Let’s see…. what did I do?  I said, ‘Of course Dear.'”

— End of the side story about Dr. Lee Manzer who by the way was a terrific Marketing Professor.  I understand he still teaches to this day.

So, when Joe Gallahar called me that night, and explained that the dumper was acting all erratic, Instead of saying “Yes Dear.”  as that wouldn’t have been appropriate, I told him, “No problem.  I’ll be there as soon as I can.”  My wife Kelly knew who was on the other end of the phone when she heard my answer.  She had heard it many times before.  I usually only had to say one word after hanging up the phone, “Dumper”, and she knew what that meant.

A Power Plant Electrician’s spouse knows that this is part of the job.  As I pulled on the jeans that I had laid out before I went to bed, Kelly would usually say something in her sleep like, “Be careful”.  I would give her a hug and tell her I’ll be back in a while, even though, sometimes I would be gone for two days working on the precipitator during a start up or some major catastrophe.  Usually, it was just a couple of hours before I came crawling back in bed.

This particular night I drove to work in silence with the window open so that the cool air would keep me awake.  Normally I had the radio on some rock station so that I would be singing along (in my terribly off-key singing voice) in order to stay awake.  Sometimes I would just take the 25 minutes of silence to just think.

My thought that night was that it was nice to be wanted.  There is some comfort in knowing that the Shift Supervisor could call me with enough confidence to know that I would be able to come out on my own and fix a problem that was costing the company a large amount of money each hour the dumper was offline.  Some might think that I would be annoyed to be wakened in the middle of the night to go fix something at the plant.  That night, as most nights I was feeling honored.

That wasn’t always the case, and I’ll soon write a post about another call out in the middle of the night where Scott Hubbard and I wondered exactly why they called us… but that’s another story.

When I arrived at the plant, I rolled my car up to the speaker at the front gate and said, “Hello” with an arrogant English accent.  I don’t know why, but I always liked doing that.  I think it was Billy Epperson who answered back.  I told him I was here to work on the dumper.  He thanked me and opened the gate and I drove the 1/2 mile down the hill to the plant parking lot.  As I went over the hill, in the moonlight I could see the train up at the coal yard looking like a long silver snake.

I walked into the maintenance shop and grabbed a truck key off of the hook and drove around to the electric shop to pick up my hard hat and tool bucket.

This is an actual picture of my tool bucket

This is an actual picture of my tool bucket

I took the long way around to the coal yard since the train blocked the shortest route.  We had a tunnel on the west end of the coal yard that went under the tracks for just this occasion.

When I arrived at the dumper, Stanley Robbins explained that he had tried troubleshooting this problem himself, but he couldn’t find anything that would explain the strange behavior.  Since the last downsizing, we were all able to sort of mix our skills so that an operator could do simple electric tasks if they felt comfortable with it.  Stanley knew enough to fix your normal minor dumper issues.  This one was a little different.

Since I had been an electrician for the past 15 years at this point, I felt pretty confident that I would quickly find the problem and be heading back home soon.  So, I walked into the dumper switchgear where the dumper controls are found.  I asked Stanley to go turn on the power to the dumper so that I could watch the relays.  When the power was on, I began tracing the circuits looking for the point of failure.

The problem was intermittent, and when Stanley started the dumper back up, everything seemed to be working just fine.  Stanley explained that this was why they couldn’t use the dumper because they couldn’t be sure when it was going to malfunction.  They had even uncoupled the train and pulled it apart right where the positioner arm was so that I could see what was happening.

Using radios (walkie talkies), I asked Stanley to move the positioner arm up and down while I checked it.  He lowered it and raised it back up without any problem.  When he began lowering it the second time, it suddenly stopped halfway down.  Watching the controls, I could see that it indicated that it had come all the way down.  It would be this case that would tell the holding arm on the far side of the dumper to go back up, which is what happened when the train rolled back earlier that night.

Then the relays rattled like they were picking up and dropping out rapidly.  Then the problem cleared up again.  Somehow the positioner arm had thought it had come down on the car clamps when it was still up in the air.  That was not likely to happen because when something fails it usually doesn’t see what it’s supposed to see, not the other way around.  It doesn’t usually see something that isn’t there.

So, I had Stanley lower the positioner arm down so that it was level with the ground, so that I could check the connections to the electric eye that was on the positioner clamp that detected the train car clamp when it came down.  I couldn’t find any lose connections or anything that would explain it.

So I told Stanley that I was going to look up from under the car clamp to look at the electric eye.  So, I asked him to kill the power to the positioner so that it wouldn’t move while I was doing that and crush me like a bug.  Kneeling on the train track, I took my flashlight and looked up at the electric eye from under the car clamp, and this is what I saw:

A spider almost like this

A spider almost like this

This spider had built a spider web in front of the electric eye on the positioner and was sitting right in the middle causing the positioner to think it was down on the car clamp when it wasn’t.  Stanley was watching me from the window of the dumper control room when he saw me stand up quickly and look up at him with a big grin on my face.  I gave him a thumbs up.

You know the phrase, “Everyone has 10 minutes of fame….”  It indicates that some time in most people’s lives they are famous for a brief moment.  It may or may not define the rest of their life.  Well.  This was that spiders claim to fame.  This one spider had successfully stranded a coal train with 110 cars of coal.  A train crew, a coal yard operator, and one lone electrician that had traveled 30 miles to watch it act out it’s drama of catching gnats on it’s web being constantly watched by one large electric eye.

I did not drive home in silence that early morning.  I laughed out loud all the way home.  I still laugh to myself to this day when I think about this night.  Phrases like, “Isn’t life wonderful” comes to my mind.  Or “Even Spiders desire attention every now and then.”  Could there have been a better malfunction than to have a spider dancing in front of an electric eye out in the plains of Oklahoma saying, “Look at me!  Look at me!”  and by golly.  Someone did!  I’m just glad it was me.

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Lifecycle of a Power Plant Lump of Coal

Originally posted August 16, 2013:

Fifty Percent of our electricity is derived from coal. Did you ever wonder what has to take place for that to happen? I thought I would walk through the lifecycle of a piece of coal to give you an idea. I will not start back when the it was still a tree in a prehistoric world where dinosaurs grew long necks to reach the branches. I will begin when the large scoop shovel digs it out of the ground and loads it onto a coal truck.

The coal is loaded onto trucks like these before it is dumped onto the train cars. This photo was found at http://www.gillettechamber.com/events/eventdetail.aspx?EventID=2827

The coal is loaded onto trucks like these before it is dumped onto the train cars. This photo was found at http://www.gillettechamber.com/events/eventdetail.aspx?EventID=2827

The coal for the power plant in North Central Oklahoma came from Wyoming. There were trains from the Black Thunder Mine and the Powder River Basin.

Coal Trains on their way to power plants

Coal Trains on their way to power plants

It’s a long ride for the lump of coal sitting in the coal train on it’s way to Oklahoma. Through Nebraska and Kansas. It’s possible for the coal to be visited by a different kind of traveler. One that we may call “A tramp.” Someone that catches a ride on a train without paying for the ticket.

One time a tramp (or a hobo, I don’t remember which), caught a ride on one of our coal trains. They forgot to wake up in time, and found their self following the lumps of coal on their next phase of the journey. You see. Once the coal reached the plant, one car at a time enters a building called the “Rotary Dumper”.

A rotary dumper much like the one that was at our Power Plant

A rotary dumper much like the one that was at our Power Plant

As each train car enters the dumper four clamps come done on the car and it rolls upside down dumping the coal into a bin below. Imagine being a tramp waking up just in time to find yourself falling into a bin full of coal. with a car full of coal dumping coal on top of you. One coal car contained 102 tons of coal (today they carry 130 tons). Today one train contains 13,300 tons of coal. This is over 26 million pounds of coal per train.

Miraculously, this passenger survived the fall and was able to call for help or someone saw him fall. He was quickly rescued and brought to safety. Needless to say, the tramp went from being penniless to being, “comfortable” very quickly. I don’t know that it made the news at the time. I think the electric company didn’t want it to become “viral” that they had dumped a hobo into a coal bin by accident. Well. They didn’t know what “going viral” meant at the time, but I’m sure they had some other phrase for it then.

Ok. Time for a Side Story:

Since I’m on the subject of someone catching a clandestine ride on a train, this is as good of a place as any to sneak in the tragic story of Mark Meeks. Well. I say it was tragic. When Mark told the story, he seemed rather proud of his experience. You see. Mark was a construction electrician. He hired on as a plant electrician in order to settle down, but in his heart I felt like he was always a construction electrician. That is, he didn’t mind moving on from place to place. Doing a job and then moving on.

Mark explained that when he was working at a construction job in Chicago where he worked for 2 years earning a ton of overtime, he figured that by the time he finished he would have saved up enough to buy a house and settle down. He was married and living in an apartment in Chicago. He didn’t spend much time at home as he was working 12 hour days at least 6 days each week. He figured that was ok, because when he was done, he would be set for life.

Unknown to him at the time, each morning when he woke up before the crack of dawn to go to work, his wife would drive to O’Hara airport and catch a plane to Dallas, Texas where she was having an affair with some guy. By the time Mark returned from work 14 hours later, she was back home. Each day, Mark was earning a ton of overtime, and his wife was burning it on airline tickets.

When the two years were over, Mark came home to his apartment to collect his wife and his things and go live in peace in some small town some where. That was when he learned that his wife had been having the affair and using all his money to do it. She was leaving him. Penniless.

Completely broke, Mark drifted around for a while. Finally one day he saw a train that was loaded down with wooden electric poles. Mark figured that wherever those poles were going, there was going to be work. So, he hopped on the train and traveled all the way from Minneapolis Minnesota riding in the cold, wedged between some wooden poles on one of the cars on the train.

The train finally arrived at its destination somewhere at a port in the Gulf of Mexico. I don’t remember if it was Mississippi or Louisiana. He watched as they unloaded the poles, waiting to see what jobs were going to be needed for whatever the poles were for. He watched as they took the large wooden poles and piled them up in the ocean. They were using them to build up the shoreline. There were no jobs.

It is when you have been beaten down to the point of breaking when you reach a very important point in your life. Do you give up, or do you pick yourself up and make something of yourself? Mark chose the latter. He was a natural fighter. He eventually ended up at our plant as contract help, and then was hired as a plant electrician.

End of side story.

Let’s follow the lump of coal after it is poured out of the coal train in the dumper…

The coal is fed onto a conveyor belt. Let’s call this Conveyor 1, (because that is what we called it in the plant). This has a choice to feed it onto belt 2 which leads up to the stack out tower, or it can feed the other way to where some day it was planned to add another conveyor with another stackout tower. This was going to go to a pile of coal for two other units that were never built.

Anyway, when the coal drops down on Conveyor 2, way under ground, it travels up to the ground level, and continues on its way up to the top of the stackout tower where it feeds onto Belt 3. Belt 3 is a short belt that is on an arm that swings out over the coal pile. The coal is fed onto the coal pile close to the stack out tower. I suppose it is called stack out, because the coal is stacked up next to the tower.

A view of the coalyard from the top of the Smoke Stack

A view of the coalyard from the top of the Smoke Stack. The tower with the conveyor running up to the top is the stack out tower. Belt 3 is the arm pointing to the right in this picture

Anyway, there are large dozers (bulldozers) and dirt movers that pickup the coal and spread it out to make room for more coal from more coal trains. As mentioned above. One train now carries 26 million pounds of coal.

Dirt Mover full of coal

Dirt Mover full of coal

the coal that is spread out on the coal pile has to stay packed down otherwise it would spontaneously combust. That is, it would catch on fire all by itself. Once coal on a coal pile catches on fire it is impossible to “reasonably” put out. You can spray all the water on it you want and it won’t go out. When a fire breaks out, you just have to drag the burning coal off of the pile and let it burn out.

In order to keep the coal from performing spontaneous combustion, the dirt movers kept it packed down. As long as the coal is packed tight, air can’t freely reach the buried coal, and it doesn’t catch fire. So, dirt movers were constantly driving back and forth on the coal pile to keep the coal well packed. Even on the picture of the coalyard above from the smoke stack, you can see two pieces of heavy equipment out on the coal pile traveling back and forth packing the coal.

Anyway, the next phase in the life of the lump of coal happens when it finds itself directly under the stack out tower, and it is fed down by a vibratory feeder onto a conveyor. In our plant, these belts were called, Belts 4, 5, 6 and 7. Belts 4 and 5 fed onto Belt 8 and belts 6 and 7 fed onto belt 9.

Belts 8 and 9 brought the coal up from under the coal pile to the top of the Crusher tower. In the picture above you can see that tower to the right of the stack out tower with the long belts coming from the bottom of the tower toward the plant. The crusher tower takes the large lumps of coal that can be the size of a baseball or a softball and crushes it down to the size of marbles and large gumballs.

Coal conveyor carrying coal to the coal silos from the coalyard

Coal conveyor carrying coal to the coal silos from the coalyard. This is the size of the coal after it has been crushed by the crusher

From the crusher tower the lump of coal which is now no more than a nugget of coal travels from the coal yard up to the plant on belts 10 and 11.

conveyor 10 and 11 are almost 1/2 mile long

conveyor 10 and 11 are almost 1/2 mile long

Up at the top of this belt in the distance you can see another tower. This tower is called the Transfer tower. Why? Well, because it transfers the coal to another set of belts, Belt 12 and 13. You can see them going up to the right to that tower in the middle between the two boilers.

The tower between the two boilers is called the Surge Bin tower. That basically means that there is a big bin there that can hold a good amount of coal to feed to either unit. At the bottom of the white part of the tower you can see that there is a section on each side. This is where the tripper galleries are located. There are two belts in each tripper, and two belts that feed to each tripper belt from the surge bin. So, just to keep counting, Belts 14 and 15 feed to unit one and belts 16 and 17 feed to unit 2 from the surge bin. then Belts 18 and 19 are the two tripper belts that dump coal into the 6 silos on unit one, while belts 20 and 21 feed the silos on unit 2.

Once in the Coal silos, the coal is through traveling on belts. The silos are positioned over things called bowl mills. The coal is fed from the silo into the bowl mill through something called a Gravimetric feeder, which is able to feed a specific amount of coal into the bowl mill. This is the point that basically decides how hot the boiler is going to be.

Once the coal leaves the gravimetric feeder and drops down to the bowl mill, it is bound for the boiler. The gravimetric feeder is tied right to the control room. When they need to raise load more than just a minimal amount, a control room operator increases the amount of coal being fed from these feeders in order to increase the flow of coal into the boiler….. I don’t know… maybe it’s more automatic than that now…. The computer probably does it these days.

When the nugget of coal falls into the bowl mill the long journey from the coal mine in Wyoming is almost complete. Its short life as a nugget is over and it is pulverized into powder. The powder is finer than flour. Another name for a bowl mill is “Pulverizer”. The coal comes from the Powder River Basin in Wyoming and just before it is consumed in Oklahoma it really does become powder.

Big rollers are used to crush the coal into fine particles. The pulverized coal is blown up pipes by the primary air fans and blown directly into the boiler where they burst into flames. A bright orange flame. The color reminds me of orange sherbet Ice cream.

The color of the fireball in the boiler

The color of the fireball in the boiler

At this point an incredible thing happens to the coal that so many years ago was a part of a tree or some other plant. The chemical process that trapped the carbon from the carbon dioxide millions of years earlier is reversed and the carbon is once again combined to the oxygen as it was many millennium ago. A burst of heat is released which had been trapped after a cooling effect below the tree as it sucked the carbon out of the environment way back then.

The heat is transferred to the boiler tubes that line the boiler. The tubes heat the water and turn it into steam. The steam shoots into the turbine that turns a generator that produces the electricity that enters every house in the country. The solar power from eons ago that allowed the tree to grow is being used today to power our world. What an amazing system.

To take this one step further, the carbon dioxide that is released into the atmosphere today is replenishing the lost carbon dioxide from many years ago. Back when plants could breathe freely. Back before the carbon dioxide level was depleted almost to the point of the extinction of plant life on this planet. Remember, what we look on as a pollutant and a poison, to a plant is a chance to grow. The Sahara desert used to be a thriving forest. Maybe it will be again some day.

So, there is the question of global warming. We humans are so short sighted sometimes. We want to keep everything the same way we found it when we were born. We try desperately to keep animals from becoming extinct. We don’t think about the bazillions (ok, so I exaggerate) of animals that were extinct long before man arrived. It is natural for extinction to occur. That is how things evolve. We are trying to keep a system the same when it has always been changing.

Years from now we may develop ways to harness the energy from the sun or even from the universe in ways that are unimaginable today. When that time arrives, let’s just hope that we remain good stewards of the world so that we are around to see it. I believe that the use of fossil fuels, (as odd as that may seem) is a major step in reviving our planet’s natural resources.

Comments from the previous repost:

twotiretirade  August 20, 2014

Glad Mark fought the good fight, still a sad story.


Antion August 21, 2014
Great read. I love knowing how things work. As I read the sad story of the traveling electrician, I kept wondering if she could have pulled that off in today’s world of air travel.


hiwaychristian August 22, 2014
when I went to the Christian College in Eugene Oregon, they forced me to take a course in biology at the University of Oregon. I willingly sat and listened to the mix of science and evolution. I admit their perspective was intriguing.
at the end of the class, the last day, the instructor asked each one of her students to tell how the class had affected their thinking.
each one gave the politically correct answer in a variety of form. all the while I sat joyfully waiting my turn.
my response hushed the class for a moment. (it’s been some decades ago so I have to paraphrase but let it be sufficient) “I’m impressed with all the material you’ve covered. it’s astounding to think of all the things that were. but for me this class has only glorified my God. because I realize that in his wisdom he created gasoline for my car.”
you’ve covered a lot of material in your post. and I’m impressed at your diligence to complete it. I thank God for His faithfulness that he has put into you. may He prosper your testimony for the glory of His Holy Son.
By His Grace
(please overlook the syntax errors in this reply it was generated on a mobile device)

Monty Hansen November 4, 2014

We processed several hobo’s through our coal system, & injured a few, but none ever got anything from the power company. I remember we would always worried about finding a chunk of scalp or something in the grating where the tripper car drops coal down into the silo. One especially memorable event was when a coal yard operator found a down vest jacket on the coal pile and bragged about how lucky he was to find this jacket, the size even fit, but the jacket did smell a little funny. yes it was ripped off the body of a hobo by the plow above conveyor one & shot out onto the coal pile by the stackout conveyor.

It was always unnerving to have a pull cord go down in the middle of the night deep down in the coal trestle, while the belts were shut down. You’d have to go down there alone, in the dark & reset the pull cords, so the belts could be started later when needed. You knew it wasn’t a trick because the whole crew had been up in the control room together eating dinner or something. You always wondered if you might run into a real hobo – or the ghost of one.

Power Plant Spider in the Eye

If you have been following my posts for very long, you may have the idea that I just like to write posts about spiders.  After writing two posts about Spider Wars (see posts:  “Power Plant Spider Wars and Bugs in the Basement” and “Power Plant Spider Wars II – The Phantom Menace“), another post about spiders just seems like a bit much.  Even though there is a spider in this story, another appropriate title could be something like “Another night in the Life of a Power Plant Electrician”.  Without further ado, here is the story.

Ninety nine times out of a hundred, when the phone rang in the middle of the night, it was the Power Plant in North Central Oklahoma calling.  I don’t remember a time when the Shift Supervisor on the other end of the phone wasn’t very polite.  They knew they were waking someone from their sleep to ask them to drive 30 miles out to the plant in the wee hours of the morning.

The Shift Supervisor, whether it was Joe Gallahar, Jim Padgett, Jack Maloy, or Gary Wright, they would all start out with something like, “Hey, sorry to wake you buddy…”.  After such an apologetic introduction, how could you be upset that your sleep had just been interrupted?  Then they would proceed to tell you why they needed your assistance.  For me, it was usually because the coal dumper had stopped working while a train was dumping their coal.  This meant that 110 cars tied to three or four engines was sitting idle unable to move.

Each car on the train would be dumped one at a time as it was pulled through the rotary dumper.  The process was automated so that the operator in the control room watching out of the window only had to push one switch to dump each car.

A rotary dumper much like the one that was at our Power Plant

A rotary dumper much like the one that was at our Power Plant

The train would move forward to the next car automatically as a large arm on a machine called a Positioner would come down on the coupling between the cars and pull the entire train forward to the next car.

The piece of equipment with the large wheels is the positioner  It can pull a coal train full of coal forward to precisely the proper position

The piece of equipment with the large wheels is the positioner It can pull a coal train full of coal forward to precisely the proper position

There were so many moving parts involved in positioning the car in place and rolling it over to dump the coal, that it was common for something to go wrong.  When that happened the entire process would come to a halt and the train would just have to sit there until someone came to fix it.  That was usually an electrician since the dumper and the positioner was all controlled by relays much like the elevator controls, only more complicated.

This particular night, Joe Gallahar had called me.  It seemed that there was an intermittent problem with the dumper that didn’t seem to make much sense and they couldn’t figure out why it was acting so strange.  One of the train cars had actually been damaged as the positioner arm would start coming up from the coupling to the point where the holding arm on the other end of the dumper had come up, then the positioner arm began going back down, causing the train to move on it’s own only to have the arm on the positioner scrape the side of the train car as it rolled backward uncontrolled.

Though it was less frequent, it was not so strange to have a train damaged by erratic dumper controls.  I have seen the side of a train car smashed in by the positioner arm when it decided to inappropriately come down.  This night, the problem was acting like that.  So, instead of damaging the train further, they decided to call me out to have a look at it.

I always had the philosophy when being called out in the middle of the night to be just as polite back to the Shift Supervisor when I answered the phone.  I had a Marketing professor at Oklahoma State University named Dr. Lee Manzer, who explained this one day.

Here is a short side story about Dr. Manzer —

Dr. Manzer told a story in class one day about how he was travelling home one day from a long and difficult trip where everything had gone wrong.  It was very late at night when he arrived at his house (which, incidentally was just down the street from my parent’s house), he was really beat.  He went into his bedroom and began preparing for bed.

About the time he was taking off his tie, his wife rolled over in bed and welcomed him home.  Then she said, “Oh, by the way.  I forgot to buy milk (or maybe it was ice cream).  Do you think you could run down to the store and buy some?”

Dr. Manzer explained his decision making process at that point like this:  “I could either go on a rant and tell my wife what a long and tiring day I had just had and now you are asking me to go buy milk? , and then I would go get the milk.  Or I could say, ‘Of course Dear.  I would be glad to go buy some milk.’  Either way, I was going to go buy the milk.  So, I could do it one of two ways.  I could complain about it or I could be positive.  I could either score points or lose them…. hmm…. Let’s see…. what did I do?  I said, ‘Of course Dear.'”

— End of the side story about Dr. Lee Manzer who by the way was a terrific Marketing Professor.  I understand he still teaches to this day.

So, when Joe Gallahar called me that night, and explained that the dumper was acting all erratic, Instead of saying “Yes Dear.”  as that wouldn’t have been appropriate, I told him, “No problem.  I’ll be there as soon as I can.”  My wife Kelly knew who was on the other end of the phone when she heard my answer.  She had heard it many times before.  I usually only had to say one word after hanging up the phone, “Dumper”, and she knew what that meant.

A Power Plant Electrician’s spouse knows that this is part of the job.  As I pulled on the jeans that I had laid out before I went to bed, Kelly would usually say something in her sleep like, “Be careful”.  I would give her a hug and tell her I’ll be back in a while, even though, sometimes I would be gone for two days working on the precipitator during a start up or some major catastrophe.  Usually, it was just a couple of hours before I came crawling back in bed.

This particular night I drove to work in silence with the window open so that the cool air would keep me awake.  Normally I had the radio on some rock station so that I would be singing along (in my terribly off-key singing voice) in order to stay awake.  Sometimes I would just take the 25 minutes of silence to just think.

My thought that night was that it was nice to be wanted.  There is some comfort in knowing that the Shift Supervisor could call me with enough confidence to know that I would be able to come out on my own and fix a problem that was costing the company a large amount of money each hour the dumper was offline.  Some might think that I would be annoyed to be wakened in the middle of the night to go fix something at the plant.  That night, as most nights I was feeling honored.

That wasn’t always the case, and I’ll soon write a post about another call out in the middle of the night where Scott Hubbard and I wondered exactly why they called us… but that’s another story.

When I arrived at the plant, I rolled my car up to the speaker at the front gate and said, “Hello” with an arrogant English accent.  I don’t know why, but I always liked doing that.  I think it was Billy Epperson who answered back.  I told him I was here to work on the dumper.  He thanked me and opened the gate and I drove the 1/2 mile down the hill to the plant parking lot.  As I went over the hill, in the moonlight I could see the train up at the coal yard looking like a long silver snake.

I walked into the maintenance shop and grabbed a truck key off of the hook and drove around to the electric shop to pick up my hard hat and tool bucket.

This is an actual picture of my tool bucket

This is an actual picture of my tool bucket

I took the long way around to the coal yard since the train blocked the shortest route.  We had a tunnel on the west end of the coal yard that went under the tracks for just this occasion.

When I arrived at the dumper, Stanley Robbins explained that he had tried troubleshooting this problem himself, but he couldn’t find anything that would explain the strange behavior.  Since the last downsizing, we were all able to sort of mix our skills so that an operator could do simple electric tasks if they felt comfortable with it.  Stanley knew enough to fix your normal minor dumper issues.  This one was a little different.

Since I had been an electrician for the past 15 years at this point, I felt pretty confident that I would quickly find the problem and be heading back home soon.  So, I walked into the dumper switchgear where the dumper controls are found.  I asked Stanley to go turn on the power to the dumper so that I could watch the relays.  When the power was on, I began tracing the circuits looking for the point of failure.

The problem was intermittent, and when Stanley started the dumper back up, everything seemed to be working just fine.  Stanley explained that this was why they couldn’t use the dumper because they couldn’t be sure when it was going to malfunction.  They had even uncoupled the train and pulled it apart right where the positioner arm was so that I could see what was happening.

Using radios (walkie talkies), I asked Stanley to move the positioner arm up and down while I checked it.  He lowered it and raised it back up without any problem.  When he began lowering it the second time, it suddenly stopped halfway down.  Watching the controls, I could see that it indicated that it had come all the way down.  It would be this case that would tell the holding arm on the far side of the dumper to go back up, which is what happened when the train rolled back earlier that night.

Then the relays rattled like they were picking up and dropping out rapidly.  Then the problem cleared up again.  Somehow the positioner arm had thought it had come down on the car clamps when it was still up in the air.  That was not likely to happen because when something fails it usually doesn’t see what it’s supposed to see, not the other way around.  It doesn’t usually see something that isn’t there.

So, I had Stanley lower the positioner arm down so that it was level with the ground, so that I could check the connections to the electric eye that was on the positioner clamp that detected the train car clamp when it came down.  I couldn’t find any lose connections or anything that would explain it.

So I told Stanley that I was going to look up from under the car clamp to look at the electric eye.  So, I asked him to kill the power to the positioner so that it wouldn’t move while I was doing that and crush me like a bug.  Kneeling on the train track, I took my flashlight and looked up at the electric eye from under the car clamp, and this is what I saw:

A spider almost like this

A spider almost like this

This spider had built a spider web in front of the electric eye on the positioner and was sitting right in the middle causing the positioner to think it was down on the car clamp when it wasn’t.  Stanley was watching me from the window of the dumper control room when he saw me stand up quickly and look up at him with a big grin on my face.  I gave him a thumbs up.

You know the phrase, “Everyone has 10 minutes of fame….”  It indicates that some time in most people’s lives they are famous for a brief moment.  It may or may not define the rest of their life.  Well.  This was that spiders claim to fame.  This one spider had successfully stranded a coal train with 110 cars of coal.  A train crew, a coal yard operator, and one lone electrician that had traveled 30 miles to watch it act out it’s drama of catching gnats on it’s web being constantly watched by one large electric eye.

I did not drive home in silence that early morning.  I laughed out loud all the way home.  I still laugh to myself to this day when I think about this night.  Phrases like, “Isn’t life wonderful” comes to my mind.  Or “Even Spiders desire attention every now and then.”  Could there have been a better malfunction than to have a spider dancing in front of an electric eye out in the plains of Oklahoma saying, “Look at me!  Look at me!”  and by golly.  Someone did!  I’m just glad it was me.

Lifecycle of a Power Plant Lump of Coal

Originally posted August 16, 2013:

Fifty Percent of our electricity is derived from coal. Did you ever wonder what has to take place for that to happen? I thought I would walk through the lifecycle of a piece of coal to give you an idea. I will not start back when the it was still a tree in a prehistoric world where dinosaurs grew long necks to reach the branches. I will begin when the large scoop shovel digs it out of the ground and loads it onto a coal truck.

The coal is loaded onto trucks like these before it is dumped onto the train cars. This photo was found at http://www.gillettechamber.com/events/eventdetail.aspx?EventID=2827

The coal is loaded onto trucks like these before it is dumped onto the train cars. This photo was found at http://www.gillettechamber.com/events/eventdetail.aspx?EventID=2827

The coal for the power plant in North Central Oklahoma came from Wyoming. There were trains from the Black Thunder Mine and the Powder River Basin.

Coal Trains on their way to power plants

Coal Trains on their way to power plants

It’s a long ride for the lump of coal sitting in the coal train on it’s way to Oklahoma. Through Nebraska and Kansas. It’s possible for the coal to be visited by a different kind of traveler. One that we may call “A tramp.” Someone that catches a ride on a train without paying for the ticket.

One time a tramp (or a hobo, I don’t remember which), caught a ride on one of our coal trains. They forgot to wake up in time, and found their self following the lumps of coal on their next phase of the journey. You see. Once the coal reached the plant, one car at a time enters a building called the “Rotary Dumper”.

A rotary dumper much like the one that was at our Power Plant

A rotary dumper much like the one that was at our Power Plant

As each train car enters the dumper four clamps come done on the car and it rolls upside down dumping the coal into a bin below. Imagine being a tramp waking up just in time to find yourself falling into a bin full of coal. with a car full of coal dumping coal on top of you. One coal car contained 102 tons of coal (today they carry 130 tons). Today one train contains 13,300 tons of coal. This is over 26 million pounds of coal per train.

Miraculously, this passenger survived the fall and was able to call for help or someone saw him fall. He was quickly rescued and brought to safety. Needless to say, the tramp went from being penniless to being, “comfortable” very quickly. I don’t know that it made the news at the time. I think the electric company didn’t want it to become “viral” that they had dumped a hobo into a coal bin by accident. Well. They didn’t know what “going viral” meant at the time, but I’m sure they had some other phrase for it then.

Ok. Time for a Side Story:

Since I’m on the subject of someone catching a clandestine ride on a train, this is as good of a place as any to sneak in the tragic story of Mark Meeks. Well. I say it was tragic. When Mark told the story, he seemed rather proud of his experience. You see. Mark was a construction electrician. He hired on as a plant electrician in order to settle down, but in his heart I felt like he was always a construction electrician. That is, he didn’t mind moving on from place to place. Doing a job and then moving on.

Mark explained that when he was working at a construction job in Chicago where he worked for 2 years earning a ton of overtime, he figured that by the time he finished he would have saved up enough to buy a house and settle down. He was married and living in an apartment in Chicago. He didn’t spend much time at home as he was working 12 hour days at least 6 days each week. He figured that was ok, because when he was done, he would be set for life.

Unknown to him at the time, each morning when he woke up before the crack of dawn to go to work, his wife would drive to O’Hara airport and catch a plane to Dallas, Texas where she was having an affair with some guy. By the time Mark returned from work 14 hours later, she was back home. Each day, Mark was earning a ton of overtime, and his wife was burning it on airline tickets.

When the two years were over, Mark came home to his apartment to collect his wife and his things and go live in peace in some small town some where. That was when he learned that his wife had been having the affair and using all his money to do it. She was leaving him. Penniless.

Completely broke, Mark drifted around for a while. Finally one day he saw a train that was loaded down with wooden electric poles. Mark figured that wherever those poles were going, there was going to be work. So, he hopped on the train and traveled all the way from Minneapolis Minnesota riding in the cold, wedged between some wooden poles on one of the cars on the train.

The train finally arrived at its destination somewhere at a port in the Gulf of Mexico. I don’t remember if it was Mississippi or Louisiana. He watched as they unloaded the poles, waiting to see what jobs were going to be needed for whatever the poles were for. He watched as they took the large wooden poles and piled them up in the ocean. They were using them to build up the shoreline. There were no jobs.

It is when you have been beaten down to the point of breaking when you reach a very important point in your life. Do you give up, or do you pick yourself up and make something of yourself? Mark chose the latter. He was a natural fighter. He eventually ended up at our plant as contract help, and then was hired as a plant electrician.

End of side story.

Let’s follow the lump of coal after it is poured out of the coal train in the dumper…

The coal is fed onto a conveyor belt. Let’s call this Conveyor 1, (because that is what we called it in the plant). This has a choice to feed it onto belt 2 which leads up to the stack out tower, or it can feed the other way to where some day it was planned to add another conveyor with another stackout tower. This was going to go to a pile of coal for two other units that were never built.

Anyway, when the coal drops down on Conveyor 2, way under ground, it travels up to the ground level, and continues on its way up to the top of the stackout tower where it feeds onto Belt 3. Belt 3 is a short belt that is on an arm that swings out over the coal pile. The coal is fed onto the coal pile close to the stack out tower. I suppose it is called stack out, because the coal is stacked up next to the tower.

A view of the coalyard from the top of the Smoke Stack

A view of the coalyard from the top of the Smoke Stack. The tower with the conveyor running up to the top is the stack out tower. Belt 3 is the arm pointing to the right in this picture

Anyway, there are large dozers (bulldozers) and dirt movers that pickup the coal and spread it out to make room for more coal from more coal trains. As mentioned above. One train now carries 26 million pounds of coal.

Dirt Mover full of coal

Dirt Mover full of coal

the coal that is spread out on the coal pile has to stay packed down otherwise it would spontaneously combust. That is, it would catch on fire all by itself. Once coal on a coal pile catches on fire it is impossible to “reasonably” put out. You can spray all the water on it you want and it won’t go out. When a fire breaks out, you just have to drag the burning coal off of the pile and let it burn out.

In order to keep the coal from performing spontaneous combustion, the dirt movers kept it packed down. As long as the coal is packed tight, air can’t freely reach the buried coal, and it doesn’t catch fire. So, dirt movers were constantly driving back and forth on the coal pile to keep the coal well packed. Even on the picture of the coalyard above from the smoke stack, you can see two pieces of heavy equipment out on the coal pile traveling back and forth packing the coal.

Anyway, the next phase in the life of the lump of coal happens when it finds itself directly under the stack out tower, and it is fed down by a vibratory feeder onto a conveyor. In our plant, these belts were called, Belts 4, 5, 6 and 7. Belts 4 and 5 fed onto Belt 8 and belts 6 and 7 fed onto belt 9.

Belts 8 and 9 brought the coal up from under the coal pile to the top of the Crusher tower. In the picture above you can see that tower to the right of the stack out tower with the long belts coming from the bottom of the tower toward the plant. The crusher tower takes the large lumps of coal that can be the size of a baseball or a softball and crushes it down to the size of marbles and large gumballs.

Coal conveyor carrying coal to the coal silos from the coalyard

Coal conveyor carrying coal to the coal silos from the coalyard. This is the size of the coal after it has been crushed by the crusher

From the crusher tower the lump of coal which is now no more than a nugget of coal travels from the coal yard up to the plant on belts 10 and 11.

conveyor 10 and 11 are almost 1/2 mile long

conveyor 10 and 11 are almost 1/2 mile long

Up at the top of this belt in the distance you can see another tower. This tower is called the Transfer tower. Why? Well, because it transfers the coal to another set of belts, Belt 12 and 13. You can see them going up to the right to that tower in the middle between the two boilers.

The tower between the two boilers is called the Surge Bin tower. That basically means that there is a big bin there that can hold a good amount of coal to feed to either unit. At the bottom of the white part of the tower you can see that there is a section on each side. This is where the tripper galleries are located. There are two belts in each tripper, and two belts that feed to each tripper belt from the surge bin. So, just to keep counting, Belts 14 and 15 feed to unit one and belts 16 and 17 feed to unit 2 from the surge bin. then Belts 18 and 19 are the two tripper belts that dump coal into the 6 silos on unit one, while belts 20 and 21 feed the silos on unit 2.

Once in the Coal silos, the coal is through traveling on belts. The silos are positioned over things called bowl mills. The coal is fed from the silo into the bowl mill through something called a Gravimetric feeder, which is able to feed a specific amount of coal into the bowl mill. This is the point that basically decides how hot the boiler is going to be.

Once the coal leaves the gravimetric feeder and drops down to the bowl mill, it is bound for the boiler. The gravimetric feeder is tied right to the control room. When they need to raise load more than just a minimal amount, a control room operator increases the amount of coal being fed from these feeders in order to increase the flow of coal into the boiler….. I don’t know… maybe it’s more automatic than that now…. The computer probably does it these days.

When the nugget of coal falls into the bowl mill the long journey from the coal mine in Wyoming is almost complete. Its short life as a nugget is over and it is pulverized into powder. The powder is finer than flour. Another name for a bowl mill is “Pulverizer”. The coal comes from the Powder River Basin in Wyoming and just before it is consumed in Oklahoma it really does become powder.

Big rollers are used to crush the coal into fine particles. The pulverized coal his blown up pipes by the primary air fans and blown directly into the boiler where they burst into flames. A bright orange flame. The color reminds me of orange sherbet Ice cream.

The color of the fireball in the boiler

The color of the fireball in the boiler

At this point an incredible thing happens to the coal that so many years ago was a part of a tree or some other plant. The chemical process that trapped the carbon from the carbon dioxide millions of years earlier is reversed and the carbon is once again combined to the oxygen as it was many millennium ago. A burst of heat is released which had been trapped after a cooling effect below the tree as it sucked the carbon out of the environment way back then.

The heat is transferred to the boiler tubes that line the boiler. The tubes heat the water and turn it into steam. The steam shoots into the turbine that turns a generator that produces the electricity that enters every house in the country. The solar power from eons ago that allowed the tree to grow is being used today to power our world. What an amazing system.

To take this one step further, the carbon dioxide that is released into the atmosphere today is replenishing the lost carbon dioxide from many years ago. Back when plants could breathe freely. Back before the carbon dioxide level was depleted almost to the point of the extinction of plant life on this planet. Remember, what we look on as a pollutant and a poison, to a plant is a chance to grow. The Sahara desert used to be a thriving forest. Maybe it will be again some day.

So, there is the question of global warming. We humans are so short sighted sometimes. We want to keep everything the same way we found it when we were born. We try desperately to keep animals from becoming extinct. We don’t think about the bazillions (ok, so I exaggerate) of animals that were extinct long before man arrived. It is natural for extinction to occur. That is how things evolve. We are trying to keep a system the same when it has always been changing.

Years from now we may develop ways to harness the energy from the sun or even from the universe in ways that are unimaginable today. When that time arrives, let’s just hope that we remain good stewards of the world so that we are around to see it. I believe that the use of fossil fuels, (as odd as that may seem) is a major step in reviving our planet’s natural resources.

Comments from the previous repost:

twotiretirade  August 20, 2014

Glad Mark fought the good fight, still a sad story.


Antion August 21, 2014
Great read. I love knowing how things work. As I read the sad story of the traveling electrician, I kept wondering if she could have pulled that off in today’s world of air travel.


hiwaychristian August 22, 2014
when I went to the Christian College in Eugene Oregon, they forced me to take a course in biology at the University of Oregon. I willingly sat and listened to the mix of science and evolution. I admit their perspective was intriguing.
at the end of the class, the last day, the instructor asked each one of her students to tell how the class had affected their thinking.
each one gave the politically correct answer in a variety of form. all the while I sat joyfully waiting my turn.
my response hushed the class for a moment. (it’s been some decades ago so I have to paraphrase but let it be sufficient) “I’m impressed with all the material you’ve covered. it’s astounding to think of all the things that were. but for me this class has only glorified my God. because I realize that in his wisdom he created gasoline for my car.”
you’ve covered a lot of material in your post. and I’m impressed at your diligence to complete it. I thank God for His faithfulness that he has put into you. may He prosper your testimony for the glory of His Holy Son.
By His Grace
(please overlook the syntax errors in this reply it was generated on a mobile device)

Monty Hansen November 4, 2014

We processed several hobo’s through our coal system, & injured a few, but none ever got anything from the power company. I remember we would always worried about finding a chunk of scalp or something in the grating where the tripper car drops coal down into the silo. One especially memerable event was when a coal yard operator found a down vest jacket on the coal pile and bragged about how lucky he was to find this jacket, the size even fit, but the jacket did smell a little funny. yes it was ripped off the body of a hobo by the plow above conveyor one & shot out onto the coal pile by the stackout conveyor.

It was always unnerving to have a pullcord go down in the middle of the night deep down in the coal trestle, while the belts were shut down. You’d have to go down there alone, in the dark & reset the pull cords, so the belts could be started later when needed. You knew it wasn’t a trick because the whole crew had been up in the control room together eating dinner or something. You always wondered if you might run into a real hobo – or the ghost of one.

Power Plant Spider in the Eye

If you have been following my posts for very long, you may have the idea that I just like to write posts about spiders.  After writing two posts about Spider Wars (see posts:  “Power Plant Spider Wars and Bugs in the Basement” and “Power Plant Spider Wars II – The Phantom Menace“), another post about spiders just seems like a bit much.  Even though there is a spider in this story, another appropriate title could be something like “Another night in the Life of a Power Plant Electrician”.  Without further ado, here is the story.

Ninety nine times out of a hundred, when the phone rang in the middle of the night, it was the Power Plant in North Central Oklahoma calling.  I don’t remember a time when the Shift Supervisor on the other end of the phone wasn’t very polite.  They knew they were waking someone from their sleep to ask them to drive 30 miles out to the plant in the wee hours of the morning.

The Shift Supervisor, whether it was Joe Gallahar, Jim Padgett, Jack Maloy, or Gary Wright, they would all start out with something like, “Hey, sorry to wake you buddy…”.  After such an apologetic introduction, how could you be upset that your sleep had just been interrupted?  Then they would proceed to tell you why they needed your assistance.  For me, it was usually because the coal dumper had stopped working while a train was dumping their coal.  This meant that 110 cars tied to three or four engines was sitting idle unable to move.

Each car on the train would be dumped one at a time as it was pulled through the rotary dumper.  The process was automated so that the operator in the control room watching out of the window only had to push one switch to dump each car.

A rotary dumper much like the one that was at our Power Plant

A rotary dumper much like the one that was at our Power Plant

The train would move forward to the next car automatically as a large arm on a machine called a Positioner would come down on the coupling between the cars and pull the entire train forward to the next car.

The piece of equipment with the large wheels is the positioner  It can pull a coal train full of coal forward to precisely the proper position

The piece of equipment with the large wheels is the positioner It can pull a coal train full of coal forward to precisely the proper position

There were so many moving parts involved in positioning the car in place and rolling it over to dump the coal, that it was common for something to go wrong.  When that happened the entire process would come to a halt and the train would just have to sit there until someone came to fix it.  That was usually an electrician since the dumper and the positioner was all controlled by relays much like the elevator controls, only more complicated.

This particular night, Joe Gallahar had called me.  It seemed that there was an intermittent problem with the dumper that didn’t seem to make much sense and they couldn’t figure out why it was acting so strange.  One of the train cars had actually been damaged as the positioner arm would start coming up from the coupling to the point where the holding arm on the other end of the dumper had come up, then the positioner arm began going back down, causing the train to move on it’s own only to have the arm on the positioner scrape the side of the train car as it rolled backward uncontrolled.

Though it was less frequent, it was not so strange to have a train damaged by erratic dumper controls.  I have seen the side of a train car smashed in by the positioner arm when it decided to inappropriately come down.  This night, the problem was acting like that.  So, instead of damaging the train further, they decided to call me out to have a look at it.

I always had the philosophy when being called out in the middle of the night to be just as polite back to the Shift Supervisor when I answered the phone.  I had a Marketing professor at Oklahoma State University named Dr. Lee Manzer, who explained this one day.

Here is a short side story about Dr. Manzer —

Dr. Manzer told a story in class one day about how he was travelling home one day from a long and difficult trip where everything had gone wrong.  It was very late at night when he arrived at his house (which, incidentally was just down the street from my parent’s house), he was really beat.  He went into his bedroom and began preparing for bed.

About the time he was taking off his tie, his wife rolled over in bed and welcomed him home.  Then she said, “Oh, by the way.  I forgot to buy milk (or maybe it was ice cream).  Do you think you could run down to the store and buy some?”

Dr. Manzer explained his decision making process at that point like this:  “I could either go on a rant and tell my wife what a long and tiring day I had just had and now you are asking me to go buy milk? , and then I would go get the milk.  Or I could say, ‘Of course Dear.  I would be glad to go buy some milk.’  Either way, I was going to go buy the milk.  So, I could do it one of two ways.  I could complain about it or I could be positive.  I could either score points or lose them…. hmm…. Let’s see…. what did I do?  I said, ‘Of course Dear.'”

— End of the side story about Dr. Lee Manzer who by the way was a terrific Marketing Professor.  I understand he still teaches to this day.

So, when Joe Gallahar called me that night, and explained that the dumper was acting all erratic, Instead of saying “Yes Dear.”  as that wouldn’t have been appropriate, I told him, “No problem.  I’ll be there as soon as I can.”  My wife Kelly knew who was on the other end of the phone when she heard my answer.  She had heard it many times before.  I usually only had to say one word after hanging up the phone, “Dumper”, and she knew what that meant.

A Power Plant Electrician’s spouse knows that this is part of the job.  As I pulled on the jeans that I had laid out before I went to bed, Kelly would usually say something in her sleep like, “Be careful”.  I would give her a hug and tell her I’ll be back in a while, even though, sometimes I would be gone for two days working on the precipitator during a start up or some major catastrophe.  Usually, it was just a couple of hours before I came crawling back in bed.

This particular night I drove to work in silence with the window open so that the cool air would keep me awake.  Normally I had the radio on some rock station so that I would be singing along (in my terribly off-key singing voice) in order to stay awake.  Sometimes I would just take the 25 minutes of silence to just think.

My thought that night was that it was nice to be wanted.  There is some comfort in knowing that the Shift Supervisor could call me with enough confidence to know that I would be able to come out on my own and fix a problem that was costing the company a large amount of money each hour the dumper was offline.  Some might think that I would be annoyed to be wakened in the middle of the night to go fix something at the plant.  That night, as most nights I was feeling honored.

That wasn’t always the case, and I’ll soon write a post about another call out in the middle of the night where Scott Hubbard and I wondered exactly why they called us… but that’s another story.

When I arrived at the plant, I rolled my car up to the speaker at the front gate and said, “Hello” with an arrogant English accent.  I don’t know why, but I always liked doing that.  I think it was Billy Epperson who answered back.  I told him I was here to work on the dumper.  He thanked me and opened the gate and I drove the 1/2 mile down the hill to the plant parking lot.  As I went over hill, in the moonlight I could see the train up at the coal yard looking like a long silver snake.

I walked into the maintenance shop and grabbed a truck key off of the hook and drove around to the electric shop to pick up my hard hat and tool bucket.

This is an actual picture of my tool bucket

This is an actual picture of my tool bucket

I took the long way around to the coal yard since the train blocked the shortest route.  We had a tunnel on the west end of the coal yard that went under the tracks for just this occasion.

When I arrived at the dumper, Stanley Robbins explained that he had tried troubleshooting this problem himself, but he couldn’t find anything that would explain the strange behavior.  Since the last downsizing, we were all able to sort of mix our skills so that an operator could do simple electric tasks if they felt comfortable with it.  Stanley knew enough to fix your normal minor dumper issues.  This one was a little different.

Since I had been an electrician for the past 15 years at this point, I felt pretty confident that I would quickly find the problem and be heading back home soon.  So, I walked into the dumper switchgear where the dumper controls are found.  I asked Stanley to go turn on the power to the dumper so that I could watch the relays.  When the power was on, I began tracing the circuits looking for the point of failure.

The problem was intermittent, and when Stanley started the dumper back up, everything seemed to be working just fine.  Stanley explained that this was why they couldn’t use the dumper because they couldn’t be sure when it was going to malfunction.  They had even uncoupled the train and pulled it apart right where the positioner arm was so that I could see what was happening.

Using radios (walkie talkies), I asked Stanley to move the positioner arm up and down while I checked it.  He lowered it and raised it back up without any problem.  When he began lowering it the second time, it suddenly stopped halfway down.  Watching the controls, I could see that it indicated that it had come all the way down.  It would be this case that would tell the holding arm on the far side of the dumper to go back up, which is what happened when the train rolled back earlier that night.

Then the relays rattled like they were picking up and dropping out rapidly.  Then the problem cleared up again.  Somehow the positioner arm had thought it had come down on the car clamps when it was still up in the air.  That was not likely to happen because when something fails it usually doesn’t see what it’s supposed to see, not the other way around.  It doesn’t usually see something that isn’t there.

So, I had Stanley lower the positioner arm down so that it was level with the ground, so that I could check the connections to the electric eye that was on the positioner clamp that detected the train car clamp when it came down.  I couldn’t find any lose connections or anything that would explain it.

So I told Stanley that I was going to look up from under the car clamp to look at the electric eye.  So, I asked him to kill the power to the positioner so that it wouldn’t move while I was doing that and crush me like a bug.  Kneeling on the train track, I took my flashlight and looked up at the electric eye from under the car clamp, and this is what I saw:

A spider almost like this

A spider almost like this

This spider had built a spider web in front of the electric eye on the positioner and was sitting right in the middle causing the positioner to think it was down on the car clamp when it wasn’t.  Stanley was watching me from the window of the dumper control room when he saw me stand up quickly and look up at him with a big grin on my face.  I gave him a thumbs up.

You know the phrase, “Everyone has 10 minutes of fame….”  It indicates that some time in most people’s lives they are famous for a brief moment.  It may or may not define the rest of their life.  Well.  This was that spiders claim to fame.  This one spider had successfully stranded a coal train with 110 cars of coal.  A train crew, a coal yard operator, and one lone electrician that had traveled 30 miles to watch it act out it’s drama of catching gnats on it’s web being constantly watched by one large electric eye.

I did not drive home in silence that early morning.  I laughed out loud all the way home.  I still laugh to myself to this day when I think about this night.  Phrases like, “Isn’t life wonderful” comes to my mind.  Or “Even Spiders desire attention every now and then.”  Could there have been a better malfunction than to have a spider dancing in front of an electric eye out in the plains of Oklahoma saying, “Look at me!  Look at me!”  and by golly.  Someone did!  I’m just glad it was me.

Lifecycle of a Power Plant Lump of Coal — Repost

Originally posted August 16, 2013:

Fifty Percent of our electricity is derived from coal.  Did you ever wonder what has to take place for that to happen?  I thought I would walk through the lifecycle of a piece of coal  to give you an idea.  I will not start back when the it was still a tree in a prehistoric world where dinosaurs grew long necks to reach the branches.  I will begin when the large scoop shovel digs it out of the ground and loads it onto a coal truck.

The coal is loaded onto trucks like these before it is dumped onto the train cars.  This photo was found at http://www.gillettechamber.com/events/eventdetail.aspx?EventID=2827

The coal is loaded onto trucks like these before it is dumped onto the train cars. This photo was found at http://www.gillettechamber.com/events/eventdetail.aspx?EventID=2827

The coal for the power plant in North Central Oklahoma came from Wyoming.  There were trains from the Black Thunder Mine and the Powder River Basin.

Coal Trains on their way to power plants

Coal Trains on their way to power plants

It’s a long ride for the lump of coal sitting in the coal train on it’s way to Oklahoma.  Through Nebraska and Kansas.  It’s possible for the coal to be visited by a different kind of traveler.  One that we may call “A tramp.”  Someone that catches a ride on a train without paying for the ticket.

One time a tramp (or a hobo, I don’t remember which), caught a ride on one of our coal trains.  They forgot to wake up in time, and found their self following the lumps of coal on their next phase of the journey.  You see.  Once the coal reached the plant, one car at a time enters a building called the “Rotary Dumper”.

A rotary dumper much like the one that was at our Power Plant

A rotary dumper much like the one that was at our Power Plant

As each train car enters the dumper four clamps come done on the car and it rolls upside down dumping the coal into a bin below.  Imagine being a tramp waking up just in time to find yourself falling into a bin full of coal. with a car full of coal dumping coal on top of you.  One coal car contained 102 tons of coal (today they carry 130 tons).  Today one train contains 13,300 tons of coal.  This is over 26 million pounds of coal per train.

Miraculously, this passenger survived the fall and was able to call for help or someone saw them fall.  He was quickly rescued and brought to safety.  Needless to say, the tramp went from being penniless to being, “comfortable” very quickly.  I don’t know that it made the news at the time.  I think the electric company didn’t want it to become “viral” that they had dumped a hobo into a coal bin by accident.  Well.  They didn’t know what “going viral” meant at the time, but I’m sure they had some other phrase for it then.

Ok.  Time for a Side Story:

Since I’m on the subject of someone catching a clandestine ride on a train, this is as good of a place as any to sneak in the tragic story of Mark Meeks.  Well.  I say it was tragic.  When Mark told the story, he seemed rather proud of his experience.  You see.  Mark was a construction electrician.  He hired on as a plant electrician in order to settle down, but in his heart I felt like he was always a construction electrician.  That is, he didn’t mind moving on from place to place.  Doing a job and then moving on.

Mark explained that when he was working at a construction job in Chicago where he worked for 2 years earning a ton of overtime, he figured that by the time he finished he would have saved up enough to buy a house and settle down.  He was married and living in an apartment in Chicago.  He didn’t spend much time at home as he was working 12 hour days at least 6 days each week.  He figured that was ok, because when he was done, he would be set for life.

Unknown to him at the time, each morning when he woke up before the crack of dawn to go to work, his wife would drive to O’Hara airport and catch a plane to Dallas, Texas where she was having an affair with some guy.  By the time Mark returned from work 14 hours later, she was back home.  Each day, Mark was earning a ton of overtime, and his wife was burning it on airline tickets.

When the two years were over, Mark came home to his apartment to collect his wife and his things and go live in peace in some small town some where.  That was when he learned that his wife had been having the affair and using all his money to do it.  She was leaving him.  Penniless.

Completely broke, Mark drifted around for a while.  Finally one day he saw a train that was loaded down with wooden electric poles.  Mark figured that wherever those poles were going, there was going to be work.  So, he hopped on the train and traveled all the way from Minneapolis Minnesota riding in the cold, wedged between some wooden poles on one of the cars on the train.

The train finally arrived at its destination somewhere at a port in the Gulf of Mexico.  I don’t remember if it was Mississippi or Louisiana.  He watched as they unloaded the poles, waiting to see what jobs were going to be needed for whatever the poles were for.  He watched as they took the large wooden poles and piled them up in the ocean.  They were using them to build up the shoreline.  There were no jobs.

It is when you have been beaten down to the point of breaking when you reach a very important point in your life.  Do you give up, or do you pick yourself up and make something of yourself?  Mark chose the latter.  He was a natural fighter.  He eventually ended up at our plant as contract help, and then was hired as a plant electrician.

End of side story.

Let’s follow the lump of coal after it is poured out of the coal train in the dumper…

The coal is fed onto a conveyor belt.  Let’s call this Conveyor 1, (because that is what we called it in the plant).  This has a choice to feed it onto belt 2 which leads up to the stack out tower, or it can feed the other way to where some day it was planned to add another conveyor with another stackout tower.  This was going to go to a pile of coal for two other units that were never built.

Anyway, when the coal drops down on Conveyor 2, way under ground, it travels up to the ground level, and continues on its way up to the top of the stackout tower where it feeds onto Belt 3.  Belt 3 is a short belt that is on an arm that swings out over the coal pile.  The coal is fed onto the coal pile close to the stack out tower.  I suppose it is called stack out, because the coal is stacked up next to the tower.

A view of the coalyard from the top of the Smoke Stack

A view of the coalyard from the top of the Smoke Stack. The tower with the conveyor running up to the top is the stack out tower. Belt 3 is the arm pointing to the right in this picture

Anyway, there are large dozers (bulldozers) and dirt movers that pickup the coal and spread it out to make room for more coal from more coal trains.  As mentioned above.  One train now carries 26 million pounds of coal.

Dirt Mover full of coal

Dirt Mover full of coal

the  coal that is spread out on the coal pile has to stay packed down otherwise it would spontaneously combust.  That is, it would catch on fire all by itself.  Once coal on a coal pile catches on fire it is impossible to “reasonably” put out.  You can spray all the water on it you want and it won’t go out.  When a file breaks out, you just have to drag the burning coal off of the pile and let it burn out.

In order to keep the coal from performing spontaneous combustion, the dirt movers kept it packed down.  As long as the coal is packed tight, air can’t freely reach the buried coal, and it doesn’t catch fire.  So, dirt movers were constantly driving back and forth on the coal pile to keep the coal well packed.  Even on the picture of the coalyard above from the smoke stack, you can see two pieces of heavy equipment out on the coal pile traveling back and forth packing the coal.

Anyway, the next phase in the life of the lump of coal happens when it finds itself directly under the stack out tower, and it is fed down by a vibratory feeder onto a conveyor.  In our plant, these belts were called, Belts 4, 5, 6 and 7.  Belts 4 and 5 fed onto Belt 8 and belts 6 and 7 fed onto belt 9.

Belts 8 and 9 brought the coal up from under the coal pile to the top of the Crusher tower.  In the picture above you can see that tower to the right of the stack out tower with the long belts coming from the bottom of the tower toward the plant.  The crusher tower takes the large lumps of coal that can be the size of a baseball or a softball and crushes it down to the size of marbles and large gumballs.

Coal conveyor carrying coal to the coal silos from the coalyard

Coal conveyor carrying coal to the coal silos from the coalyard.  This is the size of the coal after it has been crushed by the crusher

From the crusher tower the lump of coal which is now no more than a nugget of coal travels from the coal yard up to the plant on belts 10 and 11.

conveyor 10 and 11 are almost 1/2 mile long

conveyor 10 and 11 are almost 1/2 mile long

Up at the top of this belt in the distance you can see another tower.  This tower is called the Transfer tower.  Why?  Well, because it transfers the coal to another set of belts, Belt 12 and 13.  You can see them going up to the right to that tower in the middle between the two boilers.

The tower between the two boilers is called the Surge Bin tower.  That basically means that there is a big bin there that can hold a good amount of coal to feed to either unit.  At the bottom of the white part of the tower you can see that there is a section on each side.  This is where the tripper galleries are located.  There are two belts in each tripper, and two belts that feed to each tripper belt from the surge bin.  So, just to keep counting, Belts 14 and 15 feed to unit one and belts 16 and 17 feed to unit 2 from the surge bin.  then Belts 18 and 19 are the two tripper belts that dump coal into the 6 silos on unit one, while belts 20 and 21 feed the silos on unit 2.

Once in the Coal silos, the coal is through traveling on belts.  The silos are positioned over things called bowl mills.  The coal is fed from the silo into the bowl mill through something called a Gravimetric feeder, which is able to feed a specific amount of coal into the bowl mill.  This is the point that basically decides how hot the boiler is going to be.

Once the coal leaves the gravimetric feeder and drops down to the bowl mill, it is bound for the boiler.  The gravimetric feeder is tied right to the control room.  When they need to raise load more than just a minimal amount, a control room operator increases the amount of coal being fed from these feeders in order to increase the flow of coal into the boiler…..  I don’t know… maybe it’s more automatic than that now….  The computer probably does it these days.

When the nugget of coal falls into the bowl mill the long journey from the coal mine in Wyoming is almost complete.  Its short life as a nugget is over and it is pulverized into powder.  The powder is finer than flour.  Another name for a bowl mill is “Pulverizer”.  The coal comes from the Powder River Basin in Wyoming and just before it is consumed in Oklahoma it really does become powder.

Big rollers are used to crush the coal into fine particles.  The pulverized coal his blown up pipes by the primary air fans and blown directly into the boiler where they burst into flames.  A bright orange flame.  The color reminds me of orange sherbet Ice cream.

The color of the fireball in the boiler

The color of the fireball in the boiler

At this point an incredible thing happens to the coal that so many years ago was a part of a tree or some other plant.  The chemical process that trapped the carbon from the carbon dioxide millions of years earlier is reversed and the carbon is once again combined to the oxygen as it was many millennium ago. A burst of heat is released which had been trapped after a cooling effect below the tree as it sucked the carbon out of the environment way back then.

The heat is transferred to the boiler tubes that line the boiler.  The tubes heat the water and turn it into steam.  The steam shoots into the turbine that turns a generator that produces the electricity that enters every house in the country.  The solar power from eons ago that allowed the tree to grow is being used today to power our world.  What an amazing system.

To take this one step further, the carbon dioxide that is released into the atmosphere today is replenishing the lost carbon dioxide from many years ago.  Back when plants could breathe freely.  Back before the carbon dioxide level was depleted almost to the point of the extinction of plant life on this planet.  Remember, what we look on as a pollutant and a poison, to a plant is a chance to grow.  The Sahara desert used to be a thriving forest.  Maybe it will be again some day.

So, there is the question of global warming.  We humans are so short sighted sometimes.  We want to keep everything the same way we found it when we were born.  We try desperately to keep animals from becoming extinct.   We don’t think about the bazillions (ok, so I exaggerate) of animals that were extinct long before man arrived.  It is natural for extinction to occur.  That is how things evolve.  We are trying to keep a system the same when it has always been changing.

Years from now we may develop ways to harness the energy from the sun or even from the universe in ways that are unimaginable today.  When that time arrives, let’s just hope that we remain good stewards of the world so that we are around to see it.  I believe that the use of fossil fuels, (as odd as that may seem) is a major step in reviving our planet’s natural resources.

Lifecycle of a Power Plant Lump of Coal

Fifty Percent of our electricity is derived from coal.  Did you ever wonder what has to take place for that to happen?  I thought I would walk through the lifecycle of a piece of coal  to give you an idea.  I will not start back when the it was still a tree in a prehistoric world where dinosaurs grew long necks to reach the branches.  I will begin when the large scoop shovel digs it out of the ground and loads it onto a coal truck.

The coal is loaded onto trucks like these before it is dumped onto the train cars.  This photo was found at http://www.gillettechamber.com/events/eventdetail.aspx?EventID=2827

The coal is loaded onto trucks like these before it is dumped onto the train cars. This photo was found at http://www.gillettechamber.com/events/eventdetail.aspx?EventID=2827

The coal for the power plant in North Central Oklahoma came from Wyoming.  There were trains from the Black Thunder Mine and the Powder River Basin.

Coal Trains on their way to power plants

Coal Trains on their way to power plants

It’s a long ride for the lump of coal sitting in the coal train on it’s way to Oklahoma.  Through Nebraska and Kansas.  It’s possible for the coal to be visited by a different kind of traveler.  One that we may call “A tramp.”  Someone that catches a ride on a train without paying for the ticket.

One time a tramp (or a hobo, I don’t remember which), caught a ride on one of our coal trains.  They forgot to wake up in time, and found their self following the lumps of coal on their next phase of the journey.  You see.  Once the coal reached the plant, one car at a time enters a building called the “Rotary Dumper”.

A rotary dumper much like the one that was at our Power Plant

A rotary dumper much like the one that was at our Power Plant

As each train car enters the dumper four clamps come done on the car and it rolls upside down dumping the coal into a bin below.  Imagine being a tramp waking up just in time to find yourself falling into a bin full of coal. with a car full of coal dumping coal on top of you.  One coal car contained 102 tons of coal (today they carry 130 tons).  Today one train contains 13,300 tons of coal.  This is over 26 million pounds of coal per train.

Miraculously, this passenger survived the fall and was able to call for help or someone saw them fall.  He was quickly rescued and brought to safety.  Needless to say, the tramp went from being penniless to being, “comfortable” very quickly.  I don’t know that it made the news at the time.  I think the electric company didn’t want it to become “viral” that they had dumped a hobo into a coal bin by accident.  Well.  They didn’t know what “going viral” meant at the time, but I’m sure they had some other phrase for it then.

Ok.  Time for a Side Story:

Since I’m on the subject of someone catching a clandestine ride on a train, this is as good of a place as any to sneak in the tragic story of Mark Meeks.  Well.  I say it was tragic.  When Mark told the story, he seemed rather proud of his experience.  You see.  Mark was a construction electrician.  He hired on as a plant electrician in order to settle down, but in his heart I felt like he was always a construction electrician.  That is, he didn’t mind moving on from place to place.  Doing a job and then moving on.

Mark explained that when he was working at a construction job in Chicago where he worked for 2 years earning a ton of overtime, he figured that by the time he finished he would have saved up enough to buy a house and settle down.  He was married and living in an apartment in Chicago.  He didn’t spend much time at home as he was working 12 hour days at least 6 days each week.  He figured that was ok, because when he was done, he would be set for life.

Unknown to him at the time, each morning when he woke up before the crack of dawn to go to work, his wife would drive to O’Hara airport and catch a plane to Dallas, Texas where she was having an affair with some guy.  By the time Mark returned from work 14 hours later, she was back home.  Each day, Mark was earning a ton of overtime, and his wife was burning it on airline tickets.

When the two years were over, Mark came home to his apartment to collect his wife and his things and go live in peace in some small town some where.  That was when he learned that his wife had been having the affair and using all his money to do it.  She was leaving him.  Penniless.

Completely broke, Mark drifted around for a while.  Finally one day he saw a train that was loaded down with wooden electric poles.  Mark figured that wherever those poles were going, there was going to be work.  So, he hopped on the train and traveled all the way from Minneapolis Minnesota riding in the cold, wedged between some wooden poles on one of the cars on the train.

The train finally arrived at its destination somewhere at a port in the Gulf of Mexico.  I don’t remember if it was Mississippi or Louisiana.  He watched as they unloaded the poles, waiting to see what jobs were going to be needed for whatever the poles were for.  He watched as they took the large wooden poles and piled them up in the ocean.  They were using them to build up the shoreline.  There were no jobs.

It is when you have been beaten down to the point of breaking when you reach a very important point in your life.  Do you give up, or do you pick yourself up and make something of yourself?  Mark chose the latter.  He was a natural fighter.  He eventually ended up at our plant as contract help, and then was hired as a plant electrician.

End of side story.

Let’s follow the lump of coal after it is poured out of the coal train in the dumper…

The coal is fed onto a conveyor belt.  Let’s call this Conveyor 1, (because that is what we called it in the plant).  This has a choice to feed it onto belt 2 which leads up to the stack out tower, or it can feed the other way to where some day it was planned to add another conveyor with another stackout tower.  This was going to go to a pile of coal for two other units that were never built.

Anyway, when the coal drops down on Conveyor 2, way under ground, it travels up to the ground level, and continues on its way up to the top of the stackout tower where it feeds onto Belt 3.  Belt 3 is a short belt that is on an arm that swings out over the coal pile.  The coal is fed onto the coal pile close to the stack out tower.  I suppose it is called stack out, because the coal is stacked up next to the tower.

A view of the coalyard from the top of the Smoke Stack

A view of the coalyard from the top of the Smoke Stack. The tower with the conveyor running up to the top is the stack out tower. Belt 3 is the arm pointing to the right in this picture

Anyway, there are large dozers (bulldozers) and dirt movers that pickup the coal and spread it out to make room for more coal from more coal trains.  As mentioned above.  One train now carries 26 million pounds of coal.

Dirt Mover full of coal

Dirt Mover full of coal

the  coal that is spread out on the coal pile has to stay packed down otherwise it would spontaneously combust.  That is, it would catch on fire all by itself.  Once coal on a coal pile catches on fire it is impossible to “reasonably” put out.  You can spray all the water on it you want and it won’t go out.  When a file breaks out, you just have to drag the burning coal off of the pile and let it burn out.

In order to keep the coal from performing spontaneous combustion, the dirt movers kept it packed down.  As long as the coal is packed tight, air can’t freely reach the buried coal, and it doesn’t catch fire.  So, dirt movers were constantly driving back and forth on the coal pile to keep the coal well packed.  Even on the picture of the coalyard above from the smoke stack, you can see two pieces of heavy equipment out on the coal pile traveling back and forth packing the coal.

Anyway, the next phase in the life of the lump of coal happens when it finds itself directly under the stack out tower, and it is fed down by a vibratory feeder onto a conveyor.  In our plant, these belts were called, Belts 4, 5, 6 and 7.  Belts 4 and 5 fed onto Belt 8 and belts 6 and 7 fed onto belt 9.

Belts 8 and 9 brought the coal up from under the coal pile to the top of the Crusher tower.  In the picture above you can see that tower to the right of the stack out tower with the long belts coming from the bottom of the tower toward the plant.  The crusher tower takes the large lumps of coal that can be the size of a baseball or a softball and crushes it down to the size of marbles and large gumballs.

Coal conveyor carrying coal to the coal silos from the coalyard

Coal conveyor carrying coal to the coal silos from the coalyard.  This is the size of the coal after it has been crushed by the crusher

From the crusher tower the lump of coal which is now no more than a nugget of coal travels from the coal yard up to the plant on belts 10 and 11.

conveyor 10 and 11 are almost 1/2 mile long

conveyor 10 and 11 are almost 1/2 mile long

Up at the top of this belt in the distance you can see another tower.  This tower is called the Transfer tower.  Why?  Well, because it transfers the coal to another set of belts, Belt 12 and 13.  You can see them going up to the right to that tower in the middle between the two boilers.

The tower between the two boilers is called the Surge Bin tower.  That basically means that there is a big bin there that can hold a good amount of coal to feed to either unit.  At the bottom of the white part of the tower you can see that there is a section on each side.  This is where the tripper galleries are located.  There are two belts in each tripper, and two belts that feed to each tripper belt from the surge bin.  So, just to keep counting, Belts 14 and 15 feed to unit one and belts 16 and 17 feed to unit 2 from the surge bin.  then Belts 18 and 19 are the two tripper belts that dump coal into the 6 silos on unit one, while belts 20 and 21 feed the silos on unit 2.

Once in the Coal silos, the coal is through traveling on belts.  The silos are positioned over things called bowl mills.  The coal is fed from the silo into the bowl mill through something called a Gravimetric feeder, which is able to feed a specific amount of coal into the bowl mill.  This is the point that basically decides how hot the boiler is going to be.

Once the coal leaves the gravimetric feeder and drops down to the bowl mill, it is bound for the boiler.  The gravimetric feeder is tied right to the control room.  When they need to raise load more than just a minimal amount, a control room operator increases the amount of coal being fed from these feeders in order to increase the flow of coal into the boiler…..  I don’t know… maybe it’s more automatic than that now….  The computer probably does it these days.

When the nugget of coal falls into the bowl mill the long journey from the coal mine in Wyoming is almost complete.  Its short life as a nugget is over and it is pulverized into powder.  The powder is finer than flour.  Another name for a bowl mill is “Pulverizer”.  The coal comes from the Powder River Basin in Wyoming and just before it is consumed in Oklahoma it really does become powder.

Big rollers are used to crush the coal into fine particles.  The pulverized coal his blown up pipes by the primary air fans and blown directly into the boiler where they burst into flames.  A bright orange flame.  The color reminds me of orange sherbet Ice cream.

The color of the fireball in the boiler

The color of the fireball in the boiler

At this point an incredible thing happens to the coal that so many years ago was a part of a tree or some other plant.  The chemical process that trapped the carbon from the carbon dioxide millions of years earlier is reversed and the carbon is once again combined to the oxygen as it was many millennium ago. A burst of heat is released which had been trapped after a cooling effect below the tree as it sucked the carbon out of the environment way back then.

The heat is transferred to the boiler tubes that line the boiler.  The tubes heat the water and turn it into steam.  The steam shoots into the turbine that turns a generator that produces the electricity that enters every house in the country.  The solar power from eons ago that allowed the tree to grow is being used today to power our world.  What an amazing system.

To take this one step further, the carbon dioxide that is released into the atmosphere today is replenishing the lost carbon dioxide from many years ago.  Back when plants could breathe freely.  Back before the carbon dioxide level was depleted almost to the point of the extinction of plant life on this planet.  Remember, what we look on as a pollutant and a poison, to a plant is a chance to grow.  The Sahara desert used to be a thriving forest.  Maybe it will be again some day.

So, there is the question of global warming.  We humans are so short sighted sometimes.  We want to keep everything the same way we found it when we were born.  We try desperately to keep animals from becoming extinct.   We don’t think about the bazillions (ok, so I exaggerate) of animals that were extinct long before man arrived.  It is natural for extinction to occur.  That is how things evolve.  We are trying to keep a system the same when it has always been changing.

Years from now we may develop ways to harness the energy from the sun or even from the universe in ways that are unimaginable today.  When that time arrives, let’s just hope that we remain good stewards of the world so that we are around to see it.  I believe that the use of fossil fuels, (as odd as that may seem) is a major step in reviving our planet’s natural resources.