Tag Archives: a team leader

Doing Dew Point Tests and Lowering Expectations

There were times when I was working at the Coal-Fired Power Plant in North Central Oklahoma when I wondered if there was anything that we couldn’t do.  Surrounded by True Power Plant Men I found that when we were facing a seemingly impossible task, a Power Plant Man would come up with an extremely creative solution to the problem.  One such example was during the “We’ve Got The Power” program.  I talked about this program in an early post called “Power Plant We’ve Got the Power Program” so I won’t go into detail here about the program itself.  I will just say that we broke out into teams to find creative ways to operate more efficiently, and to cut costs.

I was a team leader of our team, and looking back I must have had two criteria in mind when I picked the team members that would be on my team.  The first would have been that they were True Power Plant Men (and woman) with a higher than average intelligence.  The second criteria would have been that they were friends of mine.  I say this, because everyone on my team fit the bill.

During out team meetings, Terry Blevins would often say some bombastic statement that the average person may be inclined to dismiss immediately as being absurd.  I say that because I remember more than once thinking that what Terry had just said wouldn’t amount to much.  As it turned out, our biggest money saving ideas were those truly bombastic statements that Terry was making.  One such idea had to do with the heaters on the precipitators that kept the hoppers and the insulators on the roof too hot to collect moisture.

The Precipitator is a very large box that takes the ash out of the exhaust before it goes out of the smoke stack (how many times have I made that statement in the last two years?).  Anyway, the exhaust from the boiler after the coal has been turned to ash in the fireball in the boiler contains a large amount of moisture.   The last thing you want to happen is for the temperature of the flue gas to fall below the dew point.  When that happens, moisture collects on the structure in a form of… well…  of Acid Rain.  Basically eating away the precipitator and the duct work from the inside.

Somewhere along the line, it had been determined that the dewpoint of the flue gas was not higher than 250 degrees.  So, as long as the structure was at least 250 degrees, no moisture would be collected.    Four heaters were mounted on each of the 84 hoppers (on each of the two precipitators) and heaters were mounted on the roof around each of the insulators that held up the wire racks on both ends.

When Terry walked into the office to attend one of our first “We’ve Got The Power” team meetings, he said, I think we could save a lot of money if we did something about the heaters on the precipitator. —  He may remember being greeted with blank stares (at least from me).  Um.  Ok.  Heaters on the precipitator.  I knew they were everywhere, but I never gave them much thought.

I think Terry could tell right away that I hadn’t taken his idea seriously.  I don’t know.  Maybe he was bothered by the sound of my eyeballs rolling around in circles as if someone has conked me on the head.  So, he explained his idea further.  He pointed out that the roof heaters on just one of the precipitators used about 211 kilowatt-hours and the hopper heaters used about 345 kilowatt-hours.  Together it more than half a Megawatt of power.  — This definitely caught our attention.  That meant that between both of the Precipitators (since we had two boilers at our plant), we could possibly save over a Megawatt of electricity every hour we could shut down the heaters.

The plant has a similar electrostatic precipitator, only it is twice as long

The plant has a similar electrostatic precipitator, only ours is twice as long

After discussing all the aspects of the idea, we decided that in order for the idea to have any merit, we had to know if the dew point really was around 250 degrees, or was it possibly a lot lower.  250 degrees seemed high to begin with since the boiling point of water is 212 degrees.  If lower, then we could have a workable idea.  Originally, I wanted to tackle the task of finding the dew point.  So, I went about it in a Science Experiment sort of way.

I figured that if we were able to lower the temperature of the flue gas to a known temperature below the dewpoint, and by knowing the volume of the gas, and the amount of liquid we could condense out of it, we could determine (possibly) the dew point.  So, I brought my Graham Condenser to work, and Scott Hubbard and I went up to the 250 foot landing on the smoke stack with the intent of sucking a known amount of exhaust from the smoke stack while the unit was at full load.

Scott Hubbard

Scott Hubbard

We would run it through the condenser while running cool water through it to lower the temperature.

The Exact Graham Condenser used in our experiment Spring 1990

The Exact Graham Condenser used in our experiment Spring 1990 (and that’s my hairy hand in this selfie)

I could measure the output of the vacuum pump by filling up an inverted Erlemeyer flask with water and then letting the flue gas displace the water.  — I always loved doing experiments like this in the 9th grade science glass with Mr. Godfrey our Physical Science Teacher (Donna Westhoff, who may sometimes read this blog was in my class and sat right behind me).

An Erlenmeyer Flask (from Google Images, not from my Chemistry Lab)

An Erlenmeyer Flask (from Google Images, not from my Chemistry Lab)

Ok.  Side Story, since I mentioned Donna Westhoff from the 9th grade 1974-75 school year.

I knew that Donna’s father was a fire fighter, because one day during a special outing when we were with a group of bicycling Junior High School students and a teacher, we stopped at Donna Westoff’s house to get a drink of water.  On the walls in her house were different types of fire fighting treasures.  Donna explained that her father was a fire fighter…  That was the Spring of 1975 in Columbia, Missouri

Fast forward 16 years later (1991) at the Power Plant in the middle of nowhere in North Central Oklahoma.  Just about a year after the story I’m telling now…. I left the logic room and went to catch the elevator to the Control room.  When the doors opened, Tony Mena was in there with a bunch of college age students giving them a tour of the plant.  I entered the elevator and turned around to face the door as it closed.

As I was standing there, I suddenly became aware that the person standing next to me was staring right at me.  So, I turned to see who it was.  Standing next to me was someone that looked very familiar wearing a big grin as if she knew who I was.  I recognized her, and while my mind was going through filing cabinets of memories trying to index this particular person, I asked her, “Don’t I know you?”  She shook her head and said, “I’m Donna Westhoff!”

A High School picture of Donna Westhoff  who is on the Lower Left

A High School picture of Donna Westhoff who is on the Lower Left

As the elevator door opened and we stepped out, Donna and I began talking about what we were both doing there.  She was surprised to find that I had become an electrician at a power plant instead of some kind of scientist in a lab somewhere.  Donna was going to school in Stillwater where one of the best Fire Fighting Schools in the country is found.  Following in her father’s footsteps, I thought.  After a while I could tell that Tony was getting a little perturbed that the wisdom he was imparting about the fire protection system on the Turbine Generator wasn’t being absorbed by Donna, so I cut our conversation short.  It turned out that a very good friend of hers lived just two houses from where we lived, and her friend’s mother was my landlord.  Peggy Pickens.

Ok.  End of the side story, and another example of how I occasionally run into friends from my childhood in the most unexpected places (see the post:  “Relay Tests and Radio Quizzes with Ben Davis“).

So.  Scott Hubbard and I tried using the Graham Condenser and the Erlenmeyer Flask, but we quickly found out that this wasn’t big enough, to capture a large enough quantity.  So, we increased the size of the condenser by winding a garden hose around inside of a water bucket and filling it with ice.  Then we captured all the water that condensed in the hose.

A 5 gallon water bucket we used as our condenser with a garden hose and ice

A 5 gallon water bucket we used as our condenser with a garden hose and ice

When it finally came down to it.  Even though it was fun trying to do this experiment halfway up the 500 foot smoke stack, I never was able to figure out how to calculate the dew point given the data I had collected.

That’s when we decided to look at dew point sensors in the parts catalogs.  If we could stick a probe down into the precipitator and measure the dew point directly in the flue gas, that would be best.  After looking at a few in the catalog, Terry Blevins said he thought he could make one.  So, he went to work.

Terry Blevins

Terry Blevins

The next day he came in with an inch and a half conduit with hoses hanging out the back and a homemade sensor on the other end.  I won’t go into detail how the sensor was built because some day Terry may want to patent this thing because, as it turned out, it was so sensitive that it could detect my breathe from about a foot away.  If I breathed out of my mouth toward the sensor, it would detect the moisture in my breath.  This was perfect!

We went to work on the roof of the precipitator sticking the probe down into different sections of the precipitator.  It not only measured the moisture, it also had thermocouples on it that we used to accurately measure the temperature of the sensor as we varied the temperature by blowing cold air through the conduit using the same ice bucket and hose from before.

I could go into a lot of detail about how we performed our experiments, but it would only excite me and bore you.  So, let me just say that we came up with two very important results.  First of all, at full load when the humidity outside was at 100% the dew point was around 150 degrees!  A full 100 degrees below what the plant had originally assumed.  This was very important, because a lot of energy was spent trying to keep the flue gas above 250 degrees, and just by lowering it down to 210 degrees, still a safe amount above the dew point, that extra energy could be used to create electricity.

The second thing that we discovered was that the middle sections of the precipitator was a lot cooler inside than the outer fields.  We realized that this was caused by the air preheater coils that rotated between the flue gas and the Primary Air intake duct.  This took the last amount of heat safely possible from the exhaust and transferred it to the air going into the boiler so that it was already hot when it was used to burn the coal.  Because of the way the air preheater coils rotated, the part of the duct toward the middle of the precipitator was a lot cooler than the air on the outside.

Diagram of a boiler

Diagram of a boiler.  See the Air Preheater?  Flue Gas on one side and ambient air on the other

Lower temperatures in the precipitator increased the performance, so we decided that if we could mix the air around as it was going into the precipitator so that the outer edges were cooler, then it would increase the overall performance.  One suggestion was to put a mobile home in the duct work because in Oklahoma it was a known fact that mobile homes attracted tornadoes and it would probably cause a tornadic reaction that would mix up the flue gases.  — We just couldn’t figure out how to convince management to put a mobile home in the duct between the economizer and the precipitator.

Thanks to Terry’s handy dandy Dew Point Sensor, we were able to prove that the hopper and roof heaters could be lowered to where we set the thermostat at 180 degrees.  At that setting the heaters that used to always run at 250 degrees would remain off anytime the ambient temperature was above 45 degrees.  In Oklahoma, that is  most of the year.  This turned out to save over $350,000 per year in energy savings at a cost of about 1.5 cents per kilowatt-hour.  Not to mention the unknown savings from being able to lower the flue gas temperature by 40 degrees.

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Making Friends from Foes – A Tale of Power Plant Woes

Later in life, thinking back to when I was young, I sometimes wonder at how my first real friend, Mark Schlemper remained my friend throughout my childhood.  I remember as a boy, there were times when I wasn’t the friendliest friend.  Sometimes I was downright selfish.  Mark, on the other hand, was always considerate.  Not in an Eddie Haskell way, but in a sincere way.  I learned a lot about being a kinder person from Mark, and I’m forever grateful.

Mark Schlemper with his Mother.  Two very good people.

My favorite picture of Mark Schlemper with his Mother

I think if Mark had not been my friend during my childhood, then this story would have a very different ending.

Last Friday (April 18, 2014), I posted a story called “Vertan or Sand and Making Enemies of a Power Plant Man“.  At the end of that post I explained that I had become the enemy of a team leader during the “We’ve Got The Power” program.  I explained this program in the post:  “Power Plant ‘We’ve Got The Power’ Program“.  With all that said, here is the story:

I was a plant electrician at a coal-fired power plant in North Central Oklahoma when we took part in the “We’ve Got The Power” program.  At the time, I was in charge of maintaining the Unit 1 precipitator.  The precipitator is what takes the ash out of the exhaust from the boiler, so that you don’t normally see smoke coming out of a Power Plant Smokestack.

My bucket buddy in the Electric Shop, Diana Brien was on a team that tried an experiment on the Unit 1 precipitator by injecting sand into the intake duct in the hope that it would increase the performance.  I didn’t put much faith in the experiment, because it was based on something that had happened almost a year earlier when sand was burned in the boiler in order to burn off the oil that had been soaked into the sand.

I hadn’t seen any sand build up in front of the precipitator during the next overhaul, and didn’t believe that any of it had been able to make it’s way through the economizer and the air preheaters to the precipitator.

Diagram of a boiler

Diagram of a boiler.  The precipitator is after the air preheater where it is labelled “Flue gas”

When Ron Kilman asked me about it, I said that I didn’t think it would do any good, but also, it wouldn’t do any harm either, so I told Ron that I couldn’t see any reason not to do the experiment.  Who knows.  Maybe something unexpected would happen.  — Something did, but not quite in the way anyone would have expected.

On the day of the experiment, sand was blown into the intake duct of the precipitator.  When the experiment was taking place, Diana Brien sat at the precipitator computer behind the Unit 1 Alarm Panel in the Control Room.  She was printing out readings every so many minutes as the experiment progressed.

At times, I walked by and checked on her to see how it was going.  One time when I was standing there watching the readings on the computer, all of the sudden the Opacity shot up.  Opacity is used to measure how much smoke is going out of the smoke stack.  Something definitely happened to cause a large puff of smoke.

I switched screens to look at the power on each of the control cabinets.  After a few seconds I found that cabinet 1G10 had zero Volts on the secondary side of the transformer.  It should have been somewhere above 40 Kilovolts.  The cabinet hadn’t tripped, but it wasn’t charging up the plates.  Cabinet 1G10 was in the very back row of the precipitator, and when the power shuts off on the cabinet it readily lets go of the ash that had built up on it when the rappers on the roof strike the plates.

When I saw the puff occur, I knew where to go look, because this happened whenever one of the back cabinets was turned off.  I told Dee that it looked like a fuse had blown on the cabinet.  The ash was going to continue billowing out of the precipitator for a couple of hours if I didn’t go do something about it.  So, I told Dee that I was going to go to the Precipitator Control Room and replace the fuse.

I passed through the electric shop to grab my tool bucket and headed out to the precipitator.  When I arrived, I found the cabinet just as it had indicated on the computer.  The fuse had obviously failed.  Interesting timing.  Coincidence?  I thought it was.  The fuses controlling the back cabinets were usually the ones that blew because we ran them at a much higher voltage than the rest of the cabinets (at the time).

This is a picture of the exact fuse I replaced, except the writing was pink instead of blue

This is a picture of the exact fuse I replaced, except the print was orange instead of blue

I quickly replaced the fuse (after attaching grounding cables to the leads, and using a pair of high voltage gloves).  Then I powered the cabinet back on.

 

High Voltage gloves like this

High Voltage gloves like this

I returned to the Control Room and told Dee that I replaced the fuse on cabinet 1G10.  The opacity had returned to normal.  I watched a few more minutes to make sure everything had stabilized, and then I left.

When Ron Kilman was evaluating the results of the experiment, he could plainly see that something strange had happened.  Smoke had been pouring out of the smoke stack in the middle of the experiment.  So, he asked me what I thought about it.

First of all, as a disclaimer, our team had our own experiments we had been conducting on the precipitator in hopes of coming up with money savings ideas.  So, when I told Ron what had happened with the fuse blowing, I wondered if he would trust me to tell the truth, since I had my own skin in the game.

I explained in detail to Ron how the fuse had blown and that I was standing next to Dee watching the computer when the smoke started blowing out of the stack.  I could tell that a fuse had blown by looking at the readings, so I went out and replaced the fuse.  I told him that fuses do blow periodically in the back of the precipitator, but I couldn’t explain why it happened to fail at that particular time.  After I gave him my explanation, he seemed satisfied that I was telling the truth.

I think a token amount of points were awarded to the team because something obviously had happened during the experiment, though it wasn’t clear that sand had anything to do with it.  On the other hand, our team was awarded a large amount of points for increasing the precipitator performance using a different method that I may bring up in a later post.  To the team that burned the sand, this looked a lot like foul play.

The leader of the team was the Shift Supervisor Jim Padgett.  He became very upset when he found out that I had gone to the precipitator control room during the experiment and worked on the equipment.  Our team had been awarded a lot of points that was enough to purchase the dining room table set that I have in my dining room today:

Dining Room Table received as an award from the "We've Got The Power" program

Dining Room Table received as an award from the “We’ve Got The Power” program

It became known throughout the control room and the electric shop that Jim Padgett viewed me as his enemy.  The other electricians would jokingly refer to Jim as my “friend”, knowing that Jim had basically declared “war” on me.  Any time someone in the shop would have something to say about Jim, they would say, “Kevin’s friend” Jim Padgett….”

When I first became aware that Jim was upset with me, I understood why.  If I had been in his shoes I would probably feel the same way.  It’s a rotten feeling when you believe that someone has cheated you out of something important.  So, I decided up front that I was going to become Jim’s best friend.  This is where I think my memory of Mark Schlemper with his patience for me as a boy helped me with this decision.

I had determined that any time Jim asked me to do something I wouldn’t hesitate to help him.  It took about a year before Jim could look at me without grimacing.  Finally, one day, he asked me if I would go look at something for him to see if we needed a clearance, or if it was something that could be fixed right away.  It was something minor, but I knew that this was an indicator that the ice was finally beginning to melt.  I was able to fix the problem on the spot, and returned to let him know.

Once we were on semi-speaking terms again, I took an opportunity one day to ask Jim if he would like to join our Computer Club.  I had started a Computer Club in the Electric Shop.  Anyone could join it for a one time fee of $5.00 that was used to buy shareware and disk cases.  For a while I also published a newsletter letting the members of the club know what games and such we had that could be checked out.

Once Jim Padgett joined the Computer Club, it was much easier to have a regular conversation outside of the normal daily business.  I had put the thought in my mind when I decided that Jim was going to become my best friend that nothing would make me happier than to be able to do something for Jim.  That way, no matter what I was doing at the time, if Jim asked me to do something for him, I would drop whatever I was doing and do my best to help.

I could go on and on explaining how gradually over time, not only was Jim my friend, but Jim acted more and more as if I was his friend as well.  Let me just say that the entire process took almost exactly ten years.  I can remember the exact moment when Jim indicated to me that I had become his friend.

Here is what happened:

The phone next to my bed rang at 2:15 in the morning on Thursday February 17, 2000.  I instantly knew what it meant when the phone rang in the middle of the night.  It meant that someone at the plant was calling because there was a problem.  Who else would be up on in the middle of the night?  The night shift of course.

When I answered the phone, Jim Padgett said, “I hate to wake you up buddy.”  I replied, “No.  That’s okay.  What’s up?”  Jim explained that the dumper was down and a train was about halfway through dumping the coal and everything was dead in the water.  I said, “Ok.  I’ll be right out.”

I turned to Kelly and told her that I had to go fix the dumper.  She already knew of course.  I pulled on a pair of jeans, a flannel shirt, and on the way out the door, I slipped on my work boots and laced them up.  Then I drove the 30 miles out to the plant.

It was just before 3:00 am when I arrived.  I grabbed my hardhat from the electric shop and took the elevator up to the Control Room.  Jim apologized again and told me that how the dumper acted when it shutdown.  I went back down the elevator to the electric shop where I grabbed the key to the pickup truck and my tool bucket and left the electric shop into the cool night air.  Power Plants at night take on magical properties.  It’s hard to explain.

When I arrived at the coalyard, I went straight into the Dumper Switchgear where the relays that controlled the dumper were mounted.  Having worked on the dumper for the past 17 years, I could troubleshoot the circuits in my sleep.  — Actually, I may have done just that.  It didn’t take long, and I had replaced a contact on a relay that had broken and had the Coalyard Operator test the dumper long enough to know it was going to work.

When I returned back to Control Room Jim was sitting in the Shift Supervisor’s office.  I walked in and showed him the small relay contact that had caused the failure.  Jim, looked at me and said something that I thought only a friend would say so casually.  I won’t use his exact words, though I remember not only the exact words, I remember his exact expression.  He indicated to me that he had passed some gas, and he was apologizing about it.  I replied, “Well.  That happens.” (No.  Not the other thing that happens).  I told him I was going to go home.  It was about 3:40 by that time.

Jim wished me a good night, and thanked me again for coming  out.  As I was going back to the parking lot, and on the way home driving through the dark, tired from being woken up in the middle of the night, I had a great feeling of peace.  That brief conversation with Jim just before I left was so pleasant in an odd way that I knew we had become friends.  This was such a long way from where we had been 10 years earlier when Jim had literally wanted to kill me (well, not that he actually would…).

When I arrived home, I peeled my clothes off in the utility room to keep from tracking coal all over the house.  I set the small broken relay contact on the kitchen table as a token to my wife, so she could see why I was called out when she wakes up in the morning.  I climbed back into bed around 4:15 to sleep for another two hours.

That morning when I arrived at the plant, the first thing I learned was that about the time that my alarm had woken me up that morning, Jim Padgett had left his shift and driven to his home in Ponca City.  When he walked in the door to his house, he collapsed and died instantly of a heart attack.  That would have been about 3 hours after the moment that we had said goodbye.

 

Jim Padgett is on the far left along with his crew of True Power Plant Men

Jim Padgett is on the far left along with his crew of True Power Plant Men

I grieved for Jim’s wife Jane, who had worked for a while at the plant before marrying Jim, but I didn’t grieve for Jim.  Something told me, and maybe it was Jim, that he was at peace.  In the moment that I heard about Jim’s death, I burned the conversation we had just had into my mind so that I would never forget it.

To this day whenever I know that someone is upset with me for something that I have done to them personally, I am determined that they will become one of my best friends.  I will do anything for that person if they ask (unless, of course it is to “not be their friend”).  I have my childhood friend Mark Schlemper to thank for the attitude that helped me decide to reach out to Jim Padgett.  Without that experience while growing up, Jim and I would never have become friends.

I would like to leave you with a song that reminds me of Jim whenever I hear it.  It is called “Bright Eyes” from the movie “Watership Down”. Art Garfunkel sings it:

Note:  If you are not able to watch the video above, try clicking this link:  Bright Eyes, Art Garfunkel