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Laramie River Station generates more power

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Autor:	pc2drth
Opis:	This bright, shiny new turbine at Laramie River Station Unit Three has "more, more, more" to make "more" electricity without using more energy. Here's how. (John Ciz/Plant engineer): "We started this project the very first day of the outage. As soon as the equipment was cool enough to work on, we started disassembling and it's been going on ever since." Each of the three units at Laramie River Station is getting a turbine upgrade. Plant engineer John Ciz says the difference in the intermediate pressure section of the turbine is the blades. They have a more curved, sweeping shape, than the old square blades. In the new turbines high pressure section, there are eight rows of blades, rather than six. (John Ciz): "The blades are designed a little better too. Theres fewer blades, they're spaced farther apart, and they're shaped a little bit differently." These blades also have that sweeping shape a product of computer engineering. (John Ciz): "The ability to make the blades more complex now is better than 20 years ago. They have better tooling, better machines to make the blades more efficient. They've also added two additional stages that essentially break it down a little further and get more efficiency out of it." Each new turbine will put out an extra twelve megawatts of electricity. (John Ciz): "That's the whole point, is to be able to generate more megawatts with the exact same steam flow." The blades are manufactured in England, the rotor is forged in Poland, and the fixed blades and fit-up assembly is done in Mexico. Each upgrade costs about $8 million. Once all three units have a new turbine, LRS will put out an extra 36 megawatts. Another project during this plant outage is the generator rewind. All these bars, or windings, are sawed off and pulled out. Maintenance planner and scheduler Myron Mattern says these are basically copper pipes, made to allow water through for cooling. Once all the windings are out, the generator is cleaned down to the bare steel. Then, two rows of new windings are fitted in -- 84 bars in all. Hence, a rewind. (Myron Mattern/Maintenance planner/scheduler): "You don't want copper bars moving around in there, rubbing holes. You get water leaks, then you have major leak problems." The reason this rewind had to be done was because General Electric found that this model of generator was having water leakage problems. Mattern says fixing this problem now is cheaper in the long run. (Myron Mattern): "An on-line failure is catastrophic. You're down for months, instead of weeks." To top off this outage, theres work being done in the boiler checking for leaky tubes. LRS Unit Three will be back on-line by the end of May. For Basin Electric, I'm Tracie Bettenhausen.
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Tagi: Laramie River Station Basin Electric Power Cooperative Wheatland Wyoming coal plant energy efficiency Bismarck North Dakota

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