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January 1, 200701.01.2007 | Randy Rahm is executive director of the PRB Coal Users’ Group. He can be reached at r.rahm@ethanexenergy.com or 913-721-5819.
Over the past 17 years — dating back to the 1990 Clean Air Act Amendments and including the introduction of retail competition — coal-fired power plants have become much cleaner and more efficient. Utilities have spent many billions of dollars to... 01.01.2007 | Douglas J. Smith, IEng, Contributing Editor
If coal leaving a pulverizer isn’t dry, it may plug up the coal pipes leading to the boiler. The coal-drying process in a pulverizer is similar to that used by flash dryers. Certain coals should be preheated to make them more combustible. Generally... 01.01.2007 | Bradley Adams, Marc Cremer, and Andrew Chiodo, Reaction Engineering International; Craig Giesmann and Ken Stuckmeyer, Ameren; and John Boyle, Fuel Tec
Historically, cyclone-fired boilers have been characterized as big emitters of NOx due to the very high temperatures in their primary combustion zone. Uncontrolled levels from 0.8 to 1.9 lb/mmBtu have been typical. The design of cyclone-fired units makes them... 01.01.2007 | Charles E. Trippel, PE, is a vice president with Advanced Combustion Technology Inc. He can be reached at ctrippel@advancedcombustion.net.
Layering NOx control technologies can reduce a coal-fired unit’s NOx emissions to levels achievable by selective catalytic reduction alone. Advanced Combustion Technology Inc. (ACT) (www.advancedcombustion.net) has demonstrated that using several in... 01.01.2007 | Hans Sobolewski, Hans Hartenstein, and Marilynn Martin, Steag LLC, and Joseph Jancauskas and Michael Harrell, J.M. Stuart Electric Generating Station
Large-particle ash (LPA), also called popcorn ash (Figure 1), is a serious concern for many coal-fired utility boiler operators who have retrofitted their unit(s) with a high-dust selective catalytic reduction (SCR) system. LPA formed in the boiler can easily... 01.01.2007 | Kennedy Maize
To borrow shamelessly from Charles Dickens, one of my favorite authors, for coal in 2006, "It was the best of times, it was the worst of times." No Escape The year began in horror. On January 2, most likely a result of a severe lightning strike... 01.01.2007 | Douglas J. Smith, IEng, Contributing Editor
When you receive a shipment, you don’t wait weeks to see whether you got what you paid for — do you? J.M. Stuart Generating Station doesn’t, but it used to. Since coming on-line in the early 1970s, the big plant, on the Ohio River near... 01.01.2007 | Dr. Robert Peltier, PE, Editor-in-Chief
When Charles Dickens began A Tale of Two Cities with, "It was the best of times, it was the worst of times," he was referring to the French Revolution of the late 18th century. But Dickens’ words apply equally well to the American generation... 01.01.2007
The February 1907 issue of POWER magazine reported on the construction of a new coal-fired steam engine plant on the Merrimac River outside of Lawrence, Mass. According to the plant’s owner, "the simplest and most flexible means for handling... |
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