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Power


Monthly Issue | May 15, 2006

Designing duct burners for variable GT loads

Duct burners use supplementary firing to increase the heat energy of a gas turbine’s exhaust, making it possible to increase the output of a downstream heat-recovery steam generator (HRSG). Early…


Solving plant vibration problems

Solving insidious vibration problems in rotating equipment may sometimes seem like a black art that requires the right incantation. But identifying the root cause of the vibration is actually a…


Designing and maintaining steam coil air preheaters for reliability and effectiveness

If engineered well and drained properly, a simple finned-tube heat exchanger can help maximize a fossil-fueled power plant’s combustion efficiency, capacity, and air pollution reduction. Use the guidelines in this…


Cheng Cycle flirts with 2 ppm NOx— and CO

Three years ago, an article in POWER described how Cheng Power Systems, by modifying the combustors of several popular gas turbines, had used steam injection to lower the units’ NOx…


How accurate primary airflow measurements improve plant performance

The alchemy of burning any solid fuel-including coal-requires mixing fuel and air in just the right proportion at just the right time. Get the recipe wrong, and reduced efficiency and…


Curbing the blue plume: SO3 formation and mitigation

Recent, widespread additions of scrubbers and selective catalytic reduction (SCR) systems at U.S. coal-fired power plants have significantly reduced concentrations of the pollutants SO2 and NOx in America’s air. But…


Preparation keyed Entergy’s responses to Katrina, Rita

The hurricane season of 2005 produced two of the most destructive storms in U.S. history: Katrina, a Category 3 hurricane that made its second landfall in Buras, La., on August…


Recycling, reuse define future plant designs

The Valley of the Sun went off the water wagon on March 4, ending a record 136 consecutive days without measurable rainfall. That first 0.05-inch sip, followed by a 0.18-inch…


State monitoring fails the cost/benefit test

      Steven F. Greenwald and Christopher A. Hilen Utility regulators in California and other states have begun subjecting power plants to extensive oversight of their O&M activities. These oversight programs…


Focus on O&M (May 2006)

Desalination, Italian style Reverse osmosis (RO) technology has been available for all aspects of water treatment for the past 40 years. The use of RO desalination systems grew rapidly following…


Global Monitor (May 2006)

Nuclear hot streak continues U.S. nuclear power plants kept operating at high levels of safety and efficiency in 2005, according to performance indicators compiled by the World Association of Nuclear…


Greener than thou

U.S. wind power is on a roll, with wind farms sprouting like weeds. But in the near future, utilities may end up paying higher prices for wind capacity because state…


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