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Timothy J Caron

Ralph Albert Dalla Betta

Sarento George Nickolas

Jon McCarty

Mark A Spencer

Robert Anthony Corr, Ii

Methods and apparatus for control of NO in catalytic combustion systems, and more particularly to control of thermal or/and prompt NO produced during combustion of liquid or gaseous fuels in the combustor sections of catalytic combustor-type gas turbines, by controlled injection of water in liquid or vapor form at selected locations, orientations, amounts, rates, temperatures, phases, forms and manners in the compressor and combustor sections of gas turbines. The ratio of thermal NO ppm reduction to water addition, in weight %, is on the order of 4-20, with % NO reduction on the order of up to about 50-80% and NO of below 2 ppm. Liquid water, steam or superheated steam can be used to reduce NO in combustion systems operating at reaction zone temperatures above 900&deg; C., preferably 1400&deg; C. to 1700&deg; C. The amount of water added is sufficient to provide a concentration of water in the range of from about 0.1% to about 20% by weight of the total air and fuel mixture flowing into the post catalyst reaction zone. Water is introduced simultaneously or sequentially in a plurality of locations, at selected rates, amounts, temperatures, forms, and purity, preferably in accord with a suitable control algorithm.

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Gilroy, CA, United States of America

Timothy J Caron