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Apparatus and method for combusting low quality fuel

United States Patent

November 4, 2003
View the Complete Patent at the US Patent & Trademark Office
A gas turbine (12) capable of combusting a low quality gaseous fuel having a ratio of flammability limits less than 2, or a heat value below 100 BTU/SCF. A high quality fuel is burned simultaneously with the low quality fuel to eliminate instability in the combustion flame. A sensor (46) is used to monitor at least one parameter of the flame indicative of instability. A controller (50) having the sensor signal (48) as input is programmed to control the relative flow rates of the low quality and high quality fuels. When instability is detected, the flow rate of high quality fuel is automatically increased in relation to the flow rate of low quality fuel to restore stability.
Brushwood; John Samuel (Oviedo, FL), Pillsbury; Paul (Winter Springs, FL), Foote; John (Sylacauga, AL), Heilos; Andreas (Muelheim, DE)
Siemens Westinghouse Power Corporation (Orlando, FL)
09/ 963,282
September 26, 2001
STATEMENT OF GOVERNMENT INTEREST This invention was made with United States Government support under contract number DE-FC21-90MC25140 awarded by the Department of Energy. The United States Government has certain rights in this invention.