Power plants – Combustion products used as motive fluid – With addition of steam and/or water
Patent
1989-04-17
1990-09-25
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
With addition of steam and/or water
60732, F02C 700
Patent
active
049584880
ABSTRACT:
An external combustion system for a stationary gas turbine engine includes a rich zone combustor, a water or steam quench stage, a lean zone combustor and a dilution stage. Fuel such as natural gas or liquid hydrocarbon, which forms no ash or slag, burns in a primary air supply in the rich zone combustor at an equivalence ratio exceeding 1 which inhibits rapid formation of of oxides of nitrogen. The effluent from the rich zone combustor is a stream of combustible gas including carbon monoxide and hydrogen. The combustible gas stream is quenched in the quench stage and mixed with a secondary supply of compressed air in the lean zone combustor. The combustible gas ignites spontaneously in the lean zone combustor and burns at an equivalence ratio of less than 1 and at a temperature below the range characterized by rapid formation of oxides of nitrogen. The discharge from the lean zone combustor is a stream of hot gas motive fluid which is diluted in the dilution stage and introduced into the turbine section of the engine.
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Carlstrom, L. A. et al., "Improved Emissions Performance in Today's Combustion Systems", AEG/SOA 7805, International Seminar, Jun. 1978. pp. 1 and 17.
Mongia Hukam C.
Tramm Peter C.
Wilkes Colin
Casaregola Louis J.
General Motors Corporation
Schwartz Saul
Thorpe Timothy S.
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