Gas turbine having exhaust recirculation
AssigneeALSTOM Technology Ltd
InventorsElisabetta Carrea, Timothy Griffin, Peter Jansohn
Life of this patent
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Abstract
A gas turbine adapted to operate in a highly diluted mode comprises a compressor 3 adapted to compress oxidant 5; a combustion chamber 3 adapted to accept the compressed oxidant 7 and provide an exit means for flue gas 9; a turbine 4; and a flue gas re-circulation means 12,13 adapted to re-circulate the flue gas 9 from the combustion chamber 3 and mix the said flue gas with the compressed oxidant 7 from the compressor 2 in order to provide a highly diluted mode of combustion with a flue gas re-circulation rate of from 100% to 200%.
Claims40
A gas turbine capable of operating in a highly diluted mode, the gas turbine comprising:
- a compressor adapted to compress oxidant;
- a combustion chamber adapted to accept the compressed oxidant and including an exit means for flue gas;
- a turbine;
- and
- flue gas re-circulation means for re-circulating the flue gas from the combustion chamber and mixing the flue gas with the compressed oxidant from the compressor to provide a highly diluted mode of combustion with a non-visible flame with a flue gas re-circulation rate of from 100% to 200%;
- wherein the flue gas re-circulation means is also for mixing the re-circulated flue gas with a premixed stream of fuel and oxidant before the premixed stream enters the combustion chamber.
A method of operating a gas turbine comprising:
- using a compressor to compress oxidant;
- using a combustion chamber to accept the compressed oxidant and provide an exit means for flue gas;
- using a turbine;
- and
- using a flue gas re-circulation means to re-circulate the flue gas from the combustion chamber and mix the flue gas with the compressed oxidant from the compressor in order to provide a highly diluted mode of combustion with a non-visible flame with a flue gas re-circulation rate of from 100% to 200%;
- and
- using the flue gas re-circulation means to mix the re-circulated flue gas with a premixed stream of fuel and oxidant before the premixed stream enters the combustion chamber.
Dependencies are inferred from the claim text.