Power plants – Combustion products used as motive fluid – With variable oxidizer control
Patent
1996-05-29
1997-03-25
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
With variable oxidizer control
60737, F02C 950
Patent
active
056133570
ABSTRACT:
A generally annular combustor system has a combustion chamber with an annular chamber portion and a plurality of can-like chamber portions protruding tangentially from the annular chamber portion, the portions collectively defining a single stage combustor. An external fuel/air premixer is associated with each can chamber portion to provide a preselected, nominally constant, lean fuel/air ratio mixture. A portion of the total compressed air flows to the premixers and the remaining portion is ducted to convection cooling passageways and finally admitted as dilution air proximate the exit of the annular chamber portion. When the fuel/power setting is changed, the combustion air flow is automatically set by varying the position of air valves associated with each premixer to achieve the desired combustible mass flow. In one embodiment, the air valve controls the dilution air flow rate from the plenum region and thus, indirectly, the combustion air flow rate. In an alternative embodiment, the air valve controls the combustion air to the premixers directly. Each premixer includes a venturi and a fuel nozzle for spraying liquid fuel or gas into the venturi inlet along the venturi axis to provide the fully premixed fuel/air mixture. The annular chamber portion advantageously can be nested between the compressor and turbine components of large axial-type flow gas turbines.
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