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A gas turbine combustor comprises an inner cylinder provided with louvers in an outer periphery thereof, defines a head combustion chamber and a main combustion chamber located downstream of and greater in diameter than the head combustion. An outer cylinder surrounds the inner cylinder and defines

A gas turbine combustor comprises an inner cylinder provided with louvers in an outer periphery thereof, defines a head combustion chamber and a main combustion chamber located downstream of and greater in diameter than the head combustion. An outer cylinder surrounds the inner cylinder and defines an air passage therebetween. A first burner communicates with the head combustion chamber and supplies air with gaseous fuel, and a second burner being disposed in the air passage near the head combustion chamber and supplying air and gaseous fuel into the main combustion chamber. The second burner is formed with a plurality of air inlets by a plurality of vanes which are disposed in an annular passage and which swirl the air, and with gaseous fuel jet ports near the inner peripheries of the air inlets. When the flow rate of the supplied fuel is small, the fuel flows along an inner-peripheral surface of the second burner, and when the flow rate is large, the fuel from the air inlets moves from the inner-peripheral surface toward the outer-peripheral surface of the second burner so as to be mixed well with the air supplied into the main combustion chamber. Thus, the production of NOx, CO, HC etc. can be decreased over the whole operating range of the turbine.

대표청구항 ▼

A combustor for a gas turbine comprising: inner cylinder means for defining a combustion chamber with a plurality of louvers for supplying air into said combustion chamber, said combustion chamber including a head combustion chamber and a main combustion chamber, said main combustion chamber being d

A combustor for a gas turbine comprising: inner cylinder means for defining a combustion chamber with a plurality of louvers for supplying air into said combustion chamber, said combustion chamber including a head combustion chamber and a main combustion chamber, said main combustion chamber being disposed downstream of said head combustion chamber and having a larger cross-sectional area than said head combustion chamber taken along a plane perpendicular to a longitudinal axis of said combustion chamber; outer housing means for surrounding said inner cylinder means to form an air passage means communicating with said combustion chamber through said louvers; first fuel supply means for supplying a gaseous fuel into said head combustion chamber; first air supply means for supplying air for a combustion process into said combustion chamber, with fuel from said first fuel supply means being combusted in said head combustion chamber to form flames which flow into said main combustion chamber; second air supply means arranged annularly and mounted adjacent to said head combustion chamber, for swirling and supplying air from said air passage means into said main combustion chamber so that air is injected substantially axially to the swirling air so as to surround the flames which flow into the main combustion chamber, said second air supply means comprises an inner cylinder extending coaxially of said inner cylinder means defining the combustion chamber, an outer cylinder surrounding said inner cylinder at a spacing therefrom, and a plurality of axially inclined vanes disposed in an annular space defined by said inner and outer cylinders and defining a plurality of air passages; and second fuel supply means for supplying gaseous fuel into said main combustion chamber, said second fuel supply means having a plurality of inlet ports arranged such that gaseous fuel is injected so as to flow inside of air flowing from said air passage means to said main combustion chamber to contact an outside of the flames at a low flow rate of gaseous fuel and traverses the air flow from said air passage means and mixes with the injected swirling air at a high flow rate of gaseous fuel, said second fuel supply means having a plurality of fuel inlet port means each of which is disposed in a portion of said air passages near said inner cylinder.