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A combustor for burning a mixture of fuel and air in a rich combustion zone, in which the fuel bound nitrogen in converted to molecular nitrogen. The fuel rich combustion is followed by lean combustion. The products of combustion from the lean combustion are rapidly quenched so as to convert the fue

A combustor for burning a mixture of fuel and air in a rich combustion zone, in which the fuel bound nitrogen in converted to molecular nitrogen. The fuel rich combustion is followed by lean combustion. The products of combustion from the lean combustion are rapidly quenched so as to convert the fuel bound nitrogen to molecular nitrogen without forming NOx. The combustor has an air radial swirler that directs the air radially inward while swirling it in the circumferential direction and a radial fuel swirler that directs the fuel radially outward while swirling it in the same circumferential direction, thereby promoting vigorous mixing of the fuel and air. The air inlet has a variable flow area that is responsive to variations in the heating value of the fuel, which may be a coal-derived fuel gas. A diverging passage in the combustor in front of a bluff body causes the fuel/air mixture to recirculate with the rich combustion zone.

대표청구항 ▼

A combustor for producing a hot compressed gas, said combustor having a longitudinal axis and comprising: a) an air inlet for receiving a flow of compressed air; and b) means for mixing a flow of a first fuel into said flow of compressed air, thereby producing a fuel/air mixture, said fuel and air m

A combustor for producing a hot compressed gas, said combustor having a longitudinal axis and comprising: a) an air inlet for receiving a flow of compressed air; and b) means for mixing a flow of a first fuel into said flow of compressed air, thereby producing a fuel/air mixture, said fuel and air mixing means including: (i) first swirling means for directing said flow of said first fuel in a first direction, said first swirling means having a first orientation forming a first acute angle with respect to the longitudinal axis such that said first fuel is directed in a first radial direction, and (ii) second swirling means for directing said flow of compressed air in a second direction, said second swirling means having a second orientation forming a second acute angle with respect to the longitudinal axis such that said compressed air is directed in a second radial direction, said second radial direction being opposite said first radial direction, wherein said first and second acute angles are oriented with respect to said first and second radial directions, respectively, so as to swirl said flow of said first fuel and said flow of said compressed air in a first circumferential direction.