Flame holding tolerant fuel and air premixer for a gas turbine combustor
First Claim
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1. A fuel nozzle comprising:
- an outer peripheral wall and an inner peripheral wall proximate said outer wall, said outer wall and said inner wall defining an annular cavity therebetween, said annular cavity forming a peripheral cooling passage;
a nozzle center body disposed within said outer wall, the nozzle center body comprising;
an end wall at a distal end thereof;
a gas fuel passage defined within said nozzle center body and extending at least part of a length therein; and
a nozzle cooling passage defined within said nozzle center body and extending at least part circumferentially of a length therein, the nozzle cooling passage defining an inlet for flow of a cooling fluid;
a fuel/air premixer surrounding a proximal end portion of said nozzle center body and including an air inlet, a fuel inlet, and a plurality of vanes in flow communication with the fuel inlet;
wherein said inner peripheral wall and said nozzle center body define a premixing passage therebetween, into which said premixing passage said fuel/air premixer discharges; and
wherein said cooling fluid is conveyed from said nozzle cooling passage to said peripheral cooling passage;
wherein said nozzle cooling passage is in fluid communication with a source of air or inert gas; and
wherein said peripheral cooling passage is in flow communication with said premixing passage through at least one outlet orifice.
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Abstract
A fuel nozzle with active cooling is provided. It includes an outer peripheral wall, a nozzle center body concentrically disposed within the outer wall in a fuel and air pre-mixture. The fuel and air pre-mixture includes an air inlet, a fuel inlet and a premixing passage defined between the outer wall in the center body. A gas fuel flow passage is provided. A first cooling passage is included within the center body in a second cooling passage is defined between the center body and the outer wall.
39 Citations
6 Claims
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1. A fuel nozzle comprising:
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an outer peripheral wall and an inner peripheral wall proximate said outer wall, said outer wall and said inner wall defining an annular cavity therebetween, said annular cavity forming a peripheral cooling passage; a nozzle center body disposed within said outer wall, the nozzle center body comprising; an end wall at a distal end thereof; a gas fuel passage defined within said nozzle center body and extending at least part of a length therein; and a nozzle cooling passage defined within said nozzle center body and extending at least part circumferentially of a length therein, the nozzle cooling passage defining an inlet for flow of a cooling fluid; a fuel/air premixer surrounding a proximal end portion of said nozzle center body and including an air inlet, a fuel inlet, and a plurality of vanes in flow communication with the fuel inlet; wherein said inner peripheral wall and said nozzle center body define a premixing passage therebetween, into which said premixing passage said fuel/air premixer discharges; and wherein said cooling fluid is conveyed from said nozzle cooling passage to said peripheral cooling passage; wherein said nozzle cooling passage is in fluid communication with a source of air or inert gas; and wherein said peripheral cooling passage is in flow communication with said premixing passage through at least one outlet orifice. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification