Method of using a primary fuel to pilot liquid fueled combustors
AssigneeRtx Corporation
InventorTimothy S. Snyder
Life of this patent
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Abstract
A fuel delivery system for a combustor of a gas turbine engine including a primary fuel tank configured to store a primary fuel, a secondary fuel tank configured to store a secondary fuel, a swirler configured to produce a main flame within a combustion chamber of the combustor, and a fuel nozzle configured to produce a pilot flame within the combustion chamber of the combustor. The fuel nozzle includes a nozzle outlet that is located proximate to an end of the swirler or at the end of the swirler, the end of the swirler being located at an inlet of the combustor. The fuel delivery system also includes a primary fuel line fluidly connecting the primary fuel tank to the fuel nozzle and a secondary fuel line fluidly connecting the secondary fuel tank to the swirler.
Claims20
A fuel delivery system for a combustor of a gas turbine engine, the fuel delivery system comprising:
- a primary fuel tank configured to store a primary fuel;
- a secondary fuel tank configured to store a secondary fuel;
- a swirler configured to produce a main flame within a combustion chamber of the combustor;
- a fuel nozzle configured to produce a pilot flame within the combustion chamber of the combustor, wherein the fuel nozzle comprises a nozzle outlet that is located adjacent to an end of the swirler or at the end of the swirler such that combustion of the primary fuel to produce the pilot flame occurs outside of the swirler, the end of the swirler being located at an inlet of the combustor, wherein the end of the swirler is an axially aftmost end of the swirler with respect to a centerline of the combustion chamber, the fuel nozzle outlet is axially inline with a surface of an end wall of the end of the swirler, wherein the surface of the end wall extends along a radial direction with respect to the centerline;
- a primary fuel line fluidly connecting the primary fuel tank to the fuel nozzle;
- a secondary fuel line fluidly connecting the secondary fuel tank to the swirler, wherein the secondary fuel does not mix with the primary fuel until the secondary fuel has exited the swirler;
- a secondary fuel pilot line fluidly connecting the secondary fuel tank to the fuel nozzle;
- and
- a pilot fuel selection valve located within the primary fuel line and the secondary fuel pilot line, the pilot fuel selection valve being configured to be actuated to one or more positions to adjust a flow to the fuel nozzle of at least one of the primary fuel and the secondary fuel.
A method of delivering fuel to a combustor of a gas turbine engine, the method comprising:
- storing a primary fuel in a primary fuel tank of a fuel delivery system;
- storing a secondary fuel in a secondary fuel tank;
- producing, using a swirler, a main flame within a combustion chamber of the combustor;
- producing, using a fuel nozzle, a pilot flame within the combustion chamber of the combustor, wherein the fuel nozzle comprises a nozzle outlet that is located adjacent to an end of the swirler or at the end of the swirler such that combustion of the primary fuel to produce the pilot flame occurs outside of the swirler, the end of the swirler being located at an inlet of the combustor, wherein the end of the swirler is an axially aftmost end of the swirler with respect to a centerline of the combustion chamber, the fuel nozzle outlet is axially inline with a surface of an end wall of the end of the swirler, wherein the surface of the end wall extends along a radial direction with respect to the centerline;
- conveying, using a primary fuel line, the primary fuel from the primary fuel tank to the fuel nozzle;
- conveying, using a secondary fuel line, the secondary fuel from the secondary fuel tank to the swirler, wherein the secondary fuel does not mix with the primary fuel until the secondary fuel has exited the swirler;
- conveying, using a secondary fuel pilot line, the secondary fuel from the secondary fuel tank to the fuel nozzle;
- and
- adjusting, using a pilot fuel selection valve, a flow to the fuel nozzle of at least one of the primary fuel and the secondary fuel.
Dependencies are inferred from the claim text.