Method and apparatus for decreasing combustor emissions
AssigneeGeneral Electric Company
InventorsJagdish Dullabhbhai Mistry, James William Stegmaier
Life of this patent
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Abstract
A combustor for a gas turbine engine includes a fuel delivery system that uses circumferential fuel staging. The fuel delivery system includes a plurality of fuel supply rings and a backpurge sub-system. The fuel supply rings are arranged concentrically at various radial distances to supply fuel to a combustor through a plurality of combustor manifolds and pigtails. The backpurge system uses high temperature and high pressure combustor air to purge fuel from non-flowing fuel supply rings, combustor pigtails, and combustor manifolds. Additionally, the fuel delivery system includes at least two orifices to minimize pressure decays during filling stages.
Claims18
A method for supplying fuel to a gas turbine engine combustor, the gas turbine engine including a fuel delivery system including a plurality of concentric fuel supply rings and a backpurge sub-system, the fuel supply rings in flow communication with a plurality of combustor manifolds, said method comprising the steps of:
- delivering fuel to at least one combustor manifold through at least one of the fuel supply rings;
- and
- supplying combustor air pressure to the combustor manifolds not in operation through the backpurge sub-system to purge fuel from the remaining combustor manifolds.
A fuel delivery system for a gas turbine engine, said fuel delivery system comprising:
- a plurality of fuel supply rings for supplying fuel to a plurality of combustor manifolds;
- and
- a backpurge sub-system in flow communication with said plurality of fuel supply rings, said backpurge system configured to use combustor air pressure for purging fuel from said fuel delivery system.
A gas turbine engine comprising:
- a combustor;
- and
- a fuel delivery system comprising a plurality of fuel supply rings and a backpurge system, said plurality of fuel supply rings configured to supply fuel to said combustor, said backpurge system in flow communication with said plurality of fuel supply rings and configured to use combustor air pressure for purging fuel from said fuel delivery system.
Dependencies are inferred from the claim text.