초록

A microturbine power generating system includes a reservoir that is pressurized with compressor air during system operation. The pressurized air in the reservoir is used to purge combustor fuel nozzles of residue after combustion in the combustor has ceased.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of purging fuel from one or more fuel injector nozzles in the combustor of a gas turbine engine during shutdown of said engine, said engine including a compressor having a discharge and a pneumatic accumulator for storing compressed air, said method comprising

[ What is claimed is:] [1.]1. A method of purging fuel from one or more fuel injector nozzles in the combustor of a gas turbine engine during shutdown of said engine, said engine including a compressor having a discharge and a pneumatic accumulator for storing compressed air, said method comprising the steps of:(a) bleeding air from said discharge of said compressor during operation of said turbine;(b) storing said bleed air in said accumulator;(c) interrupting the flow of fuel being delivered to said combustor;(d) communicating said accumulator with said fuel injector nozzles after said combustion in said combustion chamber has ceased, to enable said stored air to purge residual fuel from said fuel injector nozzles without creating an overspeed condition; and(f) providing a time delay, based on a predetermined value, between said step of interrupting and said step of purging, to insure that combustion in said combustor has ceased.