AXIAL STAGE COMBUSTION SYSTEM WITH EXHAUST GAS RECIRCULATION

摘要

A method of operating an axial stage combustion system in a gas turbine engine (12) including an EGR system (14) that extracts a portion of exhaust gas produced by the gas turbine engine (12) to a second axial stage of a combustor (18). The extracted exhaust gas is provided at an elevated temperature to a group of injector nozzles (50) at the second axial stage (34) of the combustor (18). A secondary fuel supply line (34) extends to an inlet on each of the injector nozzles (50), and the fuel is mixed with the exhaust gas within the injector nozzles (50) and the mixture of fuel and exhaust gas is injected into the second axial stage (34) of the combustor (18).

主权项

1. A method of operating an axial stage combustion system in a gas turbine engine having an axial stage combustor supplying hot working gases to a turbine, the method comprising:
providing a fuel supply line supplying a fuel to the combustor; supplying compressed air to a head end of a combustor and mixing the compressed air with the fuel; igniting the fuel and compressed air in a first axial stage of the combustor to form a hot working gas supplied to the turbine; providing an exhaust gas recirculation (EGR) system extracting a portion of exhaust gas produced by the gas turbine engine to a second axial stage of the combustor, including:
conveying a mass flow of exhaust gas extracted from the gas turbine engine to a group of injector nozzles at the second axial stage of the combustor;conveying a flow of fuel through a secondary fuel supply line to each of the injector nozzles, wherein the secondary fuel supply line extends to an inlet on each of the injector nozzles to isolate the fuel from the exhaust gas; and mixing the fuel with the exhaust gas within the injector nozzles and injecting the mixture of fuel and exhaust gas into the second axial stage of the combustor.