System and method for protecting components in a gas turbine engine with exhaust gas recirculation

摘要

A system includes a gas turbine engine that includes a combustor section having one or more combustors configured to generate combustion products, a turbine section having one or more turbine stages between an upstream end and a downstream end, an exhaust section disposed downstream from the downstream end of the turbine section, and a fluid supply system coupled to the exhaust section. The one or more turbine stages are driven by the combustion products. The exhaust section has an exhaust passage configured to receive the combustion products as an exhaust gas. The fluid supply system is configured to route a cooling gas to the exhaust section. The cooling gas has a temperature lower than the exhaust gas. The cooling gas includes an extracted exhaust gas, a gas separated from the extracted exhaust gas, carbon dioxide, carbon monoxide, nitrogen oxides, or a combination thereof.

主权项

1. A system, comprising:
a gas turbine engine, comprising:
a combustor section having one or more combustors configured to generate combustion products;a turbine section having one or more turbine stages between an upstream end and a downstream end, wherein the one or more turbine stages are driven by the combustion products;an exhaust section disposed downstream from the downstream end of the turbine section, wherein the exhaust section comprises an exhaust passage configured to receive the combustion products as an exhaust gas, and a manway configured to provide access to an interior of the exhaust section, wherein the manway comprises one or more openings fluidly coupled to the exhaust passage; anda fluid supply system coupled to the exhaust section, wherein the fluid supply system is configured to process a cooling gas and to route the cooling gas to the exhaust section and through the manway to the interior of the exhaust section, wherein the cooling gas has a temperature lower than the exhaust gas, wherein at least a portion of the cooling gas is configured to exit the interior of the exhaust section into the exhaust passage through the one or more openings of the manway, wherein the cooling gas comprises an extracted exhaust gas, a gas separated from the extracted exhaust gas, carbon dioxide, carbon monoxide, nitrogen oxides, or a combination thereof, and the cooling gas comprises less than 10000 parts per million by volume (ppmv) of oxygen.