GAS TURBINE WITH A SEQUENTIAL COMBUSTION ARRAGEMENT AND FUEL COMPOSITION CONTROL

摘要

The present disclosure refers to a method for operating a gas turbine with a sequential combustor arrangement having: a first burner, a first combustion chamber, and a second combustor. A fuel gas is separated into a rich fuel having a concentration of higher hydrocarbons which is higher than the concentration of higher hydrocarbons of the fuel gas supplied to the plant, and a lean fuel having a concentration of higher hydrocarbons which is lower than the concentration of higher hydrocarbons of the fuel gas. A first fuel and a second fuel mixed from at least one of the rich fuel, the lean fuel, and the fuel gas are fed to different combustors of the gas turbine.

主权项

1. Method for operating a gas turbine plant with a compressor, a turbine, and a sequential combustor arrangement having a first burner, a first combustion chamber, and a second combustor the method comprising:
compressing an inlet gas in the compressor, separating a fuel gas into a rich fuel having a concentration of higher hydrocarbons which is higher than a concentration of higher hydrocarbons of the fuel gas, and a lean fuel having a concentration of higher hydrocarbons which is lower than the concentration of higher hydrocarbons of the fuel gas, feeding a first fuel having at least one of the rich fuel, the lean fuel, and the fuel gas or a mixture thereof to at least one first burner wherein a concentration of higher hydrocarbons in the first fuel differs from the concentration of higher hydrocarbons of the fuel gas, burning the first fuel and the compressed gas in the first combustion chamber to obtain first combustion products, feeding a second fuel having at least one of the rich fuel, the lean fuel, and the fuel gas or a mixture thereof to at least one second combustor wherein an concentration of higher hydrocarbons in the second fuel differs from the concentration of higher hydrocarbons of the fuel gas and of the first fuel, burning the second fuel with the first combustion products to obtain second combustion products, and expanding the second combustion products in the turbine.