Patent ID: 6499300
Filing Date: 2002-12-31
Classification: F02C,H01M,Y02E

Abstract:
A method for operating a power plant with a closed or quasi closed CO2 process, wherein the power plant comprises at least one compressor, at least one turbine, at least one generator, at least one recuperator and at least one burner unit with at least one oxygen separation device and at least one burner, wherein the burner unit is supplied with oxygen-containing gas, compressed and heated CO2 medium from the CO2 process, and fuel or a fuel/steam mixture, the method comprising:removing oxygen from the oxygen-containing gas using the oxygen separation device and adding it to the CO2 medium, wherein a combustion of the oxygen-enriched CO2 medium with the fuel takes place in the at least one burner; expanding hot, compressed CO2 medium exiting from the at least one burner in the turbine; cooling the expanded, hot CO2 medium in the recuperator; cooling the expanded CO2 medium in the compressor; heating the compressed, cooled CO2 medium in the recuperator; and supplying an additional burner in the burner unit with a portion of the oxygen-enriched CO2 medium as well as with fuel or fuel/steam mixture, whereby CO2 medium formed by the combustion taking place in the additional burner is mixed with the heated CO2 medium at the inlet of the oxygen separation device or upstream from the inlet.