Patent ID: 8006478
Filing Date: 2011-08-30
Classification: B01D,C01B,C10J,F01K,F02C,Y02E

Abstract:
1. A method for operating a power plant, which power plant includes at least one compressor, at least one turbine, and at least one burner arrangement including at least one pre-burner and at least one afterburner, the method comprising: compressing an oxidizer gas containing oxygen gas in the compressor; burning the compressed oxidizer gas under lean conditions and with a fuel gas in at least one pre-burner of the burner arrangement; feeding a combustion exhaust gas from the pre-burner to an oxygen-removal device which removes part of the oxygen gas from the combustion exhaust gas in which said oxygen gas part is contained; burning the combustion exhaust gas with a reduced oxygen content with a fuel gas downstream of the oxygen-removal device in at least one afterburner of the burner arrangement; feeding a combustion exhaust gas from the afterburner to the turbine and expanding said combustion exhaust gas from the afterburner in the turbine; discharging the oxygen removed from the combustion exhaust gas from the pre-burner from the oxygen-removal device by a sweep gas, wherein the sweep gas is an inert gas or a fuel-free gas; providing a steam generating device incorporated in an exhaust gas path of the turbine; evaporating a liquid with the aid of a turbine exhaust gas; cooling the turbine exhaust gas while evaporating said liquid; applying high pressure with the steam generating device to the steam; expanding the high-pressure steam in a steam turbine; and removing partially expanded steam from the steam turbine as medium-pressure steam, and admixing said partially expanded steam to a synthesis gas upstream of the at least one pre-burner, upstream of the at least one afterburner, or upstream of both.