Patent ID: 7559977

Claim:
A method for separation of CO 2 from the combustion gas from a thermal power plant fired with fossil fuel, the method comprising the following steps; a) cooling and mixing the combustion gas from the thermal power plant with air; b) compressing the combustion gas—air mixture; c) reheating the compressed gas from step b) by using it as an oxygen containing gas for combustion of natural gas in a pressurized combustion chamber to form an exhaust gas; d) regulating the supply of natural gas and oxygen containing gas in the combustion chamber so that the exhaust gas contains less than 6% rest oxygen; e) keeping the temperature in the exhaust gas between 700 and 900° C. by generation of steam in tubular coils in the combustion chamber; f) cooling the exhaust gas and bringing it in contact with an absorbent absorbing CO 2 from the exhaust gas to form a low CO 2 stream and an absorbent with absorbed CO 2 ; g) heating the low CO 2 stream by means of heat exchanges against the hot exhaust gas leaving the combustion chamber; and h) expanding the heated low CO 2 stream in turbines.