Purification works for thermal power plant
AssigneeSargas AS
InventorsHenrik Fleischer, Tor Christensen, Knut Borseth
Life of this patent
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Abstract
A method for separation of CO2 from the combustion gas from a thermal power plant fired with fossil fuel, wherein the combustion gas from the thermal power plant is used as cooled, compressed and reheated by combustion of natural gas in a combustion chamber to form an exhaust gas, where the exhaust gas is cooled an brought in contact with an absorbent absorbing CO2 from the exhaust gas to form a low CO2 stream and an absorbent with absorbed CO2, and where the low CO2 stream is heated by means of heat exchanges against the hot exhaust gas leaving the combustion chamber before it is expanded in turbines, is described. A plant for performing the method and a combined plant is also described.
Claims4
A method for separation of CO2 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 CO2 from the exhaust gas to form a low CO2 stream and an absorbent with absorbed CO2;
- g) heating the low CO2 stream by means of heat exchanges against the hot exhaust gas leaving the combustion chamber;
- and
- h) expanding the heated low CO2 stream in turbines.
Dependencies are inferred from the claim text.