Method for exhaust gas treatment in a solid oxide fuel cell power plant
First Claim
1. A method for treatment of gas exiting the anode side (301) of a solid oxide fuel cell stack (1) fuelled with a carbon containing fuel (100) in a power producing process, characterized in that the anode gas and cathode gas are kept separated by a seal system in the SOFC stack (4) and that the main part of the H2 and CO in the anode exhaust (351) is separated from the CO2 in said exhaust (301) by a separation process based on H2 selective membranes (350).
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Abstract
The invention relates to anode exhaust gas treatment methods for solid oxide fuel cell power plants with CO2 capture, in which the unreacted fuel in the anode exhaust (301) is recovered and recycled, while the resulting exhaust stream (303) consists of highly concentrated CO2. It is essential to the invention that the anode fuel gas (102) and the cathode air (205) are kept separate throughout the solid oxide fuel cell stacks (1). A gas turbine (202,207) is included on the air side in order to maximise the electrical efficiency.
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Citations
13 Claims
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1. A method for treatment of gas exiting the anode side (301) of a solid oxide fuel cell stack (1) fuelled with a carbon containing fuel (100) in a power producing process,
characterized in that the anode gas and cathode gas are kept separated by a seal system in the SOFC stack (4) and that the main part of the H2 and CO in the anode exhaust (351) is separated from the CO2 in said exhaust (301) by a separation process based on H2 selective membranes (350).
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9. A method for treatment of gas exiting the anode side (301) of a solid oxide fuel cell stack (1) fuelled with a carbon containing fuel (100) in a power producing process,
characterised in that the anode gas and cathode gas are kept separated by a seal system in the SOFC stack (4), that the main part of the H2 and CO in the anode exhaust (301) is separated from the CO2 in said exhaust by a separation process based on compressing (312), drying (319) and cooling (321) to a pressure and temperature where most of the CO2 is in liquid form (322) and subsequently is separated from the H2 and CO in a conventional gravity based separation process (323).
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