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In order to capture CO2 with lower energy consumption, theSOFC hybrid systems with CO2 capture use the oxy-fuel combustion mode. The pure oxygen from the air separation unit (ASU) is fedinto the afterburner to burn with the anode exhaust gas. Theproduct gas only contains steam and CO2. CO2 can be separated bycondensation method, which does not consume the extra energy. Inorder to reduce the energy consumption of CO2 compression andliquefaction, the captured CO2 is fed to the multi-stage compressorsand liquefied for transportation.Because the outlet flue gas temperature of the oxy-fuel afterburner is very high, in order to maintain the appropriate turbineinlet temperature, three different methods (steam injection, CO2injection, and heat exchanger layout) are applied.
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