2006 Volume 126 Issue 11 Pages 1142-1148
Global warming is mainly caused by CO2 emission from thermal power plants, which burn fossil fuel with air. One of the countermeasure technologies to prevent the global warming is CO2 recovery from combustion flue gas and the sequestration of CO2 at the underground or in the ocean. SOFC and other fuel cells can produce high concentration CO2, because the reformed fuel gas reacts with oxygen electrochemically without being mixed by air, or diluted by N2. So we propose to operate the multi-staged SOFCs under high utilization of reformed fuel for getting high concentration CO2. In this report, we have estimated the multi-staged SOFCs performance considering H2 diffusion and the combined cycle efficiency of multistage SOFC/gas turbine/CO2 recovery power plant. The power generation efficiency of our CO2 recovery combined cycle is 68.5% and the efficiency of conventional SOFC/GT cycle is 57.8% including the CO2 recovery amine process.