CO₂回収用SOFC/ガスタービン複合発電のサイクル計算

抄録

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.