Cycle Analysis of Low and High H_2 Utilization SOFCs/Gas Turbine Combined Cycle for CO_2 Recovery

摘要

Global warming is mainly caused by CO_2 emission from thermal power plants, which burn fossil fuel with air. One of the countermeasure technologies to prevent global warming is CO_2 recovery from combustion flue gas and the sequestration of CO_2 underground or in the ocean. SOFC and other fuel cells can produce high-concentration CO_2, because the reformed fuel gas reacts with oxygen electro-chemically without being mixed with air, or diluted by N_2. Thus, we propose to operate the multistage SOFCs under high utilization of reformed fuel for obtaining high-concen-trationCO_2. In this report, we have estimated the multistage SOFCs' performance considering H_2 diffusion and the combined cycle efficiency of multistage SOFC/gas tur-bine/CO_2 recovery power plant. The power generation efficiency of our CO_2 recovery combined cycle is 68.5% and the efficiency of conventional SOFC/GT cycle is 57.8% including the CO_2 recovery amine process.