Abstract
The present paper discusses performance analysis of the combined power generation system with a solid oxide fuel cell (SOFC) - micro gas turbine (MGT) hybrid system and die exhaust heat power generation system (EHPGS) based on a steam turbine (ST). The temperature range of the exhaust gas of the hybrid system is about 200-300°C,and then the effective use of the exhaust heat is significant for the improvement of the power generation system efficiency. The steam engine, which is based on the Rankin cycle using hydrocarbon fluids, is employed in the present study. Throughout the analysis, it is found that the power generation efficiency of the hybrid system is 67%(LHV) under 3.0 of the pressure ratio and 950°C of the cell average temperature. The power generation efficiency of the EHPGS driven with the exhaust heat of the hybrid system is estimated to be almost 10%. Finally, it is predicted that the power generation efficiency of the SOFC-MGT-ST combined system achieves 71%(LHV).
