Abstract
For protection of the global environment, suppression of CO2 gas emission from power systems is required. In the present paper, separation of CO2 gas from fossil fuel with a combined SOFC and turbine system is proposed to satisfy this requirement. The results from a model calculation of the system indicate that the total thermal efficiency of the system is higher than 60% (LHV) and increases with increase in fuel utilization and also with decreases in excess air factor, steam carbon ratio, air recirculation ratio and system pressure. Furthermore, CO2 concentration in the exhaust gas from the present system is 1/10 or less of that from existing heat engines. In addition, CO2 concentration supply to a CO2 separator in the system is 10 times as high. This means that the present CO2 separator can be minimized in volume to about 1/10 of the volume of separators applied to existing systems.
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