IMPROVED PERFORMANCE AND REDUCED EMISSION FROM COAL AND GAS FUELLED GT-SOFC AND GT-MCFC PLANTS: SOME STUDIES

摘要

This paper presents conceptual models of some novel GT-SOFC and GT-MCFC plants for power and cogeneration operating on gasified coal or natural gas. Simulated performance of the modeled plants in terms of energy efficiency, emission reduction, fuel energy savings (for cogeneration) with respect to separate reference plants for power generation and utility heat production is presented and analyzed. Influences of variations in some design and operating parameters on the plant performance are also reported in the paper. A study with a coal gasification combined cycle plant using SOFC upstream of GT suggests that such plants have the potential of delivering power at an overall efficiency level exceeding 50%. A similar plant delivering both power and utility heat can potentially save about 30% of fuel with respect to separate plants for power and heat. For a conceptualized natural gas fuelled GT-MCFC CHP plant, an electrical efficiency of more than 40% and fuel energy saving exceeding 30% are achievable. Using a CO{sub}2 separator placed at fuel cell exhaust, CO{sub}2 can be trapped in a closed cycle. CO{sub}2 emission reduction as high as 60% is achievable for such plants.