固体酸化物形燃料電池-スターリングエンジンコンバインドシステムの検討(熱工学,内燃機関,動力など)

概要

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Cycle simulations have been made on solid oxides fuel cell-Stirling engine combined system (SOFC-SE C.S.) fueled with methane to investigate the feasibility of the combined system. The model system consists of an SOFC with internal reforming, a combustor burning residual fuel exhausted from the SOFC, a coventional Stirling engine and an air-preheater recovering the exhausted heat from the engine. In this system, the SOFC serves simply as the topper of the engine. The cycle calculations focus on the influences of temperature effectiveness of the preheater, the number of transfer unit of the Stirling engine heat exchanger and the air excess ratio on the system efficiency and the operation condition. The system analysis shows that the system efficiency attains up to 55% at reasonable preheater temperature effectiveness of 0.8 and the air excess ratio of 3.0, while the operation is restricted to a narrow range of the number of transfer unit due to the allowable preheater temperature and the required SOFC inlet temperature. The cell temperature is not sufficiently high at the air excess ratio of 3.0 and the lower air excess ratio improves the system efficiency. At the air excess ratio of 2.0, the combined system shows 10% gain in efficiency compared to the pure SOFC system.
社団法人日本機械学会の論文
2004-01-25