コージェネレーションを対象とした排熱回収発電システムに関する研究: （第2報，スクロール蒸気膨張機の性能特性の基礎的解明）

摘要

エネルギ有効利用技術の一つとして，熱と電気を同 時供給するコージェネレーションシステム（CGS）が 注目されている．近年のCGSの動向として，原動機規 模の小容量化や，年間を通して熱需要が変動する事業 所や家庭用などへの導入が挙げられる．%In this study, we aim to construct the heat recovery generation system using steam Rankin cycle for cogeneration by low capacity prime mover of about 500 kW or less. As power recovery device, we focused attention on the scroll expander with high-efficiency potential. However, performance characteristics of the scroll expander for steam are not apparent. The purpose of this paper is to clarify the performance characteristics of the scroll steam expander. As the result of comparing performance characteristics of steam with that of compressed air, at the condition of constant suction pressure (300 kPa) and rotation speed of in the range from 500 rpm to 3 000 rpm, the net efficiency of compressed air is in the range of 50% to 20%, on the other hand, that of steam is in the range of 10% to 40%. Moreover, in case of steam, it was shown that the influence of the leakage loss and the heat loss are the largest.