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(スクロール蒸気膨張機を用いたディーゼル機関冷却水からの動力回収)

概要

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In recent years, cogeneration systems (CGS) have been increasingly introduced into commercial and residential sectors from the viewpoint of effective energy utilization. However, the heat demand is fluctuant during a day and is not generally so large in the middle seasons of spring or fall. Moreover, the generation efficiency of a small capacity prime mover in commercial and residential sectors becomes low. Therefore, this study is intended to develop the waste heat recovery generation system for co-generation with a small capacity prime mover. In the present paper, the waste heat recovery generation system installed the scroll expander was constructed. This system can generate steam from the waste heat of a diesel engine coolant with the rated output of 10kW through the decompression below atmospheric pressure. The performance of the scroll expander and the overall system was examined and compared with our previous experiment in which the system was generated by an electric boiler. The scroll expander efficiency was about 20% and the cycle efficiency became a low value of 1.9%, in which the scroll expander generated the power of 38.9W at the revolution speed of 1500rpm. This is caused by an increase both of the leakage loss and of the effect of the mechanical loss.
2013-04-00