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Exergy analysis of the woody biomass Stirling engine and PEM-FC combined system with exhaust heat reforming |
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| Authors: | Shin&#x;ya Obara Itaru Tanno Shunsuke Kito Akira Hoshi Seizi Sasaki |
| Affiliation: | aDepartment of Mechanical Engineering, Tomakomai National College of Technology, 443 Nishikioka, Tomakomai, Hokkaido 0591275, Japan bDepartment of Mechanical Engineering, Toyota National College of Technology, Eisei-cho, 2-1 Toyota, Aichi 4718525, Japan cDepartment of Mechanical Engineering, Ichinoseki National College of Technology, Takanashi, Hagisho, Ichinoseki, Iwate 0218511, Japan |
| Abstract: | The woody biomass Stirling engine (WB-SEG) is an external combustion engine that outputs high-temperature exhaust gases. It is necessary to improve the exergy efficiency of WB-SEG from the viewpoint of energy cascade utilization. So, a combined system that uses the exhaust heat of WB-SEG for the steam reforming of city gas and that supplies the produced reformed gas to a proton exchange membrane fuel cell (PEM-FC) is proposed. The energy flow and the exergy flow were analyzed for each WB-SEG, PEM-FC, and WB-SEG/PEM-FC combined system. Exhaust heat recovery to preheat fuel and combustion air was investigated in each system. As a result, (a) improvement of the heat exchange performance of the woody biomass combustion gas and engine is observed, (b) reduction in difference in the reaction temperature of each unit, and (c) removal of rapid temperature change of reformed gas are required in order to reduce exergy loss of the system. The exergy efficiency of the WB-SEG/PEM-FC combined system is superior to EM-FC. |
| Keywords: | Exergy analysis Stirling cycle Distributed power supply PEM fuel cell Biomass Combined cycle Exhaust heat reforming |
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