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Effects of gas recycle on performance of solid oxide fuel cell power systems |
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| Authors: | Junxi Jia Qiang LiMing Luo Liming WeiAbuliti Abudula |
| Affiliation: | a College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China b School of Electric and Electronic Information Engineering, Jilin Architectural and Civil Engineering Institute, Changchun 130021, China c North Japan New Energy Research Center, Hirosaki University, Aomori 030-0813, Japan |
| Abstract: | An energy analysis of solid oxide fuel cell (SOFC) power systems with gas recycles fed by natural gas is carried out. Simple SOFC system, SOFC power systems with anode and cathode gas recycle respectively and SOFC power system with both anode and cathode gas recycle are compared. Influences of reforming rate, air ratio and recycle ratio of electrode exhaust gas on performance of SOFC power systems are investigated. Net system electric efficiency and cogeneration efficiency of these power systems are given by a calculation model. Results show that internal reforming SOFC power system can achieve an electrical efficiency of more than 44% and a system cogeneration efficiency including waste heat recovery of 68%. For SOFC power system with anode gas recycle, an electrical efficiency is above 46% and a cogeneration efficiency of 88% is obtained. In the case of cathode gas recycle, an electrical efficiency and a cogeneration efficiency is more than 51% and 78% respectively. Although SOFC system with both anode and cathode gas is more complicated, the electrical efficiency of it is close to 52%. |
| Keywords: | Solid oxide fuel cell Power system Gas recycle Electric efficiency |
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