TED-AJ03-322 ANALYSIS OF INTERNAL PROCESSES AND EXERGY LOSSES IN A SOLID OXIDE FUEL CELL (SOFC)
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概要
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A solid oxide fuel cell (SOFC) has been expected to be applied to the distributed energy systems due to its high efficiency and exhaust heat utilization. The high temperature exhaust heat from the SOFC can be transformed to the electric power by a micro gas turbine. The high efficiency power generation can be obtained by combining the SOFC with the gas turbine. In this paper, we analyzed the local processes of the mass diffusion, heat transfer, electrode reactions and transport of the electron and the oxygen ion in the electrodes and electrolyte of the SOFC. The effects of the operating conditions on the thermal efficiency are evaluated. The concentration and temperature distributions perpendicular to the electrolyte membrane in the electrodes and electrolyte are also shown. Furthermore, the exergy loss in the SOFC of the SOFC and gas turbine combined system is evaluated using the exergy analysis. [figure] The SOFC configuration investigated in this study is shown in Fig. A-1. The numerical analysis of the internal processes is based on the conservation equations of mass and energy and the electrochemical fundamental equations. The results showed that the performance of the SOFC is affected by the temperature, pressure, gas concentration, current density and electrolyte thickness. If the O_2 mole fraction becomes small to some extent, the pre-determined current density cannot be sustained. The main cause of the irreversible loss in the SOFC is the activation polarization at the electrodes. Figure A-2 shows the flow scheme of the SOFC and gas turbine combined system. The exergy loss of the SOFC occupies about 10% of the exergy of the fuel required for the SOFC/GT combined system. It is less than the half of the exergy loss in the usual combustor of the gas turbine systems.[figure]
- 一般社団法人日本機械学会の論文
著者
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Kinoshita Shinichi
Department of Medicine, Division of Diabetes, Metabolism, and Endocrinology, Kobe University Graduat
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Kinoshita Shinichi
Department Of Fermentation Technology Faculty Of Engineering Osaka University
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Kinoshita Shinichi
Department Of Mechanophysics Engineering Graduate School Of Engineering Osaka University
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Takagi Toshimi
Department Of Mechanophysics Engineering Osaka University
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Takagi Toshimi
Department Of Mechanical Engineering Faculty Of Engineering Osaka Sangyo University
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NISHIDA Kousuke
Research Center for Carbon Recycling and Energy, Tokyo Institute of Technology
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NISHIDA Kousuke
Department of Mechanophysics Engineering, Osaka University
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YAMADA Daien
Department of Mechanophysics Engineering, Osaka University
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Takagi Toshimi
Department Of Mechanical Engineering Alty Of Engineering. Osaka University
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Yamada Daien
Department Of Mechanophysics Engineering Osaka University
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Takagi Toshimi
Osaka University Department Of Mechanophysics Engineering
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Nishida Kousuke
Research Center For Carbon Recycling And Energy Tokyo Institute Of Technology
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Kinoshita Shinichi
Department Of Chemical Process Engineering Faculty Of Engineering Hokkaido University
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Kinoshita Shinichi
Osaka University Department Of Mechanophysics Engineering
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