An anode gas recycle system using an ejector for 1 kW solid oxide fuel cells (SOFCs) was developed to increase the electrical efficiency of combined power generation. We call this an AGR-SOFC (anode gas recycle-solid oxide fuel cell). The effects of recirculation ratio, externally steam feed rate, and fuel utilization were determined experimentally on the AGR-SOFC performance (i.e., output power, stack temperature and gas composition) using a variable flow ejector and a recirculation ratio of 0.55–0.62, overall fuel utilization of 0.72–0.84, and steam feed rate of 0–1.5 g/min. A quadrupole mass spectrometer was used to identify the recirculation ratio, the gas composition of reformed gas at the AGR-SOFC inlet, and that of the recycle gas at the outlet. Compared to one-path SOFC systems i.e. without an anode gas recycle, the AGR-SOFC was stable and generated about 15 W more electricity when the overall fuel utilization was 0.84 and the recirculation ratio was 0.622 with no steam supply. This improved performance was due to the reduced H2O concentration in the anodic gas. In addition, although the recirculation ratio did not affect the AGR-SOFC performance, a high recirculation ratio can provide steam produced via the electrochemical reaction to the injected fuel for the steam reforming process.
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ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
June 16–20, 2014
Düsseldorf, Germany
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4565-3
PROCEEDINGS PAPER
Development of Anode Gas Recycle System Using Ejector for 1 KW Solid Oxide Fuel Cell
Soumei Baba,
Soumei Baba
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
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Nariyoshi Kobayashi,
Nariyoshi Kobayashi
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
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Sanyo Takahashi,
Sanyo Takahashi
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
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Satoshi Hirano
Satoshi Hirano
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
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Soumei Baba
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
Nariyoshi Kobayashi
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
Sanyo Takahashi
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
Satoshi Hirano
National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan
Paper No:
GT2014-25585, V03AT07A013; 11 pages
Published Online:
September 18, 2014
Citation
Baba, S, Kobayashi, N, Takahashi, S, & Hirano, S. "Development of Anode Gas Recycle System Using Ejector for 1 KW Solid Oxide Fuel Cell." Proceedings of the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. Volume 3A: Coal, Biomass and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration. Düsseldorf, Germany. June 16–20, 2014. V03AT07A013. ASME. https://doi.org/10.1115/GT2014-25585
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