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학술대회자료
저자정보
이상혁 (한국과학기술연구원) 배용균 (연세대학교) 윤경중 (한국과학기술연구원) 이종호 (한국과학기술연구원) 최원준 (고려대학교) 홍종섭 (연세대학교)
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2018년도 학술대회
발행연도
2018.12
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1,305 - 1,308 (4page)

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Numerical studies were carried out to observe the uneven physical phenomena occurring in the SOFC stacks with high fuel utilization and cross-flow conditions. In the preliminary study, a high fidelity physics model was developed and validated. In this study, we applied the simplified model to simulate all the components of the SOFC stack under crossflow conditions. As a result of the simulation, it was observed that the current in the SOFC electrolyte associated with the electrochemical reaction was formed very non-uniformly. At this time, the hydrogen was unevenly consumed by the electrochemical reaction, and the hydrogen was supplied by the thermochemical reaction, that is, the methane reforming and the water-gas shift reaction. Most of the methane was reformed at the anode support where no cathode was present and no electrochemical reaction occurred. The hot spot was formed near the outlet of the air and near the middle of the fuel, and the temperature of the hot spot was formed to be 80 ° C higher than the inlet temperature of 700 ° C. The gas pressure at the interface between the electrolyte and the electrode was largely formed in the thick anode, and the pressure distribution was determined along the electrochemical reaction distribution. Shear stress is generated in the electrolyte depending on the gas pressure gradient, which lowers the durability of the electrolyte. Due to the high operating temperature and high fuel utilization rate, the electrochemical reactant, hydrogen, is depleted very quickly, and thus the non-uniformity of the electrochemical reaction is observed. Because of these non-uniformities of physics are related to each other, and the degradation of the SOFC stack is mainly due to the electrochemical reaction and the temperature distribution..

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Abstract
1. 서론
2. 수치해석기법
3. 결과
4. 결론
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