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수치해석을 이용한 탄화수소연료 고체산화물연료전지 스택의 열 및 물질 전달 분석
이상혁(Sanghyeok Lee),배용균(Yonggyun Bae),윤경중(Kyung Joong Yoon),이종호(Jong-Ho Lee),최원준(Wonjoon Choi),홍종섭(Jongsup Hong) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
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..