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윤경중 ( Kyung Joong Yoon ),지호일 ( Ho-il Ji ),김형철 ( Hyoungchul Kim ),손지원 ( Ji-won Son ),이종호 ( Jong-ho Lee ),김병국 ( Byung-kook Kim ),이해원 ( Hae-weon Lee ) 한국공업화학회 2018 공업화학전망 Vol.21 No.5
고체산화물연료전지(SOFC)는 전기화학반응을 통하여 연료의 화학에너지를 전기에너지로 변환하는 전력생산장치로서 다양한 연료전지 가운데 가장 높은 온도에서 작동한다. 이 때문에 높은 발전효율, 연료 자율성, 양질의 열 발생 등 고유한 장점을 지니지만 또한 고온에서 특징적으로 발생하는 열화 현상 때문에 신뢰성을 확보하는 것이 어려워서 상용화가 지연되고 있다. SOFC의 고온 열화 현상은 매우 복잡하고 다양한 요인에 의하여 영향을 받기 때문에 제품화를 위한 수명을 확보하기 위해서는 근본적인 원인을 정확히 이해하고 최적화된 대응책을 마련하는 것이 반드시 필요하다. 본 원고에서는 단전지와 스택의 구성요소별로 주요한 열화 현상을 정리하고 열화억제기술 개발 및 수명 연장을 위한 최근 연구 동향을 조사하였다.
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..