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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..
박진영(JIN YOUNG PARK),쿠엔(THAI-QUYEN QUACH),김진선(JINSUN KIM),배용균(YONGGYUN BAE),이동근(DONGKEUN LEE),김영상(YOUNGSANG KIM),이선엽(SUNYOUP LEE),김영(YOUNGSANG KIM) 한국수소및신에너지학회 2024 한국수소 및 신에너지학회논문집 Vol.35 No.1
Ammonia is drawing attention as carbon free fuel due to its ease of storage and transportation compared to hydrogen. This study suggests ammonia fueled solid oxide fuel cell (SOFC) system with electrochemical hydrogen compressor (EHC)-based recirculation. Performance of electrochemical hydrogen pump is based on the experimental data under varying hydrogen and nitrogen concentration. As a result, the suggested system shows 62.04% net electrical efficiency. The efficiency is 10.33% point higher compared to simple stand-alone SOFC system (51.71%), but 0.02% point lower compared to blower-based recirculation system (62.06%). Further improvement in the EHC-based SOFC recirculation system can be achieved with EHC performance improvement.
박진영(JIN YOUNG PARK),뚜안앵(TUANANH BUI),박승용(SEUNGYONG PARK),이동근(DONGKEUN LEE),배용균(YONGGYUN BAE),김영상(YOUNGSANG KIM),이상민(SANG MIN LEE) 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.6
This study proposes polymer electrolyte membrane fuel cell (PEMFC) based cogeneration system for greenhouse heating and cooling. The main scope of this study is to examine the proposed cogeneration system’s suitability for the 660 ㎡-class greenhouse. A 25 kW PEMFC system generates electricity for two identical air-cooled heat pumps, each with a nominal heating capacity of 70 kW and a cooling capacity of 65 kW. Heat recovered from the fuel cell supports the heat pump, supplying hot water to the greenhouse. In cooling mode, the adsorption system provides cold water to the greenhouse using recovered heat from the fuel cell. As a result, the cogeneration system satisfies both heating and cooling capability, performing 175 and 145 kW, respectively.