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소형 용융탄산염 연료전지 스택의 운전 특성II : 200W급 같은 방향흐름형 스택의 운전 특성
Performance of s Small-Scale Molten Carbonate Fuel Cell Stack II : Performance of a 200W-Class Co-Flow Type Stack
HWAHAK KONGHAK, October 1996, 34(5), 651-657(7), NONE
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Abstract
전극 유효 면적이 100cm2인 단위 전지를 20단 적층한 200W급 내부분배형, 같은방향흐름형 MCFC 스택을 제작하여 성능 실험을 수행하였으며, 그 결과를 이전의 단위 전지 및 스택 실험결과와 비교해 보았다. 연료로 72%H2/18%CO2/10%H2O, 산화제로 70%공기/30%CO2를 사용했을 때 스택의 초기 성능은 전루 밀도 150mA/cm2(15A), 가스 이용률이 0.4인 조건에서 16.9V로 250W이상의 출력을 나타내어 선진국 수준의 성능을 얻는데 성공하였다. 스택의 전압 손실 요인을 분석한 결과 이전 스택에 비해 내부 저항 및 전극 분극에 의한 전압 손실 값이 크게 감소하여 요소 기술 및 적층 기술이 향상되었음을 확인하였다. 또한 각 단위 전지들의 성능 분포도 성능 편차가 14-33mV로 이전 스택에 비해 비교적 균일하였다. 그러나 연속 운전시 스택의 성능은 크게 감소하여 분리판의 내식성 향상 및 전극의 안정화를 통한 스택의 수명 향상이 요구되었다.
A 200W-class stack consisting of twenty molten carbonate fuel cells has been fabricated and tested to establish the basic technology for an intemally mani- folded stack. Each cell in the stack had an effective electrode area of 100cm2, and reactant gases were distributed in each cell in a co-flow configuration. The stack showed state-of-the-art performance; the stack voltage at a cu- rrent density of 150mA/cm2 and gas utilization of 0.4 was 16.9V producing an output of more than 250W using an anode gas of 72%H2/18%CO2/10%H2O and a cathode gas of 70%air/30%CO2. Compared with the performance of the previously-tested stack, the voltage loss due to the internal resistance and the electrode polarization became lower and the distribution of cell voltages be- came more uniform indicating that some improvements were made incompo- nent fabrication and cell stacking technology. The voltage of the stack, how- ever, decayed during the continuous operation at 150mA/cm2 and further works are required to enhance the life of the stack.
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Oh IH, Yoon SP, Lim TH, Nam SW, Hong SA, HWAHAK KONGHAK, 33(5), 640 (1995)
Oh IH, Yoon SP, Lim TH, Nam SW, Hong SA, Proceedings of the 2nd International Fuel Cell Conference, Yokohama, Feb., 5-8, 429 (1996)
