• 대한기계학회논문집B
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• 제34권4호
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• pp.341-347
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• 2010

본 연구에서는 부탄 개질기 운전조건에 따른 SOFC 시스템 효율을 모델링을 통해 분석하였다. SOFC 시스템은 크게 개질기, SOFC, 폐열 회수 장치로 구성하였다. 탄화수소 개질 반응으로 선택한 수증기 개질 반응은 흡열반응인 데에 반해 SOFC 에서 일어나는 전기화학반응은 발열반응이다. 따라서 시스템의 열관리 방법에 따라 효율이 크게 달라진다. 세부적으로 수증기 개질 반응은 운전 온도에 따라 수증기 개질 반응과 예개질 반응으로 분류되는데, 해석 결과 예개질 반응을 적용한 SOFC 시스템의 경우 더 높은 효율을 나타내었다. 시스템의 효율은 SOFC 온도 유지를 위한 열량과 온수로 회수되는 열량에 따라 달라지는데, 예개질 반응을 적용할 경우, 열관리가 더욱 효율적이어서 높은 효율을 나타내는 것으로 분석되었다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 제17회 워크샵 및 추계학술대회
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• pp.552-552
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• 2005

• 한국세라믹학회지
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• 제45권12호
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• pp.772-776
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• 2008

The Korea Electric Power Research Institute (KEPRI) has been developing planar solid oxide fuel cells (SOFCs) and power systems for combined heat and power (CHP) units. The R&D work includes solid oxide fuel cell (SOFC) materials investigation, design and fabrication of single cells and stacks, and kW class SOFC CHP system development. Anode supported cells composed of Ni-YSZ/FL/YSZ/LSCF were enlarged up to $15{\times}15\;cm^2$ and stacks were manufactured using $10{\times}10\;cm^2$ cells and metallic interconnects such as ferritic stainless steel. The first-generation system had a 37-cell stack and an autothermal reformer for use with city gas. The system showed maximum stack power of about $1.3\;kW_{e,DC}$ and was able to recover heat of $0.57{\sim}1.2\;kW_{th}$ depending on loaded current by making hot water. The second-generation system was composed of an improved 48-cell stack and a prereformer (or steam reformer). The thermal management subsystem design including heat exchangers and insulators was also improved. The second-generation system was successfully operated without any external heat source. Under self-sustainable operation conditions, the stack power was about $1.3\;kW_{e,DC}$ with hydrogen and $1.2\;kW_{e,DC}$ with city. The system also recuperated heat of about $1.1\;kW_{th}$ by making hot water. Recently KEPRI manufactured a 2kW class SOFC stack and a system by scaling up the second-generation 1kW system and will develop a 5kW class CHP system by 2010.