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PEMFC/GT 하이브리드 시스템의 부분부하 성능 해석
지승원(Seung Won Ji),유병준(Byung June You),김동섭(Tong Seop Kim),손정락(Jeong Lak Sohn),안국영(Kook Young Ahn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The paper addresses off-design analysis of a hybrid fuel cell system integrating a low temperature polymer electrolyte membrane fuel cell(PEMFC) with a gas turbine(GT). The system is a pressurized one where the working pressure of the PEMFC is higher than ambient pressure. In addition to the two major components, the system also includes auxiliary parts such as a steam reformer, a humidifier, and afterburner and so on. Based on design analysis, component off-design models are incorporated in the analysis program and part load operation is simulated. The mode for the part load operation of the PEMFC/GT hybrid system is a variable rotational speed operation. The operating line, the system efficiency and important component performance parameters at part load are analysed in depth. This study show that as load decreases, the part load efficiency generally increases.
공기공급계통과의 연계를 고려한 고분자 전해질형 연료전지의 성능해석
지승원(Seung Won Ji),김동섭(Tong Seop Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The PEMFC is a promising candidate for replacing or at least combining with the internal combustor engine of vehicles. In addition to the PEMFC, a full power generation system should include various BOP components. A careful design and operation of the entire system considering the matching between those components and the PEMFC are quite critical for the system performance and operating reliability. Among others, air supply unit, which is made up of a turbo-blower and a humidifier should supply well-conditioned air to the cell stack, is the most important component. In this paper, performance analysis of a PEMFC system coupled with an air supply unit is carried out. The cell stack operation model is validated. A shell-and-tube type membrane humidifier is assumed and the performance prediction model is validated. The operation of the blower is modeled by a performance map. Performance variations of the PEMFC system to various operating parameter changes are investigated.
지승원(Seung Won Ji),박성구(Sung Ku Park),김동섭(Tong Seop Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.10
고온형 연료전지인 MCFC 발전시스템에 가스터빈, 유기매체 랜킨 사이클, 순산소 연소 사이클 등 다양한 하부 사이클을 추가한 통합시스템들의 성능을 비교 해석하였다. MCFC 시스템의 성능과 운전조건을 바탕으로 하여 각 추가 시스템의 주요 설계 변수 변화에 따른 통합시스템의 성능 변화를 해석하였고 이로부터 각 시스템의 최적 성능을 도출하였다. 각 시스템을 비교하여 MCFC와 최적의 결합을 나타내는 시스템을 분석하였는데, MCFC/OXY 시스템이 MCFC 단독 시스템에 비하여 가장 큰 출력 증가를 나타내었으며, MCFC/GT 시스템의 효율 증가가 가장 큰 것으로 나타났다. Integration of various bottoming cycles such as the gas turbine (GT) cycle, organic Rankine cycle, and oxy-fuel combustion cycle with an molten carbonate fuel cell (MCFC) power-generation system was analyzed, and the performance of the power-generation system in the three cases were compared. Parametric analysis of the three different integrated systems was carried out under conditions corresponding to the practical use and operation of MCFC, and the optimal design condition for each system was derived. The MCFC/oxy-combustion system exhibited the greatest power upgrade from the MCFC-only system, while the MCFC/GT system showed the greatest efficiency enhancement.
하이브리드형 고분자전해질 연료전지 시스템의 부분부하 성능해석
지승원(Seung Won Ji),유병준(Byung June You),김동섭(Tong Seop Kim),손정락(Jeong Lak Sohn),이영덕(Young Duk Lee),안국영(Kook Young Ahn) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.11
The paper addresses modeling and analysis of the part load performance of a hybrid fuel cell system integrating a polymer electrolyte membrane fuel cell(PEMFC) and a gas turbine(GT). The system is a pressurized one where the working pressure of the PEMFC is higher than the ambient pressure. In addition to the two major components, the system also includes auxiliary parts such as a steam reformer, a humidifier, and afterburner and so on. Based on design analysis, component off-design models are incorporated in the analysis program and part load operation is simulated. The mode for the part load operation of the PEMFC/GT hybrid system is a variable rotational speed operation. The operating characteristics and variations in the system efficiency and component performance parameters at part load are analyzed.