• Proceedings of the KWS Conference
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• 2001.10a
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• pp.132-133
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• 2001

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.34 no.11
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• pp.44-48
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• 2005

• Journal of Energy Engineering
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• v.8 no.1
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• pp.85-94
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• 1999

전력연구원에서 수행 중인 7 kW 용융탄산염형 연료전지 시스템의 운전 조건과 일치하는 모델을 in-Line FORTRAN 블록을 이용하여 상용 소프트웨어인 ASPEN PLUS로 전산 모사한 결과와 가스 크로마토그래피를 이용하여 분석한 실험적인 값을 비교 분석한 결과 실험치와 거의 일치함을 보였다. 향후 대형 시스템에서 사용하게될 가스 recycle을 위해서 연료극, 공기극의 가스를 recycle할 때와 연료극 가스를 catalytic burner를 이용하여 recycle하였을 때 연료의 전체적인 시스템의 효율 변화를 살펴보았다. 이러한 결과는 용융탄산염 연료전지 대형 시스템의 설계에 중요한 자료가 될 것이다.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1996.04a
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• pp.107-110
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• 1996

연료전지 발전방식중 용융탄산염형 연료전지 발전방식은 동작온도가 $650^{\circ}C$의 고온에서 동작되기 때문에 발전효율이 높고 석탄가스를 연료로 사용할 수 있으며 또한 배기가스를 이용하여 복합발전시스템으로 구성할 수 있는 등 전력사업에 적용가능성이 가장 큰 새로운 발전방식이다. 이와 같은 이유로 전력연구원에서 개발하고 있는 2kW급 용융탄산염형 스택은 전극유효면적이 1,000$ extrm{cm}^2$인 단위전지를 20단 적층한 Co Flow형 MCFC스택으로, 연료로, 연료극에 H2, CO2, H2O 혼합가스를 그리고 산소극에는 공기, CO2 혼합가스를 이용하여 150A 정부하 상태에서 초기성능이 전압 14.28V, 출력 2.142W의 발전 운전시험에 성공하였고 이때 스택의 단위전지 평균전압은 0.714V를 나타내었다.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.38 no.8
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• pp.677-685
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• 2014

A direct carbon fuel cell (DCFC) generates electricity directly by converting the chemical energy in coal. In particular, a DCFC system with a solid oxide electrolyte and molten carbonate anode media has been proposed by SRI. In this system, however, there are conflicting effects of temperature, which enhances the ion conductivity of the solid electrolyte and reactivity at the electrodes while causing a stability problem for the anode media. In this study, the effect of temperature on the stability of a carbon-carbonate mixture was investigated experimentally. TGA analysis was conducted under either nitrogen or carbon dioxide ambient for $Li_2CO_3$, $K_2CO_3$, and their mixtures with carbon black. The composition of the exit gas was also monitored during temperature elevation. A simplified reaction model was suggested by considering the decomposition of carbonates and the catalyzed Boudouard reactions. The suggested model could well explain both the measured weight loss of the mixture and the gas formation from it.

• 한국전기화학회:학술대회논문집
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• 2002.10a
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• pp.3-4
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• 2002

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.82.2-82.2
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• 2011

A channel design which is closely related with the mass transport overpotential is one of the most important procedures to optimize the whole fuel cell performance. In this study, three dimensional results of a numerical study for gas distribution in channels of a molten carbonate fuel cell (MCFC) unit cell for a 1kW class stack was presented. The relationship between the fuel and air distribution in the anode and cathode channels of the unit cell and the electric performance was observed. A charge balance model in the electrodes and the electrolyte coupled with a heat transfer model and a fluid flow model in the porous electrodes and the channels was solved for the mass, momentum, energy, species and charge conservation. The electronic and ionic charge balance in the anode and cathode current feeders, the electrolyte and GDEs were solved for using Ohm's law, while Butler-Volmer charge transfer kinetics described the charge transfer current density. The material transport was described by the diffusion and convection equations and Navier-Stokes equations govern the flow in the open channel. It was assumed that heat is produced by the electrochemical reactions and joule heating due to the electrical currents.

• 한국신재생에너지학회:학술대회논문집
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• 2008.05a
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• pp.53-56
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• 2008

An ejector is a fluid machinery to be utilized for mixing fluids, maintaining vacuum, and transporting them. The Ejector is applied for a variety of industrial fields such as refrigerators and power plants. It is adopted to recycle anode off gas safely in 5kW Molten Carbonate Fuel Cell system of KEPRI(Korea Electric Power Research Institute). The ejector is placed at mixing point between the anode off gas and the cathode off gas or the fresh air. In this study, the entrainment ratio is measured according to the diametrical ratio of nozzle to throat. In addition, the performance curve of the ejector and the differential pressure in diffuser is observed.

• 한국전기화학회:학술대회논문집
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• 2001.06a
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• pp.231-236
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• 2001

용융탄산염 연료전지용 anode의 creep 현상을 개선하기 위해 $Ni-5wt.\%Al$ green sheet를 사용하여 다양한 소결조건을 적용, $Al_2O_3$를 형성시킨 전극을 제조하고 그 $Al_2O_3$의 형태에 따른 creep 특성에 대해 연구하였다. 소결은 각각 환원분위기, 완전산화-환원분위기, 부분 산화-환원분위기의 서로 다른 분위기에서 진행하였는데, 부분산화-환원분위기로 소결한 경우 Ni-Al 고용체 네트워크를 깨드리지 않고 $A1_2O_3$를 미세한 입자형태로 분산시킬 수 있었다. 그리고, 상기의 방법으로 제조된 anode를 $650^{\circ}C$에서 100psi로 가압하면서 creep test를 실시한 결과 약 $2.3\%$의 변형율을 나타내었다.

• 한국전산유체공학회:학술대회논문집
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• 2004.10a
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• pp.141-144
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• 2004

An analysis procedure for the MCFC channel flow has been developed to predict the fuel cell performance. The channel formed by the uniformly distributed trapezoidal supports is approximated by the porous medium that yields the equivalent pressure drop. The Wavier-Stokes, energy, and species equations are solved to obtain the velocity, temperature and concentration fields for a local current density which is computed from electrochemical correlations. The fuel cell characteristics, such as the temperature, pressure, mole concentration, voltage and current density distributions, are presented and discussed.