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Microchannel Reformer for Micro Fuel Cell
S.P.Yu(유상필),S.D.Lim(임성대),Y.K.Yoon(윤영기),W.Y.Lee(이원용),C.S.Kim(김창수) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Micro PEMFC(Proton Exchange Membrane Fuel Cell) needs to be supplied with high purity hydrogen to produce electricity. Each microstructured stainless steel foil for the purpose of micro reformer was brazed in vacuum for stacking. Inner surface of micro channels was coated with Al₂O₃ layer to support reforming catalysts by sol-gel method. The stack reactor was designed like a heat exchanger to perform the combination of exothermic and endothermic reactions simultaneously. As the first step in our study, we measured experimentally the heat transfer rate and the conversion of the reaction in the channels. The combustion heat of LPG-air was transferred to the other channels where cold air flowed. As a consequence, quantitative and qualitative thermal characteristics of the stack for reaction were investigated.
유상필(S. P. Yu),엄석기(S. Um),박구곤(G. G. Park),김민진(M. J. Kim),임성대(S. D. Yim),조중원(J. W. Cho),이원용(W. Y. Lee),김창수(C. S. Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
PEMFC(polymer electrolyte membrane fuel cell) is a promising solution for H₂ energy society. Especially, residential PEMFC system has been developed competitively for its relatively easier proliferation with existing natural gas supply network. We have developed 1㎾ residential PEMFC system with natural gas reformer and tested for its performance and endurability corroboratively.
유상필(S.P. Yu),정남조(N.J. Jeoung),이승재(S.J. Lee),류인수(I.S. Ryu),강성규(S.K. Kang),송광섭(K.S. Song) 한국에너지학회 2004 한국에너지공학회 학술발표회 Vol.2004 No.-
Compared to conventional flame combustion. catalytic combustion had the advantage of oxidation of V.O.C. gas which was high voluminous, low caloric mixture flow. However, the temperature of mixture gas should be over the one of catalytic reaction start and the control of reaction on the catalytic surface tends to be vulnerable. To overcome these obstacles, composition of both catalytic combustor and heat exchanger was devised and named the sequential catalytic combustion system. In this system, only trigger unit needed preheating process for transient starting time. Once trigger unit was ignited, the next unit was supplied heat to ignite from that and same process was performed to the last one sequentially. When it come to steady state, whole mixture gas was oxidated at each unit simultaneously and preheating for trigger unit was not needed any more. System of 100 kcalh/hr capacity was devised and operated successfully.
김동하(D.-H. Kim),함미숙(M.-S. Ham),김민진(M. Kim),유상필(S. P. Yu),엄석기(S. Um),이원용(W.-Y. Lee),김창수(C.-S. Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The fuel cell for a submarine is a closed system and therefore the unreacted hydrogen and oxygen are supposed to be recycled and reused. Generally, the compressors, the blowers, the pumps and the ejectors have been used as the recirculation equipment of a fuel cell system. In case of the vehicle application, the ejector which does not require any parasitic power is good for the performance of the fuel cell system. The ejector has been applied to a solid oxide fuel cell (SOFC) from now on. In case of SOFC, the ejector is designed to maintain the pressure required in fuel cell by compensating the pressure drop in the anode channel. However, the existing research works do not consider about the humidified hydrogen and oxygen which is occurred by electrochemical reaction at proton exchange membrane fuel cell (PEMFC). Unlike dry air, the humidified hydrogen and oxygen shows very complex behaviours in suction chamber and constant-area section. In this study, the ejector for the PEMFC used to the submarine is designed taking into account the property of the gas mixed with vaporized water and hydrogen/oxygen. Consequently, the designed ejector shows the optimal performance within the predefined operating conditions at the PEMFC for a submarine.