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김홍건,곽이구,Kim, Hong-Gun,Kwac, Lee-Ku 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.2
Hydrox gas which is the mixed gas of hydrogen and oxygen gained fromwater electrolysis is one of the new clean energy sources and thus is researched and commercialized actively. Especially, it can be replaced the fossil energy and shows the better quality compared to the conventional energy such as LPG or acetylene gas. The mixed gas of hydrogen and oxygen is gained from water electrolysis reaction. It has constant volume ratio 2:1 of hydrogen and oxygen, and it is used as a source of thermal energy by combustion reaction. Further, hydrox gas is nearly a mixed ideal gas combusting itself completely and its combustion shows anunique characteristics of implosion. In this study, temperature rise effects on hydrox gas content through mixed combustion test of kerosene and hydrox gas and LPG and hydrox gas are investigated. it is also confirmed that economy of mixed combustion of hydrox gas as effective energy is fairly probable.
Hydrox Gas 절단과 LPG 절단의 열적특성에 관한 연구
김홍건,곽이구,Kim, Hong-Gun,Kwac, Lee-Ku 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.2
Cutting procedures where qualities are determined by various demand factors largely influences shipbuilding productivity. Particularly, defects in cutting shapes and cutting surface results in delay for post shipbuilding stages such as in welding and assemblage lines which could become factors for reduced economic viability of the project. Existing cutting procedures utilize fossil fuels such as propane or ethylene as the main fuel component and these methods applied particularly to ship plate cutting gives relatively slow cutting speed and generates large quantities of harmful and sometimes poisonous polluting fumes of which warrants an urgent need to look for alternative cutting methods. Recent introduction of hydrox gas generated by electrically dissociating water into hydrogen and oxygen components to be utilize as an alternative cutting fuel has resulted not just in visible improvement on cutting quality and speed over the existing methods but it has also been welcomed as an environmentally friendly clean fuel source. This paper has been prepared to serve as the basis for accommodating this environmentally friendly hydrox gas cutting method into actual working environment by observing and recording hydrox gas cutting thermal characteristics.
고분자전해질형 연료전지의 성능해석 및 효율에 관한 연구
김홍건(Hong-Gun Kim),김유신(Yoo-Shin Kim),양성모(Sung-Mo Yang),나석찬(Seok-Chan Nah) 한국생산제조학회 2005 한국생산제조학회지 Vol.14 No.4
An experimental study is carried out to investigate the performance and the efficiency humidifying Membrane Electrolyte Assembly and having the double-tied catalyst layers in a fuel cell system which is taken into account the physical and thermal concept. Subsequently, an electric output produced by PEMFC(Polymer Electrolyte Membrane Fuel Cell) is measured to assess the performance of a stack, and the efficiency is also evaluated according to the different situation in which unit cell is placed with and without the humidification of the MEA. It is found that the measured values of stack voltage and current are influenced by the stack temperature, humidification, and the double-tied catalyst layers which give more enhanced values to be applied to electric units.
김홍건(Kim, Hong-Gun),강성수(Kang, Sung-Soo),곽이구(Kwac, Lee-Ku),강영우(Kang, Young-Woo) 한국신재생에너지학회 2006 신재생에너지 Vol.2 No.2
An experimental and numerical study is carried out to investigate the performance and the efficiency humidifying Membrane Electrolyte Assembly and having the double-layered catalyst in a fuel cell system which is taken into account the physical and thermal concept. Based on the principals of the problem, the equation of electronic charge conservation equation, gas-phase continuity equation, and mass balance equation are used for the numerical calculation. A unit cell for 200cm² MEA is assembled and measured for finding better operational situation. After finding the optimal condition, 10 cell stacked PEMFC is fabricated. For the performance evaluation, V-I and power curves are examined in detail by changing the condition of humidity, temperature, pressure, thickness of catalyst and oxidant. It is found that the power is maximized around 500W at 80A.
DMFC에서 온도 및 유량이 성능에 미치는 영향에 관한 연구
김홍건(Kim, Hong-Gun),곽이구(Kwac, Lee-Ku),강영우(Kang, Young-Woo),김태진(Kim, Tae-Jin),곽상희(Kwak, Sang-Hee),안계혁(An, Kay-Hyeok),박경세(Park, Gyung-Se) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
직접메탄올형 연료전지(Direct Methanol Fuel Cell)는 휴대용으로 사용할 수 있는 소형 전원용으로 주로 개발되고 있으며, 다양한 용도로 사용이 가능하다. 하지만 직접메탄올연료전지에서 전해질로 많이 쓰이는 Nafion막은 이를 통한 메탄올 크로스오버(Crossover) 때문에 연료전지의 성능을 제한시키고 있다. 본 연구에서는 Nafion 117를 사용하여 전극 면적 100cm2 의 DFMC용 MEA를 제작하고, 공기 유량을 3ml/mim으로 고정하고, 메탄올 유량을 2,3 ml/min로 각각 공기극와 연료극에 공급하여 온도변화(50, 60, 70, 80?C)에 따른 성능을 확인하였다. DMFC의 적당 반응 온도는 70?C로 생각되고, 유량은 메탄올 2ml/min, 공기 3ml/min유량 공급시가 성능이 높게 나오는 결과를 얻으나 일정시간 지나면 성능이 메탄올 3ml/min, 공기 3ml/min유량 공급시 보다 성능이 떨어지는 현상이 일어나기 때문에 70?C 반응온도에 메탄올 3ml/min, 공기 3ml/min의 유량 공급이 본 논문에서 최적화된 성능을 내는 조건으로 사료된다.