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디젤 자열개질기를 위한 가압식 연료탱크와 기화기에 의한 연료공급
최원영(Won Young Choi),성연백(Yeon Baek Seong),박노국(No-Kuk Park),이태진(Tae Jin Lee),이상태(Sang Tae Lee) 한국에너지기후변화학회 2015 에너지기후변화학회지 Vol.10 No.1
본 연구에서는 디젤과 같은 액상 탄화수소 연료의 자열 개질에 의한 수소생산용 개질기에 적용 가능한 연료공급기의 분사특성이 조사되었다. 디젤 자열 개질을 위한 연료공급기는 연료물질인 액상의 탄화수소와 스팀 그리고 공기를 공급하기 위한 장치이며, 액상의 연료는 개질기의 촉매층에 공급되기 위해서 증기상태로 상전이 되어야 한다. 그러므로 액상의 연료물질인 디젤과 수분은 증기화를 위하여 가열되어야 하며, 공기와 함께 균일 상으로 개질기에 공급되어야 한다. 본 연구에서는 연료공급기를 연료탱크, 연료공급량 조절을 위한 밸브, 열교환식 가열장치 그리고 분사노즐로 구성하였다. 연료의 분사량 조절은 가압식 연료탱크의 압력과 밸브를 이용하여 조절하였으며, 열교환식 가열장치의 가열온도와 연료공급량에 따라 분사노즐의 분사형태가 달라짐을 확인하였다. 그러므로 가압연료탱크와 밸브 그리고 액상연료의 가열로부터 개질연료의 안정적인 공급이 가능하다고 판단된다. In this study, the spraying property of fuel supplyer was investigated for the production of hydrogen by autothermal reforming (ATR) of liquid hydrocarbon such as diesel fuel. The fuel supplyer was used in order to provide liquid fuel, steam and air used as the reactants for ATR. The flow rate of these reactants was controlled with the reaction condition and the reactants should be provided to vapor phase into ATR reactor. Therefore, liquid fuel and water were heated for their vaporization, and were mixed with the pre-heated air before the providing to ATR reactor. The fuel supplyer developed in this study was consisted of the pressurized fuel-tank, fine-adjustable valve, the heat-exchanger and spray nozzle. The flow rate of liquid fuel was controlled by the fine-adjustable valve and pressure in the pressurized fuel-tank. It was confirmed that the spraying property was changed with the flow rate of liquid fuel and temperature of vaporizer by heat-exchanger. Therefore, it was concluded that the reactants for ATR can be stable provided by the control of pressure in liquid fuel-tank and fine-adjustable valve and the heating of liquid fuel by the heat-exchanger.
산화아연 촉매 상에서 메탄올-요소 반응계로부터 DMC합성을 위한 표면적의 영향
지찬태(Chan Tae Ji),박노국(No-Kuk Park),김용술(Yong Sul Kim),최희영(Hee-Young Choi),성연백(Yeon Baek Seong),이태훈(Tae Hoon Lee),이태진(Tae Jin Lee),강석환(Kang Suk Hwan) 한국에너지기후변화학회 2014 에너지기후변화학회지 Vol.9 No.1
The synthesis of di-methyl-carbonate (DMC) with urea and methanol occurred by two step reactions. In first step, methyl-carbamate (MC) is produced by the reaction between urea and methanol. In second step, DMC is synthesized by the catalytic reaction between MC and methanol over the catalyst. In this study, ZnO was used as the catalyst for the synthesis of DMC and the reaction behavior for the synthesis of DMC over ZnO catalysts, which have a different surface area, was investigated. The surface area of ZnO was controlled with the change of calcination temperature and that calcined at with 400℃ was 27㎡ /g. Meanwhile, the yield of products was investigated with the reactionconditions, such as the temperature, the pressure, the time, the amount of catalyst and the agitation speed. The yield of DMC was changed with changing reaction conditions. It was also concluded that the production of N-methyl-methyl-carbamate (N-MMC), which is the by-product produced by the reaction between MC and DMC, taken affected in the yield of DMC. The maximum yield of DMC was obtained to approximately 23.9% in the test under the suitable reaction conditions, which was performed with 1 gram of catalyst at 175℃, 25 bar and 600 rpm for 10 h. The yield of DMC increased with the increase of catalyst’s surface area, while the changing surface area of catalyst was exhibited the little effect for the production of N-MMC.