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이택홍,김태완,박태성,강영진,노재현 한국수소및신에너지학회 2014 한국수소 및 신에너지학회논문집 Vol.25 No.2
Our lab designs a heat exchangers for air and carbondioxide gas. Coolant is water, thus it is verydifficult to determine heat transfer parameters in this gas-liquid system. Repeated experiments gives overdesignvalue 35%, overall heat transfer coefficient 33.8 (kcal/m2-hr-°C) for carbondioxide. Another series of experimentsdetermine overdesign 18.7%, overall heat transfer coefficient 21.4 (kcal/m2-hr-°C) for Air. These parameters arein same range of literature. Overdesign is increasing as tube length increases, also increases as wall thicknessof heat exchanger increases. To get proper fluid linear velocity in heat exchanger, we change the diameter oftube and finally we can have optimum fluid linear velocity in the heat exchanger.
이택홍,박태성,김태완,노재현,강영진 한국수소및신에너지학회 2014 한국수소 및 신에너지학회논문집 Vol.25 No.1
Our lab designs a heat exchangers for hydrogen gas. Coolant is water, thus it is very difficult todetermine heat transfer parameters in this gas-liquid system. Repeated experiments gives overdesign value 6.06%,overall heat transfer coefficient 36.32 (kcal/m2-hr-°C) for Hydrogen. Theoretically determined overall heat transfercoefficient is 38.44 (kcal/m2-hr-°C). Our lab simulated this system and overdesign 30.4% shows good match withthis experiment by HTRI. These parameters are in same range with literature.
수소와 불활성 가스 중 일산화탄소, 이산화탄소, 메탄 제거에 관한 연구 -연료전지에의 적용 가능성-
이택홍,천영기 한국수소및신에너지학회 2004 한국수소 및 신에너지학회논문집 Vol.15 No.3
The purpose of this paper is, based on the theoretical background of the principle of gas purification and absorption, and the absorbing ability of metals, to syudy the efficiency of gas purification of inorganic gases using Zr alloys, so as to contribute to the IT industry. To produce and distribute gas with high purity and ultra-high purity, different types of gas purifier are currently being used: distillation type, getter type, catalyst type, absorption at low-temperature type, and membrane separation equipment. From the different purification methods mentioned above, the getter type gas purifier is capable of not only high performance and capacity but also P.O.U(Point Of Use) method. The key of the getter type gas purifier is its efficiency of gas purification, which is the subject chosen for this study.
이택홍,김재영,장세훈,이효석,최익환 한국수소및신에너지학회 2010 한국수소 및 신에너지학회논문집 Vol.21 No.1
This paper is studying the selective separation of methane and carbon dioxide which are the main ingredients of biogas. Adsorption performance of molecular sieve 13x for carbon dioxide seems to be reasonable. In this experiments carbon dioxide contains about 3~5 ppm of methane and it is impossible to obtain high purity carbon dioxide. Applying the low temperature technique, it is possible to separate methane and carbon dioxide from bio gas. PRO II simulation shows results a small change of liquefaction temperatures and no difference with the used thermodynamic models. Applying low temperature technique, It is possible to separate carbon dioxide and methane from biogas.
이택홍,최운선 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.5
This work is for the design study of natural gas reformer (40 m3/hr over). We used experimental kinetic data from literature. After that, we set up theoretical model based on experimental reaction kinetic data. The shape of reactor is 1.7 m long and 200 mm dia. with cylinder geometry. Volume of reactor is 53.4 liter. Average flow velocity of gases in the reactor has been determined 0.272 m/sec and residence time is 9.26 sec. Reaction temperature is 850℃, with pressure 9.3 Bar. Used natural gas volume is about 9.21 m3/hr. Produced hydrogen is 43.7 m3/hr with no change of pressure. Unreacted natural gas is 0.09 m3/hr and the amount of steam is 26.9 m3/hr. Steam to CH4 (s/c ratio) is 2.91. Reforming reaction take place from the reactor entrance to 120cm region of cylinder type reactor. After the entrance of reacting gases to 120 cm region, the reaction reaches equilibrium which is close to products. This study can be applicable to design various reactors. Output data is in good agreements with the data in literatures1).
이택홍,천영기 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.4
In the production of hydrogen from various sources like cracking of LPG, LNG, Crude oil, or alkaline water electrolysis, the things that we keep in mind is the entrapment of unexpected impurities in the stream of produced H2. If it is true that we are not able to produce 100% pure H2, then subsequent procedure is the elimination of the impurities and the determination of the concentrations of each constituents in H2 stream. By the way, each country has different constituents in its fuels and unavoidablely it was cost/economy debates between coutries. Thus, in this paper, our goal is to provide current international issues for hydrogen production.
이택홍,김재영,Lee, Taeck-Hong,Kim, Jae-Young 한국가스학회 2011 한국가스학회지 Vol.15 No.3
$BF_3$ gas has been used for semiconductor manufacturing process and applied in plasma etching, chemical vapor deposition, chamber cleaning processes etc,. $BF_3$ provides Boron and acts as a p-type doping in electrode in semiconductor. In this study, we investigate thermaldecomposition of alkali-boron complexes and suggest a simple way to produce $BF_3$ from $NaBF_4$ and $KBF_4$. 반도체용 특수가스인 BF3는 반도체 생산공정에서 웨이퍼의 플라즈마 식각 공정과 화학증기증착(CVD : Chemical vapor deposition) chamber 세정공정 등에 사용되며, $BF_3$ 가스는 boron Ion Implant 공정에서 p-type doping을 위한 원료 등으로 사용된다. 본 연구에서는 간단한 공정으로 $NaBF_4$ 와 $KBF_4$의 열분해를 통하여 $BF_3$ 가스의 생산에 대해서 연구 하였다.
이택홍,김명진,박종기 한국수소및신에너지학회 2007 한국수소 및 신에너지학회논문집 Vol.18 No.3
The research on production and application of hydrogen as an alternative energy in the future is being carried out actively. It hydrogen storage is necessary in order that user use hydrogen economically without much difficulty. Among the ways of hydrogen storage the method which is compressed hydrogen gas by high pressure is easier for application than other methods.In this study, we have been calculated gas with changing pressure and temperature variation of container wall through applied to mass and energy balance equation when compressing hydrogen by high pressure, and also to Beattie-Bridgeman equation of state for the kinetic of hydrogen. We will apply above date as a preliminary for design of hydrogen storage tank.
팔라듐 촉매의 메탄 부분산화에 관한 연구 - 반응온도에 따른 효과 -
이택홍,문영환 한국수소및신에너지학회 2004 한국수소 및 신에너지학회논문집 Vol.15 No.3
Pd catalyst have been used in hydrogenation, oxidation, and low temperature combustion reaction. Recently, it has been candidated as a possible reagents in the partial oxidation of methanol reformers of the fuel cell. Pd catalysts, even though it is very precious and expensive, catalytic functioning is good, but it still need to be improved in the matter of durability and low catalytic activity after calcination. In this study, we synthesize the improved Pd catalyst and study their chemical functioning.