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Recent developmental status and prospects of hydrogen refueling stations
( Wang Lai Yoon ),( Dong Joo Seo ) 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
Hydrogen refueling infrastructure to support the introduction of fuel cell and other hydrogen(and hydrogen mixture)-fueled vehicles is seen as one of the key factors for the transition to the hydrogen economy. Basically, hydrogen station can be configured by any combination of six modules : hydrogen generator, purifier, compression, storage, dispenser and power generator. And there can be several ways in hydrogen delivery for use at refueling stations. In the early demonstration phase, the use of distributed hydrogen refueling system(cryogenic liquid hydrogen, compressed hydrogen, reforming of hydrocarbonfeedstocks such as natural, gas, LPG and naphtha, electrolysis of water) may be a intermediate pathways to infrastructure development with future development of hydrogen pipeline delivery. The understanding of the implications of each system as well as comparisons between the choices of generation methods for use is essential in developing the refueling infrastructure. In this session, we present the recent developmental status and prospects of hydrogen refueling stations in advanced countries such as America, Japan, and Europe. Especially, national demonstration programs to promote early introduction of hydrogen fueled vehicles are reviewed.
에너지/환경 : 5㎾급 고분자연료전지용 천연가스 개질기 시스템 운전 특성 연구
윤왕래 ( Wang Lai Yoon ),박종원 ( Jong Won Park ),이영우 ( Young Woo Rhee ),한명완 ( Myung Wan Han ),정진혁 ( Jin Hyeok Jeong ),박종수 ( Jong Soo Park ),정헌 ( Heon Jung ),이호태 ( Ho Tae Lee ),김창수 ( Chang Soo Kim ) 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.3
Prototype 5 kW-class fuel processor based on steam reforming of natural gas with heat and system integration has been designed and fabricated for use in proton exchange membrane(PEM) fuel cell with residential applications. Endothermic heat for steam reforming has been supplied by radiation type metal fiber burner. The performance of the integrated system has been experimentally evaluated for the reformer temperature of 600-800℃ at constant GHSV of each reactor and atmospheric system pressure. The final product(β^= type) can produce the total gas flow of 6.5 6.5N㎥/h(H_2 conc.: 74%, dry basis) under reformer temperature and space velocities of 800℃, 1,950 h^-1, respectively and also remove CO concentration under 10 ppm by two series fin type packed beds employing Pt[λ2O_2/CO)=2.1] and Ru[λ(2O_2/CO)=3.5] catalysts with interstage cooling. The overall fuel processing efficiency of about 52% calculated by the total H_2 output after PrOx to total methane flow into the reformer and the burner based upon higher heating values is somewhat lower. This was mainly attributed from the fact that heat loss from the exhaust gas after supplying heat necessary for raising the reformer temperature by combustion of natural gas was excessively high.
Jung, You-Shick,Yoon, Wang-Lai,Seo, Yong-Seog,Rhee, Young-Woo Elsevier 2012 CATALYSIS COMMUNICATIONS - Vol.26 No.-
<P>Ni-Al<SUB>2</SUB>O<SUB>3</SUB> catalysts are prepared via the co-precipitation method using various precipitants: urea, Na<SUB>2</SUB>CO<SUB>3</SUB>, NaOH, K<SUB>2</SUB>CO<SUB>3</SUB>, KOH and NH<SUB>4</SUB>OH. The effects of the precipitants on the physicochemical properties and catalytic activities of the Ni-Al<SUB>2</SUB>O<SUB>3</SUB> catalysts are investigated. The Ni50-urea catalyst displays the largest specific surface area and the highest pore volume. This catalyst also exhibits the highest Ni dispersion and the largest Ni surface area. Ni50-urea catalyst prepared with urea as precipitant and Ni50-K<SUB>2</SUB>CO<SUB>3</SUB> catalyst prepared with K<SUB>2</SUB>CO<SUB>3</SUB> as precipitant exhibit high pore volumes and good catalytic activities for methane steam reforming. The Ni50-urea catalyst exhibits the best physicochemical properties and shows good catalytic activity and a strong resistance to electrolyte contamination.</P>
Lee, Deuk Ki,Hyun Baek, II,Lai Yoon, Wang Elsevier 2006 International journal of hydrogen energy Vol.31 No.5
<P><B>Abstract</B></P><P>A hybrid reaction system of catalytic methane steam reforming (MSR) and in situ non-catalytic removal of <SUB>CO2</SUB> by the carbonation of CaO to <SUB>CaCO3</SUB> in a moving bed reactor where reforming catalyst and CaO-based <SUB>CO2</SUB> acceptor in pellets move co-currently with gaseous reactants has been simulated through a mathematical model. The model has been developed at non-isothermal, non-adiabatic, and non-isobaric operating conditions assuming that the rate of the CaO carbonation in a local zone of the reactor bed is governed by kinetic limitation or by the <SUB>CO2</SUB> limitation in bulk gas phase. The effects of major operating parameters such as the feed rates of CaO and <SUB>CH4</SUB>, and the reactor bed temperature on steady-state behavior of the hybrid reaction in a moving bed reactor have been determined. It was revealed that the feed rate of CaO for a given feed rate of <SUB>CH4</SUB> should be optimized in order to maximize the utilization degree of CaO carbonated through the reactor while producing the reformed gas in the possible lowest concentration of <SUB>CO2</SUB> at a given temperature of reaction.</P>
통계적 실험계획에 의한 폐플라스틱/폐유의 최적 열분해 반응조건 결정
윤왕래,박종수,정헌,이호태,고성혁,김성현,Yoon, Wang-Lai,Park, Jong-Soo,Jung, Heon,Lee, Ho-Tae,Ko, Sung-Hyuk,Kim, Sung-Hyun 한국에너지학회 1999 에너지공학 Vol.8 No.1
범용 열가소성 플라스틱(polyethylene(PE), polypropylene(PP), polystyrene(PS), polyethylene-terephthalate(PET), acrylonitrile-butandiene-styrene(ABS))과 폐윤활유의 동시처리 열분해반응 실험을 수행하였다. 반응실험은 40$m\ell$ 용량의 회분식 미분반응기(microreactor)를 이용한 실험과 1리터 용량의 autoclave를 이용한 실험의 두 가지로 구분하여 행하였다. 전자의 경우는 통계적 실험적계획법(statistical experimental design)의 하나인 회전계획실험(rotatable design experiments)으로서 오각형 실험계획(pentagonal experimental design)에 의거한 반응변수 실험을 수행한 후 반응표면(response surface)을 회기분석법에 의하여 분석함으로써 최대의 오일 수율을 얻을 수 있는 최적 반응조건을 추적, 결정하였다. Autoclave 반응실험의 기본적인 목적은 실제 연속공정에 있어서 열분해 반응기 거동을 모사하기 위한 전초단계로서 충분한 시료의 확보를 통하여 이 때 생성된 연로유의 체계적인 분석(비등점분포특성, 진공증류, 기체분석, 원소분석, 발열량, 비중 등)을 행함으로써 연료유 수율 및 품질을 모사하고자 하였다. 미분반응기 실험에 있어서 주 범용열가소성수지인 PE, PP 그리고 PS는 각각의 최적반응조건하에서 거의 100%에 가깝게 오일로 전환되었지만 응축수지인 PET와 그래프트공중합수지인 ABS의 오일수율은 각기 78% 및 90%로서 상대적으로 낮게 나타났다. Autoclave를 이용한 실험의 경우 혼합플라스틱을 폐유에 대하여 40wt% 혼합하여 열분해하였을 때, 80wt% 오일, 15wt% 코우크, 그리고 나머지 5wt%는 탄화수소기체(C1-C6)로 전환되었다. 진공증류(252$^{\circ}C$,2 torr) 결과, 기/액-분리도는 3으로서 이는 생성오일의 75wt%가 경질연료유(가솔린, 등유, 경유)로 회수 가능하였다.