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황상연(Sang Yeon Hwang),정기진(Ki Jin Jeong),윤성필(Sung Pill Yoon),정석우(Seok Woo Chung),이진욱(Jin Wook Lee),김용전(Yong Jeon Kim),임성광(Sung Kwang Lim),김형택(Hyung Taek Kim) 한국에너지기후변화학회 2014 에너지기후변화학회지 Vol.9 No.1
Alternative energy resources have been sought worldwide and the related research activities are underway to reduce the evolution of the green-house gases and to counteract the energy consumption of fossil fuel and high crude oil price. In this regard, coal gasification technology is one of the fastest growing technologies in the alternative energy industry for its capability to produce clean fuel from the low rank coal. Although low rank coal is more attractive than expensive bituminous coal, challenging technical barriers must be overcome before large scale utilization of low rank coal: most notably of all, high moisture content and spontaneous ignition during storage. Therefore, it is necessary to improve the quality of the low rank coal by drying process for efficient and environment-friendly use of low rank coal. In the present research, lab-scale study was carried out to investigate the drying characteristics of pulverized low rank coal. More specifically, a series of experiments was designed and conducted to see the effects of hot carrier gas temperature and its flow rate during the pneumatic transport of the pulverized coal.
유상오(Sang Oh Yoo),이진욱(Jin Wook Lee),정석우(Seok Woo Chung),윤성필(Sung Pill Yoon),이재만(Jae Man Lee),이민회(Min Hoe Yi),임성광(Sung Kwang Lee) 한국에너지기후변화학회 2013 에너지기후변화학회지 Vol.8 No.1
Pulverized low rank coal for the utilization of fast fluidized bed gasification is larger in size and higher in moisture content compared to those of entrained bed gasification. So, coal transport might not be stable because of strong possibility of bridging in the injection vessel and plugging in the transport line. In this study we have been trying to develop the new technology to overcome such operational problems. As first step to develop such technology, series of pneumatic transport experiment have been performed using simple transport system which is consist of injection vessel and receiver tank. Characteristics of pneumatic transport of pulverized low rank coal have been studied under various operating conditions such as operating pressure, pressure difference between injection vessel and receive tank and so on.
수증기 개질 반응기 내의 열 및 물질전달 특성에 관한 연구
이신구(Lee, Shin-Ku),임성광(Lim, Sung-Kwang),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
In this paper, heat and mass transfer characteristics through experimental and numerical study are extensively investigated in steam reform ins reactor under given operating conditions. In order to get simulated data at outlet of the reformer, heterogeneous reactor model is incorporated. As the reaction also takes place in porous media, two medium approach is used to take into account thermally non-equilibrium phenomena between catalyst and bulk gas. In steam reforming reaction, heat transfer issue is so significant that geometrical configuration study is also conducted.
효율적 수소 생산을 위한 메탄 수증기 개질 반응기에서의 불연속적 가스 유입의 영향
이신구(Lee, Shin-Ku),박준근(Park, Joon-Guen),임성광(Lim, Sung-Kwang),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
Steam reforming reaction is a matured technology to get hydrogen from hydrocarbon fuels compared with other reforming reactions such as partial oxidation(POX), autothermal reforming(ATR). It is so endothermic that it needs heat source to activate the reaction. Due to the reaction characteristics, heat transfer limitation phenomena generally occur in the steam reformer. As one of new ideas, the effect of discontinuous gas feeding is investigated based on heat transfer characteristics. The new operating method is usually favorable at high GHSV region(i.e. over 10,000h^{-1}). In order to numerically simulate the physical issues, numerical approach is adopted based on heterogeneous reaction model, two-equation model in energy equation, and other constitutive models in porous media.
수증기 개질 반응기 내의 열 및 물질전달 특성에 관한 연구
이신구(Lee, Shin-Ku),임성광(Lim, Sung-Kwang),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2006 신재생에너지 Vol.2 No.4
In this paper, heat and mass transfer characteristics through experimental and numerical study are extensively investigated in steam reforming reactor under given operating conditions. In order to get simulated data at outlet of the reformer, heterogeneous reactor model is incorporated. As the reaction also takes place in porous media, two medium approach is used to take into account thermally non-equilibrium phenomena between catalyst and bulk gas. From various parametric studies, significance of heat transfer is emphasized in steam reforming reaction.
박준근(Park, Joon-Guen),이신구(Lee, Shin-Ku),임성광(Lim, Sung-Kwang),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Characteristics of an autothermal reformer at various operating parameters have been studied in this paper. Numerical method has been used, and simulation model has been developed for the analysis. Full Combustion reaction, Steam Reforming(SR) reaction, Water-Gas Shift(WGS) reaction, and Direct Steam Reforming(DSR) reaction are assumed as dominant chemical reactions in the autothermal reformer. Simulation results are compared with experimental results for code validation. Operating parameters of the autothermal reformer are inlet temperature, Oxygen to Carbon Ratio(OCR), Steam to Carbon Ratio(SCR), and Gas Hourly Space Veolcity(GHSV). SR reaction rate decreases with low inlet temperature. If OCR is increased, H₂ yield is increased but optimal point is suggested. WGS reaction is activated with high SCR. When GHSV is increased, reforming efficiency is increased but pressure drop may decrease the system efficiency.
수치해석을 이용한 수증기 개질 반응기의 다양한 경계조건 및 형상의 영향
박준근(Park, Joon-Guen),이신구(Lee, Shin-Ku),임성광(Lim, Sung-Kwang),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
Steam reforming reaction of natural gas is an important process for fuelcell commercialization. In this paper, steam reforming reaction is studied by numerical method. Pseudo-homogeneous model is incorporated for chemical reactions and one medium approach is used to take into account thermally equilibrium phenomena between catalyst and bulk gas. The model is validated with our experimental results under the same operating conditions. Because performance of reformer has relation to heat flux from wall, heat flux profiles was investigated by using Nusselt number. Value of Nusselt number in steam reformer is larger than one in channel, which does not have chemical reaction because steam reforming reaction is an endothermic reaction. When the difference of Nusselt number at the front and the rear is larger, performance is improved.