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변도현(Do-Hyun Byun),손창현(Chang-Hyun Sohn) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
In this paper, various operating parameters of stream reforming process from methane in preconverter for MCFC is studied by numerical method. Commercial code is used to simulated the porous catalyst with user subroutine to model three dominant chemical reactions which are Stream Reforming(SR), Water-Gas Shift(WGS), and Direct Stram Reforming(DSR). The hydrogen production is tested with different wall temperature, Gas Hourly Space Velocity(GHSV), and different reactor shapes.
변도현(Byun Do-Hyun),손창현(Sohn Chang-Hyun) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
In this paper, 2D and 3D preconverter for MCFC is simulated and compared for various operating parameters of stream reforming process from methane. Commerical code is used to analysis the porous catalyst with user subroutine to model three dominant chemical reactions which are Stream Reforming(SR), Water-Gas Shift(WGS), and Direct Stram Reforming(DSR). The hydrogen production is tested with different wall temperature, Gas Hourly Space Velocity(GHSV), and different reactor ahapes. Calculated results show that the axisymmetrick results and 3 dimensional results are so similar and the 3 dimensional effect can be negligible.
변도현(Do-Hyun Byun),손창현(Chang-Hyun Sohn) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.1
In this paper, various operating parameters of stream reforming process from methane in stream reformer and preconverter for MCFC is studied by numerical method. Commercial code is used to simulated the porous catalyst with user subroutine to model three dominant chemical reactions which are Stream Reforming(SR), Water-Gas Shift(WGS), and Direct Stram Reforming(DSR). The hydrogen production is tested with different wall temperature and different reactor shapes. The calculated results of the concentration of hydrogen in stream reformer are very well consistent with experimental results. This numerical study gives the design reactor wall temperature condition and size of reactor to satisfy the required fuel conversion.
MCFC 프리컨버터 촉매의 열전도특성과 연료전환율 해석
변도현(D.H. Byun),손창현(C.H. Sohn) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
In this paper, a preconverter of MCFC for an emergence electric power supplier is numerically simulated to increase the hydrogen production from natural gas (methane). Commercial code is used to simulated the porous catalyst with user subroutine to model three dominant chemical reactions which are Stream Reforming(SR), Water-Gas Shift(WGS), and Direct Stram Reforming(DSR). To get 10% fuel conversion rate in preconverter, the required external heat flux is supplied from outer wall of preconverter. The calculated results show that very nonuniform temperature distribution and chemical reaction happen near the wall of preconverter. These phenomena can be explained by the low heat conductivity of porous catalyst and the endothermic reforming reaction.
MCFC 프리컨버터 촉매의 열전도특성과 연료전환율 해석
변도현(Do Hyun Byun),손창현(Chang Hyun Sohn) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.4
본 연구에서는 비상시 전기 공급용 MCFC 프리커버터의 천연가스(메탄)로부터 수소의 생산량을 증가시키는 경우를 수치적으로 해석하였다. 상용 코드를 사용하였으며 촉매는 다공성 매질로 시뮬레이션 하였다. 3가지 주요 화학반응인 수증기 개질반응(SR), 수성 가스 전환(WGS) 및 직접 수증기 개질 반응(DSR)은 사용자 부프로그램을 사용하여 해석하였다. 프리컨버터에서 10%의 연료전환율을 얻기 위해 요구되는 추가 열량을 벽면을 통해 공급하게 되면 프리컨버터의 벽면 부근에서만 매우 불균일한 온도분포와 화학반응이 일어나는 것으로 분석되었다. 이와 같은 현상은 매우 작은 열전도율을 갖는 다공성 매질의 촉매와 흡열반응으로 설명되어질 수 있다. 해석결과 프리컨버터의 길이가 짧은 경우가 보다 균일한 연료전환율을 보여 주며, 촉매의 유지 보수 면에도 길이가 짧은 경우가 유리함을 보여 주었다. In this study, a preconverter of an MCFC for an emergency electric power supplier is numerically simulated to increase the hydrogen production from natural gas (methane). A commercial code is used to simulate a porous catalyst with a user subroutine to model three dominant chemical reactions-steam reforming, water-gas shift, and direct steam reforming. To achieve a fuel conversion rate of 10% in the preconverter, the required external heat flux is supplied from the outer wall of the preconverter. The calculated results show that the temperature distribution and chemical reaction are extremely nonuniform near the wall of the preconverter. These phenomena can be explained by the low heat conductivity of the porous catalyst and the endothermic reforming reaction. The calculated results indicate that the use of a compact-size preconverter makes the chemical reaction more uniform and provides many advantages for catalyst maintenance.
Sensitivity limitation of the sensor fabricated with polydiacetylene
신민재,변도현,김종득 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
In order to estimate the sensitivity limitation of the polydiacetylene (PDA) sensor system, the response of the PDA system to several sulfonate salts and amines were examined. The PDA systems were fabricated with N-(2-aminoethyl)pentacosa-10,12-diynamide (AEPCDA) and 10,12-pentacosadiynoic acid (PCDA). The functional group at the end of the PDA system is crucial to sensing the substrate because this functional group interacts with the substrate. The sensitivity limitation toward the molecular weight and the concentration of the substrate is also revealed. The pKa of the amines is less crucial to the sensing than the molecular weight of the substrate.