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Parametric Study of an Integrated Steam Methane Reformer with Top-Fired Combustor
노정훈(Noh, Jung-Hun),정혜미(Jung, Hye-Mi),김동희(Kim, Donghee),엄석기(Um, Sukkee) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
It is of great importance to predict operating parameter characteristics of an integrated fuel processor by the increased life-time and system performance. In this study, computational analysis is performed to gain fundamental insights on transport phenomena and chemical reactions in reformer which consists of preheating, steam reforming, and water gas shift reaction beds. Also, a top-fired burner locates inside of the reforming system. The combustor is providing thermal energy necessary for the steam reforming bed which is a endothermic catalytic reactor. Two-dimensional numerical model of the integrated fuel processing system is introduced for the analysis of heat and mass transport phenomena as well as surface kinetics and catalytic process. A kinetic model was developed and then computational results were compared with the experimental data available in the literature. Subsequently, parameter study using the validated steam methane reforming model was conducted by considering operating parameters, i.e. steam to carbon ratio and temperature.
개선된 역열전달 해석모델을 이용한 포열 내부의 열유속 특성 분석
노정훈(Jung-Hun Noh),이예승(Yeseung Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this study, we developed the improved inverse heat conduction model that can predict the heat flux applied to the inside of the gun barrel by using the measured outside temperature. The improved reverse heat conduction model is not affected by changes in material properties (conduction coefficient) and geometric parameters (thickness), minimizing the time delay and waveform distortion shown in the previous model. The inverse heat conduction problem of the gun barrel was solved using a multi-point measurement and thermal resistance network method that considers the material properties with temperature. The unknown heat flux of the inner tube wall was estimated from the measured temperature of the outer tube wall by a recursive input estimation algorithm consisting of a Kalman filter, real-time least squares, and a measured temperature gradient. Using the developed inverse heat conduction analysis model, the effects of heat flux characteristics and performance according to the number of shots changes and initial conditions were analyzed.