煤矿乏风瓦斯预热催化氧化装置数学模型

摘要

为了进一步研究低浓度瓦斯预热催化氧化特性，基于自主研发的预热催化氧化装置，建立甲烷预热催化氧化反应一维数学模型。利用一维非均质连续数学模型建立蜂窝陶瓷氧化床模型，该模型包括四个守恒方程：气相质量守恒方程、固相质量守恒方程、气相能量守恒方程、固相能量守恒方程；利用集总参数法建立预热器模型。通过FlexPDE软件数值计算蜂窝陶瓷氧化床温度分布规律，并与实验结果进行对比。计算结果表明：建立的数学模型基本符合甲烷催化氧化的反应特性，所得模拟结果与实验结果较为吻合；蜂窝陶瓷氧化床轴向温度呈先显著升高后缓慢下降的趋势；随着甲烷浓度的增大，氧化床轴向温度升高；随着甲烷风量的增大，氧化床轴向温度升高。%Based on the preheating catalytic oxidation reactor designed by Shandong University of Technology, an one-dimensional mathematical model was set up to further investigate the preheating catalytic oxidation characteristics of ventilation air methane in coal mine. A heterogeneous one dimensional continuum model was chosen for honeycomb ceramic oxidation bed, and it includes four conservation equations as follow, the lfuid concentration conservation equation, solid concentration conservation equation, lfuid temperature conservation equation and solid temperature conservation equation. The model of the preheater was built with lumped parameter method. The temperature distribution of honeycomb ceramic oxidation bed was simulated by FlexPDE, and the results were compared with experimental results. It shows that the mathematical model can roughly describe the preheating catalytic oxidation characteristics of ventilation air methane, and the simulation results show a good agreement with the experimental results. The axial temperature of the preheating catalytic oxidation reactor drops slowly after a signiifcant rise. With the methane concentration increasing, the axial temperature of the oxidation reactor increases. With the methane lfow increasing, the axial temperature of the oxidation reactor increases.