乏风瓦斯蓄热氧化床阻力特性的数值模拟

基于自行开发的煤矿乏风热逆流氧化试验装置，采用多孔介质均质模型，建立了煤矿乏风蓄热逆流氧化的控制方程组和化学反应方程，模拟研究了氧化床运行参数、蜂窝陶瓷的结构参数和物性参数对氧化床的流动阻力和出口温度的影响规律。计算结果表明：在气流方向切换瞬间，氧化床的压强损失瞬时增大，经过1~2 s后趋于稳定；随着进入氧化床的乏风气体表观速度的增加，压强损失和出口温度都增加；乏风甲烷浓度对压强损失影响较小；提高蜂窝陶瓷的孔隙率，可以有效降低阻力损失，但是蓄热能力明显下降；提高比热容，有利于氧化装置稳定运行；随着当量直径的增加，压强损失显著降低。

Numerical simulation on resistance of the regenerative oxidation bed

The control equations and chemical reaction equation about coal mine methane thermal oxidation were proposed for a self-developed thermal reverse-flow reactor. The effects of flow resistance and outlet temperature were studied under operating parameters of the oxidation bed, structural parameters and physical parameters of honeycomb ceramic by using homogeneous porous media model. The results show that the oxidation bed resistance instantaneously increases while switching the direction of airflow, gradually stabilized after 1~2s. With the increase of coal mine methane superficie velocity, pressure loss and outlet temperature of the oxidation bed increase. The methane concentration has less effect on pressure loss. With the increase of porosity of ceramic honeycomb, pressure loss decrease obviously, but regenerative capacity decreased obviously. With the increase of specific heat, operation stability of thermal reverse-flow reactor increase. With the increase of equivalent diameter, pressure loss decrease significantly.