矿井乏风逆流氧化床温度分布和工作特性研究

为了给矿井乏风逆流氧化装置设计提供理论依据,数值模拟研究了逆流氧化床温度分布和工作特性.结果显示：逆流氧化床内固体蜂窝陶瓷的蓄热和释热效应,使得含甲烷气体成分极低的模拟矿井乏风在其内能够自维持逆流高温氧化.数值模拟中逆流氧化床轴向中心线上M形温度分布特点与实验结果一致.逆流氧化床轴向中心线上温度分布、出口温度值、化学反应速率分布、气固两相间单位容积换热量分布主要受往复半周期、混合气体中甲烷气体质量分数和混合气体质量流量等参数影响.

Investigation of temperature distribution and work characteristics for flow-reversal thermal oxidation bed of coal mine ventilation air methane

To provide a theoretical basis for the design of the flow-reversal thermal oxidation equipment,the temperature distribution and work characteristics for a flow-reversal thermal oxidation bed are numerically studied. The experimental results show that the most heat of the methane thermal oxidation can be stored by the honeycomb ceramic filled in the oxidation bed of the thermal flow-reversal oxidation equipment, and then used to preheat the fresh mixture gas. The dilute methane in mixture gas can keep an independent self-sustain thermal oxidation course in the flow-reversal thermal oxidation bed. The M-shaped configuration of the temperature profile along the axial direction in the numerical simulation is in good agreement with the experiment. Meanwhile, profiles of the temperature distribution, exhaust temperature, oxidation reaction rate distribution, heat transfer from gas to solid medium along the axial direction in the oxidation bed are mainly subjected to effects of the half cycle, mass fraction of methane in mixture gas, mass flow rate.