煤矿乏风低浓度甲烷催化氧化数值模拟

应用计算流体力学软件FLUENT,通过导入CHEMKIN格式详细化学反应机理对煤矿乏风低浓度甲烷气体在壁面涂有Pt催化剂的蜂窝陶瓷通道表面的催化氧化过程进行数值研究,计算分析了有、无催化剂情况下乏风低浓度甲烷在通道内的反应情况,同时进一步分析了乏风甲烷浓度、入口进气速度、通道壁面温度及通道直径对甲烷氧化率的影响。结果表明:在蜂窝陶瓷通道内壁负载Pt金属催化剂不仅可以降低乏风中低浓度甲烷氧化所需的温度,而且可以大大提高甲烷的氧化率;甲烷氧化率随着乏风甲烷浓度和通道壁面温度的升高而增大,随着入口进气速度和通道直径的增大而下降。

NUMERICAL SIMULATION OF CATALYTIC OXIDATION OF COAL MINE VENTILATION AIR LOW CONCENTRIATION METHANE

With importing the detailed methane/air chemical reaction mechanism,the computational fluid dynamics software FLUENT was applied to numerically simulate the catalytic oxidation of coal mine ventilation air methane in microchannel of honeycomb ceramic which was coated with catalyst Pt.It was analyzed the reaction of vetilation air low concentration methane in microchannel with and without catalyst Pt,and it was further analyzed the effect of methane concentration,gas speed,wall temperature and the diameter of microchannel on the methane oxidation rate.The results show that: 1) with catalyst Pt coated on microchannel,it not only drops the temperature of methane oxidation,and also improves the methane oxidation rate;2) the methane oxidation rate increases with the increase of methane concentration and wall temperature;3) the methane oxidation rate decreases with the increase of gas speed and the diameter of microchannel.