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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。
By using the computational fluid dynamics software FLUENT, the catalytic oxidation process of scarcely concentrated methane gas on the surface of honeycomb ceramic channel coated with Pt catalyst on the wall was studied numerically by introducing CHEMKIN format detailed chemical reaction mechanism. The effects of catalyst-free conditions Under the condition of low concentration of methane, the methane concentration in the channel was also analyzed. The effects of the concentration of scarce air, the inlet air velocity, the channel wall temperature and the channel diameter on the methane oxidation rate were also analyzed. The results show that the Pt metal catalyst supported on the inner wall of honeycomb ceramic channel can not only reduce the temperature required for low concentration methane oxidation but also greatly increase the methane oxidation rate. The methane oxidation rate increases with the concentration of scarce air and the wall temperature Rise and increase, with the entrance of the inlet velocity and channel diameter decreases.