工况参数对乏风瓦斯热氧化阻力特性的影响

The effects of operating parameters on resistance characteristics of the thermal oxidation process for ventilation air methane

为了揭示氧化装置每个工作循环内的阻力变化机理,基于60 000m3/h煤矿乏风热逆流氧化试验装置建立热氧化的控制方程,并采用多孔介质模型对氧化过程的阻力非定常变化特性进行研究.结果表明:进气速度和散热功率增大后燃烧波的移动加快;阻力损失的大小与高温区面积有关,进气速度、甲烷体积分数和初始温度增大阻力损失升高,而散热功率增大阻力损失降低;阻力损失的非定常变化规律与氧化反应放热量和系统散热量的相对大小有关,进气速度、甲烷体积分数和初始温度增大后阻力损失随时间增大,而散热功率增大后阻力损失随时间减小.

To reveal the resistance change mechanism of the thermal flow-reversal reactor within each operating cycle,the thermal oxidation control equations were built based on the thermal flow-reversal reactor with processing capacity of 60 000m3/h.A heterogeneous porous media model was chosen and the effects of operating parameters on the unsteady resistance were investigated.The results show that the velocity of combustion wave speeds up after inlet velocity and heat dissipation power increase.The size of the resistance loss is related to the area of the high temperature zone.The resistance loss grows with the increase of inlet velocity,methane volume fraction and initial temperature,while drops with the increase of heat dissipation power.The unsteady variation law of the resistance loss is associated with the relative size of oxidation heat and dissipation heat.The resistance loss rises over time under higher inlet velocity,methane volume fraction and initial temperature and yet reduces over time under higher heat dissipation.