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为探索甲烷浓度、乏风流量、换向半周期及壁面热损失等工况参数对煤矿乏风低浓度瓦斯热逆流氧化过程的影响,采用自行设计的低浓度瓦斯热逆流氧化装置,对不同工况下的低浓度瓦斯热逆流氧化开展了系统的试验研究。结果表明:随着甲烷浓度的提高和壁面热损失的降低,氧化床高温区域拓宽,最高温度、出口温度及甲烷转化率均升高;当乏风量较低时,乏风甲烷保持较高的转化率,氧化床内整体温度随着乏风量的增加而提升;当乏风量达到一定值后,继续增加流量,氧化床温度场不但不上升反而下降;随着换向半周期的延长,氧化床高温区向氧化床出口端移动,高温区域变窄,出口温度升高,甲烷转化率略有下降。
In order to explore the influence of operating parameters such as methane concentration, lack of air flow, half cycle of commutation and heat loss of wall on the thermal countercurrent oxidation of mine gas under low concentration of gas, a low concentration gas countercurrent oxidation device Under the condition of low concentration gas countercurrent oxidation carried out a systematic experimental study. The results show that with the increase of methane concentration and the decrease of heat loss on the wall, the maximum temperature, outlet temperature and methane conversion rate are broadened in the high temperature region of the oxidation bed. When the amount of the scarce air is low, the scarce wind methane maintains high conversion The overall temperature in the oxidation bed increases with the increase of the amount of exhausted air. When the amount of the exhausted air reaches a certain value, the flow rate continues to increase. The temperature field of the oxidation bed not only does not rise but decreases. With the extension of the half cycle of reversal, The zone moves towards the exit end of the oxidation bed, narrowing the high temperature zone, raising the outlet temperature and slightly decreasing the methane conversion rate.