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煤矿通风瓦斯蓄热氧化装置中存在低于爆炸极限下限体积分数25%的甲烷/空气预混气体在高温预热条件下的甲烷氧化放热现象。为了揭示不同体积分数甲烷的氧化放热效应对预混气体预热过程的影响,借助FLUENT软件对预混气体预热过程进行了数值模拟,研究了非稳态流场中化学反应对预热温度的影响。结果表明:甲烷体积分数高于0.2%,预热温度高于900℃时,甲烷的氧化放热效应使预混气体预热温度明显高于空气的预热温度和蓄热材料表面温度,甲烷体积分数提高后预混气体的预热长度减小、蓄热氧化装置中蓄热材料的使用量明显减少,数值模拟结果与实验结果基本吻合。
Methane oxidation of methane / air pre-mixed gas below 25% of the lower limit of explosion limit in the coal mine methane thermal storage and oxidation unit exists at high temperature and preheats. In order to reveal the effect of oxidation and exothermic effect of different volume fraction of methane on the preheating process of premixed gas, the preheating process of the premixed gas was numerically simulated with FLUENT software. The effect of chemical reaction on the preheating temperature in unsteady flow field influences. The results show that when the volume fraction of methane is higher than 0.2% and the preheating temperature is higher than 900 ℃, the preheating temperature of methane is obviously higher than the preheating temperature of air and surface temperature of storage material, and the volume fraction of methane After preheating, the preheating length of the premixed gas decreases, and the amount of heat storage material used in the thermal storage oxidation unit obviously decreases. The numerical simulation results are in good agreement with the experimental results.