煤矿巷道内N_2及CO_2抑制瓦斯爆炸的机理特性

Mechanism characteristics of CO_2 and N_2 inhibiting methane explosions in coal mine roadways

为探求煤矿巷道内惰性气体(氮气及二氧化碳)对瓦斯预混合爆炸的影响,采用详细反应机理(包括53种组分、325个反应),运用化学动力学计算软件CHEMKIN 3.7中PREMIX程序包,建立巷道内瓦斯爆炸过程的数学模型。通过数值计算,对比了N_2及CO_2对瓦斯爆炸过程中反应物、自由基、爆炸后产生的主要致灾性气体的浓度以及甲烷总消耗速率等变化的影响,分析N_2及CO_2对瓦斯爆炸反应过程影响的异同。计算结果表明,在相同体积分数下,CO_2比N_2更能有效地降低体系中的活化中心浓度和爆炸中所生成致灾性气体CO,NO的浓度,因此CO_2在抑制瓦斯爆炸作用方面比N_2的效果更为明显。

In order to determine the effect of inert gas(N_2 and CO_2) on the process of methane premixed explosion in coal mine roadways,the detailed reaction mechanisms(include 53 mixtures,and 325 reactions) were investigated in this study.The mathematical model of methane explosion in the coal mine roadway was developed using the PREMIX code of CHEMKIN 3.7 chemical kinetics packages.Through numerical computation,the change currents of reactant and free radical concentration,catastrophic gases generated from methane explosion and total consumption rate of methane were compared,due to the effect of N_2 and CO_2 on methane explosions,and the similarities and differences were also analyzed.The results show that CO_2 is more effective than N_2 in lowering the concentration of activation center during the reaction system and main catastrophic gases of CO and NO resulting from methane explosion.Therefore, it concludes that:CO_2 is more effective than N_2 in inhibiting methane explosion.