乙炔对瓦斯爆炸的化学动力学影响模拟研究

Simulation study on influence of C2H2 on chemical kinetics of gas explosion

为预防煤矿井下瓦斯与乙炔(C2H2)混合气体爆炸的发生,通过在CHEMKIN-Pro软件中使用化学反应模型GRI-Mech3.0,研究不同体积分数C2H2对瓦斯爆炸的爆炸极限的影响,并详细分析爆炸过程中压力、温度、自由基及其敏感性变化和爆炸结束后主要生成物含量。研究结果表明:随着C2H2体积分数的增大,混合气体爆炸下限降低,爆炸上限上升,最大爆炸压力和最高爆炸温度变大,O2的消耗量变大,生成物中的CO体积分数上升,其他生成物如CO2、H2O、NOx体积分数下降;而且C2H2加速消耗自由基中的O、OH,导致O、OH自由基含量显著下降;敏感性分析显示,随着C2H2的加入,促进主要自由基消耗的反应从R158变为R53,促进主要自由基形成的反应由R155变为R38。

In order to prevent explosion of mixed gas and C2H2 in coal mines,influence of C2H2 concentration on explosion limit of gas explosion were studied by using chemical reaction model GRIMech3.0 in CHEMKIN-Pro software.Then,changes of pressure,temperature,free radicals and their susceptibility during explosion process of mixed gas and main products content after explosion were analyzed in detail.The results show that as C2H2 concentration increases,lower limit of explosion decreases,upper explosion limit rises and maximum pressure as well as maximum temperature increase.Meanwhile,consumption of O2 and CO concentration in products increases while that of other products such as CO2,H2 O,and NOxdecreases.Moreover,C2H2 accelerates consumption of O and OH in free radicals,resulting in a significant decrease in content of O and OH free radicals.And sensitivity analysis indicates that addition of C2H2 causes reaction to promote consumption of major free radicals to change from R158 to R53,and that to promote their formation to change from R155 to R38.