基于化学反应动力学的瓦斯爆炸对冲火焰叠加特征的研究

为了研究煤矿瓦斯爆炸过程中火焰相向叠加后，火焰反应区内的化学反应进程，利用化学反应动力学的基本原理和58步甲烷反应机理，分析了火焰区内化学动力学参数的变化规律。认为煤矿瓦斯爆炸对冲火焰两侧反应区内的化学反应进程具有明显的对称特征。汇聚点处的产物浓度最高，H2O的最大摩尔浓度为0.185 382，CO2为0.082 896 4，最高温度为2 246.43 K。爆炸反应区内的CO、H2离子的最大摩尔浓度分别为5.442 28%和2.430 82%，明显高于其他离子浓度，对最终爆炸产物的生成起关键作用。另外，对H2O的生成速率起关键作用的反应步为OH+H2YKNH2O+H，其生成速率为0.010 593 7 mol/(cm3·s)；对CO2起关键作用的反应步为CO+OHFYKNCO2+H，生成速率为0.003 769 56 mol/(cm3·s)。

Superposition characteristics of gas explosion opposed flow flame based on chemical kinetics

In order to investigate the chemical reaction process of explosion superposition flame，the chemical kinetics and 58 step reaction mechanism of CH4 were used to study the variation of parameters in chemical reactions.The obvious characteristic of opposed flow flame is that the reaction process is symmetrical in both sides of reaction zone.The fraction of productions is highest at flame meeting point.The maximum fraction of H2O is 0.185 382，CO2 for 0.082 896 4，the maximum temperature is 2 246.43 K.The maximum fraction of CO，H2 ions in reaction zone is respectively 5.442 28% and 2.430 82%，which is much higher than other ions.This indicate that the two ions play a key role in promoting reactions.In addition，the reaction step of OH+H2YKNH2O+H play a key role in the production of H2O and its rate is 0.010 593 7 mol/(cm3·s)，the reaction step of CO+OHYKNCO2+H for CO2 and with a rate of 0.003 769 56 mol/(cm3·s).