封闭空间瓦斯爆炸过程的反应动力学分析  

Analysis of Reaction Kinetic for Gas Explosion in Enclosed Space

作　　者：梁运涛[1] 

机构地区：[1]煤炭科学研究总院沈阳研究院煤矿安全技术国家重点实验室,辽宁沈阳110016

出　　处：《中国矿业大学学报》2010年第2期196-200,共5页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2005CB221506);国家自然科学基金项目(50674055)

摘　　要：为了获取瓦斯爆炸过程中反应动力学参数,通过修改化学动力学计算软件CHEMKINIII中的SENKIN程序包,采用甲烷燃烧的化学动力学详细反应机理(包括16种组分、41个反应),建立了定容弹中瓦斯爆炸过程的计算模型.利用该模型对瓦斯爆炸过程中温度、压力及反应物浓度的变化趋势进行了模拟分析,同时通过对瓦斯爆炸详细反应机理的敏感性分析,找出了影响瓦斯爆炸以及爆炸后部分致灾性气体生成的关键反应步.结果表明:瓦斯爆炸后温度、压力将分别达到2800K,0.24MPa左右;促进瓦斯爆炸的关键反应步为CH3+O2=CH3O+O,CH4+HO2=CH3+H2O2;促进CO与CO2生成的关键反应步为CH3+O2=CH3O+O,CH4+O2=CH3+HO2,CH4+HO2=CH3+H2O2,CH3+HO2=CH3O+OH,H+O2=OH+O.The SENKIN code of the CHEMKIN Ⅲ chemical kinetics package was modified to include a computational gas-explosion model within a constant volume. The code was used to analyze reaction kinetics during a gas explosion. The detailed reaction mechanism included 16 reactive species and 41 reaction steps. The effect of temperature, pressure and mole-fraction was examined. Sensitivity analysis indicated the key steps that affect gas explosions and which gas mixtures were most prone to explosion. After explosion the predicted temperature and pressure were about 2 800 K and 0.24 MPa. The key steps at the beginning of the explosion are CH3 ＋O2 = CH3O＋O and CH4＋HO2 = CH3 ＋ H2O2. The key steps that are involved in the formation CO and CO2 are CH3 ＋O2 =CH3O＋O, CH4＋O2=CH3 ＋HO2, CH4＋HO2 = CH3＋H2O2, CH3＋HO2=CH3O＋OH, and H＋O2 =OH＋O.

关 键 词：瓦斯爆炸 化学动力学模型 数值模拟 敏感性分析 致灾性气体 

分 类 号：TD712[矿业工程—矿井通风与安全]