甲烷最大爆炸压力的计算与分析

摘要

In order to solve the problem of gas explosion hazards in the underground mine,the method of filling nitrogen was adopted,two research methods of theoretical calculation and CHEMKIN numerical simulation software were used to study the influence of nitrogen on methane,the explosive mixed gas was selected as the study subject.An unitive performance condition was set up,the relevant mathematical formula and the chemical reaction equation were applied to individually calculate the max explosion pressure value of the methane with different concentrations,to study the data variation features of the max explosion pressure with the two methods and to compare and summarize the max explosion pressure variation law of the gas.The results showed that the nitrogen would have a restrain role to the methane explosion.With the nitrogen increased,the max explosion pressure of the methane would have a relevant attenuation and wholly would be in a unary linear relationship.The max explosion pressure value theoretically calculated would basically be fitted with the numerical simulation and the up and low fluctuation range would be only (0.01～0.30) × 105 Pa.%为了更好地解决井下甲烷燃爆危害的问题,采用了充氮的方法,基于理论计算和CHEMKIN数值模拟软件2种研究方法,研究了氮气对甲烷爆炸的影响,选择爆炸性混合气体作为研究主体,设定统一工况条件,采用相关数学公式和化学反应方程式,分别计算了不同浓度下的甲烷的最大爆炸压力,研究了2种方法下最大爆炸压力数据变化的特点,比较总结甲烷最大爆炸压力的变化规律.结果表明:氮气对甲烷爆炸有抑制作用,随着氮气的增加,甲烷最大爆炸压力会有相应衰减,整体呈一元线性关系;理论计算的最大爆炸压力值基本契合于数值模拟,上下波动范围仅为(0.01～0.30) ×105 Pa.