变温下多元可燃气体对甲烷爆炸特性的影响数值模拟

Numerical Simulation of Effect of Multi-component Combustible Gases on Methane Explosion at Variable Temperature

摘要: 为有效地预防及控制矿井下煤自燃过程中产生的常见可燃气体对甲烷爆炸所造成的后果,利用FLACS软件模拟研究了5种初始温度(25、60、100、140、180 ℃)下C₂H₄、C₂H₆、H₂和CO这4种气体按不同比例混合后对甲烷最大爆炸压力和最大爆炸温度的影响。研究表明:在定容常压下,随初始温度的增加,与任意多元气体混合后的甲烷,其最大爆炸温度呈上升趋势,最大爆炸压力则呈下降的趋势。随4种可燃气体的混合体积分数从0.4%增加到2.0%,甲烷最大爆炸温度和最大爆炸压力上升且初始温度较低时升幅更大。

Abstract: To study the influence of common combustible gas produced in spontaneous combustion of underground coal on methane explosion, the effects of the mixture of C₂H₄, C₂H₆, H₂ and CO on the maximum explosion pressure and temperature of methane were simulated by FLACS software at 5 initial temperatures (25, 60, 100, 140 and 180 ℃). The results show that, with the increase of initial temperature, the maximum explosion temperature of methane and the maximum explosion pressure show an upward trend, while the maximum explosion pressure shows a downward trend. With the increase of the volume fraction of the four combustible gases from 0.4% to 2.0%, the maximum explosion temperature and the maximum explosion pressure of methane increased even more when the initial temperature was lower.