瓦斯爆燃防爆安全距离及传播特征的数值模拟  

Numerical simulation of explosion-proof safety distance and propagation characteristics of gas deflagration

作　　者：江丙友[1,2] 林柏泉[1,2] 陈健[1] 郭畅[1,2] 张鹏[1] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《采矿与安全工程学报》2014年第1期139-145,共7页Journal of Mining & Safety Engineering

基　　金：国家重大科学仪器设备开发专项资金项目(2013YQ17046309);国家自然科学基金项目(51204174;51274195;51004048;51374003;U1361106);江苏省普通高校研究生科研创新计划项目(CXZZ12_0960);中央高校基本科研业务费专项资金项目(2012DXS02);江苏省自然科学基金项目(BK2012571);教育部新世纪优秀人才支持计划项目(NCET-12-0959)

摘　　要：运用AutoReaGas软件建立了长为100 m,截面为0.08 m×0.08 m的爆炸巷道,其中前10 m巷道均匀充满体积分数9.5%的甲烷与空气预混气体。结果表明:在瓦斯爆炸传播过程中,最大超压呈现先减小、后增大、再减小的变化过程,它在火焰熄灭的位置附近达到最大。最大燃烧速率和火焰传播速度均随着传播距离的增加而增大,取得最大值后又开始减小。最大超压和最大气流速度在距离点火源35 m时均已减小为零,最大密度在此点也减小为原始密度,此条件下的防爆安全距离为35 m。最大燃烧速率和火焰传播速度在距离点火源17 m时均已减小为零,火焰锋面传播的最大距离为17 m。气体发生逆流与火焰的存在有关。研究成果可为煤矿瓦斯爆炸最佳避灾路线的确定、爆炸发生后的抢险救灾、事故的调查等提供参考。In this paper, an explosion roadway with the length of 100 m and cross-sectional area of 0.08 m＆#215;0.08 m was established by using AutoReaGas Software, where the methane/air mixture gas with 9.5%fuel concentration is distributed uniformly within the first 10 m of the roadway. The results show that the maximum explosion overpressure presents a changing trend of decreasing, increasing, and de-creasing again in the process of gas explosion propagation, and reaches its maximum value near the lo-cation where the flame is extinguished. Both the maximum combustion rate and flame propagation speed increase firstly with the increase of propagation distance, and then begin to decrease after obtain-ing their corresponding maximum values. The maximum overpressure and gas velocity have reduced to zero at the distance of 35 m from the ignition source, and the maximum density also has decreased to its initial value at this distance. These trends indicate that the explosion-proof safety distance is 35 m under this condition. The maximum combustion rate and flame propagation speed have reduced to zero at the＆amp;nbsp;distance of 17 m, which indicates that the maximum distance of flame propagation is 17 m. The occur-rence of gas backflow is related to flame propagation. The research results can provide references to op-timal route determination for avoiding gas explosion disasters in underground coal mines, the emergen-cy rescue and disaster relief after gas explosion, the explosion accident investigation, and so on.

关 键 词：瓦斯爆炸 爆炸波 火焰 防爆安全距离 数值模拟 

分 类 号：TD712.7[矿业工程—矿井通风与安全]