煤矿长壁工作面瓦斯爆炸全尺寸模拟

doi:10.16265/j.cnki.issn1003-3033.2018.12.010

摘要/Abstract

摘要： 为丰富煤矿事故调查内容和有效应用矿井阻隔爆技术,利用气体爆炸数值模拟软件FLACS建立原型尺度的采煤工作面巷道模型进行数值模拟,并结合事故调查资料,研究瓦斯爆炸火焰、冲击波超压和动压在直巷、转角、分叉等巷道结构中的传播规律和破坏特征。结果显示:巷道分叉提供的自由空间可显著限制爆炸火焰传播;巷道分叉及转角能有效降低冲击波超压;冲击波动压气流速度衰减在巷道分叉处较为明显,但对直巷和转角不敏感;携残片和毒烟的动压高速气流是灾区远场的主要致灾因子。定量的数值仿真结果对认识矿井原型尺度下瓦斯爆炸传播规律、再现事故场景、优化阻隔爆设施布置有一定借鉴意义。

关键词: 瓦斯爆炸, 火焰传播, 超压, 动压, 煤矿安全

Abstract: For improving accident investigation and flame-proof technology application in coalmines, the gas explosion simulator-FLACS was used to model the full-scale longwall coalface and calculate the flame propagation, attenuations of shockwave overpressure and dynamic pressure on straight roadways, corners and bifurcations in a worst-case gas explosion based on the information from accident investigations. It was found that the free spaces provided by bifurcations limit the flame propagation obviously, that overpressure decays dramatically at corners and bifurcations, that the blast wind velocity just declines distinctly on bifurcations, and both corners and long straight roadway have little impact on it, and that the high-speed blast wind with debris and toxic smoke are the most important destructive factor at far field disaster areas. The quantitative results are helpful in percepting the full-scale gas explosion characteristics, rebuilding accident scenarios and optimizing flame-proof technology application.

Key words: gas explosion, flame propagation, overpressure, dynamic pressure, coalmine safety

中图分类号:

X932
TD712

刘如成, 朱云飞. 煤矿长壁工作面瓦斯爆炸全尺寸模拟[J]. 中国安全科学学报, 2018, 28(12): 58-64.

LIU Rucheng, ZHU Yunfei. Full-scale simulation of gas explosion at longwall coalface in coalmine[J]. China Safety Science Journal, 2018, 28(12): 58-64.

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