矿井火区封闭进程中瓦斯爆炸危险性的数值模拟分析

发布时间：2018-03-13 12:19

本文选题：火区封闭　切入点：瓦斯爆炸　出处：《中国矿业大学学报》2017年05期 　论文类型：期刊论文

【摘要】：为分析火区封闭过程瓦斯爆炸危险性,本文采用热平衡法对封闭过程中烟气影响条件下的甲烷爆炸危险性开展了研究,建立了CO2与CO影响下甲烷爆炸危险性变化数学模型和封闭过程中火区气体组分演化数学模型,并采用FLUENT软件对封闭过程中的主要气体体积分数变化进行了数值分析,在此基础上分析了封闭过程中甲烷爆炸的危险性,得出了甲烷爆炸危险区域位置分布规律和易爆炸时间节点.结果表明:封闭过程中由于受多组分烟气存在的影响,甲烷爆炸下限受CO体积分数的影响较大,而甲烷爆炸上限对CO2体积分数变化较为敏感;火区封闭过程中,火源燃烧状态由富氧燃烧变为富燃料燃烧后甲烷爆炸危险区域大范围增加,得出封闭过程中瓦斯爆炸危险区域主要分布在靠近火源位置和采空区回风侧,其中采空区火源位置的爆炸危险区域持续时间更长,爆炸危险度更大.
[Abstract]:In order to analyze the danger of gas explosion in the process of fire closure, the methane explosion hazard under the influence of flue gas during the process of sealing is studied by using the method of heat balance. The mathematical model of methane explosion risk change under the influence of CO2 and CO and the mathematical model of evolution of gas components in the fire zone during the sealing process are established. The variation of main gas volume fraction in the sealing process is numerically analyzed by using FLUENT software. On this basis, the danger of methane explosion during the sealing process is analyzed, and the distribution law of the dangerous area of methane explosion and the time node of easy explosion are obtained. The results show that the methane explosion is affected by the existence of multi-component smoke during the sealing process. The lower limit of methane explosion is greatly affected by CO volume fraction, while the upper limit of methane explosion is sensitive to the change of CO2 volume fraction. The dangerous area of methane explosion increases in a wide range after the combustion state of fire source is changed from oxygen-enriched combustion to fuel-rich combustion. It is concluded that the dangerous area of gas explosion is mainly located near the fire source and the return air side of goaf during the closed process. The explosion hazard area in the goaf is longer and the explosion risk is greater.
【作者单位】：中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室;中国矿业大学安全工程学院;
【基金】：国家自然科学基金项目(51104154,51134020) 中央高校基本科研基金项目(2011QNA05) 中国矿业大学大学生创新创业基金立项大学生创新项目(201403,201503)
【分类号】：TD712.7

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