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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.
In order to analyze the danger of gas explosion in the closed process of fire area, the heat balance method was used to study the danger of methane explosion under the influence of flue gas during the closed process. The mathematical model of methane explosion and the closed process under the influence of CO2 and CO The evolution model of gas composition in the middle fire zone, and the numerical analysis of the change of the main gas volume fraction during the sealing process was carried out by using FLUENT software. On this basis, the danger of methane explosion in the sealing process was analyzed, and the risk of methane explosion The results show that the lower bound of methane explosion is greatly affected by the volume fraction of CO due to the presence of multi-component flue gas during the sealing process, while the upper bound of methane explosion is sensitive to the changes of CO2 volume fraction . During the process of the fire zone closure, the combustion state of the fire source increased greatly from the oxy-fuel combustion to the hazardous area of methane explosion after the fuel-rich combustion. It was concluded that the gas explosion hazard areas during the closure process were mainly distributed near the location of the fire source and the goaf In the wind side, the danger zone of explosion in the area of gob area fire will last longer and the explosion risk will be greater.