煤矿火区密闭过程自燃诱发瓦斯爆炸的规律研究

The law of methane explosion induced by spontaneous combustion process in closed fire zone of coal mines

为了研究煤矿火区安全封闭技术,进行了火区封闭过程诱发瓦斯爆炸的规律研究。对火区封闭过程中的自燃诱发爆炸的数学物理模型进行了分析,主要涉及巷道流场模型、采空区自燃模型、采空区瓦斯运移模型、瓦斯爆炸模型。以黑龙江鹤岗矿业集团兴安矿综采工作面停采封闭火区期间发生爆炸事故为原型,对火区封闭过程诱发瓦斯爆炸进行研究。得出,火区封闭过程中的风速下降,会引发巷道或采空区瓦斯积聚现象,高温火源存在的情况下易引发瓦斯爆炸事故。瓦斯积聚区与高温区存在较大的距离时,积聚瓦斯运移到高温区域引发爆炸;瓦斯积聚区与高温区距离非常近时,高温烟气逆向运移到瓦斯积聚区引发瓦斯爆炸;采空区自燃火势如果加强,也有可能引发采空区瓦斯爆炸。为了保证自燃火区密闭过程安全性,密闭期间应加强通风,增加进回风密闭间的风压,保持进回风密闭构筑的同步性。

The law of methane explosion induced by self-combustion during the closing process of fire zones was studied to develop the safe closing technology in fire zones.The physical and mathematical model of explosion induced by spontaneous fire,mainly related to roadway flow model,spontaneous combustion model and methane migration model of vacant places and methane explosion model,was analyzed.An explosion in Xing＇an Coal Mine of Hegang Mining Group was studied as an example to study the law of explosion during fire zone closing period.The results show that the wind velocity decrease during fire zone closing will cause methane accumulation,and explosion will happen if there is fire source;if methane accumulated area has a great distance to high temperature zones,explosion may happen if accumulated methane moves to high temperature areas;if the fire strengthened,explosion may also happen.In order to ensure the safety of fire zone close process,ventilation should be strengthened,the air pressure in closed zones should be increased,and the closed building should be kept synchronously.