巷道火区封闭气体运移数值模拟分析

Numerical simulation analysis of gas migration in closed fire zone of roadway

首先提出了对火区进行封闭并注入惰性气体的常用的矿井火灾综合救灾方法,然后运用Gambit建立了发生火灾巷道的三维物理模型,通过运用fluent软件对巷道封闭火区内气体进行三维数值模拟,得到了火区封闭30 s时(即进行注惰行为时)火区内温度场和组分(CH4,O2)浓度场的分布情况.最后,根据模拟结果,分析了火区内气体的运移规律,并通过分析得到了封闭30 s后火区内发生瓦斯爆炸的可能性,为封闭后注入惰性气体等后续救灾行为的研究提供了准备.

First,this paper presents the commonly used integrated method to prevent the mine fire disaster, i.e.close the fire zone and inject inter gas.Then it establishes a three-dimensional physical model of the fires roadway by using Gambit.Through the three -dimensional numerical simulations of gas in fire zone by using fluent software,it gets the distribution of the temperature and component（CH4 ,O2 ）concentration fields in the fire zone after closing the fire zone for 30 s （when injecting inert gas）.Finally,according to the simulation results,it analyzes the migration law of the gas in the fire zone,and gets the possibility of a gas explosion in the fire zone closed for 30 s,providing preparations for study of the subsequent behavior to prevent the disaster in the closed fire zone such as injecting inert gas.