唐口煤矿采空区注氮驱替瓦斯技术应用

Application of Nitrogen Injection and Gas Displacement Technology to Goaf of Tangkou Coal Mine

唐口煤矿6309轨道巷道紧临6308采空区,在轨道巷道施工期间极易出现瓦斯超限和采空区遗煤自燃的危险。为保证作业人员的安全以及防止采空区遗煤自燃,进行了自燃危险性分析,模拟了注氮技术对火灾防治的情况,通过6309轨道巷道内的高位钻孔向6308采空区内部注氮气实行对6308采空区内部的瓦斯置换,以实现驱替瓦斯以及降低采空区温度从而防止已开采采空区遗煤自燃的目的。通过效果可知:注氮技术实施后上隅角CO浓度下降了78%,瓦斯浓度下降了76%,CO2浓度下降了100%。

The 6309 track roadway in Tangkou Mine is adjacent to 6308 goaf,and excessive gas and spontaneous combustion of residual coal in the goaf are highly likely to take place during construction of the track roadway.In order to ensure the operators'safety and prevent spontaneous combustion of residual coal in goaf,the spontaneous combustion risk analysis is carried out and the nitrogen injection technology for fire prevention and control is simulated.The gas in 6308 goaf is displaced by nitrogen injected from high-level boreholes in 6309 track roadway and the goaf temperature is reduced so as to prevent spontaneous combustion of residual coal in the goaf.The results show that the CO concentration,gas concentration and CO2 concentration in the upper corner decrease by 78%,76%and 100%respectively after implementing the nitrogen injection technology.