高瓦斯近距离煤层群易自燃工作面回撤防火关键技术研究

为了确保屯宝煤矿10115工作面安全回撤，通过采取注氮、注浆、堵漏风、自燃预测预报等多种方法，对10115工作面撤架密闭期间自燃综合防治措施进行研究，结果表明：终采撤架期间和撤架密闭后，CO、O2、CH4等气体指标都处于较安全的范围内，说明采取的综合防灭火措施对采空区遗煤低温氧化起到很好的防治效果。

The Technology on Prevention for Spontaneous Combustion Working Face Retraction in high Gas adjacent Coal Seams

High gas mine working face is prone to spontaneous fire during stoppage of production and removal of support, thus causing gas explosion.There are some spontaneous combustion characteristics such as serious air leakage in the goaf, high temperature fire area near the goaf, and more residual coal in the goaf, etc. Nitrogen injection, grouting, wind plugging, spontaneous combustion prediction and other fire prevention were implemented.The gas monitoring results showecd that during the end of mining and removal of supports, the volume fraction of CO and O2 showed a trend of first low, then high and then low, and the CH4 volume fraction ranged from 0.5% and 1.3%.After air stopping, the concentration of CO and O2 ranged from 1×10-6 ~ 11×10-6 and 0.01% ~ 0.09% respectively.The concentration of CH4 ranged from 0.24% ~ 1.48%, it showed that comprehensive fire-fighting technology has a good inhibiting effect on the spontaneous combustion of goaf coal. The gas concentration of CH4 is in a safe range, which ensured the safety of the working face production.