下分层采煤工作面回撤期间自然发火防治技术

Technology of Spontaneous Combustion Prevention and Control During Withdrawing Period in Lower Layered Coal Mining Face

为治理下分层采煤工作面回撤过程中由于遗煤二次氧化、漏风等问题导致的工作面自然发火,以北马坊煤矿2134下分层采煤工作面为研究对象,分析其回撤期间CO浓度异常的原因是2114上分层工作面采空区遗煤氧化升温,发生CO涌出。通过采取工作面正压通风、上分层采空区注浆、架后钻孔注高分子胶体防灭火材料等综合防灭火技术,抑制了自然氧化升温过程的发展,使CO体积分数下降至100×10-6以下,并保持稳定。

In order to control the hidden danger of spontaneous combustion caused by secondary oxidation of residual coal,air leakage and other issues during the withdrawing period in lower layered coal mining face,take No. 2134 lower layered coal mining face in Beimafang Coal Mine as a study object. The analysis results showed that the residual coal heating and oxidation,CO emissions in the goaf of No. 2114 higher layered coal mining face,which caused the CO concentration abnormal. Through taking comprehensive fire preventing and extinguishing technologies with positive pressure ventilation in the coal mining face,grouting in the goaf of higher layered coal mining face,grouting polymer gel fire prevention materials through boreholes behind the supports and others,the development of natural oxidation and heating was inhibited,the CO concentration was decreased to 100 × 10- 6and keep stable.