贵州某矿采空区标志性气体优选及自燃“三带”划分

Optimum Selection of Signature Gas and Division of Spontaneous Combustion"Three Zones"in Goaf of a Mine in Guizhou Province

为解决贵州某矿采空区自然发火早期精准预测预报的难题,以该矿12501工作面采空区为研究对象,利用程序升温实验重点分析煤样在升温氧化过程中CO、CO_(2)、C_(2)H_(4)、C_(2)H_(6)等气体的变化规律,通过数值模拟及现场实测对采空区自燃“三带”进行了划分。结果表明:CO、C_(2)H_(4)、C_(2)H_(2)可作为自然发火标志气体,C_(2)H_(4)/C_(2)H_(6)可作为判别煤自然发火进程的辅助指标;散热带平均宽度约18 m,氧化带平均宽度约53 m,氧化带以外为窒息带;当采煤工作面的推进速度大于0.53 m/d时,采空区无自然发火危险;当工作面连续超过114 d时,推进速度均小于0.53 m/d,采空区将有自然发火危险。研究结果为贵州某矿煤层自燃预报提供了理论依据及数据参考,对防治煤层自燃具有重要意义。

In order to solve the problem of early and accurate prediction of spontaneous combustion in goaf of a certain mine in Guizhou Province,the Goaf of 12501 working face in the mine was taken as the research object,the variation law of CO,CO_(2),C_(2)H_(4),C_(2)H_(6) and other gases during coal oxidation at elevated temperature was analyzed by using programmed temperature experiment,the"Three zones"of spontaneous combustion in goaf are divided by numerical simulation and field measurement.The results show that CO,C_(2)H_(4),C_(2)H_(2) and C_(2)H_(4)/C_(2)H_(6) can be used as the auxiliary index to judge the process of spontaneous combustion,the average width of radiative zone is about 18 m,the average width of oxidation zone is about 53 m,and the outside of oxidation zone is asphyxiation zone.There is no danger of spontaneous combustion in goaf when the driving speed of coal face is greater than 0.53 m/d,and there is danger of spontaneous combustion in goaf when the driving speed is less than 0.53 m/d when the driving speed of coal face is more than 114 days.The research results provide theoretical basis and data reference for the prediction of coal spontaneous combustion in a mine in Guizhou,and they are of great significance for the prevention and control of coal spontaneous combustion.