摘要
煤层自燃严重影响着矿井的安全生产,为实现对杭来湾煤矿3号煤层自燃全过程的精准预测,利用程序升温试验优选出了煤层自然发火标志气体,结合现场测试确定煤自燃初期适用的标志气体,并通过数学模型得到采空区不同自燃阶段上隅角、回风巷等地点的CO指标临界值。结果表明:CO可作为煤自燃初期的主要标志气体,C_(2)H_(4)和C_(2)H_(6)可作为煤自燃加速氧化阶段的标志气体,C_(2)H_(2)可作为煤自燃激烈氧化阶段的标志气体;采空区高温区煤温达到50℃、70℃、100℃时,上隅角CO预测浓度分别为56×10^(-6)、756×10^(-6)、5000×10^(-6),回风巷CO预测浓度分别为6×10^(-6)、76×10^(-6)、500×10^(-6)。据此建立了煤自燃全过程精准预测预报指标体系,并通过现场测试取得了良好的应用效果。
The spontaneous combustion of coal seam seriously affects the safe production of the mine.In order to realize the accurate prediction of the whole process of spontaneous combustion of No.3 coal seam in Hanglaiwan Coal Mine,the programmed temperature rise experiment was used to select the spontaneous combustion marker gas of coal seam.Combined with the field test,the suitable marker gas in the initial stage of coal spontaneous combustion was determined,and the critical value of CO index in the upper corner and return airway of different spontaneous combustion stages in goaf was obtained by mathematical model.The results show that CO can be used as the main marker gas in the early stage of coal spontaneous combustion,C_(2)H_(4) and C_(2)H_(6)can be used as the marker gas in the accelerated oxidation stage of coal spontaneous combustion,and C_(2)Hz can be used as the marker gas in the intense oxidation stage of coal spontaneous combustion.When the coal temperature in the high temperature zone of the goaf reaches 50℃,70℃and 100℃,the predicted concentrations of CO in the upper corner are 56 ×10^(-6),756 ×10^(-6) and 5000X 10-6,respectively,and the predicted concentrations of CO in the return airway are 6×10^(-6),76×10^(-6) and 500×10^(-6),respectively.An accurate prediction index system for the whole process of coal spontaneous combustion was established,and good application results were achieved through field tests.
作者
叶正亮
龚选平
尚博
胡冕
YE Zhengliang;GONG Xuanping;SHANG Bo;HUMian(China Coal Energy Research Institute Co.,Ltd.,Xi'an,Shaanxi 710054,China)
出处
《矿业研究与开发》
CAS
北大核心
2023年第9期141-145,共5页
Mining Research and Development
关键词
自然发火
标志气体
临界值
指标体系
Spontaneous combustion
Marker gas
Critical value
Index system
