红阳二矿12号煤层标志性气体实验研究

Experimental research on indicator gas of No.12 coal seam in Hongyang No.2 Mine

针对红阳二矿12号煤层遗煤氧化的规律与特点,有效地进行防灭火工作,掌握采空区中遗煤氧化的速度,对红阳二矿12号煤层进行了煤样升温氧化实验,在温度不断升高的过程中检测出CO与多种烯烃气体,并且在不同温度下煤体析出气体的速度不同,最终选择CO、C2H4、C2H2作为标志性气体,产生的临界温度分别为59、176、403℃。在采空区检测出CO气体,说明采空区遗煤进入快速氧化阶段;检测出C2H4气体时,遗煤进入剧烈氧化状态;检测出C2H2气体时,说明采空区中已经产生明火,井下人员需要迅速撤离。通过煤体标志性气体的确定,建立12号煤层自燃预警系统,保证井下工作人员的生命安全与能源的充分利用。

Aiming at the oxidation laws and characteristics of the remaining coal in the No.12 coal seam of Hongyang No.2 Mine,effectively preventing and extinguishing fires,and grasping the speed of oxidation of the remaining coal in the goaf,conducted a coal sample heating and oxidation experiment on the No.12 coal seam of Hongyang No.2 Mine.CO and a variety of olefin gases were detected during the process of increasing temperature,and the rate of gas evolution from coal at different temperatures was different.Finally,CO,C2H4,C2H2 were selected as the indicator gas.The critical temperatures generated were 59,176,and 403 ℃ respectively.CO gas was detected in the goaf,indicating that the leftover coal in the goaf had entered a rapid oxidation stage;when C2H4 gas was detected,the leftover coal entered a violent oxidation state;when C2H2 gas was detected,it meant goaf open flames had been generated in the area,and underground personnel needed to evacuate quickly.Through the identification of indicator gases in the coal body,an early warning system for the spontaneous combustion of the No.12 coal seam was established to ensure the safety of underground workers and the full use of energy.