Ⅱ类自燃煤层自燃氧化规律分析

Analysis on Spontaneous Combustion Oxidization Law of Ⅱ Type Spontaneous Combustion Seam

针对Ⅱ类自燃煤层易发生煤炭自燃的现状,以袁店一矿1023工作面所属10号煤层为研究对象,对1023工作面采空区煤炭的自燃氧化规律进行了研究。通过在采空区埋设抽气管路,测定采空区温度以及O2、CO2浓度等在工作面推进过程中的动态变化并进行分析。结果表明:采空区内CO2浓度分布符合'一源一汇'工作面的采空区漏风流场分布规律,且回风侧比进风侧更早进入窒息带;采空区自燃'三带'的具体分布范围:散热带距工作面中部距离为0~18.8 m,自燃带距工作面中部距离18.8~71.1 m,窒息带距工作面中部距离大于71.1 m,依据划分的自燃'三带'范围计算出该工作面最低适宜回采速度为42 m/月。

According to the status of Ⅱ type spontaneous combustion seam easy to cause a coal spontaneous combustion,taking No.10 seam of No.1023 coal mining face in Yuandian No.1 Mine as a study object,a study was conducted on the spontaneous combustion oxidization law of coal in the goaf of No.1023 coal mining face.With the gas drainage pipeline in the goaf,the goaf temperature was measured and the dynamic variation of O2 ,CO2 density and others in the goaf with the coal mining face advanced were measured and analyzed.The results showed that the CO2 concentration distribution within the goaf could meet the air leakage filed distribution law of the goaf in the coal min-ing face with one source and one integration,and the air returning side would become a suffocation zone earlier than the air income side. The distribution scope of the spontaneous combustion three zones in the goaf would be that the no combustion zone was in a distance of 0~18.8 m to the central part of coal mining face,the spontaneous combustion zone was in a distance of 18.8~ 71.1 m to the central part of coal mining face and the suffocation zone was in a distance over 71.1 m to the central part of coal mining face.In accordance with the scope of the divided spontaneous combustion three zones,the lowest suitable mining speed of coal mining face calculated was 42 m/ month.