煤矿密闭多参数时变规律研究

Study on Time-varying Law of Multi-parameter Sealing in Coal Mine

为分析煤矿密闭区域内的煤自燃危险,以一煤矿典型密闭区域为例,通过监测地面大气压、井下密闭内外压力和气体体积分数,研究了地面大气压、密闭内静压、外静压、密闭内外压差与井下气体特征参数之间的相关性。研究结果表明,地面大气压与密闭内外压差,井下密闭内外压差与CH_(4)、O_(2)、CO等特征参数之间有紧密联系。地面大气压的变化趋势与密闭内外压差的变化趋势相反;密闭的内静压与外静压呈正相关关系,密闭的内外压差与外静压呈负相关关系;密闭内外压差与CH_(4)体积分数变化成正比,与O_(2)体积分数变化成反比。研究结果有助于为灾害气体防治提供理论支持。

In order to analyze the coal spontaneous combustion risk in the closed area of a coal mine,the correlation between the surface atmospheric pressure,the static pressure in the closed area,the static pressure in the closed area,the pressure difference inside and out-side the closed area and the characteristic parameters of the underground gas was studied by monitoring the surface atmospheric pres-sure,the pressure inside and outside the closed area and the gas volume fraction.The results show that the surface atmospheric pressure is closely related to the pressure difference inside and outside the enclosure,and the pressure difference inside and outside the enclosure is closely related to the characteristic parameters such as CH_(4),O_(2)and CO.The variation trend of the surface atmospheric pressure is op-posite to that of the pressure difference inside and outside the enclosure.The closed internal static pressure is positively correlated with the external static pressure,and the closed internal and external pressure difference is negatively correlated with the external static pres-sure.The pressure difference between inside and outside the seal is proportional to the change of volume fraction of CH_(4)and inversely proportional to the change of volume fraction of O_(2).The results are helpful to provide theoretical support for disaster gas control.