摘要
高瓦斯易自燃矿井在采空区上覆邻近层瓦斯抽采的过程中,会对采空区漏风流场和气体体积分数场产生重要影响,进而影响采空区煤自然发火状态。为此,以山西省潞安温庄煤矿15102号工作面为研究背景,高位抽采钻孔对采空区煤自燃影响进行数值模拟研究。研究结果表明,在初始条件下未抽采的采空区进风侧自燃带宽度仅为44 m,但在采空区上隅角瓦斯出现超限现象;在高位抽采钻孔布置方式条件下,上隅角瓦斯体积分数下降明显,抽采效果显著,但各区域氧化带宽度均增加。因此,本研究表明,在进行采空区瓦斯抽采防治煤自燃的过程中,要时刻关注抽采对采空区煤自燃的影响,采取有力措施,避免煤自燃事故的发生。
During the process of gas extraction in the upper adjacent strata of goaf,the gas leakage flow field and gas concentration field in the goaf will be greatly affected,and then the spontaneous combustion of coal in the goaf will be affected.Based on No.15102 working face of Wenzhuang Coal Mine in Lu'an Chemical Group,Shanxi Province,the influence of high-level borehole on coal spontaneous combustion in goaf is studied by numerical simulation.The results show that under the initial conditions,the width of the air-measured spontaneous combustion zone in the goaf is only 44 m,but the gas in the upper corner of the goaf exceeds the limit,the gas concentration in the upper corner decreases obviously,and the effect of gas extraction is obvious,but the width of oxidation zone increases in all areas.Therefore,this study shows that in the process of gas extraction to prevent coal spontaneous combustion,we should always pay attention to the influence of extraction on coal spontaneous combustion in goaf,and take effective measures to avoid coal spontaneous combustion accidents.
作者
闫红卫
孙全吉
李博冉
YAN Hongwei;SUN Quanji;LI Boran(Wenzhuang Coal Industry Co.,Ltd.,Lu'an Chemical Group,Changzhi046300,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou221116,China)
出处
《煤》
2024年第8期11-16,共6页
Coal
基金
国家自然科学基金(52074285,51504251)。
关键词
高瓦斯
采空区
瓦斯抽采
煤自燃
high gas
goaf
gas extraction
coal spontaneous combustion
