基于遗煤自燃与瓦斯爆炸耦合数值模拟研究
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内蒙古科技大学矿业与煤炭学院

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X936

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国家自然科学基金项目(52064043, 51764044)资助;内蒙古自然基金项目(2020MS05010)资助;内蒙古科技大学矿山安全与地下工程院士专家工作站建设项目资助;内蒙古煤炭绿色开采与绿色利用协同创新中心项目资助。


Numerical Simulation of Nitrogen Injection Technology in Goaf Based on Coupling Relationship Between Spontaneous Combustion and Gas Explosion of Abandoned Coal
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School of Mining and Coal, Inner Mongolia University of Science and Technology

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    摘要:

    采空区遗煤自燃与瓦斯爆炸两者存在复杂的耦合关系易联锁发生,影响煤矿安全生产,以乌海某矿1012工作面为研究背景,提出向采空区注N2以减少事故的发生。为探究合理注氮方案,利用FLUENT模拟技术,分析不同注氮方案下采空区氧浓度与瓦斯浓度场的分布情况,并确定其各类危险区面积,后使用隧道工程安全评价法确定其各自区域对应系数,在二者基础上求出不同注氮方案对应的危险程度分数,并使用origin求出其耦合函数,根据其函数确定最佳注氮方案是注氮量为379m3/h,注氮位置位于工作面58m处,最终对其方案进行工程实测验证得出其防治效果良好。研究结果表明:本文利用采空区氧化升温带的氧气浓度确定其合理注氮量为379m3/h,在该注氮量时随着注氮位置向采空区内部移动,危险程度分数呈先减小后增大的趋势,并确定其最佳注氮位置为距离工作面58m的采空区进风侧内部,其研究成果可为类似工程提供借鉴。

    Abstract:

    There is a complex coupling relationship between spontaneous combustion of coal and gas explosion in goaf, which is easy to interlock and affect the safety of coal mine production. Taking 1012 working face of a mine in Wuhai as the research background, it is proposed to inject N2 into goaf to reduce the occurrence of accidents. In order to explore reasonable nitrogen injection schemes, FLUENT simulation technology was used to analyze the distribution of oxygen concentration and gas concentration fields in goaf under different nitrogen injection schemes, and determine the areas of various danger zones. Then, the tunnel engineering safety evaluation method was used to determine the corresponding regional coefficients, and the risk degree scores corresponding to different nitrogen injection schemes were calculated on the basis of the two. origin was used to calculate its coupling function. According to its function, the optimal nitrogen injection scheme was determined that the nitrogen injection amount was 379m3/h, and the nitrogen injection position was located at 58m of the working face. Finally, the engineering field measurement of the scheme proved that its control effect was good. The results show that: In this paper, the oxygen concentration of the goaf oxidation heating zone is used to determine the reasonable nitrogen injection amount of 379m3/h. At this nitrogen injection amount, as the nitrogen injection position moves to the inside of the goaf, the risk degree fraction decreases first and then increases. The optimal nitrogen injection location is determined to be the inside of the goaf inlet wind side 58m away from the working face, and the research results can provide reference for similar projects.

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  • 收稿日期:2023-01-10
  • 最后修改日期:2023-01-18
  • 录用日期:2023-01-29
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