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Title
Formation law and prevention technology of low oxygen hidden danger in upper corner of shallow coal seam working face
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作者
苗宇岐李琨辛毅赵强强
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Author
Miao Yuqi;Li Kun;Xin Yi;Zhao Qiangqiang
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单位
山西晋神沙坪煤业有限公司
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Organization
Shanxi Jinshen Shaping Coal Industry Co., Ltd.
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摘要
为解决沙坪煤业工作面上隅角有害气体积聚及低氧现象频发的问题,综合分析了上隅角低氧隐患形成的原因,通过设置测点取样,检测上覆采空区及本煤层工作面的气体组分变化,从而揭示出采空区气体的分布规律。结果表明,煤层原生赋存及采空区浮煤常温氧化是低氧气体的主要来源,由于地表裂隙供氧,上覆煤层采空区的浮煤氧化生成大量低氧气体,通过裂隙进入8号煤层采空区,再通过工作面的漏风通道涌出到工作面,风流汇集到上隅角,导致低氧现象的发生。提出井上下封堵漏风通道和优化通风管理方面的措施,减少向采空区供氧,阻断低氧气体的运移途径,可有效防止上隅角低氧及有害气体积聚。
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Abstract
In order to solve the problem of harmful gas accumulation and low oxygen phenomenon in the upper corner of the working face of Shaping Coal Industry, the causes of the formation of low oxygen hidden danger in the upper corner are comprehensively analyzed. By setting the measuring point sampling, the gas composition changes in the overlying goaf and the working face of the coal seam are detected, so as to reveal the distribution law of gas in the goaf. The results show that the primary occurrence of coal seam and the oxidation of floating coal in goaf at room temperature are the main sources of low oxygen gas. Due to the oxygen supply of surface cracks, a large amount of low oxygen gas is generated by the oxidation of floating coal in the goaf of overlying coal seam into the goaf of No.8 coal seam through cracks, and then flows out to the working face through the air leakage channel of the working face, and the air flow converges to the upper corner, resulting in the occurrence of low oxygen phenomenon. Finally, the measures of plugging the air leakage channel and optimizing the ventilation management are put forward to reduce the oxygen supply to the goaf and block the migration path of low oxygen gas, which can effectively prevent the hidden danger of low oxygen and harmful gas accumulation in the upper corner.
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关键词
上隅角低氧浅埋深煤层采空区漏风通道优化通风
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KeyWords
upper corner hypoxia;shallow buried deep coal seam;goaf;air leakage channel;optimize ventilation
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DOI
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引用格式
苗宇岐,李 琨,辛 毅,赵强强. 浅埋煤层工作面上隅角低氧隐患形成规律及防治技术[J]. 煤炭与化工, 2023, 46(10): 127-131,136..
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Citation
Miao Yuqi, Li Kun, Xin Yi, Zhao Qiangqiang. Formation law and prevention technology of low oxygen hidden danger in upper corner of shallow coal seam working face. CCI, 2023, 46(10): 127-131,136..