浅埋深薄基岩下综采工作面回风隅角低氧治理

doi:10.16265/j.cnki.issn1003-3033.2022.S2.0134

摘要/Abstract

摘要：

为解决神东矿区浅埋深薄基岩下综采工作面回风隅角低氧的难题,以神东煤炭集团锦界煤矿低氧治理为背景,结合现场观测数据,从综采工作面通风方式、工作面漏风通道、大气压变化等方面详细分析综采工作面回风隅角低氧形成机制,得出综采工作面回风隅角低氧的原因,分别为岩层中存在的N₂、CO₂气体的涌入、采空区有漏风通道、工作面局部风流处于涡流状态难以进入到主风流、大气压降低等,同时针对上述原因提出降低采空区漏风及加强采空区浮煤管理,设置导风帘、加强工作面风量管理,设置支架后挡风装置、上下隅角充填堵漏,将U型通风方式调整为偏Y型通风方式或U+L型通风方式等治理回风隅角低氧的措施,并分析适用条件及优缺点,结果表明:通过调整通风方式、设置通风设施、施工密闭、留设煤柱、上下堵漏等优化通风系统的措施可以有效地解决工作面回风隅角低氧的问题,保证安全回采工作的顺利进行。

关键词: 薄基岩, 综采工作面, 回风隅角, 低氧, 采空区漏风, 通风方式

Abstract:

In order to solve the problem of low oxygen in return air corners in fully mechanized coal mining face under thin bedrock with shallow burial depth in Shendong mining area, the low oxygen treatment in Jinjie Coal Mine of Shendong Coal Group was taken as the background. According to data from field observation, the formation mechanism of low oxygen in return air corners in the fully mechanized coal mining face was analyzed. Specifically, the ventilation mode and air leakage channel of the fully mechanized coal mining face, as well as atmospheric pressure variation were discussed. It was concluded that the low oxygen in return air corners in the fully mechanized coal mining face was caused by the following reasons. On the one hand, these reasons included the influx of nitrogen and carbon dioxide in the rock formation, air leakage channels in the goaf, and a decrease in atmospheric pressure. On the other hand, the vortex state of local airflow in the working face made it difficult to enter the main airflow. In view of the above reasons, some measures to treat the low oxygen in return air corners were proposed. For example, air leakage in the goaf should be reduced, and the management of floating coal in the goaf needed to be strengthened. The air guide curtain should be set, and air volume management in the working face was supposed to be enhanced. The rear windproof curtain of the support was required, and the leakage in the upper and lower corners needed to be filled and plugged. In addition, it was necessary to adjust the U-type ventilation mode to the partial Y-type or U+L-type ventilation mode and analyze their applicable conditions and advantages and disadvantages. The results show that the low oxygen in return air corners in the fully mechanized coal mining face can be effectively treated by some measures to optimize the ventilation system. These measures include adjusting ventilation modes, setting ventilation facilities, ensuring construction sealing, reserving coal pillars, and plugging leakage in the upper and lower corners, so as to ensure the smooth progress of safe mining.

Key words: thin bedrock, fully mechanized coal mining face, return air corner, low oxygen, air leakage in the goaf, ventilation mode

孙长斌. 浅埋深薄基岩下综采工作面回风隅角低氧治理[J]. 中国安全科学学报, 2022, 32(S2): 136-141.

SUN Changbin. Low oxygen treatment of return air corners in fully mechanized coal mining face under thin bedrock with shallow burial depth[J]. China Safety Science Journal, 2022, 32(S2): 136-141.

图/表 5

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