沿空留巷Y型通风瓦斯运移规律及风量调控研究
Research on gas transportation law and air volume regulation of Y-type ventilation along gob-side entry retaining
邓博知 1夏晓峰 1聂百胜 1周皓文 1靳崇亮2
作者信息
- 1. 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044;重庆大学资源与安全学院,重庆 400044
- 2. 山西焦煤汾西矿业东瑞煤业,山西 临汾 042404
- 折叠
摘要
沿空留巷Y型通风"两进一回"工作面和采空区尾巷存在瓦斯涌出问题,当瓦斯超限时,易诱发瓦斯爆炸等灾害.以山西东瑞煤矿沿空留巷工作面为研究对象,利用Fluent数值模拟软件,模拟沿空留巷Y型通风瓦斯运移基本规律,分析不同通风条件对瓦斯浓度分布的影响.结果表明:增加运输巷道风量使沿空留巷瓦斯浓度降低,增加辅运巷道风量使工作面瓦斯浓度降低;当总风量不变时,2条进风巷道的风量配比对工作面瓦斯浓度影响较大,对采空区瓦斯浓度影响相对较小.随着采煤工作面推进距离的增加,沿空留巷和工作面的瓦斯治理难度上升,最佳通风配比量由运输巷道向辅运巷道倾斜.在煤矿开采过程中,应不断调节进风巷风量配比来预防工作面和尾巷的瓦斯浓度升高,同时,还应提高采空区密闭程度、加强采空区的漏风管理.
Abstract
There is gas outflow from the Y-type ventilation"two-in-one-return"working face and the tailing lane of the mining area,which could result to disasters such as gas explosions induced by gas overloading.This paper takes Shanxi Dongrui coal mine working face of gob-side entry retaining as the research object.Fluent numerical simulation software was applied to simulate the basic law of gas transport of gob-side entry retaining Y-type ventilation.The influence of different ventilation conditions on the distribution of gas concentration was analyzed.The results show that:increasing the air volume of the transportation roadway reduces the gas concentration along the open roadway,and increasing the air volume of the auxiliary transportation roadway reduces the gas concentration in the working face.As the total air volume is constant,changing the air distribution ratio of the two inlet roadways has a greater impact on the gas concentration in the working face.The impact on the air mining area is relatively small.Increment of the advancement progress of the coal mining face,the difficulty of gas management retaining lanes and the working face rises.The optimal ratio of ventilation moved from the transportation lanes to the auxiliary transportation lanes.In the process of mining,the ratio of air volume in the inlet road to prevent the gas concentration in the working face and the tailing road from increasingshould be constantly adjusted.Improvement of the degree of airtightness of the gob area by regulating the air quantity to prevent the gas accumulation.
关键词
沿空留巷/瓦斯运移规律/Y型通风/瓦斯防控/数值模拟/风量配比Key words
gob-side entry retaining/gas moving law/Y-type ventilation/gas prevention and control/numerical simulation/air volume distribution引用本文复制引用
基金项目
国家重点研发计划子课题(2022YFC3004701)
出版年
2024
NETL
NSTL
万方数据