摘要
采空区涌出瓦斯是采煤工作面瓦斯重要来源之一,合理的采空区抽采方案可有效解决工作面瓦斯超限问题。本文结合数值模拟与现场应用对神东布尔台矿42号上煤层综放工作面采空区瓦斯插管抽采系统进行优化。首先,利用流体模拟软件FLUENT模拟采场瓦斯运移特征,考虑了采空区遗煤解吸和上邻近层的瓦斯涌出,揭示了采空区瓦斯浓度分布规律,并分析了抽放口与回风隅角距离、抽采负压和不同配风比对抽采效果的影响,提出抽采优化方案。然后,将优化方案进行现场应用,重点考察了抽放口与回风隅角距离和抽采负压,得出当插管间距为70 m、抽采负压为12~18 kPa时,抽采效果较好。研究结果对高产高效低瓦斯矿井采空区瓦斯抽采方案优化具有理论和现实意义。
Gas emission from the goaf is one of the important sources of gas in the working face and a reasonable goaf drainage scheme can effectively solve the problem of gas overrun in working face.Combined with numerical simulation and field application,the gas intubation extraction system in the gob of the fully mechanized caving face in 42-top coal seam of Buertai Coal Mine is optimized in this paper.Firstly,the FLUENT fluid simulation software is utilized to simulate the characteristics of gas migration in the stope,considering the desorption of the remaining coal in the goaf and the gas emission from the upper adjacent layer.The distribution laws of gas concentration in the goaf are revealed,and the influence of the distance between the extraction outlet and the air-return corner,drainage negative pressure and air supply ratio on the extraction effect are analyzed,the optimized scheme of extractionis proposed accordingly.Then the optimization scheme is applied on the spot,focusing on the distance between the extraction outlet and the air-return corner and negative pressure.It is concluded that when the intubation distance is 70 m and negative pressure is 12~18 kPa,the extraction effect is better.The research results have theoretical and practical significance for the optimization of gas drainage scheme in goaf of high yield,high efficiency and low gas mines.
作者
周爱桃
张蒙
王凯
陶博
Zhou Aitao;Zhang Meng;Wang Kai;Tao Bo(School of Emergency Management and Safety Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China)
出处
《矿业科学学报》
2020年第3期291-301,共11页
Journal of Mining Science and Technology
基金
国家自然科学基金(51774292)。
关键词
综放工作面
采空区瓦斯抽采
遗煤解吸
数值模拟
现场应用
fully-mechanized caving face
gas drainage in goaf
desorption of residual coal
numerical simulations
field application
