低含量高瓦斯涌出量工作面煤层瓦斯治理技术
Coal seam gas control technology in working face with low content and high gas emission
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摘要: 为解决大采高综放工作面高强度开采引起的瓦斯涌出增高的问题,从大采高综放工作面的瓦斯涌出规律入手,利用分源预测法分析工作面瓦斯涌出的来源,运用FLEUNT软件模拟瓦斯赋存及流场分布,实测工作面瓦斯涌出情况,优化瓦斯抽采方法,提出利用专用瓦斯巷道密闭大流量瓦斯的治理方法,优化工作面风流路线,改变采空区瓦斯向上隅角和采空区涌出的路径。结果表明:专用瓦斯巷道密闭大流量瓦斯的治理方法能够从总量上减少工作面瓦斯向开采空间涌出,抽采期间,试验8103工作面上隅角瓦斯浓度为0.3%~0.7%之间;回风巷瓦斯浓度在0.4%以下;支架后溜通道放煤时瓦斯浓度降到0.5%以下,消除了放煤时后溜通道瓦斯超限现象。
Abstract: In order to solve the problem of increasing gas emission caused by ultra-high intensity mining in fully mechanized top coal caving face with large mining height, starting from the gas emission law of fully mechanized caving face with large mining height, the source of gas emission in working face is analyzed by branch prediction method, gas occurrence and flow field distribution are simulated by FLUENT software, the gas emission situation of working face is measured, and the gas drainage method is optimized. The control method of large flow gas in gas roadway is used to optimize the air flow route of working face, and change the path of gas emission from goaf to upper corner and goaf. The results show that: the special gas roadway closed large flow gas control method can reduce the total amount of gas emission from the working face to the mining space. During the drainage period, the gas concentration in the upper corner of 8103 working face is between 0.3% and 0.7%; the gas concentration in the return air roadway is below 0.4%; the gas concentration in the back chute of the support is reduced to less than 0.5%, which eliminates the gas overrun in the back chute during coal caving.
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