金佳矿采空区瓦斯运移与煤自燃规律研究与实践

Study and Practice of Gas Migration and Coal Spontaneous Combustion Law in Gob in Jinjia Coal Mine

针对煤矿抽放采空区瓦斯和减少漏风防止采空区煤氧化自燃的矛盾,研究了开采过程中采空区瓦斯运移及遗煤氧化自燃规律。采用全面布点的方法测量工作面采空区气体成分和浓度,分析得出瓦斯运移规律和"三带冶情况;根据所得数据和分析结果,建立模型并应用FLUENT对采空区瓦斯分布状态和漏风情况进行数值模拟,得到渐变供风量下的可能自燃带范围和瓦斯涌出的变化规律,并据此得到同时满足防止瓦斯浓度超限和煤自燃要求的安全风量。

In this paper, study was carried out on the law of gas migration and residual coal spontaneous combustion in gob during coal mining to counter the contradictions between the gas drainage from gob and the air leakage reduction for the prevention of coal spontaneous combustion in gob. The gas composition and concentration in the working face were measured with the method of laying monitoring points along the whole face and the law of gas migration and coal spontaneous combustion and the distribution of ＂three zones＂ in the gob were found out by analysis. Based on the field measured data and analysis results, a model was set up and numerical simulation was conducted on the gas distribution and air leakage in the gob with FLUENT software, the variation law of spontaneous combustion zone and gas emission in the state of gradually-changing air supply was obtained and on this basis, the safe air quantity that can simuhaneously meet the requirements for preventing disallowed gas concentration and coal spontaneous combustion in the working face was gotten.