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通过在采空区预埋束管取样器,检测采空区内气体成分随工作面推进进度变化情况,对采空区内氧气的体积分数随深度的变化规律进行分析,根据所测的气体浓度,确定出王台矿2304采面采空区遗煤自燃氧化的“三带”分布状况,并利用FLUENT软件,依据达西定律,模拟研究了单一回风巷与工作面距离分别为80m、160m和240m3种情况下采空区流场的变化、氧气浓度场和CO浓度场的分布,分析了氧化带随工作面推进时的变化规律。结果表明:王台矿2304工作面采空区“三带”分别为散热带(0～38m)、氧化带(38～145m)和窒息带(>145m);单一回风巷采空区氧化带的宽度会随着回风巷距离工作面长度的增大而近似线形的增大。
Through the pre-buried pipette sampler in the goaf, the gas composition in the goaf is detected as the progress of the advancing progress and the variation law of the volume fraction of oxygen in the goaf with the depth is analyzed. According to the measured gas concentration , Determine the “three belts” distribution of coal spontaneous combustion of coal in the goaf of 2304 coal mining face of Wangtai Mine, and use FLUENT software, according to Darcy’s law, simulate the single return airway and working face distance are 80m , 160m and 240m3, the change of the flow field in the gob, the distribution of the oxygen concentration and the CO concentration were analyzed. The variation of the oxidation zone along with the working face was analyzed. The results show that the gob area of 2304 working face of Wangtai Mine is respectively 0 ~ 38m (0 ~ 38m), oxidation zone (38 ~ 145m) and asphyxiation belt (> 145m) The width of the oxidation zone will increase with the increase of the length of the working face from the air return lane approximately linearly.