摘要:
以乌兰煤矿II020803工作面为背景,采用理论分析、数值模拟和现场实测对近距离煤层采空区瓦斯抽采对注氮效果影响进行研究。研究结果表明:在遗煤氧化过程中会造成采空区内氧气浓度分布不均,氧气会从高浓度区域向低浓度区域扩散。在工作面正常推采过程中,可认为采空区内气体扩散与传热过程是稳态过程,最终会达到氧浓度扩散与反应的平衡。瓦斯抽采过程中,对于高浓度氮气聚集区,氮气能够起到惰化采空区的作用,但所惰化的区域较小。对于采空区深部区域,所注入的氮气并没有起到惰化的作用,仅起到代替采空区漏风,惰化效果不明显。
Abstract:
Taking Wulan Coal Mine II020803 working face as the background, the theoretical analysis, theoretical analysis, numerical simulation and field measurement were used to study the effect of gas extraction on nitrogen injection in close goaf of coal seam. The results show that during the oxidation process of residual coal, the distribution of oxygen concentration in the goaf is uneven, and oxygen will diffuse from the high concentration area to the low concentration area. In the normal working face mining process, it can be considered that the gas diffusion and heat transfer process in the goaf is a steady state process, and eventually the balance between oxygen concentration diffusion and reaction will be reached. In the process of gas extraction, nitrogen can play the role of inerting goaf for the area with high concentration of nitrogen, but the inerted area is small. For the deep goaf, the injected nitrogen does not play the role of inerting, but only acts as a substitute for air leakage in the goaf, and the inerting effect is not obvious.
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