被保护层回采下伏采空区遗煤自燃防治技术

Control Technology of Coal Spontaneous Combustion in Underlying Goaf During Protected Seam Mining

上覆13125被保护层工作面回采一定距离后通过裂隙与下伏13165采空区导通,为了解决下伏煤层采空区因漏风致使遗煤氧化产生的一氧化碳随上隅角留管瓦斯抽采流动至13125工作面留管的问题,提出了注水降温技术,施工钻孔对13165采空区顶部进行注水研究。结果表明:通过注水降温后13125工作面上隅角留管检测出的一氧化碳由注水前最高116×10^(-6)降至8×10^(-6);在随着钻孔的数量增加,注水量随之加大,留管内一氧化碳也随之下降,防灭火效果显著。

The overlying 13125 protected mining face conducts underlying 13165 gob after a certain distance mining through the fissures. To solve the problem that the carbon monoxide produced by the residual coal oxidation due to underlying coal seam goaf flows to 13125 working face retention tube by gas extraction in upper corner retention tube, we proposed the water injection cooling technology, and carried out the water injection study at the top of 13165 goaf by boreholes. The results showed that the carbon monoxide detected by the corner retention tube on 13125 working surface after water injection and cooling was reduced to 8×10^（-6） from the maximum of 116×10^（-6） before water injection; with the increase of the number of drilling construction, the amount of water injection is increased, and the carbon monoxide in the tube is also decreased.