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珙泉煤矿3#煤层自然发火期短,与上覆2#煤层平均间距仅有1.4~2.4 m,自然发火严重。该煤层2273工作面受配风、巷道支护、回采推进等方面影响,回采期间面临典型易燃极近距离煤层群自然发火防治难题。该工作面通过建立超前监测、超前预防、应急处理等自然发火防治治理机制,采取加强巷道支护质量、封堵漏风通道、预防性注浆、预防性注氮、灌注液态二氧化碳等多种技术手段,成功处置了上覆2272老空区严重自燃隐患事故,保证了工作面的安全回采。
The spontaneous firing period of No.3 coal seam of Baquan Coal Mine is short, with an average distance of 1.4 ~ 2.4 m from that of overlying No.2 coal seam, which leads to serious natural fire. The coal seam 2273 working face affected by the distribution of wind, roadway support, mining and other aspects of the impact, during the mining face typical flammable extremely close coal seam natural fire prevention and control problems. The working face through the establishment of advanced monitoring, advanced prevention, emergency treatment and other natural fire prevention and control mechanisms, to take to enhance the quality of roadway support, plug the air leakage channel, preventive grouting, prophylactic injection of nitrogen, perfusion of liquid carbon dioxide and other technical means , Successfully disposed of the accident involving 2272 serious accidental spontaneous combustion in the old area and ensured the safe mining of the working face.