煤矿典型易燃极近距离煤层群自然发火防治技术

Fire Prevention and Control Technology for Spontaneous Combustion in Typical Easy Self-ignition and Very Short Distance Coal Seams of Coal Mine

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 combustion phenomenon in Gongquan 3#coal seam is serious due to the short period of spontaneous combustion and average interval of only 1.4 m to 2.4 m with the overlying 2#seam. The 2273 working face, under the impact of air distribution, roadway support, mining and advancing and other aspects, faces the typical spontaneous combustion prevention problem in flammable seam group during recovery period. By establishing advanced monitoring, advanced prevention, emergency treatment and other governance mechanisms for spontaneous combustion, the face, taking multiple technical means including strengthening the quality of roadway support, blocking leakage channel, preventive grouting, preventive nitrogen injection, priming liquid carbon dioxide, successfully disposes of serious self-ignition accidents of overlying 2272 old mined out area and ensures the safety of mining face.