针对龙华煤矿3-1煤层30106、30107工作面上部2-2煤层采空区高浓度CO气体有从工作面大量涌出的危险,采用灌注高分子发泡材料、注氮与局部正压通风技术,消除了高浓度CO的威胁;介绍了局部正压通风技术的实施步骤以及通风系统的调整方案;通过风压、风量以及上隅角CO浓度监测,综合评价了局部正压通风技术的实施效果。现场应用发现,采用局部正压通风技术可将本煤层与上部煤层采空区的压能差保持在约200Pa,能保证上隅角CO体积分数不超过24×10-6。

According to the danger of CO large emission from the coal mining face due to the high concentration CO gas in the goaf of the upper 2-2 seam of No.30 106 and No.30107 coal mining face in 3-1 coal seam of Longhua Mine, the polymer foam material injection, nitrogen injection and local positive pressure ventilation tec hnology were applied to eliminate the danger of the high concentration CO.The paper introduced the implemented steps of the local positive pressure ventilation techno logy and the adjustment plan of the ventilation system.With the monitoring and measuring of the ventilation pressure, ventilation quantity and the upper corner CO cont ent, the paper comprehensively evaluated the implemented effect of the local positive pressure ventilation technology.The site application showed that the application of the local positive pressure ventilation technology could keep the pressure energy difference between the mining seam and the goaf of the upper seam at about 200 Pa and could keep the CO content in the upper corner not over 24x10-6.

国家自然科学基金资助项目(50804022)；