分段注水技术在综掘工作面粉尘防治中的应用

Application of Segmented Water Injection Technology in Dust Prevention and Control in Fully Mechanized Excavation Face

南关矿6号煤层本身含水率较低,掘进面现场采用除尘风机具有一定的安全隐患,同时底板松软泥岩、黏土岩使得迎头喷雾降尘用水不宜过大,造成掘进工作面粉尘浓度较高。通过在掘进迎头采用以分段式注水技术为核心的防尘措施,并辅助采用机载泡沫除尘,可显著降低工作面粉尘浓度。掘进迎头分段注水后,煤层含水率增加1%以上,可从根本上降底粉尘产生量;使用泡沫除尘不仅可起到强化粉尘治理作用而且可降低降尘用水量,起到保护巷道底板防止软化底鼓的作用。现场应用后,综掘司机位置全尘、呼吸性粉尘浓度降低率分别为95.8%、94.8%;综掘机后5 m位置全尘、呼吸性粉尘浓度降低率分别为93.8%、92.2%,有效改善了作业面环境质量。

With low water content,dust removal fans on the tunneling face has certain safety hazards in No.6 coal seam of Nanguan Mine.At the same time,the soft mudstone and clay rock of the floor make the front-side spray dust reduction water should not be too large,resulting in high dust concentration in the tunneling work.By adopting dust prevention measures with segmented water injection technology as the core in the tunneling,and auxiliary use of airborne foam dust removal,the concentration of working dust can be significantly reduced.The water content of the coal seam increases by more than 1%after the head-on water injection in the tunnel,which can fundamentally reduce the amount of dust generated;the use of foam dust removal can not only strengthen the dust control effect,but also reduce the water consumption for dust suppression,and protect the roadway floor.After field application,the reduction rates of total dust and respirable dust concentrations at the driver's position are 95.8%and 94.8%respectively.The reduction rates of total dust and respirable dust concentrations at the 5 m position behind the fully mechanized excavator are 93.8%and 92.2%respectively,which improves the environmental quality of the work surface.