煤矿掘进机外喷雾装置设计及应用

Design and Application of Outer Spray Device for Coal Mine Boring Machine

针对当前综掘工作面掘进机外喷雾装置耗水量大、降尘效率低的问题,设计一种新型外喷雾装置.该装置采用内混式空气辅助雾化喷嘴,具有耗水量低、雾化效果好、降尘效率高等优点.运用数值模拟方法,对不同喷嘴布置方案和不同供水压力下掘进机外喷雾装置的喷雾场进行对比分析,得到外喷雾装置在不同工况下雾化特性的变化规律,最后应用于现场并测试实际降尘效果.现场测试结果表明:该装置能有效降低掘进机作业工作面内的粉尘浓度,其中全尘和呼吸性粉尘的降尘效率分别为90.9%和77.1%.

Aiming at the problems of high water consumption and low dust removal efficiency of the current external spray device of roadheader in comprehensive excavation face,a new type of external spray device is designed.The device adopts internal mixing air-assisted atomizing nozzle,which has the characteristics of low water consumption,good atomization effect and high dust removal efficiency.The optimal arrangement of nozzle and operating condition of the device are obtained by numerical simulation.It is applied to the scene,testing the dust removal efficiency.Results show that the device can effectively reduce the dust concentration in the working face of the road header,and the dust removal efficiency of the total dust and respirable dust are 90.9%and 77.1%,respectively.