大倾角综放面尘源特性与抑尘引射除尘系统研究

考虑大倾角综放面生产条件复杂,采煤机产尘量大,放煤口处的粉尘易扩散,运用现场测试与实验分析相结合的方法对采煤机割煤时产尘量和粒径分布进行研究,对采煤机割煤工序浮尘量与落尘量进行了测算,设计了集抑尘、强化喷雾除尘和尘流控制的大倾角综放工作面采煤机抑尘引射除尘系统,并进行现场试验应用。结果表明:采煤机割煤时产生的粉尘近一半为浮尘,粉尘中位粒径为8.22μm,呼吸性粉尘约占全尘的44.5%,应重点防治。采煤机抑尘引射除尘系统对呼吸性粉尘的除尘效率由原来的49.5%提高到了65.3%。通过在液压支架上安装喷雾喷嘴和引射除尘器,对全尘的除尘效率由69.4%提高到85.7%。该方法可为大倾角综放工作面放煤口位置处的粉尘防治提供参考。

Research on Dust Source Characteristics and Suppression Ejector Systems in High Inclination-angle Fully Mechanized Caving Face

In consideration of the fact that the production conditions of high inclination-angle fully mechanized caving face is complicated，coal winning machine produces a great quantity of dust，and the caving coal dust is easy to float in the sky.In combination of field measurement and experimental analysis，a research on dust producing quantity and particle size distribution was conducted on coal mining machine，and the floating dust amount and fall dust amount of coal winning machine are calculated by measuring in caving face.The suppression ejector systems in high inclination-angle fully mechanized caving face is designed，which can prevent dust from floating in the sky，strengthen the spray dusting and dust flow control.And then，it was applied to caving faces.The results showed that about half of dust produced by coal machine is floating dust with the dust median diameter of 8.22 μm，and the respirable dust accounted for 44.5% of all the dust.It should be focused on.The respirable dust collection efficiency with coal mining machine suppression ejector systems is improved from 49.5% to 65.3%.In combination of ejector spray filter and nozzle installation in hydraulic support，the whole dust collection efficiency is improved from 69.4% to 85.7%.This technique may provide a reference for the dust prevention in caving coal location of high inclination-angle fully mechanized caving face.