露天煤矿破碎站受料斗粉尘扩散规律

Dust diffusion law of receiving hopper in crushing station of open-pit coal mine

露天煤矿破碎站煤炭卸料过程会产生大量粉尘并且向空气中扩散,对操作工人的身体健康和机械设备的使用寿命造成威胁,并对环境造成极大危害。粉尘扩散规律的研究对破碎站粉尘防治具有重要意义。本文采用现场测量和数值模拟相结合的方法,对粉尘颗粒在受料斗内部及外部区域的扩散规律进行了研究。结果表明,粉尘的扩散主要由10~100μm的颗粒引起。颗粒主要集中在受料斗壁面附近以上的区域。当卸料高度距受料斗上缘7.1 m处时,粉尘可以扩散到距受料斗上缘以上11 m的区域。

The coal unloading process in the crushing station of open-pit coal mine will produce a lot of dust and spread into the air,which will threaten the health of operators and the service life of large machinery,and cause great harm to the environment.The study of dust diffusion law is of great significance to the dust prevention and control of receiving hopper in crushing station.In this paper,the diffusion law of dust particles in the hopper and its vicinity is studied by means of field measurement and numerical simulation.The results show that the diffusion of dust is mainly caused by fine particles of 10-100μm.Particles are mainly concentrated in the area near the wall of the receiving hopper.When the discharging height is 7.1 m from the upper edge of the receiving hopper,the dust can spread to a height of 11 m above the upper edge of the receiving hopper.