破碎硐室粉尘质量浓度分布规律的实验研究

为了解决破碎硐室粉尘质量浓度超标的问题,获取通风除尘设计的合理参数,根据相似原理,结合气固两相流的运动方程,导出了模拟破碎硐室粉尘运动的相似准则数,以西石门铁矿27#破碎硐室为原型,建立了破碎硐室相似模型,并对粉尘质量浓度分布规律进行了实验研究.研究结果表明:粉尘质量浓度在破碎机下料口附近区域内达到最大值,并以该区域为中心径向逐步降低.入口风速越大,矿石含水率越高,粉尘质量浓度越低,且当矿石含水率达到3.02%后,粉尘质量浓度基本不再降低;安装抽风除尘系统后,粉尘质量浓度基本保持在2 mg/m3以内,平均除尘率高达90%以上.

Experimental Study on Dust Concentration Distribution in Crushing Chamber

In order to avoid the over-limit of dust concentration in crushing chamber and to obtain the rational parameters for the design of dust removal by ventilation， according to the similarity theory and the gas-solid two-phase flow motion equation， taking 27^# crushing chamber in Xishimen Iron Mine as the background， the similarity index was deduced and a similarity model device was designed for the specific situation in the crushing chamber. Meanwhile， the dust concentration distribution was studied. The results indicated that dust concentration reached the maximum value near the mouth region in the crusher， while it gradually reduced along the radial direction in this region. The higher wind velocity and ore moisture are， the lower the dust concentration is. In addition， when ore moisture reached the value of 3.02%， the dust concentration no longer reduced. After the installation of exhaust dedusting system， the dust concentration was below 2mg/m³， and the average removal rate reached 90%.