皮带运输巷道粉尘质量浓度分布规律的数值模拟

Numerical simulation of dust concentration distribution regularity in a belt conveyer roadway

为了掌握皮带运输巷道粉尘质量浓度的分布规律,获取通风除尘设计的合理参数,以西石门铁矿提升车间系统40#皮带运输平巷为研究背景,依据气固两相流理论,运用计算流体力学的离散相模型对皮带运输巷道粉尘质量浓度进行数值模拟,并与现场实测的粉尘质量浓度分布情况进行对比分析,模拟结果与实测数据基本吻合.研究表明,运用欧拉--拉格朗日法对皮带运输巷道粉尘质量浓度分布规律进行模拟是可行的.在通风除尘设计中,当巷道风速为3 m.s-1时,排尘效果最好,粉尘质量浓度整体保持在3 mg.m-3以下;皮带运输速度为2.5 m.s-1时粉尘质量浓度较低;定期进行壁面洒水也能在一定程度上实现降尘目标.

In order to master the regularity of dust mass concentration distribution in a belt conveyer roadway and obtain rational parameters for the design of dust removal by ventilation, taking the 40# belt conveyer drift of the hoisting system in Xishimen Iron Mine as the research background, dust mass concentration in the belt conveyer roadway was simulated using the discrete phase model for computational fluid mechanics, which is based on the theory of gas-solid two-phase flow. By contrast with field measurement of dust mass concentration distribution, the simulating results were essentially coincident with the measured data, indicating that using the Eul- er-Lagrange method to simulate dust mass concentration distribution in the belt conveyer roadway is feasible. In the design of dust re- moval by ventilation, the dust mass concentration can be kept within 3 mg·m^-3 as the wind velocity is 3 m· s^-1. The dust mass concen- tration is lower at the belt conveyer velocity of 2. 5 m· s^-1. In addition, regular wall sprinkling can decrease the dust mass concentra- tion.