采场爆破烟尘浓度分布及扩散规律的数值模拟

Numerical simulation of blasting dust concentration distribution and diffusion regularities in stope

针对采场爆破作业过程中烟尘浓度高且不易排出的特点,采用现场实测的方法对烟尘浓度进行实际测定,并依据气固两相流理论,运用计算流体力学的Fluent软件对采场爆破烟尘浓度分布及扩散进行数值模拟,通过对比分析,模拟结果与实测数据基本保持一致,极好地验证并完善了现场研究理论。通过研究发现:采场进路内有风流漩涡存在,在断面方向,烟尘浓度以断面中心为圆心径向逐步降低;在轴线方向,烟尘浓度随距工作面距离的增加逐步降低;随着时间的推移,烟尘浓度先迅速上升至最大值,后缓慢降低;联络巷风速为2 m/s时采场内烟尘排出效果达到最佳;此外,还可通过安装局部通风设施加强烟尘的排出效果。

According to the dust characteristics of high concentration and difficult to discharge during the process of stope blasting operation,authors introduced the method of field measurement of dust concentration for actual determination.Based on gas-solid two-phase flow theory,authors carried out the numerical simulation of stope blasting dust concentration distribution and diffusion by computational fluid dynamics software Fluent.The measured data agreed well with the simulation results,validated and refined the theory of field studies.The study found there exist romantic whirlpool in the stope approach roads;in the section direction,the dust concentration is gradually radially reduced in the cross-section center as center of the circle;in the axial direction,the smoke concentration is gradually reduced with the distance increment from the working face;the dust concentration rised to maximum in the first place rapidly,and then decreased slowly over time;stope dust discharge effect achieved best with wind speed is 2 m/s in contact lane.In addition,the smoke discharged effect can also be strengthen by the installation of local ventilation facility.