露天矿钻孔扬尘控制方案的数值模拟及其优化

发布时间：2018-02-12 18:31

本文关键词： 潜孔钻粉尘浓度数值模拟除尘效率　出处：《辽宁工程技术大学》2014年硕士论文　论文类型：学位论文

【摘要】：为了掌握露天矿潜孔钻机产尘空间浓度的分布规律,获取钻孔扬尘控制方案的合理参数,以安家岭露天煤矿为研究背景,依据流体力学的理论基础,采用气固两相流的离散相模型(DPM模型),对露天矿潜孔钻机产尘的粉尘浓度进行数值模拟,并用旋风-脉冲滤袋二级除尘系统对钻孔产尘的沉降进行数值模拟,并对现场降尘前实测的粉尘浓度分布情况及降尘后实测的粉尘浓度分布情况进行对比分析,实验结果明显达到了钻孔扬尘控制方案的优化。研究结果显示：钻孔扬尘的粉尘浓度较大且呈自由扩散状态分布,对钻机及其周围环境造成严重污染和危害；在旋风-脉冲滤袋二级除尘系统的数值模拟中捕捉壁面条件下粉尘浓度较之反弹壁面要低；利用旋风-脉冲滤袋二级除尘系统对潜孔钻的除尘率达到99%以上。
[Abstract]:In order to master the distribution law of dust production space concentration of downhole drilling rig in opencast mine and to obtain the reasonable parameters of the control scheme of raising dust in borehole, taking Anjialing opencast coal mine as the research background, according to the theory foundation of hydrodynamics, Using the discrete phase model of gas-solid two-phase flow and DPM model, the dust concentration of downhole drilling rig in opencast mine is numerically simulated, and the settling of borehole dust is simulated with the two-stage dust collection system of whirlwind pulse filter bag. The distribution of dust concentration before and after dust fall is compared and analyzed. The experimental results show that the dust concentration of the borehole dust is large and distributed in the state of free diffusion, which causes serious pollution and harm to the drilling rig and its surrounding environment. In the numerical simulation of the two-stage dust removal system of cyclone-pulse filter bag, the dust concentration is lower than that of the rebound wall under the condition of capturing the wall, and the dust removal rate of the downhole drill is more than 99% by using the two-stage cyclone pulse filter bag dust removal system.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TD714.4

【参考文献】