摘要
潜孔钻机是露天矿使用率最高的钻机,其钻孔扬尘是露天矿主要尘源之一,也是粉尘治理的难点。为获得钻孔扬尘最佳控制方案,以平朔安家岭露天矿为例,采用现场实测和数值模拟相结合的手段,依据气固两相流理论,运用Eulerian模型和DPM模型,对潜孔钻机粉尘扩散规律和除尘效率进行研究。同时基于粒子追踪技术,通过对比旋风一级除尘方案,对旋风-脉冲滤袋二级除尘方案进行量化研究。通过对比分析发现,在等风量条件下,二级除尘系统全尘脱除效率要高于一级除尘系统47%,呼吸性粉尘的脱除效率要高于一级除尘系统56%,与现场实测数据相一致。结果表明,治理现场采取二级除尘系统后,全尘和呼吸性粉尘脱除率分别达到99.7%和94.7%,粉尘浓度值低于国家标准规定的上限值。
The down-to-hole（ DTH） drill is the most frequently utilized drill in open-pit mines,where drilling dust is one of the main dust sources. The Pingshuo Anjialing Open-pit Mine,an area where dust pollution is very serious,was chosen as the experimental spot. In order to obtain the optimal drilling-dust-removal scheme,numerical simulation was combined with field measurements. Eulerian and DPM methods were used for developing a gas-solid two-phase flow model to study the drilling-dust-diffusion rule and dust-removal efficiency. Based on particle tracking technology,a cyclonic bag,two-stage dust removal mechanism was quantitatively analyzed by comparison with a cyclonic one-stage dust-removal system. The results show that the total drilling-dust-removal efficiency was up to 99. 7% and that the respirable-dust-removal efficiency was up to 94. 7%,after the two-stage dust removal scheme was applied. The total dust-removal efficiency of the two-stage dust-removal scheme increased by 47%,and the respirable-dust-removal efficiency increased by 56%,compared to the one-stage dustremoval system. Ultimately,the dust concentration met the national standard.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第2期811-817,共7页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51274116)
关键词
潜孔钻机
粉尘浓度
粒子追踪
数值模拟
二级除尘系统
down-to-hole drill
dust concentration
particle tracking
numerical simulation
two-stage dust removal system
