综掘工作面粉尘扩散与不同粒径粉尘的沉降规律研究  

Research on dust diffusion and settlement law of different particle size in fully mechanized excavation face

作　　者：魏伟 WEI Wei(CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《矿业安全与环保》2021年第5期38-42,共5页Mining Safety & Environmental Protection

基　　金：国家重点研发计划项目(2017YFC0805200);中煤科工集团重庆研究院有限公司重点研发项目(2020ZDXM04)。

摘　　要：采用理论分析、数值模拟和现场测试等方法,通过建立的煤矿综掘工作面三维数值模型,数值模拟研究了综掘工作面粉尘运移及沿程分布规律,基于滤膜计重法现场测试了综掘工作面的粉尘质量浓度,并从粉尘粒径的角度出发,对现场采集的滤膜粉尘进行了粒度分析。研究结果表明:综掘工作面粉尘主要集中在距工作面端头5 m的区域内,粉尘在风流作用下主要沿回风侧煤壁和掘进机机身之间、掘进机机身与巷道顶板之间向端头后方运移;可将综掘工作面粉尘的沿程沉降划分为急速沉降区、中速沉降区和慢速沉降区;粒径大于50μm的粉尘易在掘进机司机前方沉降;粉尘沉降过程中的"拐点粒径"为40μm,小于"拐点粒径"的粉尘在巷道中不易沉降。Based on theoretical analysis,numerical simulation and field test,the dust migration and distribution law along the roadway of fully mechanized excavation face are studied through the three-dimensional numerical model.Based on the filter membrane weight method,the dust mass concentration of fully mechanized excavation face was measured,and the particle size analysis of filter dust collected on site was carried out from the point of view of dust particle size.The results show that the dust of fully mechanized excavation face is mainly concentrated in the range of 5 m away from the heading face,and under the action of air flow,the dust mainly migrates to the rear along two paths:one is between the coal wall of return air side and the body of roadheader,the other is between the body of roadheader and the roof of roadway;the dust settlement along the fully mechanized excavation face can be divided into rapid settlement area,medium speed settlement area and slow settlement area;the dust with a particle size greater than 50μm is easy to settle in front of the roadheader driver;the"inflection point particle size"during the dust settling process is 40μm,and the dust smaller than the"inflection point particle size"is not easy to settle in the roadway.

关 键 词：综掘工作面 粉尘质量浓度 粉尘粒度 沉降规律 数值模拟 

分 类 号：TD714[矿业工程—矿井通风与安全]