Characterization of 10 nm-10 μm coal dust particles generated by simulated different cutting and drilling parameters:mass concentration distribution,number concentration distribution,and fractal dimension
Jintuo Zhu
Menglin Chen
Liang Wang
Haisong Sun
Chenghao Wang
Noor Azhar
Nkansah Benjamin Oduro
Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology),Ministry of Education,221116 Xuzhou,Jiangsu,China;National Professional Laboratory for Fundamental Research of Mine Gas and Dust Control Technology,School of Safety Engineering,China University of Mining and Technology,221116 Xuzhou,Jiangsu,China;School of Safety Engineering,China University of Mining and Technology,221116 Xuzhou,Jiangsu,China
摘要：Nano-to-micron-sized coal dust can cause coal workers'pneumoconiosis(CWP),and cutting and drilling are the main coal dust-generating processes.Based on a self-developed simulated coal cutting and drilling dust generation system,the effects of cutting parameters(tooth tip cone angle,impact angle,roller rotary speed,cutting speed)and drilling parameters(drill bit diameter,drilling speed)on the mass concentration distribution,number concentration distribution and fractal dimension of 10 nm-10 μm coal dust were investigated.Results show that the mass concentration of 10 nm-10 μm coal dust generated by cutting/drilling peak at 5.7-7.2 μm,while the number concentrations during cutting and drilling respec-tively peak at 60-90 nm and 20-30 nm.During both cutting and drilling processes,the generated coal dust particles in 10-300 nm account for＞90％of the total 10 nm-10 μm coal particles,while PM2.5 in PM10 is generally below 18％.It is also found that smaller tooth tip cone angle,larger impact angle,lower roller rotary speed,smaller drill bit diameter,or lower drilling speed can reduce the generation of 10 nm-10 μm coal dust with a fractal dimension of 0.94-1.92.This study reveals the distribution characteristics of nano-to micron-sized coal dust particles under different cutting and drilling parameters,and the research results can serve as reference for adjusting cutting and drilling parameters to lower down the 10 nm-10 μm coal dust generation and thus prevent the CWP.
机标关键词：distributiondifferentdimensioncuttingfractaldustmasscharacter
论文发表日期：2023-12-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：15( 160-174 )
英文信息