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

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS
Jintuo Zhu, Menglin Chen, Liang Wang, Haisong Sun, Chenghao Wang, Noor Azhar, Nkansah Benjamin Oduro
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Abstract

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 respectively 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.

Abstract Image

模拟不同切割和钻孔参数生成的 10 nm - 10 μm 煤尘颗粒的特征:质量浓度分布、数量浓度分布和分形维度
纳米到微米级的煤尘可导致煤工尘肺(CWP),而切割和钻孔是产生煤尘的主要工序。基于自主研发的模拟煤炭切割和钻孔粉尘产生系统,研究了切割参数(齿尖锥角、冲击角、滚筒转速、切割速度)和钻孔参数(钻头直径、钻孔速度)对 10 nm - 10 μm 煤尘的质量浓度分布、数量浓度分布和分形维度的影响。结果表明,切割/钻孔产生的 10 nm - 10 μm 煤尘的质量浓度在 5.7 - 7.2 μm 处达到峰值,而切割和钻孔过程中的数量浓度分别在 60 - 90 nm 和 20 - 30 nm 处达到峰值。在切割和钻孔过程中,产生的 10 - 300 nm 煤尘颗粒占 10 nm - 10 μm 煤尘颗粒总量的 90%,而 PM10 中的 PM2.5 一般低于 18%。研究还发现,较小的齿尖锥角、较大的冲击角、较低的滚筒转速、较小的钻头直径或较低的钻进速度可减少分形维数为 0.94 - 1.92 的 10 nm - 10 μm 煤尘的产生。本研究揭示了不同钻孔参数下纳米级至微米级煤尘颗粒的分布特征,其研究成果可作为调整钻孔参数以降低 10 nm - 10 μm 煤尘产生量从而防止 CWP 的参考。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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