Gas–Solid Flow Characteristics of Airflow and Dust Particles in Blasting Excavation of Underground Metal Mine Tunnels

作者：Boxue Pang, Xianghui Ren, Shaoqin Wang, Guangliang Yan, Jiyu Hou, Longhao Li, Li Liang, Xu Liu · 发表于：ACS Omega · 年份：2024 · DOI：10.1021/acsomega.4c00433 · 被引用次数：10 · 研究领域：Cyclone Separators and Fluid Dynamics、Coal Properties and Utilization、Particle Dynamics in Fluid Flows

High Resolution Image Download MS PowerPoint Slide Effective dust removal has long been a challenge in the blasting mining of underground metal mine tunnels, and uncontrolled dust diffusion seriously endangers workers’ respiratory systems and the underground space safety environment. However, the vast majority of existing numerical studies on dust diffusion are focused on coal mine fully mechanized mining, which is different from metal mine blasting excavation in terms of stope structure and dust properties. Furthermore, the mechanism by which the forced and exhaust ventilation modes affect the diffusion characteristics of inhalable particles is unclear. In this work, gas–solid flow characteristics for dust diffusion in a typical metal mine blasting tunnel were numerically investigated based on the Euler–Lagrange method, where the blasting face instantly released 6.37 × 10 7 particles with 100 different sizes, ranging from 0.8 to 200 μm. The interphase forces between airflow and dust particles are comprehensively modeled, and the particle diffusion effect caused by fluid turbulence is described by a discrete random walk model. Detailed information for airflow turbulence and particle migration was revealed, and dust removal efficiencies for inhalable particulate matter (PM10) by forced, exhaust, and hybrid ventilation were analyzed. Numerical results predict a complex airflow pattern in the working roadway, including the jet-flow region, return airflow core region, airflow dis...