Dispersion characteristics of dust pollutant in a typical coal roadway under an auxiliary ventilation system

Geng, Fan; Gui, Changgeng; Teng, Haixu; Tang, Junhua; Niu, Hongwei; Zhou, Fang; Liu, Chun; Hu, Shuda; Li, Shihang

doi:10.1016/j.jclepro.2020.122889

Cited by 36 publications

(10 citation statements)

References 44 publications

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“…All dust particles are released from the blasting face with a total generation rate of 8 × 10 –3 kg/s, and the initial injection velocity is set to 10 m/s. According to the setting, the dust particles will complete the injection within 1 s. Diameters of the dust particles follow a Rosin–Rammler distribution, with a maximum diameter of 2 × 10 –4 m, a minimum diameter of 8 × 10 –7 m, and a mean diameter of 7 × 10 –5 m, which is a typical particle size range for dust in deep metal mining. , As a result, 6.37 × 10 7 dust particles with 100 different sizes are generated. The exit of the tunnel is set as an atmospheric pressure outlet boundary condition for airflow and escape boundary conditions for particles.…”

Section: Computational Fluid Dynamics Model For Airflow and Dust Part...mentioning

confidence: 99%

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

Pang,

Ren,

Wang

et al. 2024

ACS Omega

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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 disorder region, and secondary flow region. Dust diffusion temporal characteristics can be divided into three stages, namely, the initial stage of dust generation, the efficient ventilation and dust removal stage, and the later stage of dust diffusion. Dust diffusion spatial characteristics indicate that under the Coanda wall attachment effect, the dust concentration exhibits nonuniform distribution in both vertical and horizontal directions of the return air roadway. The dust removal efficiency of hybrid ventilation on inhalable particles above respiratory height is better than that of forced ventilation, especially in the return air roadway. The additional exhaust air duct based on forced ventilation can discharge more inhalable particles from the tunnel.

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Section: Computational Fluid Dynamics Model For Airflow and Dust Part...mentioning

confidence: 99%

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

Pang,

Ren,

Wang

et al. 2024

ACS Omega

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“…In the light of the solid phase with a large amount of dust, the Euler method was first applied for the coupled flow, taking into account such things as the dust particles, the airflow and the coupling between them. The Euler method can be seen in the previous studies (Geng et al, 2020;Wang et al, 2019) and relative information of ANSYS. In addition, the detailed information can be seen in Table 1.…”

Section: Wherementioning

confidence: 99%

“…It makes it more complex to study the health outcomes, like the etiology, the pathogenesis and the disease progression (Zazouli et al, 2020;Laney et al, 2012). A better understanding on dust properties and concentrations is clearly important for dust exposure assessment and its linking to health outcomes (Johann-Essex et al, 2017;Geng et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Suspension characteristics of the coal-quartz dust mixture in the working environment during the fully mechanized mining process

Geng,

An,

Wang

et al. 2023

Environ Sci Pollut Res

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Dust exposures during mining activity can result in lung diseases such as Coal workers' pneumoconiosis (CWP) and silicosis, which are closely related to quartz dust. In the present study, coal-quartz dust mixture were investigated considering the particle size and the specific constituents. Multiple numerical techniques, including Computational Fluid Dynamics and Discrete Element Method (CFD-DEM), hard sphere model and direct monte carlo simulation (DSMC) were presented, and the dust diffusion process was investigated. According to the validation of the numerical model, the suspension characteristics of the polydisperse mixed dust were analyzed in detail. The results show that PM10 responds quickly with good following performance with the air flow. The particle size increases gradually from top to bottom.When the air velocity is low, the percentage of coal dust in the breathing zone tends to be 50%. The results provide theoretical guidance for the comprehensive prevention of the mixed dust in underground coal mines.

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“…Cheng, L. [29,30] analyzed the propagation characteristics of coal dust explosions in a large experimental roadway induced by a gas explosion and showed that the peak overpressure statistics increased and then decreased with increasing distance from the explosion source. Geng, F. [31] investigated the dispersion characteristics of dust contaminants in a typical coal tunnel under an auxiliary ventilation system and showed that the dust suspended in the air was mainly particles < 20 µm. Saurabh, K. et al [32,33] developed an intelligent dry mist dust removal system that reduced dust concentrations in the work area from the prevailing 0.62-1.73 mg/m 3 to 0.10-0.17 mg/m 3 .…”

Section: Introductionmentioning

confidence: 99%

Research on the Physical and Chemical Characteristics of Dust in Open Pit Coal Mine Crushing Stations and Closed Dust Reduction Methods

Liu

Zhou

et al. 2023

Sustainability

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As an important link in open-pit mining production, the crushing station produces a large amount of dust during the production process. Dust has the characteristics of a wide spread area, great harm, and difficult governance. Therefore, dust control has become a key issue that needs to be solved in open-pit mining. In this article, we assess results after high-speed cameras and dust concentration detectors are installed around the crushing station to monitor the dust concentration in the surrounding air. It is found that in the air, dust with a particle size of less than 2.5 μm accounts for 67.43%, less than 10 μm accounts for 17.30%, and less than 100 μm accounts for 15.27%. In settled dust on the ground, particles with a particle size of less than 100 μm account for 42.69% of the sample, and particles less than 10 μm account for 16.60% of the sample. Secondly, physical and chemical properties testing is conducted on the dust. XRD test results show that SiO2 in the dust accounts for 65.80%; XRF test results show that the oxide Al2O3 in the dust accounts for up to 46.84%; ICP test results show that the element Al accounts for 42.62% of the total amount of trace elements detected; and Si accounts for 35.11%, clarifying the content of harmful substances to the human body. Finally, Fluent software, Ansys 2020 R1, is used to simulate the diffusion law of dust under different states of the crushing station, including an open state, a closed state, and the installation of a dust removal system. Based on the simulation results and the actual situation on site, the optimal dust reduction method suitable for the crushing station is proposed, and the diffusion law of dust under this method is simulated. The tracked dust shows that the dust removal efficiency of PM2.5 reaches 97.00%, PM10 reaches 99.60%, and TSP reaches 98.30%.

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Dispersion characteristics of dust pollutant in a typical coal roadway under an auxiliary ventilation system

Cited by 36 publications

References 44 publications

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

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

Suspension characteristics of the coal-quartz dust mixture in the working environment during the fully mechanized mining process

Research on the Physical and Chemical Characteristics of Dust in Open Pit Coal Mine Crushing Stations and Closed Dust Reduction Methods

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