Numerical simulation investigation on optimal dust-exhausting airflow volume in fully mechanized caving face of high-gas coal mine

Song, Shuzheng; Zhou, Gang; Duan, Jinjie; Zhang, Lichao; Gao, Danhong; Sun, Biao

doi:10.1016/j.psep.2020.11.045

Cited by 47 publications

(5 citation statements)

References 39 publications

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“…Du et al established an idealized rectangular coal mining face model with a mining height of up to 8.8 m and simulated the airflow and dust transport behavior within the supersized fully mechanized mining face . Song et al constructed a fully mechanized top coal caving face model with full negative pressure-independent ventilation in a U-shaped working tunnel and simulated the two-phase diffusion of gas and inhalable dust particles . Gui et al established a rectangular coal roadway model with an arch, focusing on the control effect of PM2.5 around the tunneling machine driver under the wind curtain-assisted ventilation system .…”

Section: Introductionmentioning

confidence: 99%

“… 19 Song et al constructed a fully mechanized top coal caving face model with full negative pressure-independent ventilation in a U-shaped working tunnel and simulated the two-phase diffusion of gas and inhalable dust particles. 20 Gui et al established a rectangular coal roadway model with an arch, focusing on the control effect of PM2.5 around the tunneling machine driver under the wind curtain-assisted ventilation system. 21 Liu et al established a tunnel boring machine (TBM) tunneling model with a circular cross section for subway tunnels, analyzed the dust transport under the opening and closing states of the main ventilation system, and summarized the principles of dust control in tunneling.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Coal is a primary source of energy and plays an essential role in industrial production ( Chen et al., 2022 ; Song et al., 2021 ); however, the dangerous nature of coal mining, which has resulted in many casualties, has long been a problem that needs to be addressed ( Yin et al., 2017 ). A fully mechanized heading face is the main dust source, accounting for about 60% of the total amount of coal dust generated in mines ( Zhang et al., 2022 ).…”

Section: Introductionmentioning

confidence: 99%

A method of regulating the wind field to reduce safety hazards of gas and dust in fully mechanized heading face based on dynamic data

Liu¹,

Gong²,

Chen³

et al. 2022

Heliyon

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“…The preparation of epoxy resin self-healing microcapsules is of substantial application value for repairing the microcracks of cement-based materials. − Many studies have been conducted on urea–formaldehyde/epoxy microcapsules, melamine/epoxy microcapsules, and phenolic/epoxy microcapsules, among others. − These microcapsules are of fracture-release type, and, inevitably, formaldehyde is used as a raw material in the production of the wall material. Formaldehyde is easily released during use and causes substantial damage to the human body, which limits the wide application of self-healing microcapsules. − Moreover, the fracture release of the microcapsules must reach a mechanical trigger point to promote the rupture of the microcapsules, and their repair performance and stability are not ideal.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a Multifunctional Sustained-Release Organic–Inorganic Hybrid Microcapsule with Self-Healing and Flame-Retardancy Properties

Jiang

Zhou

Duan

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

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As their service life increases, cement-based materials inevitably undergo microcracking and local damage. In response to this problem, this study used phacoemulsification-solvent volatilization to prepare a multifunctional sustained-release microcapsule (SFRM) with selfhealing and flame-retardant characteristics. The synthesis of SFRM is based on the modification of ethyl cellulose with nano-SiO 2 particles and crosslinking with a silane coupling agent to form an organic−inorganic hybrid wall material. The epoxy resin is blended with hexaphenoxy cyclotriphosphazene (HPCTP) to form a composite core emulsion. The surface morphology, particle size distribution, core−shell composition, and thermal stability of SFRM were analyzed via scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), Malvern, Fourier-transform infrared (FT-IR), and TD-DSC-DTG. It is concluded that SFRM was successfully synthesized with superior particle size distribution and thermal stability. When the ratio of SiO 2 solution and EC alcohol solution reached 1:2, the particle size distribution of the microcapsules was 30−190 μm, and the D 50 decreased to 70 μm. The core material content, slow-release performance, and flame retardancy of SFRM were measured using a UV-1800 spectrophotometer and Hartmann tubes, and the compressive and repair properties of SFRM were evaluated by uniaxial compression tests. The results demonstrate that SFRM has satisfactory slow-release and flame-retardancy properties, the LC is 67%, and the first-order kinetic model shows the best fit and conforms to the non-Fickian diffusion mechanism. The SFRM repair rate can reach approximately 61%. This is of substantial significance to the field of self-repairing cement-based materials.

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Numerical simulation investigation on optimal dust-exhausting airflow volume in fully mechanized caving face of high-gas coal mine

Cited by 47 publications

References 39 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

A method of regulating the wind field to reduce safety hazards of gas and dust in fully mechanized heading face based on dynamic data

Synthesis and Characterization of a Multifunctional Sustained-Release Organic–Inorganic Hybrid Microcapsule with Self-Healing and Flame-Retardancy Properties

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