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Study on temporal and spatial evolution law for dust pollution in double roadway ventilation system of short wall continuous mining face

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Abstract

To explore the laws of variations in the evolution of dust pollution within a double tunnel ventilation system at a short wall continuous mining face, a numerical simulation of air flow movement was conducted in this study. Results showed that after the wind flowing in the supporting and heading tunnels reached the head, the wind sides returned at speeds of 6.5 and 10.3 m/s, respectively. Affected by the air volume and pressure differences between the two tunnels, part of the air flow entered the connecting tunnel at an average speed of 0.8 m/s and moved to the heading tunnel. Affected by the turbulence at the driving face, a high dust concentration zone with a maximum dust concentration of 1700 mg/m3 was formed in the tunnels at a distance of 15 m from the heading. Dust blocked by the shuttle car accumulated and settled near it and formed a dust zone with an approximate average concentration of 750 mg/m3 at a distance of 19–23 m from the heading. The dust produced by the bolt machine formed a dust mass with an average concentration of 900 mg/m3 at a distance of 0.5–4.5 m from the head. Quantitative analyses of the changes in dust concentration with time at the position of a driver of the continuous mining machine, shuttle car, and anchor bolt machine were conducted, and functional formulae for the quadratic distribution were obtained. Suggestions for dust control were then proposed.

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Abbreviations

\(\rho\) :

Air density (kg/m3)

\({x}_{i}\) :

Index sign of the tensor in the direction of each coordinate (/)

\({u}_{i}\) :

Velocity vector of air flow field in the direction of each coordinate (m/s)

\(t\) :

Time (s)

\({G}_{k}\) :

Generation term for turbulent kinetic energy caused by mean velocity gradient (kg/(s3·m))

\(k\) :

Turbulent kinetic energy of the air flow field (m2/s2)

\(\varepsilon\) :

Energy dissipation rate of the turbulent flow in a wind field (m2/s2)

\(\mu\) :

Viscosity coefficient of the laminar flow (Pa·S)

\({\mu }_{t}\) :

Viscosity coefficient of turbulence (Pa·S)

C1ε, C2ε C3ε, Cμ :

Constants, C1ε = 1.44, C2ε = 1.92, Cμ = 0.09; C3ε = 1 (C3ε = 0) when the fluid is compressible and the main flow direction is parallel (perpendicular) to the direction of gravity (/)

σk, σε :

Constants, σk = 1.0, σε = 1.3 (/)

\({m}_{p}\) :

Quality of dust particles (mg)

\({u}_{p}\) :

Transport velocity of dust particles (ms)

\(\sum F\) :

Sum of the forces acting on the dust particles (N)

\({F}_{d}\) :

Resistance of the dust particles (N)

\({F}_{g}\) :

Gravity of the dust particles (N)

\({F}_{f}\) :

Buoyancy of the dust particles (N)

\({F}_{x}\) :

Other forces acting on the dust particles (N)

\({C}_{d}\) :

Resistance coefficient (/)

 a1 a2 a3 Constant (/)

\({C}_{\varphi }\)  :

Dynamic shape factor (/)

\({A}_{p}\) :

Windward area of the particles (m2)

\({Re}_{p}\) :

Reynolds number (/)

\({d}_{p}\) :

Particle diameter (m)

\(\zeta\) :

Random number obeying normal distribution (/)

\(\sqrt{{{\overline{u}}^{^{\prime}}}^{2}}\) :

Root mean square of the fluctuating velocity (m/s)

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Funding

This work was financially supported by the National Natural Science Foundation of China (Grant no. 51774198, 51904171, 52004150), the Qingchuang Science and Technology Project of Universities in Shandong Province, China (Grant no. 2019KJH005) and the Science and Technology Project of Qingdao City (Grant no. 20–3-4–2-nsh).

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Authors and Affiliations

  1. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, People’s Republic of China

    Gang Zhou, Yang Yang, Bin Jing, Biao Sun & Zhen Liu

  2. State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, 266590, Qingdao, People’s Republic of China

    Gang Zhou, Yang Yang, Bin Jing, Biao Sun & Zhen Liu

  3. College of Safety Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, People’s Republic of China

    Shengyong Hu

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  1. Gang Zhou
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  2. Yang Yang
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  3. Bin Jing
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  4. Biao Sun
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Contributions

All authors contributed to the study conception and design. Gang Zhou: supervision, project administration, funding acquisition. Yang Yang: conceptualization, writing—original draft, writing—review and editing. Bin Jing: data curation. Biao Sun: investigation, formal analysis, experiment. Shengyong Hu: experiment. Zhen Liu: methodology. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Biao Sun.

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All analyses are based on previously published research. The research does not involve ethical and moral issues, so no moral approval is required.

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We would like to submit the enclosed manuscript entitled “Study on temporal and spatial evolution law for dust pollution in double roadway ventilation system of short wall continuous mining face”, which we wish to be considered for publication in “Environmental science and pollution research”. I would like to declare on behalf of my co-authors that the work described was original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part.

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The authors declare no competing interests.

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Zhou, G., Yang, Y., Jing, B. et al. Study on temporal and spatial evolution law for dust pollution in double roadway ventilation system of short wall continuous mining face. Environ Sci Pollut Res 29, 34419–34436 (2022). https://doi.org/10.1007/s11356-021-18438-7

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