CFD comparative analysis on the pollution characteristics of coal dust under turbulent airflow from coal cutting in the fully mechanized mining face

Zhang, Guobao; Sun, Biao; Song, Shuzheng; Wang, Hao; Zhou, Gang

doi:10.1016/j.psep.2020.11.044

Cited by 28 publications

(6 citation statements)

References 33 publications

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“…The respiratory dust concentration in the return airway is high, and ordinary mining nozzles have poor atomization effects with large droplet particle sizes and uneven dispersion, resulting in poor dust reduction and the inability of the droplet particle sizes to influence respiratory dust [ 35 , 36 ]. To solve the above problems and to propose reasonable measures, including conduction simulation and calculation of the dust transport law of the return tunnel [ 37 ], the use of supersonic spray dust reduction technology is proposed in order to meet the requirements of tunnel resistance and to influence of the tunnel wind flow, efficient capture and dust reduction of small particle size dust [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

Study on dust control technology of mobile spray combined with full-section fog curtain in return airway of header working face

et al. 2022

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For the problem of coal dust pollution in the return air lane of the comprehensive mining working face of soft rock mines.Based on the principle of supersonic siphon pneumatic atomization dust control, mobile vehicle-mounted pneumatic spraying combined with full-section fog curtain dust control technology is proposed to address the coal dust pollution problem in the return air tunnel of the comprehensive mining working face of soft rock mines. This technology has a wider spraying range, stronger wind resistance and lower energy consumption.Using the k-ε turbulence module and the fluid flow particle tracking module of COMSOL simulation software, a three-dimensional numerical model of the return air tunnel was established. The effect of wind flow characteristics on the diffusion range of coal dust and fog droplets was analysed, and the dust transport pattern and dust control effect of the new technology were obtained for different cross-sectional return airways. The results show that the velocity of the wind flow is continuously decayed by the slope, and the dust of different particle sizes is distributed differently by the inertial force. Coal dust with particle sizes larger than 6.5 μm accumulates below the structure at a lower velocity, and coal dust with particle sizes smaller than 4.5 μm is mostly suspended above the structure at a higher velocity. The device effectively stops the transport of dust and covers the whole section of the roadway, and the dust removal efficiency reaches 96.53%~97.93%, which provides relevant theoretical support and treatment means for the control of dust pollution in the return airway of coal mines.

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Section: Introductionmentioning

confidence: 99%

Study on dust control technology of mobile spray combined with full-section fog curtain in return airway of header working face

et al. 2022

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“…In addition to bringing occupational diseases such as pneumoconiosis to workers, dust pollution also increases the likelihood of underground explosions [ 4 – 6 ]. More than 90% of existing coal mines in China are underground, and coal dust is mainly generated from drum cutting and propulsion during mine coal mining [ 7 , 8 ], and underground coal transfer and retransfer transport is one of the main factors of underground coal dust pollution [ 9 , 10 ]. Since the 1950s, many researchers [ 11 , 12 ] have systematically investigated the dust diffusion law with wind [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…Coal dust is a serious health hazard to workers, dust not only causes damage to mechanical equipment used in mining coal mines, but also reduces the quality of the environment and the visible range of workers, while leading to pneumoconiosis, a serious occupational disease [1][2][3]. In addition to bringing occupational diseases such as pneumoconiosis to workers, dust pollution also increases the likelihood of underground explosions [4][5][6]. More than 90% of existing coal mines in China are underground, and coal dust is mainly generated from drum cutting and propulsion during mine coal mining [7,8], and underground coal transfer and retransfer transport is one of the main factors of underground coal dust pollution [9,10].…”

Section: Introductionmentioning

confidence: 99%

Study on coal dust diffusion law and new pneumatic spiral spray dedusting technology at transfer point of mine cross roadway

et al. 2022

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In order to solve the problem of coal dust pollution at the transfer point, a three-dimensional numerical model of wind flow-coal dust at the loading point of underground rubber run was established by computational fluid dynamics (CFD) discrete particle model and finite element method and k-ε turbulence model, and the coal dust diffusion pollution phenomenon caused by the coal flow transfer under the intersection of wind flow in the cross tunnel was studied. Based on the simulation results of wind flow velocity contour, pressure contour and isochronous flow vector distribution, the influence mechanism of wind flow and coal dust characteristics on the distribution of wind flow and coal dust diffusion in the roadway is analysed, and a dust control and reduction system and treatment scheme with new pneumatic screw spray technology as the core is proposed to suppress coal dust pollution at the reloading point. The results of the study show that the wind flow distribution is mainly influenced by the intersection of tape traction and cross-roadway wind flow, showing a complex multi-layer distribution along the roadway and in the normal direction; the diffusion of coal dust of different particle sizes is influenced by the roadway wind flow, and coal dust with particle sizes in the range of 10μm~20μm is more easily diffused, and the dust with particle sizes in the range of 20μm~45μm is mainly collected and suspended near the vortex wind flow at the cross-roadway. The coal dust in the range of 20 μm~45 μm is more likely to gather in the vortex; the treatment system effectively controls the coal dust inside the dust cover, and the spiral-shaped transported droplet particle group formed by the pneumatic spiral spray combines with it efficiently, which verifies the dust control and reduction effect of the pneumatic spiral spray system at the transfer point, and the dust removal efficiency reaches 89.35%~93.06%, which provides relevant theoretical support for the treatment of dust pollution at the coal transfer point in underground coal mines It provides the theoretical support and means to control dust pollution at underground coal transfer points.

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“…The presence of dust in mine workings poses a great threat to the health of workers, both physical and psychological, as well as to the environment. Additionally, high concentrations of dust are the cause of very dangerous dust explosions [5][6][7][8]. Thus, it can be assumed that dustiness, which cannot be eliminated in the mining production process, is a very unfavorable phenomenon both to the health and life of the crew and the efficiency of the mining process.…”

Section: Introductionmentioning

confidence: 99%

CFD Model Studies of Dust Dispersion in Driven Dog Headings

et al. 2022

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Dust is one of the most burdensome hazards found in the environment. It is composed of crushed solids that pose a threat to the health and life of people, machines and machine components. At high concentration levels, it can reduce visibility. All of these negative phenomena occur during the process of underground mining, where dust hazards are common. The negative impact of dust on the efficacy of the mining process prompts research in this area. The following study presents a method developed for model studies of dust dispersion in driven dog headings. This issue is immensely important due to the fact that these dog headings belong to a group of unidirectional excavations (including tunnelling). This paper presents the results of model studies on dust dispersion in driven dog headings. The main focus is on the analysis of the distribution of dust concentration along a dog heading during the mining process. In order to achieve this goal, a model test method based on the finite volume method, which is included in the group of CFD methods, was developed. Analyses were carried out for two different values of dust emission from the face of the excavation for the transient state. The results made it possible to determine areas with the highest potential for dust concentration. The size and location of these areas are mainly dependent on the amount of dust emissions during the mining process. The results can support the process of managing dust prevention and protection of workers during the mining excavation process.

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CFD comparative analysis on the pollution characteristics of coal dust under turbulent airflow from coal cutting in the fully mechanized mining face

Cited by 28 publications

References 33 publications

Study on dust control technology of mobile spray combined with full-section fog curtain in return airway of header working face

Study on dust control technology of mobile spray combined with full-section fog curtain in return airway of header working face

Study on coal dust diffusion law and new pneumatic spiral spray dedusting technology at transfer point of mine cross roadway

CFD Model Studies of Dust Dispersion in Driven Dog Headings

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