Research on multi-radial swirling flow for optimal control of dust dispersion and pollution at a fully mechanized tunnelling face

Hua, Yun; Nie, Wen; Wei, Wenle; Liu, Qiang; Liu, Yanghao; Peng, Huitian

doi:10.1016/j.tust.2018.05.018

Cited by 67 publications

(15 citation statements)

References 23 publications

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“…However, the overlap systems, as shown in Figure 1, combine the advantages of the PF and PE, which provides another alternative to ameliorate adverse thermal environment. Many researchers carried out in situ measurements and numerical simulation studies on the auxiliary ventilation system from the viewpoint of dust and methane control [14,17]. However, few studies on the field of thermal environment are available.…”

Section: Effect Of Auxiliary Ventilation On Thermal Environment Of Aimentioning

confidence: 99%

“…Sasmito et al developed a three-dimensional blind heading model for studying the effects of the ventilation flow rate, cooling load, virgin rock temperature, and the heat rejection from mining machinery [12]. To date, much more researchers have conducted a large number of numerical simulations to investigate the airflow ventilation-methane behavior and airflow ventilation-dust control [14][15][16][17][18] in PF and PE, respectively. Based on these research findings, the constraint conditions for Z m and Z e (the distances between the exhausting outlet and the heading face) in PF and PE can be written as Equations (1) and (2), respectively [19]:…”

Section: Introductionmentioning

confidence: 99%

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In Situ Measurements and CFD Numerical Simulations of Thermal Environment in Blind Headings of Underground Mines

et al. 2019

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In order to gain a knowledge of the heat emitted from a variety of sources at the blind heading of an underground gold mine, the present study conducts an in situ measurement study in a blind heading within the load haul dumps (LHDs) that are operating. The measurements can provide a reliable data basis for the setting of numerical simulations. The results demonstrate that the distances between the forcing outlet and the mining face (denoted as Zm), as well as the heat generation from LHDs (denoted as QL), has brought significant impacts on the airflow velocity, relative humidity, and temperature distributions in the blind heading. Setting Zm to 5 m could achieve a relative optimal cooling performance, also indicating that when the LHD is fully operating in the mining face, employing the pure forcing system has a limited effect on the temperature decrease of the blind heading. According to the numerical simulations, a better cooling performance can be achieved based on the near-forcing-far-exhausting (NFFE) ventilation system.

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Section: Effect Of Auxiliary Ventilation On Thermal Environment Of Aimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Measurements and CFD Numerical Simulations of Thermal Environment in Blind Headings of Underground Mines

et al. 2019

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“…The falling ore particles are discrete phases in the simulation process. The rotation and collision of ore particles in the ore pass can be described by Newton’s second law 35 , 36 …”

Section: Experimental Section and Computational Methodsmentioning

confidence: 99%

Study on Parameters of a New Gas–Water Spray in Ore Pass Dedusting Based on Experiment and Numerical Simulation

Wang

Jiang

et al. 2020

ACS Omega

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To solve the problem of ore unloading dust in ore pass crosscuts, the atomization characteristics of a new gas–water spray and the effect of the ore discharge airflow on the spray effect were studied by experiments, and the installation position of the spray nozzle in the crosscut was determined by numerical simulation. The results show that when the gas–water flow ratio is 100–150, the atomization effect is the best. In this situation, the droplet size can be less than 28 μm. The impact airflow induced by ore unloading has a great influence on the size of the spray droplets, and the dust-collecting ability of the spray is negatively correlated with the impinging airflow. The best location for the spray is 5 m away from the wellhead. At this position, the impact airflow is less than 1.5 m/s, which can ensure that the total dustfall rate of the gas–water spray is 67% and that of the respiratory dust is 34%.

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“…The k-Epsilon turbulence model has a good convergence rate, which is suitable for solving exterior flow problems with complex geometry and has been widely used in numerical simulation related to mine ventilation [ 28 , 29 ]. Due to the complexity of the geometric structure of the human body, the K-Epsilon model is adopted in this paper.…”

Section: Modeling and Simulationmentioning

confidence: 99%

Study on the Oxygen Enrichment Effect of Individual Oxygen-Supply Device in a Tunnel of Plateau Mine

2020

IJERPH

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Complex characteristics of the plateau environment such as low oxygen content seriously restrict the exploitation of abundant mineral resources in plateau areas. To regulate the hypoxia environment and improve the comfort of workers engaged in intense physical labor like tunnel excavation operations in plateau mines, an individual oxygen-supply device for tunnel of plateau mine was proposed to create local oxygen enrichment in the area around the human nose. The Computational Fluid Dynamics (CFD) method was used to judge the application’s effect of the individual oxygen-supply device in plateau mine, revealing the oxygen diffusion law under the influence of different oxygen enrichment factors. The orthogonal design and range analysis were used to measure the degree of influence of major factors such as oxygen-supply velocity, oxygen-supply concentration, and tunnel airflow velocity. The results demonstrate that the oxygen mass fraction of the air inhaled by the human had a positive correlation exponential function, a positive correlation linear function, and a negative correlation exponential function, respectively, concerning oxygen-supply velocity, oxygen-supply concentration, and tunnel airflow velocity. The range analysis revealed that the major influencing factors of oxygen enrichment in the tunnel of the plateau mine were, in a descending sequence, as follows: oxygen-supply concentration, tunnel airflow velocity, and oxygen-supply velocity, and the corresponding ranges were 2.86, 2.63, and 1.83, respectively. The individual oxygen-supply device achieved the best oxygen enrichment effect when the oxygen-supply velocity was 5 m/s, the oxygen-supply concentration was 60%, and the tunnel airflow velocity was 0.2 m/s, which increased the oxygen mass fraction of air inhaled by the human to 30.42%. This study has a positive guiding significance for the improvement of the respiration environment in the tunnel of plateau mine.

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Research on multi-radial swirling flow for optimal control of dust dispersion and pollution at a fully mechanized tunnelling face

Cited by 67 publications

References 23 publications

In Situ Measurements and CFD Numerical Simulations of Thermal Environment in Blind Headings of Underground Mines

In Situ Measurements and CFD Numerical Simulations of Thermal Environment in Blind Headings of Underground Mines

Study on Parameters of a New Gas–Water Spray in Ore Pass Dedusting Based on Experiment and Numerical Simulation

Study on the Oxygen Enrichment Effect of Individual Oxygen-Supply Device in a Tunnel of Plateau Mine

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