Numerical simulation of the dimensional transformation of atomization in a supersonic aerodynamic atomization dust-removing nozzle based on transonic speed compressible flow

Zhang, Tian; Ge, Shaocheng; Wang, Jiren; Meng, Xiangxi; Ren, Shuaishuai

doi:10.1007/s40789-020-00314-3

Cited by 23 publications

(12 citation statements)

References 22 publications

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“…Many researchers use comsol software for scientific research, and the simulation software is better able to perform numerical simulations with coupled multi-physical fields and the simulation results are highly reliable [ 17 – 19 ]. Comsol was used to simulate and calculate the airflow field, wind speed and particle trajectory of the multilayer spiral spray to explain the influence of this method on the airflow and water mist flow direction and to provide a guaranteed and reliable basis for subsequent test.…”

Section: Physical Model Establishmentmentioning

confidence: 99%

Research on the mechanism of multilayer spiral fog screen dust removal at the comprehensive excavation face

Jing

et al. 2022

PLoS ONE

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To solve the problem of the inability of traditional spray dust removal technology to efficiently restrain dust diffusion at the heading face, a multilayer spiral fog curtain dust control method based on spirally arranged pneumatic nozzles is proposed. In this paper, the k-ɛ turbulence model and K-H droplet breakage model are used. First, different airflow fields are analyzed by simulating the simultaneous injection of different numbers of nozzles, and the motion law of airflow interaction is obtained. Taking the two-layer fog curtain as an example, a multiphysical field coupling numerical simulation of the two-layer spiral fog curtain applied in the field is carried out, and the variation law of its velocity field distribution and particle motion characteristics is analyzed. A similar experimental platform is established to verify the effectiveness of the simulation results and the feasibility of the dust removal scheme. The simulation results show that the double helix arrangement will form a rotating airflow with the cutting arm as the axis to cover the whole roadway section and produce a double-layer spiral fog curtain. The water mist is fragmented into smaller fog droplets under the action of rotating airflow, which improves the dust catching effect of the fog curtain. Experiments show that the dust removal rate and efficiency of multilayer spiral fog curtains are obviously stronger than those of natural dust reduction and traditional spray. After 3 minutes, a dust concentration of approximately 470 mg/m3 can be reduced to less than 4 mg/m3. The average dust removal rates of total dust and exhaled dust were 2.600 mg/(m3.s) and 0.189 mg/(m3.s), respectively, and the dust removal efficiencies were 97.01% and 94.32%.

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Section: Physical Model Establishmentmentioning

confidence: 99%

Research on the mechanism of multilayer spiral fog screen dust removal at the comprehensive excavation face

Jing

et al. 2022

PLoS ONE

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“…Fan et al, 2018;Wu et al, 2019). For this reason, dust monitoring control during the handling of different mining technologies requires extensive investigation, including information on the physicochemical characteristics of the deeply inhalable (particle size below 10 µm) and respirable fractions (particle size below 4 µm and 2.5 µm), both of which could be a key factor in the prevention of coal dust problems in mining, such as diverse authors are contributing (Zhang et al 2020;Szkudlarek and Janas 2021;Jiang and Luo 2021;Liu et al 2021;Reed et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Chemistry and particle size distribution of respirable coal dust in underground mines in Central Eastern Europe

Trechera

Querol

Lah³

et al. 2022

Int J Coal Sci Technol

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Despite international efforts to limit worker exposure to coal dust, it continues to impact the health of thousands of miners across Europe. Airborne coal dust has been studied to improve risk models and its control to protect workers. Particle size distribution analyses shows that using spraying systems to suppress airborne dusts can reduce particulate matter concentrations and that coals with higher ash yields produce finer dust. There are marked chemical differences between parent coals and relatively coarse deposited dusts (up to 500 µm, DD500). Enrichments in Ca, K, Ba, Se, Pb, Cr, Mo, Ni and especially As, Sn, Cu, Zn and Sb in the finest respirable dust fractions could originate from: (i) mechanical machinery wear; (ii) variations in coal mineralogy; (iii) coal fly ash used in shotcrete, and carbonates used to reduce the risk of explosions. Unusual enrichments in Ca in mine dusts are attributed to the use of such concrete, and elevated K to raised levels of phyllosilicate mineral matter. Sulphur concentrations are higher in the parent coal than in the DD500, probably due to relatively lower levels of organic matter. Mass concentrations of all elements observed in this study remained below occupational exposure limits.

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“…This leads to atmospheric pollution. Various scholars have developed mine dust removal methods and these can mainly be divided into dry and wet dust removal variants (Reed et al 2019;Zhang et al 2020). String grille dust removal technology is favored because it is suitable for large air volumes and high levels of pollution in a limited space.…”

Section: Introductionmentioning

confidence: 99%

Water film area and dust removal efficiency of string grilles: a theoretical analysis

Guo

Wang

Chen

et al. 2021

Int J Coal Sci Technol

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Based on multiphase flow theory and capillary mechanics, the dimensionless bond number expression of the influence of string grille wire spacing on droplet spreading is derived. Taking a liquid film formed by spreading droplets based on Kelvin correlation, the Young–Laplace equation, and the Hagen–Poiseuille law, an equation for calculating the thickness and height of the liquid film is established with temperature, relative humidity and molar volume of liquid phase as independent variables. According to the theory of string grille filtration and dust removal, a dust removal efficiency calculation model covering the wet string grille wire group is constructed based on the liquid film thickness, height, wire diameter, water film area, and vortex shedding frequency. Finally, a theoretical analysis of the influence of water film area on the efficiency of wet string grille dust removal is carried out based on the spray pressure and the ratio of string grille wire distance to wire diameter. It is found that the effect of spray pressure on water film area and dust removal efficiency is more significant than the string grille wire distance diameter ratio. Moreover, the optimized combination of wet string grille wire distance diameter ratio 0.84, wind speed 3 m/s and spray pressure 0.8 MPa is found, which could provide an important reference for engineering applications.

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Numerical simulation of the dimensional transformation of atomization in a supersonic aerodynamic atomization dust-removing nozzle based on transonic speed compressible flow

Cited by 23 publications

References 22 publications

Research on the mechanism of multilayer spiral fog screen dust removal at the comprehensive excavation face

Research on the mechanism of multilayer spiral fog screen dust removal at the comprehensive excavation face

Chemistry and particle size distribution of respirable coal dust in underground mines in Central Eastern Europe

Water film area and dust removal efficiency of string grilles: a theoretical analysis

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