Application and research of dry-type filtration dust collection technology in large tunnel construction

Li, Shihang; Zhou, Fang; Wang, Fei; Xie, Biao

doi:10.1016/j.apt.2017.10.003

Cited by 52 publications

(12 citation statements)

References 12 publications

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“…The throat-nozzle distance and contraction angle of the suction chamber were set to a value of 12mm and 20 ∘ , respectively, and the simulations were conducted under different mixing throat lengths of the 540mm, 450 mm, 360 mm, 270 mm, and 180 mm. The ratios for (the length to diameter of throat) were 35,30,25,20,15 Figure 5 shows the changes in air entrainment under 6 different values of R . As illustrated in the figure, the air entrainment reaches its highest point when R is 20 and falls to its lowest point when the R is 35.…”

Section: The Effect Of the Length Of Throat On Air Entrainmentmentioning

confidence: 99%

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Numerical Simulation of Air Entrainment Performance of a Foam Generator Used for Dust Control in Coal Mines

Wang

Tang

2019

Mathematical Problems in Engineering

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Mine dust is one of the most serious environmental hazards in the coal mining process. This paper introduces a numerical simulation of a novel foam generator used for dust control in coal mines. The amount of foam generated by this device significantly depends on the amount of air entrainment. Therefore, a computational fluid dynamics (CFD) method was used to study three influencing factors, namely, throat-nozzle distance, mixing throat length, and the contraction angle of the suction chamber. The predicted values by the CFD simulation proved to be in good agreement with the experimental data. The results revealed that the air entrainment reached its maximum when the ratio of throat-nozzle distance to mixing throat length was 2/3. The optimum values of the throat ratio (its length to diameter) and the contraction angle of the suction chamber were obtained at 20 and 5 ∘ , respectively. This research provides essential guidance in the geometric parameter design of the self-suction type foam generator, which has the advantage of negating the need for compressed-air pipelines and having high reliability, compared to traditional foam generators.

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Section: The Effect Of the Length Of Throat On Air Entrainmentmentioning

confidence: 99%

“…There are various technologies for mine dust control, such as water sprays [8][9][10][11][12], air-curtains [13,14], dust collectors [15], wetting agents (surfactants) [16,17], and foams [18,19]. Among them, foam technology plays an extremely significant role.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Air Entrainment Performance of a Foam Generator Used for Dust Control in Coal Mines

Wang

Tang

2019

Mathematical Problems in Engineering

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“…② When the induced airflow and lump coal fall together to hit the lower belt, the direction of motion of both are compelled to change, which stirs up the dust particles adhered to the belt surface. ③ The dust particles carried by induced airflow spit out from the outlet of skirt plate [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Study on the characteristics of induced airflow and particle dispersion based on the multivariate two-factor model

Fan

Chen

et al. 2022

PLoS ONE

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To examine the diffusion characteristics of airflow and dust particles, a multi-factor and multi-level physical self-developed testing system is established. In this study, bunker height, chute angle, feeding speed, coal granularity, and belt speed are selected as independent variables, and airflow velocity and dust concentration are the response variables. The two-factor interactive model is established to analyze the primary and secondary relationship between the independent variables and the response variables. The results demonstrate a denser contour distribution of three-dimensional curved surfaces, suggesting an obvious interaction between the factors. The bunker height increases from 0.75 m to 1.15 m, the maximum increment of the induced airflow velocity at the outlet of the guide chute is observed to be 0.35 m/s, meanwhile, and with the increase in the feed speed from 2t/h to 8t/h, the increment of the induced airflow velocity at the outlet of the guide chute is recorded to be 51%. The coal granularity and bunker height depicted the highest influence on induced air velocity and dust concentration, and the feeding speed proved to be the secondary parameter. This two-factor interactive model can accurately forecast the actual values with a deviation of the calculated values limited to 9%. These research results support the existing research and provide a theoretical foundation to guide the dust control at belt conveyor transfer stations.

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“…In particular, the bag filter system is the most commonly applied in various industrial fields. For example, such systems have been installed in municipal garbage incineration facilities and coal-fired power plants [1][2][3][4][5][6], and their primary role is to exhibit enough mechanical strength to collect dust particles and withstand the related pressure drop. Therefore, the structure of bag filters, particularly those made of nonwoven fabric, consist of densely packed, relatively thick fibers [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Surface Finish of Nonwoven Fabric Bag Filters on Filter Efficiency

et al. 2021

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The effects of the surface finish of the bag filter for industrial use on the spatial distributions of the fiber mass, air permeability, and thickness were examined using a nonwoven fabric filter made of polytetrafluoroethylene (PTFE) with no surface finish and two nonwoven fabric filters made of PTFE with different surface finishes, i.e., resin finish and membrane finish. The surface finish had no impact on the non-uniformity in air permeability distribution. However, the air permeability of the filters was reduced with the use of a surface finish. In addition, the specific filtration resistance of the filter media increased by approximately 1.2 times in the case of the resin finish and 4.2 times for the membrane finish. Hence, the influence of the membrane finish on the filter efficiency is extremely strong.

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Application and research of dry-type filtration dust collection technology in large tunnel construction

Cited by 52 publications

References 12 publications

Numerical Simulation of Air Entrainment Performance of a Foam Generator Used for Dust Control in Coal Mines

Numerical Simulation of Air Entrainment Performance of a Foam Generator Used for Dust Control in Coal Mines

Study on the characteristics of induced airflow and particle dispersion based on the multivariate two-factor model

Effects of Surface Finish of Nonwoven Fabric Bag Filters on Filter Efficiency

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