Experiment and Research of Chemical De-dusting Agent with Spraying Dust-settling

Wang, Naiguo; Nie, Wen; Weimin, Cheng; Liu, Yanghao; Liang, Zhiting; Zhang, Lei

doi:10.1016/j.proeng.2014.10.494

Cited by 17 publications

(2 citation statements)

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“…External spraying is when a spray field forms around a coal mining drum and droplets are then used to capture coal dust particles [6]. Solution properties [7][8][9], nozzle size [10], spray pressure [11], and airflow conditions [12] are important factors in the effectiveness of spray dust reduction, for which scholars have carried out a large number of studies. Zhou et al [13] investigated the effect of spray pressure and nozzle caliber on the atomization of the spray, and the results showed that the atomization effect of the spray was best when the nozzle diameter was 1.5 mm and have carried out a large number of studies.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on Dust Control: Evaluating the Impact of Spray Angle and Airflow Speed in the Coalescence of Droplets and Dust

2024

Processes

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Spray dust reduction is one of the most economical and effective technologies for controlling coal dust in coal mining faces. We aimed to reproduce a spray dust reduction process in a simulation and investigate the mechanism by which the spray angle and airflow speed influence the dust reduction effect. Based on the DPM (discrete phase model) and the mixture model, we constructed a spray dust reduction evaluation model by considering two-way momentum coupling between the discrete phase and the continuous phase. The results showed that installing nozzles near the dust source (coal mining drum) significantly reduced the dust concentration at the coal mining face from 0.0005 kg/m3 to 0.0001 kg/m3. The increase in airflow speed and spray angle enhanced the horizontal transportation of droplets and dust, providing opportunities for the droplets to condense the dust; however, if the droplets have too large an angle, this will result in an insufficient concentration of droplets in the vicinity of the dust source. When the spray angle is 45°, increasing the airflow speed provides a better dust reduction effect. The nozzle position should also be set scientifically according to the airflow speed. Based on simulation results, a mathematical calculation model of spray dust reduction efficiency was constructed. These results can guide the key parameters of spray dust reduction systems, such as the installation position of the nozzle, the spray angle, and the airflow speed. This paper provides ideas for simulating spray dust reduction for other dust types.

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Section: Introductionmentioning

confidence: 99%

A Numerical Study on Dust Control: Evaluating the Impact of Spray Angle and Airflow Speed in the Coalescence of Droplets and Dust

2024

Processes

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“…Nevertheless, more and more studies on dust suppressants of today are focused on the control of dust generated by tunnel boring machines on the mining face of coal mines (Wang et al., 2016; Xiao and Zhao, 2015). This type of dust suppressant functions by reformulating surfactants to decrease surface tension of water through synergistic interaction, thus facilitating the moistening of coal powders, but it has the disadvantages of low viscosity, poor solidifying effect, and failure of generating a film (Ding et al., 2016; Naiguo et al., 2014; Zeng et al., 2009). What’s worse, there are a large amount of hydrophobic groups in coal dust which have poor water holding capacity, so a composite dust suppressant cannot solve the issue of fugitive dusts in coal mines with open sources of dust (Gosiewska et al., 2002; Zhu and Wang, 2012).…”

Section: Introductionmentioning

confidence: 99%

Solidifying dust suppressant based on modified chitosan and experimental study on its dust suppression performance

Liu

Nie

et al. 2017

Adsorption Science & Technology

109

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In view of the fugitive dusts caused by wind disturbance and material handling in coal bunkers, surface plants, and open-air coal stocking yards of coal businesses, the solidifying dust suppressant based on modified chitosan is synthesized and prepared through the chemical modification of-NH 2 with chitosan as a raw material and-NH 2 was replaced by-CH 2 CH(OH)CH 2 N þ (CH 3)CI À through the technique of Fourier transform infrared spectroscopy. According to viscosity experiment results, the viscosity of the modified solidifying dust suppressant increased significantly. The coal particles suppressed by the dust suppressant as observed with a 50,000X scanning electron microscope were coagulated together, which indicated very good cohesion effect. In addition, wind erosion resistance experiment was conducted to analyze the wind erosion rate of coal powders before and after sprayed with the suppressant at different wind speeds, which indicated that the dust suppressant can effectively prevent fugitive dusts at a wind speed of 17 m/s.

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Experimental study of wetting effect of surfactant based on dynamic wetting process and impedance response of coal

Wei

Jiang

et al. 2022

Environ Sci Pollut Res

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Experiment and Research of Chemical De-dusting Agent with Spraying Dust-settling

Cited by 17 publications

References 0 publications

A Numerical Study on Dust Control: Evaluating the Impact of Spray Angle and Airflow Speed in the Coalescence of Droplets and Dust

A Numerical Study on Dust Control: Evaluating the Impact of Spray Angle and Airflow Speed in the Coalescence of Droplets and Dust

Solidifying dust suppressant based on modified chitosan and experimental study on its dust suppression performance

Experimental study of wetting effect of surfactant based on dynamic wetting process and impedance response of coal

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