Experimental study of the dust-removal performance of a wet scrubber

Hu, Shengyong; Feng, Guorui; Hu, Fei; Liu, Changhe; Li, Jihua

doi:10.1007/s40789-021-00410-y

Cited by 29 publications

(13 citation statements)

References 16 publications

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“…Thus, in the VCB underground mine, PSD analysis of very low moisture dust samples yield DD 2.5 fractions reaching up to 23% DD 500 . The efficiency of wetting DD in reducing coal mine worker exposure to dust, as well as in preventing coal dust explosions, is very well documented (Woskoboenko 1988;Küçük et al 2003;Kuai et al 2012;Yuan et al 2014;Ajrash et al 2017;Azam et al 2019;Hu et al 2021;Zhang et al 2021). Küçük et al (2003) and Yuan et al (2014) found that a decrease in the dust fraction below < 125 µm can be achieved by increasing the moisture content of deposited coal dust.…”

Section: Particle Size Distributionmentioning

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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Section: Particle Size Distributionmentioning

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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“…Kalman et al [23] determined the effect of the lifting force of the particles and the rotation speed on the removal rate during particle collection. Through an experimental study of dust removal efficiency, Hu et al [24] found that changes in the dust structure affect the suction efficiency. The particle composition was changed consequently to establish an empirical correlation for particles through experiments.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Factors Affecting Particle Suction Efficiency of Pick-Up Head of a Regenerative Air Vacuum Sweeper

et al. 2022

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The influence of variable operational conditions affects the performance of particle collection and separation of a regenerative air vacuum sweeper. Therefore, the purpose of this paper was to numerically investigate the factors affecting the particle suction efficiency of the pick-up head. Using computational fluid dynamics (CFD), a model of an integrated pick-up head was developed based on the particle suction process to evaluate the particle removal performance. The realizable k-ε and discrete particle models were utilized to study the gas flow field and solid particle trajectories. The particle structure, sweeping speed, secondary airflow, pressure drop, and distance between the particle suction port and the road surface, as factors that affect the particle removal efficiency, were investigated. The results indicate that the particle suction efficiency increases with decreasing sweeper speed. Furthermore, the particle overall removal efficiency increased with a reduction in the distance between the suction port and the road surface as well as the control of the secondary airflow in the system. By increasing the airflow rate at the suction port, high efficiencies were achieved at a high sweeper speed and high particle densities. At a sweeper speed of 6–10 km/h, the results showed that the secondary airflow recirculation varied between 60 to 80 %, while the high-pressure drop ranged from 2200 to 2400 Pa, and the particle suction efficiency recorded was 95%. The numerical analysis results provide a better understanding of the particle suction process and hence could lead to an improvement in the design of the pick-up head.

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“…Additionally, Hu et al [14] presented methods to improve dust removal performance by experimentally studying the effects of changes in dust composition on cleaning efficiency. Overall, the total dust and respirable dust removal efficiency were 96.81% and 95.59%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Dust Particle Suction Efficiency by Controlling the Airflow of a Regenerative Air Sweeper

et al. 2022

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In a regenerative air sweeper, airflow and dust particles entering the system are filtered and recirculated within the system. The uncirculated portion of the exhaust air in the system spreads to the ambient air, and PM2.5 dust in the air can poison the environment and adversely affect human health. The development of an airflow control system to reduce road dust emissions and improve air quality was the main contribution of this study. A regenerative air sweeper airflow control system is designed to direct the air from the centrifugal fan back into the pickup head to fully absorb the dust particles and balance the positive and negative air pressures inside the pickup head. The modeling and analysis of the dust control system were performed using an experimental test rig system. A mathematical model of the fundamental parameters of the regenerative air sweeper and dust control system was established. Computational fluid dynamics (CFD) ANSYS was used for the analysis to determine the direction of airflow via the suction and inlet ducts. The discrete particle model (DPM) accurately predicted particle trajectories and measured the suction efficiency of particles of different shapes and types. By controlling the circulating harmful air flow in the system, the amount of PM2.5 released into the atmosphere was reduced by 90%. The suction efficiency of the 200 μm sized sand particles was higher than 95%. The results provide theoretical and methodological assistance for the development of improved road sweeper dust control systems.

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Experimental study of the dust-removal performance of a wet scrubber

Cited by 29 publications

References 16 publications

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

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

Numerical Study of Factors Affecting Particle Suction Efficiency of Pick-Up Head of a Regenerative Air Vacuum Sweeper

Improvement of Dust Particle Suction Efficiency by Controlling the Airflow of a Regenerative Air Sweeper

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