Change in dust collection efficiency of liquid collectors in conditions of dedusting liquid recirculation

Krawczyk, J.

doi:10.1515/pjct-2017-0060

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…All of mentioned collectors can be observed in a circulating scrubber unit [1], presented in Fig.1. The operation of the unit is similar to typical Roto-Clone Type N scrubbers [2,14,[15][16][17][18][19][20][21][22] with one differencethe presented solution does not contain the so-called dirty chamber, moving it to the bottom part of the chamber. Fig.…”

Section: Gas Through the Droplet-splash Layer Discussion Substantiamentioning

confidence: 99%

“…Fig. 2b shows a schematic representation of dust collectors formed in the guide and the separation space of the unit [16]. The deposition of dust particles from gas occurs as a result of centrifugal forces and secondary circulations in the guide duct as well as the effect of the water curtain, liquid barbotage and the flow of dusty gas through the droplet-splash layer.…”

Section: Gas Through the Droplet-splash Layer Discussion Substantiamentioning

confidence: 99%

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Mechanisms of Trapping Fine Dust in Wet Dust Collecting Apparatus

Krawczyk¹,

Kocewiak²,

Talaga³

et al. 2019

IVKKT

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The high efficiency of intensive operation of wet scrubbers is the result of a simultaneous formation of different mechanisms of dust particle collectors. The collectors can be understood as droplets of atomised liquid, bubbles formed in the conditions of intensive barbotage, liquid surface and wet surfaces. All collectors are formed during the operation of the circulating unit. The deposition of dust particles from gas occurs as a result of centrifugal forces and secondary circulations in the guide duct as well as the effect of the water curtain, liquid barbotage and the flow of dusty gas through the droplet-splash layer. Discussions substantiating the possibility of confirming the effect of suspension viscosity on the efficiency of the dust collection process can be related both to the analysis of basic mechanisms affecting the deposition of particles on liquid collectors and the conditions of generating collectors. In total liquid recirculation in wet dedusting equipment, concentration of solids in a liquid rises. In such conditions, a gradual decrease in their dedusting efficiency is possible. The effect depends on dust physiochemical properties, kinetic energy of particles, the type of equipment used, and specifically on the way of organization of the contact of the liquid and gas phases. Studies of the effectiveness of dedusting depending on various factors are given in the next article by the same authors.

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Section: Gas Through the Droplet-splash Layer Discussion Substantiamentioning

confidence: 99%

Section: Gas Through the Droplet-splash Layer Discussion Substantiamentioning

confidence: 99%

Mechanisms of Trapping Fine Dust in Wet Dust Collecting Apparatus

Krawczyk¹,

Kocewiak²,

Talaga³

et al. 2019

IVKKT

Self Cite

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show abstract

“…Dedusting measures for mine dust have been rapidly developed to address this problem. e main dedusting measures are coal seam water injection, ventilation dedusting, spray dedusting, and dust collector dedusting [6][7][8][9]. However, dust removal efficiency remains low, especially for respirable dust [10].…”

Section: Introductionmentioning

confidence: 99%

Model and Experiment on Resistance Loss of Wet Chordal Grid with Spray Pressure and Structural Parameters

Guo

Wang

2021

Mathematical Problems in Engineering

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To reduce the dedusting resistance of wet vibrating string grille precipitators during dedusting in mine ventilation roadways, we investigated the dedusting resistance characteristics of water fog and water film coupling and determined the relationship between dedusting resistance and spray pressure, vibrating grid filling rate, and wind speed. A mathematical resistance coefficient model is established using hydrodynamics theory and capillary mechanics. The theoretical relationship of dedusting resistance is deduced. The results show that when wind speed is constant, the spray pressure and dedusting resistance are higher and the resistance is smaller with a high filling rate compared with a low filling rate. Constant spray pressure allows faster wind speeds and reverse pressure gradient forces to increase when dust flows around the wet vibrating wire, which makes the pressure distribution asymmetrical around the steel wire and increases resistance. Dust removal resistance of the resonance chord with a high filling rate is substantially lower than that with a low filling rate under the same working conditions. On the basis of satisfying the dedusting efficiency, the resonance chord dedusting system does not affect normal production and resistance is low. The spray pressure is controlled at 0.3–0.7 MPa and the optimal wind speed is 3–4 m/s. According to the theoretical calculation and experimental data, the optimal filling rate of a vibrating string grid plate is 77.8%, spray pressure is 0.7 MPa, and wind speed is 3.5 m/s. Dust removal with low resistance and improved economic benefit can thus be obtained.

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Column Dust Scrubber Based on an Orifice Plate to Intensify Gas‐Liquid Mixing

Zhang

et al. 2019

Chem Eng & Technol

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A column dust scrubber based on an orifice plate is developed for small and medium‐sized enterprises in China, which urgently need small‐volume, large‐flow scrubbers. The scrubber uses an orifice plate to evenly distribute the gas flow, which forms a uniform and stable impact on the liquid phase. As a result, dust removal via intensified gas‐liquid mixing can be achieved. A laboratory orifice plate scrubber model is developed, prototyped, and preliminarily studied considering the working process of the scrubber (mixed gas‐liquid flow pattern), liquid level, gas flow rate, pressure drop characteristics, dust removal efficiency, etc. The scrubber can achieve a good gas‐liquid mixing state when it is in a stable liquid column flow pattern. The drag coefficient of the scrubber is affected by the discharge of the gas stream to the liquid phase.

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Change in dust collection efficiency of liquid collectors in conditions of dedusting liquid recirculation

Cited by 6 publications

References 17 publications

Mechanisms of Trapping Fine Dust in Wet Dust Collecting Apparatus

Mechanisms of Trapping Fine Dust in Wet Dust Collecting Apparatus

Model and Experiment on Resistance Loss of Wet Chordal Grid with Spray Pressure and Structural Parameters

Column Dust Scrubber Based on an Orifice Plate to Intensify Gas‐Liquid Mixing

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