Study of dust collection effectiveness in cyclonic-vortex action apparatus

The object of research is the efficiency of dust collection of fine dust in an apparatus with an intense turbulent mode of phase interaction. One of the most problematic areas of the existing dust and gas cleaning equipment is the low efficiency of collecting fine dust. Effective cleaning of exhaust gases from dust involves the use of multi-stage cleaning systems, including wet and dry dust cleaning devices, which entails high capital and operating costs. These disadvantages are eliminated in the developed design of the cyclone-vortex dust collector with two contact zones. The device implements both dry and wet dust collection mechanisms, which allows for high efficiency of dust removal at high productivity. The conducted studies of the total and fractional efficiency of dust collection when changing the operating parameters of the developed device showed that the efficiency of collecting fine dust is 98–99 %. The increase in the efficiency of dust collection in the dry stage of the device is due to an increase in centrifugal force. In the wet stage of contact, the efficiency reaches its maximum values due to the vortex crushing of the liquid in the nozzle zone of the apparatus. Studies of the fractional efficiency of the apparatus show that with an increase in the diameter of the captured particles, the efficiency of the dust collection process for dry and wet stages, as well as the overall efficiency, increases. With an increase in the density of irrigation, the overall efficiency of dust collection in the apparatus increases. It has been established that an increase in the efficiency of capturing highly dispersed particles occurs due to turbulent diffusion, the value of which is determined by the frequency of turbulent pulsations and the degree of entrainment of particles during the pulsating motion of packed bodies. To describe the results obtained, a centrifugal-inertial model for a dry contact stage and a turbulent-diffusion model of solid particle deposition for a wet contact stage are proposed, which make it possible to calculate the dust collection efficiency of the contact stages, as well as the overall efficiency of the cyclone-vortex apparatus. The results obtained show the prospects of using devices of this design at heat power plants and other industries.

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Dust emissions’ reduction into the atmosphere by environmental-engineering systems of smallsize devices with counter-swirling flows (CSF)

E3S Web of Conferences ◽

10.1051/e3sconf/201913801037 ◽

2019 ◽

Vol 138 ◽

pp. 01037

Author(s):

N.M. Sergina ◽

A.A. Sakharova ◽

V.N. Azarov ◽

D.V. Azarov ◽

M.A. Nikolenko

Keyword(s):

Collection Efficiency ◽

Swirling Flows ◽

Environmental Engineering ◽

Emissions Reduction ◽

Dust Collector ◽

Engineering Systems ◽

Collection System ◽

Dust Collection ◽

Dust Emissions ◽

Dust Collection Efficiency

The article discusses the features of using environmentalengineering systems of small-size devices with counter-swirling flows (CSF) to reduce dust emissions into the atmosphere. The reasons for the decrease of the dust collection efficiency by CSF systems are analyzed. The layout diagram of the dust collection system with CSF devices and the organization of suction from the dust collector hopper are given.

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Study on Water Spraying System in Wet Electrostatic Precipitator

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.423-426.1732 ◽

2013 ◽

Vol 423-426 ◽

pp. 1732-1736 ◽

Cited By ~ 1

Author(s):

Li Chun Xiao ◽

Zhi Jiang Ding ◽

Qiang Li

Keyword(s):

High Efficiency ◽

Electrostatic Precipitator ◽

Collection Efficiency ◽

Water Pressure ◽

Operating Voltage ◽

Electrostatic Precipitation ◽

Dust Collection ◽

Dust Collection Efficiency

The dust collected in the polar plates can be washed out by a spraying system in the wet electrostatic precipitator. It is important to keep the spraying system having a high efficiency lest the dust returns to the gas again. The performance of the spraying system in the electrostatic precipitation and its influence on the dust collection efficiency are presented in the paper. The atomization characteristic of the spraying nozzle is measured by changing the water pressure and operating voltage. The results show that: Collection efficiency of the electrostatic precipitation is over 99.5 % when the water pressure is 0.4 MPa.When the spraying mists diameter is 100 μm, the collection efficiency is 92 % for the dust diameter under 10 μm. It will provide a basis for the design of spraying system in wet electrostatic precipitation by this analysis.

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Study of a granular bed dust collector. Simulations of the dust collection efficiency.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.56.523 ◽

1990 ◽

Vol 56 (522) ◽

pp. 523-528

Author(s):

Kenzou WADA ◽

Takuya SUMIYOSHI ◽

Nobuo HAYANO ◽

Toshihiro KATAYAMA

Keyword(s):

Collection Efficiency ◽

Dust Collector ◽

Granular Bed ◽

Dust Collection ◽

Dust Collection Efficiency

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Research Progress on the Electric Coagulation of Fine Dust

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.955-959.2594 ◽

2014 ◽

Vol 955-959 ◽

pp. 2594-2599

Author(s):

Ruo Bai Ma ◽

Kai Quan Wang ◽

Hai Pu Bi

Keyword(s):

Electric Field ◽

Electric Fields ◽

Collection Efficiency ◽

Constant Electric Field ◽

Research Progress ◽

Charged Dust ◽

Fine Dust ◽

Dust Collection ◽

Advantages And Disadvantages ◽

Dust Collection Efficiency

Fine dust in the atmosphere is one of the key factors causing air pollution as well as fog and haze. Due to the limited efficiency of fine dust collection in conventional dust removal technology, pre-charged dust coagulation between particles to increase the effective collecting diameter, is an effective way to improve the dust collection efficiency. Currently, coagulation technology research falls into three mainly aspects: electric coagulation technology in constant electric field, alternating electric field and pulsed electric fields. The advantages and disadvantages as well as the research status and trends are fully analyzed in this paper, of which the technology that uses alternating or pulsed power supply for pre-charge device has more advantages and efficiency in coagulation. They will improve the efficiency of electric coagulation in further on the improved airflow pole with form and structure and the technical development of alternating or pulsed powers, which will make the coagulation and filtration technologies and new composite technology an important development direction of fine dust governance.

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Resource-saving technologies for cleaning gas emissions in the production of building materials

MATEC Web of Conferences ◽

10.1051/matecconf/201819604070 ◽

2018 ◽

Vol 196 ◽

pp. 04070 ◽

Cited By ~ 1

Author(s):

Tatiana Skorik ◽

Natalia Galkina ◽

Elena Glazunovà

Keyword(s):

Building Materials ◽

High Efficiency ◽

Construction Materials ◽

Chemical Properties ◽

Maximum Level ◽

Ambient Air ◽

Dust Collector ◽

Resource Saving ◽

Dust Collection ◽

Gas Cleaning

High requirements to ensure sanitary and hygienic working conditions and reduce harmful emissions into the environment are provided through ventilation systems equipped with efficient and economical equipment. The task of improving the air basin is to reduce the amount of harmful substances in the ambient air to the level of MPC and lower, which, with increasing volumes of ventilation and process emissions, determines the increased requirements for industrial filters. The most effective are wet devices, in which the process of gas cleaning is carried out through interaction with the liquid, most often with water. The authors developed a number of high-efficiency dust-collecting apparatuses, in which the majority of methods for contacting elements with a liquid are realized simultaneously, which determines the maximum completeness of gas purification from dusts with different physico-chemical properties. One of them is an aerohydrocyclone intended for combined simultaneous cleaning of a technological product in the form of a suspension and dusty air removed from the shelters of technological equipment. This apparatus with internal circulation of liquid, where the concentration of trapped dust in the irrigating liquid affects the efficiency of dust collection, the frequency of water replacement, the operating mode and the load of the water-slurry farm. The particulate materials of the slurry intensifies the process of dispersion, irrigating liquid and its structural viscosity, as well as the stability of the formed foam, which contributes to a more effective manifestation of various wet dust collection mechanisms.The implementation of the installation of a wet dust collector for complex cleaning in the technological line for the preparation of lime milk from the construction materials factory made it possible to reduce the concentration of dust in emissions at the maximum level of ensuring the economy of aspiration systems. The obtained results testify to the positive experience of the operation of wet dust collectors for complex cleaning in the building materials industry, and the regularities connecting the operation modes of the apparatus with the properties of trapped dusts and the features of technological processes make it possible to recommend them for use in various enterprises.

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

Polish Journal of Chemical Technology ◽

10.1515/pjct-2017-0060 ◽

2017 ◽

Vol 19 (4) ◽

pp. 1-7 ◽

Cited By ~ 2

Author(s):

Janusz Krawczyk

Keyword(s):

High Efficiency ◽

Liquid Surface ◽

Collection Efficiency ◽

Dust Particles ◽

Dust Collection ◽

Simultaneous Formation ◽

Liquid Recirculation ◽

Collection Process ◽

Wet Scrubbers ◽

Dust Collection Efficiency

Abstract The high efficiency of industrial wet scrubbers is the result of a simultaneous formation of dust particle collectors. 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 a circulating unit. The efficiency of dust collection process also depends on the ability of dust particles to be absorbed by collectors. The study provides an experimental analysis of the effect of the increasing concentration of a dust collection liquid in the conditions of full liquid recirculation on the efficiency of dust collection process in the examined types of collectors.

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Tailoring the Geometry of Bottom-Up Nanowires: Application to High Efficiency Single Photon Sources

Nanomaterials ◽

10.3390/nano11051201 ◽

2021 ◽

Vol 11 (5) ◽

pp. 1201

Author(s):

Dan Dalacu ◽

Philip J. Poole ◽

Robin L. Williams

Keyword(s):

Quantum Dot ◽

High Efficiency ◽

Emission Rate ◽

Single Photon ◽

Collection Efficiency ◽

Photon Emission ◽

Device Performance ◽

Bottom Up ◽

Selective Area ◽

Photon Generation

For nanowire-based sources of non-classical light, the rate at which photons are generated and the ability to efficiently collect them are determined by the nanowire geometry. Using selective-area vapour-liquid-solid epitaxy, we show how it is possible to control the nanowire geometry and tailor it to optimise device performance. High efficiency single photon generation with negligible multi-photon emission is demonstrated using a quantum dot embedded in a nanowire having a geometry tailored to optimise both collection efficiency and emission rate.

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INFLUENCE OF THE EFFECT OF ELECTROHYDRODYNAMIC DISINTEGRATION OF CHARGED DROPS ON FINE DUST COLLECTION IN WET SCRUBBERS

Journal of Aerosol Science ◽

10.1016/s0021-8502(21)00426-2 ◽

2001 ◽

Vol 32 ◽

pp. 947-948

Author(s):

AN. M. BOLOGA ◽

AL. M. BOLOGA ◽

H.-R. PAUR ◽

H. SEIFERT

Keyword(s):

Fine Dust ◽

Dust Collection ◽

Wet Scrubbers

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Unsteady Modeling of Powdered Activated Carbon Deposition on Collection Electrode of a Lab-Scale Electrostatic Precipitator (ESP)

Volume 1: Symposia, Parts A and B ◽

10.1115/fedsm2012-72409 ◽

2012 ◽

Author(s):

Yasmin Khakpour ◽

Herek L. Clack

Keyword(s):

Activated Carbon ◽

Particle Deposition ◽

Electrostatic Precipitator ◽

Activated Carbons ◽

Collection Efficiency ◽

Continuous Phase ◽

Powdered Activated Carbon ◽

Computational Domain ◽

Discrete Phase Model ◽

Discrete Phase

Particulate sampling in the flue gas at the Electrostatic Precipitator (ESP) outlet during injection of powdered activated carbons (PACs) has provided strong anecdotal evidence indicating that injected PACs can penetrate the ESP in significant concentrations. The low resistivity of PAC is consistent with poor collection efficiency in an ESP and lab-scale testing has revealed significantly different collection behavior of PAC in an ESP as compared to fly ash. The present study illustrates the use of a commercial CFD package — FLUENT — to investigate precipitation of powdered activated carbon (PAC) in the presence and absence of electric field. The computational domain is designed to represent a 2-D wire-plate ESP channel. The governing equations include those covering continuous phase transport, electric potential, air ionization, and particle charging. The particles are tracked using a Lagrangian Discrete Phase Model (DPM). In addition, a custom user-defined function (UDF) uses a deforming boundary condition and a prescribed critical particle velocity to account for particle deposition and dust-cake growth on the electrodes. The effect of Electrohydrodynamics (EHD) induced flow on the ESP collection efficiency under various flow and particle characteristics as well as different ESP configurations are illustrated.

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