Bipolar Precharger for Hybrid Electrostatic Filtration Systems

Chang, Yufeng; Shi, Lei; Jia, Pei

doi:10.4209/aaqr.210199

Aerosol Air Qual. Res.

2021

DOI: 10.4209/aaqr.210199

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Bipolar Precharger for Hybrid Electrostatic Filtration Systems

Yufeng Chang

Lei Shi

Pei Jia

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Cited by 6 publications

(1 citation statement)

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“…The particles are charged by the ions generated by corona discharge and co-flowing with the gas. Similar solutions but using bipolar prechargers to promote simultaneous particles agglomeration were used by Chang et al [51] and Jia and Lin [52]. A palisade of spiked rods of tips facing a parallel palisade of smooth rods and generating International Conference on Electrostatics 2023 Journal of Physics: Conference Series 2702 (2024) 012009…”

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Hybrid electrostatic filtration systems for exhaust gas cleaning

Jaworek,

Sobczyk,

Marchewicz

et al. 2024

J. Phys.: Conf. Ser.

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Emission of submicron and nanoparticles by industrial processes, like coal or biomass combustion, solid waste incineration, cement kiln heating, and glass production is a serious environmental problem. The application of most effective bag filters is limited due to very high temperature of the exhaust gases from most of these processes, sometimes >1000 K, which the filter material cannot resists. Cyclones, which could be resistant to these temperatures, are not effective for PM2.5 particles removal, which are the most abundant in these processes. Electrostatic precipitators remove dust from flue gases with high mass collection efficiency, but in submicron range (~100 nm to 1 μm) the so called “penetration window” occurs, in which the fractional collection efficiency decreases even below 50% at minimum. Hybrid electrostatic filtration systems, which combines various conventional gas-cleaning devices were therefore proposed and tested in several research papers, in order to improve the overall collection efficiency of the precipitation processes. The heart in all of these devices is an electrostatic particle charger, which can be a conventional electrostatic precipitator, a corona-discharge particle precharger, or electrostatic particle agglomerator. After charging and/or agglomeration, the particles can be further removed by other devices like cyclones, electrostatic precipitators, or bag filters (after gas cooling to an allowable temperature). The paper reviews specific problems encountered in exhaust gas cleaning from various industrial processes, and the most interesting constructions designed for this goal. In particular, an example of a system comprising a unipolar electrostatic agglomerator, which simultaneously charges the particles and agglomerates them in alternating electric field, for the formation of aggregates of finer particles (PM1) with larger species, which could be removed by any conventional gas cleaning device, with sufficiently high collection efficiency, has been discussed in details.

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confidence: 99%

Hybrid electrostatic filtration systems for exhaust gas cleaning

Jaworek,

Sobczyk,

Marchewicz

et al. 2024

J. Phys.: Conf. Ser.

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Study on electric agglomeration of bipolar-charged coal-fired fly ash particles and its effect on filtration performance of fibrous filter

Shen

et al. 2023

Clean Techn Environ Policy

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Hybrid filtration of sinter dust: an alternative for air pollution control in steel industries

de Castro,

Andrade,

de Lacerda

et al. 2024

Braz. J. Chem. Eng.

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Bipolar Precharger for Hybrid Electrostatic Filtration Systems

Cited by 6 publications

References 18 publications

Hybrid electrostatic filtration systems for exhaust gas cleaning

Hybrid electrostatic filtration systems for exhaust gas cleaning

Study on electric agglomeration of bipolar-charged coal-fired fly ash particles and its effect on filtration performance of fibrous filter

Hybrid filtration of sinter dust: an alternative for air pollution control in steel industries

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