A new pin-to-plate corona discharger with clean air protection for particulate matter removal

Gu, Yuting; Tian, Enze; Xia, Fanxuan; Yu, Tao; Afshari, Alireza; Mo, Jinhan

doi:10.1016/j.enbenv.2019.11.006

Cited by 21 publications

(4 citation statements)

References 31 publications

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“…(C)The scheme of the i‐PP film polarization process during corona discharges: a—a smooth film, b—a rough film 57 . (D) Schematic of a new pin‐to‐plate corona discharge module with clean air protection 59 . (E) Schematic showing the structures of c‐MP ionizers 60 …”

Section: Progress In Preparation Technology Of Electret Filtersmentioning

confidence: 99%

“…Therefore, it is imperative to develop corona dischargers with efficient charging and clean air protection capabilities. Gu et al 59 developed a novel pin‐to‐panel corona discharger (Figure 4D) that introduced filtered clean air into the box to prevent particles from being deposited on the pins during corona discharge. Gao et al 60 designed cascaded metal pin‐to‐ring electrodes (Figure 4E).…”

Section: Progress In Preparation Technology Of Electret Filtersmentioning

confidence: 99%

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Research of electret air filter: A review

Li,

Feng,

Chen

et al. 2024

Polymers for Advanced Techs

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The harmful effects of air pollution on humans are multifaceted and are closely linked to outbreaks of various infectious viruses. Thus, design of high‐performance air filters that are lightweight, flexible, and easy to prepare is urgent. The electret air filter can utilize the electrostatic force of charge to capture dust particles, making it efficient and convenient, which is highly favored by people. In this study, a summary of the research on electret filters for highly efficient air purification is presented. First, this study outlines the mechanisms of air filtration methods and discusses three factors that evaluate filter performance. The methods of manufacturing electret air filters are then presented, and the advantages and limitations of different methods are discussed. Then, electrification, including corona discharge, friction electrification, electrospinning, thermal electrification, and water electrification as methods, enhances the physical charge adsorption performance of materials, while the use of fluorinate polymer, non‐fluorinate polymer, and biobased polymer as functional substrates exhibits varying degrees of electrification effects. Different materials and manufacturing techniques give the filters additional advantages, such as being self‐degradable and antibacterial. Finally, the challenges that remain in the development of electret filters for use in air purification are also discussed in terms of material type and fabrication technology. It is expected that highly efficient air purification with low energy consumption can be achieved by electret filters with multifunctional capabilities.

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Section: Progress In Preparation Technology Of Electret Filtersmentioning

confidence: 99%

Section: Progress In Preparation Technology Of Electret Filtersmentioning

confidence: 99%

Research of electret air filter: A review

Li,

Feng,

Chen

et al. 2024

Polymers for Advanced Techs

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“…As people typically spend nearly 90% of their lives indoors, it is essential to control the transmission of pathogenic bioaerosols in indoor air. Fibrous filters are commonly used for particle removal in heating, ventilating, and air conditioning (HVAC) systems. − However, microorganisms captured on filter fibers can survive and even reproduce by absorbing air moisture and nutrients from other airborne dust. − These microorganisms may potentially cause microbial release into the downstream indoor air, leading to secondary risk to human health. In addition, volatile organic compounds produced by microbial metabolism, endotoxins, and exotoxins caused by division and death can also be emitted. − Therefore, it is vital to treat the fibrous filter with inactivating methods such as ozone release, photocatalytic oxidation, and ultraviolet germicidal irradiation .…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Capture and Inactivation of Airborne Bacteria by a Dual-Zone Electrostatically Actuated Filter

Xia,

Chen,

Gao

et al. 2024

ACS EST Eng.

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Maintaining indoor air quality is essential for human health, and the threat posed by bioaerosols emphasizes efficient capture and inactivation technologies in ventilation systems. However, existing technologies struggle to capture and inactivate bioaerosols simultaneously with low air resistance and integrated technologies make them inconvenient in practical applications. To address this challenge, we developed a dual-zone electrostatically actuated filter in which airborne bacteria are first charged by ions generated in the charging zone and then captured by the polarized fibers and inactivated in the electrostatic field of the polarizing zone. Benefiting from the enhanced electrostatic force, the capture efficiencies for Escherichia coli (Gram-negative) and Staphylococcus epidermidis (Gram-positive) aerosols of 0.3−0.5 μm diameter increased from ∼25.4 to ∼98.4% at 0.5 m/s filtering velocity while the air resistance was maintained at only 4.5 Pa. The capture efficiency remained steadily high for 30 days, with an average of 93.8%. Moreover, the combination of the continued ion flow and electrostatic field exposure significantly improved the inactivation efficiency against E. coli and S. epidermidis to ∼98.7 and ∼96.1%, respectively, instead of allowing bacterial reproduction on the coarse filter without electrostatic actuation. The proposed dual-zone electrostatically actuated filter exhibits great potential for incorporation into energy-saving ventilation systems, offering highefficiency capture and antimicrobial performance as well as low air resistance.

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“…Dust removal technologies are pivotal in mitigating the risks associated with combustible dust in industrial settings [4]. Many dust removal technologies can be used to improve air quality, such as mechanical dedusting, filtering technology, electrostatic precipitation, ultrasonic dedusting, pulse injection technology [5], corona dust removal technology [6], and Fischer-Tropsch synthesis [7]. Among these, mechanical dedusting stands out for its widespread application, offering advantages such as minimal spatial requirements, low construction costs, simplicity in operation, and the absence of moving parts.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Gas–Solid Separation Performance of Axial Flow Cyclone Separators

Mao,

Chertovskih,

Cai

2024

Inventions

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Cyclone separators, which have a high separation performance, play a crucial role in mitigating the occurrence of dust explosion incidents. This study aims to improve the performance of an axial cyclone separator using the results of simulations employing the RNG k-ε model together with a user-defined function to simulate the wall collision process. The effectiveness of various structural modifications to the vortex tube has been addressed. Specifically, we found that increasing the number of blades, reducing the blade exit angle, and adopting L-shaped blades increase separation efficiency. Additionally, enlarging the guide vane and exhaust pipe diameters, as well as increasing the exhaust pipe inclination angle, contribute to an improved separation performance due to the developed tangential velocity and vortex cores. However, it also increases the pressure drop losses due to the increase in the turbulence pulsation entropy and the wall entropy, while the time-averaged entropy is found to be less significant. As a result, our study sheds light on the flow characteristics, the gas–solid separation process, and the energy loss mechanism in the cyclone separator.

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A new pin-to-plate corona discharger with clean air protection for particulate matter removal

Cited by 21 publications

References 31 publications

Research of electret air filter: A review

Research of electret air filter: A review

Simultaneous Capture and Inactivation of Airborne Bacteria by a Dual-Zone Electrostatically Actuated Filter

Numerical Study of the Gas–Solid Separation Performance of Axial Flow Cyclone Separators

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