Experimental and theoretical analysis of loading characteristics of electret filter media for charged particles

IF 4.1 2区材料科学 Q2 ENGINEERING, CHEMICAL Particuology Pub Date : 2024-06-21 DOI:10.1016/j.partic.2024.06.007

Yiqi Cai , Rongrong Cai , Lizhi Zhang

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Abstract

The degradation of filtration performance in electret filter media during usage poses a significant challenge. Pre-charging of aerosols has been identified as an effective method to mitigate this issue. However, the effects of particle charging characteristics on the loading characteristics of electret filters still need a comprehensive understanding. In this study, a needle-cylinder corona charger was employed to pre-charge aerosols, and the particle charge state was determined by multiphysics simulation. The effects of particle charge polarity and charge quantity on the loading performance of the electret filter were quantitatively investigated. The results showed that the particle charge polarity had a negligible impact on the loading performance under the condition of the equivalent particle charge quantity. In addition, the charged particles effectively improved the efficiency degradation during the loading process of electret media, with higher charge quantities resulting in more pronounced improvements. The electrostatic attenuation factor showed a negative exponential correlation with the particle charge quantity. This was attributed to the uneven particle deposition on fiber surface due to the attraction of charged particles by the opposite charges on the electret fibers, which alleviated the effect of electrostatic shielding.

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带电粒子驻极体过滤介质负载特性的实验和理论分析

驻极体过滤介质在使用过程中过滤性能下降是一个重大挑战。预充气溶胶被认为是缓解这一问题的有效方法。然而，颗粒充电特性对驻极体过滤器负载特性的影响仍需全面了解。本研究采用针筒式电晕充电器对气溶胶进行预充电，并通过多物理场模拟确定粒子的电荷状态。定量研究了粒子电荷极性和电荷量对驻极体过滤器负载性能的影响。结果表明，在等效颗粒电荷量的条件下，颗粒电荷极性对装载性能的影响可以忽略不计。此外，带电粒子能有效改善驻极体介质加载过程中的效率衰减，电荷量越高，改善效果越明显。静电衰减系数与粒子电荷量呈负指数关系。这是因为带电粒子被驻极体纤维上的相反电荷吸引，导致粒子在纤维表面沉积不均匀，从而减轻了静电屏蔽效果。

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.