Abstract
ABSTRACT Both hybrid electrostatic filtration and agglomeration technologies can effectively improve the efficiency of fine particle collection. A hybrid electrostatic filtration system with a wire-tube bipolar precharger was developed on the basis of bipolar transverse plate electrostatic precipitation technology. Theoretical analyses of electric field and flow field distribution showed that a uniform electric field and high turbulence intensity improve ion migration and particle agglomeration in the novel wire-tube bipolar precharger. The influence of unipolar and bipolar prechargers on dust removal was investigated. In the hybrid electrostatic filtration system with the bipolar precharger, the corona current was 30% higher, the particles deposited on the surface of the filter bag were 19% larger, and the pressure drop was 30% smaller than a filtration system with a unipolar precharger. When silicon powder with a median diameter of 1.7 µm was used, the mean penetration of the experimental device with the bipolar precharger was 45% lower than that of the experimental device with the unipolar precharger.
Highlights
Hybrid electrostatic filtration systems are used in competitive approaches for achieving efficient control of fine particle emissions to meet stringent emission standards (Chang et al, 2019; Jaworek et al, 2019; Ni et al, 2018; Robert and Nallathambi, 2020)
The results indicate that the inception voltage was approximately 3 kV for the bipolar precharger and approximately 5 kV for the unipolar precharger
The corona current of the bipolar precharger was approximately 30% higher than that of the unipolar precharger at DC supply voltages between 11 and 13 kV
Summary
Hybrid electrostatic filtration systems are used in competitive approaches for achieving efficient control of fine particle emissions to meet stringent emission standards (Chang et al, 2019; Jaworek et al, 2019; Ni et al, 2018; Robert and Nallathambi, 2020). Higher face velocity, and lower pressure drops have been achieved by these hybrid electrostatic precipitators (Feng et al, 2016; Wang et al, 2016; Tu et al, 2018; Xiang et al, 2018). Another method of reducing fine particle emissions is to increase the particles’ size in an agglomerator before precipitation (Jaworek et al, 2007). Water vapor condensation, chemical agglomeration, and electrostatic agglomeration are the most frequently proposed methods (Deng et al, 2010; Hu et al, 2018; Liu and Li, 2020; Thonglek and Kiatsiriroat, 2014). Because of the complexity of their structure, electrostatic agglomerators have rarely been employed in hybrid electrostatic filtration systems
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