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- Title
Removal of air pollutant by a spike-tubular electrostatic device: Multi-stage direct current corona discharge enhanced electrostatic precipitation and oxidation ability.
- Authors
Tao, Shanlong; Zhu, Yong; Chen, Chen; Liu, Jiahua; Chen, Mingxia; Shangguan, Wenfeng
- Abstract
In this work, a spike-tubular electrostatic device was developed for effectively removing particulate matter (PM) and VOCs, based on multi-stage electric field enhancement and expanded arc interface ratio of corona discharge. In the experiment, it was equipped with a portable 12 V D.C. power supply module and a fan module; PM from moxa smoke, mainly composed of submicron particles with a high penetrate rate, and HCHO were employed to test its electrostatic precipitation and oxidation ability, respectively. Additionally, CFD numerical simulation was adopted to investigate the characteristics of the electric field, the flow field, and the ozone generation. Experimental results showed that the electrostatic device could remove 99% of the fine particles at 2 m/s. Meanwhile, it could also remove HCHO of 2.14 × 103-1.07 × 104 μg/m3 concentration with 100% efficiency. By comparison, its oxidation capacity could be about 80 times that of ozone oxidation, revealing the enhanced oxidation ability of other short-living reactive species. Simulation results proved that the promising purification performance resulted from the locally enhanced electric field strength, up to 2 × 107 V/m in the central region, and sufficient contact between pollutants and the corona discharge region. Finally, as verified by the airtight chamber cycle experiment and case comparison, the device owns feasible purification ability and promising energy yield (0.79 g/kWh) in the application. Moreover, prospects and strategies for the device's practical application in air purification and disinfection were proposed, which may provide helpful enlightenment for air purification.
- Subjects
ELECTROSTATIC precipitation; CORONA discharge; AIR pollutants; ELECTROSTATIC discharges; AIR purification; OZONE generators; WATER purification equipment
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2022, Vol 165, p347
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2022.06.069