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Characteristics of dust-collection efficiency and ozone emission by highvoltage electrode shape of electrostatic precipitator for subway tunnel environment

Title
Characteristics of dust-collection efficiency and ozone emission by highvoltage electrode shape of electrostatic precipitator for subway tunnel environment
Author
육세진
Keywords
Electrostatic precipitator; Subway particle; Electrode shape; Ozone emission
Issue Date
2020-03
Publisher
KOREAN SOC MECHANICAL ENGINEERS
Citation
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v. 34, no. 3, page. 1351-1363
Abstract
The air pollution level of particulate matters in subway tunnel environments is severe. The present study conducted experimental measurements and analyses on dust-collection efficiencies and ozone emission rates in a lab-scale wind tunnel to determine a high-voltage electrode shape suitable for an electrostatic precipitator to remove airborne particles in subway tunnels. Six high-voltage electrode shapes (saw-type, few-saw-type, short-saw-type, tree-type, wave-type, and spike-type) were tested. The results indicate that while breakdown voltage of the spike-type high-voltage electrode was 66 % of other electrode shapes, its dust-collection efficiency per unit voltage was similar to that of other electrode shapes. However, the dust-collection efficiency per unit of power in the spike-type high-voltage electrode was significantly low. Moreover, the wave-type high-voltage electrode shape had 20 % lower dust-collection efficiency than the saw-type and tree-type high-voltage electrode shapes under conditions of low voltage and high flow velocities. Ozone emission rates for all shapes increased proportionally to the electric current. However, ozone emission rates for each high-voltage electrode shape are varied as 12-23 mu g/s per mA. The saw-type and tree-type high-voltage electrode shapes were superior in terms of dust collection, 90 % collection efficiency was shown at about 1.5 W/(m/s)(2). The saw-type had a lower ozone emission rate (16.4 mu g/s per mA) than the tree-type (19.6 mu g/s per mA). Thus, the saw-type shape was the most suitable as a high-voltage electrode in the electrostatic precipitator for removing airborne particles in a subway. The results also indicate that both dust-collection efficiencies and ozone emission rates should be evaluated concurrently when evaluating electrostatic precipitator high-voltage electrodes.
URI
https://link.springer.com/article/10.1007%2Fs12206-020-0233-1https://repository.hanyang.ac.kr/handle/20.500.11754/165124
ISSN
1738-494X; 1976-3824
DOI
10.1007/s12206-020-0233-1
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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