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
Authors
배귀남신유환이승복김종범우상희이재인육세진
Issue Date
2020-03
Publisher
Journal of Mechanical Science and Technology
Citation
VOL 34-1363
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 simi lar 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 mg/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 mg/s per mA) than the tree-type (19.6 mg/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
http://pubs.kist.re.kr/handle/201004/72488
ISSN
1738-494X
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