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 μg/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 μg/s per mA) than the tree-type (19.6 μg/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.
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Abbreviations
- η i :
-
Collection efficiency
- C dw,i :
-
Downstream particle number concentration
- C up,i :
-
Upstream particle number concentration
- d p :
-
Particle diameter
- k :
-
Boltzmann constant
- T :
-
Kelvin temperature
- K E :
-
Constant of proportionality
- E :
-
Electric field strength
- Zi :
-
Mobility of the ions
- ɛ :
-
Relative permittivity
- M :
-
Molecular weight
- N :
-
Volume of air per one mole
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Acknowledgments
This research was supported by the Railway Technology Research Project, funded by the Ministry of Land, Infrastructure, and Transport (18RTRP-B082486-05), Republic of Korea.
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Sang-Hee Woo was post doctor of the Environment, Health and Welfare Research Center, Korea Institute of Science and Technology, Seoul, Republic of Korea. He received his Ph.D. in Mechanical Engineering from Hanyang University, Republic of Korea, in 2018. His research interests include aerosol technology and aerosol environment. Now he is working at Engine Research Laboratory, Korea Institute of Machinery and Materials, Republic of Korea.
Jae-In Lee is a researcher supported by Ministry of Science and Technology, Information and Communication with a project to train masters and Ph.Ds. for small and medium businesses at the Korea Institute of Science and Technology, Republic of Korea. He received his M.S. in Department of Environment from Kangwon National University, Republic of Korea, in 2017. His research interests include mass transfer of air pollutants.
Jong Bum Kim is a Senior Researcher of the ChungNam Institute, Chungcheongnamdo, Republic of Korea. He received his Ph.D. in Environmental Science from Korea University, Republic of Korea, in 2016. His research interests include exposure assessment of indoor environment, and ambient environment.
Gwi-Nam Bae is a Principal Research Scientist at the Korea Institute of Science and Technology, Republic of Korea. He received his Ph.D. in Mechanical Engineering from Korea Advanced Institute of Science and Technology. His research interests include characterization and control technologies of aerosols and bioaerosols for protecting human health from ambient and indoor air pollution.
Seung-Bok Lee is a Senior Research Scientist at the Korea Institute of Science and Technology, Republic of Korea. He received his Ph.D. from School of Mechanical and Aerospace Engineering, Seoul National University, Republic of Korea, in 2007. His research interests include aerosol technology and air quality.
Se-** Yook is currently an Associate Professor at the School of Mechanical Engineering, Hanyang University, Republic of Korea. He received his Ph.D. from the Department of Mechanical Engineering, University of Minnesota, USA, in 2007. His research interests include heat transfer and aerosol technology.
Youhwan Shin is a Principal Research Scientist at the Korea Institute of Science and Technology, Republic of Korea. He received his Ph.D. from the Department of Mechanical Engineering, Hanyang University, in 1998. His research interests include heat and fluid control, and energy storage.
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Woo, SH., Lee, JI., Kim, J.B. et al. Characteristics of dust-collection efficiency and ozone emission by high-voltage electrode shape of electrostatic precipitator for subway tunnel environment. J Mech Sci Technol 34, 1351–1363 (2020). https://doi.org/10.1007/s12206-020-0233-1
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DOI: https://doi.org/10.1007/s12206-020-0233-1