Effect of Secondary Flows on the Particle Collection Efficiency in Single Stage Electrostatic Precipitator

Title & Authors
Effect of Secondary Flows on the Particle Collection Efficiency in Single Stage Electrostatic Precipitator
Lee, Jae-Bok; Bae, Gwi-Nam; Hwang, Jung-Ho;

Abstract
The ionic wind formed in a nonuniform electric field has been recognized to have a significant effect on particle collection in an electrostatic precipitator(ESP). Under normal operating conditions the effect of ionic wind is not pronounced. However, as the flow velocity becomes smaller, the ionic wind becomes pronounced and induces secondary flow, which has a significant influence on the flow field and the particle collecting efficiency. In this paper, experiments for investigating the effect of secondary flow on collection efficiencies were carried out by changing the flow velocities in 0.2-0.7m/s and the applied voltages in 9-11kV/cm. The particle size distributions and concentrations are measured by DMA and CNC. To analyze the experimental results, numerical analysis of electric filed in ESP was carried out. It shows that particle collection is influenced by two independent dimensionless numbers, $\small{Re_{ehd}\;and\;Re_{flow}}$ not by $\small{N_{ehd}}$ alone. When $\small{Re_{flow}}$, decreases for constant $\small{Re_{ehd}}$, the secondary flow prohibits the particle collection. But when $\small{Re_{ehd}}$ increases for constant $\small{Re_{flow}}$, it enhances the particle collection by driving the particles into the collection region.
Keywords
Electrostatic Precipitator(ESP);Secondary Flow;Particle Collection Efficiency;Corona Discharge;Electric Field Intensity;
Language
Korean
Cited by
1.
분무 및 코로나 방전에 의해 대전된 서브마이크론 입자의 대전량 분포,이재복;배귀남;황정호;이규원;

대한기계학회논문집B, 2001. vol.25. 1, pp.124-132
References
1.
Clements, J. S., A, Mizuno, A., Finney, W. C., and Davis, R. H., 1989, 'Combined Removal of \$SO_2\$, \$NO_x\$, and Fly Ash from Simulated Flue Gas Using Pulsed Streamer Corona,' IEEE Trans. Ind. Applications, Vol. 25, pp. 62-69

2.
Robinson, M., 1976, ERDA, Health & Safety Lab. Rep. HASL-301

3.
Yabe, A., Mori, Y. and Hijikata, K., 1978, 'EHD Study of The Corona Wind between Wire and Plate Electrodes,' AIAA J., Vol. 16, pp. 340-345

4.
Yamamoto, T. and Velkoff, H. R., 1981, 'Electrohydrodynamics in an Electrostatic Precipitator,' J. Fluid Mech., Vol. 108, pp. 1-18

5.
Leonard, G. L., Michner, M. and Self, S. A., 1980, 'Experimental Study of the Effect of Turbulent Diffusion on Precipitation Efficiency,' J. Aerosol Sci., Vol. 13, pp. 271-284

6.
Kallio, G. A. and Stock, D. E., 1992, 'Interaction of Electrostatic and Fluid Dynamic Fields in Wire-Plate Electrostatic Precipitator,' J. Fluid Mech., Vol. 240, pp. 133-166

7.
Goo, J. H. and Lee, J. W., 1997, 'Stochastic Simulation of Particle Charging and Collection Characteristics for a Wire-Plate Electrostatic Precipitator of Short Length,' J. Aerosol Sci., Vol. 28, pp. 875-893

8.
정상현, 김상수, 1994, '1단 전기집진기에서 난류확산과 2차 유동이 입자의 농도분포에 미치는 영향,' 94년 열 및 유체공학 부문 학술대회 논문집, pp. 8-15

9.
Choudhary, K. R. and Gentry, J. W., 1974, 'Particle Collection Efficiency of a Bench Scale Electrostatic Precipitator in the Field Charging Region as a Function of Particle Size,' J. Colloid and Interface Sci. Vol. 48, pp. 263-280

10.
McCain, J. D., Gooch, J. P. and Smith, W. B., 1975, 'Results of Field Measurements of Industrial Particulate Sources and Electrostatic Precipitator Performance,' J. Air Pollution Control. Assoc., Vol. 25, pp. 117-121

11.
Ylatalo, S. I., Kauppinen, E. I., Hautanen, J., Joutsensaari, J., Ahonen, P., Lind, T. M., Jokiniemi, J. K. and Kipelainen, M., 1992, 'On the Determination of Electrostatic Precipitator Efficiency by Differential Mobility Analyzer,' J. Aerosol Sci., Vol. 23, pp. s795-s798

12.
Yoo, K. H., Lee, J. S. and Oh., M. D., 1997, 'Charging and Collection of Submicron Particles in Two Stage Parallel Plate Electrostatic Precipitator,' J. Aerosol Sci., Vol. 27, pp. 308-323

13.
Liang, W. J. and Lin, T. H., 1994, 'The Characteristics of Ionic Wind and Its Effect on Electrostatic Precipitators,' Aerosol Sci. Technol., Vol. 20, pp. 330-344

14.
MacDonald, J. R., Smith, W. B. and Spencer, H. W., 1977, 'A Mathematical Model for Calculating Electrical Conditions in Wire Duct Electrostatic Precipitation Device,' J. Appl. Phys., Vol. 48, pp. 2231-2243

15.
Okazaki, K. and Willeke, K., 1987, 'Transmission and Deposition Behavior of Aerosols in Sampling Inlets,' Aerosol Sci. Technol., Vol. 7, 275-283

16.
Oglesby, S. and Nichols, G. B., 1978, Electrostatic Precipitation, pp. 44-45, Marcel Dekker