Corona discharging characteristics is of crucial significance to particle charging and migration procedures in Electrostatic Precipitator (ESP). In this article, the effect of SO3 aerosol on discharging characteristics of ESP was investigated based on the results of experimental and numerical simulation method. The results showed that an increase in SO3 concentration and relative humidity of flue gas lead to larger number concentration and particle size. Particle number concentration increased from 2.34×107cm-3 to 4.49×107cm-3 while SO3 concentration increased from 17.5mg/m3 to 179.6mg/m3, which also resulted in an increase of median diameter from 0.08μm to 0.15μm. The corona current decreased by 78% compared with blank condition when SO3 concentration was 179.6mg/m3, and higher flue gas humidity further deteriorated the corona suppression phenomenon. Meanwhile, the particle size and number concentration were important reason for the decrease of corona current. Particle with the size of near 0.1μm had large number concentration, which induced a high space charge density, suppressing the electric field and ion concentration around the electrode and then lowering the corona current.
Kim H J, Han B, Kim Y J, et al. Characteristics of an electrostatic precipitator for submicron particles using non-metallic electrodes and collection plates[J]. Journal of Aerosol Science, 2010,41(11):987-997.
[7]
Wei W, Gu Z. Electrification of particulate entrained fluid flows-Mechanisms, applications, and numerical methodology[J]. Physics Reports, 2015,600:1-53.
[8]
Kaci M, Said H A, Laifaoui A, et al. Investigation on the corona discharge in blade-to-plane electrode configuration[J]. Brazilian Journal of Physics, 2015,45(6):643-655.
[9]
Wang X, Chang J, Xu C, et al. Electrical characteristics of electrostatic precipitator with a wet membrane-based collecting electrode[J]. Journal of Electrostatics, 2016,80:85-94.
[10]
J?drusik M, ?wierczok A. The correlation between corona current distribution and collection of fine particles in a laboratory-scale electrostatic precipitator[J]. Journal of Electrostatics, 2013,71(3):199-203.
Yan P, Zheng C, Zhu W, et al. An experimental study on the effects of temperature and pressure on negative corona discharge in high-temperature ESPs[J]. Applied Energy, 2016,164:28-35.
[13]
Riebel U, Radtke R, Loos R. An experimental investigation on corona quenching[J]. Journal of electrostatics, 2002,54(2):159-165.
[14]
Elmoursi A A, Castle G S P. The analysis of corona quenching in cylindrical precipitators using charge simulation[J]. IEEE transactions on industry applications, 1986,(1):80-85.
[15]
Abdel-Salam M. Influence of humidity on charge density and electric field in electrostatic precipitators[J]. Journal of Physics D:Applied Physics, 1992,25(9):1318.
[16]
Peek F W. Dielectric phenomena in high voltage engineering[M]. McGraw-Hill Book Company, Incorporated, 1920.
[17]
White H J. Particle Charging in Electrostatic Precipitation[J]. Transactions of the American Institute of Electrical Engineers, 1951,70(2):1186-1191.
[18]
唐敏康.高压静电场中粉尘粒子的电气性能[M]. 化学工业出版社, 2010.
[19]
Zollner J H, Glasoe W A, Panta B, et al. Sulfuric acid nucleation:power dependencies, variation with relative humidity, and effect of bases[J]. Atmospheric Chemistry & Physics, 2012,12(10):4399-4411.
[20]
Vehkamäki H, Kulmala M, Lehtinen K E, et al. Modelling binary homogeneous nucleation of water-sulfuric acid vapours:parameterisation for high temperature emissions.[J]. Environmental Science & Technology, 2003,37(15):3392-8.
