Particle transport and charging mechanism of the nano particle within an electrostatic precipitator

doi:10.7523/j.issn.2095-6134.2021.03.002

Abstract

Abstract: Based on the Ansys Fluent platform along with its secondary development programs, this research developed a comprehensive numerical model for nano particle migration within an electrostatic precipitator (ESP). The multi-field model coupled sub-models such as flow field, electric field, particle charging, and particle motion. The moving and charging behavior of nano particles in the ESP are fully discussed. The results show that both the amount and the direction of the body force on the particles will change periodically before collecting or escaping. The deposition efficiency curve of the nano particle presents the U-shape which is different from that of the micron particle. It proved that it is resulted from the changes of the main type and magnitude of the body force on the particle. Moreover, the charging mechanism of nano particles will also change. The charge is closely related to the particle size and particle concentration, directly affecting the Coulomb force on particles and corona discharge, which may lead to corona obstruction and seriously lower the particle deposition efficiency.

Key words: electrostatic precipitator (ESP), nano particle, particle motion, particle charge, numerical simulation

CLC Number:

TK123

FENG Yuxuan, LUO Kun, FAN Jianren. Particle transport and charging mechanism of the nano particle within an electrostatic precipitator[J]. Journal of University of Chinese Academy of Sciences, 2021, 38(3): 297-305.

References

[1] Weichenthal S, Dufresne A, Infante-Rivard C, et al. Indoor ultrafine particles and childhood asthma:exploring a potential public health concern[J]. Indoor Air, 2007, 17(2):81-91.
[2] 董雪玲. 大气可吸入颗粒物对环境和人体健康的危害[J]. 资源·产业, 2004, 6(5):50-53.
[3] 陶燕, 刘亚梦, 米生权, 等. 大气细颗粒物的污染特征及对人体健康的影响[J]. 环境科学学报, 2014, 34(3):592-597.
[4] Oberdörster G, Ferin J, Gelein R, et al. Role of the alveolar macrophage in lung injury:studies with ultrafine particles[J]. Environ Health Perspect, 1992,97:193-199.
[5] Donaldson K, Li X Y, Macnee W. Ultrafine (nanometre) particle mediated lung injury[J]. Journal of Aerosol Science, 1998, 29(5/6):553-560.
[6] While H J. Industrial Electrostatic Precipitation[M]. New York:Addison-Wesley,1963.
[7] Saradari P T, Rahimzadeh H, Ahmadi G, et al. Nano-particle deposition in the presence of electric field[J]. Journal of Aerosol Science, 2018, 126:169-179.
[8] Li A, Ahmadi G. Dispersion and deposition of spherical particles from point sources in a turbulent channel flow[J]. Aerosol Science and Technology, 1992, 16(4):209-226.
[9] 毕文剑, 李艳, 罗坤, 等. 温度对静电除尘器内颗粒受力影响的数值模拟[J].中国科学院大学学报,2017,34(2):172-178.
[10] Huang S H, Chen C C. Ultrafine aerosol penetration through electrostatic precipitators[J]. Environmental Science & Technology, 2002, 36(21):4625-4632.
[11] Lin G Y, Tsai C J. Numerical modeling of nanoparticle collection efficiency of single-stage wire-in-plate electrostatic precipitators[J]. Aerosol Science and Technology, 2010, 44(12):1122-1130.
[12] Lawless P A, Sparks L E. Modeling particulate charging in ESPs[J]. IEEE Transactions on Industry Applications, 1988, 24(5):922-927.
[13] Li Y, Zheng C H, Luo K, et al. CFD simulation of high-temperature effect on EHD characteristics in a wire-plate electrostatic precipitator[J]. Chinese Journal of Chemical Engineering, 2015, 23(4):633-640.
[14] Long Z W, Yao Q. Numerical simulation of the flow and the collection mechanism inside a scale hybrid particulate collector[J]. Powder Technology, 2012, 215/216:26-37.
[15] Luo K, Li Y, Zheng C H, et al. Numerical simulation of temperature effect on particles behavior via electrostatic precipitators[J]. Applied Thermal Engineering, 2015, 88:127-139.
[16] Yoo K H, Lee J S, Oh M D. Charging and collection of submicron particles in two-stage parallel-plate electrostatic precipitators[J]. Aerosol Science and Technology, 1997, 27(3):308-323.
[17] Zhuang Y, Kim Y J, Lee T G, et al. Experimental and theoretical studies of ultra-fine particle behavior in electrostatic precipitators[J]. Journal of Electrostatics, 2000, 48(3/4):245-260.