CFD simulation of high-temperature effect on EHD characteristics in a wire-plate electrostatic precipitator

doi:10.1016/j.cjche.2014.06.038

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (4): 633-640.DOI: 10.1016/j.cjche.2014.06.038

CFD simulation of high-temperature effect on EHD characteristics in a wire-plate electrostatic precipitator

Yan Li, Chenghang Zheng, Kun Luo, Xiang Gao, Jianren Fan, Kefa Cen

State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou 310027, China

收稿日期:2013-12-03 修回日期:2014-06-04 出版日期:2015-04-28 发布日期:2015-05-13
通讯作者: Kun Luo
基金资助:
Supported by the National Natural Science Foundation of China (51176170,51390490,51125025) and the Natural Science Foundation of Zhejiang Province (LR12E06001).This work is also partially supported by the Fundamental Research Funds for the Central Universities.

CFD simulation of high-temperature effect on EHD characteristics in a wire-plate electrostatic precipitator

Yan Li, Chenghang Zheng, Kun Luo, Xiang Gao, Jianren Fan, Kefa Cen

State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou 310027, China

Received:2013-12-03 Revised:2014-06-04 Online:2015-04-28 Published:2015-05-13
Contact: Kun Luo
Supported by:
Supported by the National Natural Science Foundation of China (51176170,51390490,51125025) and the Natural Science Foundation of Zhejiang Province (LR12E06001).This work is also partially supported by the Fundamental Research Funds for the Central Universities.

摘要/Abstract

摘要： A computational fluid dynamics (CFD) model is carried out to describe the wire-plate electrostatic precipitator (ESP) in high temperature conditions, aiming to study the effects of high temperature on the electro- hydrodynamic (EHD) characteristics. In the model, the complex interactions at high temperatures between the electric field, fluid dynamics and the particulate flow are taken into account. We apply different numerical methods for different fields, including an electric field model, Euler-Lagrange particle-laden flows model, and particle charging model. The effects of high temperature on ionic wind, EHD characteristics and collection efficiency are investigated. The numerical results show high temperature causes more significant effects of the ionic wind on the gas secondary flow. High viscosity of gas at high temperature makes particles follow the gas flow pattern more closely. High temperature reduces the surface electric strength, so that the mean electric strength weakens the space charging. On the contrary, there is an increase in the diffusion charging at high temperature compared with at low temperature. High temperature increases the ratio of mean drag force over mean electrostatic force acting on the particles which may contribute to a decline of collection efficiency.

关键词: Electro-hydrodynamic, Electrostatic precipitation, High temperature, Ionic wind

Abstract: A computational fluid dynamics (CFD) model is carried out to describe the wire-plate electrostatic precipitator (ESP) in high temperature conditions, aiming to study the effects of high temperature on the electro- hydrodynamic (EHD) characteristics. In the model, the complex interactions at high temperatures between the electric field, fluid dynamics and the particulate flow are taken into account. We apply different numerical methods for different fields, including an electric field model, Euler-Lagrange particle-laden flows model, and particle charging model. The effects of high temperature on ionic wind, EHD characteristics and collection efficiency are investigated. The numerical results show high temperature causes more significant effects of the ionic wind on the gas secondary flow. High viscosity of gas at high temperature makes particles follow the gas flow pattern more closely. High temperature reduces the surface electric strength, so that the mean electric strength weakens the space charging. On the contrary, there is an increase in the diffusion charging at high temperature compared with at low temperature. High temperature increases the ratio of mean drag force over mean electrostatic force acting on the particles which may contribute to a decline of collection efficiency.

Key words: Electro-hydrodynamic, Electrostatic precipitation, High temperature, Ionic wind

Yan Li, Chenghang Zheng, Kun Luo, Xiang Gao, Jianren Fan, Kefa Cen. 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.

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CFD simulation of high-temperature effect on EHD characteristics in a wire-plate electrostatic precipitator

CFD simulation of high-temperature effect on EHD characteristics in a wire-plate electrostatic precipitator

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