Journal
JOURNAL OF ELECTROSTATICS
Volume 62, Issue 4, Pages 291-308Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.elstat.2004.05.006
Keywords
electrostatic precipitator; electrode design; voltage-current characteristics; ionic wind; electrohydrodynamic; EHD simulation; spiked electrode
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The present electrode configuration and arrangement of the electrostatic precipitator (ESP) have been determined, based on experimental data from the laboratory scale ESP and operational experiences of the full-scale ESPs. However, there is a limitation to determine the optimal electrode design. As an alternate approach, the numerical simulation was investigated. A two-dimensional electrohydrodynamic (EHD) simulation for the wire electrode in the duct geometry was first carried out. Then, the experimental study and operational results of a full-scale ESP on the voltage-current characteristics were investigated. An applicable simulation model of electrical characteristics for the full-scale ESP was developed. Next, three-dimensional EHD simulation was carried out in order to understand the flow distribution for the typical industrial ESP geometry i.e. the spiked-type discharge electrode and convex-concave-type collecting electrode, in which the primary flow becomes three-dimensional due to ionic wind. The three-dimensional EHD simulation shows that the flow interaction due to ionic wind takes place at every spiked electrode region and a zig-zag motion is formed in the direction of the primary flow. The magnitude of the flow interaction is described by using dimensionless EHD number (N-EHD). The flow interaction in the typical ESP is not significantly large because the N-EHD of the full-scale ESP is usually less than 1.0. (C) 2004 Elsevier B.V. All rights reserved.
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