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Research Papers: Flows in Complex Systems

Influence of Applied Magnetic Field on a Wire-Plate Electrostatic Precipitators Under Multi-Field Coupling

[+] Author and Article Information
Jian-Ping Zhang

e-mail: jpzhanglzu@163.com

Jian-Xing Ren, Quan-Fei Ding

School of Energy and Mechanical Engineering,
Shanghai University of Electric Power,
Shanghai 200090, China

Helen Wu

School of Computing,
Engineering and Mathematics,
University of Western Sydney,
Penrith, NSW 2751, Australia

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 10, 2012; final manuscript received April 5, 2013; published online June 5, 2013. Assoc. Editor: Shizhi Qian.

J. Fluids Eng 135(8), 081105 (Jun 05, 2013) (8 pages) Paper No: FE-12-1436; doi: 10.1115/1.4024197 History: Received September 10, 2012; Revised April 05, 2013

The aim of this work is to find an effective method to improve the collection efficiency of electrostatic precipitators (ESPs). A mathematic model of an ESP subjected to the external magnetic field was proposed. The model considered the coupled effects between the gas flow field, particle dynamic field and electromagnetic field. Particles following a Rosin-Rammler distribution were simulated under various conditions and the influence of the magnetic field density on the capture of fine particles was investigated. The collection efficiency and the escaped particle size distribution under different applied magnetic field intensities were discussed. Particle trajectories inside the ESP under aerodynamic and electromagnetic forces were also analyzed. Numerical results indicate that the collection efficiency increases with the increase of applied magnetic field. It was also found that a stronger applied magnetic field results in a larger particle deflection towards the dust collection plates. Furthermore, the average diameter of escaping particles decreases and the dispersion of dust particles with different sizes increases with the increasingly applied magnetic field. Finally, the average diameter decreases almost linearly with the magnetic field until it drops to a certain value. The model proposed in this work is able to obtain important information on the particle collection phenomena inside an industrial ESP under the applied magnetic field.

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Figures

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Fig. 3

Two-dimensional computational model of a three-wire plate ESP

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Fig. 2

Schematic diagram of multifield coupling inside an ESP

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Fig. 1

Schematic drawing of mechanism analysis on a wire-plate ESP under external magnetic field

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Fig. 4

Flow chart for the numerical calculation

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Fig. 9

Collection efficiency versus the operating voltage under different applied magnetic field intensities (u = 0.7 m/s)

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Fig. 10

Average diameter of escaping particles versus the operating voltage under different applied magnetic field intensities (u = 0.7 m/s)

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Fig. 11

Statistical histogram of incident particles and trapped particles at u = 0.7 m/s: (a) B = 0.0 T, (b) B = 1.0 T, (c) B = 2.0 T, (d) B = 4.0 T

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Fig. 5

Computational mesh of the wire-plate ESP model

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Fig. 6

Comparison of the predicted potential distribution with the experimental data in Ref. [22]: (a) from the plate to the midpoint between wires and (b) from the plate to the wire along the wire-plate line

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Fig. 7

Particle tracks under different applied magnetic field intensities (V0 = 46.2 kV, u = 0.7 m/s): (a) B = 0.0 T, (b) B = 1.0 T, (c) B = 3.0 T, (d) B = 4.0 T

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Fig. 8

Average diameter of escaping particles versus applied magnetic field intensity (V0 = 46.2 kV, u = 0.7 m/s)

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