Electrostatic phenomena in gas-solids fluidized beds--颗粒学报PARTICUOLOGY

Bi, H. T. (2005). Electrostatic phenomena in gas-solids fluidized beds. China Particuology, 3(6), 395-399. https://doi.org/10.1016/S1672-2515(07)60220-6

Electrostatic phenomena in gas-solids fluidized beds

Hsiaotao T. Bi ^*

Fluidization Research Centre, Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, Canada

10.1016/S1672-2515(07)60220-6

Volume 3, Issue 6, December 2005, Pages 395-399

Received 30 September 2004, Accepted 10 November 2004, Available online 27 November 2007.

E-mail: xbi@chml.ubc.ca

Highlights

Abstract

Electrostatic charges are generated by particle-wall, particle-particle and particle-gas contacts in gas-solids transport lines and fluidized bed reactors. High particle charge densities can lead to particle agglomeration, particle segregation, fouling of reactor walls and internals, leading to undesirable by-product and premature shut-down of processing equipment. In this paper, the charge generation, dissipation and segregation mechanisms are examined based on literature data and recent experimental findings in our laboratory. The particle-wall contact charging is found to be the dominant charge generation mechanism for gas-solids pneumatic transport lines, while bipolar charging due to intimate particle-particle contact is believed to be the dominant charge generation mechanism in gas fluidized beds. Such a bipolar charging mechanism is also supported by the segregation patterns of charged particles in fluidized beds in which highly charged particles tend to concentrate in the bubble wake and drift region behind rising bubbles.

Graphical abstract

Keywords

electrostatics; charge generation; charge dissipation; charge segregation; gas-solids flow; fluidization

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