| ELECTROSTATIC PHENOMENA IN GAS-SOLIDS FLUIDIZED BEDS |
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| 引用本文： | Hsiaotao T. Bi. ELECTROSTATIC PHENOMENA IN GAS-SOLIDS FLUIDIZED BEDS[J]. 中国颗粒学报, 2005, 3(6): 395-399 |
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| 作者姓名： | Hsiaotao T. Bi |
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| 作者单位： | Fluidization Research Centre, Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, Canada |
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| 摘 要： | 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.
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| 关 键 词： | 静电学现象 静电屏蔽 液-固传送线 流动床 电荷密度 |
| 收稿时间： | 2005-09-30 |
| 修稿时间： | 2005-09-302005-11-10 |
ELECTROSTATIC PHENOMENA IN GAS-SOLIDS FLUIDIZED BEDS |
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| Hsiaotao;T.;Bi. ELECTROSTATIC PHENOMENA IN GAS-SOLIDS FLUIDIZED BEDS[J]. China Particuology, 2005, 3(6): 395-399 |
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| Authors: | Hsiaotao T. Bi |
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| 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. |
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| Keywords: | electrostatics charge generation charge dissipation charge segregation gas-solids flow fluidization |
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