Bed expansion and fluidized states change of Geldart-B particle gas-solid fluidized bed

MA Wangyu; LUO Zhenghong

doi:10.11949/0438-1157.20190013

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Bed expansion and fluidized states change of Geldart-B particle gas-solid fluidized bed

Fluid dynamics and transport phenomena | 更新时间：2026-07-24

- Bed expansion and fluidized states change of Geldart-B particle gas-solid fluidized bed
- CIESC Journal Vol. 70, Issue 7, Pages: 2472-2479(2019)
- 作者机构：
  
  上海交通大学化学化工学院化学工程系，金属基复合材料国家重点实验室，上海 200240
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190013
  CLC： O 359
- Received：04 January 2019，
  
  Revised：2019-04-15，
  
  Online First：24 July 2026，
  
  Published：05 July 2019
- 稿件说明：
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马旺宇, 罗正鸿. Geldart-B类颗粒在气固流化床中的床层膨胀与流型转变[J]. 化工学报, 2019, 70(7): 2472-2479

MA Wangyu, LUO Zhenghong. Bed expansion and fluidized states change of Geldart-B particle gas-solid fluidized bed[J]. CIESC Journal, 2019, 70(7): 2472-2479
马旺宇, 罗正鸿. Geldart-B类颗粒在气固流化床中的床层膨胀与流型转变[J]. 化工学报, 2019, 70(7): 2472-2479 DOI： 10.11949/0438-1157.20190013.

MA Wangyu, LUO Zhenghong. Bed expansion and fluidized states change of Geldart-B particle gas-solid fluidized bed[J]. CIESC Journal, 2019, 70(7): 2472-2479 DOI： 10.11949/0438-1157.20190013.

摘要

采用理论推导和经验公式相结合方法，建立了Geldart-B类颗粒在流化床中流化过程的床层膨胀比(

)的通式，并在全取值范围内构建了床层膨胀比的收敛迭代公式。采用不同颗粒的流化实验数据对

上述通式(模型)进行了验证，结果表明该模型很好地预测了床层膨胀比。进一步讨论了床层膨胀比与鼓泡流化流型变化之间的关系，给出了临界膨胀比的取值规律。有关床层膨胀比的研究结果一定程度上可有效改善流化床的监控，优化操作条件选取。

Abstract

Based on the combination of theoretical derivation and empirical formula

the general formula of the bed expansion ratio of fluidized process of Geldart-B particles in fluidized bed is established

and the convergence iteration formula of bed expansion ratio is constructed in the whole value range. The formula has divergence when the initial bed height is small or the gas velocity is large and is not always available. Bed expansion ratio iteration formulas that converge across the full range of values are constructed by introducing power series and numerical processing. The calculation results are closed to the experimental data of silica

Diakon and a small Geldart-B particles. The relationship between bed expansion ratio and bubbling fluidized flow regimes is further discussed. At the critical point of the flow regime transitions

the critical expansion ratio can be obtained from particle properties and bed structure parameters. The main factors affecting bed expansion ratio can be divided into three aspects: operating conditions

particle properties and bed structure. It is difficult for the bed to expand when the Archimedes number of particles is large

the initial bed height is high and the bed diameter is small.

关键词

Keywords

references

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