Particle-scale study on scale-up criteria for spout-fluidized beds: from geometric similarity to functional similarity

CHANG Qi; LIU Yujun; XU Ji; ZHANG Shiwei; AN Yanjun; WU Xin; GE Wei

doi:10.11949/0438-1157.20260468

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Particle-scale study on scale-up criteria for spout-fluidized beds: from geometric similarity to functional similarity

更新时间：2026-06-11

- Particle-scale study on scale-up criteria for spout-fluidized beds: from geometric similarity to functional similarity
- CIESC Journal (2026)
- 作者机构：
  
  1.介科学与过程工程全国重点实验室，中国科学院过程工程研究所，北京 100190
  2.中煤鄂尔多斯能源化工有限公司，鄂尔多斯 017300
  3.中国科学院大学化学工程学院，北京101408
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260468
  CLC： TQ018;TQ027.1
- Received：04 April 2026，
  
  Revised：2026-06-11，
  
  Accepted：11 June 2026，
- 稿件说明：
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CHANG Qi, LIU Yujun, XU Ji, et al. Particle-scale study on scale-up criteria for spout-fluidized beds: from geometric similarity to functional similarity[J/OL]. CIESC Journal, 2026.
DOI：

CHANG Qi, LIU Yujun, XU Ji, et al. Particle-scale study on scale-up criteria for spout-fluidized beds: from geometric similarity to functional similarity[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260468.

摘要

喷动流化床的工业放大长期受限于传统无量纲数相似准则的失效，其根源之一在于喷动偏斜等固有失稳行为破坏了宏观几何相似性。本文从颗粒尺度出发，应用CFD-DEM对放大前后的喷动流化床进行模拟研究，考察了中间、喷动和射流三种流型下基准床、严格与非严格相似放大等6种工况的颗粒运动与混合行为。结果表明，喷动偏斜可打乱分区以强化混合，补偿放大带来的混合性能损失；混合时间与有效循环时间呈线性相关，证实宏观循环主导了混合过程。基于此，本文建立了混合时间与有效循环时间之间的定量关系，提出以有效循环时间作为放大相似性判据，将放大目标从追求宏观形态的“几何相似”转向保证混合性能的“功能相似”。

Abstract

The industrial scale-up of spout-fluidized beds has long been hindered by the failure of traditional dimensionless group similarity criteria

partly due to inherent instabilities such as the spout deflection that break the geometric similarity. From the particle-scale perspective

CFD-DEM simulations are conducted for spout-fluidized beds before and after geometric scaling

investigating the particle motion and mixing behavior under six operating conditions (the base bed

the strictly similarity-scaled bed

and the non-strictly similarity-scaled bed) across three flow regimes: intermediate

spouting

and jet. The results reveal that spout deflection disrupts the three-zone structure and enhances mixing

compensating for the loss of mixing performance caused by scale-up. A linear correlation is observed between the mixing time and effective circulation time

confirming that the macro-circulation dominates the mixing process. Based on these findings

a quantitative relationship between the mixing time and effective circulation time is established

and the effective circulation time is proposed as a similarity criterion for scale-up

shifting the scale-up objective from pursuing the geometric similarity to ensuring the functional similarity in the mixing performance.

关键词

Keywords

references

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