Experimental and numerical cold-model study of internal heating and external circulation fluidized bed for particle coating

TIAN Yu; LAN Rui; LIU Rongzheng; YANG Xu; LIU Bing; SHAO Youlin; LIU Malin

doi:10.11949/0438-1157.20260985

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Experimental and numerical cold-model study of internal heating and external circulation fluidized bed for particle coating

更新时间：2026-08-28

- Experimental and numerical cold-model study of internal heating and external circulation fluidized bed for particle coating
- CIESC Journal (2026)
- 作者机构：
  
  清华大学核能与新能源技术研究院，北京 100084
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260985
  CLC： TQ 028.8
- Received：20 July 2026，
  
  Revised：2026-08-23，
  
  Accepted：28 August 2026，
- 稿件说明：
移动端阅览
TIAN Yu, LAN Rui, LIU Rongzheng, et al. Experimental and numerical cold-model study of internal heating and external circulation fluidized bed for particle coating[J/OL]. CIESC Journal, 2026.
DOI：

TIAN Yu, LAN Rui, LIU Rongzheng, et al. Experimental and numerical cold-model study of internal heating and external circulation fluidized bed for particle coating[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260985.

摘要

流化床-化学气相沉积（FB-CVD）颗粒包覆技术广泛应用于化工、环境和核能等领域。其中，颗粒循环、孔口沉积、局部热边界和包覆区停留时间分布之间的耦合，是制约反应器放大、运行和包覆一致性的主要因素。针对以上挑战，本研究提出新型内加热-外循环（Internal Heating-External Circulation

IH-EC）流化床包覆系统。首先搭建新型IH-EC流化床二维冷模实验装置，基于异色颗粒示踪方法和CFD-DEM模拟，详细考察中路-环路气速、床底锥角、底部间隙和中心加热体高度的影响规律，并提出FB-CVD过程新型综合评价指标。结果表明，IH-EC流化床可形成稳定的“中心上升-顶部扩散-环隙下降-底部回流”颗粒循环过程，并指出

c=7.5 m/s、

a=3.0 m/s、15°床底锥角、20 mm底部间隙和20 cm加热体高度构成本文颗粒物性和反应器条件下的最优参数组合。研究结果拓展了流态化学科研究范畴，也为内加热-外循环FB-CVD包覆反应器设计优化提供参考。

Abstract

Fluidized bed-chemical vapor deposition (FB-CVD) is widely used for particle coating in the chemical

environmental

and nuclear industries. However

the complex coupling among particle circulation

nozzle accretion

local thermal boundary conditions

and the residence-time distribution within the coating zone remains a major challenge affecting reactor scale-up

operational stability

and coating uniformity. To address these issues

a novel internally heated fluidized bed with external particle circulation was proposed. Quasi-two-dimensional cold-model experiments

differently colored particle tracing

and computational fluid dynamics–discrete element method (CFD-DEM) simulations were combined to establish a new comprehensive performance evaluation criterion for the fluidized bed. The effects of the central and annulus gas velocities

bed-bottom cone angle

bottom clearance

and central heating element height were systematically investigated. The results demonstrate that the proposed configuration can maintain a stable particle circulation pattern characterized by central upward transport

top spreading

annulus downward motion

and bottom return flow. Based on the experimental and numerical results

the optimal parameters for the particle properties and reactor conditions investigated were identified as a central gas velocity of 7.5 m/s

an annulus gas velocity of 3.0 m/s

a bed-bottom cone angle of 15°

a bottom clearance of 20 mm

and a central heating element height of 20 cm. These findings expand the scope of fluidization research

and provide a fundamental design reference for the optimization of newly proposed internally heated FB-CVD coating reactors with external particle circulation.

关键词

Keywords

references

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