Two-phase flow and mass transfer characteristics of fluidized bed with narrow-slit opening grid internals

NAN Rui; ZHENG Ziyu; LV Wenhao; LI Leyan; FAN Yiping; LU Chunxi

doi:10.11949/0438-1157.20260673

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Two-phase flow and mass transfer characteristics of fluidized bed with narrow-slit opening grid internals

更新时间：2026-08-04

- Two-phase flow and mass transfer characteristics of fluidized bed with narrow-slit opening grid internals
- CIESC Journal (2026)
- 作者机构：
  
  中国石油大学（北京）重质油全国重点实验室，北京 102249
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260673
  CLC：
- Received：15 May 2026，
  
  Revised：2026-08-01，
  
  Accepted：04 August 2026，
- 稿件说明：
移动端阅览
NAN Rui, ZHENG Ziyu, LV Wenhao, et al. Two-phase flow and mass transfer characteristics of fluidized bed with narrow-slit opening grid internals[J/OL]. CIESC Journal, 2026.
DOI：

NAN Rui, ZHENG Ziyu, LV Wenhao, et al. Two-phase flow and mass transfer characteristics of fluidized bed with narrow-slit opening grid internals[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260673.

摘要

通过大型冷模实验，考察了不同表观气速、不同细粉比例条件下，一种狭长开孔格栅内构件汽提器内两相流动特性与传质性能。结果表明：随细粉比例增加，床内两相流场发展演化进程显著加快；高细粉比例颗粒体系历经“近自由床区-格栅强化区-近自由床区”的完整演化过程，低细粉颗粒体系则历经部分过程，“格栅强化区”并未消失。汽提器最佳操作气速区间为0.127~0.212m/s；高细粉比例颗粒体系甚至在表观气速

=0.127m/s的低气速工况下，即可达到97.0%的汽提效率。采用局部流动参数气泡频率和气泡时间占比与汽提效率关联；并提出了新参数“气固匹配特征指数”，该参数能够较为准确地反映汽提效率随气速的变化。结合局部流动参数的分布特点，提出了汽提内构件的改进方案。

Abstract

Fluidized beds with internals are widely used in the catalyst stripping process of high-temperature short-contact time processes such as fluid catalytic cracking(FCC) and methanol to olefins(MTO). The stripping efficiency of the stripper directly influence the product yield and distribution. A large-scale cold-model experiment was conducted to investigate the two-phase flow ch

aracteristics and the mass transfer performance of a stripper equipped with narrow-slit opening grid internals under varying superficial gas velocities and fine particle fractions. The results show that the evolution process of the two-phase flow field in the bed accelerates significantly with an increasing in fine particle fraction. The particle system with a high fine fraction undergoes the full evolution process of the pseudo free bubbling bed regime – the grid-influenced regime – the pseudo free bubbling bed regime

while the low fine fraction system only experiences parts of evolution process

and the "the grid influenced regime" does not disappear. The optimal superficial gas velocity is determined to be 0.127~0.212 m/s; and the high fine fraction system can achieve a stripping efficiency of 97% even under a low superficial gas velocity of

=0.127 m/s. Correlation analysis was performed between those local flow parameters (bubble frequency and bubble time fraction) and the stripping efficiency. A new parameter named by the gas-solid matching characteristic index

was proposed

which can accurately reflect the variation of stripping efficiency with gas velocity. Combined with the distribution characteristics of local flow parameters

an optimization scheme for the stripping internals was put forward.

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