NONLINEAR ANALYSIS OF GAS-SOLID FLOW BEHAVIOR IN FAST FLUIDIZED BED RISER

LI Xiaoxiang; SHI Yanfu; HUANG Weixing; YU Huarui; ZHU Jingxu

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NONLINEAR ANALYSIS OF GAS-SOLID FLOW BEHAVIOR IN FAST FLUIDIZED BED RISER

更新时间：2025-12-10

- NONLINEAR ANALYSIS OF GAS-SOLID FLOW BEHAVIOR IN FAST FLUIDIZED BED RISER
- CIESC Journal Issue 2, Pages: 182-188(2004)
- 作者机构：
  
  1. 四川大学化工学院,四川,成都,610065
  2. 西安大略大学化工系,伦敦,加拿大,N6A 5B9
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 February 2004，
  
  Published：25 February 2004
- 稿件说明：
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LI Xiaoxiang, SHI Yanfu, HUANG Weixing, et al. NONLINEAR ANALYSIS OF GAS-SOLID FLOW BEHAVIOR IN FAST FLUIDIZED BED RISER[J]. CIESC Journal, 2004, (2): 182-188.
DOI：

LI Xiaoxiang, SHI Yanfu, HUANG Weixing, et al. NONLINEAR ANALYSIS OF GAS-SOLID FLOW BEHAVIOR IN FAST FLUIDIZED BED RISER[J]. CIESC Journal, 2004, (2): 182-188. DOI：

摘要

对φ100mm×16m、FCC固体颗粒的快速流化床提升管内环-核流动区局部颗粒含量脉动行为进行了非线性分析，用Kolmogorov熵表征了其气固流动行为.结果表明，Kolmogorov熵沿提升管环-核流动区径向有3个显著变化区域，以此为依据将提升管环-核流动区的气固流动行为沿径向分成3个流域：单颗粒随机运动控制的核心流域；单颗粒混沌控制的过渡流域；边壁控制的环形流域.同时，从颗粒对垂直气固流动系统中气固湍动程度影响的角度，解释了Kolmogorov熵的径向分布特征及其与流动结构的关系.

Abstract

A fast fluidized bed riser with 16m height and 0.10m ID was operated with FCC particles and in a wide range of operating conditions.The superficial gas velocity Ug ranged from 3.5m8226;s-1 to 8.1m8226;s-1

and the solids circulating rate Gs was from 50kg8226;m-28226;s-1 to 201kg8226;m-28226;s-1.Time series signals of solids holdup fluctuation were measured at a frequency of 900Hz using an optical fiber located at 8 axial and 11 radial positions.The nonlinear method was used to analyze the time series and consequently Kolmogorov entropy was calculated to describe the dynamic characteristics of the gas-solid flow behavior in the annular-core section. The results showed that Kolmogorov entropy could describe the annular-core flow structure. According to three marked characteristics of Kolmogorov entropy in the radial direction

three flow regions were identified：random-particles-controlled core region

chaotic-particles-controlled transitional region

wall-controlled annulus region.The change of Kolmogorov entropy in the radial direction was also interpreted based on the influence of solids on gas turbulence structures.

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