快速流化床提升管中气固流动行为的非线性分析  

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

作　　者：李晓祥[1] 石炎福[1] 黄卫星[1] 余华瑞[1] 祝京旭[2] 

机构地区：[1]四川大学化工学院,四川成都610065 [2]西安大略大学化工系

出　　处：《化工学报》2004年第2期182-188,共7页CIESC Journal

基　　金：国家自然科学基金--海外青年基金资助项目(No 2 992 80 0 5 )~~

摘　　要：对10 0mm× 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 .A fast fluidized bed riser with 16 m height and 0.10 m ID was operated with FCC particles and in a wide range of operating conditions. The superficial gas velocity Ug ranged from 3.5 m&middots-1 to 8.1 m&middots-1, and the solids circulating rate Gs was from 50kg&middotm-2&middot-1 to 201 kg&middotm-2&middots-1. Time series signals of solids holdup fluctuation were measured at a frequency of 900 Hz 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.

关 键 词：快速流化床 提升管 颗粒含量 时间序列 非线性分析 

分 类 号：TQ051.1[化学工程]