快速床动力学统一模型—由A型噎塞向C型噎塞的连续转变Ⅰ:模型构建  

A Unified Model for Fast Fluidization Dynamics—Continuous Transforming From Type a Choking to Type C Choking PartⅠ:Model Establishment

作　　者：章明川[1] 张楚[1] 林郁郁[1] 徐旭常[2] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]清华大学热能工程系,北京100084

出　　处：《工程热物理学报》2011年第5期895-899,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50676062)

摘　　要：根据快速流化床的基本流动特性、A型噎塞和C型噎塞的特征与定义,建立了一个统一、自恰的快速床模型分相共存模型。模型以A型噎塞的修正Yang公式为‘本构方程',合理预报了快速床的最小固体流率G_(sm),以及在固体流率不变的条件下降低操作气速时床层由A型噎塞向C型噎塞的连续过渡。模型中的稀相有效气流速度函数幂次n为可调参数,根据C型噎塞速度预报的Yousfi and Gau公式,初步确定模型参数n=4。Based on the basic nature of the fast fluidization,the characteristics and definitions of the type A choking and the type C choking,a unified and self-harmonistic model for fast fluidization dynamics,named the separate phase coexistence model,are proposed in this paper.By using the revised Yang＇s formula for type A choking as ＇constitutive equation＇,the minimal solid flux for fast fluidization G_（sm） was predicted reasonably.When the operation gas velocity decreased but keeping solid flux constant,the continuous transforming from the type A choking to the type C choking was realized successfully.The adjustable model parameter n was determined to be about 4 through the comparison between the C type choking velocities calculated by this model and those by Yousfi and Gau＇s formula.

关 键 词：快速流态化 噎塞速度 A型噎塞 C型噎塞 分相共存模型 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]