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.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
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)
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
fast fluidization
choking velocity
type A choking
type C choking
separate phase coexistence model
