快速床动力学统一模型Ⅱ:上部稀相与下部浓相固含率的预报  

A Unified Model for Fast Fluidization Dynamics—PartⅡ:Prediction of Upside Dilute Phase Holdup and Lower Dense Phase Holdup

作　　者：张楚[1] 林郁郁[1] 章明川[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《工程热物理学报》2012年第4期694-698,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：在前文建立的分相共存快速床动力学模型的基础上,对分相模型中存在颗粒团聚物时的上升稀相进行了受力分析。以有限直径提升管中颗粒终端速度的修正,导出了上升稀相受力关于等效管径与浓稀相滑移速度的修正表达式。将本模型预报的上部稀相固含率与已有的实验数据经验关联式进行了对比,并根据所得结果初步优化了模型参数(k=8,n=6)。进而,根据所得模型参数计算了下部浓相固含率随曳力函数f(ε)的变化规律;与李佑楚经验关联式相比,同样具有合理的一致性。本文工作进一步验证了快速床动力学统一模型的整体合理性。Based on the separate phase coexistence model for fast fluidization proposed previously, force analysis of the upside dilute phase with particle clusters was performed first.The expression of the force acting on the upside dilute phase about the equivalent diameter and two-phase slip velocity was derived through the amendment,of the particle terminal velocity in a limited diameter riser.The upside dilute phase solid holdup predicted were compared with the empirical formulae in literatures, and the model parameters were preliminary optimized according to the results（k=8,n=6）.Variation of the lower dense phase solid holdup with the drag function was also calculated and compared with Li＇s formula,showing general consistency with the latter.This work verified further the overall rationality of the unified fast fluidization dynamic model developed.

关 键 词：快速流态化 分相共存模型 等效管径 上部稀相固含率 下部浓相固含率 

分 类 号：TQ021[化学工程]