大颗粒流化床动力学相似性研究  

Hydrodynamic similarity for fluidized beds with coarse particle

作　　者：杨欣[1] 范海宏[1] 李晓光[1] 

机构地区：[1]西安建筑科技大学材料学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2006年第6期819-822,838,共5页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50432040)

摘　　要：为获得大颗粒流化床放大的理论依据及工业大颗粒流化床内部的动力学信息,在前人的相似性研究基础上,以两相流理论为基础对已有流化床动力学相似条件进行简化,获得了大颗粒流化床的动力学相似条件,该相似条件包含6个无量纲参数,即傅鲁德数、表观风速与临界流化风速的比值、静床高和床径的比值、固气密度比、颗粒球形度和颗粒粒径分布参数.经实验验证该相似条件是正确的,可以用于指导大颗粒流化床模型的放大.Hydrodynamic similarity for fluidized beds with coarse particle is studied in this thesis so as to acquire the theoretical basis for the scale-up of fluidized beds and the hydrodynamic information in fluidized beds. The scaling relationships governing hydrodynamic behaviors in fluidized beds were developed on the basic of the gas-solid two-phase theory and the similarity principle including the Froude number, the ratio of superficial gas velocity to minimum fluidization velocity, the ratio of static height of bed to diameter of bed, the solid-to-gas density ratios, the sphericity of particle and the particle size distribution. The theory of similarity is proved correct by experiments and can guide the amplification of flu idization beds.

关 键 词：大颗粒 流化床 相似条件 无量纲参数 

分 类 号：TQ051.1[化学工程]