摘要
根据在直径0.186 m、高8 m 和直径0.14 m、高12 m 两台快速流化床装置的实验结果,并综合文献研究报道,研究了操作气速、颗粒循环速率、颗粒物性、床层直径以及进口、出口结构等因素对床层截面平均空隙率轴向分布的影响。表明一般情况下,快速流化床截面平均空隙率轴向分布的基本形式是上部空隙率高、下部空隙率低的单调指数函数。在特定的床结构条件下,快速流化床截面平均空隙率轴向分布曲线可能发生变异,即在出口结构有强约束作用时,可能呈反C,在入口结构有弱约束作用时,可能呈 S 型。
Based on experiments from two fast fluidization columns(D=0.186 m× 8m and D=0.140m×12m)and the literature study,the effects of gas velocity,solids circulation rate,particle properties,bed diameter and solids inlet and exit structure on the axial cross-sectionally averaged voidage distri- bution in fast fluidized beds were studied.The axial average voidage distribution was fouud to have a basic profile described by the simple exponential function, with increasing voidage from the bottom to the top of the bed.With special bed structures,the basic axial average voidage distribution profile may change into a C shape with strong exit restrictions or,into a S shape with weak solids inlet restriction.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
1990年第1期63-71,共9页
Chemical Reaction Engineering and Technology
基金
国家自然科学基金
关键词
快速流化床
空隙率
床结构
轴向分布
Fast fluidized bed
Axial Voidage profile
Bed structure
