STUDY ON THE OVERALL PRESSURE BALANCE OF A DOWNFLOW CIRCULATING FLUIDIZED BED SYSTEM  

作　　者：Hengzhi Chen Dawei Yang Hongzhong Li Shiyu Tan 

机构地区：[1]College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, R R. China [2]Multiphase Reaction Laboratory, Institute of Process Engineering, Chinese Academy of Science, Beijing 100080, P.R. China

出　　处：《China Particuology》2006年第3期153-159,共7页

摘　　要：A pressure balance model for a circulating fluidized bed unit that incorporates a downer has been proposed. The model predictions were validated with the experimental data obtained from a special cold-model circulating fluidized bed. Comparison of the operation stability between a CFB downer and a CFB riser has been carried out. Only one critical gas velocity exists in the CFB-riser for a given riser solids flux, while there can be many critical gas velocities for the operation of a CFB downer. Therefore, it is possible to achieve high solids concentration in a CFB downer if appropriate operating conditions are used.A pressure balance model for a circulating fluidized bed unit that incorporates a downer has been proposed. The model predictions were validated with the experimental data obtained from a special cold-model circulating fluidized bed. Comparison of the operation stability between a CFB downer and a CFB riser has been carried out. Only one critical gas velocity exists in the CFB-riser for a given riser solids flux, while there can be many critical gas velocities for the operation of a CFB downer. Therefore, it is possible to achieve high solids concentration in a CFB downer if appropriate operating conditions are used.

关 键 词：circulating fluidized bed operation stability DOWNER RISER 

分 类 号：O643.1[理学—物理化学] O35[理学—化学]