Study on the overall pressure balance of a downflow circulating fluidized bed system--颗粒学报PARTICUOLOGY

Chen, H., Yang, D., Li, H., & Tan, S. (2006). Study on the overall pressure balance of a downflow circulating fluidized bed system. China Particuology, 4(3), 153–159. https://doi.org/10.1016/S1672-2515(07)60255-3

Study on the overall pressure balance of a downflow circulating fluidized bed system

Hengzhi Chen ^{a b *}, Dawei Yang ^a, Hongzhong Li ^b, Shiyu Tan ^a

a College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P.R. China
b Multiphase Reaction Laboratory, Institute of Process Engineering, Chinese Academy of Science, Beijing 100080, P.R. China

10.1016/S1672-2515(07)60255-3

Volume 4, Issues 3–4, July 2006, Pages 153-159

Received 10 January 2006, Accepted 2 April 2006, Available online 27 November 2007.

E-mail: hzhchen@cqu.edu.cn

Highlights

Abstract

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.

Graphical abstract

Keywords

circulating fluidized bed; operation stability; downer; riser

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