Investigation into maldistribution in a circulating fluidized bed--颗粒学报PARTICUOLOGY

Guo, Q., Werther, J., & Hartge, E.-U. (2003). Investigation into maldistribution in a circulating fluidized bed. China Particuology, 1(4), 145-150. https://doi.org/10.1016/S1672-2515(07)60131-6

Investigation into maldistribution in a circulating fluidized bed

Qingjie Guo ^a *, Joachim Werther ^b, Ernst-Ulrich Hartge ^b

a State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, University of Petroleum, Dongying 250761, P. R. China
b Chemical Engineering I, Technical University Hamburg-Harburg, Denickestr. 15, 21073 Hamburg, Germany

10.1016/S1672-2515(07)60131-6

Volume 1, Issue 4, September 2003, Pages 145-150

Received 28 May 2003, Accepted 27 June 2003, Available online 27 November 2007.

E-mail: qjguo@mail.hdpu.edu.cn

Highlights

Abstract

Experiments on maldistribution were conducted in a 8.5 m high, 1 m×0.3 m cross-section circulating fluidized bed equipped with a 33 bubble-cap distributor. There exists an uneven distribution in flow rate, the bubble caps in the center region having larger flow rates than those next to the wall. Flow resistance has been found to be the dominating factor influencing gas flow rate distribution. Increasing superficial gas velocity improves flow rate distribution for a low pressure-drop distributor. For a high pressure-drop distributor, superficial gas velocity has little effect on flow rate distribution. A ratio of maximum flow rate through a bubble cap to average flow rate through all bubble caps (V_max/V_av) characterizes the flow rate distribution. Distributor-to-bed pressure drop ratio (ΔP_d/ΔP_r) is another necessary parameter to achieve even flow distribution. A correlation between these two ratios is developed for predicting flow rate maldistribution in CFB bubble-cap distributor.

Graphical abstract

Keywords

circulating fluidized bed; maldistribution; bubble cap; flow rate; pressure drop

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