A hydrodynamic model of loop seal with a fluidized standpipe for a circulating fluidized bed--颗粒学报PARTICUOLOGY

Li, C., Zou, Z., Li, H., & Zhu, Q. (2018). A hydrodynamic model of loop seal with a fluidized standpipe for a circulating fluidized bed. Particuology, 36, 50-58. https://doi.org/10.1016/j.partic.2017.02.005

A hydrodynamic model of loop seal with a fluidized standpipe for a circulating fluidized bed

Changjin Li ^a, Zheng Zou ^a, Hongzhong Li^{a b *}, Qingshan Zhu^{a b *}

a State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
b University of Chinese Academy of Sciences, Beijing 100049, China

10.1016/j.partic.2017.02.005

Volume 36, February 2018, Pages 50-58

Received 16 November 2016, Revised 25 January 2017, Accepted 21 February 2017, Available online 20 June 2017, Version of Record 22 December 2017.

E-mail: hzli@ipe.ac.cn; qszhu@ipe.ac.cn

Highlights

• Hydrodynamic behavior of a loop seal with a fluidized standpipe in a CFB was studied.

• A hydrodynamic model consisting of thirteen equations was established.

• The model predictions showed good agreement with experimental data.

Abstract

Loop seals are among the most common non-mechanical valves used in circulating fluidized bed systems. In the present work, a fundamental study is conducted of a fluidized loop seal, which consists of a fluidized standpipe, a fluidized supply chamber, and a fluidized recycling chamber. Based on the principles of momentum, mass, and energy conservation, a hydrodynamic model for a loop seal is established, consisting of 13 equations. The effects of operating conditions such as the bottom aeration rate, total solid inventory, and fluidizing gas velocity in the riser on the solids flow rate and the performance of the loop seal are studied by a combination of model analysis and experiments. The experiments are carried out in a circulating fluidized bed with silica gel particles (Geldart group A). The model predictions show good agreement with the experimental data.

Graphical abstract

Keywords

Circulating fluidized bed; Loop seal; Hydrodynamic model

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