Hydrodynamics in a new liquid–solid circulating conventional fluidized bed--颗粒学报PARTICUOLOGY

Fu, J., Pan, X., Sun, Z., Liu, R., Zheng, Y., & Zhu, J. (2022). Hydrodynamics in a new liquid–solid circulating conventional fluidized bed. Particuology, 70, 20-29. https://doi.org/10.1016/j.partic.2022.01.003

Hydrodynamics in a new liquid–solid circulating conventional fluidized bed

Jingya Fu, Xinyu Pan, Zeneng Sun ^*, Ruoting Liu, Ying Zheng, Jesse Zhu ^*

Particle Technology Research Centre, Department of Chemical and Biochemical Engineering, Western University, London, Ontario, N6A 5B9, Canada

10.1016/j.partic.2022.01.003

Volume 70, November 2022, Pages 20-29

Received 30 August 2021, Revised 22 October 2021, Accepted 4 January 2022, Available online 13 January 2022, Version of Record 20 January 2022.

E-mail: zsun82@uwo.ca; jzhu@uwo.ca

Highlights

• A newly-proposed liquid–solid circulating conventional fluidized bed (CCFB) was experimentally studied.

• Liquid fluidization with external circulation below particle terminal velocity was realized.

• The axial solids holdup is uniform in a wide range of operating conditions.

• A higher overall solids holdup is achieved in CCFB compared to conventional fluidization.

• Particles with higher terminal velocity have higher average solids holdup in CCFB.

Abstract

A new type of liquid–solid fluidized bed, named circulating conventional fluidized bed (CCFB) which operates below particle terminal velocity was proposed and experimentally studied. The hydrodynamic behavior was systematically studied in a liquid–solid CCFB of 0.032 m I.D. and 4.5 m in height with five different types of particles. Liquid–solid fluidization with external particle circulation was experimentally realized below the particle terminal velocity. The axial distribution of local solids holdup was obtained and found to be fairly uniform in a wide range of liquid velocities and solids circulation rates. The average solids holdup is found to be significantly increased compared with conventional fluidization at similar conditions. The effect of particle properties and operating conditions on bed behavior was investigated as well. Results show that particles with higher terminal velocity have higher average solids holdup.

Graphical abstract

Keywords

Circulating conventional fluidized bed (CCFB); Solids holdup; Solids circulation rate; Superficial liquid velocity; Particle properties; Operating conditions

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