New measurements on hydrodynamics in a gas–liquid–solid expanded bed--颗粒学报PARTICUOLOGY

Zhou, X., Ma, Y., Liu, M., Zhu, Y., & Zhang, J. (2021). New measurements on hydrodynamics in a gas–liquid–solid expanded bed. Particuology, 58, 276-284. https://doi.org/10.1016/j.partic.2021.04.013

New measurements on hydrodynamics in a gas–liquid–solid expanded bed

Xiuhong Zhou ^{a c}, Yongli Ma ^a *, Mingyan Liu ^{a b}, Yixian Zhu ^a, Jiaming Zhang ^a

a School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
b State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, China
c China Energy Longyuan Environmental Protection Co., Ltd., Beijing 100039, China

10.1016/j.partic.2021.04.013

Volume 58, October 2021, Pages 276-284

Received 2 February 2021, Revised 31 March 2021, Accepted 20 April 2021, Available online 9 May 2021, Version of Record 19 May 2021.

E-mail: mayl@tju.edu.cn

Highlights

• A new probe was applied in gas–liquid–solid expanded bed.

• A new data processing method was proposed to obtain the solid holdup.

• Effect of operating conditions on the transition ratio was discussed.

• Hydrodynamics in gas–liquid–solid expanded bed with small particles was studied.

Abstract

The solid holdup, in a 150 mm-ID × 2460 mm-height gas–liquid–solid expanded bed with air, water and glass beads (the diameter of particles is 0.6–0.8 mm) was firstly investigated based on the immersion-type online multiphase measuring instrument, and bubble behavior was studied via the BVW-2 double electrical conductivity probe. The effect of the superficial gas velocity and liquid velocity on the expanded ratio, the transition ratio, the bubble rising velocity, the gas holdup and the solid holdup was studied. It is discovered that compared with the gas velocity, the liquid velocity has stronger impact on the expanded ratio, but it is opposite for the transition ratio. The average gas holdup and solid holdup increase linearly as the superficial gas velocity goes up. Among it, the gas holdup increases greater in the center, while the solid holdup increases greater near the wall. Compared with it, when the superficial liquid velocity rises, the average gas holdup hardly changes, but the average solid holdup keeps decreasing, especially the solid holdup distributes flatter with the increase of the superficial liquid velocity.

Graphical abstract

Keywords

Phase holdup; Gas–liquid–solid expanded bed; Immersion-type online multiphase measuring instrument; BVW-2 double electrical conductivity probe

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