Operating range of magnetic stabilization flow regime for magnetized fluidized bed with Geldart-B magnetizable and nonmagnetizable particles--颗粒学报PARTICUOLOGY

Hao, W., & Zhu, Q. (2022). Operating range of magnetic stabilization flow regime for magnetized fluidized bed with Geldart-B magnetizable and nonmagnetizable particles. Particuology, 60, 90-98. https://doi.org/10.1016/j.partic.2021.02.004

Operating range of magnetic stabilization flow regime for magnetized fluidized bed with Geldart-B magnetizable and nonmagnetizable particles

Weikang Hao ^{a b}, Quanhong Zhu ^{b c *}

a College of Chemical Engineering, Hebei University of Technology, Tianjin 300401, China
b Qingdao Institue of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, Shandong, China
c Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

10.1016/j.partic.2021.02.004

Volume 60, January 2022, Pages 90-98

Received 27 November 2020, Revised 4 February 2021, Accepted 5 February 2021, Available online 8 April 2021, Version of Record 23 October 2021.

E-mail: zhuqh87@163.com

Highlights

It was not feasible to determine U_mbH from the οP_bU_g curve for admixture MFB.
UmbH could be identified from Ͽ_PU_g curve in uniform and steady magnetic field.
Absolute operating range of magnetic stabilization varied hardly with d_pM.
Operating range of magnetic stabilization increased as Ͽ_pM decreased.
Operating range of magnetic stabilization did not vary monotonously with U_mfM.

Abstract

The magnetic stabilization flow regime could also be created for Geldart-B nonmagnetizable particles provided some magnetizable particles are introduced and the magnetic field is applied. This study aimed to explore the size (d_pM) and density (Ͽ_pM) effects of magnetizable particles on its operating range. The upper limit (U_mbH) could not be determined from the οP_bU_g curve but could from analyzing the variation of οPb-fluctuation with increasing U_g. Due to the variation of UmfH (lower limit) with d_pM and Ͽ_pM, both U_mbH U_mfH and (U_mbHU_mfH)/U_mfH were used to quantify the operating range of magnetic stabilization. U_mbH U_mfH varied hardly with d_pM but increased significantly with decreasing Ͽ_pM. (U_mbHU_mfH)/U_mfH increased as d_pMor Ͽ_pM decreased. It was more difficult for the nonmagnetizable particles to escape from the network formed by the smaller/lighter magnetizable particles. For the same magnitude of change, d_pM had a stronger effect than Ͽ_pM on (U_mbHU_mfH)/U_mfH. Neither U_mbHU_mfH nor (U_mbHU_mfH)/U_mfH varied monotonously with the minimum fluidization velocity of the magnetizable particles, indicating that no straightforward criterion for matching the magnetizable particles to the given nonmagnetizable particles could be established based on their minimum fluidization velocities to maximize the operating range of magnetic stabilization.

Graphical abstract

Keywords

Magnetized fluidized bed; Binary mixture; Magnetic stabilization; Operating range; Nonmagnetizable particles; Magnetization-FIRST

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