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Fluidisation behaviour and wall effects of cohesive hydrotalcilte powder in a micro-fluidised bed

Lookup NU author(s): Dr Awad Alamri, Dr Jonathan McDonough, Dr Vladimir Zivkovic

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

Hydrotalcites are a promising candidate for capturing CO₂, but their strong inter-particle forces produce significant agglomeration and poor fluidisation quality in micro-fluidised bed technology. Therefore, in this study we performed detailed hydrodynamic experiments using the pressure drop characterisation approach to identify viable MFBR designs and operating conditions for these Geldart C powders. Our results show that a simple combination of pre-sieving the particles to remove the fines (retaining sizes of >53 μm; density of 2 g/cm³) and pre-fluidisation drastically improved the fluidisation quality. Here the pressure overshoot prior to fluidisation and slugging behaviour were minimised. Additionally, mixing a secondary inert Geldart A particle to the hydrotalcite powder (silica; 93 ± 10 μm; density of 2.65 g/cm³) also reduced the presence of slugging and pressure overshoot. These treatments were valid in three 3D-printed MFBRs (bed diameters of D_t = 10–15 mm) at all bed heights tested (H_s/D_t = 1–3).

Publication metadata

Author(s): Alamri A, McDonough J, Zivkovic V

Publication type: Article

Publication status: Published

Journal: Powder Technology

Year: 2023

Volume: 415

Pages: 118192

Print publication date: 01/02/2023

Online publication date: 21/12/2022

Acceptance date: 20/12/2022

Date deposited: 06/01/2023

ISSN (print): 0032-5910

ISSN (electronic): 1873-328X

Publisher: Elseiver

URL: https://doi.org/10.1016/j.powtec.2022.118192

DOI: 10.1016/j.powtec.2022.118192

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