High temperature micro fluidization of limestones--颗粒学报PARTICUOLOGY

Asiedu-Boateng, P., Asiedu, N. Y., Patience, G. S., McDonough, J. R., & Zivkovic, V. (2026). High temperature micro fluidization of limestones. Particuology, 108, 156-167. https://doi.org/10.1016/j.partic.2025.10.020

High temperature micro fluidization of limestones

Peter Asiedu-Boateng^{a b *}, Nana Yaw Asiedu^a, Gregory S. Patience^b, Jonathan R. McDonough^c, Vladimir Zivkovic^c

a Chemical Eng. Dept., College of Engineering, Kwame Nkrumah University of Science & Tech, Kumasi, Ghana
b Department of Chem. Eng, Polytechnique Montreal, C.P. 6079, Succ. CV, Montreal, H3C 3A7, Quebec, Canada
c School of Engineering, Merz Court, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK

10.1016/j.partic.2025.10.020

Volume 108, January 2026, Pages 156-167

Received 25 July 2025, Revised 8 October 2025, Accepted 23 October 2025, Available online 5 November 2025, Version of Record 3 December 2025.

E-mail: peter.asiedu-boateng@polymtl.ca

Highlights

• Dominant frequency reduces as the operating temperature increases.

• Particle-bed wall effect on fluidization behavior increases at elevated temperatures.

• Inter particle forces dominate wall effects with increasing temperature.

• Structural changes in particles with temperature significantly alter bubble dynamics.

• Slugging is bigger issue for high temperatures in micro fluidized bed reactors.

Abstract

Micro fluidized bed reactors (MFBRs) operating at high temperatures hold great potential for finding suitable conditions for kinetic screening experiments for CO2 capture sorbents. Additionally, high temperature hydrodynamics study using MFBRs prior to kinetics analysis could enable the acquisition of realistic and intrinsic kinetic data in transport phenomena-induced processes but the existence of wall effects could negatively impact quality of fluidization and cause delayed fluidization even though it may aid reaction kinetics. High temperature hydrodynamic studies in MFBRs remains relatively unexplored despite its enormous potential. In this work, we designed a high temperature MFBR system to perform detailed hydrodynamic experiments using pressure drop characterization approach to analyze the effect of temperature and bed-wall friction on various fluidization regimes with Geldart B limestone sorbents by controlling temperature with portable induction heater. Results show that minimum fluidization velocity decreases with increasing temperature for both Nauli and Oterpkolu limestones due to increased Van der Waals forces and the cohesiveness between particles at elevated temperature; with the gradient of the decrease in minimum fluidization velocity being steeper between ambient temperature and 400 °C compared to the drop between 400 and 800 °C. At 600 °C, bubbles started appearing at air flow rate of (0.065 m/s) but bubbling started at 0.142 m/s and 400 °C. Frequency spectra revealed that the superficial gas velocity at which a dominant frequency is attained (when slugging fluidization begins) reduces as the operating temperature increases. Additionally, bed pressure drop overshoot per volume of particle bed increases with increasing operating temperature.

Graphical abstract

Keywords

Micro-fluidized bed; High temperature fluidization; Induction heating; Frequency analysis

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