Temperature influence on minimum fluidization velocity: Complexity, mechanism, and solutions--颗粒学报PARTICUOLOGY

Zhang, Q., Fu, L., Xu, G., & Bai, D. (2024). Temperature influence on minimum fluidization velocity: Complexity, mechanism, and solutions. Particuology, 88, 344-349. https://doi.org/10.1016/j.partic.2023.10.008

Temperature influence on minimum fluidization velocity: Complexity, mechanism, and solutions

Qingjin Zhang ^{a b}, Liangliang Fu ^{a c}, Guangwen Xu ^a, Dingrong Bai ^a *

a Key Laboratory on Resources Chemicals and Material of Ministry of Education, Shenyang University of Chemical Technology, Shenyang 110142, China
b School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110142, China
c School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China

10.1016/j.partic.2023.10.008

Volume 88, May 2024, Pages 344-349

Received 12 September 2023, Revised 5 October 2023, Accepted 15 October 2023, Available online 2 November 2023, Version of Record 24 November 2023.

E-mail: drbai@syuct.edu.cn

Highlights

• Temperature impacts minimum fluidization velocity U_mf via competition between hydrodynamic and interparticle forces.

• Temperature effects on U_mf are achieved by varying gas, bed voidage, and solid particle characteristics.

• No correlation is available to predict U_mf variation accurately over a wide temperature range.

• A better understanding of interparticle forces is required to develop reliable U_mf correlations.

Abstract

Fluidized-bed reactors are widely employed in various high-temperature industrial processes. Thus, it is crucial to understand the temperature effect on various fluidization phenomena, specifically the minimum fluidization velocity (U_mf) that governs various aspects of fluidized bed behavior. In this study, we comprehensively analyze Umf data from the literature to unravel the complexity and underlying mechanisms of temperature influence on this critical velocity. The research examines experimental data encompassing a wide range of temperatures, pressures, and solid particles. The analysis reveals that the influence of temperature on Umf is fundamentally determined by the relative importance of hydrodynamic forces and interparticle forces within fluidized beds and is realized by three distinctive temperature-induced changes: gas properties, bed voidage, and physiochemical characteristics of particles. On this basis, an equation is derived to enable predictions of temperature influences on the minimum fluidization velocity under broad temperature conditions.

Graphical abstract

Keywords

High-temperature gas-solids fluidized beds; Minimum fluidization velocity; Hydrodynamic forces; Interparticle forces; Bed voidage

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