期刊
PARTICUOLOGY
卷 88, 期 -, 页码 344-349出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.partic.2023.10.008
关键词
High-temperature gas-solids fluidized beds; Minimum fluidization velocity; Hydrodynamic forces; Interparticle forces; Bed voidage
This study comprehensively analyzes the temperature effect on the minimum fluidization velocity (Umf) in fluidized-bed reactors. The analysis reveals the influence of temperature on Umf is determined by the relative importance of hydrodynamic forces and interparticle forces, which result in changes in gas properties, bed voidage, and physiochemical characteristics of particles. An equation is derived to predict the temperature influences on Umf under broad temperature conditions.
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, speciflcally the minimum fluidization velocity (Umf) 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. (c) 2023 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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