Volume 93
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Zhang, Q., Fu, L., Xu, G., & Bai, D. (2024). The transition to turbulent fluidization in a gas-solid fluidized bed operating from ambient temperature to 1600 °C. Particuology, 93, 111-124. https://doi.org/10.1016/j.partic.2024.06.008
The transition to turbulent fluidization in a gas-solid fluidized bed operating from ambient temperature to 1600 °C
Qingjin Zhang a b, Liangliang Fu a, Guangwen Xu a, Dingrong Bai a c *
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 Ordos Laboratory, Ordos, 017010, China
10.1016/j.partic.2024.06.008
Volume 93, October 2024, Pages 111-124
Received 10 May 2024, Revised 12 June 2024, Accepted 13 June 2024, Available online 26 June 2024, Version of Record 1 July 2024.
E-mail: drbai@syuct.edu.cn

Highlights

• Uc varies with temperature (T) distinctively depending on temperature ranges.

• Uc increases with T up to 600 °C, plateaus at 600–1200 °C, and decreases above 1200 °C.

• The relative significance of hydrodynamic and interparticle forces dictates UcT variation.

• Previous correlations predict Uc unsatisfactorily across wide temperature ranges.

• New empirical correlations are proposed to improve the Uc predictions.


Abstract

Turbulent fluidized bed proves effective in industrial processes due to superior heat and mass transfer and chemical reaction performance. However, understanding the transition to turbulent fluidization remains limited, especially at temperatures exceeding 1000 °C, making it challenging to develop high-temperature fluidized bed applications. This paper presents an experimental investigation on the turbulent fluidization onset velocity (Uc), measured in a 30 mm diameter bed using corundum particles with average diameters from 0.68 mm to 1.58 mm in temperatures from ambient to 1600 °C. Experimental results reveal that Uc increases with temperature up to 600 °C, stabilizes within the 600–1200 °C range, and then decreases above 1200 °C, demonstrating the varying relative significance of hydrodynamic and interparticle forces at different temperatures. To help design and operate high-temperature applications of turbulent fluidization, we developed Uc correlations based on experimental data from both literature sources and this study, covering temperatures of up to 1600 °C and particles of Groups A to D.

Graphical abstract
Keywords
High-temperature fluidized beds; Turbulent fluidization; Transition velocity; Pressure fluctuations; Hydrodynamic forces; Interparticle forces