The transition to turbulent fluidization in a gas-solid fluidized bed operating from ambient temperature to 1600 °C--颗粒学报PARTICUOLOGY

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

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

• U_c 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 U_c–T variation.

• Previous correlations predict U_c unsatisfactorily across wide temperature ranges.

• New empirical correlations are proposed to improve the U_c 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 (U_c), 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 U_c 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 U_c 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

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