X-ray computed tomography (XCT) study of jetting in a fluidized bed: Effects of two-component fluidization--颗粒学报PARTICUOLOGY

Xiang, Z., Chen, X., Liu, S., & Heindel, T. J. (2025). X-ray computed tomography (XCT) study of jetting in a fluidized bed: Effects of two-component fluidization. Particuology, 102, 264-274. https://doi.org/10.1016/j.partic.2025.04.017

X-ray computed tomography (XCT) study of jetting in a fluidized bed: Effects of two-component fluidization

Zhong Xiang^{a b}, Xi Chen^{a b *}, Shuguang Liu^{a b}, Theodore J. Heindel^c

a School of Energy and Environment, Southeast University, Nanjing, 210096, China
b State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission, Southeast University, Nanjing, 210096, China
c Center for Multiphase Flow Research and Education and Department of Mechanical Engineering, Iowa State University, Ames, IA, 50011, USA

10.1016/j.partic.2025.04.017

Volume 102, July 2025, Pages 264-274

Received 10 February 2025, Revised 7 April 2025, Accepted 17 April 2025, Available online 2 May 2025, Version of Record 23 May 2025.

E-mail: chenxiseu@seu.edu.cn

Highlights

• High-resolution tomography captures aeration jets in fluidized beds.

• Key factors of jet formation in non-spherical particle fluidization.

• Particle density dominates jet morphology over sphericity.

• Novel correlation for jet length in binary fluidized beds.

Abstract

Fluidization of non-spherical particles is commonly found in the biomass and solid waste processing industry, and the jetting characteristic above the aeration plate is critical to the fluidization performance of these particles. In this study, cylindrical particles are used as typical non-spherical particles and co-fluidized with small bed material particles. X-ray computed tomography (XCT) is used to reconstruct the 3D structure of the aeration plate region, allowing for the identification of individual aeration jets. The effects of jet velocity (U_j), cylindrical particle mass fraction (ω), cylindrical particle density (ρ_i), and the cylindrical particle sphericity (ϕ) on jet shape and volume are investigated. The experimental results indicate that decreasing the cylindrical particle mass fraction (ω) and particle density (ρ_i) increases the jet length (L), maximum jet diameter (D), and maximum jet volume (V), but have little effect on the jet half angle (θ). The cylindrical particle density (ρ_i) is the most sensitive factor for jet shape, while the effect of cylinder particle sphericity (ϕ) on jet shape is insignificant. A correlation of jet length (L) in a two-component fluidized bed with cylindrical particles and bed material is proposed based on all the experimental results.

Graphical abstract

Keywords

Binary fluidized bed; Cylindrical particle fluidization; Jetting; X-ray computed tomography

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