Insight into multi-level fluidization characteristics of a spout-fluid bed under different gas-solid actions: From monodisperse particles to bidisperse particles

Wang, Xuerong; Kang, Panxing; Li, Cai; Lu, Yifeng; Zhang, Jian; Wang, Zhiping; Zhou, Yefeng

doi:10.1016/j.powtec.2022.118006

Cited by 7 publications

(1 citation statement)

References 36 publications

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“…Over the past few decades, extensive research efforts have been dedicated to fluidized bed reactors, resulting in well-developed theories for monodisperse fluidization systems. However, in many industrial processes, particles of dissimilar sizes are commonly encountered, posing a significant challenge in comprehending the particle dispersion characteristics in polydisperse fluidization systems. − …”

Section: Introductionmentioning

confidence: 99%

Estimation of Particle Dispersion Characteristics in a Fluidized Bed with the Binary Mixture of Geldart A and B Types Using the Optical Fiber Probe Method

Song,

Liu,

Wang

et al. 2024

Ind. Eng. Chem. Res.

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This study proposes a novel method for experimentally assessing particle dispersion characteristics within a binary-mixture fluidized bed. Verification experiments were conducted, demonstrating satisfactory agreement between the measured results obtained from the optical fiber probe and actual values. Using this method, investigations were carried out to elucidate the flow mechanisms and the influence of key operational parameters on the radial, axial, and overall particle dispersion characteristics. The findings reveal that particle dispersion within the binary-mixture fluidized bed is influenced by the viscous stresses between particles and the initial packing state. Specifically, Geldart-A particles act as the flotsam phase, while Geldart-B particles serve as the jetsam phase. When the initial packing ratio of the flotsam phase exceeds 70%, viscous stresses between particles primarily govern the dispersion characteristics. Increasing the superficial gas velocity weakens the viscosity effect, enhancing radial and axial dispersion uniformity. Conversely, when the initial packing ratio of the jetsam phase surpasses 70%, the dispersion characteristics are predominantly influenced by the saturation degree of the particle packing. Higher gas velocity exerts a greater impact on radial dispersion as well as axial and overall dispersion characteristics. Generally, a higher flotsam phase packing ratio or superficial gas velocity promotes a more uniform particle dispersion within the bed. The proposed optical fiber probe method proves to be effective in measuring particle dispersion in binary-mixture systems, contributing to advancements in measurement theories and techniques for industrial binary-mixture fluidization.

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Section: Introductionmentioning

confidence: 99%

Estimation of Particle Dispersion Characteristics in a Fluidized Bed with the Binary Mixture of Geldart A and B Types Using the Optical Fiber Probe Method

Song,

Liu,

Wang

et al. 2024

Ind. Eng. Chem. Res.

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Investigation on the influence of particle size and porosity on solid phase fluidization and heat transfer in carbon fibre porous media

Wang,

Zhang,

Yang

2024

Can J Chem Eng

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In this paper, the 3D pore structure was reconstructed and solid phase fluidization in porous media was investigated. Based on the two fluid model, a computational fluid dynamics (CFD) model of gas–solid fluidization was established and the influence of particle size and porosity were investigated. When porosity was constant, during the fluidization process, the particle velocity and solid concentration standard deviation gradually decreased, and the bed height increased. At the same time, the smaller the particle size was, the smaller the solid concentration standard deviation was, the faster the bed height increased, and the more the particle temperature decreased. Based on the fixed value of particle size, when studying the effect of porosity on fluidization, it was found that with the enhancement of solid‐phase fluidization, particle velocity, solid concentration standard deviation, and particle temperature decreased, and bed height increased. Moreover, when porosity was large, particle velocity decreased rapidly, and solid concentration standard deviation reached a smaller minimum value, which took a longer time. Within the same time, the particle temperature also decreased less.

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Solid-fluid mixing behavior of conical spouted beds with internal devices

Atxutegi

Kieckhefen

Pietsch‐Braune

et al. 2023

Advanced Powder Technology

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Insight into multi-level fluidization characteristics of a spout-fluid bed under different gas-solid actions: From monodisperse particles to bidisperse particles

Cited by 7 publications

References 36 publications

Estimation of Particle Dispersion Characteristics in a Fluidized Bed with the Binary Mixture of Geldart A and B Types Using the Optical Fiber Probe Method

Estimation of Particle Dispersion Characteristics in a Fluidized Bed with the Binary Mixture of Geldart A and B Types Using the Optical Fiber Probe Method

Investigation on the influence of particle size and porosity on solid phase fluidization and heat transfer in carbon fibre porous media

Solid-fluid mixing behavior of conical spouted beds with internal devices

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