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Separations
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Research Progress of Gas–Solid Fluidized Dry Separation
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Research Progress of Gas–Solid Fluidized Dry Separation

A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Separation Engineering".

Deadline for manuscript submissions: 30 July 2025 | Viewed by 2526

Special Issue Editor

Dr. Chenyang Zhou

E-Mail Website
Guest Editor
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, China
Interests: gas–solid fluidization hydrodynamics; dry coal separation

Special Issue Information

Dear Colleagues,

Coal plays an important role in much of the world’s energy security and energy strategy. A gas–solid beneficiation fluidized bed, belonging to a bubbling flow regime, is an indispensable area in the coal-processing field. The mentioned research mainly focus on the gas–solid fluidization hydrodynamics, coal beneficiation separation, fluidized bed industrial application, fluidized bed with additional force, such as the vibration fluidized bed and pulsed fluidized bed., etc. However, the relevant theory and technology still need to be highlighted and summarized. And the challenging issues that need special attention are suggested to enable further improvement of this process.

Therefore, it is my pleasure to invite you to contribute a research article, communication, or review for publication in this Special Issue titled “Research Progress of Gas-Solid Fluidized Dry Separation”.

Dr. Chenyang Zhou
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Separations is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • gas-solid fluidized bed
  • bubble behavior
  • gas–solid fluidization simulation
  • dry coal separation
  • two-phase theory
  • bed density stability

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Published Papers (3 papers)

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Research

17 pages, 3160 KiB  
Article
Prediction and Interpretative Analysis of Bed Expansion Ratio in Pulsed Fluidized Beds
by Yanjiao Li, Heng Jiang, Kun Hong and Liang Dong
Separations 2025, 12(4), 80; https://doi.org/10.3390/separations12040080 - 28 Mar 2025
Viewed by 225
Abstract
The bed expansion height serves as a macroscopic representation of the efficiency with which vibrational energy is transmitted within pulsed fluidized beds. Due to its complex nonlinear characteristics, further research is needed to explore the fluidization mechanisms in pulsed fluidized beds and identify [...] Read more.
The bed expansion height serves as a macroscopic representation of the efficiency with which vibrational energy is transmitted within pulsed fluidized beds. Due to its complex nonlinear characteristics, further research is needed to explore the fluidization mechanisms in pulsed fluidized beds and identify effective predictive models for expansion ratios. This work evaluates and analyzes the predictive capabilities of models established based on theoretical learning, as well as three machine learning methods. Additionally, dimensionless numbers are introduced to facilitate dimensionality reduction. Among these methods, the extreme gradient boosting model demonstrated exceptional performance, achieving an R2 value of 0.9907 on the training set and reaching 0.9300 on the testing set. Furthermore, an interpretability analysis of the extreme gradient boosting model was conducted using Shapley additive explanations, revealing that f/fn is the most significant factor influencing the bed expansion ratio, while H0/D has a relatively minor effect. These findings provide a basis for effectively predicting bed expansion ratios and facilitate further scale-up studies in pulsed fluidized beds. Full article
(This article belongs to the Special Issue Research Progress of Gas–Solid Fluidized Dry Separation)
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17 pages, 4437 KiB  
Article
Study on Separation Kinetics of Non-Spherical Single Feeding Particle in the Gas–Solid Separation Fluidized Bed
by Xuchen Fan, Yuping Fu, Yongliang He and Liying Sun
Separations 2024, 11(12), 341; https://doi.org/10.3390/separations11120341 - 28 Nov 2024
Viewed by 781
Abstract
Gas–solid separation fluidized bed is an efficient and clean coal separation technology with a good separation effect for coal particles. However, there is a lack of systematic research on the complex motion behavior of the feeding particles in gas–solid separation fluidized beds. In [...] Read more.
Gas–solid separation fluidized bed is an efficient and clean coal separation technology with a good separation effect for coal particles. However, there is a lack of systematic research on the complex motion behavior of the feeding particles in gas–solid separation fluidized beds. In this study, the separation kinetics of non-spherical single feeding particles in the fluidized bed are examined. The particle sphericity coefficient Φ is introduced to characterize the morphology of irregular coal particles, and the drag coefficient for the feeding particles is modified to verify the suitability of the non-spherical particle drag model for gas–solid fluidized bed separation. After optimization and correction, a ρS.sus (the bed density when single feeding particles are suspended in the gas–solid separation fluidized bed) prediction model is obtained. When the prediction accuracy of the ρS.sus prediction model is 90%, the confidence degree is 85.72%. This ρS.sus of the single non-spherical feeding particle prediction model highlights a direction for improving the separation effect, provides a theoretical basis for the industrialization of gas–solid fluidized bed, and promotes the process of dry fluidized separation. Full article
(This article belongs to the Special Issue Research Progress of Gas–Solid Fluidized Dry Separation)
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13 pages, 5275 KiB  
Article
Research on the Influence of the Scaling-up Process on the Flow Structure and Two-Phase Distribution of Gas–Solid Fluidized Beds
by Zhonglin Gao, Jie Wei, Hongyang Wang and Chenyang Zhou
Separations 2024, 11(7), 202; https://doi.org/10.3390/separations11070202 - 28 Jun 2024
Viewed by 994
Abstract
In the continuous scaling-up process of the separating system, a mechanism exists that transforms the behavior of the flow field, resulting in deviations from the original model and conclusions. The paper examined the effects of the scale up of a fluidized bed by [...] Read more.
In the continuous scaling-up process of the separating system, a mechanism exists that transforms the behavior of the flow field, resulting in deviations from the original model and conclusions. The paper examined the effects of the scale up of a fluidized bed by CFD. It was observed that increasing the diameter reduces the amplitude of axial density fluctuations. Similarly, increasing the static height increases the amplitude. Moreover, increasing the static bed height enhances the visibility of the cyclic flow structure of gas and solid phases. The flow structure in large bed diameters is disrupted. The impact of changing the bed diameter on bed density is more significant than the static height. As the bed diameter increases, the bubble disturbance decreases and the aggregation phase gradually disappears while the proportion of the emulsified phase keeps increasing. This study will guide and assist in the future application of separated fluidized beds in industry. Full article
(This article belongs to the Special Issue Research Progress of Gas–Solid Fluidized Dry Separation)
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