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Critical comparison of air dense medium fluidized bed (ADMFB) and pulsed fluidized bed (PFB) based on simulations and experiments.

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Title: Critical comparison of air dense medium fluidized bed (ADMFB) and pulsed fluidized bed (PFB) based on simulations and experiments.
Authors: Gao, Zhonglin1 (AUTHOR) zlgao@cumt.edu.cn, Wei, Jie1 (AUTHOR), Wang, Hongyang1 (AUTHOR), Zhang, Yong1 (AUTHOR), Zhou, Chenyang2 (AUTHOR)
Source: International Journal of Coal Preparation & Utilization. 2025, Vol. 45 Issue 12, p2950-2967. 18p.
Subjects: Fluidization, Density, Simulation methods & models, Two-phase flow, Coal dust, Scientific experimentation, Frequencies of oscillating systems
Abstract: In the present work, based on the traditional air dense medium fluidized bed (ADMFB), the constant gas velocity was substituted with pulsating velocity to propose pulsating fluidized bed (PFB) to investigate the distinct advantages in separating the fine coal particles in PFB over ADMFB. In this regard, the two-fluid model (TFM) was used to study the formation of bubbles, the distribution of density, and the gas-solid motion in PFB. The simulation results showed that lower bed height could decrease the energies of collision and mergers. The reason why the diameter of bubbles in PFB was much smaller than ADMFB was that the pulsating mechanism could effectively cut off the aggregation channels of gas below the lower pressure domain of bubbles. Moreover, the dense medium particles presented the upward movement in the middle of the bed and downward movement near the side walls. The distribution of bed density in PFB showed more stable condition from the spatial and temporal aspects. Finally, based on the orthogonal experiments, a correlation for estimating the fluctuations in bed density was established to illustrate the optimum values for bed height and pulsation frequency for airflow, which had values of approximately 100 mm and 2.0 hz, respectively. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Coal Preparation & Utilization is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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An: 189730909
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Critical comparison of air dense medium fluidized bed (ADMFB) and pulsed fluidized bed (PFB) based on simulations and experiments.
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  Data: <searchLink fieldCode="AR" term="%22Gao%2C+Zhonglin%22">Gao, Zhonglin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> zlgao@cumt.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wei%2C+Jie%22">Wei, Jie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Hongyang%22">Wang, Hongyang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Yong%22">Zhang, Yong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhou%2C+Chenyang%22">Zhou, Chenyang</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Coal+Preparation+%26+Utilization%22">International Journal of Coal Preparation & Utilization</searchLink>. 2025, Vol. 45 Issue 12, p2950-2967. 18p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Fluidization%22">Fluidization</searchLink><br /><searchLink fieldCode="DE" term="%22Density%22">Density</searchLink><br /><searchLink fieldCode="DE" term="%22Simulation+methods+%26+models%22">Simulation methods & models</searchLink><br /><searchLink fieldCode="DE" term="%22Two-phase+flow%22">Two-phase flow</searchLink><br /><searchLink fieldCode="DE" term="%22Coal+dust%22">Coal dust</searchLink><br /><searchLink fieldCode="DE" term="%22Scientific+experimentation%22">Scientific experimentation</searchLink><br /><searchLink fieldCode="DE" term="%22Frequencies+of+oscillating+systems%22">Frequencies of oscillating systems</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In the present work, based on the traditional air dense medium fluidized bed (ADMFB), the constant gas velocity was substituted with pulsating velocity to propose pulsating fluidized bed (PFB) to investigate the distinct advantages in separating the fine coal particles in PFB over ADMFB. In this regard, the two-fluid model (TFM) was used to study the formation of bubbles, the distribution of density, and the gas-solid motion in PFB. The simulation results showed that lower bed height could decrease the energies of collision and mergers. The reason why the diameter of bubbles in PFB was much smaller than ADMFB was that the pulsating mechanism could effectively cut off the aggregation channels of gas below the lower pressure domain of bubbles. Moreover, the dense medium particles presented the upward movement in the middle of the bed and downward movement near the side walls. The distribution of bed density in PFB showed more stable condition from the spatial and temporal aspects. Finally, based on the orthogonal experiments, a correlation for estimating the fluctuations in bed density was established to illustrate the optimum values for bed height and pulsation frequency for airflow, which had values of approximately 100 mm and 2.0 hz, respectively. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Coal Preparation & Utilization is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1080/19392699.2024.2447784
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        Text: English
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      – SubjectFull: Density
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      – SubjectFull: Coal dust
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      – SubjectFull: Scientific experimentation
        Type: general
      – SubjectFull: Frequencies of oscillating systems
        Type: general
    Titles:
      – TitleFull: Critical comparison of air dense medium fluidized bed (ADMFB) and pulsed fluidized bed (PFB) based on simulations and experiments.
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            NameFull: Gao, Zhonglin
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            NameFull: Wei, Jie
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            NameFull: Wang, Hongyang
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            NameFull: Zhang, Yong
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            NameFull: Zhou, Chenyang
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            – D: 01
              M: 12
              Text: 2025
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