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Impact of random packing on residence time distribution of particles in bubbling fluidized beds: Part 1–cross-current flow reactors

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Název: Impact of random packing on residence time distribution of particles in bubbling fluidized beds: Part 1–cross-current flow reactors
Autoři: Nemati, Nasrin, 1988, Pröll, Tobias, Mattisson, Tobias, 1970, Rydén, Magnus, 1975
Zdroj: Tillämpning av packad-fluidiserad bädd för energiomvandling Produktion av vätgas och biokol från trädbränslen med ny process som utnyttjar steam-iron-reaktionen och järnmalms-koncentrat Chemical Engineering Science. 302
Témata: Residence Time Distribution, Packed-Fluidized Bed, Magnetic Solids Tracer, Cross-Current Flow, Confined Fluidization, Bubbling Fluidized Bed
Popis: In this work, the influence of employing random packings on the residence time distribution in a bubbling fluidized bed is investigated. The bubbling fluidized bed cold-flow reactor setup allows for continuous cross-current flow of particles. Expanded clay aggregate (ECA) is employed in the packed-fluidized bed experiments as the packing. The effects of different parameters such as packing type (ECA or no packing), Fluidization number (4.4, 6.6, and 8.8), and solid throughflow rates (92, 133, and 164 g/s) are investigated. The axial dispersion and tank-in-series models are used to categorize flow patterns of particles in the packed-fluidized beds and compared to beds using no packing. Results show that the vessel’s dispersion number for solids decreases in the presence of ECA packings up to fourfold compared to unpacked beds. Furthermore, tank-in-series model shows that the number of tanks for experiments utilizing packing increases by up to threefold compared to unpacked beds. The experimental results are also compared to a model known as a hybrid model. The hybrid model considers a continuous-stirred-tank-reactor in series with a plug-flow-reactor. Comparison of the model to the measured data shows a clear shift of the relative size or residence time from the stirred tank reactor towards the plug flow reactor with axial dispersion in the packed-fluidized bed compared to a bed with no packing. Also the vessel dispersion number of the plug flow reactor model with axial dispersion is significantly decreased in the case of packed-fluidized bed.
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  Data: Impact of random packing on residence time distribution of particles in bubbling fluidized beds: Part 1–cross-current flow reactors
– Name: Author
  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Nemati%2C+Nasrin%22">Nemati, Nasrin</searchLink>, 1988<br /><searchLink fieldCode="AR" term="%22Pröll%2C+Tobias%22">Pröll, Tobias</searchLink><br /><searchLink fieldCode="AR" term="%22Mattisson%2C+Tobias%22">Mattisson, Tobias</searchLink>, 1970<br /><searchLink fieldCode="AR" term="%22Rydén%2C+Magnus%22">Rydén, Magnus</searchLink>, 1975
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <i>Tillämpning av packad-fluidiserad bädd för energiomvandling Produktion av vätgas och biokol från trädbränslen med ny process som utnyttjar steam-iron-reaktionen och järnmalms-koncentrat Chemical Engineering Science</i>. 302
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Residence+Time+Distribution%22">Residence Time Distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Packed-Fluidized+Bed%22">Packed-Fluidized Bed</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+Solids+Tracer%22">Magnetic Solids Tracer</searchLink><br /><searchLink fieldCode="DE" term="%22Cross-Current+Flow%22">Cross-Current Flow</searchLink><br /><searchLink fieldCode="DE" term="%22Confined+Fluidization%22">Confined Fluidization</searchLink><br /><searchLink fieldCode="DE" term="%22Bubbling+Fluidized+Bed%22">Bubbling Fluidized Bed</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: In this work, the influence of employing random packings on the residence time distribution in a bubbling fluidized bed is investigated. The bubbling fluidized bed cold-flow reactor setup allows for continuous cross-current flow of particles. Expanded clay aggregate (ECA) is employed in the packed-fluidized bed experiments as the packing. The effects of different parameters such as packing type (ECA or no packing), Fluidization number (4.4, 6.6, and 8.8), and solid throughflow rates (92, 133, and 164 g/s) are investigated. The axial dispersion and tank-in-series models are used to categorize flow patterns of particles in the packed-fluidized beds and compared to beds using no packing. Results show that the vessel’s dispersion number for solids decreases in the presence of ECA packings up to fourfold compared to unpacked beds. Furthermore, tank-in-series model shows that the number of tanks for experiments utilizing packing increases by up to threefold compared to unpacked beds. The experimental results are also compared to a model known as a hybrid model. The hybrid model considers a continuous-stirred-tank-reactor in series with a plug-flow-reactor. Comparison of the model to the measured data shows a clear shift of the relative size or residence time from the stirred tank reactor towards the plug flow reactor with axial dispersion in the packed-fluidized bed compared to a bed with no packing. Also the vessel dispersion number of the plug flow reactor model with axial dispersion is significantly decreased in the case of packed-fluidized bed.
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        Value: 10.1016/j.ces.2024.120724
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      – Text: English
    Subjects:
      – SubjectFull: Residence Time Distribution
        Type: general
      – SubjectFull: Packed-Fluidized Bed
        Type: general
      – SubjectFull: Magnetic Solids Tracer
        Type: general
      – SubjectFull: Cross-Current Flow
        Type: general
      – SubjectFull: Confined Fluidization
        Type: general
      – SubjectFull: Bubbling Fluidized Bed
        Type: general
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      – TitleFull: Impact of random packing on residence time distribution of particles in bubbling fluidized beds: Part 1–cross-current flow reactors
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            NameFull: Nemati, Nasrin
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            – TitleFull: Tillämpning av packad-fluidiserad bädd för energiomvandling Produktion av vätgas och biokol från trädbränslen med ny process som utnyttjar steam-iron-reaktionen och järnmalms-koncentrat Chemical Engineering Science
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