Comparison of solids conveying mechanisms in fluidized bed systems – Alternatives to riser
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| Název: | Comparison of solids conveying mechanisms in fluidized bed systems – Alternatives to riser |
|---|---|
| Autoři: | Farha, Munavara, 1995, Guio Perez, Diana Carolina, 1985, Johnsson, Filip, 1960, Pallarès, David, 1975 |
| Zdroj: | Termokemisk samproduktion i kraftvärmesektorn Chemical Engineering Science. 317 |
| Témata: | Fluidized bed system, Fluid-dynamical scaling, Bubbling fluidized bed, Solids convective transport, Fluidization |
| Popis: | The macroscopic convective transport of solids in fluidized bed systems is vital for efficient heat and mass transfer in solids-looping and solids-throughput processes. While risers are a conventional setup to promote solids convection, emerging applications demand higher solids flux and more compact, energy-efficient alternatives. This study investigates five solids conveying mechanisms in a fluid-dynamically down-scaled cold flow model using Geldart B-type solids. The system features a closed circulation loop, interconnecting a bubbling bed with a conveying module that induces net horizontal solids crossflow. Each conveying strategy is driven by a distinct mechanism: (i) Free solids splashing relies on bubble bursts at the bed surface to eject particles; (ii) Confined solids splashing amplifies this effect within a narrow geometry through turbulent interactions to enhance particle lift; (iii) Slugging induces transport via the rise and collapse of gas slugs in vertical ducts; (iv) Solids entrainment achieves lift by elutriating particles from the dense bed through high gas velocities; and (v) Directed gas injection imparts lateral momentum via angled nozzles. The solids flow rate is measured using magnetic solids tracing technique. Conveying efficiency is assessed by comparing energy imparted to solids with energy input from fluidization gas. Free solids splashing and directed gas injection achieve the highest upscaled transport rates (5 × 10 −2 –2 × 10 3 kg/m 2 ⋅s) at gas velocities of 1.9–4.3 m/s, outperforming conventional risers. Free solids splashing also offers the highest energy efficiency, while slugging and directed gas injection offer intermediate performance. Confined solids splashing and solids entrainment show the lowest efficiency. |
| Popis souboru: | electronic |
| Přístupová URL adresa: | https://research.chalmers.se/publication/547079 https://research.chalmers.se/publication/547079/file/547079_Fulltext.pdf |
| Databáze: | SwePub |
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| Items | – Name: Title Label: Title Group: Ti Data: Comparison of solids conveying mechanisms in fluidized bed systems – Alternatives to riser – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Farha%2C+Munavara%22">Farha, Munavara</searchLink>, 1995<br /><searchLink fieldCode="AR" term="%22Guio+Perez%2C+Diana+Carolina%22">Guio Perez, Diana Carolina</searchLink>, 1985<br /><searchLink fieldCode="AR" term="%22Johnsson%2C+Filip%22">Johnsson, Filip</searchLink>, 1960<br /><searchLink fieldCode="AR" term="%22Pallarès%2C+David%22">Pallarès, David</searchLink>, 1975 – Name: TitleSource Label: Source Group: Src Data: <i>Termokemisk samproduktion i kraftvärmesektorn Chemical Engineering Science</i>. 317 – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Fluidized+bed+system%22">Fluidized bed system</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid-dynamical+scaling%22">Fluid-dynamical scaling</searchLink><br /><searchLink fieldCode="DE" term="%22Bubbling+fluidized+bed%22">Bubbling fluidized bed</searchLink><br /><searchLink fieldCode="DE" term="%22Solids+convective+transport%22">Solids convective transport</searchLink><br /><searchLink fieldCode="DE" term="%22Fluidization%22">Fluidization</searchLink> – Name: Abstract Label: Description Group: Ab Data: The macroscopic convective transport of solids in fluidized bed systems is vital for efficient heat and mass transfer in solids-looping and solids-throughput processes. While risers are a conventional setup to promote solids convection, emerging applications demand higher solids flux and more compact, energy-efficient alternatives. This study investigates five solids conveying mechanisms in a fluid-dynamically down-scaled cold flow model using Geldart B-type solids. The system features a closed circulation loop, interconnecting a bubbling bed with a conveying module that induces net horizontal solids crossflow. Each conveying strategy is driven by a distinct mechanism: (i) Free solids splashing relies on bubble bursts at the bed surface to eject particles; (ii) Confined solids splashing amplifies this effect within a narrow geometry through turbulent interactions to enhance particle lift; (iii) Slugging induces transport via the rise and collapse of gas slugs in vertical ducts; (iv) Solids entrainment achieves lift by elutriating particles from the dense bed through high gas velocities; and (v) Directed gas injection imparts lateral momentum via angled nozzles. The solids flow rate is measured using magnetic solids tracing technique. Conveying efficiency is assessed by comparing energy imparted to solids with energy input from fluidization gas. Free solids splashing and directed gas injection achieve the highest upscaled transport rates (5 × 10 −2 –2 × 10 3 kg/m 2 ⋅s) at gas velocities of 1.9–4.3 m/s, outperforming conventional risers. Free solids splashing also offers the highest energy efficiency, while slugging and directed gas injection offer intermediate performance. Confined solids splashing and solids entrainment show the lowest efficiency. – Name: Format Label: File Description Group: SrcInfo Data: electronic – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="https://research.chalmers.se/publication/547079" linkWindow="_blank">https://research.chalmers.se/publication/547079</link><br /><link linkTarget="URL" linkTerm="https://research.chalmers.se/publication/547079/file/547079_Fulltext.pdf" linkWindow="_blank">https://research.chalmers.se/publication/547079/file/547079_Fulltext.pdf</link> |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.ces.2025.122000 Languages: – Text: English Subjects: – SubjectFull: Fluidized bed system Type: general – SubjectFull: Fluid-dynamical scaling Type: general – SubjectFull: Bubbling fluidized bed Type: general – SubjectFull: Solids convective transport Type: general – SubjectFull: Fluidization Type: general Titles: – TitleFull: Comparison of solids conveying mechanisms in fluidized bed systems – Alternatives to riser Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Farha, Munavara – PersonEntity: Name: NameFull: Guio Perez, Diana Carolina – PersonEntity: Name: NameFull: Johnsson, Filip – PersonEntity: Name: NameFull: Pallarès, David IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 00092509 – Type: issn-locals Value: SWEPUB_FREE – Type: issn-locals Value: CTH_SWEPUB Numbering: – Type: volume Value: 317 Titles: – TitleFull: Termokemisk samproduktion i kraftvärmesektorn Chemical Engineering Science Type: main |
| ResultId | 1 |