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Radar-based measure...
Radar-based measurement of solids back-mixing in the freeboard of a circulating fluidized bed
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- Wu, Wanqiang, 1992 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Guio Perez, Diana Carolina, 1985 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Bonmann, Marlene, 1988 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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visa fler...
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- Johnsson, Filip, 1960 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Duan, Lunbo (författare)
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- Pallares Tella, David, 1975 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2024
- 2024
- Engelska.
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Ingår i: Chemical Engineering Journal. - 1385-8947. ; 488
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- This work investigates solids back-mixing in the freeboard of a circulating fluidized bed based on THz-radar measurements of the concentrations and velocity distributions of the solid particles along the height of the riser. These data allow height-resolved closure of the solids mass balance and, thereby, quantification and further insight of the two main mechanisms for the back-mixing of the solids entrained from the bottom region of the fluidized bed: (i) solids disengagement and backmixing within the core region of the riser cross-section,; and (ii) solids lateral transfer of from the core region to the wall layers. The experiments were carried out in a circulating fluidized bed riser (3.1 m in height and 0.45 m2 in cross-section), which was operated with Geldart B solids fluidized with air at room temperature and for different gas velocities. The experimentally-derived data are expressed in terms of the disengagement rate and a lateral core-to-wall layer mass transfer coefficient. From the results, it is estimated that the presence of disengagement-based solids back-mixing is significant all along the 3-m riser. The disengagement rate shows a non-linear dependency on the solids concentration, with the lateral solids transfer to the walls (which follows a linear dependency on the solids concentration) eventually becoming the dominant form of back-mixing at upper heights.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
Nyckelord
- Solids mixing
- Circulating fluidized bed
- Doppler effect
- Sub-millimeter wave radar diagnostics
- Solids disengagement
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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