CFD Modelling of particle mixtures in a 2D CFB

Maiju Seppälä, Sirpa Kallio

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Abstract

The capability of Fluent 6.2.16 to simulate particle mixtures in a laboratory scale 2D circulating fluidized bed (CFB) unit has been tested. In the simulations, the solids were described as one or two particle phases. The loading ratio of small to large particles, particle diameters and the gas inflow velocity were varied. The paper presents the segregation patterns of the particle phases obtained from the simulations. When the fraction of large particles was 50% or larger, large particles segregated, as expected, to the wall regions and to the bottom part of the riser. However, when the fraction of large particles was 10%, an excess of large particles was found in the upper half of the riser. The explanation for this unexpected phenomenon was found in the distribution of the large particles between the slow clusters and the faster moving lean suspension.
Original languageEnglish
Title of host publicationProceedings of the 20th International Conference on Fluidized Bed Combustion
Place of PublicationBeijing
Pages851-856
Publication statusPublished - 2009
MoE publication typeA4 Article in a conference publication
Event20th International Conference on Fluidized Bed Combustion - Xi'an, China
Duration: 18 May 200921 May 2009

Conference

Conference20th International Conference on Fluidized Bed Combustion
CountryChina
CityXi'an
Period18/05/0921/05/09

Fingerprint

modeling
riser
particle
simulation
inflow
gas

Keywords

  • particle mixtures
  • CFD
  • 2D
  • hydrodynamics
  • CFB

Cite this

Seppälä, M., & Kallio, S. (2009). CFD Modelling of particle mixtures in a 2D CFB. In Proceedings of the 20th International Conference on Fluidized Bed Combustion (pp. 851-856). Beijing.
Seppälä, Maiju ; Kallio, Sirpa. / CFD Modelling of particle mixtures in a 2D CFB. Proceedings of the 20th International Conference on Fluidized Bed Combustion. Beijing, 2009. pp. 851-856
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abstract = "The capability of Fluent 6.2.16 to simulate particle mixtures in a laboratory scale 2D circulating fluidized bed (CFB) unit has been tested. In the simulations, the solids were described as one or two particle phases. The loading ratio of small to large particles, particle diameters and the gas inflow velocity were varied. The paper presents the segregation patterns of the particle phases obtained from the simulations. When the fraction of large particles was 50{\%} or larger, large particles segregated, as expected, to the wall regions and to the bottom part of the riser. However, when the fraction of large particles was 10{\%}, an excess of large particles was found in the upper half of the riser. The explanation for this unexpected phenomenon was found in the distribution of the large particles between the slow clusters and the faster moving lean suspension.",
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booktitle = "Proceedings of the 20th International Conference on Fluidized Bed Combustion",

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Seppälä, M & Kallio, S 2009, CFD Modelling of particle mixtures in a 2D CFB. in Proceedings of the 20th International Conference on Fluidized Bed Combustion. Beijing, pp. 851-856, 20th International Conference on Fluidized Bed Combustion, Xi'an, China, 18/05/09.

CFD Modelling of particle mixtures in a 2D CFB. / Seppälä, Maiju; Kallio, Sirpa.

Proceedings of the 20th International Conference on Fluidized Bed Combustion. Beijing, 2009. p. 851-856.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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T1 - CFD Modelling of particle mixtures in a 2D CFB

AU - Seppälä, Maiju

AU - Kallio, Sirpa

PY - 2009

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N2 - The capability of Fluent 6.2.16 to simulate particle mixtures in a laboratory scale 2D circulating fluidized bed (CFB) unit has been tested. In the simulations, the solids were described as one or two particle phases. The loading ratio of small to large particles, particle diameters and the gas inflow velocity were varied. The paper presents the segregation patterns of the particle phases obtained from the simulations. When the fraction of large particles was 50% or larger, large particles segregated, as expected, to the wall regions and to the bottom part of the riser. However, when the fraction of large particles was 10%, an excess of large particles was found in the upper half of the riser. The explanation for this unexpected phenomenon was found in the distribution of the large particles between the slow clusters and the faster moving lean suspension.

AB - The capability of Fluent 6.2.16 to simulate particle mixtures in a laboratory scale 2D circulating fluidized bed (CFB) unit has been tested. In the simulations, the solids were described as one or two particle phases. The loading ratio of small to large particles, particle diameters and the gas inflow velocity were varied. The paper presents the segregation patterns of the particle phases obtained from the simulations. When the fraction of large particles was 50% or larger, large particles segregated, as expected, to the wall regions and to the bottom part of the riser. However, when the fraction of large particles was 10%, an excess of large particles was found in the upper half of the riser. The explanation for this unexpected phenomenon was found in the distribution of the large particles between the slow clusters and the faster moving lean suspension.

KW - particle mixtures

KW - CFD

KW - 2D

KW - hydrodynamics

KW - CFB

M3 - Conference article in proceedings

SN - 978-7-302-20146-5

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BT - Proceedings of the 20th International Conference on Fluidized Bed Combustion

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Seppälä M, Kallio S. CFD Modelling of particle mixtures in a 2D CFB. In Proceedings of the 20th International Conference on Fluidized Bed Combustion. Beijing. 2009. p. 851-856