Using computational fluid dynamics to calculate transversal dispersion in a structured packed bed

Coen Van Gulijk

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Structured packed beds filled with catalyst pellets are very useful reactors for heterogeneous or catalytic reactive distillation. The scope is to determine hydrodynamics of liquid in this kind of packing using CFD techniques to eventually describe scale up properties. First a simplifying model, the Toblerone model, is developed. This model simplifies the problem of multiphase flow in structured packed beds to single phase flow in intersecting triangular channels. The model gives an operation window for reactor operation and is a powerful tool to determine design properties. The liquid flow field is solved using the Ergun equation to account for porous flow trough the pellets. In this article the transversal dispersion coefficient is calculated with the Toblerone model. Using this technique it was found that the transversal dispersion coefficient is a factor 40 higher compared to single phase packed bed flow. This number is a reminder that transversal dispersion of the liquid phase in structured packed beds is never the limiting property with design.

LanguageEnglish
PagesS767-S770
Number of pages4
JournalComputers and Chemical Engineering
Volume22
Issue numberSUPPL.1
DOIs
Publication statusPublished - 15 Mar 1998
Externally publishedYes

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Packed beds
Computational fluid dynamics
Liquids
Reactor operation
Multiphase flow
Distillation
Flow fields
Hydrodynamics
Catalysts

Cite this

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abstract = "Structured packed beds filled with catalyst pellets are very useful reactors for heterogeneous or catalytic reactive distillation. The scope is to determine hydrodynamics of liquid in this kind of packing using CFD techniques to eventually describe scale up properties. First a simplifying model, the Toblerone model, is developed. This model simplifies the problem of multiphase flow in structured packed beds to single phase flow in intersecting triangular channels. The model gives an operation window for reactor operation and is a powerful tool to determine design properties. The liquid flow field is solved using the Ergun equation to account for porous flow trough the pellets. In this article the transversal dispersion coefficient is calculated with the Toblerone model. Using this technique it was found that the transversal dispersion coefficient is a factor 40 higher compared to single phase packed bed flow. This number is a reminder that transversal dispersion of the liquid phase in structured packed beds is never the limiting property with design.",
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Using computational fluid dynamics to calculate transversal dispersion in a structured packed bed. / Van Gulijk, Coen.

In: Computers and Chemical Engineering, Vol. 22, No. SUPPL.1, 15.03.1998, p. S767-S770.

Research output: Contribution to journalArticle

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