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Determination of liquid hold-up and flow distribution inside modular catalytic structured packings

Identifieur interne : 000D17 ( Main/Exploration ); précédent : 000D16; suivant : 000D18

Determination of liquid hold-up and flow distribution inside modular catalytic structured packings

Auteurs : Aurora Viva [Italie] ; Said Aferka [Belgique] ; Dominique Toye [Belgique] ; Pierre Marchot [Belgique] ; Michel Crine [Belgique] ; Elisabetta Brunazzi [Italie]

Source :

Chemical engineering research & design [ 0263-8762 ] ; 2011.

RBID : Pascal:11-0365132

Descripteurs français

Pascal (Inist)
- Retenue liquide, Hydrodynamique, Champ écoulement, Garnissage rangé, Colonne garnissage, Réaction catalytique, Distribution temps séjour, Tomographie, Lit garnissage, Modélisation, Débit fluide.

English descriptors

KwdEn :
- Catalytic reaction, Flow field, Hydrodynamics, Liquid holdup, Modeling, Ordered packing, Packed bed, Packed column, Residence time distribution, Tomography.

Abstract

This paper presents the results of a study carried out to examine liquid hold-up and flow distribution in a 0.1 m internal diameter column filled with catalytic structured packing Katapak-SP. Information has been gathered at local scale by means of a non-intrusive high energy X-ray tomograph. Measurements have been carried out in a large number of packing cross sections situated at different heights between the top and bottom of the packed column, giving access to the evolution of axial profiles of liquid hold-up in the open channels (separation zone) and in the catalytic baskets (reaction zone) as a function of the liquid load. The total hold-up, evaluated by averaging local tomographic values over the packed volume, was compared with global hold-up data obtained by traditional methods, like draining and RTD measurements. A method was also proposed to deduce the distribution of liquid flowrate, between the reaction and the separation zones, from hold-up distribution measured by tomography. The methodology was validated by comparison with experimental data obtained by collecting separately the liquid flowing out of the two zones at the bottom of the packed bed. The obtained results are invaluable to improve the description of hydrodynamics in rate based performance models.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">This paper presents the results of a study carried out to examine liquid hold-up and flow distribution in a 0.1 m internal diameter column filled with catalytic structured packing Katapak-SP. Information has been gathered at local scale by means of a non-intrusive high energy X-ray tomograph. Measurements have been carried out in a large number of packing cross sections situated at different heights between the top and bottom of the packed column, giving access to the evolution of axial profiles of liquid hold-up in the open channels (separation zone) and in the catalytic baskets (reaction zone) as a function of the liquid load. The total hold-up, evaluated by averaging local tomographic values over the packed volume, was compared with global hold-up data obtained by traditional methods, like draining and RTD measurements. A method was also proposed to deduce the distribution of liquid flowrate, between the reaction and the separation zones, from hold-up distribution measured by tomography. The methodology was validated by comparison with experimental data obtained by collecting separately the liquid flowing out of the two zones at the bottom of the packed bed. The obtained results are invaluable to improve the description of hydrodynamics in rate based performance models.</div>
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Determination of liquid hold-up and flow distribution inside modular catalytic structured packings

Determination of liquid hold-up and flow distribution inside modular catalytic structured packings

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Descripteurs français

English descriptors

Abstract

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