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.
Determination of liquid hold-up and flow distribution inside modular catalytic structured packings
BRUNAZZI, ELISABETTA
Ultimo
2011-01-01
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.File | Dimensione | Formato | |
---|---|---|---|
Cherd2011_vivaetal.pdf
solo utenti autorizzati
Descrizione: Articolo principale
Tipologia:
Versione finale editoriale
Licenza:
NON PUBBLICO - Accesso privato/ristretto
Dimensione
1.89 MB
Formato
Adobe PDF
|
1.89 MB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Cherd2011DA_accepted.pdf
Open Access dal 01/09/2012
Descrizione: articolo principale in versione post-print
Tipologia:
Documento in Post-print
Licenza:
Creative commons
Dimensione
796.93 kB
Formato
Adobe PDF
|
796.93 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.