Hydrodynamics of the reactor section in fluid cokers

The hydrodynamics of fluid cokers were studied in a pressurized fully cylindrical cold model scaled by matching key dimensionless groups so that the reactor sections of the commercial and laboratory units were geometrically and dynamically similar. Voidage distributions and solids flow structure wer...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Powder technology 2004-10, Vol.147 (1), p.126-136
Hauptverfasser: Song, Xuqi, Bi, Hsiaotao, Jim Lim, C., Grace, John R., Chan, Edward, Knapper, Brian, McKnight, Craig
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The hydrodynamics of fluid cokers were studied in a pressurized fully cylindrical cold model scaled by matching key dimensionless groups so that the reactor sections of the commercial and laboratory units were geometrically and dynamically similar. Voidage distributions and solids flow structure were investigated using optical fibre probes in a fluidized bed of FCC. The results show a relatively dense annular region, in which the time-average flow is downwards, surrounding a more dilute, upward flowing core region. However, the radial profiles of voidage indicate that the voidage increases gradually from the wall to the axis of the column, rather than showing a sharp transition between an annular and core region. Particles in the descending outer region are entrained by the feed jets into the core region. The radial position of the boundary between upward and downward net solids flow did not change significantly when the superficial gas velocity was varied.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2004.09.033