Particle cross-flow, lateral momentum flux and lateral velocity in a circulating fluidized bed

Authors

  • J. Zhou,

    1. Department of Chemical Engineering, University of British Columbia, 2216 Main Mall, Vancouver, B.C., Canada V6T 1Z4
    Search for more papers by this author
  • J. R. Grace,

    Corresponding author
    1. Department of Chemical Engineering, University of British Columbia, 2216 Main Mall, Vancouver, B.C., Canada V6T 1Z4
    • Department of Chemical Engineering, University of British Columbia, 2216 Main Mall, Vancouver, B.C., Canada V6T 1Z4
    Search for more papers by this author
  • C. J. Lim,

    1. Department of Chemical Engineering, University of British Columbia, 2216 Main Mall, Vancouver, B.C., Canada V6T 1Z4
    Search for more papers by this author
  • C. M. H. Brereton,

    1. Department of Chemical Engineering, University of British Columbia, 2216 Main Mall, Vancouver, B.C., Canada V6T 1Z4
    Search for more papers by this author
  • S. Qin,

    1. Department of Chemical Engineering, University of British Columbia, 2216 Main Mall, Vancouver, B.C., Canada V6T 1Z4
    Current affiliation:
    1. Institute of Chemical Metallurgy, Chinese Academy of Science, P.O. Box 353, Beijing 100080, People's Republic of China
    Search for more papers by this author
  • K. S. Lim

    1. Department of Chemical Engineering, University of British Columbia, 2216 Main Mall, Vancouver, B.C., Canada V6T 1Z4
    Search for more papers by this author

Abstract

Lateral and axial profiles of solids cross-flow flux were measured in a circulating fluidized bed riser of square cross-section with a sampling probe. The solids cross-flow flux was found to be higher near the wall, especially near the corners, and lower in the core of the riser. The net solids horizontal flux was outwards in the lower part of the riser and inwards near the top.

The lateral solids momentum flux, measured by means of a piezoelectric probe, increased with height and then decreased near the top of the riser. The lateral solids momentum flux first increased with distance from the axis and then decreased towards the wall. It was especially low near the corners.

Abstract

Les profils latéral et axial de flux d'écoulement transversal de solides ont été mesurés à l'aide d'une sonde d'échantillonnage dans une colonne montante à lit fluidisé de section carrée. On a trouvé que le flux d'écoulement de solides transversal était plus élevé près de la paroi, en particulier dans les coins, et plus faible au centre de la colonne. Le flux de solides horizontal net est dirigé vers l'extérieur en bas de la colonne et vers l'intérieur dans la partie supérieure.

Le flux de quantité de mouvement de solides latéral, mesuré à l'aide d'une sonde piézoélectrique, augmente avec la hauteur puis diminue dans la partie supérieure de la colonne, Le flux de moment de solides latéral augmente d'abord avec la distance par rapport à l'axe pour diminuer ensuite vers la paroi; il est particulièrement faible dans les coins.

Ancillary