TY - JOUR
T1 - Particle velocity and flow development in a long and high-flux circulating fluidized bed riser
AU - Pärssinen, J. H.
AU - Zhu, J. X.
N1 - Funding Information:
Financial support from the Natural Sciences and Engineering Research Council of Canada is greatly acknowledged. J.H.P would also like to acknowledge the scholarship provided by Neste Research Foundation. The pilot was designed by J. Bu and constructed by J. Wen and C. Cook. The help from A. Trikha, H. Zhang, A. Yan, J. Ball, S. Manyele and S. Bodin is greatly acknowledged.
PY - 2001/9/20
Y1 - 2001/9/20
N2 - In a 10 m tall and 76 mm i.d. high-flux riser, radial profiles of particle velocities were determined with a five-fiber optic probe on seven axial levels, with solids circulation rate (solids flux) up to 550 kg/m2s and superficial gas velocity up to 10 m/s. This study shows a more comprehensive set of radial profiles under higher fluxes than any previous literature. Four axial stages of flow development were distinguished based on radial distributions of particle velocity and concentration. Compared to low-flux operations ( < 200 kg/m2s), the radial profiles of particle velocity are significantly less uniform at high-flux operations ( > 300 kg/m2s). The superficial gas velocity has more influence on the radial velocity profiles than the solids flux at high solids flux. Net solids downflow only occurs near the wall under limited conditions in the bottom section.
AB - In a 10 m tall and 76 mm i.d. high-flux riser, radial profiles of particle velocities were determined with a five-fiber optic probe on seven axial levels, with solids circulation rate (solids flux) up to 550 kg/m2s and superficial gas velocity up to 10 m/s. This study shows a more comprehensive set of radial profiles under higher fluxes than any previous literature. Four axial stages of flow development were distinguished based on radial distributions of particle velocity and concentration. Compared to low-flux operations ( < 200 kg/m2s), the radial profiles of particle velocity are significantly less uniform at high-flux operations ( > 300 kg/m2s). The superficial gas velocity has more influence on the radial velocity profiles than the solids flux at high solids flux. Net solids downflow only occurs near the wall under limited conditions in the bottom section.
KW - Circulating fluidized bed
KW - Five-fiber optic probe
KW - High solids circulation rate
KW - Radial particle velocity profile
UR - http://www.scopus.com/inward/record.url?scp=0035921784&partnerID=8YFLogxK
U2 - 10.1016/S0009-2509(01)00200-7
DO - 10.1016/S0009-2509(01)00200-7
M3 - Article
AN - SCOPUS:0035921784
SN - 0009-2509
VL - 56
SP - 5295
EP - 5303
JO - Chemical Engineering Science
JF - Chemical Engineering Science
IS - 18
ER -