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Hydrodynamics of a powder‐particle spouted bed with bottom feeding of powders conveyed by spouting gas
Author(s) -
Nagashima Hiroshi,
Suzukawa Kazumi,
Ishikura Toshifumi
Publication year - 2013
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.21847
Subject(s) - slugging , elutriation , materials science , residence time (fluid dynamics) , particle size , particle (ecology) , pressure drop , fluidization , fluidized bed , waste management , chemistry , mechanics , geotechnical engineering , chemical engineering , geology , flow (mathematics) , engineering , physics , oceanography , organic chemistry
Hydrodynamics of a powder‐particle spouted bed (PPSB) with bottom feeding of fine powders conveyed by spouting gas has been investigated. Feeding of fine powders caused an increase in bed pressure drop, especially when a cohesive powder was fed. The minimum spouting velocity decreased with increasing feed rate of fines until a critical value, above which slugging occurred. Also, the fines became difficult to elutriate out of the PPSB when using a cohesive powder smaller than 40 µm. The elutriation rate constant and the mean residence time of fines in this study almost agreed with those obtained by top feeding.