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Behaviour and removal of fine particles in a liquid‐solid spouted bed consisting of binary mixtures
Author(s) -
Ishikura T.,
Tanaka I.
Publication year - 1992
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.5450700508
Subject(s) - elutriation , dimensionless quantity , freeboard , entrainment (biomusicology) , mechanics , settling , materials science , chromatography , thermodynamics , chemistry , fluidized bed , physics , rhythm , acoustics
In a liquid‐solid spouted bed system containing coarse and fine particles, the entrainment and elutriation of the separated fines were investigated with reference to variations in the pressure drop through the bed. The effect of operating parameters on the velocity corresponding to the beginning of entrainment of fines ( U be ) was examined and a dimensionless correlation was proposed. The effect of operating parameters on the elutriation rate coefficient of fines at liquid velocities larger than their terminal settling velocity ( U l ) also was studied. An empirical equation was proposed for a column height above TDH , the height of freeboard at which the elutriation rate becomes constant. It was recognized that the elutriation phenomenon was closely related to the length of the stratified particle transport bed when the ascending velocity of the elutriable particles at the top of bed becomes constant.