Print: | ISSN 0256-1115 |
Online: | ISSN 1975-7220 |
Korean Journal of Chemical Engineering,
Vol.31, No.11, 2094-2100, 2014 Entrainment of Geldart C particles in fluidized beds with binary particles
The effects were determined of the mass ratio of Geldart C particles on the total amount of particles (Mfine/Mtotal=0-50 wt%), superficial gas velocity (Ug=0.5-1.0 m/s) and coarse particle size distribution (mono, binary, flat, and Gaussian type) on entrainment of Geldart C particles in a bubbling fluidized bed with binary particles (coarse particles:dp=0.512 mm, ρs=2,339 kg/m3 and Geldart C particles: dp=13 μm, ρs=4,455 kg/m3). The initial entrainment rate increases with increasing Ug. At Ug of 0.5 and 0.7 m/s, the initial entrainment rate slightly increases initially and then remains almost constant with increasing mass ratio (Mfine/Mtotal). At higher gas Ug of 0.85 and 1.0 m/s, the initial entrainment rate increases with increasing the mass ratio (Mfine/Mtotal) up to 30 wt%, after which the increasing slope of the initial entrainment rate decreases with increasing the mass ratio (Mfine/Mtotal). Also, the decrease in the coefficient of entrainment rate is equal to the increase in (Mfine/Mtotal) at the corresponding Ug. The average particle size of the entrained particles is about 12-16 μm at Ug of 0.5-1.0 m/s.
Keywords:
Coarse Particle; Geldart C Particle; Fluidized Bed; Entrainment Rate Constant; Entrainment Rate
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