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PEPT Study of Particle Cycle and Residence Time Distributions in a Wurster Fluid Bed

Liang Li (Institutionen för kemi och kemiteknik, Kemisk apparatteknik) ; Anders Rasmuson (Institutionen för kemi och kemiteknik, Kemisk apparatteknik) ; A. Ingram ; M. Johansson ; J. Remmelgas ; C. von Corswant ; S. Folestad
AIChE Journal (0001-1541). Vol. 61 (2015), 3, p. 756-768.
[Artikel, refereegranskad vetenskaplig]

Particle cycle and residence time distributions are critical factors in determining the coating quality in the Wurster process. Positron emission particle tracking experiments are performed to determine the cycle and residence times of particles in different regions of a Wurster fluid bed. The results show that particles tend to recirculate in and sneak out below from the Wurster tube. The experiments also show that a larger batch size leads to a shorter cycle time and a narrower cycle time distribution (CTD). It is possible to avoid recirculations and obtain a shorter cycle time and a narrower CTD by selecting the operating conditions appropriately or via equipment design. Experiments using binary mixtures of particles with a diameter ratio of 1.5 show that large particles have a longer cycle time than small particles and that the cycle time is shorter for mixtures with approximately equal amounts of small and large particles.

Nyckelord: fluid bed, coating, cycle time, residence time distribution, positron emission particle tracking



Denna post skapades 2015-03-26. Senast ändrad 2016-04-22.
CPL Pubid: 214367

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Kemisk apparatteknik

Ämnesområden

Kemiteknik

Chalmers infrastruktur