Influence of zone formation on stability of continuous fluidized bed layering granulation with external product classification--颗粒学报PARTICUOLOGY

Dreyschultze, C., Neugebauer, C., Palis, S., Bück, A., Tsotsas, E., Heinrich, S., & Kienle, A. (2015). Influence of zone formation on stability of continuous fluidized bed layering granulation with external product classification. Particuology, 23, 1-7. https://doi.org/10.1016/j.partic.2015.02.004

Influence of zone formation on stability of continuous fluidized bed layering granulation with external product classification

C. Dreyschultze ^a, C. Neugebauer ^b, S. Palis ^a, A. Bück ^a, E. Tsotsas ^a, S. Heinrich ^c, A. Kienle ^{a b *}

a Otto von Guericke University, Universitätsplatz 2, D-39106 Magdeburg, Germany
b Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstraße 1, D-39106 Magdeburg, Germany
c Hamburg University of Technology, Denickestraße 15, D-21073 Hamburg, Germany

10.1016/j.partic.2015.02.004

Volume 23, December 2015, Pages 1-7

Received 15 October 2014, Revised 17 February 2015, Accepted 28 February 2015, Available online 27 May 2015, Version of Record 2 December 2015.

E-mail: kienle@mpi-magdeburg.mpg.de

Highlights

• Stability of fluidized bed spray granulation processes is influenced by zone formation.

• Stability was studied for a wide range of possible process configurations and operating conditions.

• The corresponding model was formulated and analyzed theoretically.

• Results were validated by dynamic simulation.

Abstract

Continuous fluidized bed layering granulation with external product classification and a sieve-mill cycle can show instability in the form of self-sustained nonlinear oscillations of the particle size distribution. In the present study, the stability and bifurcation analysis of this process is presented. The underlying process models explicitly account for compartmentalization of the fluidized bed into a granulation and a drying zone, which is an important feature of many technical processes. Implications for plant operations are discussed with the help of stability diagrams as a function of zone size, residence time within different zones, the addition of external seeds and particular properties of the sieve-mill cycle.

Graphical abstract

Keywords

Fluidized bed; Granulation; Population balance; Stability; Bifurcation

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