Experimental study and modeling of particle drying in a continuously-operated horizontal fluidized bed--颗粒学报PARTICUOLOGY

Chen, K., Bachmann, P., Bück, A., Jacob, M., & Tsotsas, E. (2017). Experimental study and modeling of particle drying in a continuously-operated horizontal fluidized bed. Particuology, 34, 134-146. https://doi.org/10.1016/j.partic.2017.02.003

Experimental study and modeling of particle drying in a continuously-operated horizontal fluidized bed

Kaicheng Chen ^a *, Philipp Bachmann ^a, Andreas Bück ^a, Michael Jacob ^b, Evangelos Tsotsas ^a

a Thermal Process Engineering, Otto-von-Guericke-University, Universitätsplatz 2, 39106 Magdeburg, Germany
b Glatt Ingenieurtechnik GmbH, Nordstrasse 12, 99427 Weimar, Germany

10.1016/j.partic.2017.02.003

Volume 34, October 2017, Pages 134-146

Received 30 September 2016, Revised 17 January 2017, Accepted 2 February 2017, Available online 16 June 2017, Version of Record 12 August 2017.

E-mail: kaicheng.chen@ovgu.de

Highlights

• Particle residence time and residual moisture content distributions were measured.

• A two-dimensional horizontal fluidized bed drying model was proposed.

• Parametric studies of product status under different operation conditions were conducted.

Abstract

Multistage fluidized beds are frequently used for product drying in industry. One advantage of these fluidized beds is that they can achieve a high throughput, when operated continuously. In this study, γ-Al₂O₃ particles were dried in a pilot-scale horizontal fluidized bed, without considering any comminution effects. For each experiment, the particle moisture content distribution and residence time distribution were determined. To take into account particle back mixing in our experiments, a one-dimensional population balance model that considers particle residence time was introduced into a fluidized bed-drying model. Experimental particle residence time distributions were reproduced using a tank-in-series model. Subsequently, the moisture content distribution was implemented, as a second dimension to the population balance in this model. These two-dimensional simulations were able to describe the experimental data, especially the spread in the residual particle moisture distribution, much more accurately than one-dimensional simulations. Using this novel two-dimensional model, the effects of different operating parameters (process gas temperature, solid feed rate, superficial air velocity) on the particle moisture content distribution were systematically studied.

Graphical abstract

Keywords

Continuous drying; Horizontal fluidized bed; Residence time distribution; Moisture content distribution; Population balance

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