Effects of the plenum chamber volume and distributor geometry on fluidized bed hydrodynamics--颗粒学报PARTICUOLOGY

Vakhshouri, K., & Grace, J. R. (2010). Effects of the plenum chamber volume and distributor geometry on fluidized bed hydrodynamics. Particuology, 8(1), 2–12. https://doi.org/10.1016/j.partic.2009.05.005

Effects of the plenum chamber volume and distributor geometry on fluidized bed hydrodynamics

Kiarash Vakhshouri, John R. Grace^*

Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, Canada V6T 1Z3

10.1016/j.partic.2009.05.005

Volume 8, Issue 1, February 2010, Pages 2-12

Received 27 March 2009, Accepted 15 May 2009, Available online 3 October 2009.

E-mail: jgrace@chml.ubc.ca

Highlights

Abstract

Most hydrodynamic fluidized bed models, including CFD codes, neglect any effects of the plenum chamber volume. Experiments were performed in a 0.13 m ID fluidization column to determine plenum chamber volume effects on fluidized bed hydrodynamics for FCC and glass particles. Two low-pressure-drop distributors were used, one with a single orifice, and the other with 33 orifices and the same total open area as the single orifice. The results show two peaks in the frequency spectra for the single-orifice distributor, one representing bubble eruption at the bed surface and the other of higher frequency corresponding to the bubbling frequency at the distributor. The latter decreased slightly with increasing plenum volume and with increasing bed depth. For the multi-orifice distributor, broad frequency spectra from pressure measurements became narrower and moved towards higher frequency with decreasing plenum volume.

Graphical abstract

Keywords

Fluidization; Bubble; Distributor; Plenum chamber; Hydrodynamics; Pressure drop

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