Experimental and numerical study of pseudo-2D circulating fluidized beds--颗粒学报PARTICUOLOGY

Klimanek, A., Adamczyk, W., Kallio, S., Kozołub, P., Węcel, G., & Szlęk, A. (2016). Experimental and numerical study of pseudo-2D circulating fluidized beds. Particuology, 29, 48-59. https://doi.org/10.1016/j.partic.2015.09.009

Experimental and numerical study of pseudo-2D circulating fluidized beds

Adam Klimanek ^a *, Wojciech Adamczyk ^a, Sirpa Kallio ^b, Paweł Kozołub ^c, Gabriel Węcel ^a, Andrzej Szlęk ^a

a Institute of Thermal Technology, Silesian University of Technology, Konarskiego 22, 44-100 Gliwice, Poland
b VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044 VTT, Finland
c Amec Foster Wheeler, Staszica 31, 41-200 Sosnowiec, Poland

10.1016/j.partic.2015.09.009

Volume 29, December 2016, Pages 48-59

Received 3 April 2015, Revised 6 August 2015, Accepted 1 September 2015, Available online 8 January 2016, Version of Record 18 November 2016.

E-mail: adam.klimanek@polsl.pl

Highlights

• Experimental and numerical studies of pseudo-2D CFBs were performed.

• Measured pressure and solid volume fractions were compared with simulation results.

• Sensitivity of simulation results to mesh density was studied.

• Effects of particle size distribution and granular temperature formulation were examined.

• 3D effects were shown to be important in modeling of the pseudo-2D facility.

Abstract

We present experimental investigations and numerical simulations of a pseudo-2D riser. Experiments were performed for various airflow rates, particle types/diameters, and particle size distributions. Pressure distributions along the wall of the riser were measured. Additional measurements from a smaller pseudo-2D riser (Kallio et al., 2009; Shah et al., 2012) were used to analyze horizontal solids volume fraction profiles. The experimental data were compared with simulation results carried out using an Euler–Euler approach. A mesh sensitivity study was conducted for numerical simulations and effects associated with simplifying real 3D geometry to a 2D model were examined. In addition, the effect of using an algebraic equation to represent the granular temperature versus a full partial differential equation also was examined for numerical simulations. Results showed small but significant near-wall sensitivity of the flow variables to mesh size. Substantial differences in mean pressure, solids distribution, and solid velocities were obtained, when 2D and 3D simulation results were compared. Finally, applying the simplified granular temperature equation for turbulent fluidization and for dilute-phase transport can lead to incorrect predictions in models.

Graphical abstract

Keywords

Circulating fluidized bed; Euler–Euler approach; Gas–solid flow; Kinetic theory of granular flow; Particle size distribution; 2D vs 3D

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