Comparison of the standard Euler–Euler and hybrid Euler–Lagrange approaches for modeling particle transport in a pilot-scale circulating fluidized bed--颗粒学报PARTICUOLOGY

Adamczyk, W. P., Klimanek, A., Białecki, R. A., Węcel, G., Kozołub, P., & Czakiert, T. (2014). Comparison of the standard Euler–Euler and hybrid Euler–Lagrange approaches for modeling particle transport in a pilot-scale circulating fluidized bed. Particuology, 15, 129–137. https://doi.org/10.1016/j.partic.2013.06.008

Comparison of the standard Euler–Euler and hybrid Euler–Lagrange approaches for modeling particle transport in a pilot-scale circulating fluidized bed

Wojciech P. Adamczyk ^a *, Adam Klimanek ^a, Ryszard A. Białecki ^a, Gabriel Węcel ^a, Paweł Kozołub ^a, Tomasz Czakiert ^b

a Institute of Thermal Technology, Silesian University of Technology, 44-100 Gliwice, Konarskiego 22, Poland
b Institute of Advanced Energy Technologies, Czestochowa University of Technology, Czestochowa, Poland

10.1016/j.partic.2013.06.008

Volume 15, August 2014,, Pages 129-137

Received 10 March 2013, Revised 13 May 2013, Accepted 1 June 2013, Available online 11 September 2013.

E-mail: wojciech.adamczyk@polsl.pl

Highlights

• Euler–Euler and hybrid Euler–Lagrange approaches were used for modeling CFB.

• Time averaged results were compared against experimental data.

• 3D CFB geometry was used in simulations.

• Influence of the 3D geometrical model simplifications was investigated.

Abstract

Particle transport phenomena in small-scale circulating fluidized beds (CFB) can be simulated using the Euler–Euler, discrete element method, and Euler–Lagrange approaches. In this work, a hybrid Euler–Lagrange model known as the dense discrete phase model (DDPM), which has common roots with the multiphase particle-in-cell model, was applied in simulating particle transport within a mid-sized experimental CFB facility. Implementation of the DDPM into the commercial ANSYS Fluent CFD package is relatively young in comparison with the granular Eulerian model. For that reason, validation of the DDPM approach against experimental data is still required and is addressed in this paper. Additional difficulties encountered in modeling fluidization processes are connected with long calculation times. To reduce times, the complete boiler models are simplified to include just the combustion chamber. Such simplifications introduce errors in the predicted solid distribution in the boiler. To investigate the consequences of model reduction, simulations were made using the simplified and complete pilot geometries and compared with experimental data. All simulations were performed using the ANSYSFLUENT 14.0 package. A set of user defined functions were used in the hybrid DDPM and Euler–Euler approaches to recirculate solid particles.

Graphical abstract

Keywords

Particle; Multiphase flow; CFD; Particulate processes; CFB; Fluidized bed

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