Application of CFD-DEM to the study of solid exchange in a dual-leg fluidized bed--颗粒学报PARTICUOLOGY

Yang, C., Duan, Y., & Hu, H. (2013). Application of CFD-DEM to the study of solid exchange in a dual-leg fluidized bed. Particuology, 11(6), 636–646. https://doi.org/10.1016/j.partic.2013.01.008

Application of CFD-DEM to the study of solid exchange in a dual-leg fluidized bed

Chunzhen Yang, Yufeng Duan^*, Haitao Hu

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

10.1016/j.partic.2013.01.008

Volume 11, Issue 6, December 2013, Pages 636-646

Received 13 September 2012, Revised 27 November 2012, Accepted 7 January 2013, Available online 7 June 2013.

E-mail: yfduan@seu.edu.cn

Highlights

• Solid exchange in a dual-leg fluidized bed was studied with CFD-DEM model.

• The simulated particle flow patterns are similar to the experimental data.

• Two dominant frequencies exist in PSD results.

• Higher fluidization velocity results in more intensive particles exchange between the two half beds.

• Cluster exchange frequency decreases with an increase of the bed inventory.

Abstract

The CFD-DEM model was developed to simulate solid exchange behavior between two half beds in a bench-scale two-dimensional dual-leg fluidized bed (DL-FB). Power spectrum density (PSD) analysis was applied to obtain the dominant frequency (F) of the simulated differential particle number (ΔP_LR) between the two half beds. Effects of fluidization velocity (u) and bed material inventory (H) on the solid exchange behavior were studied using the CFD-DEM model. Not only snapshots of the simulated particle flow patterns using the OpenGL code but also the dominant frequency of ΔP_LRwas similar to the experimental results. The simulation results show that higher fluidization velocity assists the exchange of more particles between the two half beds, but the dispersion of clusters on the bed surface into single particles decreases the cluster exchange frequency. A greater bed material inventory results in more intense cluster exchange. The cluster exchange frequency decreases with an increase of the bed material inventory.

Graphical abstract

Keywords

Dual legs; Fluidized bed; Solid exchange; Discrete element method; Power spectrum density

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