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

• Published in: Particuology Vol. 11; no. 6; pp. 636 - 646
• Main Authors: Yang, Chunzhen, Duan, Yufeng, Hu, Haitao
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2013
• Subjects: Clusters; Computer simulation; DEM模型; Density; Discrete element method; Dispersions; Dual legs; Fluidized bed; Fluidized beds; Fluidizing; Inventories; OpenGL; Power spectrum density; Solid exchange; Stockpiling; 功率谱密度; 固体; 实验室规模; 应用; 流化床; 流化速度; Discrete element method; Power spectrum density; Dual legs; Solid exchange; Fluidized bed
• ISSN: 1674-2001; 2210-4291
• DOI: 10.1016/j.partic.2013.01.008

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 （APLR） 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 APLR was 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.