Dispersion characteristics of dissimilar materials in a fluidized bed with unevenly distributed fluidizing air

Wang, Zibing; Zhang, Chunxia; Kang, Running; Wei, Xiaolin; Bin, Feng; Li, Teng; Li, Bo

doi:10.1016/j.powtec.2017.07.017

Cited by 1 publication

(1 citation statement)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This observation combines the effect of fluidization velocity and particle properties because the latter influences the minimum fluidization speed. We note in passing that in most mixing-related studies, ,,, a group of particles is colored upon initializing the process, that is, when particles are at rest and the fluidization speed is zero. However, it is questionable if such an approach is useful to study solid mixing rates in BFBs because of possible initialization and transition effect …”

Section: Introductionmentioning

confidence: 99%

Quantification of Solid Mixing in Bubbling Fluidized Beds via Two-Fluid Model Simulations

Salehi

Askarishahi

Radl

2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The influence of particle density and fluidization velocity on the mixing behavior of Geldart B particles was investigated in bubbling fluidized beds for various operating conditions using a two-fluid model approach. The simulation results proved that the predicted solid flow pattern for a wide range of Geldart B particles differs from particles of Geldart B/D classification at identical fluidization numbers. Quantitative analysis of the predicted solid velocity variances revealed that the solid axial dispersion rate is higher than the lateral one. In detail, a Peclet number of 1.54 and 3.92 was predicted for axial and lateral mixings, respectively. Also, the solid dispersion and diffusion coefficients were linearly correlated with the excess gas velocity for a range of particle properties. Finally, the characteristic global particle mixing times were computed. Thereby, the characteristic mixing time can be correlated with the particle Froude number, expanded bed height, and solid dispersion coefficient with high accuracy.

show abstract