Experimental Quantification of the Lateral Mixing of Binary Solids in Bubbling Fluidized Beds

Huanan Li, Jikai Huang, Zhigang Liu, Mingming Lv and Can Ji
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Huanan Li: Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Jikai Huang: Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Zhigang Liu: Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Mingming Lv: Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Can Ji: Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China

Energies, 2021, vol. 14, issue 22, 1-25

Abstract: A novel experimental method for the lateral mixing of binary solids in bubbling fluidized beds was developed based on the capacitance probe technique. The evolutions of local mixing ratios in a fluidized bed which can be assumed as one mixing cell were analyzed in detail. The solids mixing within one mixing cell was resolved and the effect of convection and diffusion mechanism on lateral mixing was evaluated individually. The results show that at lower part of the fluidized bed, convection plays a more important role in the mixing process near the wall; meanwhile, diffusion is very important for the mixing around the center line. This is opposite with that at the higher part. A lateral micro dispersion coefficient was proposed to characterize the lateral mixing within the mixing cell and the value is generally between 0.005 and 0.025 m/s. A new mixing index was proposed to evaluate the lateral mixing quality of binary solids. It was found that at the lower part of the fluidized bed, the best mixing is acquired at the half radius, whereas mixing at the center line is the worst. At the higher part, solid mixing is better when increasing the distance from the wall. The influences of gas velocity and static bed on the lateral mixing were also discussed from a microscopic perspective.

Keywords: fluidized bed; lateral solids mixing; binary mixtures; capacitance probe (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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