鼓泡流化床异质颗粒混合特性微观研究

doi:10.3976/j.issn.1002-4026.2022.04.009

Abstract

Abstract:

A novel method for measuring the mixing characteristics of dissimilar particles in dense gas-solid two-phase flow based on a capacitance probe was developed. In the mixing process, the variation in the micromixing ratio of dissimilar particles in a bubbling fluidized bed was studied. The influence of convection and diffusion on the mixing of particles at a series of locations in the bubbling fluidized bed and its micromechanism were analyzed. Results show that with increasing bed height, the influence of convective mixing on the mixing of particles first increases and then decreases. The mixing ratio near the wall fluctuates slightly with the mixing time and mainly shows diffusion mixing behavior. No considerable difference is observed in the time required for particles to reach mixing equilibrium at different bed heights, and the time required for particles to reach mixing equilibrium near the wall is approximately twice as long as that at the axial positions. However, the final micromixing indices are similar in the mixing equilibrium state.

Key words: fluidized bed, dissimilar particles, particle mixing, bubble, capacitance probe

CLC Number:

TK175

LI Hua-nan, HUANG Ji-kai, DONG Kai-ming. Microstudy on mixing characteristics of dissimilar particles in bubbling fluidized beds[J].Shandong Science, 2022, 35(4): 68-76.

Figures/Tables 6

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References 29

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Microstudy on mixing characteristics of dissimilar particles in bubbling fluidized beds

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