Determination of minimum fluidization velocity in fluidized bed at elevated pressures and temperatures using CFD simulations

Yingjuan Shao, Jinrao Gu, Wenqi Zhong, Aibing Yu

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)

Abstract

The minimum fluidization velocity of particles is one of the most critical parameters for the design and operation of fluidized beds. It is difficult and expensive to experimentally measure this parameter at elevated pressures and temperatures. In this study, a three-dimensional model based on Eulerian−Lagrangian frames was used to predict the minimum fluidization velocity at elevated pressures and temperatures. The solid phase was simulated using the multi-phase particle-in-cell approach. The particle flow was described using the discrete particle approach, and a large eddy simulation was conducted to predict the turbulent gas motion. The simulation results were compared with the experimental data reported in previous literatures. The bed temperature ranged from 25 to 800 °C, and the operating pressure ranged from 0.1–4 MPa. In general, the minimum fluidization velocity decreased as the temperature and pressure increased. The variation trends were not significant at high temperatures and pressures (greater than 600 °C and 2 MP, respectively). With a decrease in the particle density, the minimum fluidization velocity decreased. With an increase in the particle size, the minimum fluidization velocity increased. Moreover, the influence of the particle size distribution on the minimum fluidization velocity was systematically evaluated. To precisely calculate the minimum fluidization velocity at elevated temperatures and pressures, a correlation was proposed based on the simulation results.

Original languageEnglish
Pages (from-to)81-90
Number of pages10
JournalPowder Technology
Volume350
DOIs
Publication statusPublished - 15 May 2019

Keywords

  • Computational fluid dynamics
  • Eulerian–Lagrangian approach
  • Gas-solid flow
  • Minimum fluidization velocity

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