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Licensed Unlicensed Requires Authentication Published by De Gruyter September 5, 2019

Simulation of Particle Mixing and Separation in Multi-Component Fluidized Bed Using Eulerian-Eulerian Method: A Review

  • Yong Zhang EMAIL logo , Zhenzhen Ran , Baosheng Jin , Youwei Zhang , Chunlei Zhou and Farooq Sher

Abstract

In practical engineering applications, the mixing and separation behavior of multi-component particles is importance to the fluidized bed operation. The development of many practical processes is inseparable from the knowledge of particle mixing and separation, such as material processing of ash-soluble coal gasification, multi-phase flow in boilers, and petrochemical catalytic processes. In recent years, due to the obvious advantages of the Eulerian–Eulerian model, many researchers at home and abroad have used it to study the mixing and separation behavior of particles. The paper reviews the use of Eulerian–Eulerian model to study the mixing and separation of multi-component particles in fluidized beds. The Eulerian–Eulerian model describes the gas-phase and each of the individual particles as continuums. The mechanism of particle mixing and separation, the influence of different factors on the particle mixing and separation including differences in particle size and density, the differences in apparent air velocity, the differences in model factors are discussed. Finally, an outlook for the use of Eulerian–Eulerian model to study the mixing and separation behavior of three component particles and related research on the drag model between particles.

Abbreviations

dp

Particle diameter

db

Bubble diameter

umf

Minimum fluidization gas velocity (m/s)

G

Gravity acceleration (m/s2)

ub

Average velocity of bubbles

xi

Fluid-free volume fraction of its solid species defined as [Vsi/Vst]

uff

Full fluidization velocity of binary mixtures (m/s)

Vb

Volume fraction of RE2 in particle mixtures

ug

Inlet gas superficial velocity

epp

Particle-particle restitution coefficient

epw

Particle-wall restitution coefficient

φ

Specularity coefficient

βpl − ps

Large solid-small solid drag force

βg − ps

Gas-small solid drag force

βg − pl

Gas-large solid drag force

μpl

Large solid viscosity

μps

Small solid viscosity

Gpl

Large solid gravity

Gps

Small solid gravity

Vg

Lift force

Vpl

Large solid lift force

Vps

Small solid lift force

Acknowledgements

The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (Grant No. 51390492), A Foundation for the Author of National Excellent Doctoral Dissertation of PR China (201440) and the Fundamental Research Funds for the Central Universities. The authors also acknowledge the provision of a scholarship to Yong Zhang by the China Scholarship Council (CSC) that enabled him to carry out part of the reported work at the University of Nottingham.

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Article note

The authors declare no competing financial interest.


Received: 2019-04-01
Revised: 2019-07-17
Accepted: 2019-07-27
Published Online: 2019-09-05

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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