CFD Simulation of Mixing and Segregation of Binary Solid Mixtures in a Dense Fluidized Bed

Anicic, Bozidar; Lu, Bona; Lin, Weigang; Wu, Hao; Dam‐Johansen, Kim; Wang, Wei

doi:10.1002/cjce.23561

Cited by 5 publications

(3 citation statements)

References 34 publications

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“…Nevertheless, simplifications of the EMMS drag sometimes are still made for the simulation of binary gas−particle flows. For example, Anicic et al 35 neglected the effect of the presence of different types of particles and even used the same H d,EMMS for both particle phases. They claimed that the average physical properties of the two particles (glass/polystyrene) are similar.…”

Section: Model Equationsmentioning

confidence: 99%

Numerical Study on the Hydrodynamics of a Chemical Looping Combustion System with a Binary-Particle Mixture

Ren,

Zeng,

et al. 2023

Ind. Eng. Chem. Res.

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Chemical looping combustion (CLC) involving multicomponent particles is favorable for the purpose of capturing CO2 with a low energy penalty. While the complex flowing behavior in terms of mixing and segregation of particles makes it a challenge to have a deep understanding of hydrodynamics as well as its application. In this paper, a multifluid model based on the Eulerian–Eulerian approach is introduced for a three-dimensional (3D) simulation of the fluidization process in a chemical looping combustion system with binary particles consisting of heavy glass beads (GBs) and light polyethylene (PE) as two model metal oxides (i.e., oxygen carriers). The multifluid model integrates the k g – εg – k s – εs – Θ formulations for the description of turbulence flow and the EMMS drag for the interaction between particles and gas. With this model, the distributions of pressure and phase velocity as well as the solid circulation rate can be obtained. Also, satisfactory agreements are found between the predictions and experimental data, which validates the proposed model. It is observed that a higher fluidizing velocity in the air reactor (AR) and fuel reactor (FR) results in a higher solid circulation rate with less significant segregation. Increasing the diameter of heavy GB from 98 to 138 μm with a fixed PE diameter of 231 μm leads to a continuous intensification of the segregation behavior in AR and riser as well as FR, while the difference in values of averaged binary-mixture compositions (i.e., averaged light PE weight fraction) between AR and FR shows an inflection point where a relatively equal composition within the two reactors is reached when the GB diameter is 116 μm. Higher fluidizing velocity in loop seals just leads to a higher solid circulation rate, and it almost has no influence on the composition of binary particles in AR and FR, indicating a valve-like function of the loop seals.

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Section: Model Equationsmentioning

confidence: 99%

Numerical Study on the Hydrodynamics of a Chemical Looping Combustion System with a Binary-Particle Mixture

Ren,

Zeng,

et al. 2023

Ind. Eng. Chem. Res.

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“…[ 15–25 ] However, the sub‐grid models applied for polydispersed bubbling gas‐solid flow are still in their preliminary stages and there are still many problems to be settled in this area. [ 26–30 ]…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers have made attempts to extend the energy minimization multi‐scale (EMMS) drag model based on monodispersed gas‐solid systems to compute the binary gas‐solid systems. [ 26–30 ] Under the framework of the EMMS method, each phase contained two types of particles and surrounding fluidized media. The extended EMMS drag model enabled the pronounced movement of bubbles to be identified, and thus it predicts the segregation behaviour better than the conventional drag model.…”

Section: Introductionmentioning

confidence: 99%

Simulation of binary particle segregation for bubbling fluidized beds using polydispersed structure‐based drag model extended from a monodispersed model

Jia

Zou

et al. 2020

Can J Chem Eng

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A bubble structure‐based drag model developed for the monodispersed system has been extended to simulate bi‐dispersed bubbling fluidized beds. Both dense phase and dilute phase are considered to be comprised of two types of particles with different sizes. The derivation of the structure‐based drag coefficient for individual particle based on the force equilibrium principle is proved to be independent of the volume fractions (εsi) of particle i. The multi‐fluid model in the commercial software Ansys Fluent is employed to evaluate the polydispersed drag model for the segregation of binary gas‐particle flows in a bubbling fluidized bed. It is shown that the simulation results predicted by the new structure‐based drag model are in reasonable agreement with experimental data with a 6.34% root mean square error (RMSE). The new structure‐based model can capture the particle distribution at the top region of the fluidized bed well. The bubble behaviour can also be captured by the new model well.

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Catalytic Kinetics and CFD Simulation of Multi-Stage Combined Removal of Acrylonitrile Tail Gas

Liu

Yang

2021

Russ Phys J

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CFD Simulation of Mixing and Segregation of Binary Solid Mixtures in a Dense Fluidized Bed

Cited by 5 publications

References 34 publications

Numerical Study on the Hydrodynamics of a Chemical Looping Combustion System with a Binary-Particle Mixture

Numerical Study on the Hydrodynamics of a Chemical Looping Combustion System with a Binary-Particle Mixture

Simulation of binary particle segregation for bubbling fluidized beds using polydispersed structure‐based drag model extended from a monodispersed model

Catalytic Kinetics and CFD Simulation of Multi-Stage Combined Removal of Acrylonitrile Tail Gas

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