CPFD simulation of fluidized bed flow in FCC regenerator

Cha, Baekdong; Kim, Junghwan; Son, Sung Real; Park, Deuk Soo; Moon, Il

doi:10.1016/b978-0-444-59520-1.50089-0

Cited by 11 publications

(3 citation statements)

References 8 publications

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“…Parcel of particles are defined in CPFD scheme. In the parcel, particles share the same properties such as size, density, velocity, etc.. With this definition of parcel, the commercial gas-solid systems with large number of particles can be represented by a relatively small number of parcels, which can significantly improve the computational efficiency [9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effects of the riser exit geometries on the hydrodynamics and solids back-mixing in CFB risers: 3D simulation using CPFD approach

Shi

Lan

et al. 2015

Powder Technology

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Section: Introductionmentioning

confidence: 99%

Effects of the riser exit geometries on the hydrodynamics and solids back-mixing in CFB risers: 3D simulation using CPFD approach

Shi

Lan

et al. 2015

Powder Technology

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“…The large-scale systems including billions of particles can be simulated with millions of numerical particles. Hence, CPFD modeling has been successfully applied in such industrial processes as particle sedimentation, fluidized beds, − coal gasification, ozone decomposition, downer reactors, , and a FCC regenerator . We have successfully applied the CPFD approach to investigate the hydrodynamics of gas–solids flow in a pilot CFB riser .…”

Section: Introductionmentioning

confidence: 99%

“…Hence, CPFD modeling has been successfully applied in such industrial processes as particle sedimentation, 25 fluidized beds, 26−29 coal gasification, 30 ozone decomposition, 31 downer reactors, 32,33 and a FCC regenerator. 34 We have successfully applied the CPFD approach to investigate the hydrodynamics of gas−solids flow in a pilot CFB riser. 27 On the basis of the previous work, CPFD modeling will be applied to investigate the back-mixing behavior of particles in that riser.…”

Section: Introductionmentioning

confidence: 99%

Solids Back-mixing Behavior and Effect of the Mesoscale Structure in CFB Risers

Lan

Shi

Zhang

et al. 2013

Ind. Eng. Chem. Res.

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Solids back-mixing significantly influences the performance of circulating fluidized bed (CFB) risers. A better understanding of the solids back-mixing behavior is greatly essential for the design and operation of CFB risers. Computational particle fluid dynamics (CPFD) modeling based on the multiphase particle-in-cell (MP-PIC) method was applied to investigate the solids back-mixing behavior and its influencing factors in CFB risers operating in dilute phase transport (DPT) and fast fluidization (FF) regimes. The present work observed extremely long residence time and wide residence time distribution (RTD) curves for particles in the FF regime, indicating an extensive back-mixing of particles in the FF regime. The overall and local backmixing behaviors of solids were further analyzed. The particles in the DPT regime have a little back-mixing in the lower part of the riser, while the particles in the FF regime experience a large-scale back-mixing throughout the riser. In addition, the factors influencing the back-mixing behavior of solids in different flow regimes were investigated. The results demonstrate that the solids back-mixing in the DPT regime is caused by the downward flow of particles near the wall region, while the severe back-mixing in the FF regime is due to the downflow particles and mesoscale structures (mainly particle clusters). The dynamic formation and dissolution of mesoscale structures could be the dominating factor, leading to the intense back-mixing for particles in the FF regime.

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