Validation and application of CPFD models in simulating hydrodynamics and reactions in riser reactor with Geldart A particles

Wu, Yingya; Li, Peng; Qin, Liqing; Wang, Min; Gao, Jinsen; Lan, Xingying

doi:10.1016/j.powtec.2017.10.003

Cited by 41 publications

(27 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this work, a cluster-based drag model, which was developed by Wu et al [30] considering the dynamic equilibrium of particles in and out of the cluster, and was used to simulate the CFB downer. On the other hand, the EMMS-based drag model, considering the effects of local heterogeneous structure, have been proven to predict the flow structures in CFB risers more accurately than the conventional homogeneous drag model (e.g., Wen and Yu or Gidaspow drag model) in previous studies [28,35,36]. Therefore, the EMMS-based drag model was selected to simulate the CFB riser.…”

Section: Cpfd Modelmentioning

confidence: 99%

“…For the particle phase, the wall boundary condition was described by normal-to-wall retention and tangent-to-wall retention parameters. The grid independency test had been conducted in the previous works of the authors' research group, and found that the simulation results were independent from the mesh size [28,30]. The detailed modeling parameters for simulating the downer and riser are shown in Table 1.…”

Section: Simulation Set-upmentioning

confidence: 99%

“…Lanza et al [26,27] presented studies to predict the flow behaviors in the developed flow region of a downer using CPFD approach. Wu et al [28] established a CPFD model coupled with EMMS-based drag model and predicted the flow behavior of a pilot-scale CFB riser handling Geldart A particles and of an industrial-scale FCC riser with a 14-lump kinetic model. Shi et al [29] investigated the solids residence time distribution and solids back-mixing behavior of a CFB riser by adopting CPFD approach and their results demonstrated that the CPFD approach was capable to obtain the residence time of each individual particle in a pilot-scale riser.…”

Section: Introductionmentioning

confidence: 99%

“…Shi et al [29] investigated the solids residence time distribution and solids back-mixing behavior of a CFB riser by adopting CPFD approach and their results demonstrated that the CPFD approach was capable to obtain the residence time of each individual particle in a pilot-scale riser. With CPFD approach, the previous studies of the authors' research group [28,30] succeeded in describing the flow behavior of CFB downer and riser respectively by considering the cluster effects on the interphase drag force. However, the above mentioned CPFD studies were all based on CPFD approach to simulate the individual downer or riser.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

3D CPFD Simulation of Circulating Fluidized Bed Downer and Riser: Comparisons of Flow Structure and Solids Back-Mixing Behavior

Liu

Shi

et al. 2020

Processes

Self Cite

View full text Add to dashboard Cite

The difference of gas-solids flow between a circulating fluidized bed (CFB) downer and riser was compared by computational particle fluid dynamics (CPFD) approach. The comparison was conducted under the same operating conditions. Simulation results demonstrated that the downer showed much more uniform solids holdup and solids velocity distribution compared with the riser. The radial non-uniformity index of the solids holdup in the riser was over 10 times than that in the downer. In addition, small clusters tended to be present in the whole downer, large clusters tended to be present near the wall in riser. It was found that the different cluster behavior is important in determining the different flow behaviors of solids in the downer and riser. While the particle residence time increased evenly along the downward direction in the downer, particles with both shorter and longer residence time were predicted in the whole riser. The nearly vertical cumulative residence time distribution (RTD) curve in the downer further demonstrated that the solids back-mixing in the downer is limited while that in the riser is severe. Solids turbulence in the downer was much weaker compared with the riser, while the large clusters formation near the wall in the riser would hinder solids transportation ability.

show abstract

Section: Cpfd Modelmentioning

confidence: 99%

Section: Simulation Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

3D CPFD Simulation of Circulating Fluidized Bed Downer and Riser: Comparisons of Flow Structure and Solids Back-Mixing Behavior

Liu

Shi

et al. 2020

Processes

Self Cite

View full text Add to dashboard Cite

show abstract

“…Zhang et al [8] investigated the mixing and segregation behavior of biomass particle in fluidized bed experimentally. Although many researchers had done a lot of research on the distribution characteristics of the regular particles [9][10][11][12][13], such as glass beads, quartz sand, relative characteristics study was scarcely concern about the particles of this special flexible ribbon type.…”

Section: Introductionmentioning

confidence: 99%

A Method for Analyzing the Radial Distribution of Flexible Ribbon Particles and Cluster in a Fluidized Bed Riser

Wu¹,

Li²,

Yuan³

2018

World Congress on Mechanical, Chemical, and Material Engineering

View full text Add to dashboard Cite

Many biomass materials, such as herbage, tobacco leaf and seaweed are chopped into small strips and usually dried by fluidized bed dryer. These Flexible ribbon particles in the fluidized bed riser may have experienced a much more complicated process, such as heat & mass transfer, mixing and drying. They are easy to hold together due to the flexibility and the non-uniformity of ribbon shape. Thus, it is important to understand the distribution of this special particle and cluster in the riser. High-speed camera method has always been used in measurement. However, it is difficult to analyze the particle flow due to the overlaps of the flexible ribbon particle in the shot image. So this paper presented a new analyzing method in order to obtain more information of this special gas-solid flow. And the radial concentration distribution of flexible filamentous particle and cluster in gas-solid flow in were experimentally analyzed. It is found that the concentration distribution of the flexible filamentous cluster was completely different from that of the conventional spherical particles.

show abstract

Two‐Phase and Three‐Phase Modeling of an Industrial Fluidized Bed for Maximizing Iso‐Paraffins

Han

et al. 2022

Chemie Ingenieur Technik

View full text Add to dashboard Cite

The maximizing iso-paraffins (MIP) process is a new fluid catalytic cracking route to produce cleaner gasoline. Its major innovation is the diameter-transformed fluidized bed reactor which can be flexibly regulated to multiple distinct reaction zones. This study aims to accurately reveal complex behaviors in MIP reactor by two-phase modeling and three-phase modeling to extend its application. Both simulations of an industrial MIP reactor are compared in terms of solids and liquid concentration, temperature, coke content, gas velocity, and product yield. It is found the two-phase case is enough for predicting the region far away from the oil feedstock injection, and the other is the better choice especially in the first zone if the heat transfer model can be reasonably built.

show abstract

Validation and application of CPFD models in simulating hydrodynamics and reactions in riser reactor with Geldart A particles

Cited by 41 publications

References 33 publications

3D CPFD Simulation of Circulating Fluidized Bed Downer and Riser: Comparisons of Flow Structure and Solids Back-Mixing Behavior

3D CPFD Simulation of Circulating Fluidized Bed Downer and Riser: Comparisons of Flow Structure and Solids Back-Mixing Behavior

A Method for Analyzing the Radial Distribution of Flexible Ribbon Particles and Cluster in a Fluidized Bed Riser

Two‐Phase and Three‐Phase Modeling of an Industrial Fluidized Bed for Maximizing Iso‐Paraffins

Contact Info

Product

Resources

About