Computational fluid dynamics simulation of hydrodynamics and chemical reaction in a CFB downer

Li, Wenbin; Yu, Kun; Liu, Botan; Yuan, Xin

doi:10.1016/j.powtec.2014.09.026

Cited by 29 publications

(8 citation statements)

References 42 publications

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“…The advantages of a downer reactor are good mass and heat transfer characteristics, uniform radial ow patterns, less gas and solid back-mixing, short residence time, and a narrow residence time distribution. [1][2][3] This type of reactor has been applied to many gas-solid processes, including ozone decomposition 4 and pyrolysis of biomass. 5,6 Additionally, downer reactors offer the advantage of fast reaction time with an intermediate as the desired product, for example, a uid catalytic cracking reaction.…”

Section: Introductionmentioning

confidence: 99%

“…Two-fluid models have been developed to predict the flow behavior and the chemical performance of a reactive flow fluidized bed. Li et al 4 proposed turbulence models for the gas−solid turbulent flow and turbulent mass transfer in a catalytic ozone decomposition CFB downer. The axial and radial distributions of ozone concentration and solid volume fraction were used to validate the models.…”

Section: Introductionmentioning

confidence: 99%

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Scaling of a catalytic cracking fluidized bed downer reactor based on computational fluid dynamics simulations

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scaling of a catalytic cracking fluidized bed downer reactor based on computational fluid dynamics simulations

et al. 2020

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“…This first‐order reaction has an insignificant heat effect . All these advantages make this reaction a suitable reaction model to investigate the performance of gas‐solid CFBRs …”

Section: Introductionmentioning

confidence: 99%

“…[32] All these advantages make this reaction a suitable reaction model to investigate the performance of gas-solid CFBRs. [29,[33][34][35][36][37][38][39][40][41][42][43][44][45] Coupling reactions and hydrodynamics are necessary to predict the performance of CFBRs. Prevalent approaches to solve the equations describing a process unit include equation-oriented simulation (EOS) and sequential modular simulation (SMS).…”

mentioning

confidence: 99%

Sequential modular simulation of circulating fluidized bed reactors

2020

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Bypassing the mathematical complexity of equation‐oriented approaches in predicting the performance of chemical reactors has recently stimulated a significant amount of interest. Among chemical reactors, circulating fluidized bed reactors (CFBRs) have secured an important role in a broad range of applications in energy sectors due to their advantages, including high fluid‐solid contact efficiency, uniform temperature, and enhanced heat and mass transfer rates. Accordingly, modelling and predicting the performance of these reactors is of great importance. In this study, a sequence‐based model was developed to predict the behaviour of CFBRs. Complex phenomena in CFBRs were mimicked by two sub‐models, namely the hydrodynamics module, which addressed the physical changes, and the reaction kinetics module, which described the chemical evolution of species. The performance of the proposed model was validated with a library of catalytic ozone decomposition experimental data in CFBRs. This work introduces a new infrastructure for modelling CFBRs, which may be combined with the current process simulation software, such as Aspen Plus©, for advanced process modelling applications.

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“…The computational particle fluid dynamics (CPFD) numerical method is considered to be a more powerful tool for the simulation of large gas-solid two-phase flow system. It has been used for analyzing various gas-solid systems in recent years, considering that its multiphase flow model was developed incorporating dense phase, dilute phase, and packing particles algorithm for reducing computation [17,18,19].Q. Wang et al [20,21] simulated the gas solid flow in a circulating fluidized bed (CFB) with a loop seal.…”

Section: Introductionmentioning

confidence: 99%

Simulation of oil shale semi-coke particle cold transportation in a spouted bed using CPFD method

Zhang

Wang

et al. 2016

Powder Technology

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Abstract：The spouted bed was widely used due to its good mixing of particles and effective phase transferability between the gas and solid phase. In this paper, the transportation process of particles in a 3D spouted bed was studied using the Computational Particle Fluid Dynamics (CPFD) numerical method. Experiments were conducted to verify the validity of the simulation results. Distributions of the pressure, velocities and particle concentration of transportation devices were investigated. The motion state and characteristics of multiphase flows in the transportation device were demonstrated under various operating conditions. The results showed that a good consistency was obtained between the simulated results and the experimental results. The motion characteristics of the gas-solid two-phase flow in the device was effectively predicted, which could assist the optimal operating condition estimation for the spouted transportation process.

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Computational fluid dynamics simulation of hydrodynamics and chemical reaction in a CFB downer

Cited by 29 publications

References 42 publications

Scaling of a catalytic cracking fluidized bed downer reactor based on computational fluid dynamics simulations

Scaling of a catalytic cracking fluidized bed downer reactor based on computational fluid dynamics simulations

Sequential modular simulation of circulating fluidized bed reactors

Simulation of oil shale semi-coke particle cold transportation in a spouted bed using CPFD method

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