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

Khongprom, Parinya; Ratchasombat, Supawadee; Wanchan, Waritnan; Bumphenkiattikul, Panut; Limtrakul, Sunun

doi:10.1039/c9ra10080f

Cited by 12 publications

(11 citation statements)

References 50 publications

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“…The details of four-lump mechanism model and kinetic data are summarized by Songip et al 46 and in our previous study. 22 …”

Section: Methodsmentioning

confidence: 99%

“…However, the horizontal Damköhler number cannot scale the combustion behavior, except in some special cases. In 2020, the scaling up of a catalytic cracking fluidized bed downer reactor was examined by Khongprom et al 22 The Damköhler number was modified for such a complex reaction mechanism. Chemical performance similarity was taken into account in terms of reactant conversion and mass fraction and selectivity of desired product (gasoline).…”

Section: Introductionmentioning

confidence: 99%

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Scaling of catalytic cracking fluidized bed downer reactor based on CFD simulations—Part II: effect of reactor scale

et al. 2022

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“…The details of four-lump mechanism model and kinetic data are summarized by Songip et al 46 and in our previous study. 22 …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scaling of catalytic cracking fluidized bed downer reactor based on CFD simulations—Part II: effect of reactor scale

et al. 2022

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“…In recent years, computational fluid dynamics (CFD) has been developed to solve the complex flow systems [17][18][19][20][21][22]. In this study, a two-fluid model based on the Eulerian-Eulerian approach was used to simulate flow behavior in a stirred tank.…”

Section: Mathematical Modelmentioning

confidence: 99%

Study of Hydrodynamics and Upscaling of Immiscible Fluid Stirred Tank using Computational Fluid Dynamics Simulation

Phumnok

Wanchan

Chuenjai

et al. 2022

CFDL

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Stirred tanks are prevalent in various industries, including chemical, biochemical, and pharmaceutical industries. These reactors are suitable for ensuring efficient mass and heat transfer because adequate mixing can be achieved. Numerous studies have been conducted on small-scale stirred-tank reactors. However, upscaling such reactors is challenging because of the complex flow behavior inside the system, especially for the mixing of immiscible liquid–liquid systems. Thus, the objectives of this study were to examine the flow behavior and upscale an immiscible liquid–liquid stirred tank using CFD simulation by investigating a flat-bottomed stirred tank reactor, equipped with a six-blade Rushton turbine. The simulated results were in good agreement with those obtained experimentally. The scale of the reactor significantly affects the hydrodynamic behavior, and the uniformity of the radial distribution of the velocity decreases with increasing Reynolds number. Furthermore, the upscaling criteria were evaluated for geometric similarity and equal mixing times. The proposed scaling law reliably scaled up the immiscible liquid–liquid mixing in a stirred tank with a difference in the range of ±10%.

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“…The turbulence model and multiphase flow model are selected as the evaluation model. Gas holdup and gas-liquid mass transfer can be obtained from the operation of wastewater treatment reactor, and these are the two critical factors in reducing energy consumption and improving efficiency [10]. The key research purpose of this experiment lies in whether the nondegradable substances in industrial sewage can be decomposed after the insertion of cross-shaped and funnel-shaped internals.…”

Section: Research On Improved Icfb With Cross-shaped and Funnel-shaped Internalsmentioning

confidence: 99%

Optimization of the Internal Circulating Fluidized Bed Using Computational Fluid Dynamics Technology

Du¹,

Liu²,

Sun³

2022

Fluid Dynamics &Amp; Materials Processing

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The computational fluid dynamics (CFD) technology is analyzed and calculated utilizing the turbulence model and multiphase flow model to explore the performance of internal circulating fluidized beds (ICFB) based on CFD. The three-dimensional simulation method can study the hydrodynamic properties of the ICFB, and the performance of the fluidized bed is optimized. The fluidization performance of the ICFB is improved through the experimental study of the cross-shaped baffle. Then, through the cross-shaped baffle and funnel-shaped baffle placement, the fluidized bed reaches a coupled optimization. The results show that CFD simulation technology can effectively improve the mass transfer efficiency and performance of sewage treatment. The base gap crossshaped baffle can improve the hydraulic conditions of the fluidized bed and reduce the system energy consumption. The cross-shaped baffle and funnel-shaped baffle can perfect the performance of the reactor and effectively strengthen the treatment in the intense aerobic process of industrial sewage.

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

Abstract: Circulating fluidized bed downer reactors (downer reactors) exhibit good heat and mass transfer, and the flow behavior approaches the ideal plug flow.

Cited by 12 publications

References 50 publications

Scaling of catalytic cracking fluidized bed downer reactor based on CFD simulations—Part II: effect of reactor scale

Scaling of catalytic cracking fluidized bed downer reactor based on CFD simulations—Part II: effect of reactor scale

Study of Hydrodynamics and Upscaling of Immiscible Fluid Stirred Tank using Computational Fluid Dynamics Simulation

Optimization of the Internal Circulating Fluidized Bed Using Computational Fluid Dynamics Technology

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