CFD Study of Industrial FCC Risers: The Effect of Outlet Configurations on Hydrodynamics and Reactions

Lopes, Gabriela Cantarelli; Rosa, Leonardo Machado da; Mori, Milton; Nunhez, José Roberto; Martignoni, W.P.

doi:10.1155/2012/193639

Cited by 21 publications

(24 citation statements)

References 41 publications

(69 reference statements)

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“…The reaction rates from gasoline to gas and coke of particles in the cluster were higher than that of the isolated particles. Gabriela C. Lopes et al (2012) [31],presented a three dimensional ,three phase flow model and a four lump kinetic base model to study the influence of different riser outlet bend designs on the dynamics of the flow and reactor efficiency .Results show that small changes in the outlet configuration had a significant on the flow patterns and on reactions yields. The use of abrupt exits results in solids ,back mixing which enhanced the residence time of the catalyst and increased its concentration near the top of the riser.…”

Section: Modeling Of Riser Reactor 31 Riser Kineticsmentioning

confidence: 99%

Modeling and Simulation of Fluidized Catalytic Cracking Riser Reactor Using Pseudo Reaction Kinetics : A Review

P.K¹,

Rishabh²

2017

IJET

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The fluid catalytic cracking(FCC) is one of the key process unit in modern oil refining . FCC process converts heavy distillates like gas oil or residue to gasoline and middle distillates using cracking catalyst.FCC consist of two interconnected gas -solid fluidized bed reactor: riser and regenerator .FCC process is very complex and require good understanding of many factors such as kinetic models, reaction kinetic, fluid dynamics, feed and catalyst effects, temperature, residence time in the riser, catalyst deactivation and its regeneration. The performance of the reactor are measured in term of yield of gasoline and light gases, feed conversion, coke yield etc. A number of operating variables can be optimized for economical operation of FCC unit.

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Section: Modeling Of Riser Reactor 31 Riser Kineticsmentioning

confidence: 99%

Modeling and Simulation of Fluidized Catalytic Cracking Riser Reactor Using Pseudo Reaction Kinetics : A Review

P.K¹,

Rishabh²

2017

IJET

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“…Lopes et al (2011) showed in their work the importance of using three-dimensional models to predict the phenomena that occur in the riser. Then Lopes et al (2012) and Barbosa et al (2012) used threedimensional models to study the influence of different riser outlet and inlet geometries, respectively. It was observed that small changes in the riser geometry influence the hydrodynamics and the product profile.…”

Section: Introductionmentioning

confidence: 99%

Study of Feedstock Injection to Improve Catalyst Homogenization in the Riser of a FCC

Pelissari

Alvarez-Castro

Mori

et al. 2016

Braz. J. Chem. Eng.

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Abstract-A three dimensional gas-solid reactive flow model based on the Eulerian-Eulerian approach was used to study the effects of different nozzle designs with internal parts inside the FCC riser. The simulations were solved using Computational Fluid Dynamics (CFD) with CFX version 14.0 as tool. The results showed that the nozzle designs have a significant influence on the gas-solid behavior, resulting in an important role in the hydrodynamics and thermal behavior of the riser. Furthermore, the simulations show it is possible to improve the catalyst-gas distribution with an appropriate nozzle design.

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“…La simulación numérica de este proceso, tratando de predecir el comportamiento del flujo gas-sólidos, evaluando los perfiles de concentración y velocidad de los sólidos así como el perfil de temperatura, se han venido realizando desde las últimas dos décadas del siglo pasado, fundamentalmente variando la geometría y se ha observado que al variarla se modifican los perfiles de flujo a lo largo de todo el riser (Huilin et al, 2006;Hamzehei y Rahimzadeh, 2010;Chalermsinsuwan et al, 2010;Vegendla, et al, 2011, Lopes et al, 2012; pero a la fecha no se ha realizado un estudio donde se propongan dos salidas colocadas asimétricamente como el estudio mostrado en este trabajo.…”

Section: Introductionunclassified

Comportamiento Hidrodinámico y Térmico del Flujo Gas-Sólido en un Reactor de Tubo Vertical (Riser) del Proceso de Craqueo Catalítico (FCC) con dos Salidas Laterales Asimétricas

Paz-Paredes¹,

Saldaña²,

Moreno-Pacheco³

et al. 2016

Inf. tecnol.

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ResumenEn este trabajo se realiza la simulación numérica en 2D del comportamiento hidrodinámico y térmico del flujo gas-sólido en un reactor industrial (riser) con dos salidas colocadas asimétricamente, utilizando un modelo de la Dinámica de Fluidos Computacional. El sistema se considera adiabático y el modelo del sistema se resuelve por una aproximación Euleriana transitoria y la Teoría Cinética del Flujo Granular (KTGF, Kinetic Theory for Granular Flow). Como modelo de arrastre se utiliza la minimización multiescala de la energía (EMMS, Energy Minimization Multi-Scale). Las variables que se analizan son la distribución de densidad, la distribución de velocidades, la distribución del flujo másico, y los perfiles de temperatura de la fase sólida, a varias alturas del riser. Los resultados de este trabajo se comparan con los obtenidos anteriormente para una configuración de salidas simétricas. El modelo predice adecuadamente la presencia de tres zonas de concentración y velocidad de sólidos, así como la formación del patrón de flujo anular esperado en el riser. Palabras clave: simulación numérica; riser industrial; salidas asimétricas; aproximación Euleriana; modelo de arrastre EMMS Hydrodynamic and Thermal Behavior of Gas-Solid Flow in an Vertical Pipe Reactor (Riser) of the Fluid Catalytic Cracking Process (FCC) with Two Lateral Asymmetric Outlets AbstractIn this work 2D numerical simulations of gas-solid flow hydrodynamic and thermal behavior in an industrial riser is made using a Computational Fluid Dynamics model. The mixture goes out from the riser through two lateral upper asymmetric outlets. The system is considered to be adiabatic and the system is solved through a transient Eulerian approach and the Kinetic Theory for Granular Flow. The Energy Minimization MultiScale method (EMMS) is used as a drag model. Solid density distribution, velocity distribution, mass flow distribution and temperature profiles measured at several riser heights are analyzed. The results obtained in this work are compared with those previously obtained in a similar system but having two symmetric outlets. The model properly predicts the presence of three solid concentration and velocity zones, as well as the expected core-annular flow pattern in the riser.

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CFD Study of Industrial FCC Risers: The Effect of Outlet Configurations on Hydrodynamics and Reactions

Cited by 21 publications

References 41 publications

Modeling and Simulation of Fluidized Catalytic Cracking Riser Reactor Using Pseudo Reaction Kinetics : A Review

Modeling and Simulation of Fluidized Catalytic Cracking Riser Reactor Using Pseudo Reaction Kinetics : A Review

Study of Feedstock Injection to Improve Catalyst Homogenization in the Riser of a FCC

Comportamiento Hidrodinámico y Térmico del Flujo Gas-Sólido en un Reactor de Tubo Vertical (Riser) del Proceso de Craqueo Catalítico (FCC) con dos Salidas Laterales Asimétricas

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