Parametric study of particles homogenization in cold-flow riser reactors

Gómez-Velásquez, Natalia; López-Montoya, Tatiana; Bustamante, C. A.; Nieto-Londoño, César

doi:10.1016/j.ijft.2020.100058

Cited by 4 publications

(2 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, the granular inlet temperature, in the range between 1x10 -3 and 1x10 -1 , does not have a material effect on radial profiles of solid volume fraction and velocity in downer reactor flow. For further details on the sensibility analysis for the KTGF model, see the authors' results included in [35][36].…”

Section: Mesh Independency Studymentioning

confidence: 99%

Computational study of particle distribution development in a cold-flow laboratory scale downer reactor

López-Montoya

Bustamante

Nieto-Londoño

et al. 2021

CT&F Cienc. Tecnol. Futuro

Self Cite

View full text Add to dashboard Cite

The use of downer reactors (gas-solid co-current downward flow) in the Fluid Catalytic cracking (FCC) process for the upgrading of heavy crude oil into more valuable products has gradually become more common in the last decades. This kind of reactor is characterized by having homogeneous axial and radial flow structures, no back mixing, and shorter residence times as compared with the riser reactor type. Although downer reactors were introduced a long time ago, available information in literature about the multiphase hydrodynamic behavior at FCC industrial scale is scarce. Therefore, it is necessary to conduct experimental and computational studies to enhance the understanding of the hydrodynamics of two-phase co-current downward flow. The Computational Fluids Dynamics (CFD) software, Ansys Fluent, is used to study two-dimensional gas (air) and solid (catalyst particle) flow in a downer section of a cold-flow circulation fluidized bed (CFB) system at a laboratory scale. The implemented computational model is validated by comparing numerical results for solid velocity and volume fraction with measurements carried out on a CFB system using a fiber-optic probe laser velocimeter. According to numerical results obtained for different gas velocity and solid flux, flow development cannot only be estimated by considering solid axial velocity changes along the reactor; it is also necessary to take into account solid volume fraction axial variations as radial profiles can change even when velocity profiles are developed.

show abstract

Section: Mesh Independency Studymentioning

confidence: 99%

Computational study of particle distribution development in a cold-flow laboratory scale downer reactor

López-Montoya

Bustamante

Nieto-Londoño

et al. 2021

CT&F Cienc. Tecnol. Futuro

Self Cite

View full text Add to dashboard Cite

show abstract

“…The catalyst is repeatedly circulated in the reactor as connected to the regeneration. In the regenerator controlling the temperature of the regenerator is necessary [9].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Process Parameter in Fluid Catalytic Cracking Unit for a Refining and Petrochemical Company in Nigeria

Olugbenga¹,

Oluwaseyi²

2023

ACES

View full text Add to dashboard Cite

The aim of this study is to generate operational data that can be used to improve the production capacity in the Fluid Catalytic Cracking Unit (FCCU) in a Refinery and Petrochemical Company. This will aid in tackling the daunting challenge of unavailability of operational data that can be used to better understand and improve production capacity and ensure maximizing catalyst utilization. In addition, it addresses the challenges of analysis and control of the FCCU process due to its very complicated and little-known hydrodynamics, complex kinetics of both reactions of cracking and coke burning, strong interaction between the reactor and regenerator, and numerous operating constraints. Aspen HYSYS version 8.0 was used in modeling the cracking process using parameters extracted from the operating manual of the FCCU in the refinery. The operational data was used to compare the simulated effect of stepwise input in feed and reactor plenum temperatures as well as stepwise increase in reactor length on yield, catalyst-to-oil-ratio and catalyst regeneration. An optimum flow in naphtha was obtained by the interaction of the inlet crude flow rate, riser height, and temperature this optimum was supported by the study of the interaction of these parameters when, catalyst to oil ratio was set as the dependent parameter. The inferences drawn from the results are that the reactor plenum temperature of 560˚C and a riser length of 27 m are recommended for optimum performance that ensures lasting effect of an efficient catalyst activity.

show abstract

Computational simulation of SE-SR of methane in a bench-scale circulating fluidised bed reactor: Insights into the effects of bed geometry design and catalyst-sorbent ratios

Udemu,

Font-Palma

2024

Fuel

View full text Add to dashboard Cite

Parametric study of particles homogenization in cold-flow riser reactors

Cited by 4 publications

References 47 publications

Computational study of particle distribution development in a cold-flow laboratory scale downer reactor

Computational study of particle distribution development in a cold-flow laboratory scale downer reactor

Analysis of the Process Parameter in Fluid Catalytic Cracking Unit for a Refining and Petrochemical Company in Nigeria

Computational simulation of SE-SR of methane in a bench-scale circulating fluidised bed reactor: Insights into the effects of bed geometry design and catalyst-sorbent ratios

Contact Info

Product

Resources

About