Simulation of a kinetic model integrated with variable catalyst holdup applied in industrial fluid catalytic cracking risers
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K. Harish Kiri Sivakumar
Abstract
The importance of the axial catalyst holdup on the accurate prediction of reaction yields from Fluidized Catalytic Cracking Unit (FCCU) risers was explored in this study. The Kunii and Levenspiel model was incorporated in the FCCU riser simulations for predicting the solid holdup. Two approaches were compared – the popular one assuming Constant Holdup (CH) and the other incorporating Variable Holdup (VH) in the reaction kinetics models. Simulation predictions using these two approaches were fitted to the yield profiles obtained from industrial plant data reported in the literature. The kinetic parameter estimates, including frequency factors and coking parameters obtained from these two approaches, were quite similar, indicating insensitivity to catalyst holdup. However, the kinetic model incorporating VH expression could predict the plant conversion and yield to within ±10% error throughout the riser. In contrast, the CH model led to predictions that were rather erroneous (>±25%) at the riser bottom as the catalyst particle acceleration zone was neglected. Temperature, gas density, catalyst particle, and gas phase velocity profiles obtained from the VH approach were considerably different from those obtained using the CH approach. The VH approach showed that the slip factor, especially, was quite distinct as it reached a peak value before decaying exponentially. On the other hand, the CH model showed a monotonic increase in slip factor along the riser.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/ijcre-2021-0100).
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Artikel in diesem Heft
- Frontmatter
- Editorial
- Preface: Special issue dedicated to the International Conference on Reaction Engineering National Institute of Technology, Raipur, India
- Special Issue Article
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Artikel in diesem Heft
- Frontmatter
- Editorial
- Preface: Special issue dedicated to the International Conference on Reaction Engineering National Institute of Technology, Raipur, India
- Special Issue Article
- Semiconducting nanomaterials for photocatalytic desulfurization of liquid fuel under sunlight irradiation
- Optimization and experimental design by response surface method for reactive extraction of glutaric acid
- Equilibrium & kinetic studies of reactive extraction of trans-aconitic acid using sunflower oil with tri-n-octylamine
- Simulation of a kinetic model integrated with variable catalyst holdup applied in industrial fluid catalytic cracking risers
- Alkaline electro-hydrolysis pretreatment of rice straw for enhanced biogas production under ambient temperature
- Acclimatization studies for degradation of Acid Red 3BN dye and its treatment in moving bed biofilm reactor
- Value addition study on coker kero for producing alpha olefin and alkyl benzene
- Cyclic voltammetry to study kinetics of blast furnace slag and cerium dioxide modified electrode
