The influence of the fluidization velocities on products yield and catalyst residence time in industrial risers

H. C. Alvarez-Castro, E. M. Matos, M. Mori, W. Martignoni, R. Ocone

Research output: Contribution to journalArticle

Abstract

The hydrodynamic characteristic of the industrial riser used in the fluid catalytic cracking (FCC) process has been simulated. A gas-solid flow model was developed which describes a 3D industrial set-up. By combining the hydrodynamics with a reaction model the yields of the different product families were obtained with good precision. To represent the kinetic behavior, a twelve-lump model with catalyst deactivation was adopted to represent the kinetic behavior. A tracer technique for catalyst residence time, corresponding to different fluidization velocities, was also considered. The Eulerian-Eulerian approach was adopted and solved by ANSYS CFX 14.0. The results show predictions for fluidization velocities and residence time which should be adopted to get better product yields in the industrial process. The results are compared with data taken in an industrial plant. The model furnishes valuable information on the impact of the riser hydrodynamics on the product quality.

Original languageEnglish
Pages (from-to)836-847
Number of pages12
JournalAdvanced Powder Technology
Volume26
Issue number3
Early online date2 Mar 2015
DOIs
Publication statusPublished - 2015

Keywords

  • Catalytic cracking reaction
  • CFD simulation
  • FCC
  • Gas particle flow
  • Petroleum refining
  • Riser

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