Loading...

CFD simulation of gas–solid flow patterns in a downscaled combustor-style FCC regenerator

Azarnivand, A ; Sharif University of Technology | 2018

1220 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.partic.2017.10.009
  3. Publisher: Elsevier B.V , 2018
  4. Abstract:
  5. To investigate the gas–solid flow pattern of a combustor-style fluid catalytic cracking regenerator, a laboratory-scale regenerator was designed. In scaling down from an actual regenerator, large-diameter hydrodynamic effects were taken into consideration. These considerations are the novelties of the present study. Applying the Eulerian–Eulerian approach, a three-dimensional computational fluid dynamics (CFD) model of the regenerator was developed. Using this model, various aspects of the hydrodynamic behavior that are potentially effective in catalyst regeneration were investigated. The CFD simulation results show that at various sections the gas–solid flow patterns exhibit different behavior because of the asymmetric location of the catalyst inlets and the lift outlets. The ratio of the recirculated catalyst to spent catalyst determines the quality of the spent and recirculated catalyst mixing and distribution because the location and quality of vortices change in the lower part of the combustor. The simulation results show that recirculated catalyst considerably reduces the air bypass that disperses the catalyst particles widely over the cross section. Decreasing the velocity of superficial air produces a complex flow pattern whereas the variation in catalyst mass flux does not alter the flow pattern significantly as the flow is dilute. © 2018 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences
  6. Keywords:
  7. Combustor-style regenerator ; Fluid catalytic cracking ; Gas–solid flow pattern ; Large-diameter fluidized bed ; Recirculated catalyst ; Air ; Catalyst regeneration ; Catalysts ; Catalytic cracking ; Combustors ; Computational fluid dynamics ; Cracks ; Flow of solids ; Flow patterns ; Fluid dynamics ; Fluidized beds ; Hydrodynamics ; Regenerators ; Catalyst particles ; Eulerian-Eulerian approach ; FCC regenerators ; Gas-solid flows ; Hydrodynamic behavior ; Hydrodynamic effect ; Large diameter ; Three dimensional computational fluid dynamics
  8. Source: Particuology ; Volume 39 , 2018 , Pages 96-108 ; 16742001 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S1674200118300269