VALIDATING THE PREDICTION CAPACILITIES OF COMMERCIAL ANSYS CFD SOFTWARE IN THE STUDY OF HYDROCARBON-CATAYST HYDRODYNAMICS OF FLUID CATALYTIC CRACKING (FCC) RISER REACTORS

摘要

The application of the ANSYS commercial computational fluid dynamics (CFD) usefulness tostudy the hydrodynamics of hydrocarbon-catalyst flow in FCC is a very useful and complexphenomenon. In order to establish reliable, precise and reasonable predictions, a choice of runs fortime-average comparison for solid (catalyst) velocities and concentrations to measure fluxes anddensities along the riser axes of flow regime. The model structure were carried-out successfullyand compared with experimental data on a FCC riser length of 15.1m and 0.10 m in diameter,which incorporates a two-fluid framework with kinetic theory of granular flows to simulate fullydeveloped hydrocarbon catalyst flows in the vertical risers. The preliminary studies were based onthe simulation of gas-solid hydrodynamics and flow behaviour in a riser circulating fluidised bed(CFB) reactor using the Eulerian-Eulerian two-fluid modelling approach, incorporating a kinetictheory constitutive model for dilute assemblies of FCC particulate solid. The interaction betweengas and particles was modelled using particle interphase momentum transfer model with Gidaspowand Schiller Naumann drag model, using turbulent k-ε models. The CFD predictions werereasonably compared with established experimental data from the literature. The overall flowpatterns within the FCC riser reactors were predicted well by the model. The results of this studyassist in a better understanding of the hydrodynamics of gas-solid flow in CFB/FCC real lifeapplications, which could help in areas of pressure regulations, process flow control, and energyefficiency and utilisation.