CFD-DEM simulation of gas-solid reacting flows in catalytic reactor
Journal Title: Science Paper Online - Year 2008, Vol 3, Issue 12
Abstract
An extended CFD-DEM coupled approach is used to simulate the complex gas-solid reacting flows in fluid catalytic cracking (FCC) processes accommodated in riser reactor in a transient manner. Considering the solid catalyzed gas-phase reactions, the model particularly incorporate the descriptions for heat transfer behaviors between particles and between gas and particles, the instantaneous catalyst deactivation, and the lumped kinetics in the gas phase for FCC process, together with the transport equations for the gas phase. The presented model is applied to investigate the FCC processes in a riser and another downflow reactor, both of which are two-dimensional, 2 m in height and 0.05 m in width. The distinct advantage of the present approach is that the catalyst activity can be calculated in time by tracking the history of the particle movement with the occurrence of heat transfer and chemical reactions. The simulation results capture the major features of FCC processes very well. The reduced selectivity to the desired intermediate products in the risers, especially under the operations of high catalyst-to-oil ratio, can be clearly understood from the simulated clustering phenomenon and backmixing behavior of catalyst particles. It can be concluded that this type of modeling approach forms a solid basis for the cross-scale modeling of general gas-solid two-phase catalytic reacting flows.
Authors and Affiliations
Changning WU, Yulong DING, Yong JIN , Yi CHENG
Keywords
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