CFD modeling of gas-solid flow and cracking reaction in two-stage riser FCC reactors

摘要

The Eulerian-Eulerian approach was applied to simulate the flow behavior and catalytic cracking reactionsin the riser reactors of two-stage riser fluid catalytic cracking (TSRFCC) technology. A k - ε - k_p - ε_p- Θgas-solid turbulent flow model was used, which took account of the particle turbulence and the interactionof turbulence between gas and particle phases. A 14-lump kinetics model was used for simulating crackingreactions. The approach and model were validated with both experimental results and commercial data.The distributions of particle fraction volume and velocity, as well as product yields in the TSRFCC riserreactors were first analyzed. The simulations were then carried out for optimization studies to understandthe influence of the operating conditions on the performance of commercial TSRFCC riser reactors. Themodel and results presented here are valuable for the design and optimization of TSRFCC technology.