A three - dimension gas - particle two - phase flow - reaction model for RFCC riser reactors was developed by using turbulent flow model and lumping kinetics model and integrating flow

heat transfer and reaction. Numerical simulation of four commercial riser reactors was carried out

and the velocity

temperature and concentration profiles in the axial and radial sections were revealed. The calculated parameter values at the outlet of reactor are consistent with the commercial data

which verified the reliability of the flow - reaction model.