The characteristics of slip velocity between gas and solid in a short-contact cyclone FCC reactor was simulated using the Eulerian-Eulerian two fluid model

especially about radial distribution of the tangential slip velocity between gas and solid as well as its dependence on operational and physical parameters in the separation chamber. Simulation results showed that the tangential slip velocity between gas and solid had a two-humped distribution in the radial direction. With increase of the inlet gas velocity or decrease of the ratio of catalyst to gas

the tangential slip velocity between gas and solid weakened but the tangential velocity of solid particles enhanced

which would strengthen the centrifugal force on particles and improve the gas-solid separation efficiency. The particle density exhibited little influence on radial distribution of the tangential slip velocity between gas and solid. However

when the particle diameters were increased

the dust outlet would easily be clogged which was not conducive to running the reactor for a long cycle of time. Finally

a model of the average cross-section tangential slip velocity between gas and solid was established with no more than ±7.0% difference among model simulations and calculated results.