Gas-solids two-phase flow in a quick-contact cyclone reactor was simulated using a two-fluid model combining with kinetic theory of granular flow to study the effects of drag model and restitution coefficient on flow behavior. Three drag models

i.e. Gidaspow

Wen & Yu and Syamlal-O'Brien model were examined through comparing there effects on particle velocity vector

and radial distribution of particles. Compared with experimental data

it was found that the simulated results using Gidaspow model agreed well with the experimental data while Syamlal-O'Brien and Wen & Yu models showed relatively large errors. In addition

the simulated solids holdup was less than the experimental data when restitution coefficient was relatively small. When restitution coefficient was about 0.95

particles were distributed most uniformly and the simulated results fitted the best with experimental data.