Chemical Engineering Science, Vol.111, 170-179, 2014
Computational investigation of the hydrodynamics, heat transfer and kinetic reaction in an FCC gasoline riser
This study presents CFD modeling of the hydrodynamics, heat transfer and kinetic reaction in an industrial FCC gasoline riser. By integrating a lumping kinetic model of gasoline conversion with the two fluid model, a comprehensive flow, heat transfer and reaction model is established. CFD analyses are performed, and the influences of the operating parameters are evaluated. The results indicate that the velocity, volume fraction, temperature and species concentration are considerably non uniform in the axial and radial directions of the riser. Under high severity operating conditions, the olefin species in FCC gasoline is reduced significantly, whereas the propylene species is significantly increased. A high reaction temperature and a long reaction time are beneficial to producing clean low-olefin gasoline and more propylene. A low catalyst-to-oil ratio might be better for the current FCC gasoline riser. (c) 2014 Elsevier Ltd. All rights reserved.