A post-riser system in RFCC unit has a significant influence on product yield and distribution

as well as long term operation of the unit. Quick separators are the core equipment of the system. The fundamental research

development and commercialization of quick separators of post-riser system in China were reviewed. The influence of key geometric configuration and size on the two-phase flow field

separation efficiency and pressure drop were also analyzed and discussed. In order to reduce the contact time of catalyst and oil gas and to discharge oil gas as soon as quickly

a rough cut cyclone was coupled with a pre-stripper. Internals were mounted in the system

which were also called FSC and CSC system

to diminish the fluctuating processing vortex core and to reduce the influence of pre-stripping steam. Then a post-riser system called VQS was proposed

which included a vortex quick separator and an isolated shell. The study was conducted to optimize the geometric configuration of the separator

and the one with long and downward spiral arms was found to have excellent performance. Furthermore

the simulation results showed that severe short cut flow occurred in the vicinity of the exit of arms

leading to significant drop of separation efficiency. Then

a new system called SVQS was proposed by adding an annular cover and a tube into the system. As a result

the separation efficiency considerably increased about 30% for 18 μm talc

meanwhile the separation pressure drop raised only 400 Pa. In order to reduce the separation time

a quick separator was proposed and optimized. The separation time was reduced to less than 1 s

and separation efficiency was closed to 75% for 44 μm talc

which was slightly lower than separation efficiency of cyclone.