化工学报2016，Vol.67Issue(8)：3133-3145,13.DOI:10.11949/j.issn.0438-1157.20160378
催化裂化后反应系统快分的研究进展
Advances in quick separators of post-riser system in FRCC unit
摘要
Abstract
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 18μm 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 44μm talc, which was slightly lower than separation efficiency of cyclone.关键词
流态化/多相流/分离/催化裂化/后反应系统Key words
fluidization/multiphase flow/separation/RFCC/post-riser system分类
化学化工引用本文复制引用
刘梦溪,卢春喜,时铭显..催化裂化后反应系统快分的研究进展[J].化工学报,2016,67(8):3133-3145,13.基金项目
国家重点基础研究发展计划项目（2012CB215000）。 （）
