逆流变径耦合催化裂化提升管进料段内固含率及颗粒速度的径向分布  

Radial Distribution of Solid Holdup and Particle Velocity in Countercurrent-Variable Diameter Feedstock Injection Zone of an FCC Riser

作　　者：边京 赵凤静 范怡平[1] 卢春喜[1] BIAN Jing;ZHAO Fengjing;FAN Yiping;LU Chunxi(State Key Laboratory of Heavy Oil,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《石油学报（石油加工）》2018年第6期1117-1126,共10页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点基础研究发展计划项目(2012CB215000)资助

摘　　要：优化现有的油、剂逆流接触催化裂化提升管进料段结构,将进料喷嘴倾斜向下与内径变化相耦合。通过大型冷模实验装置,考察了在逆流变径耦合催化裂化提升管进料段不同轴向高度,固含率和颗粒速度的径向分布及操作条件对其产生的影响,并分别与前人所用的同径结构内的分布结果进行比较。结果表明,与对应的油、剂逆流接触催化裂化提升管进料段同径结构相比,变径结构进料段内,射流控制区域范围约缩短45.2%,且变径结构进料段内局部固含率分布更加均匀,有利于油、剂两相均匀混合。在实验操作范围内,提高预提升气速和适当提高进料喷嘴气速可使催化剂颗粒在径向分布更加均匀。On the basic of previous feedstock injection zone of an FCC(fluid catalytic cracking)riser,where the feed jets contacted counter-currently with particle flow from riser bottom,some improvement was made by changing the size of diameter,thus the countercurrent-variable diameter structure was brought up.The radial distribution of solid holdup and particle velocity in different axial height was studied in a large-scale cold model experimental apparatus,along with the influence of experimental operating conditions on them,and the comparison of experimental results with previous no diameter-changing structure was made accordingly.The results showed that the range of jet control area in the countercurrent-variable diameter feedstock injection zone was shortened by 45.2%,compared with the previous one.Besides,the distribution of local solid holdup was more uniform in the new structure,which was better in realizing a more uniform mixing of feed jet and particle.Furthermore,the distribution and mixing would become more perfect by properly increasing the pre-lift gas velocity and feed jet nozzle gas velocity among the experimental operation range.

关 键 词：催化裂化提升管 进料段 逆流变径 固含率 颗粒速度 

分 类 号：TQ016[化学工程]