气体类型对FCC汽提器性能影响的实验研究  

Experimental study on effect of gas type on performance of FCC stripper

作　　者：张永民[1,2] 刘朋博[2] 王蒙 陈政[2] 朱丙田 朱振兴[1] ZHANG Yongmin;LIU Pengbo;WANG Meng;CHEN Zheng;ZHU Bingtian;ZHU Zhenxing(Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China;State Key Laboratory of Heavy Oil Processing in China University of Petroleum(Beijing), Beijing 102249, China)

机构地区：[1]中国石化石油化工科学研究院,北京100083 [2]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《中国石油大学学报（自然科学版）》2022年第1期140-146,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(21808245,21276273)。

摘　　要：在催化裂化装置中,汽提器的作用是使用水蒸汽置换出吸附在颗粒内孔以及夹带在颗粒之间的不同种类的烃类分子。传统汽提器研究中大多都使用较轻的氢气或氦气作为示踪气体,利用测得的模拟汽提效率作为评价不同汽提器性能的指标。为了考察汽提器处理不同吸附特性气体时的表现,在一套大型冷模实验装置中,采用吸附能力依次增强的3种示踪气体——He、CO_(2)、R22,分别考察两种不同类型汽提器的模拟汽提效率。结果表明气体吸附特性对汽提器性能具有显著影响,随着示踪气体在分子筛催化剂上吸附能力的增强,测得的汽提效率显著下降,提高表观气速和采用高效内构件对提高汽提效率的效果明显减弱;对于吸附能力强的示踪气体,采用高效填料内构件提高汽提效率的相对效果更好。In fluid catalytic cracking(FCC)units,the role of stripper is to replace the different types of hydrocarbons adsorbed in the pores of catalyst particles and entrained in the interparticle porosities using steam.In previous studies on FCC strippers,small-molecular gases,e.g.hydrogen or helium,are mostly used as tracer gases to obtain the measured simulation stripping efficiency as a parameter to evaluate the performance of different strippers.In order to investigate the different performances of strippers to strip different types of gases,a large-scale cold model was setup where three gases with increasing adsorption capacities in zeolite catalysts,i.e.He,CO_(2) and R22,were used as tracer gases to measure the stripping efficiencies.Two strippers,i.e.a packed stripper and a baffle-free stripper were both tested.The experimental results indicate that adsorption capacity of tracer gas has a profound effect on the performance of strippers.When the adsorption capacity of a tracer gas increases,the measured stripping efficiency decreases and the improvement on stripping performance using increased superficial gas velocity and adding high-efficiency internals decreases.For the tracer gas with high adsorption capacity in zeolite catalyst,the relative increment of stripping efficiency by the employed high-efficiency packing internals also increases considerably.Based on these findings,a two-stage stripper idea is suggested where different operating conditions are obtained in the two stages for stripping different types of hydrocarbon gases.

关 键 词：吸附 汽提器 汽提效率 流化床 实验 

分 类 号：TF803.11[冶金工程—有色金属冶金]