双层喷嘴进料提升管内气固流动混合特性的大型冷模实验研究  

Experimental and theoretical study on gas-solid flow characteristics in feedstock injection zone of FCC riser with double-layer nozzles

作　　者：许峻 王智峰 侯凯军 高永福 范怡平[1] 卢春喜[1] XU Jun;WANG Zhifeng;HOU Kaijun;GAO Yongfu;FAN Yiping;LU Chunxi(State Key Laboratory of Heavy Oil,China University of Petroleum,Beijing 102249,China;Key Laboratory of Heavy Oil Processing of CNPC,Lanzhou 730060,Gansu,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 [2]中国石油重质油加工重点实验室,甘肃兰州730060

出　　处：《化工学报》2021年第8期4019-4029,共11页CIESC Journal

基　　金：中石油重大专项催化轻馏分油组合进料技术研究。

摘　　要：为改善催化裂化工艺的产品分布,在传统单层向上原料喷嘴进料结构基础上,增加了2个对称、向下的“副喷嘴”。通过一套大型冷模实验装置,考察这种新型双层喷嘴进料段结构内气固流动混合特性,同时利用射流“二次流”理论,分析了逆向喷嘴射流二次流在提升管内的形成发展过程。实验结果表明,与传统单层向上喷嘴(主喷嘴)结构相比,双层喷嘴结构能够改善主喷嘴附近油剂匹配程度,提高气固接触效率。同时副喷嘴的加入可以将提升管进料段长度缩短1/3,减少油剂混合时间,加快气固相达到均匀稳定,实现抑制油气过度裂解,提高目标产品收率,降低生焦量的目的。In order to improve the product distribution of FCC process,on the basis of the traditional single-layer upward feedstock nozzle feed structure,two symmetrical and downward“sub-nozzles”have been added.The gas solid flow characteristics of the double-layer nozzles were experimentally investigated in a large-scale cold model.The occurrence of the secondary flow of the downward nozzle jet in the riser was analyzed by using“secondary flow”theory.The results showed that,the double-layer nozzle structure can improve the matching of oil&catalyst particles and improve the gas-solid contact efficiency compared with the traditional single-layer nozzle structure.Furthermore,the secondary nozzle can shorten the mixing height of riser by 1/3,reduce the mixing time of oil&catalyst particles,accelerate the uniformity and stabilization of gas-solid phase,realize the purpose of restraining over-cracking of oil,improving the target product yield and reducing coke generation.

关 键 词：催化裂化 提升管反应器 进料段 双层喷嘴 多相流 流体动力学 

分 类 号：TQ016[化学工程]