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首页» 过刊浏览» 2020» Vol.5» Issue(1) 122-131     DOI : 10.3969/j.issn.2096-1693.2020.01.012
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催化裂化提升管进料混合区内固含率的动态特征及聚团行为
闫子涵,范怡平,卢春喜,徐春明
中国石油大学( 北京) 化学工程与环境学院重质油国家重点实验室,北京 102249
Solids hold-up dynamic behavior and cluster characteristic in FCC jet mixing zone
YAN Zihan, FAN Yiping, LU Chunxi, XU Chunming
State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum-Beijing, Beijing 102249, China

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摘要  在大型冷模实验装置中,采用PV-6D型光纤颗粒浓度测量仪获得催化裂化提升管进料混合区内固含率的动态数据,结合提升管内颗粒聚团的传统分析方法,获得进料混合段内颗粒聚团时间分率的分布,以此为基础对比分析油剂并流和逆流接触两种条件下的颗粒聚团特征。结果表明,当射流斜向上时(油剂并流接触),主射流影响区和二次流影响区内的瞬时固含率存在较大波动,且聚团时间分率较高,表明射流二次流对该区域的气固流动产生较大影响;反之,当射流斜向下时(油剂逆流接触),各径向位置瞬时固含率的波动均不大,表明油剂间的混合较为均匀,原料射流容易与催化剂颗粒充分接触,同时聚团相的时间分率显著降低,有利于提高油剂间的接触和反应效率。
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关键词 : 催化裂化;提升管;进料混合区;固含率;聚团
Abstract

The dynamic data of particle concentration in the jet mixing zone of FCC risers was obtained by a PV-6D optical
fiber probe in a large scale cold model device. To describe the cluster characteristic, the time fraction of cluster was defined.It is a ratio of cluster existence time with total sampling time. The distributions of cluster time fraction in the jet mixing zone were obtained by using the method of aggregate identification in the fast fluidized bed. Comparison between concurrent and counter-current feed injection structures was made. Results show that the fluctuations of solids hold-up is very large in the main
flow influence region and secondary flow influence region of concurrent feed injection structure. Besides, a high time fraction of cluster phase can be obtained. This is mainly because of the effect of jet secondary flow. On the contrary, in the counter-current feed injection scheme, there is no significant fluctuation of solids hold-up, indicating a uniform mixing of feed jets with catalyst particles. Moreover, the time fraction of cluster decreases obviously, which will promote to the contact and reaction between feed injection and catalyst particles.

Key words: fluid catalytic cracking; riser; jet mixing zone; solids hold-up; cluster
收稿日期: 2020-03-28     
PACS:    
基金资助:博士后科学基金面上项目(2019M650962) 以及中央高校基本科研业务费专项资金(2462018YJRC016) 联合资助
通讯作者: lcx725@sina.com, xcm@cup.edu.cn
引用本文:   
闫子涵, 范怡平, 卢春喜, 徐春明. 催化裂化提升管进料混合区内固含率的动态特征及聚团行为. 石油科学通报, 2020, 01: 122-131
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YAN Zihan, FAN Yiping, LU Chunxi, XU Chunming. Solids hold-up dynamic behavior and cluster characteristic in FCC jet mixing zone. Petroleum Science Bulletin, 2020, 01: 122-131.
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