ZHOU Shuaishuai¹， QIAO Congzhen¹， YANG Hao¹， TIAN Yajie¹, PU Yanfeng¹, LIU Mengxi²， LU Chunxi²

(1. College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475000，China;2. State Key Laboratory of Heavy Oil, China University of Petroleum, Beijing 102249, China)

Abstract: In order to solve the feeding device coking problem in pyridine synthesis reactor, a novel riser-bed coupled fluidized bed reactor was proposed. For further commercialization of this coupled reactor, investigation regarding the key feeding injection section were required. Large scale cold-mode experiments were carried out to obtain the flow behavior in the key injection zones of the novel coupled fluidized bed reactor. Experiments results show that the nozzle jet makes the flow structure more complex in the feed injection zones. In the region between the prelift ring and the feed nozzles, the catalysts concentration is high and has an uniform distribution along radial direction, which has similar flow behavior as bubbling fluidized bed. In the nozzle jet influence region, the catalysts concentration is low and the reactants concentration is high where the coking process taken place. In the region above the nozzle jet, the flow structure is typical core-annulus shape, similar to that of a fast fluidization bed. In this region, the back mixing is low and high reaction selectivity is guaranteed.

Keywords: pyridine base; coupled fluidized bed reactor; feeding injection zones; flow behavior

中图分类号：TQ45

文献标志码：A

文章编号：1008-5548(2021)03-0035-08

DOI:10.13732/j.issn.1008-5548.2021.03.005

收稿日期： 2020-10-16，修回日期：2020-12-09，在线出版时间：2021-04-08 10:40。

基金项目：国家自然科学基金项目，编号：91834303，22008055； 河南大学双一流学科建设基金项目， 编号：2019YLZDCG01；河南省自然科学基金项目，编号：202300410063。

第一作者简介：周帅帅(1989—)，男，博士，讲师，研究方向为多相反应器结构优化。E-mail：10150173@vip.henu.edu.cn。

通信作者简介：卢春喜(1963—)，男，博士，教授，博士生导师，研究方向为过程强化。E-mail：lcx725@sina.com。