合成吡啶碱的新型耦合反应器进料段流动行为  

Flow behavior in feed injection zones of novel coupled fluidized bed reactor for pyridine base synthesis

作　　者：周帅帅 乔聪震[1] 杨浩[1] 田亚杰 蒲彦锋 刘梦溪[2] 卢春喜[2] ZHOU Shuaishuai;QIAO Congzhen;YANG Hao;TIAN Yajie;PU Yanfeng;LIU Mengxi;LU Chunxi(College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475000,China;State Key Laboratory of Heavy Oil,China University of Petroleum,Beijing 102249,China)

机构地区：[1]河南大学化学化工学院,河南开封475000 [2]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《中国粉体技术》2021年第3期35-42,共8页China Powder Science and Technology

基　　金：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。

摘　　要：针对传统吡啶碱生产装置进料分布器结焦问题,提出新型的提升管-床层耦合反应器。为进一步指导该反应器的工业化放大,需对其关键进料区域进行实验研究。通过大型冷态实验测量新型耦合反应器关键进料区域内颗粒相的流动行为。实验结果表明,喷嘴射流的存在使得耦合反应器进料区域的流动行为变得复杂;在进料喷嘴和预提升分布环之间存在密相区域,该区域催化剂浓度较高,原料浓度较低,与典型的鼓泡流化床具有类似的流动特性;在射流引入点附近存在喷嘴射流影响区,对应原料浓度较高,催化剂浓度较低,是结焦发生的主要区域;在射流以上存在快速流动区域,对应流动结构呈现出典型的快速床流动结构,返混较低,能够有效提高吡啶碱的选择性。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.

关 键 词：吡啶碱 耦合反应器 进料区域 流动行为 

分 类 号：TQ45[化学工程—农药化工]