聚丙烯环管反应器中带连接对非均匀流动的影响  

Effects of Belt Connection on the Uneven Flow Structures in the Loop Polypropylene Reactor

作　　者：王可钦 唐铭[2] 黄正梁[2] 杨遥[2] 阳永荣[2] Wang Keqin;Tang Ming;Huang Zhengliang;Yang Yao;Yang Yongrong(School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China;Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China)

机构地区：[1]浙江大学机械工程学院,浙江杭州310027 [2]浙江省化工高效制造技术重点实验室,浙江大学化学工程与生物工程学院,浙江杭州310027

出　　处：《化学反应工程与工艺》2018年第5期409-417,共9页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金（61621002）

摘　　要：为了考察聚丙烯环管反应器中的非均匀流动结构对该装置平稳运行的影响,对含有带连接的聚丙烯环管反应器的流动特性进行计算流体力学(CFD)模拟,并与不含带连接的环管反应器进行对比。模拟发现:带连接对进口管的影响大于出口管,带连接使得进口管的非均匀度急剧增大,但仅使得出口管带连接附近区域的非均匀度出现波动。进一步分析发现,带连接对环管内液固两相的作用机制为进口管处的分流作用和出口管处的集流作用。这一作用使得进口管带连接附近的液固两相从均匀分布变为边壁稀、中心浓的分布,而出口管带连接附近的液固两相分布从边壁浓、中心稀的结构转变为边壁稀、中心浓的结构。研究结果可为聚丙烯环管反应器的优化设计提供指导。In order to investigate effects of uneven flow structure on the stable operation in the loop reactor for polypropylene, the loop reactor with belt connection was simulated by computational fluid dynamics (CFD) in this work and further compared with the one without belt connection to reveal effects of belt connection on the uneven flow structures. Results showed that the effect of belt connection on the flow structure in the inlet pipe of the reactor was bigger than that in the outlet pipe. The non-uniformity in the inlet pipe increased significantly by the belt connection, while in the outlet the non-uniformity just some fluctuations showed in limited regions near the belt connection. Further, the mechanism of belt connection was revealed to be the split-flow effect in the inlet and flow-collection effect in the outlet. Under these two effects, the uniform gas-solid flow in the inlet pipe was changed into the uneven two-phase flow with high solid concentration in the center and low solid concentration near the wall, and the original uneven gas-solid flow with high solid concentration in the center and low solid concentration near the wall was changed to another uneven gas-solid flow with opposite solid distribution in the outlet pipe. Results in this work will show guidance for the design and optimization of the polypropylene loop reactor.

关 键 词：环管反应器 聚丙烯 带连接 非均匀流动 计算流体力学 

分 类 号：TQ027.1[化学工程]