文献类型：期刊文献

英文题名：A computational fluid dynamics model coupled with ethylene polymerization kinetics for fluidized bed polyethylene reactor

作者：Cai, Min[1];Tian, Zhou[2,3];Liu, Zhen[1];Liu, Boping[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Meilong Rd 130, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Smart Mfg Energy Chem Proc, Minist Educ, Shanghai 200237, Peoples R China;[3]Tongji Univ, Shanghai Inst Intelligent Sci & Technol, Shanghai 200092, Peoples R China

年份：2022

卷号：407

外文期刊名：POWDER TECHNOLOGY

收录：;EI(收录号：20222712331143);WOS:【SCI-EXPANDED(收录号:WOS:000827274800003)】；

基金：This work is financially supported by the National Natural Science Foundation of China (Basic Science Center Program: 61988101) , National Natural Science Fund for Distinguished Young Scholars (61725301) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Computational fluid dynamic; Polymerization kinetics; Fluidized bed reactor; Modeling

摘要：This work aims at exploring the effect of macro operating conditions on the distribution of temperature field and chain microstructures of polymer in a gas phase ethylene polymerization fluidized bed reactor (FBR) by coupling polymerization kinetics with computational fluid dynamics (CFD). An ethylene polymerization kinetic model in terms of the method of moments was introduced to CFD model. In the modeling framework, the Flory's distribution and custom field functions were used to predict the molecular weight distribution (MWD). The results show that the average molecular weight decreases with the increasing of reaction temperature, and MWD becomes wider because of the increase of temperature gradient. With the increase of hydrogen concentration, the average molecular weight and MWD becomes smaller and narrower, respectively. Unlike the hydrogen concentration, an increase in the ethylene concentration leads to an increase in the average molecular weight, polydispersity distribution index (PDI), and temperature. An increase of gas velocity improves the heat transfer of FBR but results in a very wide MWD when gas velocity exceeds the optimum fluidizing velocity. This model is helpful to understand how the operating conditions affect the performance of FBR and can provide theoretical guidance for the operation and design of polyolefin FBR.