现代纺织技术2025，Vol.33Issue(7)：23-31,9.DOI:10.12477∕j.att.202410034
丙烯腈水相悬浮聚合过程的CFD模拟
CFD simulation of the aqueous suspension polymerization process of acrylonitrile
摘要
Abstract
Among various types of carbon fibers,PAN-based carbon fibers have become the most significant component of high-grade carbon fiber product series due to their excellent mechanical properties.The industrial preparation of PAN fibers typically involves an aqueous suspension polymerization process.In the production of acrylic fibers,the polymerization process prior to spinning is a critical step that determines product quality.Among the factors influencing this process,the mixing effect is vital for enhancing product quality.Uniform mixing ensures the consistent distribution of reactants,thereby maintaining the stability of polymerization rate,and significantly influencing molecular weight distribution and the overall quality of the fibers. To enhance the mixing effect within the reactor,this paper employed computational fluid dynamics(CFD)technology to model and conduct numerical simulations of the aqueous suspension polymerization process of acrylonitrile.Based on experimentally measured kinetic and rheological data,complex transport models and reaction kinetic models,such as the reaction rate equations and reaction heat equations for various substances,were transferred into Fluent software using C language to create user-defined function(UDF).The resulting CFD model integrates coupled flow mixing,mass and heat transfer,and polymerization reaction processes.The numerical simulation method was utilized to investigate the distribution patterns of velocity fields,components change,temperature fields,and polymerization products within the reactor during the polymerization process.By utilizing moment equations,the infinite-dimensional terms in the dead polymer reaction rate equations were converted into finite dimensions,enabling the solution of polymerization product quality indicators such as molecular weight distribution index and molecular weight. The simulation results briefly demonstrate the patterns of temperature distribution and monomer distribution within the polymerization reactor,highlighting the complexity and inhomogeneity of the rheological behavior of the reaction medium inside the reactor.This underscores the importance of reactor structural design.In comparing the simulation results with actual production data,the errors in inlet and outlet temperature rise,monomer conversion rate,molecular weight,and molecular weight distribution index are all within 15%.This,to a certain extent,validates the feasibility and accuracy of the numerical calculation model.This method also provides important theoretical reference for the enhancement of polymerization processes and the design and scaling-up of reactors.关键词
丙烯腈/反应器/反应动力学/CFD模型/聚合过程/质量指标Key words
acrylonitrile/reactor/reaction kinetics/CFD model/polymerization process/quality index分类
机械制造引用本文复制引用
袁东,曹晓磊,陈晔..丙烯腈水相悬浮聚合过程的CFD模拟[J].现代纺织技术,2025,33(7):23-31,9.基金项目
中石化安庆分公司技术开发(委托)项目(2025) （委托）
