摘要
针对原位聚合原液着色聚酯连续聚合生产过程中制备的低聚体中存在着色剂因“软团聚”造成的分散不均匀问题,利用计算流体力学(CFD)方法,对低聚体制备釜的流场和搅拌器的性能进行分析,通过CFD模拟对比各类搅拌器的排出流量和剪切应力,优化制备釜搅拌器结构。结果表明:相同桨叶数目和搅拌转速下,直叶桨搅拌器的剪切应力高于斜叶桨搅拌器的剪切应力,斜叶桨搅拌器的排出流量高于直叶桨搅拌器的排出流量;提高搅拌转速,直叶桨和斜叶桨搅拌器的排出流量和剪切应力均有提高,且四斜叶搅拌器的排出流量高于同类型六斜叶搅拌器的排出流量;基于CFD数值模拟结果,选择四斜叶开启涡轮式搅拌器作为优化后的搅拌器,原位聚合原液着色聚酯连续聚合生产过程中所制备低聚体中着色剂分散均匀、无明显团聚体存在。
The oligomers prepared in the process of in-situ continuous polymerization of dope-dyed polyester are often accompanied by uneven dispersion due to soft agglomeration from coloring agent slurry.As to these uneven dispersion problems,computational fluid dynamics(CFD)method was employed to analyze the flow field of the oligomer reactor and agitator performance.From CFD simulation results,the shear stress and effluxing flow rate of different types of agitators were compared,and then the agitator structure was optimized.The results showed that the shear stress of straight blade was higher than that of pitched blade while the effluxing flow rate of pitched blade was higher than that of straight blade under the same number of blades and stirring speed;the shear stress and effluxing flow rate of straight blade and pitched blade were both improved with the increase of stirring rate,and the effluxing flow rate of four-pitched blade agitator was higher than that of six-pitched blade agitator of the same type;and the pigment had a homogeneous dispersion with no obviouse aggregation in the oligomer prepared during the continuous polymerization of in-situ polymerized dope-dyed polyester when the four-pitched blade open vortex impeller agitator was selected as the optimized agitator based on the CFD numerical simulation results.
作者
李志勇
邱志成
贾振宇
武术方
马鑫
李睿
刘云崇
金剑
LI Zhiyong;QIU Zhicheng;JIA Zhenyu;WU Shufang;MA Xin;LI Rui;LIU Yunchong;JIN Jian(State Key Laboratory of Biobased Fiber Manufacturing Technology,China Textile Academy Co.,Ltd.,Beijing 100025;College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029)
出处
《合成纤维工业》
CAS
2023年第1期75-78,共4页
China Synthetic Fiber Industry
基金
国家重点研发计划项目(2020YFB0311400)。
关键词
原液着色
聚酯
低聚体
搅拌器
流场
模拟
剪切应力
排出流量
dope dying
polyester
oligomer
agitator
flow field
simulation
shear stress
effluxing flow rate
