传统SK型与新型静态混合器的结构优化  

Structure optimization of traditional SK type and new static mixers

作　　者：陈西锋 陈晔[1] CHEN Xifeng;CHEN Ye(School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学机械与动力工程学院,南京211816

出　　处：《现代纺织技术》2023年第3期1-11,共11页Advanced Textile Technology

基　　金：中石化安庆分公司技术开发(委托)项目(32000000-21-ZC0607-0006)。

摘　　要：为了提高聚丙烯腈纤维的合成质量,从提高合成聚丙烯腈的三股物料混合均匀度出发,利用CFD技术进行多相流流场的数值计算方法,探讨SK型静态混合器的元件结构参数及元件数量对混合器管内三股物料预混均匀度的影响,并分析相应的压力降变化等。结果表明:当混合元件的宽度D=110 mm、长宽比L D=1、元件扭转角α=270°时混合效率最高。为达到理想混合均匀度的目的,以优化后的混合元件参数为基础设计一种新型静态混合器并对其进行数值模拟,满足要求时的新型混合器的总长度约为传统SK型静态混合器长度的12。新型静态混合器的混合效率比传统SK型静态混合器约提高了50%,但压力降损失也较大。China's demand for polyacrylonitrile fibers is increasing year by year,so the synthetic quality of polyacrylonitrile is also increasingly high.The synthesis process of polyacrylonitrile is made of three different materials through three feed pipes into the polymerization kettle for polymerization reaction.In the production process,"scarring"and poor molecular quality of polyacrylonitrile often occur at the bottom of the feed pipe.The reason for the formation of"scarring"phenomenon is that when the temperature of the monomer near the bottom of the feed pipe rises suddenly in the process of pipeline transportation,more self-polymerization reactions occur on the monomer,and the self-polymerization products will be attached to the bottom of the pipe.Over timem the"scarring"phenomenon appears at the bottom of the feed pipe,which will lead to the blocking of the bottom of the feed pipe in serious cases,resulting in great economic losses.Due to the polymerization of the three strands before entering the polymerization kettle,the synthesis quality of polyacrylonitrile will be poor.In order to improve the synthetic quality of polyacrylonitrile fibers,the feeding system will be redesigned.In order to improve the mixing uniformity of three strands of polyacrylonitrile,a static mixer of SK type was introduced into the feeding system.The numerical calculation method of multiphase flow field was carried out by CFD technology.The influence of relevant structural parameters of the elements of SK type static mixer and the number of elements on the premixed uniformity of three strands of materials in the mixer tube was discussed,and the corresponding pressure drop was analyzed.The related dimensions of the optimal mixing effect of the mixing elements were obtained by orthogonal test.A new static mixer was designed based on the optimized parameters of the mixing elements for the purpose of achieving the ideal mixing uniformity.The new static mixer was mainly composed of two sections with different diameters.It is found that the mix

关 键 词：静态混合器 聚丙烯腈纤维 混合均匀度 CFD技术 多相流 

分 类 号：TH122[机械工程—机械设计及理论] TQ021.1[化学工程]