Numerical investigation of film forming characteristics and mass transfer enhancement in horizontal polycondensation kettle  

作　　者：Xupeng Chen Jintao Wu Jianfei Sun Kunpeng Yu Jianzhong Yin 

机构地区：[1]State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第11期31-42,共12页中国化学工程学报（英文版）

基　　金：the financial support of the National Key Research and Development Program of China(2020YFA0710202,2018YFC0808805)。

摘　　要：The process of producing high viscosity polyester by transesterification polycondensation needs to adjust the operating conditions and equipment structure of pre-polycondensation kettle and final polycondensation kettle to realize process intensification.In view of this,the fluid volume function method of computational fluid dynamics numerical simulation was used to investigate the film formation and surface renewal characteristics of horizontal polycondensation kettle under different operating conditions,including viscosity,rotating speed and liquid height.The results show that the viscosity and rotating speed were positively correlated with the film area and surface renewal in the pre-polycondensation stage.However,increasing the viscosity by several orders of magnitude in the final polycondensation kettle,the larger the film area and film thickness,but the overall surface renewal of the disk decreased.Therefore,a hexagonal hole disk is designed.By comparison,it is found that the film is more uniform,the surface update frequency is higher,and the power consumption can be reduced by more than 20%.

关 键 词：Pre-polycondensation kettle Final polycondensation kettle Film forming characteristic Surface renewal Numerical simulation 

分 类 号：TB383.2[一般工业技术—材料科学与工程]