脉冲振幅对脉冲折流板萃取柱内气-液-液三相流动规律影响的模拟研究  

Numerical study on influence of pulse amplitude on patterns of gas-liquid-liquid three-phase flow in pulsed extraction column with discs and doughnuts

作　　者：于婷[1] 喻修成 卢宗慧 肖哲 曲鸣 何辉[1] 叶国安[1] Ting YU;Xiucheng YU;Zonghui LU;Zhe XIAO;Ming QU;Hui HE;Guoan YE(China Institute of Atomic Energy,Beijing 102413,China;China Nuclear Power Operation Technology Co.,Ltd.,Wuhan,Hubei 430070,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]中核武汉核电运行技术股份有限公司,湖北武汉430070

出　　处：《过程工程学报》2025年第3期283-292,共10页The Chinese Journal of Process Engineering

基　　金：中核集团青年英才项目(编号:FY222506000503)。

摘　　要：基于CFD模拟技术建立了脉冲折流板萃取柱的气-液-液三相流模型,探究了脉冲振幅对折流板萃取柱内宏观流场演化的影响规律。结果表明,脉冲振幅为1.2 cm的工况下,振幅对水相、有机相两相的运动影响较小,水相在挡板上积聚,脉冲振幅为7.2和14.4 cm的工况下,振幅对水相、有机相两相的运动方向和速度大小均有显著影响,水相脱离挡板分散成更小的液滴;随脉冲振幅增大,湍动能与湍动能耗散率随之增大,在流体冲击固体壁面的区域出现最大值,随脉冲振幅增大,小直径的水相液滴占比更高,强化了萃取过程。本研究使用Euler-Euler两相流模型耦合群体平衡模型模拟脉冲折流板萃取柱内的气-液-液三相演化现象,可为后续脉冲折流板萃取柱的设计及工艺优化提供参考。The pulsed extraction columns with discs and doughnuts play a critical role in the field of spent fuel reprocessing.The countercurrent contact between liquid-liquid two-phase fluids in the column is facilitated through periodic pulses,which significantly influences the separation and purification processes of chemical elements.Although a considerable amount of research on pulse extraction columns with discs and doughnuts has been conducted through simulation,few studies have utilized the actual industrial structure of these columns as examples.A gas-liquid-liquid three-phase flow model coupled with PBM(Polulation Balance Model)to evaluate discrete phase droplet diameter distribution,reflecting the actual structure of pulsed extraction column with discs and doughnuts,was established using CFD(Computational Fluid Dynamics)simulation technology.And it verified the accuracy of the modeling through multiple calculation cases,aiming to investigate the influence of pulse amplitude on the evolution of flow field inside a pulsed extraction column.The model's accuracy was demonstrated through comparison with public literature,and the impact of pulse amplitude on the micro-flow behavior inside the pulsed extraction column was calculated,analyzed and verified.Under the working condition with a pulse amplitude of 1.2 cm,the amplitude had a relatively small impact on the motion of water and oil phases,and the water phase accumulated on the baffle.Under the working conditions of pulse amplitudes of 7.2 and 14.4 cm,the amplitude had a significant impact on the direction and velocity of the water and oil phases,with the water phase separating from the baffle and dispersing into smaller droplets.Furthermore,it was found that as the pulse amplitude increased,both the turbulence kinetic energy and turbulence energy dissipation rate also increased,reaching a maximum value in the region where the fluid impacted the solid wall.Finally,from the distribution of droplet diameter fraction,it was evident that as the pulse amplitude increase

关 键 词：脉冲折流板萃取柱 气-液-液三相流 Euler-Euler模型 群体平衡模型 脉冲振幅 

分 类 号：TL334[核科学技术—核技术及应用]