CFD仿真在萃取箱设计上的应用  

Application of CFD Simulation on the Design of a Mixer-settler

作　　者：郭天宇 刘诚[1] 姚心[1] Ronnie Andersson GUO Tian-yu;LIU Cheng;YAO Xin;Ronnie Andersson

机构地区：[1]中国恩菲工程技术有限公司,北京100038 [2]瑞典查尔姆斯理工大学,瑞典哥德堡41296

出　　处：《有色冶金节能》2021年第1期43-49,53,共8页Energy Saving of Nonferrous Metallurgy

摘　　要：针对某年产钴金属量10000 t项目中萃取箱设计和使用的问题,采用CFD数值仿真分析萃取箱内的水油分布、速度流场、混合物分散带、停留时间、澄清效果,为萃取箱的优化设计提供理论支撑和验证。仿真结果与PIV水模实验结果一致:澄清室的上层一般为层流,进口附近底部易形成涡流。基于仿真模型对澄清室内部结构进行优化研究,结果表明在澄清室入口端加栅板,可使混合液形成分流,沿入口整个垂直面以较均匀速度进入澄清室,但会导致澄清分离效果变差。此外,还研究了澄清室深度和长宽比对两相分离效果的影响。本设计澄清室深度达到1 m后,继续增加澄清室深度对于促进澄清速率和澄清效果的作用有限;长宽比偏小的澄清室分离效果不佳,容易形成死区。设计澄清室时应综合考虑上述因素的影响。Aiming at the design and application of mixer-settler in a project with an annual output of 10000 tons of cobalt,CFD numerical simulation was used to analyze the water oil distribution,velocity flow field,mixture dispersion zone,residence time and clarification effect in the mixer-settler,so as to provide theoretical support and verification for the optimization design of the mixer-settler.The simulation results were consistent with the PIV experimental results,which showed that the upper layer of the mixer-settler was laminar flow,and the vortex was easy to form at the bottom near the inlet.Based on the simulation model,the internal structure of the mixer-settler was studied.The results showed that adding a grid plate at the inlet of the mixer-settler can make the mixture form a shunt and enter the mixer-settler at a more uniform speed along the whole vertical plane of the inlet,but it would lead to the deterioration of the clarification and separation effect.In addition,the influences of the depth and aspect ratio of the mixer-settler on the two-phase separation were also studied.When the depth of the clarifier reached 1m,the in-fluences of increasing the depth of the mixer-settler on the clarification rate and effect was limited;the separation effect of the mixer-settler with small aspect ratio was not good,and it was easy to form a dead zone.The above factors should be taken into account in the design of mixer-settler.

关 键 词：萃取箱澄清室 流场分析 CFD模拟 澄清效果 设计优化 

分 类 号：TF803.23[冶金工程—有色金属冶金] TF816