操作条件对熔盐萃取槽内两相流动特性的影响研究  

Influence of operating conditions on two-phase flow characteristics in molten salt extraction tank

作　　者：陈永利 钟振亚 张金宇 张磊[1] 苏醒 叶国安[1] 林如山[1] 唐洪彬[1] CHEN Yong-li;ZHONG Zhen-ya;ZHANG Jin-yu;ZHANG Lei;SU Xing;YE Guo-an;LIN Ru-shan;TANG Hong-bin(Institute of Radiochemistry,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《化学研究与应用》2022年第11期2680-2686,共7页Chemical Research and Application

基　　金：国家自然科学基金项目(U1867203)资助。

摘　　要：本文针对乏燃料干法后处理熔盐萃取槽开展了高温LiCl-KCl熔盐和金属镉的液-液两相搅拌流动数值模拟研究。基于FLUENT中的κ-ωSST模型,采用四叶锚式搅拌桨对比了搅拌桨转速(6种条件)和两相入口速度(各5种条件)对搅拌混合和两相分离的影响,同时考察了其功率消耗。结果表明,在本研究范围内(搅拌转速50rpm~175rpm,两相入口流速0.1m·s^(-1)~1.5 m·s^(-1)),搅拌转速越大萃取槽内两相混合越充分,125rpm~150rpm为推荐转速值;熔盐入口流速越大萃取槽内两相混合和分离越差,在0.25 m·s^(-1)~0.5 m·s^(-1)之间效果较好;金属镉入口流速在0.5 m·s^(-1)时两相混合和分离较理想。本文可为熔盐萃取槽的设计和操作条件的改进提供参考。Numerical simulation of liquid-liquid two-phase stirring flow of high-temperature LiCl-KCl molten salt and metal cadmium is carried out for the molten salt extraction tank for dry reprocessing of spent fuel.Based onκ-ωSST model in FLUENT,the effects of impeller speed(6 conditions)and two-phase inlet velocity(5 conditions each)on mixing and separation of stirred flow were compared by using four-blade anchor impeller,and the power consumption was also investigated.The results showed that within the range of this study(stirring speed 50rpm~175rpm,two-phase inlet flow rate 0.1m·s^(-1)~1.5m·s^(-1)),the higher the stirring speed,the more complete the two-phase mixing in the extraction tank,and 125rpm~150rpm was the recommended speed value.The larger the inlet flow rate of molten salt,the worse the two-phase mixing and separation in the extraction tank,and the best effect is between 0.25 m·s^(-1)~0.5 m·s^(-1).When the inlet flow rate of cadmium is 0.5 m·s^(-1),the mixing and separation of the two phases are the best.The paper could provide reference for the design of molten salt extraction tank and improvement of operating conditions.

关 键 词：乏燃料干法后处理 萃取槽 两相流 数值模拟 

分 类 号：O658.9[理学—分析化学]