摘要
本文针对乏燃料干法后处理高温熔盐离心泵输送LiCl-KCl熔盐过程,开展了不同操作条件和物性参数下的数值模拟研究。基于Fluent数值模拟软件,选用标准k-ε湍流模型,压力和速度耦合采用Coupled算法,对比了熔盐泵水力性能和内部流场的变化情况。结果表明,不同工作条件下熔盐泵外特性曲线走向及内部流场压力、速度分布规律相一致。等流量工况下转速增大熔盐泵扬程、功率增大,最佳效率点向大流量偏移,推荐干法熔盐泵转速范围为2750~3150 rpm。泵的扬程、效率均随输送熔盐粘度的增大而减小。泵的扬程对输送LiCl-KCl熔盐密度的变化不敏感,随密度增大,泵的功率和效率均上升,相同条件下熔盐粘度对泵性能的影响大于密度。本文结果可为干法后处理高温熔盐泵设计和实验的改进提供参考。
Numerical simulations are carried out to study the process of LiCl-KCl molten salt transported by high-temperature molten salt centrifugal pump for dry reprocessing of spent fuel under different operating conditions and physical parameters.Based on Fluent numerical simulation software,the standard k-εturbulence model is selected,and the coupled pressure and velocity are adopted by Coupled algorithm to compare the pump’s variation of hydraulic performance and internal flow field.The results showed that the pressure and velocity distribution pattern of the internal flow field,and the direction of the external characteristic curve of the molten salt pump are consistent.Under the same flow conditions,the larger the speed,the greater the pump head and power.As the speed increases,the best efficiency point of the pump is shifted to the high flow conditions and the recommended speed range for dry reprocessing molten salt pump is 2750~3150 rpm.The pump head and efficiency decrease as the viscosity of the transported molten salt increases.As the density of the molten salt being transported increases,the power and efficiency of molten salt pump increases,the head of pump is irrelevant,and the effect of the change in viscosity of the molten salt on the pump performance is greater than the change in density.The paper could provide reference for the design of dry reprocessing high-temperature molten salt pump and improvement of working conditions.
作者
钱宾杰
王赛
陈永利
张磊
林如山
叶国安
唐洪彬
Qian Binjie;Wang Sai;Chen Yong li;Zhang Lei;Lin Rushan;Ye Guoan;Tang Hongbin(Institute of Radiochemistry,China Institute of Atomic Energy,Beijing 102413,China)
出处
《广东化工》
CAS
2024年第2期23-28,10,共7页
Guangdong Chemical Industry
关键词
乏燃料干法后处理
熔盐泵
数值模拟
操作条件
物性参数
dry reprocessing of spent fuel
molten salt pump
numerical simulation
operating conditions
physical parameters
