摘要
为更好地理解和掌握熔盐换热器的运行特征,并给熔盐堆中换热器的设计和运行累积经验,本文以美国橡树岭国家实验室10 MWt熔盐实验堆(Molten Salt Reactor Experiment,MSRE)用的主换热器为研究对象,基于该换热器的设计参数,应用管壳式换热器的理论计算方法(包括Kern方法和Bell-Delaware方法)、换热器设计软件HTRI Xchanger Suite和计算流体力学方法(Computational Fluid Dynamics,CFD)对换热器的关键性能指标(如换热系数、压降和换热功率)分别进行了计算分析,并与MSRE主换热器的实验数据进行比较分析。结果表明:两种理论计算方法(Kern方法、Bell-Delaware方法)、HTRI软件及CFD仿真模拟的结果与实验结果的差异均在可接受范围内。其中,Kern方法与MSRE实验所得的换热量相差最大,约为15%;HTRI软件模拟与MSRE实验所得的总换热系数相差最小,为0.16%。理论计算方法、换热器设计软件及CFD仿真均在不同程度上适用于熔盐-熔盐换热器设计,且CFD仿真还可以对换热器内部传热和流动细节进行直观描述。
[Background]The primary heat exchanger(PHX)used in the 10 MWt Molten Salt Reactor Experiment(MSRE)at Oak Ridge National Laboratory(ORNL),is a U-tube heat exchanger,where the shell side(hot side)contains the fuel salt from the primary loop and the tube side(cold side)carries the coolant salt from the secondary loop.[Purpose]This study aims to deepen the understanding and mastery of the operational characteristics of molten salt heat exchangers,and to accumulate experience in their design and operation within molten salt reactors.[Methods]Firstly,based on the design parameters,the MSRE-PHX was modeled,and theoretical calculations for shell and tube hear exchanger were conducted using the Kern method and the Bell-Delaware method.Then,software simulations were performed using HTRI Xchanger Suite,and computational fluid dynamics(CFD)simulations were also carried out with Ansys Fluent.Finally,critical performance metrics,such as the heat transfer coefficient,the pressure drop,and the heat transfer power,were obtained and compared to the MSRE operation data.[Results]The comparison results indicate that the discrepancies from theoretical calculations,HTRI software,and CFD simulations,are all within acceptable margins to the experimental data.Notably,the greatest variance is found with the Kern method,which showed a deviation in heat transfer quantity of about 15%,while the smallest discrepancy is observed in the overall heat transfer coefficient calculated using HTRI software,differing by merely 0.16%from the experimental data.[Conclusions]All of the methods are suitable and applicable for designing and studying a molten salt shell and tube heat exchanger.Moreover,the CFD simulation can provide fine localized details of the heat transfer and flow of the molten salt fluid.This offers substantial theoretical support and practical guidance for the future design and improvement of molten salt heat exchangers.
作者
崔蕾
陈玉爽
李启明
钟雨
孙强
郭威
蔡翔舟
CUI Lei;CHEN Yushuang;LI Qiming;ZHONG Yu;SUN Qiang;GUO Wei;CAI Xiangzhou(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《核技术》
EI
CAS
CSCD
北大核心
2024年第7期148-160,共13页
Nuclear Techniques
基金
甘肃省科技重大专项"钍基熔盐堆关键装备与技术开发"(No.23ZDGH001)
中国科学院战略先导专项(No.XDA02010000)资助。
