双面冷却熔盐堆组件热工分析程序开发与验证  

Development and validation of a thermal-hydraulic analysis code for dual cooled assemblies in molten salt reactors

作　　者：胡思勤 周翀 朱贵凤[1,2] 邹杨 余笑寒[1,2] 薛帅钰 HU Siqin;ZHOU Chong;ZHU Guifeng;ZOU Yang;YU Xiaohan;XUE Shuaiyu(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049

出　　处：《核技术》2024年第9期121-134,共14页Nuclear Techniques

基　　金：中国科学院战略性先导科技专项名称(No.XDA02010200,No.XDA22010501);中国科学院青年创新促进会(No.2018301);国家重点研发计划(No.2020YFB1902000)资助。

摘　　要：新型液态燃料熔盐堆双面冷却组件相比传统熔盐堆组件具有更大的换热面积和更短的石墨导热距离,因而具有更低的石墨温度热点,然而由于其不同的几何结构特征和熔盐自发热特性,组件内存在独特的热量分配和冷却剂流量分配的问题。为准确高效评估新型组件的热安全边界,有必要开发新的计算分析工具。本研究基于MATLAB开发了适用于熔盐堆双面冷却组件的一维稳态热工分析程序THDA-MSR(Thermal-Hydraulic Analysis Code for Dual Cooled Assembly-Molten Salt Reactor),考虑熔盐自发热的特点,建立了组件内外流道内熔盐的一维温度分布模型和熔盐石墨对流换热模型以及石墨导热模型,根据并联通道压损相等原则建立流量分配模型,通过CFD(Computational Fluid Dynamics)数值模拟对程序计算结果进行了验证,并初步分析了各结构参数对组件最大熔盐出口温度和石墨温度热点的影响。THDA-MSR的计算结果与CFD结果吻合较好,压损偏差小于4.84%,石墨温度热点偏差小于0.15%,分析结果发现:外通道截面积占总流道截面积比是影响最大熔盐出口温度和石墨温度热点的关键参数。以上研究结果表明,自编程序能很好地预测组件流量分布、组件压损、熔盐温度分布和石墨温度热点。THDA-MSR能够应用于熔盐堆双面冷却组件热工水力性能分析评估,对于组件选型设计有较大工程参考价值。[Background]Compared with traditional components,novel dual cooled assemblies for liquid-fuel molten salt reactors demonstrate a lower graphite hot spot temperature owing to their increased heat transfer area and reduced graphite thermal conduction distance.However,owing to the distinct geometric characteristics and spontaneous heating of liquid fuel,unique heat division and flow distribution patterns occur between the internal and external channels in dual cooled assemblies.[Purpose]This study aims to develop new computational analysis tools to estimate the thermal-hydraulic performance of these assemblies.[Methods]This study developed a onedimensional steady-state thermal-hydraulic analysis code,namely Thermal-Hydraulic Analysis Code for Dual Cooled Assembly-Molten Salt Reactor(THDA-MSR)using the MATLAB platform.Considering the spontaneous heating of the fuel salt,a one-dimensional temperature distribution model for liquid fuel and a he at transfer model between the fuel salt and graphite were established.A flow distribution model was developed based on the principle of equal pressure drops in parallel channels.Additionally,numerical simulations were performed using computational fluid dynamics(CFD)software to validate the code results.[Results]The study demonstrates a strong agreement between the THDA-MSR and CFD results,with a pressure drop deviation and maximum graphite temperature deviation below 4.84% and 0.15%,respectively.The analysis shows that the ratio of the external channel is the key parameter affecting the maximum outlet temperature of the fuel salt and the maximum temperature of graphite.[Conclusions]The model is applicable for thermal-hydraulic calculations and analysis of dual cooled assemblies in liquid-fuel molten salt reactors.

关 键 词：液态燃料 熔盐堆 双面冷却组件 热工性能 流量分配 

分 类 号：TL334[核科学技术—核技术及应用]