摘要
熔盐反应堆(Molten Salt Reactor,MSR)一般采用高温熔融氟盐或氯盐作为流体传热介质,熔盐泄漏事故是影响熔盐堆安全运行的重要因素之一。本文基于计算流体力学(Computational Fluid Dynamics,CFD)模型,使用ANSYS FLUENT模拟软件,研究了氟盐泄漏到石英砂层后的扩散渗透和凝固熔化现象。研究发现:熔盐泄漏至砂层后在砂层表面和内部扩散渗透,由于环境冷却和砂层温度分布,泄漏熔盐底部区域将逐渐凝固,使得熔盐在砂层内轴向的渗透深度逐渐稳定,泄漏的熔盐只在砂层表面附近径向扩散。对于确定时间的熔盐泄漏,熔盐随着出口温度和泄漏流量的升高,其径向上扩散半径和轴向的渗透深度也随之增加。基于上述结果,本文提出了一种熔盐堆氟盐泄漏事故下熔盐的收集与隔热方案,并通过分析证实了方案的有效性。
[Background]The high temperature molten salt is generally used as the heat transfer medium in molten salt reactor(MSR),and the molten salt leakage accident is a crucial issue for the safety of reactor operation.[Purpose]This study aims to investigate the characteristics of molten salt leakage and solidification and to provide effective measures to reduce the risk of molten salt leakage accidents.[Methods]Based on the computational fluid dynamics(CFD)model,the leakage of molten fluoride salt flow onto the quartz sand and subsequently phenomena including permeation,spreading,melting and solidification were studied by using ANSYS FLUENT code.[Results]The results show that the molten salt diffuses both vertically and horizontally after contacting the sand,due to the cooling of ambient and temperature gradient of the sand,the bottom of molten salt in the sand will freeze,making the vertical permeation depth stabilized and the liquid molten salt will only spread horizontally on the top surface of sand.For a certain period of molten salt leakage,the higher the molten salt temperature and leakage flow rate,the larger the maximum diffusion radius of horizontal detection and permeation depth in vertical direction.[Conclusions]Based on above analysis,a method with respect to the collection and thermal insulation of high temperature molten salt under leakage accident is proposed,and analyzed to verify the effectiveness of the method.
作者
王允
田健
周翀
王纳秀
WANG Yun;TIAN Jian;ZHOU Chong;WANG Naxiu(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》
CAS
CSCD
北大核心
2021年第10期55-61,共7页
Nuclear Techniques
基金
中国科学院战略先导专项(No.XDA0201002)
中国科学院青年创新促进会(No.2018301)资助。
关键词
熔盐堆
氟盐
泄漏
凝固
Molten salt reactor
Fluorides
Leakage
Solidification
作者简介
第一作者:王允,男,1986年出生,2012年毕业于哈尔滨工程大学,现为博士研究生,主要研究领域为核反应堆热工水力;通信作者:田健,E-mail:tianjian@sinap.ac.cn。
