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熔盐自然循环回路是为研究熔盐的自然循环特性,支持先进熔盐堆非能动安全系统设计而建造的实验装置。熔盐在回路中的热量损失对于自然循环的建立和保持具有重要的影响。本文以熔盐储罐为代表部件,通过实验得到了其热量损失的数据,并利用数值模拟的方法,计算了不同温度下储罐各部分的热损失,分析了储罐热损失规律,拟合得到了热损失随温度及时间的变化关系。对比熔盐在不同温度下热损失的实验值和计算值,发现两者吻合良好,相对误差均小于10%。分析结果表明,内插式电加热器是储罐主要热损失途径之一,并导致了熔盐的温度分层。
Molten salt natural circulation loop is an experimental device designed to study the natural circulation characteristics of molten salt and support the design of passive molten salt reactor passive safety system. The heat loss of molten salt in the circuit has a major impact on the establishment and maintenance of the natural circulation. In this paper, the molten salt storage tank as the representative part, the heat loss data obtained by experiments, and the use of numerical simulation method to calculate the heat loss of various parts of the tank at different temperatures, analysis of the tank heat loss rules, fitting The relationship between heat loss and temperature and time is obtained. Comparing experimental results and calculated values of heat loss of molten salt at different temperatures, we found that the two agree well with relative errors less than 10%. The analysis results show that the inserted electric heater is one of the main heat loss ways of the storage tank and leads to the temperature stratification of the molten salt.