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硝酸盐自然循环回路(Nitrate natural circulation loop,NNCL)是研究熔盐自然循环特性的重要实验平台,可为氟盐冷却高温堆的非能动余热排出系统设计和验证积累经验。通过修改RELAP5/MOD4.0程序,对NNCL进行了系统分析,分析了不同加热功率、空气流量和入口温度等情况下的系统特性。结果表明,加热功率和空气流量是影响NNCL系统平衡温度和质量流量的重要因素,对系统稳态时的温度和流量有很大影响;自然循环达到稳定时所需时间较长,不同工况下需要8-27 h的稳定时间;在空气设计流量下,为了防止硝酸盐因温度过高而变质或因温度过低而凝结,加热功率应保持在20-40 k W。
Nitrate natural circulation loop (NNCL) is an important experimental platform for studying the natural circulation characteristics of molten salt. It can gain experience in the design and verification of passive residual heat removal system for high temperature salt fluoride cooling stacks. By modifying RELAP5 / MOD4.0 program, NNCL was systematically analyzed, and the system characteristics under different heating power, air flow rate and inlet temperature were analyzed. The results show that heating power and air flow rate are important factors that affect the equilibrium temperature and mass flow rate of NNCL system and have a great influence on the temperature and flow rate at steady state of the system. The time required for the natural circulation to reach a steady state is longer and under different operating conditions A stabilization time of 8-27 h is required; at the design flow of air, the heating power should be maintained at 20-40 kW in order to prevent nitrates from degenerating due to overheating or condensing due to low temperatures.