硝酸盐自然循环回路系统特性分析  

Characteristics analysis of nitrate salt natural circulation loop

作　　者：王凯[1] 蔡创雄[1] 何兆忠[1] 陈堃[1] 

机构地区：[1]中国科学院上海应用物理研究所嘉定园区,上海201800

出　　处：《核技术》2015年第4期67-73,共7页Nuclear Techniques

基　　金：中国科学院战略性先导科技专项(No.XDA02050100)资助

摘　　要：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。Background： Nitrate salt natural circulation loop （NNCL） system is an important platform for studying molten salt natural circulation characteristic. And the foundation for the design and verification passive residual heat removal system in the fluoride slat-cooled high temperature reactor might be obtained in this platform. Purpose： This study aims to analyze characteristics of NNCL system under different heating power, air flow, etc. Methods： The RELAP5/MOD4.0 code was employed with modification of applicability for NNCL. Simulation was performed for the NNCL system under various running conditions. Results： The calculation results show that air flow has an important effect on NNCL mass flow rate and an inverse relationship with mass flow rate; the steady temperature and mass flow rate of NNCL will increase with the heating power and the steady mass flow rate of NNCL will decrease with the air inlet temperature; NNCL system needs a long time to get a steady state, about 8-27 h. In order to keep the nitrate salt in liquid and not deteriorate, power should be limited in 20-40 kW at the rated air mass flow rate. Conclusion： Heating power and air mass flow rate are the most important factors to effect of the NNCL steady state, which can influence the temperature and the mass flow rate of NNCL system.

关 键 词：自然循环 RELAP5/MOD4.0 非能动余热排出 硝酸盐 

分 类 号：TL364.4[核科学技术—核技术及应用]