基于偏离设计工况运行的稳态考验回路换热能力补偿措施分析研究  

Study on Compensation Measures for Improving the Heat Transfer Capability of the Steady-state Irradiation Test Loop under Deviated Design Conditions

作　　者：斯俊平 童明炎[1] 孙胜[1] 李成业[1] 赵文斌 许裕恒 和佳鑫 SI Junping;TONG Mingyan;SUN Sheng;LI Chengye;ZHAO Wenbin;XU Yuheng;HE Jiaxin(The 1st Sub-institute of Nuclear Power Institute of China,Chengdu of Sichuan Prov.610213,China)

机构地区：[1]中国核动力研究设计院第一研究所,四川成都610213

出　　处：《核科学与工程》2023年第1期133-140,共8页Nuclear Science and Engineering

基　　金：中国核动力研究设计院原则基金(KJCX-2022-XCZ-19)。

摘　　要：稳态高温高压回路的换热能力与辐照参数的匹配性对燃料组件辐照考验的可行性及安全性有着重要的影响。本文研究了在各工况下试验回路换热能力与燃料组件辐照考验热工参数的匹配性问题,并分析了不同换热能力补偿措施的适应性。研究结果表明,当试验回路的运行偏离设计工况,回路中一次水的流量及辐照装置出口温度与主换热器能够实现的最大一次水温降以及最大换热功率之间是存在严格的对应关系。装置出口温度升高以及调节二次水流量对提升主换热器的换热效果不明显,而采用更低温度的二次水可以部分提升换热器的功率。主换热器后端散热方式在总的换热功率能力上要较前端换热强。换热器并联的换热效果并非总是强于单台独立运行,在低流量运行时,设置两台换热器并将其串联是最有效解决换热能力不足的手段,针对换热器一次水入口温度330℃及250℃,两台换热器串联的总换热功率将比单台运行时分别平均提高68.7%和80.4%。本文的研究方法及相应的研究结果可以用于指导燃料组件的稳态回路辐照论证以及考验过程中的试验回路运行参数选择。The matching between the heat transfer capacity of the test loop with the high temperature and pressure and the irradiation parameters has an important impact on the feasibility and safety during the fuel assembly steady-state irradiation.The relationships between the heat transfer capacity of the test loop under various working conditions and the thermal parameters in the fuel assembly irradiation test were studied,meanwhile,the adaptability of different heat transfer capacity compensation measures was also analyzed.It shows that the maximum temperature drops for the primary water and the maximum heat exchange power from the main heat exchanger are determined by the flow rate of the primary water in the loop and the outlet temperature of the irradiation device as the operation of the test loop deviates from the design conditions.The temperature increase in the outlet of the irradiation device and adjusting the secondary water flow have little effect on the power improvement of the main heat exchanger,while the power of the heat exchanger can partially increase with the secondary water temperature decreasing.The heat dissipation method at the back end is stronger than that in the front end of the main heat exchanger in terms of total heat exchange power capacity.The heat exchange effect of parallel heat exchangers is not always stronger than that of a single independent operation.When operating at low flow,it is the most effective way to solve the shortage of heat exchange capacity that two heat exchangers run in series.As the water inlet temperature is 330℃and 250℃,the total heat exchange power of the two heat exchangers in series will increase by 68.7%and 80.4%respectively compared with the single operation.The research methods and the corresponding results can be used to demonstrate the test feasibility and guide operation parameter selection during the fuel assembly irradiation in the test loop.

关 键 词：偏离设计工况 燃料组件 稳态辐照考验 换热能力 

分 类 号：TL352[核科学技术—核技术及应用]