高温钠管道膨胀节设计及性能影响研究  

Research on Design and Influence on Performance of Expansion Joint for High-temperature Sodium Pipe

作　　者：梁胜莹 刘凯[1] 王国芝[1] 刘一哲[1] LIANG Shengying;LIU Kai;WANG Guozhi;LIU Yizhe(Department of Nuclear Engineering Design,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院核工程设计研究所,北京102413

出　　处：《原子能科学技术》2025年第S1期128-133,共6页Atomic Energy Science and Technology

基　　金：中核集团集中研发项目。

摘　　要：快堆电站钠管道上设置膨胀节来吸收热补偿位移,可降低管道、支吊架布置难度,有效缩短钠管道长度和弹簧支吊架数量,实现设备紧凑化布置,缩小工艺间尺寸,提高经济性。为了支持一体化快堆工程建设,需对高温钠管道膨胀节开展设计研究。根据相关规范,采用公式法对膨胀节关键结构参数进行设计计算,研究了膨胀节关键结构参数对膨胀节长度、吸收位移和刚度等性能的影响。研究发现,膨胀节壁厚、波纹平均半径、波高对膨胀节的性能均有不同程度影响,计算结果表明,随波距的增加,膨胀节最大可吸收轴向位移也逐渐增加。当波距一定时,随波高的增加,膨胀节最大可吸收轴向位移也会增加。在设计膨胀节时可适当增加波高,以降低刚度。若膨胀节吸收的位移越大,相应的疲劳次数减少。在满足最小疲劳寿命需求下,单位波纹展开长度吸收位移越大,膨胀节的总长度越小,可提高膨胀节制造经济性。综上,膨胀节的结构参数影响膨胀节的吸收位移、刚度、疲劳寿命等性能。在设计膨胀节时,通过选取合适的波高、波距等结构参数,使膨胀节在满足性能要求基础上提高经济性。Expansion joints are installed on the sodium pipelines of fast reactor power stations to absorb the displacement for thermal compensation.This can reduce the difficulty in the layout of pipelines,supports and hangers,effectively shorten the length of sodium pipelines and reduce the number of spring supports and hangers,thus realizing the compact layout of equipment,reducing the size of the process rooms and improving economic efficiency.To support the construction of the integrated fast reactor project,it is essential to carry out design research on the expansion joints of high-temperature sodium pipes.In accordance with relevant norms and standards,the formulaic approach was utilized to conduct design calculations regarding the key structural parameters of the expansion joints.Moreover,the effects of these key structural parameters on the performance characteristics of the expansion joints,including length,absorbed displacement,and stiffness,were comprehensively explored.The research outcomes disclose that the wall thickness,average radius of corrugations,and wave height of the expansion joints all exert diverse degrees of influence on the performance of the expansion joints.The computational results demonstrate that as the pitch of corrugations rises,the maximum axially absorbable displacement of the expansion joints also progressively augments.When the pitch of corrugations remains constant,an increment in wave height leads to an increase in the maximum axially absorbable displacement of the expansion joints.During the design process of expansion joints,a suitable elevation of wave height can be adopted to diminish the stiffness value.If the expansion joints absorb a greater displacement,the corresponding number of fatigue cycles will be reduced.Under the prerequisite of fulfilling the minimum fatigue life requirement,a larger absorbed displacement per unit corrugation expansion length results in a shorter total length of the expansion joints,thereby enhancing the manufacturing economic viability of the expans

关 键 词：高温钠管道 膨胀节 波高 波距 吸收位移 刚度 

分 类 号：TL364[核科学技术—核技术及应用]