中国散裂中子源2 K氦制冷机参数敏感性分析  

Parameter sensitivity analysis of 2 K helium refrigerator in China Spallation Neutron Source

作　　者：史敏 叶斌[1,2] 孟杨 杨瑜 李娜 刘华昌[1,2] 曹菁 Shi Min;Ye Bin;Meng Yang;Yang Yu;Li Na;Liu Huachang;Cao Jin(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523803,China)

机构地区：[1]中国科学院高能物理研究所,北京100049 [2]散裂中子源科学中心,东莞523803

出　　处：《低温与超导》2024年第11期60-65,共6页Cryogenics and Superconductivity

基　　金：东莞松山湖大科学装置(散裂中子源)开放课题计划(KFKT2022A08)资助。

摘　　要：在中国散裂中子源二期工程中,将建设一套2 K氦制冷机,为H-直线加速段新增的超导加速器提供超流氦冷却环境。根据设备布局,2 K氦制冷机的4.5 K和2 K冷箱通过100 m多通道低温管线连接,这对制冷机的节流级和过冷级产生了显著影响。本文基于参数敏感性分析,分析了4.5 K冷箱中一级过冷器超临界氦出口温度、第一节流级膨胀元件的种类、第一节流级的出口压力对系统的影响。结果表明,在4.5 K冷箱中增加一级过冷器并将超临界氦出口温度降至4.5 K,能显著减少传输氦流的质量流量,从而降低了多通道低温管线的制造成本和安装难度。此外,设计第一级过冷器时应以透平为第一节流级膨胀元件的工况为准,设计第二级过冷器时则应以节流阀为准。In the second phase of China Spallation Neutron Source project(CSNS),a 2 K helium refrigerator will be constructed to provide a superfluid helium cooling environment for the newly added superconducting accelerator in the H-linear accelerator section.According to the equipment layout,the 4.5 K and 2 K cold boxes of the 2 K helium refrigerator will be connected by a 100-meter multi-channel low-temperature pipeline,which significantly affects the throttling stage and subcooling stage of the refrigerator.Based on parameter sensitivity analysis,It was examined for the impacts of the supercritical helium outlet temperature of the first stage subcooler in the 4.5 K cold box,the type of expansion element for the first throttling stage and the outlet pressure of the first throttling stage on the system.The results indicate that adding a first stage subcooler in the 4.5 K cold box and lowering the supercritical helium outlet temperature to 4.5 K can significantly reduce the mass flow rate of the helium,thereby decreasing the manufacturing cost and installation difficulty of the multi-channel low-temperature pipeline.Additionally,when designing the first stage subcooler,the turbine should be considered as the expansion element for the first throttling stage;for the second stage subcooler,the design should be based on the throttling valve.

关 键 词：氦制冷机 超临界氦 节流级 过冷级 参数敏感性分析 

分 类 号：TB651[一般工业技术—制冷工程] TB657