严锐¹, 王舟², 崔祥仪³, 巨永林¹(), 沙海东⁴, 李帅杰², 黄沛尧⁵, 王秀丽¹

1.上海交通大学 制冷与低温工程研究所, 上海 200240
2.上海交通大学 粒子与核物理研究所,上海 200240
3.上海交通大学 李政道研究所, 上海 200240
4.上海电力大学 能源与机械工程学院,上海 200090
5.上海交通大学 巴黎高科卓越工程师学院, 上海 200240

收稿日期:2020-06-15出版日期:2021-07-28发布日期:2021-07-30
通讯作者:巨永林E-mail:yju@sjtu.edu.cn
作者简介:严 锐(1995-),女,重庆市人,硕士生,研究方向为低温精馏与低温传热
基金资助:国家重点研发计划(2016YFA0400301);上海市科学技术委员会重点基础研究项目(18JC1410200)

Operation Analysis of PandaX-4T Ultra-High Purity Xenon Cryogenic Distillation System for Removal of Krypton

YAN Rui¹, WANG Zhou², CUI Xiangyi³, JU Yonglin¹(), SHA Haidong⁴, LI Shuaijie², HUANG Peiyao⁵, WANG Xiuli¹

1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China
2. Institute of Nuclear and Particle Physics, Shanghai Jiao Tong University, Shanghai 200240, China
3. Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China
4. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
5. Paris Tech Elite Institute of Technology, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2020-06-15Online:2021-07-28Published:2021-07-30
Contact:JU Yonglin E-mail:yju@sjtu.edu.cn

摘要/Abstract

摘要： PandaX-4T实验组通过McCabe-Thiele(M-T)方法及质量、能量守恒,设计研制出将商业氙中氪的摩尔分数由5×10^-7降低至1×10^-14的高效低温精馏系统.该超高纯氪氙低温精馏系统已完成离线提纯运行,现需要对其运行状态进行深入分析.通过对系统各个运行阶段的温度、压力、流量及产品氙的摩尔分数等参数进行分析,研究该超高纯氪氙低温精馏系统的稳定性和提纯性能.该低温精馏系统在回收率为99%、提纯速率为10 kg/h的条件下稳定运行1.5 m,共提纯5.75 t氙.实验数据表明,系统在各运行阶段状态稳定、安全可靠,产品氙中氪的摩尔分数小于7.99×10^-12.PandaX-4T超高纯氪氙低温精馏系统的运行分析具有理论研究价值和工程实际意义,同时也是优化下一阶段精馏提纯运行非常重要的参考依据.
关键词: 低温精馏, 超高纯氙, 氪, 暗物质探测
Abstract: Based on the McCabe-Thiele (M-T) method and the conservation of mass and energy, the PandaX-4T collaboration group designs an efficient cryogenic distillation system to reduce the mole fraction of krypton in commercial xenon from 5×10^-7 to 1×10^-14. Since the ultra-high purity xenon cryogenic distillation system has completed the offline purification operation, it is necessary to conduct the corresponding operation analysis. Therefore, the stability and purification performance of the ultra-high purity xenon cryogenic distillation system are studied by analyzing the parameters such as temperature, pressure, flowrate, and mole faction of the product xenon in each operating stage. The PandaX-4T cryogenic distillation system has been operating stably for 1.5 m at a collection efficiency of 99% and a purification rate of 10 kg/h, and has purified 5.75 t of xenon. The experimental data show that the system is stable, safe, and reliable in all stages of operation, and the krypton concentration in product xenon is less than 7.99×10^-12. The operation analysis of the PandaX-4T ultra-high purity xenon cryogenic distillation system has a theoretical research value and practical engineering significance, providing very important reference for optimization of distillation operation of the next stage.
Key words: cryogenic distillation, ultra-high purity xenon, krypton, dark matter detection


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