摘要
为满足大型暗物质探测器PandaX-4T低本底及高灵敏度的要求,探测介质氙(Xe)中氪(Kr)含量要求为nKr/nXe≤1×10^(-13)(n为物质的量).本文以超高纯氙去除氪低温精馏塔为例,首先简单介绍精馏塔及其结构设计.其次,对该塔的精馏塔参数进行HYSYS模拟及优化,得出现有运行工况下精馏塔内压力、温度以及氪浓度的分布,并研究了进料位置、回流比、进料流量、再沸器加热量、废品氙流量及进料压力等操作因素对精馏纯度的影响.提出优化提纯效果的精馏操作参数,即塔压为221 kPa、回流比为145时,原料氙中氪含量可从5×10^(-7)提纯到4.1×10^(-14),这对超高纯氙去除氪低温精馏的产品纯度进一步提高有重要指导意义.
To meet the requirements of the low background and high sensitivity of the large-scale dark-matter detector PandaX-4 T,nKr/nXe≤1×10^(-13)(n is the amount of substance)is required.The ultra-high purity krypton/xenon cryogenic distillation tower was used as an example in this paper.First,the distillation tower and the construction design of the distillation system were briefly introduced.Then,the operation parameters of the distillation tower were simulated and optimized by using HYSYS,and the distributions of the pressure,temperature and Kr concentration in the distillation tower were obtained.After that,the influences of those operational conditions including the feeding point position,the reflux ratio,the feeding flowrate,the heat of the reboiler,the flowrate of the off-gas,and the feeding pressure to the xenon purity of the distillation system were studied,and the optimized operation parameters were proposed.When the column pressure is set at 221 kPa and the reflux radio is set at 145,the krypton content in xenon can be purified from 5×10^(-7) to 4.1×10^(-14),which has an important guiding significance for further improvement of the purity of the xenon product of the xenon/krypton cryogenic distillation system.
作者
沙海东
黄沛尧
王舟
崔祥仪
巨永林
严锐
李帅杰
王秀丽
SHA Haidong;HUANG Peiyao;WANG Zhou;CUI Xiangyi;JU Yonglin;YAN Rui;LI Shuaijie;WANG Xiuli(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai 200240,China;Paris Tech Elite Institute of Technology,Shanghai Jiao Tong University,Shanghai 200240,China;Institute of Particle and Nuclear Physics,Shanghai Jiao Tong University,Shanghai 200240,China;Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2021年第7期842-849,共8页
Journal of Shanghai Jiaotong University
基金
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)。
关键词
低温精馏
暗物质探测
HYSYS模拟
cryogenic distillation
dark matter detection
HYSYS simulation
