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

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

收稿日期:2020-07-14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:沙海东(1991-),男,河北省唐山市人,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)

Simulation and Optimization of Ultra-High Purity Krypton/Xenon Cryogenic Distillation System Based on HYSYS

SHA Haidong¹, HUANG Peiyao³, WANG Zhou⁴, CUI Xiangyi⁵, JU Yonglin²(), YAN Rui², LI Shuaijie⁴, WANG Xiuli²

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

Received:2020-07-14Online:2021-07-28Published:2021-07-30
Contact:JU Yonglin E-mail:yju@sjtu.edu.cn

摘要/Abstract

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n_Kr/n_Xe≤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.
关键词: 低温精馏, 暗物质探测, HYSYS模拟
Abstract: To meet the requirements of the low background and high sensitivity of the large-scale dark-matter detector PandaX-4T, n_Kr/n_Xe≤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.
Key words: cryogenic distillation, dark matter detection, HYSYS simulation


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