面向聚变堆排灰气的直线型水银扩散泵抽气性能DSMC模拟研究  

DSMC Simulation Study on the Pumping Performance of Linear Mercury Diffusion Pump for Exhaust Gas of Fusion Reactor

作　　者：廖泽宇 毛世峰[1] 赵长莲 叶民友[1] LIAO Ze-yu;MAO Shi-feng;ZHAO Chang-lian;YE Min-you(School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230027,China;38th Research Institute of China Electronics Technology Group Corporation,Hefei 230001,China)

机构地区：[1]中国科学技术大学核科学技术学院,安徽合肥230027 [2]中国电子科技集团公司第三十八研究所,安徽合肥230001

出　　处：《真空》2022年第2期26-31,共6页Vacuum

基　　金：国家重点研发计划(2017YFE0301501);中国科学院合肥大科学中心协同创新培育基金项目(2020HSC-CIP015)。

摘　　要：在德国卡尔斯鲁厄理工学院提出的KALPUREX(Karlsruhe liquid metal based pumping process for fusion reactor exhaust gases)流程中,利用直线型水银扩散泵实现对聚变堆排灰气的连续抽气,从而解决使用捕集式低温泵带来的高氚滞留量问题。为了支持直线型水银扩散泵的设计研究,基于直接模拟蒙特卡洛方法开展了直线型水银扩散泵的抽气性能模拟研究。基于早期实验中的直线型水银扩散泵结构,模拟了空气的抽气速率及水银返流率,并分析了其随压强变化的原因。针对聚变堆排灰气中可能包含的氢(作为氢同位素的代表)、氦、氖、氩等气体,分别模拟了直线型水银扩散泵的抽气性能。模拟得到的不同气体的抽气速率与气体摩尔质量间的关系基本符合理论预测。In the KALPUREX( Karlsruhe liquid metal based pumping process for fusion reactor exhaust gases) process proposed by Karlsruher Institut für Technologie(KIT), the linear mercury diffusion pump(LMDP) is used for the exhaust gas of fusion reactor to realize continuously pumping, so as to solve the problem of high tritium inventory caused by the use of the cryogenic pump. In order to support the design of LMDP, the pumping performance of LMDP is simulated based on the Direct Simulation Monte Carlo(DSMC) method. Based on the structure of LMDP in the early experiment, the pumping speed of air and the back-streaming rate of mercury are simulated, and their relationships with the pressure are analyzed. For hydrogen(as the representative of hydrogen isotope), helium, neon and argon, which would be contained in the exhaust gas of fusion reactor, the pumping performance of LMDP is simulated respectively. The relationship between the pumping speeds of different gases and their molar mass is consistent between the simulation result and the theoretical prediction.

关 键 词：聚变堆排灰气 直接模拟蒙特卡洛 直线型水银扩散泵 抽气速率 返流率 

分 类 号：TB752.3[一般工业技术—真空技术]