EAST排灰气成分及燃料气体提纯研究  

Concentrations and Recycling of Exhaust Gases Released from Experimental Advanced Superconducting Tokamak

作　　者：沈国清[1,2] 余耀伟[1] 胡建生[1] 

机构地区：[1]中国科学院等离子体物理研究所,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《真空科学与技术学报》2017年第5期466-470,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家磁约束核聚变能研究专项资助(2014GB106005;2013GB114004)

摘　　要：介绍了一套可用于定量分析EAST托卡马克排灰气所需要的差分抽气测量系统的设计和搭建,在测试过程中该系统可以在10^(-)3~10~5Pa范围内正常工作;利用该系统研究了EAST排灰气的气体成分,结果显示EAST正常等离子体一天放电中,外置低温泵所吸附的气体总量约为1371.8 Pa·m^3,其中氢及其同位素氘占91.5%,其他的杂质气体主要包括:6.6%H_2O、0.83%N_2/CO、0.39%O_2、0.34%CO_2以及0.059%油;实验还发现外置低温泵回温再生到120 K时,解吸的气体中燃料气体H+D所占比例大于99.9%,而其他杂质的解吸主要发生在150 K之后。因此可以通过在低温泵回温过程中将<120 K之前的气体单独分离出来,即可完成燃料气体与杂质的分离,获得纯度>99.9%的燃料气体。该研究结果对进一步实现燃料气体提纯和回收提供了一种简单、可行的方法。The differential pumping system （DPS） was developed and tested,which is ca Pable of working in 10-3 - 105 Pa range and dedicated to quantitative characterization of the exhaust gas concentrations released from Experimental Advanced Superconducting Tokamak（EAST）. The preliminary results show that the total exhaust gases,released daily after plasma discharge from 10 external eryo-pumps installed in EAST,were up to 1371.8 Pa · m3,mainly consisting of 91.5% of H2/D2 desorbed below 120 K and the conventional residue gases desorbed at temperatures above 150 K,including but not limited to 6.6% of H2O,0. 83% of N2/CO ,0. 39% of 02 ,0.34% of CO2 and 0. 059% of hydrocarbons. We found that the 99.9% pure fuel gasesof H2/D2 can be easily se Parated from the impurity gases at a temperature below and/or around 120 K.

关 键 词：差分抽气系统 排灰气 气体提纯 EAST托克马克 

分 类 号：TL628[核科学技术—核技术及应用]