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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 design and construction of a differential aspiration measuring system which can be used to quantitatively analyze the ash emission of EAST tokamak is introduced. During the test, the system can work normally in the range of 10 ~ (-) 3 ~ 10 ~ 5Pa The gas composition of EAST ash was studied using this system. The results show that the total gas absorbed by the external cryogenic pump is about 1371.8 Pa · m -3 in one discharge of EAST normal plasma, in which hydrogen and its isotope deuterium 91.5%. Other impurity gases mainly include 6.6% H_2O, 0.83% N_2 / CO, 0.39% O_2, 0.34% CO_2 and 0.059% oil. The experiment also found that the desorbed gas The proportion of H + D in the fuel gas is greater than 99.9%, while the desorption of other impurities mainly occurs after 150K. Therefore, the separation of the fuel gas and the impurities can be completed by separating the gas <120 K before the cryogenic pump warm-up to obtain the fuel gas with the purity of> 99.9%. The results of this study provide a simple and feasible method for further purification and recovery of fuel gas.