氦中痕量杂质气体气相色谱检测分析方法研究

为实现聚变堆氘氚燃料工艺气中痕量杂质气体组分的快速检测分析，需建立特殊的高精度在线气相色谱检测分析方法。以高纯氦作为载气，在不同的色谱柱温度和载气流速控制下，通过分子筛毛细管柱和PLOT-Q柱进行分离，采用放电氦离子化检测器（DID）进行检测，对氦中含量为1、10以及100 ppm的杂质标准气体进行检测分析。结果表明：在柱温为40 ℃、流速为15～20 mL/min实验条件下，分子筛柱在160 s内能够实现H₂、O₂、N₂、CH₄和CO全部分离，且柱效较高，响应值的重复性较好，H₂和O₂之间的分离度高于1.5，实现了完全分离；在柱温为40 ℃、流速为20 mL/min时，PLOT-Q柱分离CO₂组分效果最佳。

Analysis of Trace Impurity Components in Helium by Gas Chromatography

It’s necessary to establish a high-precision analytical method of gas chromatography for achieving the rapid detection of trace impurity components in process gas of fusion reactors. The separation of impurities relied on capillary column of molecular sieve and PLOT-Q under different column temperature and the flow rate of carrier gas, respectively, with the impurity concentrations of 1, 10 and 100 ppm in standard gas and the application of discharge ionization detector (DID) in high purity helium. The studies show that the separation of H₂, O₂, N₂, CH₄ and CO with the capillary column of molecular sieve achieves in 160 s with high column efficiency and good repeatability, while the column temperature is 40 ℃ and the flow rate is 15 mL/min to 20 mL/min, the resolution between H₂ and O₂ is more than 1.5, which can achieve complete separation. The experiment conditions with column temperature of 40 ℃ and the flow rate of 20 mL/min fit to separate CO₂ with the column of PLOT-Q.