Development of In-Situ Gas Analyzer for Hydrogen Isotopes in Fusion Fuel Gas Processing

To develop a real time and in-situ process gas analyzer for fusion fuel gas processing systems, application study of laser Raman spectroscopy was performed by measurement of hydrogen isotopes. Using an Ari on type laser of which wavelength 488 nm, power 0.7 W, and single pass irradiation method, Raman spectra of hydrogen isotopes were measured and intensities of the Stokes rotational lines and Q-branch were quantitatively analyzed. The Stokes rotational lines at 587, 443 and 415 cm¹ were selected as suitable ones for quantitative analysis of H₂, HD and D₂. Normalizing the Raman intensity of partial pressure H₂ as 100, relative Raman intensity ratio of H₂:HD:D₂ was obtained as 100:58:47. The detection limit for hydrogen was estimated as 0.05 kPa in partial pressure and 500 ppm in concentration. But multiple pass method further improved the detection limit to 100 ppm.     

Application of Laser Raman Spectroscopy to Analysis of Isotopie C2 Hydrocarbons in Fusion Fuel Gas Processing

Gaseous C₂ hydrocarbons, which would be the major impurities after methane in plasma exhaust gases, were analyzed by laser Raman spectrometry. Deuterated C₂ hydrocarbons, which were prepared by mixing acetylene, ethylene or ethane with D₂ gas were experimentally measured. Suitable bands for quantitative analyses can be selected as the v₂ vibrations at 1,764~1,973 cm^?1, v₂ vibrations at 1,518~1,627 cm^?1 and some V₃ vibrations at 985~1,344 cm^?1, and V₃ vibrations at 842~994 cm^?1, for deuterated acetylenes, ethylenes and ethanes respectively. Those bands are based on the CC stretching vibrations, except for the deformation vibration V₃ of the ethylenes. Isotopie C₂ hydrocarbons in fusion fuel gas processing will be analyzed by using the same bands in laser Raman spectroscopy.     

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。     

氦中痕量H2、D2组分的高精度气相色谱分析

为满足聚变堆氘氚燃料循环工艺气体中痕量氢同位素组分的特殊检测分析要求,需建立快速、高精度的在线分析方法。针对氦中痕量H₂、D₂组分,本工作以高纯氦为载气,在液氮温度下,使用自制改性Al₂O₃毛细管柱进行分离,放电氦离子化检测器进行检测。结果显示,氢氘组分的检测限不高于1×10^-8,保留时间不高于180 s,氢氘组分色谱峰峰面积响应值的相对标准偏差不大于1.0%,分离度大于1.0。本方法具有分析灵敏、快速的优点,为聚变堆包层在氘氚燃料注入系统和氢同位素分离系统中微量氚的安全分析与精确计量提供了一种有效的测量技术。     

Gas Chromatographic Measurements of Hydrogen Isotopes Mixture by Using Catalytic Oxidation Type Detector

A new type of gas chromatograph for quantitative measurements of hydrogen isotopes mixture has been developed through the adoption of catalytic oxidation type detector. Experiments using He as the carrier gas were successfully performed for the separation of D₂-HD and H₂-HD-D₂ mixtures. The minimum detection limits were 0.4–0.9 μl-STP for these components. The linear calibration curves were obtained in the range of 10 μl-STP–20 ml-STP. The sensitivities for H₂, HD and D₂ were 843, 774 and 654 (μl-STP)^?1, respectively. The maximum time needed for the analysis was about 16 min.