Low-temperature control device for analyzing hydrogen isotope by gas chromatography

Abstract

The invention relates to a low-temperature control device for analyzing hydrogen isotope by gas chromatography. The low-temperature control device comprises a refrigeration mechanism, a cold head kit, a chromatographic column and a chromatographic instrument. The chromatographic instrument is connected with the chromatographic column; a cold head of the refrigeration mechanism is connected with the chromatographic column to provide a cold source; the chromatographic column is used for separating gas components; and the chromatographic column is arranged in the cold head kit. The low-temperature control device for analyzing the hydrogen isotope by the gas chromatography has the beneficial effects that the structure of the cold head, the chromatographic column and the connecting pipe of the pulse tube type refrigerator is adopted, a cold source is provided by the pulse tube type refrigerator, a mode of maintaining relatively low heat leakage under vacuum is adopted, and the temperature of the chromatographic column can be set to be in a range of 40K to room temperature through the controller; liquid nitrogen does not need to be supplemented, and possibility is provided for automatic control of the ash discharge gas analysis process. And meanwhile, the temperature is adjusted within the range of -40K to room temperature , so that the possibility is provided for optimizing the chromatographic condition of hydrogen isotope analysis.

Description

technical field [0001] The invention belongs to the field of hydrogen isotope analysis, and in particular relates to a low-temperature control device for analyzing hydrogen isotope by gas chromatography. Background technique [0002] The analysis of hydrogen isotopes by gas chromatography is widely used in the ash gas measurement process of ITER. A critical factor in chromatographic quantitation is column temperature. [0003] The hydrogen isotope components need to be separated at low temperature. At present, in the prior art, a column thermostat is used to increase the column temperature to keep the column temperature stable, which cannot meet the low temperature requirement for the separation of hydrogen isotope components. For this reason, in the field, the chromatographic analysis column is usually placed in a self-made liquid nitrogen container, and the low temperature environment and separation are provided by soaking the chromatographic column with liquid nitrogen....

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Problems solved by technology

[0004] However, during the analysis process, due to factors such as liquid nitrogen volatilization and air flow heat transfer, the liquid nitrogen level will change, and the change in liquid level will cause the column temperature of the chromatographic column to change, making the reproducibility of the quantitative results worse. The method of liquid level monitoring and timely replenishment is cumbersome and difficult to achieve program control; and the separation temperature is limited to the temperature of liquid nitrogen and cannot be adjusted, which limits the optimization of column temperature conditions

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