Gas chromatograph and detection method for determining content of impurities in hydrogen

Abstract

The invention discloses a gas chromatograph and a detection method for determining the content of impurities in hydrogen. The gas chromatograph comprises several pneumatic valves, and each pneumatic valve is provided with a corresponding quantitative loop, a carrier gas pipeline and a chromatographic column; each pneumatic valve and the corresponding quantitative ring are connected in series through a sample gas pipeline; the quantitative rings are filled with sample gas, the pneumatic valves are communicated with the corresponding quantitative rings, the carrier gas pipelines and the chromatographic columns to form independent analysis channels through the switching of the pneumatic valves, and the chromatographic columns are connected with the thermal conductivity detector or the flame ionization detector for analysis according to the properties of target components. According to the detection method disclosed by the invention, multiple impurities in the sample can be simultaneouslydetected in the same instrument through one-time sample injection, so the sample consumption, the detection time and the detection cost are saved, the difference of analysis results of different components caused by environmental change and instrument debugging errors is eliminated, and the analysis uniformity and accuracy are improved. The detection accuracy is further improved by optimizing carrier gas composition and setting a standard substance as a control group.

Description

technical field [0001] The proposal belongs to the field of gas analysis, and specifically relates to a gas chromatograph and a detection method for measuring the impurity content in hydrogen. Background technique [0002] In recent years, the global hydrogen energy technology has developed rapidly, and the application of hydrogen energy has become more and more extensive. In particular, hydrogen fuel cell vehicles are currently the key areas for the development of hydrogen energy technology. However, impurities in hydrogen fuel can cause hydrogen fuel cell catalyst poisoning or dilute the hydrogen fuel concentration, resulting in irreversible degradation of fuel cell performance. In GB / T 37244 "Fuel Hydrogen for Proton Exchange Membrane Fuel Cell Vehicles", the content of helium, argon, oxygen, nitrogen, total hydrocarbons, methane, carbon monoxide, and carbon dioxide in hydrogen fuel is strictly limited. Due to the many types of impurities, multiple gas chromatographs wit...

AI Technical Summary

Problems solved by technology

Due to the many types of impurities, multiple gas chromatographs with different detectors are usually used for detection. Not only the investment cost of the equipment is high, but the detection takes a long time. It is inevitable that there will be analysis errors, resulting in the analysis results of multiple samples may not be compared on the same baseline due to the difference in analysis equipment, resulting in errors in the results

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