Photoacoustic spectrometry and chromatography spectrometer for trace gas in insulating oil and analysis method

Abstract

The invention discloses a photoacoustic spectrometry and chromatography spectrometer for trace gas in insulating oil and an analysis method. The photoacoustic spectrometry and chromatography spectrometer for the trace gas in the insulating oil and the analysis method are characterized by adopting a photoacoustic spectrometry and chromatography hyphenated technology method to analyze seven component bodies of oil dissolved gas: hydrogen, oxygen, carbon monoxide, methane, ethylene, ethane and acetylene. A complete machine system adopts a double- chromatographic-column separation system, utilizes a ten-way valve to switch over, and uses a non-split sampling manner; all samples enter a first chromatographic column at a time, after the hydrogen, the oxygen, the carbon monoxide and the methane come out, the ten-way valve is switched to a second chromatographic column, and the ethylene, the ethane and the acetylene continuously appear. The components in samples flow into a photoacoustic cell detection module after flowing out, and are detected by adopting a photoacoustic spectrometry technology. According to the instrument, samples are fed at a time, the seven component dissolved gases are analyzed, each gas is firstly separated and then detected, the cross sensitivity is avoided, the sensitivity is high, and the photoacoustic spectrometry and chromatography spectrometer has excellent sensitivity on each component key gas, especially the acetylene, and is suitable to be popularized and used in smart power grid projects.

Description

[0001] 1. Technical field [0002] The invention belongs to the technical field of power grids, and relates to a novel photoacoustic spectrum and chromatographic analyzer and a detection method, which are mainly used in the analysis of dissolved gas in insulating oil of large-scale oil-filled electrical equipment. [0003] 2. Background technology [0004] At present, the gas chromatographic analysis of insulating oil of large oil-filled electrical equipment inside substations, power plants, etc. generally needs to be carried out in special laboratories. And then analyzed by laboratory off-line chromatograph. The off-line chromatograph generally adopts dual-detector gas chromatography technology (hydrogen flame ionization detector and thermal conductivity detector), and uses a split injection method. There are some problems with the detection techniques described above. First of all, the oil sample needs to be transported during the whole process, and the analysis period is r...

AI Technical Summary

Problems solved by technology

First of all, the oil sample needs to be transported during the whole process, and the analysis period is relatively long, during which gas may escape, especially for H 2 Low-molecular-weight gases, such as low-molecular-weight gases, are easily precipitated from the oil, resulting in inaccurate measurement results

Second, the aforementioned dual-detector technology off-line chromatograph requires N 2 , H 2 , air three kinds of gas sources, the hydrogen flame ionization detector needs to be ignited before it can be used, there are safety hazards in the application of the substation site, and it is not suitable for the application of online monitoring

Moreover, the parallel split sampling method needs to be manually operated, and it is difficult to ensure the same split ratio during each operation, which will affect the accuracy of the analysis results.

In addition, gas chromatographs using hydrogen flame ionization detectors and thermal conductivity detectors are bulky, cumbersome, troublesome to maintain, and difficult to miniaturize and go online

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