Helium ion chromatographic analysis method for SF6 (sulfur hexafluoride) decomposition product

Abstract

The invention discloses a helium ion chromatographic analysis method for a SF6 (sulfur hexafluoride) decomposition product. The method comprises the following steps: separating components of a sample by adopting a combination of four chromatographic columns, comprising a silica gel column, a first Porapak Q column, a second Porapak Q column and a Gaspro capillary column; performing component cutting separation and control by adopting for valves comprising a first valve, a second valve, a third valve and a fourth valve, and respectively analyzing and testing the separated sample by adopting a first PDD detector and a second PDD detector. According to the analysis method, the SF6 decomposition products, such as H2, O2, N2, CO, CH4, CO2, COS, H2S, SOF2, CS2 and other compounds, which cannot be accurately detected by a traditional analysis method can be simultaneously and accurately detected, and the SF6 decomposition products are comprehensively and accurately analyzed, so that the internal operating conditions of SF6 gas insulated equipment are accurately judged, and the safety operation of electrical equipment is guaranteed.

Description

technical field [0001] The invention relates to the field of analysis and detection, in particular to a SF 6 Helium ion chromatographic analysis of decomposition products. Background technique [0002] Sulfur hexafluoride (SF 6 ) is a colorless, odorless, non-toxic, non-flammable and chemically stable synthetic gas at normal temperature and pressure. SF 6 The molecular structure of monosulfide and polyfluorine is extremely strong electronegativity, endowing it with excellent electrical insulation and arc extinguishing properties. Currently, SF 6 As a new generation of insulating medium, it is widely used in high-voltage and ultra-high-voltage electrical equipment. Refill SF 6 The electrical equipment occupies a small area, the operating noise is small, and there is no risk of fire, which greatly improves the safety and reliability of electrical equipment operation. [0003] SF 6 Under the action of overheating, electric arc, electric spark and corona discharge, the g...

AI Technical Summary

Problems solved by technology

However, relying on single-column separation cannot effectively analyze H 2 , O 2 , N 2 , CO, CH 4 , CO 2 , COS, H 2 S, SOF 2 , CS 2 and other compounds, and these compounds are very important for judging the internal operating status of electrical equipment

The use of TCD-FPD series detectors also has disadvantages. TCD has low sensitivity and high detection limit, and cannot be used to detect low-level decomposition products; because the FPD detector is not a linear detector, it is easy to cause large errors in quantification. , quantitatively inaccurate

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