Method and device for testing hydrolyzable fluorides in sulfur hexafluoride gas

Abstract

The invention provides a method and device for testing hydrolyzable fluorides in sulfur hexafluoride gases. The method comprises the following steps: 1) sufficiently mixing an SF6 gas with a NaOH solution in a jet device; 2) feeding a gas-liquid mixed liquid into an absorption tank, performing gas-liquid circulation, feeding into the absorption tank through the jet device, and repeating the operation till a fluorinion electrode measurement value is stable, wherein the potential of a fluorinion electrode is V1 at the moment; 3) repeating steps 1) and 2) to another SF6 gas, wherein the potentialof the fluorinion electrode is V2 at the moment; 4) drawing a fluorinion working curve; 5) according to a standard working curve equation, testing the concentration of hydrolysable fluorides. According to the device, the input end of the jet device is communicated with a gas inlet pipeline and a liquid circulation pump respectively, the output end of the jet device is communicated with an absorption tank, the inlet of a six-way valve is connected with an injection pump, and the input end of the liquid circulation pump is communicated with the bottom of the absorption tank through an electromagnetic valve; after a buffer tank is serially connected with the gas circulation pump, a gas inlet and a gas outlet are correspondingly communicated with an exhaust pipeline and the gas inlet pipeline, and accurate testing and sufficient absorption upon the hydrolyzable fluorides are achieved.

Description

technical field [0001] The invention provides a method and device for measuring hydrolyzable fluoride in sulfur hexafluoride gas, belonging to the technical field of power system detection. technical background [0002] SF 6 As an excellent insulating medium, gas has been widely used in high-voltage electrical equipment. However, impurities such as hydrolyzable fluoride are easily mixed in the production process. Therefore, "Industrial Sulfur Hexafluoride" (GB / T 12022-2014) has a The requirements for the content of hydrolyzable fluoride in sulfur hexafluoride gas are put forward, and the "Determination Method for Hydrolyzable Fluoride Content in Sulfur Hexafluoride Gas" (DL / T918-2005) specifies the content of hydrolyzable fluoride in sulfur hexafluoride gas in detail The measurement method is the oscillation absorption method. The specific process requires manual oscillation for 1 minute every 5 minutes within 1 hour. In this method, the operator's oscillation strength dete...

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Problems solved by technology

[0002] SF 6 As an excellent insulating medium, gas has been widely used in high-voltage electrical equipment. However, impurities such as hydrolyzable fluoride are easily mixed in the production process. Therefore, "Industrial Sulfur Hexafluoride" (GB / T 12022-2014) has a The requirements for the content of hydrolyzable fluoride in sulfur hexafluoride gas are put forward, and the "Determination Method for Hydrolyzable Fluoride Content in Sulfur Hexafluoride Gas" (DL / T918-2005) specifies the content of hydrolyzable fluoride in sulfur hexafluoride gas in detail The measurement method is the oscillation absorption method. The specific process requires manual oscillation for 1 minute every 5 minutes within 1 hour. In this method, the operator's oscillation strength determines the absorption effect, which leads to laborious absorption process, and it is not easy to absorb completely. It cannot be determined in real time, resulting in large deviations in measurement results; due to some SF 6 The content of hydrolyzable fluoride in the gas is extremely low, which is basically close to the lower detection limit of the fluoride ion sensor. At this time, the measurement deviation is relatively large when directly measured

In addition, the patent application number is CN201510189593.5 "Direct Quantitative Calibration Method for the Measurement of Hydrolyzable Fluoride in Sulfur Hexafluoride Gas", using SOF 2 As a standard gas, it is used to calibrate the fluoride ion electrode, but the gas is highly toxic and reacts slowly with water. Therefore, the efficiency of preparing a standard fluoride ion solution with this gas is extremely low, and the reaction is incomplete, so it cannot be used as a standard substance for the fluoride ion sensor. check

[0003] The determination of fluoride ion content by ion chromatography has the advantages of high measurement accuracy and good reproducibility, but when this method is tested, it is necessary to prepare gradient concentration standard solutions of each component, and the ion chromatograph itself has a large volume. Therefore, the ion chromatograph The method cannot be used for on-site detection

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