五种吸附剂与C4F7N气体及CF3SO2F气体的相容性试验研究

doi:10.19595/j.cnki.1000-6753.tces.L10103

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Abstract

SF₆ is an advantageous insulation gas that is widely applied in electrical equipment all over the world. However, the high GWP (Global Warming Potential) it possesses prevents it from continuous application due to environment-friendly targets. In this circumstance, a variety of environment-friendly insulation gases have entered the field of view of researchers. C₄F₇N (Perfluoroisobutyronitrile) and CF₃SO₂F (trifluoromethylsulfonyl fluoride) are two novel environment-friendly gases replacing SF₆. Researchers have conducted a bunch of studies to test the dielectric properties and other properties of two gases by different methods. To promote the use of environment-friendly gases in industrial applications, it is necessary to study the compatibility between environment-friendly gases and common adsorbents in electrical equipment. Compatibility means that a kind of material will not have physical changes or chemical changes if contacted by other kinds of material. Recent research indicated that activated alumina is incompatible with C₄F₇N while there is little research on the compatibility of adsorbents with CF₃SO₂F. To find out the compatibility between the adsorbents and CF₃SO₂F and to verify the test methods used in this paper, a series of tests were performed.
According to the gas application scheme that the researchers have introduced, 20%C₄F₇N/80%CO₂ mixed gas under 0.6 MPa and 40%CF₃SO₂F/N₂ mixed gas under 0.4 MPa were used for the compatibility test. The mixed gas and the adsorbents were put into gas containers made of stainless steel at 25℃. The GC-MS tests and GC tests aimed to analyze the collected gas after the tests were performed 7 days later. The mass of the adsorbents was measured by precision balances before and after the tests to find out how much weight the adsorbent increased through the adsorption process. The gas and adsorbents test results were compared to find out if the target environment-friendly gas was adsorbed.
The adsorption effect of five commonly used adsorbents (3A molecular sieve, 4A molecular sieve, 5A molecular sieve, 13X molecular sieve, and activated alumina) on C₄F₇N/CO₂ and CF₃SO₂F/N₂ gases was experimentally studied. Firstly, the GC-MS (Gas Chromatography-Mass Spectrometry) results show that there is no extra gas produced in both tests for C₄F₇N and CF₃SO₂F which indicates that there are no chemical changes during a 7-day test. By detecting the proportion and composition of mixed gases before and after the test through GC (Gas Chromatography) test, it is found that activated alumina can obviously reduce the proportion of C₄F₇N by 1.88% which can be converted to 0.257 g while no similar result was observed for CF₃SO₂F. Other adsorbents will not reduce the ratio of the two gases. The increased mass of the adsorbents was calculated and the increased mass of the activated alumina adsorbent is 0.282 g which is approximately equal to the decreased mass of C₄F₇N considering the errors in the test. Because GC-MS test result reveals that no chemical change between C₄F₇N and activated alumina during the test, the adsorption effect is considered physical adsorption. The analysis shows that the CN group of C₄F₇N molecule has a weak interaction with activated alumina, which leads to its adsorption by activated alumina. Therefore, activated alumina is not suitable for use as an adsorbent in C₄F₇N gas-insulated equipment, and the five adsorbents involved are all compatible with CF₃SO₂F.

Key words： Adsorbent C₄F₇N CF₃SO₂F SF₆ alternative gases compatibility

Received: 10 January 2023

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	Lv Yichen
	Zheng Yu
	Zhu Taiyun
	Zhou Wenjun
	Li Han

Cite this article:

Lv Yichen,Zheng Yu,Zhu Taiyun等. Experimental Study on Compatibility Between C₄F₇N and CF₃SO₂F Gases and Five Adsorbents[J]. Transactions of China Electrotechnical Society, 0, (): 152-152.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L10103 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/152

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