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Keywords

environmental‑friendly insulating medium;power frequency breakdown discharge;decomposition product;density functional theory;decomposition mechanism

Abstract

The quantitative analysis and formation mechanism of the decomposition products of (CF3)2CFCN/CO2 mixture under breakdown discharge have some defects. Therefore, the decomposition products of (CF3)2CFCN/CO2 gas mixture after multiple AC breakdown discharge are quantitatively detected by gas chromatography-mass spectrometry, and the difference of product contents are analyzed in this paper. In addition, based on density functional theory, the decomposition and product formation path of (CF3)2CFCN/CO2 mixed gas and the stability of (CF3)2CFCN are analyzed from microscopic view. The enthalpy change and reaction rate of each reaction at different temperatures are calculated. The research shown that the decomposition products of (CF3)2CFCN/CO2 mixed gas are mainly CO, CF4, C2F6, C3F8, CF3CF2CF2CF3, C2F4, C3F6, CF3C≡CCF3, CF2=CFCF2CF3, CF3CN, C2F5CN, C2N2 and HF, and the decomposition products are mainly small molecular compounds. The volume fractions of saturated and unsaturated fluorocarbons trend to decrease with the increasing carbon atoms number, and the total volume fractions of saturated fluorocarbons are relatively larger. The increasing temperature accelerate the decomposition of (CF3)2CFCN to generate CF3 radicals. The relevant results reveal the decomposition characteristics of (CF3)2CFCN/CO2 mixed gas under AC breakdown discharge, which provides a reference for the application and maintenance of mixed gas.

DOI

10.19781/j.issn.1673-9140.2023.02.017

First Page

150

Last Page

160

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