SF<sub>6</sub>混合气体的液化特性研究

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Abstract The liquefaction temperature of SF₆/N₂, SF₆/CO₂ and SF₆/CF₄ mixed gases, as potential substitute gases for SF₆, is an important basis for people to evaluate the feasibility of substitution and a parameter that must be considered in engineering practice. Especially in the cold region, SF₆ insulation equipment often faces the problem of loss of original insulation characteristics due to gas liquefaction. Studies have found that by incorporating difficult liquefied gas composition, can improve the critical value of mixed gas liquefaction temperature, based on the calculation target of mixed gas Antoine vapor pressure equation, and combining the fundamental laws of vapor liquid equilibrium, calculated three goals mixed gas under the conditions of different mix proportion coefficient k, saturated vapor pressure value of the mixed gas and the mixed gas liquefaction temperature changes in the relationship; The relationship between the liquefaction temperature of the mixed gas and the mixing ratio coefficient k was calculated and analyzed when the saturated vapor pressure of the mixed gas was 0.3MPa, 0.5MPa and 0.7MPa respectively. By comparing the liquefaction temperature data of the three target mixed gases, the superiority order of the three target mixed gases in solving the liquefaction temperature problem is obtained.

Key words： liquefaction temperature SF₆ mixed gas saturation vapor pressure gas-liquid equilibrium

Received: 20 April 2020

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	Articles by authors
	Li Hongpeng
	Feng Chiyao
	Li Baofeng
	Liao Zhao
	Liu Tao

Cite this article:

Li Hongpeng,Feng Chiyao,Li Baofeng等. The study on liquefaction characteristics of SF₆ mixed gas[J]. Electrical Engineering, 2020, 21(11): 57-60.

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http://dqjs.cesmedia.cn/EN/Y2020/V21/I11/57

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