高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (11): 20220424.doi: 10.7503/cjcu20220424

• 物理化学 • 上一篇    下一篇

三氟甲基磺酰氟绝缘介质理化特性的分子动力学模拟

张咪1, 田亚锋1, 高克利2, 侯华1, 王宝山1()   

  1. 1.武汉大学化学与分子科学学院, 武汉 430072
    2.中国电力科学研究院有限公司, 北京 100192
  • 收稿日期:2022-06-15 出版日期:2022-11-10 发布日期:2022-08-15
  • 通讯作者: 王宝山 E-mail:baoshan@whu.edu.cn
  • 基金资助:
    国家重点研发计划项目(2021YFB2401400)

Molecular Dynamics Simulation of the Physicochemical Properties of Trifluoromethanesulfonyl Fluoride Dielectrics

ZHANG Mi1, TIAN Yafeng1, GAO Keli2, HOU Hua1, WANG Baoshan1()   

  1. 1.College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,China
    2.China Electric Power Research Institute,Beijing 100192,China
  • Received:2022-06-15 Online:2022-11-10 Published:2022-08-15
  • Contact: WANG Baoshan E-mail:baoshan@whu.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2021YFB2401400)

摘要:

采用分子动力学模拟方法, 研究了新型绝缘介质三氟甲基磺酰氟(CF3SO2F)的理化特性, 为高压电气设备应用CF3SO2F替代SF6气体提供了理论依据. 基于量子化学计算的分子结构、 内转动、 偶极矩和振动频率等优化设计了mPCFF力场模型, 计算了243~323 K温度范围内CF3SO2F的各种气-液相平衡性质(饱和蒸汽压、 密度、 热容、 蒸发焓和临界参数等)与关键输运特性(扩散系数、 介电常数、 黏度和热导率等)基础参数, 并考察了CF3SO2F与N2或CO2形成混合气体的理化特性. 通过对比SF6以及C4/CO2混合环保绝缘气体, 针对混合比、 液化温度、 扩散和热导等因素提出了CF3SO2F的电气设备应用建议.

关键词: 六氟化硫替代气体, 三氟甲基磺酰氟, 理化特性, 力场, 分子模拟

Abstract:

Physicochemical properties of trifluoromethanesulonyl fluoride(CF3SO2F) dielectric medium, which is a promising eco-friendly insulation gas to replace SF6 for the high-voltage electric applications, were calculated using molecular dynamics simulations. An optimized mPCFF force field was proposed and validated on the basis of the theoretically predicted molecular structures, internal rotation, dipole moments, and vibrational frequencies, which were in good agreement with the experimental and quantum chemical data. The physical properties of CF3SO2F in the phase envelope including vapor pressures, densities, heat capacities, enthalpies of vaporization, critical properties, together with the key transportation parameters including self-diffuse coefficients, dielectric constants, shear viscosities, and thermal conductivities, were examined systematically for the first time in the temperature range 243—323 K. In addition, the gas mixtures of CF3SO2F with N2 or CO2 buffer gas were investigated to compare with the electrical performance of SF6 and C4/CO2. A few critical suggestions on the use of CF3SO2F were proposed in terms of mixing ratio, liquefaction temperature, self-diffuse, and thermal conductivity for the purpose of realistic electrical applications.

Key words: Replacement gas for SF6, Trifluoromethanesulfonyl fluoride, Physicochemical property, Force field, Molecular dynamics simulation

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