基于Boltzmann方程的CF3I二元混合气体替代SF6的可行性研究

Feasibility Study of Replacing SF6 with CF3I Binary Mixed Gas Based on Boltzmann Equation

SF6气体虽然绝缘性能优越但是极易液化,且是一种温室效应值很高的气体。CF3I气体是极具潜力的SF6替代气体之一,通过计算求解CF3I/N2、CF3I/CO2二元混合气体在0.1 MPa、300 K下的两项近似Boltzmann方程,得到不同二元混合气体的电子能量分布函数(EEDF)和临界折合击穿场强(E/N)cr,并通过计算混合气体的液化温度、协同效应系数来表征混合气体的混合比例与协同能力。结果表明:从物化特性分析,30%CF3I/70%N2二元混合气体最有可能替代SF6,而CF3I/CO2二元混合气体只适用于在约化电场强度小于300 Td且平均电子能量和电离度较低的情况下替代SF6;通过与其他文献的数据进行对比,验证了本研究中计算方法和数据的有效性。

Although SF6 gas has excellent insulating properties,it is easy to liquefy and has high greenhouse effect value.CF3I gas is one of the most potential alternative gas to SF6.Two approximate Boltzmann equations of CF3I/N2 and CF3I/CO2 binary mixed gas at 0.1 MPa and 300 K were calculated,and the electron energy distribution function(EEDF)and critical fold breakdown strength(E/N)crwere obtained.The liquefaction temperature and synergistic effect coefficient of the mixed gases were calculated to characterize their mixing ratio and synergy ability.The results show that the 30%CF3I/70%N2 binary mixed gas is most likely to replace SF6 from the physicochemical properties,and the CF3I/CO2 binary mixed gas could replace SF6 only when the reduced electric field strength is less than 300 Td and the average electron energy and ionization degree are low.The validity of calculation method and data in this paper is verified by comparing with the data of other literatures.