Influence of Oxygen on the Thermal Decomposition Properties of C4F7N-N2-O2 as an Eco-Friendly Gas Insulating Medium
Influence of Oxygen on the Thermal Decomposition Properties of C4F7N-N2-O2 as an Eco-Friendly Gas Insulating Medium
复制标题
氧气对环保气体绝缘介质C4F7N-N2-O2热分解性能的影响
DOI：
10.1021/acsomega.9b02423
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发表时间：
2019
期刊：
影响因子：
4.1
通讯作者：
Tang Ju
中科院分区：
文献类型：
--
作者：
Zhang Xiaoxing;Li Yi;Shao Xianjun;Xie Cheng;Chen Dachang;Tian Shuangshuang;Xiao Song;Tang Ju
C4 F7 N（氟化腈）混合气体被认为是气体绝缘设备中最有潜力的SF6替代气体。本文研究了C_4F_7 N-N_2-O_2混合气体的热稳定性和热分解特性。分析了氧含量和温度对副产物生成的影响机理。结果表明，C4 F7 N-N2-O2混合气体的热分解主要产生CO、C3 F6、C3 F8、CF 3CN、（CN）2和COF 2。氧气的加入可以促进C_4F_7N的分解。随着氧含量的增加，C3 F6和（CN）2的含量减少，而CF 4、CO、C3 F8和COF 2的产率增加。C4 F7 N-N2-O2气体混合物在低于425 °C的温度下的热分解是由C4 F7 N与金属加热元件之间的相互作用引起的，而键断裂反应在较高的温度下发生。从工程应用角度考虑，在6%C4F7N-94%N2混合气体中加入的氧气不宜超过6%，以避免氧气对C4 F7 N热稳定性的负面影响。
The C4F7N (fluorinated nitrile) gas mixture has been recognized as the most potential substitute gas to SF6used in gas-insulated equipment. In this paper, we explored the thermal stability and decomposition properties of the C4F7N–N2–O2gas mixture. The influence mechanism of oxygen content and temperature on the byproduct generation was obtained and analyzed. It was found that thermal decomposition of the C4F7N–N2–O2gas mixture mainly produces CO, C3F6, C3F8, CF3CN, (CN)2, and COF2. The addition of oxygen could accelerate the decomposition of C4F7N. The content of C3F6and (CN)2decreases, while the yield of CF4, CO, C3F8, and COF2increases with the oxygen content. Thermal decomposition of the C4F7N–N2–O2gas mixture at temperatures lower than 425 °C results from the interaction between C4F7N and the metal heating element, while the bond cleavage reactions occur at higher temperature. As for engineering application, the oxygen added in the 6%C4F7N–94%N2gas mixture should not exceed 6% to avoid the negative effect of oxygen on the thermal stability of C4F7N.