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首页 > 过刊浏览>2023年第38卷第2期 >150-160. DOI:10.19781/j.issn.1673-9140.2023.02.017
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工频击穿放电下(CF3)2CFCN/CO2混合气体分解特性分析
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作者:
作者单位:

(1.上海电力大学电气工程学院，上海 200090;2.云南电网有限责任公司电力科学研究院，云南 昆明 650217;3.国网上海市电力公司松江供电公司，上海 201600)

通讯作者:

陈 炯（1977—），男，博士，副教授，主要从事高压试验技术与电气设备绝缘诊断技术研究；E?mail:Chenjiong770516@163.com

中图分类号:

TM855

基金项目:

中国南方电网公司科技项目(YNKJXM20220051)；云南省基础研究项目(202001AT070006)；国家自然科学基金（52177185）


Decomposition characteristics of (CF3)2CFCN/CO2 mixed gases under power frequency breakdown discharge
Author:
Affiliation:

(1.College of Electric Power Engineering, Shanghai University of Electric Power, Shanghai 200090, China; 2.Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650217, China; 3.Songjiang Power Supply Company,State Grid Shanghai Municipal Electric Power Company, Shanghai 201600, China)

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    摘要:

    针对击穿放电下(CF3)2CFCN/CO2混合气体分解产物的定量分析和形成机理尚不完善这一问题，利用气相色谱质谱联用仪对工频击穿放电后(CF3)2CFCN/CO2混合气体的分解产物进行定量检测，横向比较分析产物含量的差异性。此外，基于密度泛函理论从微观层面对C4F7N的稳定性以及(CF3)2CFCN/CO2混合气体分解及产物形成路径展开分析，并计算不同温度下各反应的焓变及反应速率常速。研究表明，(CF3)2CFCN/CO2混合气体的分解产物主要为CO、CF4、C2F6、C3F8、CF3CF2CF2CF3、C2F4、C3F6、CF3C≡CCF3、CF2=CFCF2CF3、CF3CN、C2F5CN、C2N2和HF，且分解产物主要是小分子化合物，其中饱和氟碳化合物和不饱和氟碳化合物的体积分数都随着碳原子数的增加呈现出下降趋势，并且饱和氟碳化合物的体积分数总量相对较大；温度升高(CF3)2CFCN分解产生CF3自由基变得更加容易，且温度升高也会加速(CF3)2CFCN的分解。相关结果揭示了工频击穿放电下(CF3)2CFCN/CO2混合气体的分解特性，为混合气体的应用和维护提供参考。

    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.

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胡宗杰,陈 炯,邓云坤,等.工频击穿放电下(CF3)2CFCN/CO2混合气体分解特性分析[J].电力科学与技术学报,2023,38(2):150-160.
HU Zongjie, CHEN Jiong, DENG Yunkun, et al. Decomposition characteristics of (CF3)2CFCN/CO2 mixed gases under power frequency breakdown discharge[J]. Journal of Electric Power Science and Technology,2023,38(2):150-160.

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