Next Article in Journal
A Process Study of Lactic Acid Production from Phragmites australis Straw by a Thermophilic Bacillus coagulans Strain under Non-Sterilized Conditions
Next Article in Special Issue
A Data-Driven Reaction Network for the Fluid Catalytic Cracking of Waste Feeds
Previous Article in Journal
Characteristics and Treatment Methods of Medical Waste Incinerator Fly Ash: A Review
 
 
Article

The Influence of O2 on Decomposition Characteristics of c-C4F8/N2 Environmental Friendly Insulating Gas

1
School of Electrical Engineering, Wuhan University, BaYi Street No. 299, Wuhan 430072, China
2
LAPLACE (Laboratoire Plasma et Conversion d’Energie), UPS, INPT, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse CEDEX 9, France
*
Authors to whom correspondence should be addressed.
Processes 2018, 6(10), 174; https://doi.org/10.3390/pr6100174
Received: 5 August 2018 / Revised: 9 September 2018 / Accepted: 19 September 2018 / Published: 29 September 2018
(This article belongs to the Special Issue Modeling, Simulation and Control of Chemical Processes)
The c-C4F8 gas is considered to have great potential as a gaseous medium for gas-insulated equipment, due to its good insulation properties and its relatively low greenhouse gas potential (GWP) relative to SF6. However, the decomposition is an important indicator of its use in equipment. In this paper, the decomposition characteristics of c-C4F8 and the influence by oxygen have been explored through experiments and theoretical calculations. Firstly, the breakdown test of mixed gas was carried out and the precipitated elements of the electrodes and breakdown products of gas mixture were analyzed by X-ray photoelectron spectroscopy (XPS) and gas chromatography mass spectrometry (GC-MS). At the same time, the differences in decomposition products have also been studied when a small amount of O2 was present. The path and mechanism of c-C4F8 decomposition is then discussed, based on density functional theory (DFT). The results show that the black powdery substance descends on the electrode surface after the breakdown of the mixture of c-C4F8/N2 gas containing O2, and its main constituent elements are C, O and F. O2 can promote the decomposition of c-C4F8. The mixture with O2 produced a large number of additional toxic and corrosive COF2 in addition to generating more CF4, C2F4, C2F6, C3F6 and C3F8. The GWP values of the products are lower than SF6. Comprehensive insulation properties and decomposition characteristics, c-C4F8 should not be mixed with dry air for use, and the oxygen content should be strictly controlled in c-C4F8 mixed gas. View Full-Text
Keywords: SF6 alternative gas; c-C4F8/N2 gas mixture; breakdown characteristics; decomposed component; greenhouse effect SF6 alternative gas; c-C4F8/N2 gas mixture; breakdown characteristics; decomposed component; greenhouse effect
Show Figures

Graphical abstract

MDPI and ACS Style

Xiao, S.; Tian, S.; Zhang, X.; Cressault, Y.; Tang, J.; Deng, Z.; Li, Y. The Influence of O2 on Decomposition Characteristics of c-C4F8/N2 Environmental Friendly Insulating Gas. Processes 2018, 6, 174. https://doi.org/10.3390/pr6100174

AMA Style

Xiao S, Tian S, Zhang X, Cressault Y, Tang J, Deng Z, Li Y. The Influence of O2 on Decomposition Characteristics of c-C4F8/N2 Environmental Friendly Insulating Gas. Processes. 2018; 6(10):174. https://doi.org/10.3390/pr6100174

Chicago/Turabian Style

Xiao, Song, Shuangshuang Tian, Xiaoxing Zhang, Yann Cressault, Ju Tang, Zaitao Deng, and Yi Li. 2018. "The Influence of O2 on Decomposition Characteristics of c-C4F8/N2 Environmental Friendly Insulating Gas" Processes 6, no. 10: 174. https://doi.org/10.3390/pr6100174

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop