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C4F7N/CO2/O2 gas mixture is one of the promising environmentally friendly gas insulation medium to replace SF6 currently. At present, there is relatively little research on the influence mechanism of the additional buffer gas O2 and its content variation on the decomposition characteristics of C4F7N/CO2/O2. In this paper, on the basis of reactive molecular dynamics (ReaxFF-MD) method, a reaction system model of C4F7N/CO2/O2 gas mixture was constructed to simulate the thermal decomposition process of C4F7N gas mixture at different O2 content and temperature, and the main reaction pathways, product composition and generation rate were analyzed. The results show that the C4F7N/CO2/O2 gas mixture mainly generates CF3, CF2, CF, F, C2F5, and CN after thermal decomposition, among them, the generation amount of CF2 and CF is the highest, followed by CF3 and F. Although the addition of O2 to C4F7N/CO2 gas mixture will decrease the initial decomposition time of C4F7N, it can effectively reduce the decomposition amount of C4F7N and the generation amount of most particles. Especially when the volume fraction of O2 is 6%, the decomposition amount of C4F7N is the least. When the volume fraction of O2 is 0%-4%, the reaction rate of the main decomposition reaction in the reaction system decreases, while the reaction rate increases when the volume fraction of O2 is greater than 8%. When the simulation temperature is higher than 2 600 K, the initial decomposition time of C4F7N is significantly shortened and the generation rate of decomposed particles is accelerated. The research conclusions provide a theoretical basis for the application ratio optimization of C4F7N/CO2/O2 and the operation maintenance and diagnosis of its equipment.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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