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In order to further explore the application potential of C4F7N/CO2 mixed gas in high-voltage electrical equipment, a preparation system for C4F7N/CO2 mixed gas was established and mixed gas with different volume fraction of C4F7N was prepared by partial pressure method. A gas chromatograph-hydrogen flame ionization detector (GC-FID) detection method was established, in view of the difficulty in controlling the testing quality during the preparation of C4F7N/CO2 mixture system, the thermal driven diffusion simulation experiments of different C4F7N/CO2 mixed gas was carried out based on fluid mechanics and finite element analysis. The results show that when the volume fraction of C4F7N is 2%, 5%, and 10%, the diffusion equilibrium time of C4F7N/CO2 concentration is 4 775 s, 6 600 s, and 8 800 s, respectively; the concentration diffusion equilibrium time of C4F7N gas is 94 min, 122 min, and 158 min, respectively. The three C4F7N/CO2 mixed gas can achieve good quality control effect in the quality detection and application after preparing for 100 min, 125 min, and 160 min, respectively.
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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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