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Degassing heat treatment is the longest process in the production of cross-linked polyethylene (XLPE) cables, and reducing degassing time is an important way to improve cable production efficiency. Focused on the migration of residual by-products in XLPE insulating materials for high-voltage cables, we established a diffusion model of cross-linked by-products driven by concentration gradient. The concentration of by-products in the insulation of a 320 kV DC cable after degassing was measured and compared with the simulation results, and the effects of temperature and initial concentration of by-products on the degassing process were investigated. The results show that the simulation and measured results of the concentration distributions of methane and acetophenone in the 320 kV DC cable after degassing are essentially consistent, verifying the correctness of the model. Higher temperatures can accelerate the degassing process of by-products. Within the temperature range of 65-75℃, for every 5℃ increase in temperature, the degassing time for methane is shorten by approximately 30%, and the degassing time for acetophenone is shorten by approximately 72 h. Reducing the initial by-product concentration can also shorten the cable degassing time. It is an important way to reasonably regulate the initial concentration of by-products and degassing temperature for optimizing the cable degassing process and improving enterprise efficiency.
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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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