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Under low-temperature conditions in winter, the fin-tube bundles of air-cooled radiators are prone to freezing. Exploring the variation patterns of the critical anti-freezing ambient temperature and critical anti-freezing circulating water flow rate of the indirect air-cooling system at different wind speeds and directions is of great guiding significance for ensuring the safe and stable operation of power plants. Taking a 2×350 MW indirect air-cooled unit as the research object, this study adopts the numerical simulation method, combining with the louver opening adjustment strategy, to investigate the critical anti-freezing characteristics of the indirect air-cooling system under different operating conditions. Through the analysis and calculation of the variation patterns of the flow and heat transfer performance of the indirect air-cooling system under different ambient meteorological conditions in winter, the variation laws of the critical anti-freezing ambient temperature and critical anti-freezing flow rate of the indirect air-cooling system at different wind speeds, wind directions and louver openings are revealed. The results show that an increase in ambient wind speed leads to a decrease in the critical anti-freezing ambient temperature and an increase in the critical anti-freezing flow rate. Reducing the louver opening can lower the critical anti-freezing ambient temperature, while the critical anti-freezing flow rate shows a trend of decreasing at first and then increasing. However, under the condition of high wind speed in the 270° wind direction, the critical anti-freezing flow rate decreases continuously with the reduction of louver opening. The research conclusions can provide operational guidance for the safe and stable operation of indirect air-cooled units in low-temperature winter environments.
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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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