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The complex and variable meteorological conditions have a significant impact on operational characteristics of indirect air cooling systems. To enhance the cooling performance of indirect air cooling systems, an optimized regulation strategy for circulating water in indirect air cooling systems is proposed. By taking the indirect air cooling unit in a power plant as an object and considering the influence of surrounding buildings, the optimization distribution of circulating water flow in each sector of the air cooling heat exchanger is numerically studied. Firstly, a one-dimensional thermodynamic model of the indirect air cooling unit and a three-dimensional numerical model of the indirect air cooling tower are established and coupled for numerical calculation. Secondly, the influence of different meteorological conditions on the operating back pressure of the unit and the flow and heat transfer characteristics of the cooling tower is analyzed. As a result, the economic back pressure variation law of the unit under specific environmental meteorological conditions is obtained. Finally, constrained by the economic back pressure of the unit, the circulating water flow rate of each sector of the indirect air cooling heat exchanger is optimized according to the so-called heat load matching principle, which enhances the flow and heat transfer performance of the indirect air cooling system. The research results indicate that as the ambient temperature increases, the economic back pressure will also increase accordingly. When the ambient wind speed increases, the economic back pressure of the unit also increases. By optimizing the distribution of circulating water flow in each sector of the indirect air cooling heat exchanger, the uniformity of the outlet water temperature in each sector can be improved, the average outlet water temperature of the intercooled tower can be reduced, the total circulating water flow can be decreased, and the operating economy of the unit can be improved. This study can provide theoretical basis and reference for optimizing the operation of indirect air cooling units.
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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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