| Indirect air-cooled units has been rapid development in the China's "Three North" area,because of its good water-saving performance.The water consumption of air-cooled units only accounts for 15%-25% proportion of that in the wet cooling units,hence,it becomes an effective way to solve the contradiction of coal rich and water shortage.Air cooling tower is an important component of indirect air-cooled unit,its performance directly affects the air-cooled unit safety and economic operation.In this paper,the cooling towers of Heller-type indirect air-cooling units are studied and the three-dimensional model of the cooling tower is established by Gambit.This paper using porous media model,RNG k-? turbulence model has conducted numerical simulation research on operation of air cooling tower in Heller-type indirect air cooling system of a power plant,by means of Fluent software.The air flow rate and temperature distribution in the air-cooled tower and the ventilation rate of the air-cooling tower are obtained under different ambient wind speed and load conditions.The existence of cross wind will reduce the ventilation capacity of the air cooling tower and reduce the cooling efficiency of the cooling tower.The deflector can improve the flow of air-cooled tower,and the flow heat transfer of the air cooling towers around the installation of the deflector is analyzed.The number and the installation angle of the deflector are optimized.The results show that when the number of deflector is 24 and the installation angle is 45°,the ventilation capacity of the air cooling tower increases the most.When there is a cross wind,the ventilation of air cooling tower slows down.The installation of the deflector reduces the influence of the ambient air on the cooling tower. |
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