Numerical Study On Heat Transfer Performance And Improvement Scheme Of Indirect Dry Cooling Tower

In today’s society,there is a shortage of water resources.Therefore,water conservation and water utilization improvement have become major development strategies for sustainable development in our country.The construction of traditional wet and cold aircrews needs to consume a large amount of water resources.Air-cooled units with air cooling technology have significant water-saving effect.Therefore,indirect dry cooling towers are widely used in water-scarce places.In this paper,600 MWindirect dry cooling tower as the research object,establish the geometric and mathematical model of the indirect dry cooling tower.The mathematical model was established by using continuity equation,momentum equation,energy equation and k-? equation.By dividing the grid and setting the boundary conditions,the heat exchanger model of the intercooler was calculated and the distribution of the flow field and the temperature field under different wind speeds was obtained.The heat transfer performance of the intercooler was further analyzed.At the same time,compared with the heat transfer performance under design condition,the model built meets the actual requirements of the project.When the wind speed is high,regardless of whether the indirect dry cooling tower around the building,the heat transfer performance decreased.In order to improve the heat transfer performance of the indirect dry cooling tower,some different improvement measures are put forward.The results show that when there is no ambient wind,there is no influence on the heat transfer performance of buildings around the indirect dry cooling tower;When there is wind,regardless of whether the indirect dry cooling tower around the building,the heat transfer performance of indirect dry cooling tower wind velocity increases first decreases and then increases,but the minimum value of two kinds is different.When there is no building cold around the tower,when the wind speed is small,the heat transfer effect is good,when the wind speed is larger,the effect of heat transfer is worse.When the ambient wind speed is high,buildings around the indirect dry cooling tower have a significant effect on improving the heat transfer performance.At this time,no matter whether the indirect dry cooling tower around the building,by improving the distribution of air flow and ventilation of the indirect dry cooling tower and heat exchange are improved,and the two have basically the same trend.Therefore,when the wind speed is high,through different schemes to improve the air flow field distribution,the heat transfer performance of the indirect dry cooling tower can be improved.According to the comparison of different improvement programs on the indirect dry cooling tower heat transfer coefficient to improve the performance,to determine the best solution.To sum up,the heat transfer performance of the indirect dry cooling tower obtained by the model built in this paper basically reflects the actual operation status of the project.In the case of large wind speed,by improving the air flow field,can improve the heat transfer performance of the indirect dry cooling tower,which provides some reference value for the engineering practice.