周围建筑物对间冷塔换热性能的影响分析

Analysis of Influence of Buildings Around on Heat Transfer Performance of Indirect Dry Cooling Tower

火电厂间接空气冷却塔(间冷塔)除受环境风速影响外,其周围的建筑物对其换热性能也有一定的影响。以某电厂600 MW间接空冷机组为研究对象,为有效提高间冷塔的换热效率,建立了间冷塔几何及数值计算模型;采用Fluent软件中多孔介质模型和Heat Exchanger Model模型,通过数值计算分析了不同环境风速对间冷塔换热的影响;对间冷塔周围有建筑物和无建筑物时的换热性能进行了对比分析。结果表明:无环境风时,间冷塔周围有无建筑物对塔换热性能无影响;有环境风时,间冷塔周围有无建筑物的换热性能都随风速的增大先减小后增加,但是两者的最小值不同,无建筑物为12 m/s,有建筑物5. 5 m/s;建筑物对大风情况下间冷塔的换热性能改善效果显著。

In addition to environmental wind speed,the buildings around also have influence on the heat transfer performance of indirect dry cooling tower.To improve the heat transfer efficiency of the indirect dry cooling tower,this paper took a 600MW indirect dry cooling unit in a power plant as the research object and established geometric and numerical calculation models of the indirect dry cooling tower.Porous media model and Heat Exchanger Model in Fluent software were adopted to analyze the influence of different environmental wind speeds on the heat transfer between indirect dry cooling towers.The heat transfer performance of the indirect dry cooling tower with and without buildings around were compared and analyzed.The results show that:in the absence of environmental wind,the heat transfer performances of the indirect dry cooling tower with and without buildings around have no differences;while there is environmental wind,whether the tower has buildings around or not,the heat transfer performance of the cooling tower decreases first and then increases with the increase of wind speed.However,the minimum quantity of ventilation and heat transfer occurs at 12m/s when there are no buildings around,while at 5.5m/s when there are buildings around.Therefore,buildings can improve the heat transfer performance between indirect dry cooling towers in the case of strong wind.