【摘要】 利用Fluent软件中的多孔介质模型,分析了夏季环境风对空冷塔流动传热性能的影响,得到空冷塔流动传热性能最差时的环境风速.针对此环境风速下的空冷塔流场分布特点,在考虑周围厂房影响的基础上装设翅墙,对空冷塔进行安全运行改造,保障机组安全稳定运行.结果表明:当环境风速为12m/s时,空冷塔的流动传热性能最差;考虑厂房的影响后,空冷塔的通风质量流量和换热量沿周向分布的不均匀性进一步增大,其流动传热性能变差;加装翅墙后,空冷塔的穿堂风质量流量减少26.57%,通风质量流量和换热量分别增加24.55%和13.01%.更多还原

【Abstract】 The effects of cross wind speed in summer on the flow and heat transfer performance of an indirect dry cooling tower were analyzed by using the porous medium model of Fluent software,so as to find the environmental wind speed corresponding to the poorest heat transfer performance,and to retrofit the cooling tower for safety operation of the unit,in the way of adding wing walls outside the tower by considering the effects of factory buildings,based on the flow field characteristics at the wind speed.Results show that the cooling tower has the worst heat transfer performance when the cross wind speed is 12 m/s;considering the effects of factory buildings,the distribution uniformity of both the ventilation rate and the heat exchange rate is found to drop along the circumferential direction,resulting in worsened flow and heat transfer performance of the tower.After adding wing walls,the ventilation rate of draught air has been reduced by 26.57%,while the ventilation rate and heat transfer flux of the indirect dry cooling tower have been increased by 24.55% and 13.01%,respectively.更多还原