Effect of low wind resistance streamlined wind deflectors on performance of naturally ventilated wet cooling towers
In order to improve the flow field structure of rain area in cooling tower and further increase the ventilation,on the basis of the existing flat plate type wind guide plate,this paper proposes a streamline wind guide plate with low wind resistance that can be arranged in the rain area.Under the design condition,by taking the conventional cooling tower and the reformed tower with flat plate-type air guide plate arranged at each height as the reference objects,the influences of the low wind resistance streamline air guide plate on ventilation,flow field structure and temperature distribution of the whole tower are analyzed,at five different arrangement heights(1/6,1/3,1/2,2/3,5/6 air intake height).The results show that,with the rise of the height of the air guide plate arrangement,the air distribution in each region of the tower has changed,which has a significant effect on the packing heat exchange in inner zone,so that the cooling performance of the whole tower improves at first and then declines.When arranging the streamlined wind guide plate at 2/3 height of the air inlet,the ventilation increment and the average temperature reduction at the bottom of the filler area reaches the optimal value,and the improvement effect of the cooling tower performance is the best.Compared with the conventional cooling tower,the circulating water temperature drop and the ventilation increases by 2.65%and 2.78%,respectively.In addition,the circulating water temperature drop increases by 1.2%after the tower is retrofitted with a low wind resistance streamlined air guide,compared with the flat plate with an optimal arrangement height.
万方数据
维普
