SCAL式间接空冷塔分扇区配水防风方案的研究

Research on the Effect of Water Distribution by Sectors of SCAL Indirect Air-cooling Towers

借助三维数值模型,对环境侧风下间冷塔的流动规律与换热性能进行研究。结果表明:在进塔其他参数不变的情况下,间冷塔总散热量随风速增大而不断降低,是由于气流圆柱绕流导致侧风面扇区的散热量大大减少,迎风面扇区散热量虽有所提高,但不足以弥补其他扇区的散热量损失。根据各扇区散热量分布特点,提出一种新型防风方案,即按散热量比例对不同扇区进行分区配水,对通风量进行合理利用,在一定程度上减轻了侧风对间冷塔散热的影响。

The flow and heat-transfer performance of an indirect air-cooling tower were studied under crosswind conditions using three-dimensional numerical model. Results indicate that under the conditions that all other inlet parameters keep constant, the total heat dissipating capacity decreases as the crosswind speed grows, due to the great reduction of heat dissipating capacity in lateral sectors because of the flow around circular cylinder, and that the increase of heat dissipating capacity in windward sectors is not high enough to compensate the dissipating loss in other sectors. According to the characteristics of heat distribution in various sectors, a new scheme is proposed for wind protection, i.e. the circulating water is distributed on the basis of the ratio of heat release in corresponding sectors, which, to some extent, can alleviate the impacts of crosswinds on heat dissipation of the indirect air-cooling tower through reasonable ventilation.