干湿联合冷却塔消雾节水特性的耦合研究

随着节水、减排、环保等问题的日益严峻,消雾节水型冷却塔逐渐受重视。针对消雾节水型干湿联合冷却塔,建立其传热传质过程气水参数变化的理论计算模型,根据其出塔空气与环境空气掺混过程参数变化,计算分析其成雾特性、蒸发水量,并结合文献数据验证了计算模型的正确性。对标干湿联合冷却塔消雾验收测试的典型规程,通过出塔空气干湿球温度曲线、最大相对湿度曲线、成雾频率曲线和塔雾指数等,结合某干湿联合冷却塔实测数据,分析了干区进水比例对消雾特性、节水特性、冷却特性的影响。对所研究工况,百叶窗全开时干区进水比例越高,干湿联合冷却塔的消雾节水性能及冷却性能越好,为干湿联合冷却塔的设计优化和运行优化提供了参考和指导。

Coupling Study on Plume Abatement and Water Saving Performance for Dry-wet Cooling Tower

With the increasingly severeness of water saving, emission reduction and environmental protection, the dry-wet plume abatement cooling tower has been paid more and more attention. In this paper, a theoretical model was established to compute the variation of gas-water parameters through the heat and mass transfer process of the typical dry-wet plume abatement cooling tower. According to the variation of the air parameters in the mixing process between the exhaust moist air and the ambient air, the plume forming characteristics and evaporation water amount were calculated and analyzed, and the accuracy of the theoretical model was validated by comparing with the literature data. According to the typical acceptance test procedures for dry-wet plume abatement cooling tower, through the dry bulb temperature and wet bulb temperature curves, the maximum humidity curves, the fogging frequency curves and the tower plume indicator, the effects of water mass flow rate ratio through dry zone on the plume abatement, water saving and cooling characteristics of tower were analyzed, by combining the measured data of one real dry-wet plume abatement cooling tower. For the working conditions with louvers being full open, the higher the water mass flow rate ratio through the dry zone, the better the water-saving performance and the cooling performance of the studied tower, which provides guidance for the design and operation optimization of dry-wet combined cooling tower.