间接空冷散热器和空冷塔的流动传热特性研究

Study on Heat-flow Conduction Characteristics of Indirect Air-cooled Radiator and Cooling Tower

环境风对间接空冷散热器和空冷塔的性能影响显著。本文基于2?350 MW间接空冷机组散热器塔外垂直布置空冷系统,采用CFD数值模拟的方法对空冷散热器和空冷塔的流动换热特性进行了分析,获得了空冷散热器和空冷塔在不同环境条件下的流场、温度场和空冷机组的风量和换热量随环境风速变化的规律。结果表明:随着环境风速的增加,空冷散热器的散热量和空冷塔的通风量不断减少,在12 m/s时达到临界值,随后空冷散热器换热量随着环境风的增加有所改善。

As ambient winds have a great effect on the cooling performance of indirect air cooling system. Based on the vertical distribution air-cooled system outside 2 x 350 MW indirect air-cooled units, this paper analyzed their heat-flow conduction characteristics with CFD numerical simulation to get the transformation law which the velocity, temperature fields, amount of air and heat exchange went with wind speed under various environments. The results showed that the heat emission of air-cooled radiator and ventilation rate reduced gradually with the increase of environmental air velocity to reach the maximum at wind speed 12 m/s and then the amount of heat-exchange was improved with the increase of environmental wind.