横向风对湿式冷却塔热力特性影响数值研究

Numerical Study of Crosswind Effect on wet Cooling Tower Thermal Performance

基于CFD软件和湿冷塔相关理论,建立了基于Poppe理论的填料区数值求解模型,对喷淋区和雨区采用离散相模型计算。模拟了横向风对冷却塔热力特性和飘水损失的影响;提出了沿塔周设置回流槽的措施,以减少飘水损失。结果表明:横向风对出塔水温影响很大;无风时,出塔水温最低,随着风速的增加,出塔水温先升高后降低,并且,随着环境温度、湿度的不同,在横向风速为5m/s^7m/s间取得极大值。

This paper simulates the effect of crosswind on the thermal performance of wet cooling tower and puts forward a feasibility advice of fixing back flow canal around the tower to reduce the water loss . The simulation adopts discrete phase model in spray and rain zone and the numerical model which is built based on the Poppe theory in fill. Results demonstrate that the effect of crosswind on water outlet temperature is significant. The water outlet temperature is lowest under no crosswind condition,and the maximum temperature points appear between 5m/s - 7m/s crosswind velocity under different temperature and humidity conditions.