运行条件对自然通风湿式冷却塔性能影响的实验研究

为研究得到湿式冷却塔最佳运行工况,搭建了自然通风湿式冷却塔实验系统。在保证结构参数不变的情况下,通过改变循环水进塔水温、循环水流量、环境大气干球温度、相对湿度等因素,研究得到不同运行条件下冷却塔性能的变化规律,并对其分析优化,从而取得高性能的运行工况。研究结果表明:在设定工况下,循环水流量对冷却性能几乎没有影响;循环水进塔温度高有利于增大冷却温差和冷却效率,但超过某特定值冷却效率趋于平缓;提高环境空气干球温度冷却温差和冷却效率逐渐减小,且进塔水温越高,环境干球温度的影响越大;空气相对湿度增大将导致冷却性能和冷却效率显著下降;随着侧风风速的增大,冷却性能先减小后增大,存在临界风速值。

Experimental Study on the Effect of Operating Conditions on Performance of Natural Wet Cooling Tower

Abstract In order to optimize the performance of the cooling tower, the experiment system of natural wet cooling tower(NWCT) were conducted. It is to obtain change regulation and high performance operating conditions of cooling performance from NWCT by changing the flow&temperature of circulating water and the dry bulb temperature&relative humidity of environmental air. Results show that the circulating water flow will have little impact on the cooling performance under some conditions. Increasing feed-water temperature is beneficial to increase the cooling temperature difference and cooling efficiency, and cooling efficiency levelling off beyond a certain value. The cooling efficiency and cooling temperature difference will decreases when improving environmental air dry bulb temperature, and the higher feed water temperature are, the more effect of the environment will be to the NWCT. Increasing the air relative humidity will lead to decrease the cooling performance and cooling efficiency significantly. With the increase of crosswind velocity, the cooling performance decreases firstly and then increases beyond critical wind velocity.