十字隔墙对湿式冷却塔性能影响的实验研究

基于热态模型实验,研究了侧风工况下不同形状十字隔墙在不同安装角度下对自然通风逆流湿式冷却塔热力性能的影响。结果表明:存在一临界风速值,当侧风速度低于此值时,冷却塔性能随风速增大而逐渐降低;当风速高于此值时,冷却性能又随风速增大而逐渐恢复。当循环水量和水温增大时,临界风速也会随之增大。安装十字隔墙可以消除侧风对冷却塔性能的不利影响。低风速下,实型和孔隙十字隔墙均可改善冷却塔进风,提高冷却塔热力性能,实型墙效果更好;高风速下,孔隙十字隔墙效果反而优于实型墙。在所研究风速范围内,安装角度为0时十字隔墙的效果要好于45时的效果;在风速较高时,45十字隔墙甚至会降低冷却塔的性能。

Experimental Study of Cross Walls Effect on the Performance of Wet Cooling Towers

The effect of cross walls on the thermal performance of natural draft wet cooling towers(NDWCT) under crosswind conditions was investigated experimentally.Results from the hot model test demonstrate that crosswinds have an adverse effect on the NDWCT performance at common velocities,but the performance has a recovery at high crosswind velocities.When the circulating water flow rate and the inlet water temperature increase,the critical crosswind velocity rises accordingly,which results in the lowest NDWCT performance.Installing cross walls in the rain zone can improve the thermal performance of the NDWCT,which is dependent on the crosswind velocity,cross wall shape and setting angle.At low crosswind velocities,the solid wall leads to better NDWCT performance than the porous wall.However,the opposite effect is obtained at high crosswind velocities.At all crosswind velocities,the cross wall at a setting angle of 0 between the crosswind direction and the cross wall results in higher performance than that at a setting angle of 45,regardless of cross wall shapes.Moreover,the cross wall at a setting angle of 45 degrades the thermal performance of the NDWCT under high crosswind conditions.