Field test on ventilation performance for high level water collecting wet cooling tower under crosswind conditions

摘要

Field test was performed on the high level water collecting wet cooling towers (HWCTs) of a 1000 MW unit to investigate ventilation performance under crosswind conditions, the circumferential inflow air distribution rules and ventilation rate were analyzed in this paper. The test results manifest that crosswind destroys the uniformity of circumferential inflow air, increases the wind velocity in the windward side, and reduces wind velocity in the lateral and leeward side. Moreover, the uniformity coefficient of circumferential inflow air and ventilation rate continuously decrease with the increasing of crosswind velocity. In this study, theta represents the angle between cross walls and crosswind direction. When crosswind velocity reaches to 3.74 m/s, the uniformity coefficient decreases to 0.61 and 0.49 under theta(1) = 5 degrees and theta(2) = 35 degrees. Compared with 0.28 m/s condition, the ventilation rate reduces by 30.13% under theta(1) = 5 degrees and 34.36% under theta(2) = 35 degrees. Additionally, at the same crosswind velocity, the smaller the theta is, the better the ventilation performance becomes. Compared with theta(2) = 35 degrees, the uniformity of circumferential inlet air is better and the ventilation rate is larger than that under theta(1) = 5 degrees condition.