山体对自然通风逆流湿式冷却塔冷却性能的影响

Impact of Complex Hill on the Cooling performance of Natural Draft Counter-flow Wet Cooling Tower

针对某大风地区火电站,为分析山体对电站冷却塔冷却性能的影响及其机理,基于CFD软件Fluent建立了该机组冷却塔塔群的三维数值计算模型。同容量机组大型冷却塔实测工况及该塔年平均设计工况的相关计算验证了所建模型的正确性和适用性。计算分析表明,山体对冷却塔近山体侧进风口进风起到阻挡的不利作用;而年主导风向下,山体同时也可降低侧风所带来的不利影响。无侧风时,山体对近山侧#2塔的不利影响较大;但N向年平均主导自然风下,自然风对#2塔冷却性能的不利影响相对较小。计算结果明确了塔周山体的影响机理,为相似环境下冷却塔优化布置奠定了基础。

To analyze the neighbor hill effect on the cooling performance of the two cooling towers established at some gale area with hill, the three-dimensional numerical model was established. Relevant computation about the work conditions of some large-scale cooling tower and the design conditions of this tower validated the established model＇s correctness and adaptability. The results show that the hill obstructs the fluent inflow air at tower hill side air inlet, but also can eliminate crosswind adverse effect under the year average predominant wind direction - N direction. At windless condition, the hill＇s adverse effect on #2 tower is greater than that on #1 tower for minor distance between the hill and #2 tower. The adverse effect on #2 tower caused by N direction crosswind is smaller for the hill obstructing crosswind. The results clarify the impact mechanism of hill on the two cooling towers performance, and provide good analyses for cooling towers layout optimization under similar ambience.