直接空冷体系挡风墙体型系数研究

Study on the shape factor of wind-break wall of direct air-cooled system

空冷凝汽器是我国大型火力发电厂采用的新型冷却水装置.以国内某大型火电厂直接空冷体系为原形,应用Fluent软件建立数值模型,研究并确定挡风墙的体型系数,并将数值结果与试验结果进行对比分析.结果表明,数值结果与试验结果较接近,变化趋势相同,基本满足工程要求.另外,研究表明设置挡风墙是直接空冷体系有效的防风措施,且挡风墙越高散热越有利.研究结果可以为直接空冷体系的抗风设计提供依据和参考.

Air-cooled condenser is a new water-cooled device adopted by great fossil fuel power plant in China. Based on a direct air-cooled system prototype of domestic great fossil fuel power plant, the numerical model was set up using FLUENT software. The shape factors of the wind-break wall of direct air-cooled system were obtained, and the results of numerical simulation and wind tunnel test were compared. The results showed that the shape factors were approximately the same from two kinds of methods, which basically satisfied engineering requirement. In addition, this study showed that wind-break wall was an effective anti-wind measure and the higher wind-break wall was more beneficial to heat dissipation. The results can provide evidences and references for the wind-resistant design of direct air-cooled system.