一种新型进风导流装置在冷却塔中应用的数值研究

Numerical Research on the Application of New Type of Inlet-air Diversion Device in Cooling Tower

针对自然通风湿式冷却塔中心区域换热效率低的问题,提出了在雨区加装进风导流管的改进方案,并对其布置形式进行优化设计计算。以冷却塔相关理论为基础,在Fluent数值计算软件的框架下,建立了火电机组湿式冷却塔的传热传质模型,采用离散相模型分析了循环冷却水的流动与热力特性,模拟了冷却塔内部气水流场及其换热过程,重点计算了横向风对冷却塔性能的影响及中心区域换热效果差的问题。计算结果表明,采用新型进风导流装置后,冷却塔出塔水温可降低0.6℃。

Considering the low heat transfer efficiency of the central region in natural-draft cooling tower, this paper proposes an improvement scheme of installing several guide pipes in the rain zone, and calculates for its layout opti- mal design. Then based on the relative theories of the wet cooling tower, the heat and mass transfer model is con- strueted in the framework of the Fluent numerical calculation software. The discrete phase model is applied to analyze the flow and thermal characteristics of the circulating cooling water, and simulate the heat transfer process between the air and cooling water inside the cooling tower, emphatically the effects of crosswind on the performance of cooling tow- er, and the ineffectiveness of heat transfer in the center area. Calculation results show that outlet water temperature can drop 0. 6℃ with the application of the new type of inlet-air diversion device in cooling tower.