内部导流对空冷单元流动传热特性的影响

INFLUENCE OF INTERNAL FLOW GUIDING DEVICE UPON FLOW AND HEAT TRANSFER CHARACTERISTICS IN AIR-COOLED CONDENSER CELL

通过改变空冷单元内冷却空气流场温度场,可提高空冷凝汽器的传热性能。针对600 MW直接空冷机组空冷凝汽器的典型结构,建立了内部安装空气导流装置的空冷单元冷却空气流动传热过程的物理数学模型。通过CFD模拟获得了冷却空气流场和温度场,分析了不同环境因素影响下加装空气导流装置后空冷单元内空气流动传热特性的变化规律。结果表明:在空冷单元内安装导流装置能提高冷却空气流场的均匀性,降低冷却空气温度,改善空冷凝汽器的运行特性。

By changing the velocity and temperature fields of the cooling air in the condenser cell, the heat transfer performance of air-cooled condenser can be improved. Based on the typical structure of the air-cooled condenser of 600 MW unit, the physical and mathematical models for the flow and heat transfer of the cooling air in air-cooled condenser cell with internal flow guiding device were established. The velocity and temperature fields of the cooling air in the condenser cell were obtained by CFD simulation. The influence of the flow guiding device upon the flow and heat transfer of the cooling air was analyzed at different ambient conditions. The results show that the flow field uniformity of cooling air changes better and the temperature of the cooling air is reduced thus the operation performance of the air-cooled condenser is improved by installing the internal flow guiding device in the condenser cell.