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基于波形翅片扁平管传热性能的直接空冷凝汽器低温冻结规律研究

DOI: 10.13334/j.0258-8013.pcsee.2014.26.007, PP. 4493-4499

Keywords: 直接空冷凝汽器,翅片管传热关联式,凝结水冻结,对流换热

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Abstract:

以火电空冷机组常用的蛇形翅片扁平管为实验件,设计并搭建了风洞实验台,研究蛇形翅片扁平管顺流单元的传热性能,得到顺流单元翅片管空气侧在不同风速下的换热系数和水侧在不同流量下的换热系数,并拟合成Nu随Re变化的无因次关联式。将得到的关联式应用到火电厂实际的运行工况中,得到在不同迎面风速、不同环境温度及不同水流量下管内凝结水温度的变化规律。据此,以实际低温运行直接空冷机组为例,预测出空冷凝汽器顺流单元在不同迎面风速、环境温度和机组负荷下管内凝结水的冻结特性。

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