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防风网对空冷岛换热性能影响的数值模拟

DOI: 10.13334/j.0258-8013.pcsee.2015.04.017, PP. 898-905

Keywords: 防风网,空冷岛,换热性能,数值模拟

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Abstract:

以国内某2×300MW直接空冷机组为例,利用FLUENT软件,数值模拟空冷平台下部加装防风网对空冷岛换热性能的影响,并对比分析了加装防风网前后,空冷岛附近的空气流场以及温度场变化规律。结果表明:加装防风网能够提高大风天气下风机出力,抑制“热风回流”的产生,提高空冷岛换热性能。分别分析了在不同风速的炉后来风和侧边来风下,安装不同开孔率和网高的防风网对空冷岛换热效率的影响规律,发现加装开孔率为6%、13%防风网的空冷岛换热效率一般低于开孔率为25%、44%的换热效率;空冷岛换热效率随着防风网高度的增大呈现先上升后下降的趋势,最优防风网结构是开孔率为25%、网高为12m。研究结果为直接空冷机组加装合适结构的防风网提供了理论依据。

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