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间接空冷塔部分冷却扇段关闭热力特性的数值研究

DOI: 10.13334/j.0258-8013.pcsee.2015.18.014, PP. 4682-4689

Keywords: 空冷塔,流量分配,数值模拟,侧风,热力性能

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Abstract:

以某600MW机组大型间接空冷塔为对象,分别建立了塔内循环水流量分配模型与空冷塔数值计算模型,针对冷却扇段全部投运、侧面扇段关闭和迎风扇段关闭这3种模式下,侧风对空冷塔热力性能的影响进行了数值模拟。结果表明,在小风速下,关闭侧面或迎风扇段后,其他扇段散热量较扇段全部投运时增加,而扇段内循环水温降有所下降。在大风速下,受塔内外复杂流场及扇段间相互作用的影响,扇段热力性能的变化不尽相同。综合空冷塔冷却效率和防冻需求,为机组经济安全运行提供了参考。

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