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空冷凝汽器积灰干式吹扫系统现场实验研究

, PP. 28-35

Keywords: 空冷凝汽器,干式吹扫,灰垢热阻,清洗周期,累计平均背压,发电煤耗

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Abstract:

直冷系统以节水率达69%~84%而在燃煤电站得到广泛应用。但在风沙大的干旱地区,若清洗不及时,空冷凝汽器则因积灰而使排汽背压升高8kPa甚或以上,机组煤耗因而升高10~15g/(kW?h),污染排放亦随之增大,而及时清洗所需的水资源又为环境所限。对此,该文设计了一种以压缩空气代替高压除盐水的干式吹扫系统,并在某600MW直冷机组单排翅片管空冷凝汽器上进行了两种清洗方式的比较实验。文中介绍了干式吹扫系统的构成、实验内容及结果,拟定了吹扫效果评价方法,建立了灰垢热阻与排汽背压的定量关联,并据以比较了干式吹扫与水洗在同一清洗周期内累计清洗效果。结果表明:干式吹扫年节水量为1.47kg/m2,累计平均背压降低1.7kPa,机组发电煤耗降低约2.5g/(kW?h),实现了节水、节能和减排共赢。

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