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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1.7 kPa,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。
Direct cooling system to water-saving rate of 69% to 84% and is widely used in coal-fired power plants. However, if the cleaning is not done in time, the air-cooled condenser will increase the backpressure of the exhaust gas by 8kPa or more due to fouling, thereby increasing the coal consumption of the unit by 10 ~ 15g / (kWh) As a result, the water resources needed for timely cleaning are limited to the environment. In this paper, the paper designed a kind of dry purge system using compressed air instead of high-pressure demineralized water and conducted comparative experiments of two kinds of cleaning methods on single row finned tube air-cooled condenser of a 600MW direct cooling unit. In this paper, the composition, experimental contents and results of dry purge system are introduced, and the purge effect evaluation method is developed. The quantitative relationship between gray scale thermal resistance and exhaust back pressure is established. Based on the comparison between dry purge and water washing In the same cleaning cycle cumulative cleaning effect. The results show that the annual water saving in dry purging is 1.47kg / m2, the accumulated average back pressure is reduced by 1.7 kPa, and the power generation coal consumption of the unit is reduced by about 2.5g / (kWh), thus achieving a win-win situation of water saving, energy conservation and emission reduction.