摘要
通过对比600 MW直接空冷机组和湿冷机组实际运行数据和建立空冷岛变工况数学模型,研究了环境温度、迎面风速、空冷岛管外污垢热阻对背压的影响。结果表明,环境温度越高,迎面风速对背压影响越大,迎面风速越低,迎面风速对背压影响越剧烈;同时,迎面风速越低,管外污垢热阻对背压的影响越大,建议电力企业优化空冷岛布置,制定合适的冲洗周期和喷淋时机,空冷风机及时超频运行。直接空冷机组凝结水中的含氧量比湿冷机组高10.2μg/L-16.2μg/L,背压越低凝结水含氧量越高。
In the paper, by the actual operation data comparison of the 600MW direct air-cooled unit and water-cooled unit and the dynamic simulation model establishment of off-design conditions of air cooled island, the effects of surrounding temperature, the face velocity, the fouling resistance outside the tube on the backpressure are studied. The results showed that the effect of face velocity on the backpressure was more obvious at higher surrounding temperatures. In addition, with lower face velocity, the effect of face velocity was more severe and the effect of the fouling resistance outside the tube on the backpressure was also greater. It is suggested that the power enterprise should optimize air-cooled island layout and the reasonable wash cycle and spray timing of air- cooled island should be made. The ovedocking run is timely done for the air-cooled fans. The dissolved oxygen in the condensate for direct air-cooled unit was 10.2 - 16.2μg/L higher than that for water-cooled unit. The backpressure is high corresponding to the high the dissolved oxygen in the condensate.
出处
《东北电力大学学报》
2016年第1期67-73,共7页
Journal of Northeast Electric Power University
关键词
直接空冷机组
湿冷机组
背压
环境温度
迎面风速
Direct air-cooled unit
Water-cooled unit
Backpressure
Surrounding temperature
Face velocity
