Investigation on Draft Equation for Natural Draft Dry Cooling Tower

被引：0
|
作者：
Sun M. [1 ]
Wei H. [1 ]
Yang L. [1 ]
Du X. [1 ]
机构：
[1] Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2020年 / 40卷 / 03期
关键词：
Density difference; Draft force; Natural draft cooling tower; The ambient air temperature; The inlet temperature of the circulating water;
D O I：
10.13334/j.0258-8013.pcsee.190154
中图分类号：
学科分类号：
摘要：
In the design of cooling tower, it is widely used to calculate the draft according to the difference of air density inside and outside the tower, but there is a lack of theoretical basis. The calculation results have errors in some cases. The Kröger model is more accurate but more complex. Taking the natural draft dry cooling tower as the analytical model, the accuracy of the density difference algorithm and the Kröger algorithm through the experiment and numerical simulation were compared in this paper. The results shows that the latter is more accurate in calculating the draft. The Kröger algorithm provides a mathematical theoretical foundation. What’s more, the factors why the error of density difference algorithm is slightly bigger than Kröger algorithm are analized that the height of cooling tower, the ambient air temperature and the inlet temperature of circulating water. The conclusions are that when the ambient temperature and the inlet temperature of the circulating water are constant, the relative error of the draft by the density difference algorithm increases with the height of cooling tower increasing compared to the Kröger algorithm, then the relative error of heat transfer rate increases. Similarly, when the other two conditions are constant, the relative error of draft increases as the ambient temperature increases or the inlet temperature of the circulating water decreases. This study lays a theoretical foundation for the design and calculation of the natural draft cooling tower. © 2020 Chin. Soc. for Elec. Eng.
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页码：859 / 866
页数：7
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