Numerical study of the thermo-flow performances of novel finned tubes for air-cooled condensers in power plant

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Guo, Yonghong^1 ; Du, Xiaoze^1 ; Yang, Lijun^1

Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Ministry of Education, Beijing

102206, China^1

关键词: Air cooling system;    Air-cooled condensers;    Correlating equations;    Dry cooling systems;    Finned tube bundles;    Flow and heat transfer;    Heat transfer performance;    Thermo-flow performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/4/042025/pdf
DOI  :  10.1088/1755-1315/121/4/042025

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Air-cooled condenser is the main equipment of the direct dry cooling system in a power plant, which rejects heat of the exhaust steam with the finned tube bundles. Therefore, the thermo-flow performances of the finned tubes have an important effect on the optimal operation of the direct dry cooling system. In this paper, the flow and heat transfer characteristics of the single row finned tubes with the conventional flat fins and novel jagged fins are investigated by numerical method. The flow and temperature fields of cooling air for the finned tubes are obtained. Moreover, the variations of the flow resistance and average convection heat transfer coefficient under different frontal velocity of air and jag number are presented. Finally, the correlating equations of the friction factor and Nusselt number versus the Reynolds number are fitted. The results show that with increasing the frontal velocity of air, the heat transfer performances of the finned tubes are enhanced but the pressure drop will increase accordingly, resulting in the average convection heat transfer coefficient and friction factor increasing. Meanwhile, with increasing the number of fin jag, the heat transfer performance is intensified. The present studies provide a reference in optimal designing for the air-cooled condenser of direct air cooling system.