Hot plume reversed and recirculation flows through air-cooled condensers at ambient winds in a power plant
The adverse impacts of ambient winds on air-cooled condensers are recognized as the key issues to the deterioration of the thermo-hydraulic performances for direct dry cooling system in a power plant.It is of benefit to the design improvement and operation optimization for air-cooled condensers to clarify the detailed fluid and heat flows through the A-frame finned tube bundles.Based on a representative 2 600MW W direct dry cooling power plant,the velocity and temperature fields of cooling air in the A-frame plenum chamber and through finned tube bundles,and the hot plume reversed and recirculation flows are presented by using the CFD approach and the raster graphics process software.The hot plume reversed flows happened at the upwind condenser cells and the recirculation flows at the both sides of condenser cells are analyzed,in which the recirculation flow ratio is calculated to quantitatively characterize the performance deterioration.The results show that the reversed flows only occur in the upwind condenser cells at high wind speeds.The recirculation flows always take place at any wind speed in the wind direction of 0° and at low wind speeds in the wind direction of 90°,but only occur at the both sides of the upwind and central condenser cells at high wind speeds in the wind direction of 90°.In spite of the reversed and recirculation flows through air-cooled condensers,the thermo-hydraulic performances of air-cooled condensers are both deteriorated.It can be of significance to the flow field leading of cooling air and ambient winds for the direct dry cooling system in a power plant.
Air-cooled condenser Finned tube bundle Axial flow fan Hot plume reversed flow Hot plume recirculation flow
Yongdong Bu Lijun Yang Xiaoze Du Yongping Yang
School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China
国际会议
桂林
英文
1-17
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）