摘要
开展间接空冷技术在内陆缺水地区核电机组上的应用研究具有前瞻性和必要性。以内陆缺水场址建设AP1000核电机组为例,对环境侧风及大气逆温作用下常规岛间冷塔的热力特性进行深入研究,通过数值模拟,获得不同环境风速和逆温温差下,间冷塔散热量、通风量以及机组背压的变化规律。结果表明,在环境风速4~8m/s区间内,间冷塔的散热量和通风量均随风速增加而降低,机组背压随风速增加而升高。在近地面50~500m的逆温层内,间冷塔的散热量随逆温温差增加而下降,机组背压随逆温温差增加而升高,变化趋势近似成线性关系。大气逆温层温差变化1℃时对间冷塔热力性能的影响小于侧风风速变化1m/s的影响,当逆温温差4℃时,对间冷塔冷却效果的影响相当于侧风风速等于6m/s的影响。研究结果可以为AP1000核电机组间接空冷系统的设计提供参考依据。
The research of applying indirect air cooling technology in inland nuclear power plant is necessary with good prospects. The thermodynamic characteristics of AP1000 indirect dry cooling tower under environmental crosswind and temperature inversion is discussed in depth. Change regularity of heat dissipation, air flow rate and back pressure of indirect cooling tower at different ambient conditions are obtained by numerical simulations. The results show that in the range of4 m/s~8 m/s, the heat dissipation and air flow rate become deteriorated with increasing the wind speed, resulting in the increased back pressure. In the temperature inversion layer of50-500 m near the ground, the heat dissipation decreases with increasing the temperature difference, and the back pressure of the unit increases with the increase of the temperature difference. The influence of the temperature inversion layer on the thermodynamic characteristics of AP1000 indirect dry cooling tower is less than that of the cross wind speed. When the temperature difference is 4℃, the effect on cooling efficiency of AP1000 indirect dry cooling tower is equivalent to that of cross wind speed 6 m/s. The present study can provide the beneficial reference for the design of indirect air cooling system for AP1000 nuclear power plant.
引文
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