Heat Load Operation Range of Plate Heat Exchanger of Component Cooling System for NPP at Extra-Low Temperature Site
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摘要: 为了防止低温厂址条件引起的设备冷却水系统(RRI)换热器出口温度低于设计限值甚至冻结,导致因冷却过度引起丧失最终热阱,红沿河核电厂RRI换热器采用了热负荷分区运行。在一定的设计限值范围内,分析重要厂用水系统(SEC)水力学设计和RRI/SEC换热计算的设计输入和边界条件,计算单个热负荷分区的边界,并推导热负荷分区的总和。热负荷分区运行是红沿河核电厂1#和2#机组RRI换热器运行方式的基本思想,为低温厂址条件下,RRI/SEC传热运行方式提供了重要的设计参考。Abstract: The temperature of sea water at Hongyanhe nuclear power plant is too low that the temperature of Component Cooling System（RRI） might be lower than the limit, even the water might be frozen in the heat exchangers. It would cause the lost of final heat trap. Heat load subarea operation was performed to provide RRI from the low temperature. The edge of single subarea was calculated and the summation of total subareas were reckoned, based on the design limit, by the analysis of the input and boundary of both Essential Water System（SEC） hydrodynamic and RRI/SEC heat exchanging calculation. Designing of heat load subarea was the most important academic base of RRI heat exchanging design at Hongyanhe. This method informed a valuable example for the RRI heat exchanging design at low temperature sites.
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Key words:
- Component Cooling System /
- Heat load /
- Subarea /
- Extra-low temperature site
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