小型压水堆屏蔽泵的屏蔽套涡损计算方法及应用

Calculation Method and Application of Can Eddy Loss of the Shielded Pump of Small Pressurized Water Reactor

屏蔽泵是小型压水堆一回路的核心设备,对整个反应堆的安全性与经济性有重要影响。屏蔽泵解决了轴封泵的泄漏问题,但屏蔽套使屏蔽泵的电涡流损耗更大,且热量难以带出,因此计算屏蔽套的电涡流损耗对屏蔽泵的设计和分析十分重要。常用屏蔽泵屏蔽套涡流损耗计算经验公式是基于两极千瓦级屏蔽泵提出和修正的,对于百千瓦级小型压水堆屏蔽泵计算偏差较大,有必要对其开展研究。文章首先针对常用屏蔽泵电机屏蔽套的电涡流损耗开展有限元计算,与实验结果对比,验证了有限元计算方法的精确性;其次,在考虑小型压水堆屏蔽泵特殊设计结构对屏蔽套电涡流损耗影响的基础上,修正了经验公式,使其适用于百千瓦级小型压水堆屏蔽泵;最后,基于修正后的经验公式提出了半有限元-经验公式结合算法的初步设计算法,应用于某小型压水堆屏蔽泵的结构设计。该方法使屏蔽电机的初步设计更加便捷。

The canned pump in the small pressurized water reactor(PWR)is a core component of the primary circuit,and it significantly influences the safety and overall economy of the entire reactor.The can increases eddy current losses in the canned pump and hinders heat dissipation.Therefore,accurately calculating the eddy current losses in the can is important in the design of canned pump.The commonly used formula for calculating the can eddy loss was originally proposed and modified based on a two-pole kilowatt-level canned pump.As a result,there is a significant deviation in calculations for a 100 kW small PWR canned pump.Firstly,the finite element analysis is conducted to calculate the eddy current loss in the can,and the accuracy of this method is verified by comparing the results with experimental data.Secondly,the empirical formula is adjusted to suit the canned pump of a 100 kW small PWR.Finally,based on the revised empirical formula,a preliminary design algorithm,combining the finite element and empirical formula approach,is proposed.This algorithm is applied to the structural design of a small PWR canned pump,making the initial design of canned motors more convenient.