核电机组给水泵最小流量阀布置位置对阀门空化的影响

由于其所在管系的工艺系统特点,核电机组给水泵最小流量阀内工质很容易产生空化现象。对最小流量阀空化产生的原理进行了分析,并对某核电机组给水泵最小流量阀高低位两种布置方式进行了介绍,通过建模对两种布置方式下最小流量阀运行参数进行了计算。针对该核电机组研制的一种多级迷宫式最小流量阀,分别对两种布置方式进行了阀内流场的数值模拟计算。结果表明,低位布置可以使最小流量阀后压力提高。阀后压力的提高加上迷宫式节流槽分级降压作用,可以消除最小流量阀的空化产生。

Effect on Feedwater Pump Recirculation Valve Cavitation of Different Valve Arrangements in Nuclear Power Plant

For the characteristics of the process system, cavitation of water in feedwater pump recirculation valve in nuclear power plant can easily occur. The paper analyzes the theory of cavitation in feedwater pump recirculation valve. The paper introduces two arrangements of feedwater pump recirculation valve in a nuclear power plant which are high and low arrangements. The operation parameters of recirculation valve are calculated by establishing hydrodynamic model of recirculating pipeline for two arrangements of valve. Numerical simulation of flow field in a same multistage labyrinth recirculation valve which is developed for this nuclear power plant is done for two different arrangements.The results show that outlet pressure of valve in low arrangement is higher than that in high arrangement. With the increase of outlet pressure and multistage pressure drop of labyrinth throttling grooves, cavitation in feedwater pump recirculation valve can be eliminated.