Numerical Analysis of Control Valve Open Ratio Effect on Letdown Flow
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摘要: 对某压水堆核电站化学和容积控制系统(RCV)的下泄管路,采用Flowmaster程序作为计算平台进行了正常工况下的热工水力计算。分析了下泄调节阀RCV013VP的开度对下泄流量以及下泄管路中的一些物理参数的影响。计算结果表明,RCV013VP的阀门开度小于60%时,阀门开度对下泄流量影响显著;阀门开度大于60%时,下泄流量不再随阀门开度增加而明显变化。正常工况下即使RCV013VP全开,下泄流冷却剂也不会发生气化现象,但随着RCV013VP开度的增加,下泄管路冷却剂压力会越来越接近其对应温度下的饱和压力。Abstract: The internal flow and heat transfer in the letdown pipes of Chemical and Volume Control System（RCV） are investigated with numerical simulation,and Flowmaster V7 is employed to achieve these objects.The effect of control valve RCV013VP open ratio on the letdown flowrate and other physical variables is numerically investigated.The results show that the letdown flowrate is sensible when RCV013VP open ratio is less than 60%,while the letdown flowrate seems to be independent with the valve open ratio when it is more than 60%.In the normal operation,even if the RCV013VP is fully open,flashing will not occur in the letdown pipes.As the control valve opens more,coolant pressure in the letdown pipes will be closer to the coolant saturation pressure at the corresponding letdown temperature.
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Key words:
- Pressurized Water Reactor /
- Chemical and Volume Control System /
- Control Valve /
- Flashing
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