核电主蒸汽阀站中电磁先导阀的动态响应仿真研究

Simulation on dynamic response of solenoid pilot valve in main steam valve set of nuclear power plant

针对核电主蒸汽阀站中关键部件之一——大气释放阀前置隔离阀在实际工况中常出现响应超时的问题,采用数值仿真软件Fluent中的动网格以及用户自定义函数技术,对控制其启闭过程的电磁先导阀动态响应过程进行了研究。首先,研究了电磁先导阀中先导结构的动态响应过程以及阀杆的受力情况;然后,研究了电磁先导阀中主阀的动态响应过程以及主阀泄压时阀内的压力和速度分布情况;最后,综合两个动态过程,分析了电磁先导阀整阀的运动时间。研究结果表明,电磁先导阀的运动时间为8.5 ms,其中先导结构的运动时间占比较小,85%的时间集中在电磁先导阀主阀动作过程。该研究结果可对前置隔离阀响应时间的优化提供参考。

Aiming at the phenomenon where the below down isolation valve(BDIV)of atmospheric release valve which is one of the key components in the main steam valve set(MSVS)of nuclear power plant tends to respond over the fixed time in the actual working condition,the dynamic response process of solenoid pilot valve controlling the opening and closing process of BDIV was analyzed.During the process of analysis,the method of dynamic mesh and user defined function(UDF)technology in the software Fluent were used.First,the moving process of the pilot structure of the solenoid pilot valve was simulated,and the relationship between its axial displacement and the fluid force of the valve stem with time was analyzed.Then,the dynamic response process during the opening of the main valve of the solenoid pilot valve was simulated,and the pressure and velocity distribution were analyzed at the time when the main valve of solenoid pilot valve began to release the pressure.Finally,the motion time of the whole solenoid pilot valve was analyzed by synthesizing the dynamic response process of different stages.The results of the research show that the moving time of the solenoid pilot valve is 8.5 ms,in which the moving time of the pilot structure is relatively small.Also,the conclusion that 85%of the time is concentrated on the dynamic opening process of main valve in the solenoid pilot valve can be drawn.This research provides a reference for optimizing the response time of the BDIV.