基于PID控制的密度锁启动方案计算验证

Calculation Verification of Startup Method for Density Lock Based on PID Control

对某非能动余热排出系统,在自平衡启动方案基础上,增加了泵转速控制系统,提出了基于PID控制的密度锁启动方案。余热排出回路截止阀打开后,根据密度锁内流体温度变化调节主泵转速,使冷热流体温度分界面维持在密度锁中,确保主回路和余热排出回路的隔离。依据一维连续性方程、能量方程及动量方程对密度锁启动过程进行数值模拟。结果表明:在控制系统调节作用下,通过改变主回路质量流量,可逐渐建立2个回路之间的压力平衡,最终实现密度锁的成功启动。采用该方案可有效降低密度锁启动条件,提高密度锁启动成功率。

For the Passive Residual Heat Removal System,basing on the self-equivalence startup process,and adding pump controlling system,the startup method for density lock based on PID control system is advanced,that is,after the valve in PRHRS opening,the pump speed is controlled basing on the temperature changing in density lock,and the cold-hot liquid interface is maintained in the density lock,which ensures the PRHRS depart from the primary loop.According to the one-dimensional equations,the controlling startup process for the density lock is numerically simulated,and it is shown that under the effect of controlling system,the pressure in two loops can become balance gradually to start up the density lock successfully by changing the primary loop flux.The method makes the restrictions less and successful ration bigger for density lock startup.