Application of Variable P-value PID Control in Liquid Level Control of Blast Furnace Granulation Tower
The liquid level of granulated tower has the characteristics of large inertia,large hysteresis and strong nonlinear.Because the classical proportional,integral and differential(PID)control algorithm can not meet the au-tomatic control when the flow rate increases instantaneously,this paper adopts the variable P-value PID control method to adjust the P-value according to the liquid level and the changing trend of the liquid level.The results show that the algorithm can quickly make the liquid level return to the target liquid level,the fluctuation range is reduced from 1m to 0.3m,and the effect is remarkable.When stable,the frequency changes slowly,and the pro-gramming is simple and easy to achieve,meet the level control accuracy,can extend the frequency oscillation peri-od of the motor,reduce the amplitude,and greatly increase the service life.
water flushing slag systemgranulating towerlevel controlPID controlvariable P value PID control
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