Application of Intelligent Decoupling Control Method for Top Pressure of Blast Furnace

A dynamic mathematical model of top pressure and the pressure before blast furnace(BF) top gas recovery tur-bine unit(TRT) is firstly designed in this paper based on the principle of blast furnace top pressure system.Then considering the features of strong coupling,disturbance and nonlinearity of the blast furnace top system,a decoupling method combining PID control,fuzzy control and expert control is proposed,which can remove the coupling of top pressure and the pressure before TRT,and can also solve nonlinear problems about opening and flow rate of annular gap and static blade.When this decoupling control method is applied to a 2200 m³ blast furnace in a steel corporation,it is proved effective to control the fluctuation of the top pressure of blast furnace within ±2 kPa.