Approximate Process Model based Collaborative Control of Blast Furnace Material Level and Temperature

The cooperative control of furnace temperature and material level is a difficult problem in the process of blast furnace ironmaking. At the same time, the process is affected by many factors, such as nonlinear, strong coupling, long delay and uncertain interference. Aiming at the cooperative control of furnace temperature and material level in blast furnace smelting process, this paper proposes an approximate process model based on the dynamic changes of material flow and energy flow in blast furnace smelting process, taking water tank level and temperature control as the object. The model is a nonlinear model, and there is a certain coupling relationship between the two controlled quantities. It is difficult to realize the cooperative control of liquid level and temperature with conventional control methods. In view of the strong coupling between the two controlled quantities, this paper proposes an intermittent alternating control method. First, we deconstruct the system into two independent subsystems, and then independently adopt the linear quadratic regulator (LQR) method on each subsystem to first control the liquid level and then the temperature in one control cycle, and then control the liquid level and then the temperature in the next cycle. Alternate to achieve their specific control objectives. The simulation results show that the intermittent alternating control method can realize the control of the approximate model, and provides a new idea for the cooperative control of blast furnace temperature and material level.