Decoupling Control Method With Fuzzy Theory for Top Pressure of Blast Furnace

This brief presents a fuzzy decoupling control (FDC) system to control the top pressure of a blast furnace (BF). First, a dynamic mathematical model of the top pressure is carried out based on the analysis of the wet-type top-gas cleaning and recovery system of the BF. Then, considering the characteristics of nonlinearity and strong coupling in the model, an FDC system that consists of two fuzzy PID controllers, a fuzzy decoupling controller, and two linear correction adjusters is presented. Finally, after the effectiveness of this method was verified by simulations, it was implemented in a real-world BF. The results show that the method kept the error of the top pressure between -2 and 2 kPa.