Research On The Robust Control Of Blast Furnace Top Gas Pressure In Turbine Unit System

Blast Furnace Top Gas Pressure Recovery Turbine Unit (TRT) is widely accepted as a valuable secondary energy recovery device by domestic and international iron and steel enterprises. The precondition of the operation is to ensure the stability of blast furnace top pressure in any case, thus no effect on the main flow process. However, with the large-scale of metallurgical blast furnace and development of modern iron-making technology, the demand for the stability of blast furnace top pressure is higher and higher and PID control has been difficult to achieve the desired control requirements.In this paper, the study object is1#blast furnace TRT system in ShouGangQianGang Co. and the stability of blast furnace top pressure has been studied. For the characteristics of blast furnace top pressure, the thesis establishes a dynamic mathematical model of blast furnace top pressure in normal operating conditions by the method of combining mechanism analysis and parameter identification. The control system of blast furnace top pressure meets the closed-loop identifiability conditions by the theoretical analysis. Because the blast furnace top pressure exists a variety of disturbances in the normal operating conditions. Internal Model Control of strong anti-interference is used to design the IMC controller with two degrees of freedom for the blast furnace top pressure in order to improve the robustness of the blast furnace top pressure control. Through the design of electro-hydraulic servo system which is an executive body of the blast furnace top pressure, the purpose of blast furnace top pressure control is completed and a new control approach for the blast furnace top pressure of the TRT system in normal conditions is provided.Finally, the author uses the Matlab7.0/Simulink to simulate the IMC control system of the blast furnace top pressure in the model exact-match and mismatch and discusses the effects of the adjustable parameters of IMC controller on the system performance. The simulation results indicate that IMC control has better performance and easier parameter adjustment and the robustness of system can be adjusted by changing the parameters, which is easy to realize by engineering.