On Stability Control Method For The Top Gas Pressure Of Blast Furnace Based On Trt System

Blast Furnace TOP Gas Pressure Reeovery Turbine Unit (TRT) is widely accepted as an effective seeondary energy reeycle device by domestic and international iron and steel enterprises. Because TRT Unit in operation does not need fuel, without degrading the quality of top gas orin and fluencing gas consumer's normal use. However, it recycles considerable energy and lowers the cost of smelting. It is a typical energy-saving and green project as it has significant economical benefits and meanwhile reduces noise during the proeess. The prerequisite to operate TRT Unit is to ensure the stability of blast furnace top gas pressure. Therefore, while TRT Unit is promoted by the metallurgical enterprises and research sector, one after another blast furnace to the stability control of blast furnace top gas pressure accepts widely research and development as an important work,Based on the reconstruction of Capital Steel Company 2# TRT control system, in accordance with the actual production requirements, the data processing systems of the original system is reconstructed using fuzzy expert system to control. In order to maintain the continuity of the system operation, the original Symphony Rack system is replaced with ABB DCS control system.Based on control requirements of the top gas pressure of the TRT, the stability factors of top gas pressure are analysed. The construction model of top-pressure control system is established through analyzing the configuration of TRT system firstly. And using classical step response method to identify the system parameter, a practicable system model was deduced with the static blade opening degree and bypass valves opening degree as the control objects and with the blast furnace top gas pressure as the control variables. Then the pipeline system is analysed in range instantaneous while the balance control equations of the pipeline system are established. The theoretics foundation is proposed for the design of control with analyzing the stability control of top-pressure.The expert system is introduced as well as the development situation, the construction step and also the advantages and classification of the expert system. Based on these above, the design of the fussy expert systems controller is presented, in order to improve the control effect and to enhance the robustness of the control system. Therefore, the theoretical basis is provided for the applications of the locale reconstruction.Finally, the components of the TRT control system, including logic control systems, feedback control systems and the monitoring system, are designed. Based on the characteristics of the ABB DCS system, the hardware systems, including the configuration of the process control station, the configuration of the Project I/O module and the configuration of hardware parameters, are designed; Also the software systems, including monitoring software system, process control software system, are designed.After the reconstruction to operation of this system, the control effect is improved obviously. And the indicators have reached the industry-leading level.