Automatic control system of blast furnace TRT

This paper briefly introduces the application of DCS in a blast furnace TRT. The process basic scheme, configuration of the control system and its main functions are described. The master, controller and control net are reduplicated on purpose to improve the reliability of the control system, When TRT trips, one of the valves group for reducing gas pressure is opened fast to avoid the increase of blast furnace top pressure rapidly. In order to stabilize the roof pressure of the blast furnace during TRT operation, an initial feedback control loop is used in the regulative static blade control and a perfect control result is achieved in practical application.