Research And Control Of The Blast Furnace Dumping System

The main characteristic of modern iron making with blast furnace is large scale. With the capability increase and the pressure rise, earlier bell top furnace has become the problems of huge equipment and uneven dumping, and aren't suitable for the iron making requirement. In 1970's, the arising of bell-less top solves the problems of dumping and top seal thoroughly. At present, bell-less top control is an advanced representative of modern blast furnace. The bell-less top control is a key part in the blast furnace control system, which makes great sense to the enhancing blast furnace utilization.The dumping and improvement of bell-less top furnace for the No.1 blast furnace in Tangshan Steel Company that is representative is studied in the paper. The problem of the original equipment and system is deeply analyzed, we propose the new solution for the control system. Through studying on the top-dumping rule of the blast furnace, dumping curves related to the production guidance is set up and basis to realizing different dumping methods are provided. Making the most of the available equipment of the original system because of limited fund, we select the compatible hardware with the original system and the corresponding procedure flow chart is also designed. Studying the regulating valve of material flow-pivotal equipment of the dumping control, original system use the classical PID controller to control the opening angel, but not yet got more excellent effect. When fuzzy control is used, regulating time and overshoot always can achieve the specification, but system cause steady-state error. So it comes to a new method of combining them together.The patameters of Kp, Ki and Kd are adjust by fuzzy inference.Experimental results illustrate that the fuzzy PID parameters controller achieved the system performance index.The scheme of fuzzy PID control is a ideal method.Since the system is improved, it runs stably and reliably, which meets the requirement of manufacture control and verifies the effectiveness of proposed scheme.