Adaptive Internal Model Control Strategy Research And Its Application In Ore Heat Furnace

Submerged arc furnace is the main equipment of silicon-manganese production, current import into the furnace through three electrodes, Material in the arc and resistance heating together, at a certain temperature chemical reaction of silicon-manganese alloy. Submerged arc furnace electrode lift control system directly affects the performance of silicon-manganese alloy smelting efficiency and quality, economic efficiency of enterprises. Ferroalloy production is a high energy-consuming industry, in the supply situation becomes increasingly tense situation, how to consider the submerged arc furnace electrode system of automatic control in order to reduce the energy consumption of submerged arc furnace has important practical significance and economic value.A ferroalloy plant in Shanxi Shuozhou large closed Silico-manganese furnace electrode system for the automated transformation of the research background, to achieve automatic control of electrode lifting of submerged arc furnace, improve production efficiency, reduce energy consumption, studied the main circuit of the electrode system, modeling and control strategy of these three aspects.Submerged arc furnace smelting complex response in the furnace and the three-phase’s current mutual coupling, determines the submerged arc furnace is a nonlinear, time-varying and multivariable strongly coupled systems.Point to the defect of current use electrode current main circuit of the submerged arc furnace as controlled, based on the analysis of the main circuit, using three-phase’s molten bath resistance as controlled is introduced and give the formula of molten bath resistance calculation. According to the characteristics of submerged arc furnace electrode system, established a electrode location-resistance model which the electrode position as input, and the electrode resistance bath electrode for output. On this basis, for the submerged arc furnace electrode system characteristics, designed the adaptive internal model controller, compared with the conventional PID control has the following features:less adjustable parameters; simple structure, easy to implement:can adjust parameters on-line, can overcome the object variable of system performance. Simulation results show the proposed control strategy has good dynamic characteristics. Using OPC technology seamless integration of Matlab advanced and control algorithms WinCC, the control strategy used in the automatic control of silicon-manganese furnace, running through a field test, the electrode system can greatly improve the control performance, increase productivity, reduce energy consumption.