Method and a control system for controlling a melting process

摘要

A method of controlling a melting process in an electric arc furnace for melting a metallic material. By means of the present disclosure it is possible to minimize desired process properties such as the melting time or the total power consumption of the melting process. The method includes the steps of receiving or collecting measured data of at least one process variable, determining the current state of the process, performing an optimization of the melting process, determining a process input based on the result of the optimization, and controlling the melting process by means of the process input. A control system is also presented herein.

主权项

1. A method of controlling a melting process in an electric arc furnace for melting a metallic material, wherein the method comprises:
i) receiving measurements of at least one process variable reflecting the melting process, ii) determining a current state of the melting process based on a model of the melting process, a previous state of the melting process, a previous control input, and the measurements of the at least one process variable, iii) determining a current process input which minimizes a desired process property, wherein the determining comprises minimizing the desired process property with respect to all allowed values of process inputs and utilizing constraints involving the current state of the melting process and a desired end state of the melting process, iv) controlling the melting process utilizing the current process input to control an electromagnetic stirrer, and v) repeating steps i) to iv) until the desired end state of the melting process has been obtained.