The Establishment And Optimization Of The Power Curve Of Electric Arc Furnace Considering The Electrode Consumption

Electric Arc Furnace (EAF) has become one of the most important steel-making equipments in the field of metallurgy. Beginning with the equipments, the crafts and the history of development of EAF, the paper makes emphases on introducing the present state and perspective of EAF power-supply strategy based on consulting a great deal of documents.The paper deals with the study of power-supply system of EAF, the electric characteristics of EAF are analysed in detail, the electric working scope of EAF is identified and the outstanding virtues of high-impedance EAF are summarized based on the equivalent circuit of EAF.A nonlinear work reactance model is established by some interrelated electric parameters. And the work reactance model is verified according to the field electric parameters of the 40-Ton high-impedance EAF which is the research background of the paper, and the result is satisfied.High energy consumption is the main shortcoming in EAF steel-making, a reasonable power-supply strategy plays a key role in solving the problem. Based on the work that pointing out the shortcoming of conventional power-supply methods on establishing electrode current, a nonlinear optimization model is established considering the smelt time, electric power consumption and electrode consumption, and the corrosion-exponent is considered as a main condition between different stages of the smelting. According to the designing of genetic algorithms (GA), the optimization results are worked out which contain the optimized work voltage, work reactance and work current. Finally, the power curve is designed on the basis of the optimization results and the actual conditions of the 40-Ton high-impedance EAF.