| The steel-making of Electric Arc Furnace transfers the electricity to heat by the arc between electrode and charging. The Arc and its radiation melt the metals along with slags, it is the essential way to produce the special steel and alloy.The thesis is based on the 40-Ton electric arc furnace computer distributed control system of the Second Steel-making plant. The summaries of the historic, present state and perspective trend of control techniques of electric arc furnace are based on consulting a great deal of documentation. According to the control demands of the system, the system's solving scheme is presented. The thesis thoroughly describes the hardware configuration of the computer distributed control system of electric arc furnace. Based on the design of the electrode's position control algorithm, the realization method of control algorithm is proposed. The control software is designed with the S7-300 series programming language produced by Siemens Company, including electrode's position control unit, hydraulics control unit, vacuum switch on/off control unit, changing the level of transformer control unit, oxygen gun movement control unit and other logical control units. The computer supervisory system is designed by using the configuring software WINCC, including main picture, high-voltage system picture, electrode system picture, hydraulic system picture, water-cooling system, alarm system picture and so on. |
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