An automatic control system and control method for a DC electric arc furnace

Abstract

The invention discloses an automatic control system of a DC electric arc furnace and a control method thereof, comprising a DC electric arc furnace body, an infrared temperature measuring device in the furnace, a cathode electrode, an electrode lifting device, a temperature control sensor in the furnace, a power supply device, and a voltage control device. sensor, anode electrode, discharge temperature control sensor, discharge infrared temperature measuring device and feed control device. Collect the voltage value between the cathode electrode and the anode electrode in the DC electric arc furnace body, calculate the difference between the preset voltage value and control the electrode lifting device to adjust the voltage value; collect the temperature in the furnace, calculate the difference between the preset temperature value and control the DC power supply Current size; collect the temperature of the material flowing out of the discharge port, calculate the difference with the preset temperature to control the feed amount. The present invention uses different control parameters to correct the voltage, electric arc, feeding speed, etc., avoids the cross influence of the above factors, and realizes the complete automatic control of the DC electric arc furnace.

Description

technical field [0001] The invention relates to an automatic control system and a control method thereof, in particular to an automatic control system and a control method of a DC electric arc furnace. Background technique [0002] The DC electric arc furnace is smelted by generating an arc on the metal charge between the furnace bottom electrode (anode) and the graphite electrode (cathode). The main difference between the DC electric arc furnace and the AC electric arc furnace equipment: the addition of rectification devices, the change of three top graphite electrodes into one, and the addition of furnace bottom electrodes, etc. Among them, the setting of furnace bottom electrode is the biggest feature of DC electric arc furnace. The main advantages of DC electric arc furnace are: stable and concentrated arc, good stirring of molten pool, uniform temperature distribution in the furnace, less erosion of furnace lining; small fluctuations in current and voltage, reduced imp...

AI Technical Summary

Problems solved by technology

[0006] The limitation of these two traditional control methods is that they can only adjust the parameter fluctuations of the power supply itself (current, voltage), but cannot automatically respond to parameters such as furnace temperature and slag discharge temperature.

In essence, only the automatic control of the power supply and the electrode lifting device can be realized, but the overall automatic control of the DC electric arc furnace cannot be realized

However, in the actual operation process, both the feed rate and the slag discharge temperature will have an impact on the operating conditions of the DC electric arc furnace

With traditional control methods, operators can only judge these parameter fluctuations based on experience and adjust them manually, but this actually reduces the degree of automation of the equipment.

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