Automatic control system and automatic control method of direct current electric arc furnace

Abstract

The invention discloses an automatic control system and an automatic control method of a direct current electric arc furnace. The automatic control system of the direct current electric arc furnace comprises a direct current electric arc furnace body, an in-furnace infrared temperature measuring device, a cathode electrode, an electrode lifting device, an in-furnace temperature control sensor, an electrical power device, a voltage control sensor, an anode electrode, a discharge temperature control sensor, a discharge infrared temperature measuring device and a feed control device. The automatic control method of the direct current electric arc furnace includes: collecting voltage values between the cathode electrode and the anode electrode in the direct current electric arc furnace body, and calculating difference values between the voltage values and a preset voltage value so as to control the electrode lifting device to rise and fall for adjusting the voltage values; collecting in-furnace temperature, and calculating different values between the in-furnace temperature and preset temperature so as to control current magnitude of a direct current power source; collecting temperature of material flowing out of a discharge port, and calculating difference values between the temperature of the material and preset temperature so as to control feed amount. The automatic control system and the automatic control method of the direct current electric arc furnace use different control parameters for amending voltage, electric arc, feeding speed and the like, avoid cross influence of the above factors, and achieve full automatic control for the direct current 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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