Double-electrode DC arc furnace arc ignition device and method thereof

Abstract

The invention discloses a double-electrode DC arc furnace arc ignition device and method thereof. The device includes a melting furnace, a DC power source, an anode electrode, a cathode electrode, ananode voltage measuring unit, a cathode voltage measuring unit, an arc ignition metal plate, a metal ground electrode and a thermocouple, wherein one end of an anode resistor is connected with a positive pole of the DC power source, one end of a cathode resistor is connected with a negative pole of the DC power source, the other end of the anode resistor and the other end of the cathode resistor are grounded, both ends of the anode voltage measuring unit are respectively connected with both ends of the anode resistor, both ends of the cathode voltage measuring unit are respectively connected with both ends of the cathode resistor, the arc ignition metal plate is horizontally disposed on an upper side of a solidified slag layer, the metal ground electrode penetrates into the melting furnacefrom a lower end of the melting furnace, an upper end of the metal ground electrode is in contact with a solidified metal layer, a lower end of the metal ground electrode is grounded, and the thermocouple is placed inside the metal ground electrode. The device is advantaged in that the device has strong operability and high success rate of arc ignition and can be easily transformed into an automatic control program to realize automatic arc ignition.

Description

technical field [0001] The invention relates to an electric arc furnace arc striking device and its method, in particular to a double-electrode DC electric arc furnace arc striking device and its method. Background technique [0002] DC plasma arc melting technology is currently the more commonly used fly ash / inorganic waste melting furnace method. The fly ash / inorganic waste is melted by the thermal energy generated by the DC arc. Double-electrode DC arc technology, such as CN201710305547.6, uses double electrodes as cathode and anode, which eliminates the need for conductive furnace bottom electrodes, simplifies the design of the furnace bottom structure, and has good process controllability. The bottom of the double-electrode electric arc furnace is equipped with a metal layer grounding device to detect the voltage on the cathode side and the anode side, and to perform arc ignition steps, such as image 3 shown. Here, we define the arc ignition stage from the start of t...

AI Technical Summary

Problems solved by technology

[0008] The first method is only theoretically feasible, it is difficult to guarantee the success rate of arc ignition, and no new arc ignition method is given;

[0009] In addition to unstable arc ignition, the second method will also generate graphite electrode fragments, which may block the slag discharge port

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