Automatic regulating device of DC electric arc furnace electrode and control method thereof

Abstract

The invention discloses an automatic regulating device of a DC electric arc furnace electrode and a control method thereof, which comprise an electric arc furnace, a lifting cylinder, a contact tube, an graphite electrode, an arc voltage and current regulating control system and a main power supply loop, wherein the external side of the electric arc furnace is provided with the lifting cylinder, the top of the lifting cylinder is provided with the contact tube, the tail end of the contact tube is provided with the graphite electrode which is erected into the interior of the electric arc furnace, and the arc voltage and current regulating control system is connected with the contact tube, the lifting cylinder and the electric furnace and is simultaneously connected with the main power supply loop. In the invention, the arc voltage and current regulating control system controls a hydraulic proportional valve to control the up-and-down motion of the graphite electrode so as to change the distance between the electrode and the steel liquid level, so the arc length can be controlled to realize the purpose of controlling the arc voltage; a rectifier control system controls the size of the trigger angle Alpha of a rectifier thyristor so as to realize the purpose of controlling the arc current; and the invention has high control accuracy, safety and reliability, and can timely and accurately control the size of the arc voltage and the arc current.

Description

technical field [0001] The invention relates to a DC electric arc furnace, in particular to an automatic adjustment device for arc voltage and arc current of electrodes of a DC electric arc furnace and a control method thereof. Background technique [0002] The rapid development of DC electric arc furnaces in my country began in the 1990s, and they were basically imported from abroad. The imported control system is not open and difficult to maintain. Once a problem occurs in the system, it cannot be found and tracked, which will affect production. And the cost of spare parts of the imported control system is high, the service cost is high, and the one-time investment cost is also high. The electrode regulation control system, one of the core technologies of the electric arc furnace, has reached a period of high incidence of accidents, and the spare parts are outdated. Most of the components have been eliminated and cannot be purchased. This has threatened the steelmaking pro...

AI Technical Summary

Problems solved by technology

[0003] Domestic DC electric arc furnace electrode regulators are relatively backward in control technology, basically for low-power DC electric arc furnaces, and have low control accuracy, slow instantaneous response, easy arc breaking, large arc voltage and arc current fluctuations, and power consumption per ton of steel. High electrode consumption, low power factor, relatively large impact on rectifiers, transformers and power grids

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