Novel direct current smelting furnace

Abstract

The invention provides a novel direct current smelting furnace, and relates to the technical field of electric arc furnaces. The novel direct current smelting furnace includes a rectification controlcircuit, a rectification power supply device, a short net device, a multi-load layout device including multiple electrodes and an electric furnace body. The rectification power supply device includesat least two dual-circuit direct current power supply groups. Four output terminals of each dual-circuit direct current power supply group are respectively connected to three electrodes in the multi-load layout device to form two current circuits through electric furnace molten pool loads. The electrodes in the multi-load layout device are connected to same-polarity output terminals of a three-phase negative half-cycle rectification output circuit and a three-phase positive half-cycle rectification output circuit through the short net device. The rectification power supply device is provided with multiple output circuit loops. The number of output circuit loops of the rectification power supply device is the same as the number of electrodes of the multi-load layout device. The novel directcurrent smelting furnace avoids the shortcomings of mismatch between a conventional multi-electrode direct current electric furnace technology and the electric furnace molten pool loads and improvesthe practical industrial application value of smelting using direct current.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 201810139429.7 and the name "New Direct Current Smelting Electric Furnace" submitted to the China Patent Office on February 11, 2018, the entire contents of which are incorporated in this application by reference, and at the same time claim 2018 The priority of the Chinese patent application with the application number 201820241594.9 and the title "New Direct Current Smelting Electric Furnace" submitted to the China Patent Office on February 11, 2018, the entire content of which is incorporated in this application by reference, and requested on May 2, 2018 The priority of the Chinese patent application with the application number 201810411134.0 and the name "New Direct Current Smelting Electric Furnace" filed with the China Patent Office on 12th, the entire content of which is incorporated in this application by reference, and the Chinese patent application is required to be s...

AI Technical Summary

Problems solved by technology

[0003] At present, smelting electric furnaces at home and abroad basically adopt AC power supply technology. The smelting electric furnaces using AC power supply technology all use power frequency 50Hz-60Hz AC power supply, and because smelting electric furnaces are low-voltage and high-current load characteristics, the ferromagnetic components around the electric furnace short network eddy current The loss is large. Because of the inductance factor of the electric furnace short-network conductive line, it is difficult to input high-current AC power into the electric furnace molten pool. The coexistence of high-current conditions and the electric furnace short-network conductive line inductance leads to a low power factor for the entire system of the AC electric furnace. The electrode arc is ignited and extinguished 100 to 120 times per second, and the arc combustion is unstable, resulting in large consumption of electrode collapse during production, high mine consumption per ton of products and high power consumption.

[0004] There are few electric furnaces using DC power supply technology. At present, DC electric furnaces using DC power supply technology basically need to use bottom electrode technology. Because the bottom electrode is easy to burn out, it is difficult to be widely used in the smelting industry.

[0005] Some domestic enterprises have tried to build and use multi-electrode DC electric furnace systems in recent years. Basically, the problem of load matching between the DC power supply device and the electric furnace melting pool has not been solved, which eventually leads to uneven power distribution in the electric furnace melting pool, and the smelting indicators in production practice Not ideal, failing to give full play to the advantages of DC power and large current transmission to bring practical industrial application value to smelting work

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