Method and device for testing arcing voltage parameters of direct-current electric arc furnace

Abstract

The invention relates to a method and a device for testing arcing voltage parameters of a direct-current electric arc furnace, and belongs to the technical field of industrial smelting. The method comprises the steps that S1, a direct-current electric arc furnace power supply device is controlled to output preset amplitude voltage Us, meanwhile, an electrode is controlled to descend, and a loop current signal I and a pressure intensity signal P are collected; s2, in the electrode descending process, threshold judgment is carried out on a detection signal; s3, when I is larger than or equal to Ist in the electrode descending process, the electric arc furnace power supply equipment stops outputting voltage, the electrode is controlled to be kept at the current position, and an arcing voltage parameter test is conducted; s4, repeating the test for n times; and S5, substituting test data, and calculating for multiple times to obtain a load resistance R and an arcing voltage reference value Ust = R * Ist. Reliable arcing voltage parameters can be provided for a power supply device of the direct-current electric arc furnace, the arcing process of the direct-current electric arc furnace is optimized, the arcing current impact is reduced, and the phenomenon of arcing failure caused by the difference of furnace charge conductivity is avoided.

Description

technical field [0001] The invention belongs to the technical field of industrial smelting, and relates to a method and a device for testing arc voltage parameters of a DC electric arc furnace. Background technique [0002] The DC electric arc furnace is developed on the basis of the ultra-high-power electric arc furnace. It is a combination of various related technologies of the ultra-high-power electric arc furnace and contemporary high-efficiency, high-power semiconductor converter technology. Compared with the traditional AC electric arc furnace, the DC electric arc furnace has obvious advantages in arc stability and heat transfer. At the same time, its smelting process has less interference and impact on the power grid, and has a high grid-side power factor. It is an important development in industrial smelting. trend. [0003] However, the DC electric arc furnace power supply equipment system is more complicated. Compared with the AC electric arc furnace system, an AC...

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Problems solved by technology

[0003] However, the DC electric arc furnace power supply equipment system is relatively complex. Compared with the AC electric arc furnace system, an AC-DC conversion module is added, and the output voltage and current of the power supply equipment need to be controlled in real time during the entire smelting process, making the system control difficult.

Among them, during the arcing process of smelting, due to the change of the contact area between the electrode and the charge material or the difference in the conductivity of the charge material, the same arc starting voltage is prone to current shock or frequent arc interruption, which affects the overall smelting stability and reduces smelting efficiency.

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