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Method for operating an electric arc furnace and electric arc furnace

An electric arc furnace and electric arc technology, applied in electric furnaces, furnaces, furnace components, etc., can solve the problems of decreased melting process efficiency, increased process time, and clogging of tapping holes by waste blocks, and achieve the effect of extensive melting and homogenization.

Active Publication Date: 2016-04-20
PRIMETALS TECH AUSTRIA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This melting takes relatively much time because the temperature of the molten pool is only slightly above the liquidus temperature and the pool motion is small
[0007] Especially in the case of very large scrap pieces, the required process time increases, making the melting process less efficient
There is a risk that the individual scrap pieces are not completely melted until tapping, and in the worst case said scrap pieces block the tap opening

Method used

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  • Method for operating an electric arc furnace and electric arc furnace
  • Method for operating an electric arc furnace and electric arc furnace
  • Method for operating an electric arc furnace and electric arc furnace

Examples

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Embodiment Construction

[0051] figure 1 An electric arc furnace 2 is shown, which in this case has three electrodes 4 a , 4 b , 4 c for generating electric arcs 6 a , 6 b , 6 c for melting a scrap part 8 consisting of steel. The three electrodes 4a, 4b, 4c are arranged in a triangle here. During operation of the electric arc furnace 2 , the scrap fraction 8 is melted such that a molten pool 10 is formed. By lengthening of the arc 6a, 6b, 6c successively on each of the three electrodes 4a, 4b, 4c (in the case of simultaneously shortening the arc on the other two electrodes)—viewed in the direction of the longitudinal axis of the electrodes— - A circumferentially extended arc is produced, whereby a more extensive melting of the scrap can be achieved.

[0052] After a certain operating time of the electric arc furnace 2 , usually a multiplicity of relatively large pieces of scrap 8 that are still to be melted are still located in the formed molten pool 10 . The waste mass is no longer reached by the ...

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Abstract

The invention relates to an electric arc furnace (2) and to a method for operating an electric arc furnace (2) comprising at least one electrode (4a, 4b, 4c) for generating an electric arc (6a, 6b, 6c), in which the desired value of the current (I) guided to the electrode (4a, 4b, 4c) oscillates about a predetermined base value (I0).

Description

technical field [0001] The invention relates to a method for operating an electric arc furnace and to an electric arc furnace. Background technique [0002] An electric arc furnace is a complete plant for melting and recycling steel scrap. Depending on the various fields of application of the steel, a wide range of scrap materials are used in such electric arc furnaces. Here, the waste material can be conveyed to the electric arc furnace in the form of shavings and fine wires up to heavy carriers or even nodules with a weight of several tons. [0003] In the case of conventional electric arc furnaces, the scrap is charged into the electric arc furnace as loose fines at the beginning of the melting process. The fines can be melted very efficiently by one or more electric arcs, since the fines surround the arcs and thus absorb the radiant energy. [0004] Extensive melting of the waste material is desired here in the melting phase. That is, as soon as the surroundings of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B3/08F27B3/20F27B3/28F27D27/00H05B7/18H05B7/20C21C5/52
CPCC21C5/5211C21C2005/5288F27B3/085F27B3/20F27B3/28F27D27/00H05B7/18H05B7/20Y02P10/20
Inventor R.恩格斯M.多恩多夫K.克雷格M.海恩D.纳达奇奥内
Owner PRIMETALS TECH AUSTRIA GMBH