KR20200004588A - Molten steel production apparatus - Google Patents

Abstract

Disclosed is a molten steel production apparatus. According to an embodiment of the present invention, the molten steel production apparatus comprises: an electric furnace in which steel scrap is stored; a first high temperature generation unit vertically moved in the longitudinal direction of the electric furnace in an upper portion of the electric furnace and configured to dissolve the steel scrap by using first and second electrode bars that generate high temperature by receiving an alternating current power source from an alternating current power source supply unit and a third electrode bar that generates high temperature by receiving a direct current power source from a direct current power source supply unit; and a second high temperature generation unit provided on one side surface of the electric furnace and configured to dissolve the steel scrap by using a fourth electrode bar that generates high temperature by receiving the direct current power source from the direct current power source supply unit.

Description

Molten steel production apparatus

The present invention relates to a molten steel production apparatus.

In general, conventional molten steel production apparatus has produced molten steel by dissolving scrap iron using an electrode rod that generates high heat.

For example, as described in Republic of Korea Patent Publication No. 10-1482340 (2015.01.07), the position control method of the electric furnace and the electrode of the electric furnace that can produce molten steel by melting the scrap iron by controlling the position of the electrode that generates high heat is disclosed It became.

However, conventional electrode position control method of the electric furnace and the electric furnace has a limit to efficiently melt the scrap metal to produce molten steel, there is a limit to extend the life of the bottom of the electric furnace.

In addition, conventional electrode position control method of the electric furnace and the electric furnace had a limit to shorten the maintenance time, there was a limit to prevent the molten steel spill accident.

Republic of Korea Patent Publication 10-1482340 (2015.01.07)

An embodiment of the present invention is to provide a molten steel production apparatus capable of efficiently dissolving scrap metal to efficiently produce molten steel.

An embodiment of the present invention is to provide a molten steel production apparatus that can extend the life of the bottom portion of the electric furnace.

An embodiment of the present invention is to provide a molten steel production apparatus that can shorten the maintenance time.

An embodiment of the present invention is to provide a molten steel production apparatus that can prevent the molten steel spill accident.

According to an aspect of the present invention, the electric furnace accommodated scrap metal; It moves up and down in the longitudinal direction of the electric furnace in the upper part of the electric furnace, by using the first electrode and the second electrode that generates high heat by receiving AC power from the AC power supply, and generates high heat by receiving DC power from the DC power supply. A first high heat generating unit dissolving scrap iron using a third electrode; And a second high heat generating unit provided on one side of the electric furnace and dissolving scrap iron by using a fourth electrode rod supplied with DC power from a DC power supply unit to generate high heat.

According to another aspect of the invention, the AC power supply unit AC power output unit for outputting AC power; A first power cable electrically connected to one end of the AC power output unit and configured to supply AC power supplied from the AC power output unit to the first electrode; And a second power cable electrically connected to the other end of the AC power output unit and supplying AC power supplied from the AC power output unit to the second electrode.

According to another aspect of the invention, the DC power supply unit DC power output unit for outputting a DC power; A third power cable electrically connected to one end of the DC power output unit, and configured to supply DC power supplied from the DC power output unit to the third electrode; And a fourth power cable electrically connected to the other end of the DC power output unit and configured to supply DC power supplied from the DC power output unit to the fourth electrode.

According to another aspect of the present invention, the second high heat generating unit comprises a lead provided on one side of the electric furnace; A fourth electrode rod which is partially supported while being supported by the edge and receives high voltage from a DC power supply and generates high heat to dissolve scrap iron; A second support member mounted to the edge while supporting the fourth electrode; And a second connecting member electrically connecting the fourth electrode and the DC power supply to each other.

According to another aspect of the invention, the edge is provided so that a portion of the fourth electrode is exposed, the first edge supporting the fourth electrode; A second edge provided to expose a portion of the fourth electrode and provided on both sides of the first edge; A third edge provided to expose a portion of the fourth electrode and provided on top of the first edge; A fourth edge provided to expose a portion of the fourth electrode and provided below the first edge; And a fifth electrode provided to expose a portion of the fourth electrode, provided on top of the fourth edge, and provided on top of the third edge while surrounding the fourth electrode.

According to another aspect of the invention, the second support member includes a second support plate mounted to the edge while supporting the fourth electrode; And a second steel shell pressed against the edge by both ends of the second support plate.

According to another aspect of the present invention, the second connection member may include a second connection nipple electrically connecting the fourth electrode and the DC power supply to each other.

According to another aspect of the present invention, the molten iron is melted using a fifth electrode provided on the other side of the electric furnace, facing the second high heat generating portion, receiving a DC power from the DC power supply to generate high heat It may include a third high heat generating unit.

According to another aspect of the present invention, the third high heat generating portion is provided on the other side of the electric furnace, the lead provided so as to face the second high heat generating portion; A fifth electrode rod which is partially supported while being supported by the edge and which is supplied with DC power from a DC power supply to generate high heat to dissolve scrap iron; A third support member mounted to the edge while supporting the fifth electrode; And a third connecting member electrically connecting the fifth electrode and the DC power supply to each other.

According to another aspect of the invention, the edge is provided so that a portion of the fifth electrode bar is exposed, the six edges supporting the fifth electrode; A seventh edge provided to expose a portion of the fifth electrode and provided on both sides of the sixth edge; An eighth edge provided to expose a portion of the fifth electrode and provided on top of the sixth edge; A ninth edge provided at a portion of the fifth electrode and exposed under the sixth edge; And a tenth palate provided to expose a portion of the fifth electrode, provided on the ninth edge, and provided on the top of the eighth edge while surrounding the fifth electrode.

According to another aspect of the present invention, the third support member comprises: a third support plate mounted to the edge while supporting the fifth electrode; And a third steel shell pressed against the edge by both ends of the third supporting plate.

According to another aspect of the present invention, the third connecting member may include a third connecting nipple electrically connecting the fifth electrode and the DC power supply to each other.

In the molten steel production apparatus according to an embodiment of the present invention, the molten steel can be dissolved efficiently to produce molten steel efficiently.

The molten steel production apparatus according to an embodiment of the present invention can extend the life of the bottom portion of the electric furnace.

The molten steel production apparatus according to the embodiment of the present invention can shorten the maintenance time.

The molten steel production apparatus according to an embodiment of the present invention can prevent the molten steel spill accident.

1 is a view showing an molten steel production apparatus according to an embodiment of the present invention as an example.
FIG. 2 is a cross-sectional view illustrating an example in which a lead, a second support member, a second connection member, and a fourth power cable are mounted on the fourth electrode bar shown in FIG. 1; FIG.
FIG. 3 is a front view showing an example of the pontoon shown in FIG. 2 as an example. FIG.
FIG. 4 is an exploded perspective view showing the first edge shown in FIG. 3 as an example; FIG.
5 is a view showing another example of the molten steel production apparatus according to an embodiment of the present invention.
FIG. 6 is a cross-sectional view illustrating an example in which a lead, a third support member, a third connection member, and a fifth power cable are attached to the fifth electrode bar shown in FIG. 5; FIG.
FIG. 7 is a front view showing an example of the kite shown in FIG. 6; FIG.
FIG. 8 is an exploded perspective view showing the sixth edge shown in FIG. 7 as an example; FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are presented to sufficiently convey the spirit of the present invention to those skilled in the art. The present invention is not limited to the embodiments presented herein but may be embodied in other forms. The drawings may omit illustrations of parts not related to the description in order to clarify the present invention, and may be exaggerated to some extent in order to facilitate understanding.

1 is a view showing the molten steel production apparatus according to an embodiment of the present invention as an example, Figure 2 is a second electrode and the second support member and the fourth power cable in the fourth electrode bar shown in FIG. It is sectional drawing which showed the example of the mounting state.

FIG. 3 is a front view illustrating an example of a pontoon shown in FIG. 2, and FIG. 4 is an exploded perspective view illustrating the first antagon shown in FIG. 3 as an example.

5 is a view showing another example of the molten steel production apparatus according to an embodiment of the present invention, Figure 6 is a lead and the third support member and the third connecting member and the fifth power cable to the fifth electrode bar shown in FIG. It is sectional drawing which showed also the example of this mounting state.

FIG. 7 is a front view illustrating an example of the yolk shown in FIG. 6, and FIG. 8 is an exploded perspective view illustrating the sixth yogurt shown in FIG. 7 as an example.

1 to 8, the molten steel production apparatus according to an embodiment of the present invention includes an electric furnace 102, a first high heat generating unit 104, and a second high heat generating unit 106.

The first high heat generating unit 104 moves up and down in the longitudinal direction of the electric furnace 102 in the upper portion of the electric furnace 102 in which the scrap iron (S) is accommodated.

For example, the first high heat generating unit 104 may include a cylinder arm 104d, a first electrode clamper 104e, a second electrode clamper 104f, and a third electrode clamper 104g.

The cylinder arm 104d can move up and down in the longitudinal direction of the electric furnace 102 in the upper part of the electric furnace 102, and the 1st electrode clamper 104e, the 2nd electrode clamper 104f, and the 3rd electrode clamper ( 104g may be mounted on the cylinder arm 104d to maintain the clamping state of the first electrode 104a, the second electrode 104b, and the third electrode 104c, which will be described later.

In addition, the first high heat generating unit 104 receives the AC power from the AC power supply unit 103 and uses the first electrode bar 104a and the second electrode bar 104b for generating high heat, and the DC power supply unit 101 is used. Scrap metal (S) is melt | dissolved using the 3rd electrode rod 104c which generate | occur | produces a high heat | fever from DC power supply from the.

That is, the first electrode 104a and the second electrode 104b are supplied with AC power from the AC power supply 103, and the third electrode 104c is supplied with DC power from the DC power supply 101 to provide high heat. By producing an arc to dissolve the scrap iron (S) can produce molten steel.

In this case, the AC power supply unit 103 may include an AC power output unit 103a, a first power cable 103b, and a second power cable 103c, and the DC power supply unit 101 may include a DC power output unit ( 101a), third power cable 101b, and fourth power cable 101c.

The AC power output unit 103a can output AC power.

For example, although not illustrated, the AC power output unit 103a may output an AC power source using a vacuum circuit breaker (VCB) (not shown) and a transformer (not shown).

The first power cable 103b is electrically connected to one end of the AC power output unit 103a and can supply AC power supplied from the AC power output unit 103a to the first electrode rod 104a.

The second power cable 103c is electrically connected to the other end of the AC power output unit 103a, and can supply AC power supplied from the AC power output unit 103a to the second electrode 104b.

The DC power output unit 101a can output DC power.

For example, the DC power output unit 101a is not shown, but a vacuum circuit breaker (VCB) (not shown), a transformer (not shown), a thyristor (not shown), and a smoothing reactor (not shown) DC power can be output by using.

The third power cable 101b is electrically connected to one end of the DC power output unit 101a, and can supply DC power supplied from the DC power output unit 101a to the third electrode rod 104c.

As an example, the third power cable 101b can supply the negative electrode of the DC power supplied from the DC power output unit 101a to the third electrode rod 104c.

The fourth power cable 101c is electrically connected to the other end of the DC power output unit 101a, and the fourth high heat generating unit 106 will later describe the DC power supplied from the DC power output unit 101a. It can supply to the 4 electrode rod 106a.

As an example, the fourth power cable 101c can supply the positive electrode of the DC power supplied from the DC power output 101a to the fourth electrode 106a of the second high heat generating unit 106 which will be described later.

As shown in FIG. 1 and FIG. 2, the second high heat generating unit 106 is provided on one side of the electric furnace 102 and receives a DC power from the DC power supply unit 101 to generate high heat. Scrap metal S is melt | dissolved using the electrode rod 106a.

That is, the fourth electrode rod 106a receives the DC power from the DC power supply 101 to generate arc of high heat to dissolve the scrap iron S, thereby producing molten steel.

In this case, the second high heat generating unit 106 may include a fourth electrode rod 106a and a lead 106b, a second support member 106c, and a second connection member 106d.

The fourth electrode rod 106a is partially exposed while being supported by the edge 106b provided on one side of the electric furnace 102, and receives high voltage from the DC power supply 101 to generate high heat to dissolve scrap iron. have.

Here, as shown in FIGS. 2 to 4, the edge 106b includes the first edge 106b1, the second edge 106b2, the third edge 106b3, the fourth edge 106b4, and the fifth edge 106b5. ) Can be included.

At this time, the edge 106b is provided to the electric furnace 102 in order of the first edge 106b1, the third edge 106b3, the fourth edge 106b4, the second edge 106b2, and the fifth edge 106b5. Can be.

The first edge 106b1 is provided so that a part of the fourth electrode rod 106a is exposed, and can support the fourth electrode rod 106a.

In this case, the first kite 106b1 may include the eleventh kite 106b1-1, the twelfth kite 106b1-2, the thirteenth kite 106b1-3, and the fourteenth kite 106b1-4.

Such first edge 106b1 can be easily detached at the time of maintenance work of the 4th electrode rod 106a.

The second edge 106b2 may be provided to expose a part of the fourth electrode rod 106a and may be provided on both sides of the first edge 106b1.

The third edge 106b3 may be provided so that a portion of the fourth electrode rod 106a is exposed and may be provided on the upper side of the first edge 106b1.

The fourth edge 106b4 may be provided to expose a portion of the fourth electrode rod 106a and may be provided below the first edge 106b1.

The fifth edge 106b5 is provided so that a portion of the fourth electrode 106a is exposed, and is provided on the fourth edge 106b4, and surrounds the fourth electrode 106a and the upper portion of the third edge 106b3. Can be provided.

Such a fifth edge 106b5 can easily detach | desorb at the time of maintenance work of the 4th electrode rod 106a, and can interrupt the fine molten steel which flows out between the 4th electrode rod 106a and the 1st edge 106b1. .

As shown in FIG. 2, the second support member 106c can be mounted to the edge 106b while supporting the fourth electrode rod 106a.

For example, the second support member 106c may be mounted to the fifth edge 106b5 while supporting the fourth electrode rod 106a.

At this time, the second support member 106c may include a second support plate 106c1 and a second bar shell 106c2.

The second supporting plate 106c1 can be attached to the edge 106b while supporting the fourth electrode rod 106a.

For example, the second support plate 106c1 may be mounted to the fifth edge 106b5 while supporting the fourth electrode rod 106a.

The second bar shell 106c2 may be pressed onto the edge 106b by both ends of the second support plate 106c1 and mounted thereon.

As an example, the second bar shell 106c2 may be pressed onto the fifth edge 106b5 by both ends of the second support plate 106c1.

As shown in FIG. 2, the second connection member 106d may electrically connect the fourth electrode rod 106a and the DC power supply 101 to each other.

For example, the second connection member 106d may electrically connect the fourth electrode rod 106a and the fourth power cable 101c with each other.

In this case, the second connection member 106d may include a second connection nipple electrically connecting the fourth electrode rod 106a and the DC power supply 101 to each other.

For example, the second connection member 106d may include a second connection nipple electrically connecting the fourth electrode rod 106a and the fourth power cable 101c to each other.

On the other hand, the molten steel production apparatus according to an embodiment of the present invention, when at least one of the fourth electrode rod (106a) and the lead 106b is worn out and needs replacement work, the second support plate (106c1) and the second shell (106c2) ) Are separated from each other, and at least one of the worn fourth electrode rod 106a and the lead 106b can be removed, and at least one of the new fourth electrode rod 106a and the lead 106b can be reconstructed.

At this time, the molten steel production apparatus according to an embodiment of the present invention is to replace the fourth electrode (106a) newly, or if there is an electrode remaining in the length of the electric furnace 102, and then build the edge 106b again You can do it.

Thereafter, the molten steel production apparatus according to an embodiment of the present invention fixes the second support plate 106c1 and the second bar shell 106c2 to each other to be mounted on the fifth edge 106b5, and the second connection member 106d. The fourth electrode rod 106a and the fourth power cable 101c can be electrically connected to each other by using a.

5 to 8, the molten steel production apparatus according to an embodiment of the present invention may further include a third high heat generating unit 108.

The third high heat generating unit 108 is provided on the other side of the electric furnace 102, is provided to face the second high heat generating unit 106, and generates high heat by receiving DC power from the DC power supply unit 101. Scrap iron is dissolved using a fifth electrode rod 108a.

That is, the fifth electrode rod 108a receives the DC power from the DC power supply 101 to generate an arc of high heat to dissolve the scrap iron S, thereby producing molten steel.

In this case, the DC power supply unit 101 may further include a fifth power cable 101d, and the third high heat generating unit 108 may include the fifth electrode rod 108a, the lead 108b, and the third support member 108c. ) And the third connecting member 108d.

The fifth power cable 101d is electrically connected to the other end of the DC power output unit 101a and the fourth power cable 101c, and the third power source to be described later will be a DC power supply supplied from the DC power output unit 101a. It can supply to the 5th electrode rod 108a of the high heat generating part 108. FIG.

As an example, the fifth power cable 101d can supply the positive electrode of the DC power supplied from the DC power output 101a to the fifth electrode 108a of the third high heat generating unit 108 which will be described later.

The fifth electrode 108a is exposed on the edge 108b provided on the other side of the electric furnace 102 and provided to face the second high heat generating unit 106, and is partially exposed, and direct current from the DC power supply 101 It is possible to dissolve scrap iron by generating high heat by receiving power.

Here, as shown in Figs. 6 to 8, the edge 108b includes the sixth edge 108b1, the seventh edge 108b2, the eighth edge 108b3, the ninth edge 108b4, and the tenth edge 108b5. ) Can be included.

In this case, the edge 108b is provided to the furnace 102 in the order of the sixth edge 108b1, the eighth edge 108b3, the ninth edge 108b4, the seventh edge 108b2, and the tenth edge 108b5. Can be.

The sixth edge 108b1 is provided so that a part of the fifth electrode 108a is exposed, and can support the fifth electrode 108a.

In this case, the sixth kite 108b1 may include the 61st kite 108b1-1, the 62nd kite 108b1-2, the 63rd kite 108b1-3, and the 64th kite 108b1-4.

Such a sixth edge 108b1 can be easily detached at the time of maintenance work of the 5th electrode rod 108a.

The seventh edge 108b2 may be provided to expose a portion of the fifth electrode rod 108a, and may be provided on both sides of the sixth edge 108b1.

The eighth edge 108b3 may be provided to expose a portion of the fifth electrode rod 108a and may be provided on the upper portion of the sixth edge 108b1.

The ninth edge 108b4 may be provided to expose a portion of the fifth electrode rod 108a and may be provided below the sixth edge 108b1.

The tenth edge 108b5 is provided so that a portion of the fifth electrode 108a is exposed, and is provided on top of the ninth edge 108b4, and surrounds the fifth electrode 108a and the upper portion of the eighth edge 108b3. Can be provided to

Such a tenth edge 108b5 can be easily attached and detached during maintenance work of the fifth electrode 108a, and can block fine molten steel flowing out between the fifth electrode 108a and the sixth edge 108b1. .

As shown in FIG. 6, the third support member 108c may be mounted to the edge 108b while supporting the fifth electrode rod 108a.

For example, the third support member 108c may be mounted to the tenth edge 108b5 while supporting the fifth electrode rod 108a.

At this time, the third support member 108c may include a third support plate 108c1 and a third shell 108c2.

The third support plate 108c1 can be mounted to the edge 108b while supporting the fifth electrode rod 108a.

For example, the third support plate 108c1 may be mounted to the tenth edge 108b5 while supporting the fifth electrode rod 108a.

The third bar shell 108c2 may be mounted on the edge 108b by being pressed at both ends of the third support plate 108c1.

For example, the third bar shell 108c2 may be mounted to the tenth edge 108b5 by being pressed at both ends of the third support plate 108c1.

As shown in FIG. 6, the third connecting member 108d may electrically connect the fifth electrode 108a and the DC power supply 101 to each other.

For example, the third connection member 108d may electrically connect the fifth electrode rod 108a and the fifth power cable 101d with each other.

In this case, the third connecting member 108d may include a third connecting nipple electrically connecting the fifth electrode 108a and the DC power supply 101 to each other.

For example, the third connection member 108d may include a third connection nipple electrically connecting the fifth electrode 108a and the fifth power cable 101d to each other.

On the other hand, the molten steel production apparatus according to an embodiment of the present invention, when at least one of the fifth electrode (108a) and the lead 108b is worn and needs to be replaced, the third support plate (108c1) and third shell (108c2) ) Can be separated from each other, and at least one of the worn fifth electrode 108a and the lead 108b can be removed, and at least one of the new fifth electrode 108a and the lead 108b can be reconstructed.

At this time, the molten steel production apparatus according to an embodiment of the present invention is to replace the fifth electrode (108a), or if there is an electrode remaining in the length of the electric furnace (102), and then re-construct the lead 108b You can do it.

Thereafter, the molten steel production apparatus according to an embodiment of the present invention fixes the third support plate 108c1 and the third bar shell 108c2 to each other and mounts the tenth edge 108b5, and the third connection member 108d. The fifth electrode rod 108a and the fifth power cable 101d may be electrically connected to each other by using a.

As such, the molten steel production apparatus according to an embodiment of the present invention moves up and down in the longitudinal direction of the electric furnace 102 in the upper portion of the electric furnace 102, by receiving AC power from the AC power supply 103 to heat Dissolve the scrap iron S using the first electrode rod 104a and the second electrode rod 104b generated, and the third electrode rod 104c generating high heat by receiving the DC power from the DC power supply 101. A first high heat generating unit 104 is provided.

Therefore, the molten steel production apparatus according to an embodiment of the present invention can activate the upper melting of the scrap iron (S), it is possible to efficiently melt the scrap iron (S) to produce molten steel efficiently.

In addition, the molten steel production apparatus according to an embodiment of the present invention is provided with a second high heat generating unit 106 on one side of the electric furnace (102).

Therefore, the molten steel production apparatus according to an embodiment of the present invention can minimize the erosion of the lower portion of the electric furnace 102 when melting molten iron (S) to produce molten steel, thereby reducing the life of the bottom portion of the electric furnace 102. It can be extended.

In addition, the molten steel production apparatus according to an embodiment of the present invention may be further provided with a third high heat generating unit 108 on the other side of the electric furnace (102).

Therefore, the molten steel production apparatus according to an embodiment of the present invention can further minimize the bottom erosion of the electric furnace 102 when melting molten iron (S) to produce molten steel, the life of the bottom portion of the electric furnace 102 Can be extended further.

In addition, the molten steel production apparatus according to an embodiment of the present invention can be easily removed during the maintenance work of the fourth electrode rod (106a) and the fifth electrode rod (108a), it is possible to shorten the maintenance time.

In addition, the molten steel production apparatus according to an embodiment of the present invention can block the fine molten steel flowing out between the fourth electrode rod (106a) and the first edge 106b1, the fifth electrode (108a) and the sixth edge (108b1). Since fine molten steel which flows out between can be interrupted | blocked, a molten steel spill accident can be prevented.

Claims (12)

Electric furnace containing scrap metal;
It moves up and down in the longitudinal direction of the electric furnace in the upper portion of the electric furnace, by using the first electrode and the second electrode that generates high heat by receiving AC power from the AC power supply unit, and receives a high heat by receiving DC power from the DC power supply unit A first high heat generating unit dissolving the scrap iron by using a generated third electrode; And
And a second high heat generating unit provided on one side of the electric furnace and dissolving the scrap iron using a fourth electrode rod receiving high power from the DC power supply unit to generate high heat. The method of claim 1,
The AC power supply unit,
An AC power output unit for outputting the AC power;
A first power cable electrically connected to one end of the AC power output unit and supplying AC power supplied from the AC power output unit to the first electrode; And
And a second power cable electrically connected to the other end of the AC power output unit and supplying AC power supplied from the AC power output unit to the second electrode. The method of claim 1,
The DC power supply unit,
A direct current power output unit for outputting the direct current power;
A third power cable electrically connected to one end of the DC power output unit and configured to supply DC power supplied from the DC power output unit to the third electrode; And
And a fourth power cable electrically connected to the other end of the DC power output unit and supplying the DC power supplied from the DC power output unit to the fourth electrode. The method of claim 1,
The second high heat generating unit,
A lead provided on one side of the electric furnace;
A fourth electrode rod which is partially supported while being supported by the lead and receives high voltage from the direct current power supply and generates high heat to dissolve scrap iron;
A second support member mounted to the edge while supporting the fourth electrode; And
And a second connection member electrically connecting the fourth electrode and the DC power supply to each other. The method of claim 4, wherein
The kite,
A first edge provided to expose a portion of the fourth electrode and supporting the fourth electrode;
A second edge provided to expose a portion of the fourth electrode and provided on both sides of the first edge;
A third edge provided to expose a portion of the fourth electrode and provided on an upper portion of the first edge;
A fourth edge provided to expose a portion of the fourth electrode, and provided below the first edge; And
A molten steel production apparatus provided with a portion of the fourth electrode is exposed, is provided on top of the fourth electrode, the fifth electrode provided on top of the third electrode while surrounding the fourth electrode. The method of claim 4, wherein
The second support member,
A second support plate mounted to the edge while supporting the fourth electrode; And
Molten steel production apparatus comprising a second bar shell is pressed to the edge by the both ends of the second support plate. The method of claim 4, wherein
The second connection member,
And a second connection nipple electrically connecting the fourth electrode and the DC power supply to each other. The method of claim 1,
A third high heat generation provided on the other side of the electric furnace and opposed to the second high heat generating unit, and dissolving the scrap iron by using a fifth electrode rod receiving high power from the DC power supply unit to generate high heat; Molten steel production apparatus comprising a part. The method of claim 8,
The third high heat generating unit,
A lead provided on the other side of the electric furnace and provided to face the second high heat generator;
A fifth electrode rod which is partially supported while being supported by the lead and receives high voltage from the direct current power supply and generates high heat to dissolve scrap iron;
A third support member mounted to the edge while supporting the fifth electrode; And
And a third connecting member electrically connecting the fifth electrode and the DC power supply to each other. The method of claim 9,
The kite,
A sixth edge provided to expose a portion of the fifth electrode and supporting the fifth electrode;
A seventh edge provided to expose a portion of the fifth electrode and provided on both sides of the sixth edge;
An eighth edge provided to expose a portion of the fifth electrode and provided on top of the sixth edge;
A ninth edge provided to expose a portion of the fifth electrode and provided below the sixth edge; And
A molten steel production apparatus provided to expose a portion of the fifth electrode, provided on top of the ninth edge, and the tenth edge provided on top of the eighth edge while surrounding the fifth electrode. The method of claim 9,
The third support member,
A third support plate mounted to the edge while supporting the fifth electrode; And
The molten steel production apparatus comprising a third bar shell pressed against the edge by the both ends of the third support plate. The method of claim 9,
The third connecting member,
And a third connection nipple electrically connecting the fifth electrode and the DC power supply to each other.

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