KR20240077134A - electric furnace and methods of operating electric furnace - Google Patents

Abstract

An electric furnace and a method of operating the electric furnace are provided. The electric furnace includes at least one melting furnace, at least a portion of which is disposed within the melting furnace, and at least one of which includes a first alternating current electrode, a second alternating current electrode, and a third alternating current electrode member extending in a first direction, and the first alternating current electrode member. It includes a raw material input member disposed between the first AC electrode, the second AC electrode, and the third AC electrode with respect to a plane intersecting one direction.

Description

Electric furnace and methods of operating electric furnace {electric furnace and methods of operating electric furnace}

The present invention relates to an electric furnace and a method of operating the electric furnace.

In general, the steel material production process in the steel industry is largely divided into a blast furnace-converter production system that uses ore as the main raw material, and an electric furnace production system that uses scrap as the main raw material that is recovered/recycled after commercializing the produced steel materials. It can be divided into systems.

And recently, as carbon neutrality has become a global issue, the electric arc furnace process, which generates ≤20% of CO2 compared to the converter process, is emerging as an alternative for future steel production.

This type of electric furnace has entered the stage of producing high-quality sheet materials by utilizing large quantities of OBM's (Ore Based Materials), and recently, as an electric furnace that has been further improved from the current electric furnace that operates in a single melting furnace, DRI Research on furnaces for continuous injection and large-quantity/high-speed dissolution of ethanol is actively underway.

When inputting raw materials into an electric furnace, the raw materials do not dissolve smoothly in the molten steel and slag in the electric furnace, and agglomeration may occur. Accordingly, the problem of increasing total operating time may result.

The problem to be solved by the present invention is to provide an electric furnace and a method of operating the electric furnace that can improve the solubility of raw materials and shorten the operating time.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

An electric furnace according to an embodiment for solving the above problem includes at least one melting furnace, at least a portion of which is disposed within the melting furnace, and at least one of which is a first alternating current electrode, a second alternating current electrode, and a third alternating current electrode extending in the first direction. An alternating current electrode member including an alternating current electrode member, and a raw material input member disposed between the first alternating current electrode, the second alternating current electrode, and the third alternating current electrode with respect to a plane intersecting the first direction.

The raw material input member may be made of the same material as the first AC electrode, the second AC electrode, and the third AC electrode.

The raw material input member may be made of carbon material.

The raw material input member may further include a gas injection unit.

The gas blowing unit may blow gas while the raw material input member discharges the raw material.

The gas may be at least one selected from argon (Ar) gas, methane (CH4) gas, nitrogen (N2) gas, carbon dioxide (CO2) gas, and oxygen (O2) gas.

The gas inlet may apply kinetic energy to the raw material through the gas discharged.

The raw material input member may inject raw materials between the first AC electrode, the second AC electrode, and the third AC electrode with respect to the plane.

The raw material may include at least one of direct reduced iron (DRI) and hot briquette iron (HBI).

The first direction and the plane may be perpendicular to each other.

An electric furnace according to an embodiment for solving the above problem includes at least one melting furnace, at least a portion of which is disposed within the melting furnace, and at least one of which is a first alternating current electrode, a second alternating current electrode, and a third alternating current electrode extending in the first direction. An alternating current electrode member including an alternating current electrode member, and a raw material input member, wherein the raw material input member is positioned between the first alternating current electrode, the second alternating current electrode, and the third alternating current electrode with respect to a plane intersecting the first direction. Insert raw materials.

The raw material input member may further include a gas injection unit.

The gas blowing unit may blow gas while the raw material input member discharges the raw material.

The gas inlet may apply kinetic energy to the raw material through the gas discharged.

The raw material input member may be disposed between the first AC electrode, the second AC electrode, and the third AC electrode with respect to the plane.

A method of operating an electric furnace according to an embodiment for solving the above problem is a method of operating an electric furnace including a melting furnace, an alternating current electrode member, and a raw material input member, including the steps of storing molten steel and slag inside the melting furnace, and the raw material input member. A step of injecting a raw material toward the molten steel and/or the slag, and a step of blowing a first gas by the raw material injecting member toward the molten steel and/or the slag while injecting the raw material, wherein the raw material Kinetic energy increases due to the first gas.

Before the step of introducing the raw material, the raw material input member further includes blowing a second gas toward the slag, wherein the slag is divided into a first area where the second gas reaches and an area where the second gas does not reach. It includes a second region, and the average thickness of the first region may be smaller than the average thickness of the second region.

In the step of introducing the raw material, the raw material input member may inject the raw material into the first region of the slag.

The AC electrode member includes a first AC electrode, a second AC electrode, and a third AC electrode extending in a first direction, and in the step of inputting the raw material, the raw material input member intersects the first direction. The raw material may be introduced between the first AC electrode, the second AC electrode, and the third AC electrode based on a plane.

The AC electrode member includes a first AC electrode, a second AC electrode, and a third AC electrode extending in a first direction, and the raw material input member is configured to provide the first AC electrode with respect to a plane intersecting the first direction. It may be disposed between the electrode, the second AC electrode, and the third AC electrode.

Specific details of other embodiments are included in the detailed description and drawings.

The electric furnace and operating method of the electric furnace of the present invention to solve the above problems can input raw materials in large quantities and at high speed, and can improve the solubility of the input raw materials. Accordingly, the overall operating time can be shortened, productivity can be improved, and energy usage can be reduced.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a diagram showing a cross section of an electric furnace according to an embodiment.
FIG. 2 is a diagram showing a cross section taken along line II-II' in FIG. 1.
Figure 3 is an enlarged cross-sectional view of the area around the other end of the raw material input member in Figure 1.
Figure 4 is a flowchart for explaining a method of operating an electric furnace according to an embodiment.
5 and 6 are enlarged cross-sectional views for explaining a method of operating an electric furnace according to an embodiment.
Figures 7 and 8 are enlarged cross-sectional views for explaining a method of operating an electric furnace according to another embodiment.
Figure 9 is a cross-sectional view of an electric furnace according to another embodiment.
FIG. 10 is an enlarged cross-sectional view of the area around the end of the raw material input member in FIG. 9.

In this specification, when a component (or region, layer, portion, etc.) is referred to as being “on,” “connected to,” or “coupled to” another component, it is directly placed/on the other component. This means that they can be connected/combined or a third component can be placed between them.

Like reference numerals refer to like elements. Additionally, in the drawings, the thickness, proportions, and dimensions of components are exaggerated for effective explanation of technical content.

“And/or” includes all combinations of one or more that the associated configurations may define.

Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component without departing from the scope of the present invention, and similarly, the second component may also be named a first component. Singular expressions include plural expressions unless the context clearly dictates otherwise.

Additionally, terms such as “below,” “on the lower side,” “above,” and “on the upper side” are used to describe the relationship between the components shown in the drawings. The above terms are relative concepts and are explained based on the direction indicated in the drawings.

Unless otherwise defined, all terms (including technical terms and scientific terms) used in this specification have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Additionally, terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and unless interpreted in an idealized or overly formal sense, are explicitly defined herein. do.

Terms such as “include” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but do not include one or more other features, numbers, or steps. , it should be understood that it does not exclude in advance the possibility of the existence or addition of operations, components, parts, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In embodiments, the first direction DR1 and the second direction DR2 represent directions that intersect each other in different directions, for example, directions that intersect vertically in a cross-sectional view. The third direction DR3 is a direction that intersects the plane on which the first direction DR1 and the second direction DR2 are located, for example, a direction that intersects perpendicularly to both the first direction DR1 and the second direction DR2. represents. One side of the third direction DR3 refers to the upper direction in the cross-sectional view, and the other side of the third direction DR3 refers to the lower direction in the cross-sectional view. However, the directions mentioned in the examples should be understood as referring to relative directions, and the examples are not limited to the mentioned directions.

1 is a diagram showing a cross section of an electric furnace according to an embodiment. FIG. 2 is a diagram showing a cross section taken along line II-II' in FIG. 1.

Referring to Figures 1 and 2, the electric furnace 10 stores raw materials such as metals, alloys, direct reduced iron, ore-based iron sources (OBM's: Ore Based Materials), and low-grain scrap (Scrap) inside, and generates electricity. Energy can be used to heat and dissolve raw materials. Hereinafter, the raw material is described as direct reduced iron including DRI (Direct reduced iron), HBI (Hot briquetted iron), and Iron carbide, but is not limited thereto.

The electric furnace 10 may include a melting furnace 100, an alternating current electrode member 200, a raw material storage member 300, a raw material supply pipe 400, and a raw material input member 500. Although each of the raw material storage member 300, the raw material supply pipe 400, and the raw material input member 500 is expressed as being provided one by one, this is not limited, and each may be provided in two or more pieces.

The melting furnace 100 may include a storage member 110 and a cover member 120. The storage member 110 accommodates raw materials, and the accommodated raw materials can be heated within the storage member 110. The storage member 110 may be made of a heat-resistant, fire-resistant metal material to prevent damage even in a high-temperature environment. The storage member 110 may be provided with an opening 111 that allows raw materials to be charged into the storage member 110.

Figure 1 shows a case where molten steel 20 and slag 30 are accommodated inside the storage member 110. Molten steel 20 and slag 30 may be accommodated inside the storage member 110 . The molten steel 20 may be manufactured by melting raw materials, and the slag 30 may be formed on the upper side of the molten steel 20. The molten steel 20 and the slag 30 may be in a molten state in layers at the bottom and top, respectively.

The cover member 120 opens and closes the opening 111. The cover member 120 is located on the upper side of the storage member 110 and may be provided in a shape to cover the opening 111. The cover member 120 may be made of a heat-resistant, fire-resistant metal material to prevent damage even in a high-temperature environment. The cover member 120 may be made of the same material as the storage member 110, but is not limited thereto.

The alternating current electrode member 200 may be disposed at the top of the electric furnace 10. The alternating current electrode member 200 may be provided on the cover member 120. One side of the alternating current electrode member 200 may be disposed outside the melting furnace 100, and the other side may be disposed inside the melting furnace 100.

The AC electrode member 200 can apply electric energy to the raw material charged into the storage member 110. Through the electric energy applied by the AC electrode member 200, the raw material in the storage member 110 may be melted. Although not limited thereto, for example, the AC electrode member 200 may cause an arc to be generated between the AC electrode member 200 and the charged raw material, thereby dissolving the charged raw material.

The AC electrode member 200 may include a first AC electrode 210, a second AC electrode 220, and a third AC electrode 230. Three-phase alternating current may be applied to the alternating current electrode member 200 through the first alternating current electrode 210, the second alternating current electrode 220, and the third alternating current electrode 230. Each of the first AC electrode 210, the second AC electrode 220, and the third AC electrode 230 may be connected to a power source (not shown) capable of providing three-phase AC.

The first AC electrode 210, the second AC electrode 220, and the third AC electrode 230 may extend in substantially the same direction. Each of the first AC electrode 210, the second AC electrode 220, and the third AC electrode 230 may extend in the third direction DR3, but is not limited thereto.

The raw material storage member 300 provides a storage space for storing raw materials to be charged into the interior of the electric furnace 10, that is, the interior of the storage member 110, and can store the raw materials. The raw material storage member 300 may be located on the upper side of the cover member 120 (one side in the third direction DR3), but is not limited thereto.

The raw material supply pipe 400 may have one side connected to the raw material storage member 300, extend from the lower part of the raw material storage member 300, and be connected to the raw material input member 500 on the other side. The raw material supply pipe 400 may deliver the raw material stored in the raw material storage member 300 to the raw material input member 500.

The raw material input member 500 may serve to deliver raw materials into the storage member 110. One side of the raw material input member 500 may be disposed outside the melting furnace 100, and the other side may be disposed inside the melting furnace 100. The raw material input member 500 may extend in substantially the same direction as the first to third alternating current electrodes 210, 220, and 230, but is not limited thereto. For example, the raw material input member 500 may extend in the third direction DR3.

The raw material input member 500 may include a separate component that can improve the charging speed of the raw material. For example, the raw material input member 500 may include a gas inlet 510. The gas injection unit 510 is connected to the raw material input member 500 and can blow the blowing gas (G, see FIG. 3) into the raw material input member 500. Alternatively, the singer blowing unit 510 may provide blowing gas (G, see Figure 3) to spray the blowing gas (G, see Figure 3) from the raw material input member 500. The gas injection unit 510 can increase the kinetic energy of the raw material charged into the melting furnace 100 by the raw material input member 500.

The raw material input member 500 may be disposed between the first to third alternating current electrodes 210, 220, and 230. The first to third alternating current electrodes 210, 220, and 230 may be disposed around the raw material input member 500 with the raw material input member 500 as the reference. Each of the straight line distances between the raw material input member 500 and the first to third AC electrodes 210, 220, and 230 may not be greater than the straight line distance between the first to third AC electrodes 210, 220, and 230. Here, the straight line distance may refer to the straight line distance between adjacent raw material input members 500 and the first to third alternating current electrodes 210, 220, and 230.

Specifically, the raw material input member 500 is circular or first to third alternating current electrodes 210, 220, and 230 in a cross-sectional view cut by a plane intersecting the third direction DR3. It may be placed within a polygon with the third AC electrodes 210, 220, and 230 as vertices.

For example, as shown in FIG. 2, on a cross-section cut by a plane that intersects the third direction DR3 and includes the first direction DR1 and the second direction DR2, the first AC electrode 210 is the first AC electrode 210. It may include a center 211, the second AC electrode 220 may include a second center 221, and the third AC electrode 230 may include a third center 231. The center area CA may be defined by an imaginary line connecting the first center 211, the second center 221, and the third center 231 in the cross-sectional view. In the drawing, the central area (CA) is expressed as a circle, but it is not limited to this, and the central area (CA) has the first center 211, the second center 221, and the third center 231 as vertices. It may also have a polygonal shape.

In the cross-sectional view, at least a portion of the raw material input member 500 may be disposed within the central area CA. The raw material input member 500 may be disposed at the same distance from each of the first center 211, the second center 221, and the third center 231, but is not limited thereto.

A peripheral area (SA) may be formed around the central area (CA). In other words, the peripheral area (SA) is an area other than the central area (CA) defined by the first to third AC electrodes (210, 220, and 230). The central area (CA) has a higher average temperature than the surrounding area (SA).

One end of the raw material input member 500 (one side in the third direction DR3) is connected to the raw material supply pipe 400, and the other end (the other side in the third direction DR3) may be disposed in the melting furnace 100. When the raw material input member 500 extends in the direction in which the first to third AC electrodes 210, 220, and 230 extend (third direction DR3), the third direction DR3 of the raw material input member 500 ) The other end may be placed within the central area (CA).

The raw material charged through the raw material input member 500 may be charged to an area having a relatively higher temperature than the surrounding area. The raw material 40 (see FIG. 3) may be charged between the first to third alternating current electrodes 210, 220, and 230 in a plane view. In other words, the raw material can be charged into the center area (CA) on the plane. When molten steel 20 and slag 30 are accommodated in the melting furnace 100, raw materials may be charged onto the slag 30 located in the center area CA on a planar surface.

As the raw material input member 500 is disposed in the center area CA, the raw material charged through the raw material input member 500 can be more smoothly charged into the center area CA.

As the raw material is placed between the first to third alternating current electrodes 210, 220, and 230 on a plane, the raw material can be dissolved more quickly. In other words, the raw material can be charged into the central area (CA) where the temperature is relatively high and, therefore, can be dissolved more quickly. In addition, even if raw materials are continuously charged at high speed, agglomeration of raw materials (Ferrobergs, Icebergs, etc.) can be suppressed and prevented. Therefore, the total operating time can be shortened and productivity can be improved.

In addition, the raw material input member 500 may be made of substantially the same material as the first to third alternating current electrodes 210, 220, and 230. For example, the raw material input member 500 may be composed of carbon as a main raw material. Accordingly, the fire resistance and heat resistance of the raw material input member 500 can be improved, and the safety of operation can be improved.

Figure 3 is an enlarged cross-sectional view of the area around the other end of the raw material input member in Figure 1. In Figure 3, the first center 211 of the first AC electrode 210 and the second center 221 of the second AC electrode 220 are shown, but the third center 231 of the third AC electrode 230 has been omitted. In addition, the area between the first center 211 and the second center 221 was expressed as a central area (CA), and the remaining area was expressed as a peripheral area (SA).

Referring further to FIG. 3, the gas injection unit 510 may blow the blowing gas (G). The blowing gas (G) may be blown while the raw material 40 is charged. By the blowing gas (G), additional kinetic energy as well as kinetic energy converted into potential energy can be applied to the raw material 40.

Specifically, the raw material 40 may be stored in the raw material storage member 300 and have potential energy. As the raw material 40 passes through the raw material supply pipe 400 and the raw material input member 500, the potential energy may be converted into kinetic energy. While the raw material 40 passes through the raw material input member 500, it may have additional kinetic energy due to the blowing gas (G) blown into the raw material input member 500. In addition, even if the raw material 40 is ejected from the raw material input member 500, it may have additional kinetic energy due to the blowing gas G injected from the raw material input member 500.

The blowing gas (G) is at least one gas selected from argon (Ar) gas (Gas), methane (CH ₄ ) gas, nitrogen (N ₂ ) gas, carbon dioxide (CO ₂ ) gas, and oxygen (O ₂ ) gas. It may include, but is not limited to this. The blowing gas (G) may include various gases that can be used in the electric furnace (10).

The raw material 40 may have additional kinetic energy in the third direction DR3. Accordingly, the raw material 40 can be charged into the center area CA and enter the molten steel 20 through the slag 30 in a shorter time. Accordingly, the time for the raw material 40 to dissolve can be shortened.

As additional kinetic energy is applied to the raw material 40 by the blowing gas (G) blown from the gas injection unit 510, a larger amount of raw material can be charged in a short time. That is, it is possible to input a large amount of the raw material 40 and to input it at high speed. Accordingly, operating time can be shortened and production efficiency can be improved. In addition, by using the blowing gas G, the raw materials 40 can be charged in a wider range, thereby suppressing or preventing the agglomeration of the raw materials.

Hereinafter, a method of operating an electric furnace according to an embodiment will be described with reference to FIGS. 4 to 6 .

Figure 4 is a flowchart for explaining a method of operating an electric furnace according to an embodiment.

5 and 6 are enlarged cross-sectional views for explaining a method of operating an electric furnace according to an embodiment.

Referring to FIGS. 4 and 5, first, molten steel 20 and slag 30 are accommodated in the melting furnace 100 (see FIG. 1) of the electric furnace 10 (see FIG. 1) (S1). Next, the first blowing gas (G1) is blown toward the slag (30) (S2).

Specifically, before charging the raw material 40 (see FIG. 6), the first blowing gas G1 may be preferentially injected in the third direction DR3 by the raw material input member 500. Most of the blowing gas G sprayed by the raw material input member 500 can reach the slag 30 located in the center area CA.

The raw material input member 500 may further include a control unit (not shown) that controls the gas injection unit 510 (see FIG. 1). By a control unit (not shown), the first blowing gas G1 may be controlled to have kinetic energy capable of reaching a partial depth of the slag 30.

In this case, the thickness (width in the third direction DR3) of the slag 30 may decrease in some areas where the first blowing gas G1 reaches. Specifically, the slag 30 may include a first area (AR1) and a second area (AR2). The first area AR1 is an area where the first blowing gas G1 has arrived, and the second area AR2 is an area where the first blowing gas G1 has not arrived.

The first blowing gas G1 may push the slag 30 in the reached area to the surroundings, and accordingly, the thickness of the slag 30 in the area may decrease. The slag 30 may have a thickness smaller in the first area AR1 than in the second area AR2. That is, the average thickness of the first region AR1 of the slag 30 may be smaller than the average thickness of the second region AR2 of the slag 30.

The first area AR1 may be located within the central area CA, and the second area AR2 may be located across the central area CA and the peripheral area SA. However, it is not limited to this.

Referring to FIGS. 4 and 6 , the raw material 40 is charged through the raw material input member 500 (S3). While the raw material 40 is being charged, the second blowing gas G2 is blown toward the raw material 40 (S4).

Specifically, the raw material input member 500 may inject the raw material 40 while maintaining the reduced thickness of the first area AR1 by spraying the second blowing gas G2. At this time, the raw material 40 may be charged into the first area AR1 of the slag 30. The second blowing gas (G2) may be substantially the same as the first blowing gas (G1, see FIG. 5). The first blowing gas (G1, see FIG. 5) and the second blowing gas (G2) are injected continuously and may be substantially the same.

The raw material 40 can not only obtain additional kinetic energy by the second blowing gas G2, but can also be charged onto the slag 30 whose thickness has been reduced by the second blowing gas G2. That is, as the raw material 40, which has gained additional kinetic energy, is charged into the first region AR1 of the slag 30 with a smaller thickness, the raw material 40 can be more quickly introduced into the molten steel 20. . As a result, the time for the raw material 40 to dissolve can be further shortened.

Below, other embodiments are described. In the following embodiments, the description of the same configuration as the already described embodiment will be omitted or simplified, and the differences will be mainly explained.

Figures 7 and 8 are enlarged cross-sectional views for explaining a method of operating an electric furnace according to another embodiment.

Referring to FIGS. 7 and 8 , the first area AR1_1 of the slag 30 according to the present embodiment is different from the embodiment of FIGS. 5 and 6 in that the molten steel 20 is exposed.

Specifically, the first blowing gas G1 sprayed from the raw material input member 500 may pass through the layer formed by the slag 30 and reach a partial depth of the molten steel 20. Accordingly, the slag 30 may expose the molten steel 20 in some areas by the first blowing gas G1. In other words, the slag 30 may include a first area (AR1_1) exposing the molten steel 20, and a second area (AR2_1) overlapping the molten steel 20 and covering the molten steel 20.

The raw material 40 may be charged into the first region AR1_1 while obtaining additional kinetic energy by the second blowing gas G2. In this case, the raw material 40 can be directly input into the molten steel 20 without passing through the slag 30. Accordingly, the time for the raw material 40 to dissolve can be further shortened.

Figure 9 is a cross-sectional view of an electric furnace according to another embodiment. Figure 10 is an enlarged cross-sectional view of the area around the end of the raw material input member in Figure 9.

9 and 10, the electric furnace 10_2 according to this embodiment includes a raw material input member 500_2, and the raw material 40 is charged into the center area CA, but the raw material input member 500_2 It is different from the embodiment of FIGS. 1 to 3 in that it is not disposed between the first to third AC electrodes 210, 220, and 230.

To be specific, the raw material input member 500_2 may be disposed in the peripheral area SA. Furthermore, the other end of the raw material input member 500_2 may be disposed in the peripheral area SA. The raw material input member 500_2 can inject blowing gas (G), and the raw material 40 can obtain kinetic energy in the first direction (DR1) and the second direction (DR2) by the blowing gas (G). . Accordingly, even if the other end of the raw material input member 500_2 is disposed in the peripheral area SA, the raw material 40 can be charged into the central area CA.

The raw material input member 500_2 takes into account the position of the other end of the raw material input member 500_2, the position of the center area (CA), the water levels of the slag 30 and the molten steel 20, and the weight of the raw material 40, etc. It may further include a control unit (not shown) that can adjust the injection intensity of the blowing gas (G).

Even in this case, as the raw material 40 is charged into the central area CA, the dissolution rate of the raw material 40 can be improved. In addition, when the raw material input member 500_2 is placed in the peripheral area SA, the raw material input member 500_2 can be placed in a wider space, making assembly of the electric furnace 10_2 easier.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. You will be able to understand it. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents.

10: electric furnace 20: molten steel
30: Slag 100: Melting furnace
110: storage member 120: cover member
200: AC electrode member 210: First AC electrode
220: second AC electrode 230: third AC electrode
300: Raw material storage member 400: Raw material supply pipe
500: Raw material input member 510: Gas inlet
CA: Central area SA: Peripheral area
AR1: First area AR2: Second area

Claims (20)

at least one furnace;
an alternating current electrode member, at least a portion of which is disposed within the melting furnace and including a first alternating current electrode, a second alternating current electrode, and a third alternating current electrode, at least one of which extends in a first direction; and
An electric furnace comprising a raw material input member disposed between the first AC electrode, the second AC electrode, and the third AC electrode with respect to a plane intersecting the first direction. According to claim 1,
The raw material input member is an electric furnace made of the same material as the first AC electrode, the second AC electrode, and the third AC electrode. According to clause 2,
The raw material input member is an electric furnace made of carbon. According to claim 1,
The raw material input member is an electric furnace further including a gas injection unit. According to clause 4,
The gas injection unit is an electric furnace that blows gas while the raw material input member discharges the raw material. According to clause 5,
The gas is at least one selected from argon (Ar) gas, methane (CH4) gas, nitrogen (N2) gas, carbon dioxide (CO2) gas, and oxygen (O2) gas. According to clause 5,
An electric furnace in which the gas inlet applies kinetic energy to the raw material through the gas discharged. According to claim 1,
The raw material input member is an electric furnace for injecting raw materials between the first AC electrode, the second AC electrode, and the third AC electrode with respect to the plane. According to clause 8,
The raw material is an electric furnace containing at least one of direct reduced iron (DRI) and hot briquette iron (HBI). According to claim 1,
The first direction and the plane are orthogonal to each other. at least one furnace;
an alternating current electrode member, at least a portion of which is disposed within the melting furnace and including a first alternating current electrode, a second alternating current electrode, and a third alternating current electrode, at least one of which extends in a first direction; and
Including the absence of raw material input,
The raw material input member is an electric furnace for injecting raw materials between the first AC electrode, the second AC electrode, and the third AC electrode with respect to a plane intersecting the first direction. According to claim 11,
The raw material input member is an electric furnace further including a gas injection unit. According to claim 12,
The gas injection unit is an electric furnace that blows gas while the raw material input member discharges the raw material. According to claim 13,
An electric furnace in which the gas inlet applies kinetic energy to the raw material through the gas discharged. According to claim 11,
The raw material input member is an electric furnace disposed between the first AC electrode, the second AC electrode, and the third AC electrode with respect to the plane. A method of operating an electric furnace comprising a melting furnace, an alternating current electrode member, and a raw material input member,
storing molten steel and slag inside the melting furnace;
Injecting raw materials, by the raw material input member, into the molten steel and/or the slag; and
Including the step of the raw material input member blowing a first gas toward the molten steel and/or the slag while introducing the raw material,
The raw material is an electric furnace operation method in which kinetic energy is increased by the first gas. According to claim 16,
Before the step of introducing the raw material, the raw material input member further includes blowing a second gas toward the slag,
The slag includes a first area where the second gas reaches and a second area where the second gas does not reach,
An electric furnace operating method wherein the average thickness of the first region is smaller than the average thickness of the second region. According to claim 17,
In the step of introducing the raw material, the raw material input member injects the raw material into the first region of the slag. According to claim 16,
The AC electrode member includes a first AC electrode, a second AC electrode, and a third AC electrode extending in a first direction,
In the step of introducing the raw material, the raw material input member is an electric furnace for injecting the raw material between the first AC electrode, the second AC electrode, and the third AC electrode with respect to a plane intersecting the first direction. Fishing method. According to claim 16,
The AC electrode member includes a first AC electrode, a second AC electrode, and a third AC electrode extending in a first direction,
The raw material input member is disposed between the first AC electrode, the second AC electrode, and the third AC electrode with respect to a plane intersecting the first direction.

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