KR101613579B1 - Apparatus for preheating scrap and electric furnaces - Google Patents

Abstract

The present invention provides a scrap preheating apparatus. The scrap preheater of the present invention comprises a cylindrical preheating chamber arranged horizontally; Wherein the preheating chamber includes a plurality of preheating zones arranged radially about the central axis of the preheating chamber and storing scrap to preheat scrap by hot exhaust gas discharged from the furnace body, And a moving unit for moving the scrap so that the scrap is sequentially moved along the plurality of preheating zones.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scrap preheating apparatus and an electric furnace,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric arc furnace, and more particularly, to a scrap preheater and an electric furnace for reusing hot exhaust gas discharged from a furnace body for scrap preheating.

The steelmaking process includes blast furnace steelmaking, which uses iron ore as a raw material, and electric arc furnace steelmaking, which recycles iron scrap as a raw material. The energy consumption of the electric arc furnace is 40% compared with the blast furnace and the carbon dioxide emission is 30%. In other words, the electric arc furnace has advantages such as simple steelmaking process, total energy (electricity + fuel) consumption and carbon emission, because it has no coke process and sintering process compared to blast furnace, Consuming a huge amount of power.

In such an electric furnace, a technique for preheating scrap used for electric furnace operation using waste heat of flue gas has been developed. However, in the case of existing preheating apparatus, since the residence time of scrap is short, it is not possible to efficiently perform preheating or to increase the residence time The size of the facility is increased and the installation cost is excessively generated.

In addition, existing preheating devices have problems such as leakage of exhaust gas or introduction of outside air into the melting furnace / preheating device.

It is an object of the present invention to provide a scrap preheater and an electric furnace capable of maximizing the utilization of exhaust gas sensible heat.

An object of the present invention is to provide a scrap preheater and an electric furnace capable of preventing exhaust gas from flowing out to the outside when scrap is introduced.

It is an object of the present invention to provide a scrap preheater and an electric furnace which are capable of a long residence time of scrap and are capable of continuous preheating and continuous introduction.

The problems to be solved by the present invention are not limited thereto, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a plasma processing apparatus comprising: a cylindrical preheating chamber arranged horizontally; Wherein the preheating chamber includes a plurality of preheating zones arranged radially about the central axis of the preheating chamber and storing scrap to preheat scrap by hot exhaust gas discharged from the furnace body, And a moving unit for moving the scrap so that the scrap is sequentially moved along the plurality of preheating zones.

In addition, the scrap preheater may further include a duct unit for providing the gas movement path so that the exhaust gas sequentially passes through the plurality of preheating zones and the scrap stored in each preheating zone is preheated.

In addition, the plurality of preheating zones may be connected to an inlet formed above the circumferential surface of the preheating chamber. A discharge preheating zone connected to a discharge port formed below the circumferential surface of the preheating chamber; And intermediate preheat zones disposed between the input preheat zone and the exhaust preheat zone.

In addition, the scrap preheater further includes a duct unit for providing a path for moving the exhaust gas flowing into the preheating chamber, The duct portion may include gas flow ducts connecting the respective preheat zones to direct exhaust gases from the input preheat zone through the intermediate preheat zones to the exhaust preheat zone.

In addition, the gas flow ducts may be alternately installed on opposite sides of the preheating chamber so that the exhaust gases pass zigzag through each preheat zone.

The duct unit may include a first exhaust duct through which the exhaust gas flowing into the preheating zone flows out; And a second exhaust duct through which the exhaust gas flowing into the intermediate preheating zone adjacent to the input preheating zone escapes.

The duct unit may include a first opening / closing valve installed in the first exhaust duct; And a second on-off valve installed in the second exhaust duct; The exhaust gas may be exhausted through the second exhaust duct when the scrap is introduced into the input preheating zone.

The preheating chamber may further include a feeder installed at the outlet and guiding the scrap to the exhaust port of the furnace body through the outlet.

The preheating chamber may further include a guide roller installed at an upper end of the discharge opening and pressing the upper portion of the scrap.

The scrap preheater may further include an auxiliary burner installed in the preheating chamber.

According to an aspect of the present invention, there is provided a furnace comprising: a furnace body having a cylindrical container for accommodating scrap to be melted and a container cover covering the top of the container; And a plurality of preheating units installed in the upper portion of the furnace body for storing scrap to be supplied to the furnace body and for preheating scrap before the hot exhaust gas discharged from the furnace body flows into the furnace body, A cylindrical preheating chamber in which the zones are provided radially about a horizontal central axis; And a moving unit installed in the preheating chamber and moving the scrap so that the scrap is sequentially moved along the plurality of preheating zones; The plurality of preheating zones may include an input preheating zone connected to an inlet through which the scrap is injected, a discharge preheating zone connected to an outlet through which the scrap preheated into the furnace body is discharged, and a discharge preheating zone disposed between the input preheating zone and the discharge preheating zone. It is desirable to provide an electric furnace including at least one intermediate preheating zone.

Further, the moving unit may include: a rotating shaft installed horizontally on a central axis of the preheating chamber; And moving plates radially disposed around the rotating shaft and rotated.

And a duct section for providing the gas movement path so that the exhaust gas sequentially passes through the plurality of preheating zones and preheats the scrap stored in each of the preheating zones; The duct portion may include gas flow ducts connecting the respective preheat zones to direct exhaust gases from the input preheat zone through the intermediate preheat zones to the exhaust preheat zone.

In addition, the gas flow ducts may be alternately installed on opposite sides of the preheating chamber so that the exhaust gases pass zigzag through each preheat zone.

The duct unit may include a first exhaust duct through which the exhaust gas flowing into the preheating zone flows out; A second exhaust duct through which the exhaust gas flowing into the intermediate preheating zone adjacent to the input preheating zone escapes; A first opening / closing valve installed in the first exhaust duct; And a second on-off valve installed in the second exhaust duct; The exhaust gas may be exhausted through the second exhaust duct when the scrap is introduced into the input preheating zone.

The preheating chamber is installed in the outlet and guides the scrap to the exhaust port of the furnace body through the outlet. And a guide roller installed at the upper end of the discharge port and pressing the upper part of the scrap.

According to the embodiment of the present invention, the scrap is supplied and preheated by a step-by-step method, so that the residence time of the scrap is long, so that the utilization of the exhaust gas sensible heat can be maximized.

According to the embodiment of the present invention, it is possible to prevent the exhaust gas from flowing out to the outside during the scrap injection, and have a special effect that the scrap can be preheated in the preheating zone other than the preheating zone into which the scrap is injected.

1 is a perspective view illustrating an electric arc furnace according to the present invention.
2 is a plan view of the electric arc shown in Fig.
3 is a side view of the electric arc shown in Fig.
4 is an exploded perspective view illustrating the scrap preheater shown in FIG.
5 is a side cross-sectional view of the scrap preheater.
6 is a plan view of the scrap preheater.
7A is a right side view of the scrap preheater.
7B is a left side view of the scrap preheater.
8 and 9 are views for explaining an exhaust gas flow in the scrap preheater.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout the specification and claims. The description will be omitted.

(Example)

FIG. 1 is a perspective view for explaining an electric arc according to the present invention, FIG. 2 is a plan view of the electric arc shown in FIG. 1, and FIG. 3 is a side view of the electric arc shown in FIG.

An electric arc furnace according to an embodiment of the present invention is an apparatus for manufacturing steel by dissolving and refining scrap by arc (ARC) heat generated between an electrode and an iron scrap (hereinafter referred to as " scrap " to be.

1 to 3, an electric arc furnace 10 includes a furnace body 100, a scrap preheater 20, and an exhaust unit 500.

The body 100 includes a cylindrical container 110 for receiving the scrap S to be melted and a container cover 120 for closing the open top of the container 110. [

The container cover 120 may be provided in a water-cooled manner, and three electrodes 130 are installed vertically through the center of the container cover 120 for a melting process. The electrode 130 may move up and down in the furnace body 10 and the electrode 130 may be connected to a three phase AC power source.

Although not shown, a sealing material is attached to the periphery of the container cover and the periphery of the electrode to eliminate the clearance and prevent air from entering the main body 100 from the outside. Although not shown, the vessel 110 may be provided with a slag discharge port for discharging the slag and a molten steel discharge port for discharging the molten steel.

The main body 100 is provided with an exhaust port 140 through which exhaust gas is exhausted to a position displaced from the center of the container cover 120 and scrap S preheated by the scrap preheater 20 is introduced. An exhaust port of the scrap preheater 20 is connected to the exhaust port 140.

The exhaust gas generated in the main body 100 passes through the scrap preheater 20 connected to the exhaust port 140 by the suction force provided by the exhaust part 500 and preheats the scrap S, And is exhausted to the outside. The exhaust unit 500 may include a suction fan 510, a dust collector 520, and the like.

4 and 5 are an exploded perspective view and side sectional view for explaining the scrap preheating apparatus shown in Fig. 1, Fig. 6 is a plan view of the scrap preheating apparatus, and Figs. 7a and 7b show the scrap preheating apparatus, Respectively.

4 to 7B, the scrap preheater 20 includes a preheating chamber 200, a moving unit 300, and a duct unit 400.

The preheating chamber 200 may be provided with an internal space in which the scrap S is stored in a generally cylindrical shape having an overall shape having a circumferential surface 202 and both side surfaces 204 and 206). The preheating chamber 200 may include a plurality of preheating zones for preheating scrap using hot exhaust gas discharged from the furnace body 100. The plurality of preheat zones may include an input preheat zone 212, an exhaust preheat zone 218, and at least one intermediate preheat zone 214, 216. For example, if five entire preheat zones are provided at 75 degree equidistant intervals, three intermediate preheat zones are provided.

The scrap preheater 20 may further include an auxiliary burner 800. The auxiliary burner 800 may be installed on one side of the preheating chamber 200 toward the preheating zone as in FIG. 7A. The auxiliary burner 800 is provided for ensuring chemical thermal energy by burning Co, H, etc. of the exhaust gas when scrap preheating is insufficient only by sensible heat of the exhaust gas.

In this embodiment, the preheating chamber 200 having four preheating zones 212, 214, 216, and 218 will be described as an example. For example, when viewed from the side, the preheating chamber 200 has a preheating zone 212 in the range of 270 degrees to 0 degrees, a first intermediate preheating zone 214 in the range of 0 degrees to 90 degrees, A second intermediate preheating zone 216 and a range of 180 to 270 degrees may be provided in the exhaust preheating zone 218.

The preheating zone 212 is connected to the inlet 210 formed at the upper end of the circumferential surface of the preheating chamber 200. The exhaust preheating zone 218 is connected to the exhaust port 220 formed at the lower end of the circumferential surface of the preheating chamber 200 and the exhaust port 220 can be connected to the exhaust port 140 of the furnace body 100. A feeder 240 may be installed between the outlet 220 and the exhaust port 140 since the exhaust port 140 is not positioned below the outlet 220 in a positional manner. The feeder 240 is a structure that connects the exhaust port 220 and the exhaust port 140 to guide and supply the scrap S to the exhaust port 140. In addition, the feeder 240 may include a vibrating device to facilitate scrap supply. However, if the exhaust port 140 is located below the outlet 220, the feeder may be omitted.

Meanwhile, a guide roller 250 may be installed on the scrap movement path between the discharge port 220 and the exhaust port 140 for improving scrap transfer. The guide roller 250 may serve to press the upper portion of the scrap S which is moved to the exhaust port 140 via the feeder 240.

The first intermediate preheating zone 214 and the second intermediate preheating zone 216 are disposed between the input preheating zone 212 and the exhaust preheating zone 218. That is, the two intermediate preheating zones 214 and 216 and the exhaust preheating zone 218 are arranged in a clockwise direction on the concentric circle when viewed from the side, based on the input preheating zone 212.

At the upper end of the circumferential surface of the preheating chamber 200, a charging port cover 290 for opening and closing the charging port 210 is provided. The preheating chamber (200) includes exhaust ports (208) through which the exhaust gas passing through the preheating zones is exhausted.

Exhaust ports 208 are provided on both sides 204, 206 of the preheating chamber 200. One exhaust port is provided only on the right side surface 206 of the preheating chamber 100 corresponding to the exhaust preheating zone 218 and one exhaust port 208 is provided on each of the opposite side surfaces 204 and 206 of the preheat chamber 200 corresponding to the remaining preheat zone Is formed. A duct portion 400 is connected to each exhaust port 208.

The duct part 400 provides a gas movement path so that the exhaust gas is sequentially passed through the plurality of preheating zones 212, 214, 216 and 218 and the scrap stored in each preheating zone is preheated.

The duct portion 400 may include gas flow ducts 410, 420, and 430, a first exhaust duct 440, and a second exhaust duct 450. Each of the ducts is connected to the exhaust port 208 formed in the preheating chamber 200, respectively.

7A and 7B, the gas flow ducts 410, 420, and 430 connect the respective preheat zones to guide the exhaust gas from the input preheating zone 212 through the intermediate preheat zones 214 and 216 to the exhaust preheat zone 218 . The gas flow ducts 410, 420 and 430 have a first gas flow duct 410 connecting the exhaust preheat zone 218 and the second intermediate preheat zone 216, a second intermediate preheat zone 216 and a first intermediate preheat zone 214, And a third gas flow duct 430 connecting the first intermediate preheating zone 214 and the input preheating zone 212. The gas flow ducts 410, The first gas flow duct 410 and the third gas flow duct 430 may be alternately disposed on opposite sides 204 and 206 of the preheating chamber 200 so that the gases pass zigzag through the respective preheat zones. May be provided on the right side surface 206 of the preheating chamber 200 and the second gas flow duct 420 may be provided on the left side surface 204 of the preheating chamber 200.

The first pre-heating zone (212) is provided with a first exhaust duct (440). The first exhaust duct 440 is provided on the side opposite to the third gas flow duct 430 (the left side 204 of the preheating chamber). The first exhaust duct 440 guides the exhaust gas flowing into the input preheating zone 212 through the third gas flow duct 430 to the exhaust unit 500 (shown in FIG. 1).

The second intermediate preheating zone 214 is provided with a second exhaust duct 450. The second exhaust duct 450 is provided on the side opposite to the second gas flow duct 420 (the right side of the preheating chamber 206). The second exhaust duct 450 guides the exhaust gas flowing into the second intermediate preheat zone 214 through the second gas flow duct 420 to the exhaust section 500.

The exhaust gas flowing into the preheating chamber 200 is exhausted through the second exhaust duct 450 in the second intermediate preheating zone 214 or exhausted through the first exhaust duct 440 in the preheating zone 212 And the exhaust gas is exhausted through the second exhaust duct 450 when the scrap S is introduced into the input preheating zone 212. [ A first opening and closing valve 442 is provided in the first exhaust duct 440 and a second opening and closing valve 452 is provided in the second exhaust duct 450 in order to change the exhaust path of the exhaust gas. The third gas flow duct 430 is provided with a third open / close valve 432.

For reference, cleaning exhaust for exhausting the exhaust gas remaining in the input preheating zone 212 can be performed before the inlet 210 of the input preheating zone 212 is opened. The cleaning exhaust can completely remove the residual exhaust gas in the input preheating zone 212 by opening the first opening / closing valve 442 provided in the first exhaust duct 440 and providing the exhaust pressure to the input preheating zone 212 .

The mobile unit 300 is installed in the preheating chamber 100. The mobile unit 300 sequentially moves the scrap S along the four preheating zones 212, 214, 216, and 218.

The mobile unit 300 may include a rotating shaft 310 and a plurality of moving plates 320. The number of the moving plates 320 can be changed according to the number of the preheating zones provided in the preheating chamber 100. In this embodiment, four preheating zones are provided, so that four movement plates can be provided.

The rotating shaft 310 is installed horizontally in the center of the preheating chamber 100. The rotary shaft 310 may be rotated by a driving unit (not shown) installed outside the preheating chamber 100. The moving plates 320 may be radially arranged at intervals of 90 degrees around the rotating shaft 310.

The moving plates 320 sequentially move the scrap S in a step-by-step manner through a rotating operation. That is, the scrap introduced into the input preheating zone 212 is moved to the first intermediate preheat zone 214 by one rotation operation of the mobile unit 300. Here, the single rotation operation of the mobile unit 300 may be 90 degrees.

8 and 9 are views for explaining an exhaust gas flow in the scrap preheater. FIGS. 8 and 9 are diagrams showing four preheating zones 212, 214, 216, and 218 laid out in a row for convenience of explanation.

8 shows the scrap preheating process in a state where the scrap is completely put into the input preheating zone 212. The exhaust gas is discharged through the discharge port 204 in the discharge preheating zone 202 in a state where the inlet 202 is closed by the opening / closing cover 290, The second intermediate preheating zone 216 and the second intermediate gas preheating zone 214 are connected to the first gas preheating zone 218 and the second gas preheating zone 216. The first gas preheating zone 218, the first gas flow duct 410, the second intermediate preheating zone 216, The scrap that is filled in the second intermediate preheating zone 216, the first intermediate preheating zone 214 and the input preheating zone 212 is preheated by the exhaust gas . The exhaust gas moved to the input preheating zone 212 is guided to the exhaust unit 500 (shown in FIG. 1) through the first exhaust duct 440. The second opening / closing valve 452 of the second exhaust duct 450 is closed and the first opening / closing valve 442 of the first exhaust duct 440 is controlled to be opened.

9 shows the scrap preheating process in a state that the scrap is introduced into the input preheating zone 212. The exhaust gas is discharged through the discharge port 204 in the discharge preheating zone 218 To the first intermediate preheating zone 214. The first intermediate gas preheating zone 214 is connected to the first intermediate gas preheating zone 214. The first intermediate gas preheating zone 214 is connected to the first gas preheating zone 214,

The third open / close valve 432 of the third gas flow duct 430 connecting the first preheating zone 214 and the preheating zone 212 is shut off. The scrap filled in the second intermediate preheating zone 216 and the first intermediate preheating zone 214 is preheated by the exhaust gas even while the scrap is being introduced into the input preheating zone 212. [ The exhaust gas moved to the first intermediate preheating zone 214 is guided to the exhaust unit 500 through the second exhaust duct 450. The second opening / closing valve 452 of the second exhaust duct 450 is opened and the first opening / closing valve 442 of the first exhaust duct 440 is shut off. Therefore, when the scrap is introduced into the input preheating zone 212, the flow of exhaust gas into the input preheating zone 212 is blocked.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: the main body 20: scrap preheating device
200: preheating chamber 300: mobile unit
400: Duct part

Claims (16)

delete A scrap preheater comprising:
A cylindrical preheating chamber disposed horizontally;
Wherein the preheating chamber comprises a plurality of preheating zones arranged radially about a central axis of the preheating chamber and in which scrap is stored and scrap is preheated by hot exhaust gas discharged from the furnace body,
A moving unit installed inside the preheating chamber and moving the scrap so that the scrap is sequentially moved along the plurality of preheating zones;
The scrap preheater
Further comprising a duct portion for providing the gas movement path so that the exhaust gas sequentially passes through the plurality of preheating zones and preheats the scrap stored in the respective preheating zones. A scrap preheater comprising:
A cylindrical preheating chamber disposed horizontally;
Wherein the preheating chamber comprises a plurality of preheating zones arranged radially about a central axis of the preheating chamber and in which scrap is stored and scrap is preheated by hot exhaust gas discharged from the furnace body,
A moving unit installed inside the preheating chamber and moving the scrap so that the scrap is sequentially moved along the plurality of preheating zones;
The plurality of preheat zones
A preheating zone connected to an inlet formed above the circumferential surface of the preheating chamber;
A discharge preheating zone connected to a discharge port formed below the circumferential surface of the preheating chamber; And
And intermediate preheating zones disposed between said input preheating zone and said exhaust preheating zone. The method of claim 3,
The scrap preheater
Further comprising: a duct unit for providing a path for moving the exhaust gas flowing into the preheating chamber;
The duct portion
And gas flow ducts connecting the respective preheat zones to direct exhaust gases from the preheat zone to the exhaust preheat zone via the intermediate preheat zones. 5. The method of claim 4,
Wherein the gas flow ducts are alternately installed on opposite sides of the preheating chamber so that the exhaust gases pass zigzag through each preheat zone. 5. The method of claim 4,
The duct portion
A first exhaust duct through which the exhaust gas flowing into the input preheating zone escapes; And
And a second exhaust duct through which the exhaust gas flowing into the intermediate preheating zone adjacent to the input preheating zone escapes. The method according to claim 6,
The duct portion
A first opening / closing valve installed in the first exhaust duct; And
Further comprising: a second on-off valve installed in the second exhaust duct;
And exhaust gas is exhausted through the second exhaust duct when scrap is introduced into the input preheating zone. The method of claim 3,
The preheating chamber
And a feeder installed at the outlet and guiding the scrap to the exhaust port of the furnace body through the outlet. 9. The method of claim 8,
The preheating chamber
And a guide roller installed at an upper end of the discharge port and pressing the upper portion of the scrap. 3. The method of claim 2,
The scrap preheater
And an auxiliary burner installed in the preheating chamber. In the electric furnace:
A furnace body having a cylindrical container for receiving scrap to be melted and a container cover covering the top of the container; And
A plurality of preheating zones installed in the upper portion of the furnace body for storing scrap to be supplied to the furnace body and for preheating scrap before the hot exhaust gas discharged from the furnace body flows into the furnace body, A preheating chamber of a cylindrical shape, wherein the preheating chamber is provided radially about a horizontal central axis; And
A moving unit installed in the preheating chamber and moving the scrap so that the scrap is sequentially moved along the plurality of preheating zones;
The plurality of preheat zones
A discharge preheating zone connected to a discharge port through which the scrap preheated into the furnace body is discharged, and at least one intermediate preheating zone disposed between the discharge preheating zone and the discharge preheating zone, Included electric furnace. 12. The method of claim 11,
The mobile unit
A rotary shaft installed horizontally on a central axis of the preheating chamber; And
And moving plates arranged in a radial direction about the rotation axis and rotated. 12. The method of claim 11,
Further comprising: a duct section for providing the gas movement path so that the exhaust gas sequentially passes through the plurality of preheating zones and preheats the scrap stored in the respective preheating zones;
The duct portion
And gas flow ducts connecting the respective preheat zones so as to guide the exhaust gas from the preheat zone to the exhaust preheat zone via the intermediate preheat zones. 14. The method of claim 13,
Wherein the gas flow ducts are alternately installed on opposite sides of the preheating chamber so that the exhaust gases pass zigzag through each preheat zone. 14. The method of claim 13,
The duct portion
A first exhaust duct through which the exhaust gas flowing into the input preheating zone escapes;
A second exhaust duct through which the exhaust gas flowing into the intermediate preheating zone adjacent to the input preheating zone escapes;
A first opening / closing valve installed in the first exhaust duct; And
Further comprising: a second on-off valve installed in the second exhaust duct;
And exhaust gas is exhausted through the second exhaust duct when scrap is introduced into the input preheating zone. 14. The method of claim 13,
The preheating chamber
A feeder installed at the outlet and guiding the scrap to the exhaust port of the furnace body through the outlet; And
And a guide roller installed at an upper end of the discharge port and pressing the upper portion of the scrap.

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