KR102075209B1 - Apparatus for preheating object treatment - Google Patents

Abstract

The present invention preferably, the preheating body portion via the exhaust gas discharged from the heat source facility; A to-be-processed object storage part detachably coupled to the preheated body part and to which a to-be-processed object received by exhaust gas passing through the preheated body part is preheated; And an ignition unit installed inside the preheating main unit to ignite at least the exhaust gas.

Description

Preheating device to be treated {APPARATUS FOR PREHEATING OBJECT TREATMENT}

The present invention relates to a workpiece preheating device with reduced cost.

It should be noted that the content described in this section merely provides background information on the present invention and does not constitute a prior art.

In general, the converter process of a steel mill to refine molten iron into molten steel is composed of a process of charging scrap and molten iron into a converter to inject a certain amount of pure oxygen to refine molten iron into molten steel.

In the converter refining process, the scraps charged into the converter are usually stored in the scrap yard in a scrap chute and transported to the scrap suit waiting area of the steelmaking factory to wait for the next charging of the converter in the smelting operation. The work will be charged into the converter.

A typical converter operation process takes the form of a 'shipping scrap scraper charging', in which a scrap, which is the main raw material of the converter, is charged to the converter first, and then the molten iron produced at the blast furnace is charged later.

In general, when smelting molten steel in a converter, scrap is used to process a large amount of scrap generated in an integrated steelmaking process and to recover insufficient molten iron stock, and a ratio of molten iron and scrap is determined by setting a hot metal ratio (HMR) of an appropriate vessel. We decide and operate.

If the maintenance of blast furnaces is not easy and the capacity of the charter is temporarily not due to the increase in the amount of drawing, the amount of scrap will be increased.In addition, if the productivity is increased by increasing the capacity of the post-process and improving the equipment, In order to make up for the molten metal, HMR (Hot Metal Ratio) rate is lowered.

At this time, if the scrap use ratio is increased, the use ratio of the molten iron which is a relatively heat source is lowered, and the amount of heat required for smelting molten steel is insufficient while melting the low temperature scrap.

When the amount of heat required for smelting is insufficient, the oxygen introduced into the converter reacts with iron (Fe) in molten iron, in addition to carbon, to generate heat. When iron reacts, the yield of iron is lowered, and due to the reaction product iron oxide The problem of deterioration of the quality of molten steel will occur.

In order to suppress such a reaction, a heat source is supplemented by additionally adding a heat increasing agent such as silicon iron (FeSi) or silicon carbide having affinity for oxygen than iron.

However, since the cost per ton of the heat increasing agent is considerable, there is a problem that the manufacturing cost of molten steel may be excessively increased in the case of replenishment of heat through the heat increasing agent.

Therefore, there is an urgent need to develop a technology capable of minimizing the use of a heat increasing agent and securing the amount of heat required for the smelting process by increasing the use of scrap and preventing a partial temperature loss.

KR 10-2000-0041675 A

The present invention is to provide a workpiece preheating device that can reduce the manufacturing cost by securing the amount of heat required for preheating the workpiece by using the exhaust gas discharged from the heat source equipment.

As one aspect for achieving the above object, the present invention is a preheating body portion via the exhaust gas discharged from the heat source facility; A to-be-processed object storage part detachably coupled to the preheated body part and to which a to-be-processed object received by exhaust gas passing through the preheated body part is preheated; And an ignition portion installed inside the preheating body portion to ignite at least the exhaust gas. The preheating body portion includes a first coupling member in a circumferential direction at an open rear side, and a rear coupling plate of the to-be-processed object storage portion. It provides a workpiece preheating device having a second coupling member inserted and coupled to the first coupling member.

Preferably, the to-be-processed object storage part may preheat a to-be-processed object by the combination of the heat exchange method with the waste gas via the said preheating main body part, and the combustion method of waste gas by the said ignition part.

Preferably, a plurality of to-be-processed object storage units may be provided and may be installed to be replaced in the preheating unit.

Preferably, the to-be-processed object storage unit, chute means for storing the to-be-processed object, can be drawn into the preheating body portion; And a bogie means fastened to the preheating body part and movably supporting the mounted chute means.

As another aspect for achieving the above object, the present invention is a preheating body portion via the exhaust gas discharged from the heat source facility; A to-be-processed object storage part detachably coupled to the preheated body part and to which a to-be-processed object received by exhaust gas passing through the preheated body part is preheated; And an ignition unit installed inside the preheating main unit to ignite at least the exhaust gas, wherein the processing target storage unit includes: chute means for storing the processing target and being able to be drawn into the preheating main unit; And a bogie means fastened to the preheat main body part and movably supporting the mounted chute means, wherein the preheat main body part has a first rail member formed at a lower side thereof, and the bogie means has the first means. A second rail member slidably installed with the rail member is formed, and the sealing member disposed between the bogie means and the first rail member is pressed while the upper surface of the bogie means and the first rail member are in close proximity. Provided is a workpiece preheating device.

As another aspect for achieving the above object, the present invention is a preheating body portion via the exhaust gas discharged from the heat source facility; A to-be-processed object storage part detachably coupled to the preheated body part and to which a to-be-processed object received by exhaust gas passing through the preheated body part is preheated; And an ignition unit installed inside the preheating main unit to ignite at least the exhaust gas, wherein the processing target storage unit includes: chute means for storing the processing target and being able to be drawn into the preheating main unit; And a trolley means fastened to the preheating body part and movably supporting the mounted chute means, wherein the trolley means comprises: a trolley body with wheels formed therein; And a mounting body disposed above the balance body and to which the chute means is mounted, wherein the mounting body is provided to be elevated on the balance body.

As another aspect for achieving the above object, the present invention is a preheating body portion via the exhaust gas discharged from the heat source facility; A to-be-processed object storage unit detachably coupled to the preheated body part, and the to-be-processed object stored by the exhaust gas passing through the preheated body part to be preheated; And an ignition part installed inside the preheating main body part to ignite at least the exhaust gas, wherein the sealing member is brought into close proximity between a boundary surface of the preheating main body part and the processing object storage part disposed with a sealing member interposed therebetween. It provides a to-be-processed preheating apparatus further comprising; a height adjusting unit for sealing between the preheating body portion and the to-be-processed object storage unit.

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As another aspect to achieve the above object, the present invention is a preheating body portion via the exhaust gas discharged from the heat source facility; A to-be-processed object storage part detachably coupled to the preheated body part and to which a to-be-processed object received by exhaust gas passing through the preheated body part is preheated; And an ignition unit installed inside the preheating main unit to ignite at least the exhaust gas, wherein the preheating main unit is configured to preheat the scrap to be processed by using the exhaust gas discharged from the converter which is the heat source facility as a heat source. , The preheating main unit is discharged from the converter, the exhaust gas of 200 ~ 400 degrees (° C.) is introduced through the dust collector, the ignition unit is heated to a temperature of 600 degrees (° C.) or more to reach the ignition temperature of the exhaust gas It provides a workpiece preheating device characterized in that to burn the exhaust gas.

According to an embodiment of the present invention as described above, by utilizing the exhaust gas discharged from the heat source equipment there is an effect that can reduce the manufacturing cost by securing the amount of heat required for preheating the workpiece.

1 is a view showing an example in which the workpiece preheating apparatus of the present invention is applied.
2 is a view showing a state before coupling between the components of the workpiece preheating apparatus according to an embodiment of the present invention.
3 is a view illustrating a state in which the components of the workpiece preheating apparatus of FIG. 2 are coupled;
4 is a view illustrating a state in which a preheating main body part and a to-be-processed object storage unit which are components of an object to be processed preheating apparatus of the present invention are combined.
5A is a diagram illustrating a preheating main part of a workpiece preheating apparatus of the present invention.
5B is a cross-sectional view taken along the AA ′ direction of FIG. 5A.
6A is a plan view of the chute means of a to-be-processed object storage unit which is a component of a to-be-processed object preheating apparatus of the present invention.
6B is a side view of the chute means of the to-be-processed object storage unit which is a component of the to-be-processed object preheating apparatus of the present invention.
FIG. 7A is a view illustrating an insertion state of the preheat main body and the object storage unit. FIG.
7B is a view showing a state in which the preheating body portion and the object to be processed are sealed.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Shapes and sizes of elements in the drawings may be exaggerated for clarity.

Hereinafter, a workpiece preheating apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 7B, the workpiece preheating apparatus according to an embodiment of the present invention includes a preheating body part 100, a workpiece storage part 200, and an ignition part 300. It may include a height adjustment unit (400).

2 and 3, the workpiece preheating device is detachably coupled to the preheating body part 100 through which the exhaust gas discharged from the heat source facility 1 passes, and the preheating body part 100, The to-be-processed object storage part 200 in which the to-be-processed object S accommodated by the exhaust gas via the preheating body part 100 is preheated, and installed in the preheated body part 100 to ignite at least the exhaust gas. It may include an ignition unit (300).

1 and 2, the preheating body portion 100 is a portion through which the high temperature exhaust gas discharged from the heat source equipment 1 such as a converter passes through.

3 and 4, the preheating body part 100 may have an inner space in which the chute means 210 of the object storage part 200 is accommodated.

FIG. 5A is a view illustrating a preheating main part of a workpiece preheating apparatus of the present invention, and FIG. 5B is a cross-sectional view taken along the line AA ′ of FIG. 5A.

5A and 5B, the preheating main body 100 includes an inlet line 110 through which exhaust gas discharged from a heat source facility 1 such as a converter is introduced, and a discharge line through which exhaust gas used for preheating is discharged ( 130).

1 and 5B, an inlet line 110 is formed at one side of the preheating body unit 100 and connected to an inlet pipe through which the exhaust gas discharged from the converter flows, and on the other side of the preheating body unit 100. A discharge line 130 for discharging the exhaust gas preheating the object S is formed, and the discharge line 130 may be connected to the withdrawal pipe 9 connected to the chimney from which the exhaust gas is finally discharged.

Referring to FIG. 1, the exhaust gas guided to the chimney 5 is sent to the preheating main body 100 using the cup valve body 6, and the scrap S which is waiting to be charged into the converter after the converter blows is loaded. The treatment storage unit 200 may be preheated by the exhaust gas.

The inlet line 110 of the preheating body unit 100 may be connected to the inlet pipe 7 through which the exhaust gas discharged from the heat source facility 1 moves.

The discharge line 130 of the preheating body part 100 may be connected to the withdrawal pipe 9 through which the exhaust gas is discharged, and the withdrawal pipe 9 may be connected with the chimney 5 through which the exhaust gas is finally discharged.

At this time, the waste flue gas passing through the preheating body part 100 may be discharged to the chimney 5 by the blower 8.

Referring to FIG. 1, the to-be-processed object storage unit 200 is a part in which the to-be-processed object S is stored and preheated the to-be-processed object S received by the exhaust gas passing through the preheating main body part 100. .

The processing target storage unit 200 may be preheated by placing the processing target S into the preheating main body 100 and disposing the processing target S on a path through which the exhaust gas moves.

The treatment object storage part 200 may be detachably installed in the preheating body part 100.

5A and 5B, the ignition unit 300 may be installed inside the preheating main unit 100 to ignite at least the exhaust gas.

That is, the main purpose of the ignition unit 300 is to use the combustion energy of the exhaust gas by igniting the exhaust gas via the preheating body unit 100.

Of course, the ignition unit 300 may of course burn other materials contained in the workpiece S other than the exhaust gas.

The ignition unit 300 may be connected to the inlet pipe 7 of the preheating body unit 100.

The ignition unit 300 may be provided as a flare burner disposed in the internal space of the preheating body unit 100.

At this time, the ignition unit 300 may be arranged in a plurality of flare burner inside the tapered chute is expanded in the direction away from the inlet pipe (7).

The to-be-processed object storage part 200 is a to-be-processed object S by the combination of the heat exchange system with the waste gas via the preheating main-body part 100, and the combustion method of the waste gas complexed by the said ignition part 300 (S). ) Can be preheated.

The workpiece preheating apparatus of the present invention can preheat the workpiece S by the heat exchange method with the exhaust gas passing through the preheating main body part 100 and the combustion method of the exhaust gas.

That is, the to-be-processed object storage part 200 preheats the to-be-processed object S by heat exchange with the flue gas which passes through the preheating main body part 100, and the combustion energy of the flue gas complexed by the ignition part 300 By preheating the object S by the preheating of the object S by the superposition method by a combination of a heat exchange method and a combustion method, the preheating efficiency of the object S can be improved. have..

In addition, as the to-be-processed material is dried during the preheating process, there is an effect of preventing the explosion risk that may occur when the molten iron meets the moisture during the converter operation.

1 and 2, the object to be processed 200 may be provided in plural, and may be installed in the preheating main body 100 in a replaceable manner.

When any one of the to-be-processed object storage part 200 is inserted into the preheated body part 100 and preheating of the stored to-be-processed object S is completed, the preheated to-be-processed object storage part 200 is preheated to the main body part 100. ), And the other processing object storage unit 200 may be introduced into the preheating body unit 100 to continuously preheat the processing object S.

3 and 4, the to-be-processed object storage unit 200 includes a chute unit 210 capable of storing the to-be-processed object S, which can be drawn into the preheated main body part 100, and the preheated main body. It may be provided with a bogie means 230 that is fastened to the part 100 and supports the mounted chute means 210 to be movable.

The chute means 210 is a portion in which the object S is stored.

For example, in the chute means 210, the scrap (S) is stored in the yard, and the workpiece storage unit 200 mounted on the bogie means 230 on which the chute means 210 is preheated main body part 100. Can be transported around.

As the flare burner of the ignition unit 300 is introduced into the chute means 210, the flame can be sprayed in the direction of the workpiece S loaded on the chute means 210. The flue gas passing through can be ignited.

6A and 6B, the chute means 210 may be drawn into the preheating body part 100, and the tip portion of the ignition part 300 may be drawn into the chute means 210.

In this case, the refractory 211 is coated inside the chute means 210, so that the chute means 210 may not be damaged by the flame when the flue gas stored by the play burner 310 of the ignition part 300 is ignited. .

At this time, the refractory (not shown) is also coated inside the preheating body part 100 so that the chute means 210 may not be damaged by the flame when the exhaust gas is ignited by the play burner 310 of the ignition part 300. .

The bogie means 230 may mount the chute means 210 in which the scrap S, which is the workpiece S, is stored by the crane, and the bogie means 230 places the chute means 210 on the upper surface. In the middle of the wheel can also move.

The bogie means 230 may move in the direction of the preheat main body 100 to be fastened with the preheat main body 100.

Referring to FIG. 4, a first rail member 150 is formed at a lower side of the preheating body part 100, and a second rail slidably installed with the first rail member 150 at the bogie means 230. A member 250 is formed, and the upper surface of the cart means 230 and the first rail member 150 are in close proximity, a sealing disposed between the cart means 230 and the first rail member 150. Member 500 may be pressed.

The sealing member 500 is disposed between the bogie means 230 and the first rail member 150, and the sealing member (while the boundary surface of the bogie means 230 and the first rail member 150 is close to each other is provided. As the 500 is pressed, a gap between the upper surface of the cart means 230 and the first rail member 150 may be sealed.

Referring to FIGS. 7A and 7B, the trolley unit 230 is disposed on a trolley main body 231 on which a wheel is formed, and on the upper side of the trolley main body 231, and the chute means 210 is mounted thereon. The main body 233 is provided, and the mounting body 233 may be installed to be elevated on the balance body 231.

The height adjusting part 400 is installed between the balance body 231 and the mounting body 233, and the mounting body 233 may be moved upward and downward on the balance body 231.

Height adjustment unit 400 may be provided with a cylinder member formed on the balance means (230).

The cylinder member is embedded in the balance body 231, and the mounting body 233 can be moved up and down while the rod of the cylinder member is moved.

Accordingly, while the upper surface of the mounting body 233 presses the sealing member 500 provided between the first rail member 150 of the preheating body portion 100, the upper surface of the mounting body 233 and the first rail member The lower surface of the 150 may be sealed.

Accordingly, the preheating body part 100 and the processing object storage part 200 may be sealed.

The workpiece preheating apparatus of the present invention is to close the sealing member 500 to the interface between the preheating body portion 100 and the workpiece storage portion 200 disposed with the sealing member 500 therebetween. It may further include a height adjusting unit 400 for sealing between the preheating body unit 100 and the processing object storage unit 200 by a medium.

The sealing member 500 may be disposed between the preheat main body 100 and the object storage 200.

The sealing member 500 may be installed on any one side of the preheating main body 100 and the object to be processed 200, and may seal the both.

The height adjusting part 400 is the sealing member 500 is pressed between the preheating main body 100 and the object storage 200, the close contact between the preheating body 100 and the object storage 200. At least one side of the preheating body part 100 and the to-be-processed object storage part 200 may be moved to make it possible.

For example, referring to FIGS. 7A and 7B, the sealing member 500 may include a top surface of the first rail member 150 of the preheating body part 100 and the mounting body 233 of the object storage part 200. It can be placed in between.

At this time, while the mounting body 233 is moved in the direction of the first rail member 150 by the height adjusting unit 400, the mounting body 233 and the first rail member 150 may be in close proximity.

Accordingly, the sealing member 500 may be sealed between the upper surface of the mounting body 233 and the first rail member 150 while being pressed by the mounting body 233 and the first rail member 150.

Accordingly, the preheating main body 100 and the object to be processed 200 may be sealed by the sealing member 500.

2 and 3, the preheating body part 100 includes a first coupling member 170 in the circumferential direction at an open rear side, and a rear coupling plate 290 of the object storage part 200. ) May be provided with a second coupling member 270 inserted into and coupled to the first coupling member 170.

The preheating main body 100 may be rearwardly opened, and a first coupling member 170 may be formed in a circumferential direction of the rear, and a first rail member 150 may be formed at a lower side thereof.

The second rail member 250 slidably installed with the first rail member 150 is formed in the cart means 230 of the workpiece storage 200, and the rear coupling plate 290 of the workpiece storage is formed. ), A second coupling member 270 inserted into and coupled to the first coupling member 170 may be formed.

Referring to FIG. 1, the preheating body unit 100 may be configured to preheat the scrap S, which is the object S, using the exhaust gas discharged from the converter which is the heat source facility 1 as a heat source.

At this time, the preheating body unit 100, the exhaust gas of less than the ignition temperature (° C) discharged from the converter flows in, the ignition unit 300, by heating the exhaust gas at a temperature or more than the ignition temperature (℃) of the exhaust gas. Can burn.

The converter process of the steelmaking plant to refine molten iron into molten steel consists of a process of refining molten iron into molten steel by injecting a certain amount of pure oxygen through the upper lance and the lower portion of the converter using scrap (S) and molten iron as raw materials.

In the conventional case, the scrap S charged into the converter is transported from the yard to the scrap chute at the steelmaking plant and to the scrap chute waiting area, and typically two scrap S suits are used to convert the scrap S to the converter operation. When the smelting process of one charge in the converter is completed, the scrap chute is transported to the converter by the overhead crane from the Scrap Stand (S) for the next charge operation. It was then refined.

The workpiece preheating apparatus of the present invention may preheat the scrap S, which is the workpiece S that is waiting for the converter refining, using the hot exhaust gas generated in the converter.

The workpiece preheating apparatus of the present invention may preheat the scrap S, which is the workpiece S, by utilizing a low concentration exhaust gas of 200 degrees (° C.) generated in the first 10 minutes of the converter blow.

Of course, the first 1450 degrees (℃) flue gas in the converter is lowered to about 200 degrees (℃) in the course of the two dust collectors, but still contains a lot of heat, so that the waste gas to be treated (S ) Can be sufficiently preheated.

In addition, in the case of high concentration flue gas (for example, CO gas) generated in the last 10 minutes during the converter drilling, the exhaust gas may not be stored due to capacity problems such as a holder, and thus all flue gas may not be collected. Is released into the atmosphere.

In the case of the present invention, the high concentration exhaust gas discharged without being stored due to the holder capacity problem in the last 10 minutes during the converter blow-in of the preheating main body 100 through the inlet pipe 7 before exiting the chimney (5) (110) Can be delivered.

That is, in the preheating device to be treated of the present invention, the ignition unit 300 heats and burns the exhaust gas having a high concentration to a temperature higher than the ignition temperature, so that the exhaust gas that is conventionally guided to the chimney 5 and ignited and discharged from the chimney 5 is discharged. By preheating the workpiece S by utilizing the heat of combustion, the amount of heat required for preheating the workpiece S is secured, thereby reducing the manufacturing cost.

Of course, the low concentration flue gas described above may also preheat the workpiece S by utilizing the combustion heat complexed by the ignition unit 300.

In one example, the preheating body portion 100, the exhaust gas of 200 ~ 400 degrees (° C.) discharged from the converter is introduced, the ignition unit 300, 600 degrees to reach the ignition temperature of the scrap (S). The workpiece S may be heated to a temperature of (° C.) or higher to burn the combustion material contained in the workpiece S.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and variations can be made without departing from the technical spirit of the present invention described in the claims. It will be obvious to those of ordinary skill in the field.

1: heat source equipment 3: dust collection equipment
5: chimney 6: cup valve body
7: incoming piping 8: blower
9: exhaust pipe 100: preheat main body
110: inlet line 130: discharge line
150: first rail member 170: first coupling member
200: object to be processed 210: chute means
230: vehicle balance 231: vehicle body
233: mounting body 250: second rail member
270: second coupling member 290: rear coupling plate
300: wearer 310: play burner
400: height adjustment unit 500: sealing member
S: To-be-treated, scrap

Claims (10)

A preheating body part passing through the exhaust gas discharged from the heat source facility;
A to-be-processed object storage part detachably coupled to the preheated body part and to which a to-be-processed object received by exhaust gas passing through the preheated body part is preheated; And,
And an ignition unit installed inside the preheating unit to ignite at least the exhaust gas.
The preheating body portion is provided with a first coupling member in the circumferential direction in the open rear,
And a second coupling member inserted into and coupled to the first coupling member on the rear coupling plate of the workpiece storage portion.
The method of claim 1, wherein the object storage unit,
Heat exchange method with the exhaust gas via the preheating body portion,
A to-be-processed object preheating apparatus characterized by preheating a to-be-processed object by the combination of the combustion method of the off-gas complexed by the said ignition part.
The method of claim 1,
The to-be-processed object storage unit is provided with a plurality of to-be-processed object pre-installed to replace the pre-heated body portion.
The method of claim 1, wherein the object storage unit,
A chute means for storing an object to be processed and being retractable into the preheating body part; And,
And a bogie means fastened to the preheating body part and supporting the mounted chute means so as to be movable.
A preheating body part passing through the exhaust gas discharged from the heat source facility;
A to-be-processed object storage part detachably coupled to the preheated body part and to which a to-be-processed object received by exhaust gas passing through the preheated body part is preheated; And,
And an ignition unit installed inside the preheating unit to ignite at least the exhaust gas.
The processing object storage unit,
A chute means for storing an object to be processed and being retractable into the preheating body part; And,
And a bogie means fastened to the preheating body part and movably supporting the mounted chute means.
The preheat body portion is formed with a first rail member on the lower side,
The bogie means is provided with a second rail member slidably installed with the first rail member,
And a sealing member disposed between the bogie means and the first rail member while the upper surface of the bogie means is close to the first rail member.
A preheating body part passing through the exhaust gas discharged from the heat source facility;
A to-be-processed object storage unit detachably coupled to the preheated body part, and the to-be-processed object stored by the exhaust gas passing through the preheated body part to be preheated; And,
And an ignition unit installed inside the preheating unit to ignite at least the exhaust gas.
The processing object storage unit,
A chute means for storing an object to be processed and being retractable into the preheating body part; And,
And a bogie means fastened to the preheating body part and supporting the mounted chute means so as to be movable.
The loan means,
Balance body is formed wheel; And,
Is disposed on the upper side of the balance body, the mounting body is mounted on the chute means;
The mounting body is a workpiece preheating device which is installed to be elevated on the balance body.
A preheating body part passing through the exhaust gas discharged from the heat source facility;
A to-be-processed object storage part detachably coupled to the preheated body part and to which a to-be-processed object received by exhaust gas passing through the preheated body part is preheated; And,
And an ignition unit installed inside the preheating unit to ignite at least the exhaust gas.
A height adjusting unit which closes an interface between the preheating main body unit and the object storage unit disposed with a sealing member interposed therebetween, and seals the gap between the preheating body unit and the object storage unit through the sealing member; The preheating device to be processed further comprising.
delete delete A preheating body part passing through the exhaust gas discharged from the heat source facility;
A to-be-processed object storage part detachably coupled to the preheated body part and to which a to-be-processed object received by exhaust gas passing through the preheated body part is preheated; And,
And an ignition unit installed inside the preheating unit to ignite at least the exhaust gas.
The preheat body portion,
It is configured to preheat the scrap to be treated by using the exhaust gas discharged from the converter which is the heat source equipment as a heat source,
The preheat body portion,
The exhaust gas is discharged from the converter and the exhaust gas of 200 to 400 degrees (° C.) is introduced through the dust collecting equipment,
The ignition unit,
The preheating device to be treated, characterized in that for heating the exhaust gas by heating to a temperature of 600 ° C or more to reach the ignition temperature of the exhaust gas.

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