KR20060011330A - An apparatus for manufacturing compacted iron of reduced materials comprising fine direct reduced irons and an apparatus for manufacturing molten irons using the same - Google Patents

Abstract

The present invention relates to an apparatus for producing compacted iron containing reduced iron, and an apparatus for manufacturing molten iron using the same. To this end, the compacted article manufacturing apparatus of the present invention comprises a pair of rolls for compressing the reduced iron-containing reducing body to produce compacted compacts, roll casings wrapped around the pair of rolls, and rolls spaced apart from the rolls in the longitudinal direction of the rolls. And a scraper installed to connect the casing inner side to remove the compacted body attached to the roll surface. Through this invention, productivity can be improved by preventing a compact from adhering to a roll.

Roll, Scraper, Inclined Angle, Steel Making Machine, Compacted Material

Description

Device for manufacturing compacted iron containing reduced-ring iron and apparatus for manufacturing molten iron using same

1 is a schematic perspective view of a compacted article manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along line AA of FIG. 1.

3 is a schematic perspective view of a scraper according to an embodiment of the present invention.

4 is a view schematically showing a molten iron manufacturing apparatus including a compacted material manufacturing apparatus according to an embodiment of the present invention.

The present invention relates to a compacted material manufacturing apparatus and a molten iron manufacturing apparatus using the same, and more particularly, compacted material manufacturing apparatus for producing compacted material by compressing a reduced body containing direct reduced iron (DRI) and molten iron using the same It relates to a molten iron manufacturing apparatus for manufacturing a.                         

The steel industry is a key industry that supplies basic materials to the entire industry, such as automobiles, shipbuilding, home appliances, construction, etc., and is one of the oldest industries with the development of mankind. Steel mills, which play a pivotal role in the steel industry, use molten iron and coal as raw materials to produce molten pig iron, which is then manufactured and supplied to each customer.

Currently, about 60% of the world's iron production comes from the blast furnace method developed since the 14th century. The blast furnace method is a method of manufacturing molten iron by reducing iron ore to iron by putting together coke prepared from sintering process and coke made from bituminous coal into a blast furnace. The blast furnace method, which is a large scale of the molten iron production equipment, requires a raw material having a certain level or more of strength and a particle size capable of ensuring the breathability in the furnace due to its reaction characteristics. As described above, the blast furnace method is a carbon source used as a fuel and a reducing agent. Relies on coke processing specific raw coal, and iron sources mainly rely on sintered ore through a series of bulking processes. As a result, the current blast furnace method necessarily involves preliminary processing of raw materials such as coke manufacturing facilities and sintering facilities. Therefore, it is not only necessary to construct auxiliary facilities other than blast furnaces, but also Due to the need for the installation of environmental pollution prevention equipment, there is a problem in that the manufacturing cost is rapidly increased due to the large investment cost.

In order to solve the problems of the blast furnace method, molten reduction of molten iron is produced by directly using general coal as a fuel and a reducing agent in steel mills around the world, and by directly using spectroscopy that occupies 80% or more of the world's ore production as an iron source. Much effort has been put into developing the steelmaking method.

U.S. Patent No. 5,534,046 discloses an apparatus for manufacturing molten iron using direct coal and spectroscopy. The apparatus for manufacturing molten iron disclosed in U.S. Patent No. 5,534,046 consists of a three-stage flow reduction reactor in which a bubble fluidized bed is formed and a melt gasification furnace connected thereto. The spectroscopy and subsidiary materials at room temperature are charged to the first flow reduction reactor, followed by three flow reduction reactors in sequence. Since the high temperature reducing gas is supplied from the melt gasifier to the three-stage flow reduction furnace, the spectroscopic and secondary raw materials at room temperature are heated in contact with the high temperature reducing gas. At the same time, the spectroscopy and secondary raw materials at room temperature are reduced by 90% or more, fired by 30% or more, and charged into the melt gasifier.

Coal is supplied into the melt gasifier to form a coal filling layer, and spectroscopy and subsidiary materials at room temperature are melted and slaked in the coal filling layer and discharged into molten iron and slag. Oxygen is blown through a plurality of air vents installed on the outer wall by melting gasification, is converted into a high temperature reducing gas while combusting the coal packed bed, and is sent to a fluid reduction reactor to reduce spectroscopy and secondary raw materials at room temperature, and then are discharged to the outside.

However, in the above-described molten iron manufacturing apparatus, since a high-speed gas stream is formed in the upper part of the molten gasifier, there is a problem in that the branched iron and the secondary materials charged into the molten gasifier are scattered. In addition, when charging reduced iron and secondary raw materials into the molten gasifier, there is a problem that it is difficult to ensure the air permeability and liquidity of the coal filling layer in the molten gasifier.

In order to solve this problem, a method of briquetting reduced-reduced iron and subsidiary materials and charging them into a melt gasifier has been studied. In this regard, U.S. Patent No. 5,666,638 discloses a method and apparatus for producing elliptical sponge iron briquettes. In addition, U.S. Patent Nos. 4,093,455 and 4,076,520 disclose methods and apparatus for producing plate-shaped or corrugated irregular sponge iron briquettes. Here, the reduced-reduced iron is hot-hardened and cooled to be suitable for long-distance transportation to produce spongy iron briquettes.

However, in the case of pressing the briquettes in such a manner, when the charging amount of the reducing iron is increased in order to increase the production, some of the hot sponge iron briquettes formed are attached to the roll surface. Sponge briquettes attached to the surface of the roll proceeds to the top of the roll in accordance with the rotation of the roll is impinged on the barbed iron briquette manufacturing apparatus is pinched.

Accordingly, a failure occurs in the apparatus for producing sponge briquettes, and thus, the production of sponge briquettes must be stopped, and normal operation is impossible at the time of stopping.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and is intended to provide a compacted structure manufacturing apparatus having a simple structure that can be easily detached from the roll surface of a compacted body attached to the roll surface and wound on the roll as the roll rotates.

In addition, the present invention is to provide a molten iron manufacturing apparatus that can produce a good molten iron using a good quality compacted material.

The compacted material manufacturing apparatus according to the present invention comprises a pair of rolls for compressing the reducing iron-containing reducing body to produce compacted material, roll casings wrapped around the pair of rolls, and spaced apart from the rolls. And a scraper installed to connect the inner side of the roll casing in the longitudinal direction of the roll to remove the compacted body attached to the roll surface.

Moreover, it is preferable that a scraper is installed in the lower part of a roll.

And it is preferable that the 1st surface of the scraper which adjoins the peeled compacted body forms an acute angle with the 2nd surface of the scraper which opposes the surface of a roll.

Here, it is preferable that acute angle is 30 degrees-60 degrees.

In addition, the separation distance between the scraper and the roll may be equal to or less than the interval between the pair of rolls.

And the separation distance between the scraper and the roll may be 2mm to 4mm.

The molten iron manufacturing apparatus of the present invention includes a compacted body manufacturing apparatus having the above-described structure, a crusher for crushing the compacted body discharged from the compacted body manufacturing apparatus, and a melt gasifier for charging and melting the compacted material crushed in the crusher.

In addition, at least one coal selected from lump coal and coal briquettes may be supplied to the melting gasifier.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. These embodiments of the present invention are merely for illustrating the present invention and the present invention is not limited thereto.

1 is a schematic perspective view of an apparatus for producing a compact according to an embodiment of the present invention, which includes a charging hopper 10 and a pair of rolls 20 (including a gear attached to an end of the roll). The compacted-body manufacturing apparatus 100 is shown schematically. The structure of the compacted body manufacturing apparatus shown in FIG. 1 is only for illustration of this invention, Comprising: This invention is not limited to this. Therefore, the form of the compacted body manufacturing apparatus can be modified into various other structures.

Through the opening 16 located in the center of the charging hopper 10 shown in FIG. 1, the reducing body containing a ring reducing iron is charged in the direction shown by arrow A '. The reduced iron-containing reducing body is prepared from iron ore, and may further include an auxiliary material, and is reduced and manufactured through a multi-stage flow reduction furnace. You may charge into the charging hopper 10 the reduced-ring iron containing reducing body manufactured by other methods. An exhaust hole 14 is formed in an upper portion of the charging hopper 10 to remove the gas generated from the high-temperature reducing iron-containing reducing substance flowing into the charging hopper 10.

The charging hopper 10 includes a guide tube 70 that is inclined at an acute angle under the charging hopper 10. The guide tube 70 is fitted into the feeding box 30. The supply box 30 is installed in the lower portion of the charging hopper 10 to deliver the reduced iron-containing reducing body to the pair of rolls 20, and its center (shown in FIG. 2, hereinafter same) is charged hopper 10 It is formed to be inclined convexly toward. In this way, since the center is formed convexly and the lower space is formed convexly toward the charging hopper 10 side, it is possible to secure the retention layer of the reducing body including the direct reduced iron (DRI) flowing in a large amount, the screw By using the feeder 12 is delivered to the reduced iron-containing reducing body discharged to a pair of rolls 20 to be uniformly distributed along its length direction.

In the charging hopper 10, a screw feeder 12 is provided for discharging the reduced-iron-containing reducing substance flowing into the charging hopper 10 into a gap between the pair of rolls 20. The screw feeder 12 has a screw 122 (shown in FIG. 2) formed at a lower end thereof, thereby forcibly discharging the reduced-reduction iron-containing reducing agent collected at the lower portion thereof by rotation of a motor (not shown) attached to the upper side thereof. .

A pair of rolls 20 located in the roll casing 24 compresses the reduced-iron-containing reducing body discharged by the screw feeder 12 from the charging hopper 10 to produce compacted material. The pair of rolls 20 are spaced apart from each other to form a gap to produce a compact in the form of a strip. The roll cover 26 is attached to the outside of the roll 20. Hereinafter, the internal structure of the compacted body manufacturing apparatus according to an embodiment of the present invention will be described in more detail with reference to FIG. 2.

FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG. 1, and schematically illustrates the scrapers 90 respectively installed on the lower portions of the pair of rolls 20.

The pair of rolls 20 includes a roll core 202 and a roll tire 204 surrounding the roll core 204. The roll 20 is formed on the surface of the roll tire 204 by reducing iron-containing reducing agent discharged from the top by rotating in the direction of the arrow. Compress to cotton. In this case, since the extension line of the central axis of the screw feeder 12 passes through the gap B, the reduced-ring iron-containing reducing agent is charged in between the rolls 20 so that compression is well performed to produce a compact product having good quality. . Accordingly, the reducing iron-containing reducing body flowing into the pair of rolls 20 is smoothly charged into the center of the roll, and the amount thereof is substantially uniformly distributed along the length direction of the pair of rolls 20, thereby reducing the reducing iron. Can be supplied stably.                     

Here, the pair of rolls 20 is composed of a roll core 202 and a roll tire 204 surrounding the roll core 204, the reduced reduction iron-containing reducing material discharged from the upper by rotating in the direction of the arrow on the surface of the roll tire 204 Compress into the formed working surface. In this case, since the extension line of the central axis of the screw feeder 12 passes through the gap B ', the reduced-ring iron-containing reducing agent is well charged between the rolls 20, so that compression is well performed to produce a compact product having good quality. have.

When the compacted material thus formed adheres to the surface of the roll 20 and proceeds, the scraper 90 is provided below the roll 20 to remove the briquette 80 from the surface of the roll 20. The scraper 90 can be installed in the pair of rolls 20, respectively. The detached briquette 80 is discharged downward through the outlet 26 formed in the lower part of the briquette manufacturing apparatus. Since the scraper 90 is installed below the roll 20 as described above, the briquette 80 attached to the surface of the roll 20 can be immediately discharged through the outlet 26.

In the enlarged circle of FIG. 2, the cross-sectional structure of the scraper 90 is shown in greater detail. The scraper 90 shown in the enlarged circle of FIG. 2 is supported by the scraper support 92 attached to the inside of the roll casing 24. The scraper 90 includes a first side 901 and a second side 903. The first surface 901 is adjacent to the peeled compact and the second surface 903 faces the surface of the roll 20. Here, the first surface 901 and the second surface 903 form an acute angle α. The first surface 901 and the second surface 903 are formed to be inclined while forming an acute angle α, and a portion corresponding to the acute angle α protrudes sharply. Thereby, the compacted material adhered to the surface of the roll 20 is caught by the part corresponding to an acute angle (alpha), and is separated from the roll 20, and a compacted material can be easily peeled off.

Here, it is preferable that the acute angle (alpha) formed by the meeting of the 1st surface 901 and the 2nd surface 903 is 30 degrees-60 degrees. If the acute angle α is less than 30 °, the portion corresponding to the acute angle α of the scraper 90 protrudes too sharply, so that the compacted material 80 removed from the surface of the roll 20 is the first of the scraper 90. Adjacent to the horizontal near the surface 901, it may not be discharged to the lower portion of the compacted material manufacturing apparatus. On the contrary, if the acute angle α exceeds 60 °, the inclination angle may be dull and the compacted material 80 adhered to the surface of the roll 20 may not easily fall off.

On the other hand, as shown in the enlarged circle of FIG. 2, it is preferable that the separation distance d between the scraper 90 and the roll 20 is below the space | interval between a pair of roll 20. As shown in FIG. The scraper 90 is separated from the roll 20 to prevent friction with the roll 20 and at the same time adjusts the gap between the pair of rolls 20 to easily remove the compacted material attached to the roll 20. have.

Here, the scraper 90 is installed below the roll 20 so that the separation distance d is 2 mm to 4 mm. Since the scraper 90 is supported through the scraper support 92, the separation distance d may be adjusted by adjusting the height of the scraper support 92 attached to the roll casing 24. If the separation distance d is less than 2 mm, the distance from the roll 20 is too close, and the scraper 90 may come into contact with the roll 20 due to vibration during operation of the briquette manufacturing apparatus, and friction may occur. In addition, when the separation distance d exceeds 4 mm, the distance from the roll 20 is too long, and it is difficult to remove the compacted material 80 attached to the roll 20.

Hereinafter, the structure of the scraper will be described in more detail with reference to FIG. 3.

3 is a schematic perspective view of the scraper 90 according to an embodiment of the present invention, showing the scraper 90 installed to interconnect the inside of the roll casing 24 in the longitudinal direction of the roll 20. The form of the scraper 90 shown in FIG. 3 is merely for illustrating the present invention, but the present invention is not limited thereto. Therefore, the scraper 90 can be modified to another structure. In FIG. 3, the roll 20 and the roll casing 24 are shown in dashed lines for convenience. In addition, although the scraper 90 is actually provided in the form of a rectangular member, and it connects between the roll casings 24, in FIG. 3, the middle part is cut off for convenience.

As shown in FIG. 3, the scraper 90 is provided in the Y-axis direction which is the longitudinal direction of the roll 20. As shown in FIG. The scraper 90 is firmly fixed by fastening with a bolt 96 using a screw 94 on the scraper support 92. Alternatively, the scraper 90 may be fixed to the scraper support 92 by welding. Since the scraper 90 is firmly fixed to the scraper supporter 92 as described above, even if vibration occurs in the briquette manufacturing apparatus according to briquette production, the distance between the roll 20 and the roll 20 can be maintained continuously.

Hereinafter, a molten iron manufacturing apparatus using the compacted apparatus according to an embodiment of the present invention will be described in detail.

4 is a view schematically showing a molten iron manufacturing apparatus using a compacted material manufacturing apparatus according to an embodiment of the present invention, it shows a molten iron manufacturing apparatus for manufacturing molten iron by charging the compacted material into a melt gasifier.                     

The molten iron manufacturing apparatus 200 shown in FIG. 4 is a compacted material manufacturing apparatus 100 of the present invention, a crusher 40 for crushing the compacted material discharged from the compacted material manufacturing apparatus, and the compacted material crushed by the crusher 40 It includes a melt gasifier (60) to charge and melt. In addition, it may further include a reservoir 50 for temporarily storing the compacted material crushed by the crusher 40. The structure of the crusher 40 and the melt gasifier 60 will be easily understood by those skilled in the art to which the present invention pertains, and thus the detailed description thereof will be omitted.

The melt gasifier 60 is supplied with at least one coal selected from coal and coal briquettes. In general, the coal briquettes may be an example of coal having a particle size of more than 8 mm taken from the production site, and the coal briquettes may be coal formed by pressing by crushing coal having a particle size of 8 mm or less taken from the production site.

This kind of coal is charged into the melt gasifier 60 and oxygen (O ₂ ) is supplied to melt the compacted material and then discharge it to the hot water outlet. In this way, molten iron of good quality can be easily produced.

Since the compacted material manufacturing apparatus includes a scraper spaced apart from the roll and connected between the inner side of the roll casing in the longitudinal direction of the roll to detach the compacted material attached to the roll surface, the compacted material is continuously stopped from the compacted material manufacturing device. It can be discharged without the advantage that the productivity of the compacted material is greatly improved. And since the scraper is installed to connect the inside of the roll casing, it is possible to effectively prevent the briquette from being attached to the roll while installing the scraper relatively simply at a low cost.

And because the scraper is installed in the lower portion of the roll, there is an advantage that can be discharged directly to the lower portion of the briquette manufacturing apparatus attached to the roll through the scraper.

In addition, since the first surface of the scraper forms an acute angle with the second surface of the scraper, the briquettes attached to the surface of the roll can be easily dropped using the scraper.

Here, since the acute angle formed between the first surface of the scraper and the second surface of the scraper is 30 ° to 60 °, the briquettes can be more easily removed.

The separation distance between the scraper and the roll is less than or equal to the distance between the pair of rolls, and the briquettes attached to the roll surface can be easily detached while preventing contact between the roll surface and the scraper.

Since the separation distance between the scraper and the roll is 2mm to 4mm, it is easier to remove the briquettes attached to the roll surface.

Since the molten iron manufacturing apparatus of the present invention includes the compacted material manufacturing apparatus, the crusher, and the melt gasification furnace as described above, molten iron of good quality can be produced.

In addition, since at least one coal selected from the coal and coal briquettes is supplied to the melting gasifier, the finely divided coal collected at the production site can be used directly, thereby reducing production costs and having no environmental pollution.

Although the present invention has been described above, it will be readily understood by those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

Claims (8)

A pair of rolls for compressing the reducing iron-containing reducing body to produce compacted material, A roll casing wrapped around the pair of rolls, and A scraper spaced apart from the roll and installed to connect the inner side of the roll casing in the longitudinal direction of the roll to remove the compacted material attached to the roll surface. Compacted material manufacturing apparatus comprising a. In claim 1, The scraper is a compacted material manufacturing apparatus installed in the lower portion of the roll. In claim 2, The 1st surface of the said scraper which adjoins the said peeled compacted body forms an acute angle with the 2nd surface of the said scraper which opposes the surface of the said roll. In claim 3, The acute angle is 30 ° to 60 ° compacted material manufacturing apparatus. In claim 1, The spaced distance between the said scraper and the said roll is less than the space | interval between the said pair of rolls. In claim 5, Spacing distance between the scraper and the roll is a compact manufacturing apparatus of 2mm to 4mm. Apparatus for producing compacted material according to claim 1, Crusher for crushing the compacted material discharged from the compacted material manufacturing apparatus, And Melting gas furnace to charge and melt the compacted material crushed in the crusher Iron manufacturing apparatus comprising a. In claim 7, A molten iron manufacturing apparatus for supplying at least one of a lump coal and coal briquettes to the melting gasifier.

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