KR20070007502A - Apparatus for manufacturing compacted iron of reduced materials comprising fine direct reduced irons and apparatus for manufacturing molten irons using the same - Google Patents

Abstract

A compacted iron manufacturing equipment constructed in a simple structure capable of easily separating the compacted iron from the surfaces of the rolls when compacted iron adhered onto surfaces of rolls is wound around the rolls according to rotation of the rolls, and a molten iron manufacturing apparatus capable of manufacturing high quality molten iron using compacted iron of high quality are provided. An equipment for manufacturing compacted iron comprises: a pair of rolls for pressing reduced materials containing fine direct reduced ion to manufacture compacted iron; a roll casing for covering the periphery of a pair of the rolls; and scrapers(95) which are installed in such a manner that the scrapers are spaced from the rolls and connect inner ends of the roll casing in a length direction of the roll, and which separate compacted iron adhered onto surfaces of the rolls, wherein the scrapers comprise a plurality of scraper rolls(951) formed correspondingly to a pair of the rolls. The scrapers are installed on lower parts of a pair of the rolls. Each of the scraper rolls comprises scraper parts(9511) formed correspondingly to a pair of the rolls to separate compacted iron, and fixing parts(9513) for holding the scraper parts. The scrapers further comprise a shaft(953) formed in a length direction of the rolls to connect the inner ends of the roll casing, and a pair of fixing blocks(955) for fixing both ends of the shaft, wherein a plurality of the scraper rolls are installed on the shaft. The scrapers further comprise bushes(952) inserted between the scraper rolls and the shaft, cover members(956) for holding the scraper rolls and the bushes to prevent the scraper rolls and the bushes from being separated from the shaft, stoppers(957) for fixing the cover members to the shaft, and fixing members for fixing the fixing blocks to the roll casing.

Description

Apparatus for manufacturing compacted iron containing reduced iron, and apparatus for manufacturing molten iron having the 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.

FIG. 3 is a schematic exploded view of the scraper shown in FIG. 2.

4 is a schematic cross-sectional view showing a coupling state of the scraper shown in FIG.

5 is a view showing an operating state of the scraper.

6 is another view showing the operating state of the scraper.

7 is a view schematically showing a molten iron manufacturing apparatus having 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 increases rapidly 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. Many efforts are being made in the development of 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 subsidiary 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 reduced 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 provided to connect the inside of the roll casing in the longitudinal direction of the roll to remove the compacted body attached to the roll surface. The scraper includes a plurality of scraper rolls positioned corresponding to the pair of rolls.

The scraper may be installed at the bottom of the pair of rolls.

Each scraper roll may include the scraper part which corresponds to a pair of rolls, and removes a compacted body, and the fixing part which supports a scraper part.

It is preferable that the scraper parts of a scraper roll are mutually spaced apart.

The concave portion and the convex portion may be continuously formed on the outer circumference of the scraper portion.

It is preferable that many recesses are formed in the roll surface, and the recesses of the roll face the convex portions of the scraper portion.

The separation distance between the roll and the corresponding scraper is preferably 3 mm to 5 mm.

The scraper may further include a shaft for connecting the roll casing inner side in the longitudinal direction of the roll, and a pair of fixing blocks for fixing both ends of the shaft. Multiple scraper rolls can be installed on the shaft.

The scraper may include a shaft connecting the inside of the roll casing in the length direction of the roll, a plurality of scraper rolls provided on the shaft, and a pair of fixing blocks for fixing both ends of the shaft.

The scraper includes a bush inserted between the scraper roll and the shaft, a cover member for supporting the scraper roll and the bush so as not to fall off the shaft, a stopper for fixing the cover member to the shaft, and a fixing block to the roll casing. A fixing member may be further included.

The molten iron manufacturing apparatus according to the present invention includes the compacted material manufacturing apparatus described above, a crusher for crushing the compacted material discharged from the compacted material manufacturing apparatus, and a melt gasification furnace for charging and melting the compacted material crushed in the crusher.

In the apparatus for manufacturing molten iron according to the present invention, at least one of lump coal and coal briquettes may be supplied to a melting gasifier.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 7. These embodiments of the present invention are merely for illustrating the present invention and the present invention is not limited thereto.

1 shows a compacted material manufacturing apparatus 100 according to an embodiment of the present invention. The structure of the compacted body manufacturing apparatus 100 shown in FIG. 1 is only for illustration of this invention, Comprising: This invention is not limited to this. Therefore, the structure of the compacted material manufacturing apparatus 100 can be modified differently. The compact manufacturing apparatus 100 includes a charging hopper 10 and a pair of rolls 20 (including a gear attached to an end of the roll).

Through the opening 16 formed in the charging hopper 10, a reducing body containing a reduced iron is charged in the direction indicated by the arrow A '. The reduced reducing 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 inclined at an acute angle thereunder. 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. 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 illustrates an internal cross-sectional structure of the compacted material manufacturing apparatus 100 taken along line AA of FIG. 1. As shown in FIG. 2, the scraper 95 is provided in the lower part of the pair of rolls 20, and the compacted material adhered to the roll 20 surface is removed.

The pair of rolls 20 includes a roll core 202 and a roll tire 204 surrounding it. The pair of rolls 20 compresses the reduced-ring iron-containing reducing substance discharged from the upper portion by rotating in the direction of the arrow to the processed surface formed on the surface of the roll tire 204. In this case, since the extension line of the central axis of the screw feeder 12 passes through the gap G, the reduced-ring iron-containing reducing agent is charged in between the rolls 20, so that compression can be made well, thereby producing a compact product having good quality. . Therefore, the reducing iron-containing reducing body flowing into the pair of rolls 20 is smoothly charged into the center of the roll 20, and the amount thereof is substantially uniformly distributed along the length direction of the pair of rolls 20. It can supply stable reduced iron.

When the compacted compact thus formed adheres to the surface of the roll 20, the scraper 95 is provided below the roll 20 to remove the compacted body B from the surface of the roll 20. The scraper 95 can be installed in the pair of rolls 20, respectively. The compacted material B thus detached is discharged downward through the outlet 28 formed in the lower portion of the briquette manufacturing apparatus 100. Since the scraper 95 is installed below the roll 20 as described above, the compacted body B attached to the surface of the roll 20 can be immediately discharged through the discharge port 28.

As shown in the enlarged circle of FIG. 2, the separation distance d between the scraper 90 and the roll 20 is preferably 3 mm to 5 mm. If the separation distance d between the scraper 90 and the roll 20 is less than 3 mm, the separation distance between the scraper 90 and the roll 20 may be too short, and both may collide. In addition, when the separation distance d between the scraper 90 and the roll 20 is more than 5 mm, the separation distance between the scraper 90 and the roll 20 is too large to facilitate the compacted body B from the roll 20. I can't remove it.

In FIG. 3, the scraper 95 shown in FIG. 2 is disassembled and shown. The scraper 95 is installed to connect the inside of the roll casing. Thus, the scraper 95 has a shape extending along the axis 953.

As shown in FIG. 3, the scraper 95 includes a scraper roll 951, an axis 953, and a fixing block 955. In addition, it may further include a bush 952, a stopper 957, a cover member 956, and a base member 959. Although two scraper rolls 951 are shown in FIG. 3, these are merely to illustrate the present invention, but the present invention is not limited thereto. Therefore, many scraper rolls 951 can be provided.

The shaft 953 has a cylindrical rod shape and supports the scraper 95. On the shaft 953, a scraper roll 951, a bush 952 and a cover member 956 are assembled. In order to fix these, the stopper 957 is fixed to the cover member 956 with a bolt 9571. The stopper 957 is pressed against the shaft 953 to fix the scraper roll 951, the bush 952 and the cover member 956. The shaft 953 is fixed to the fixing block 955, and the fixing block 955 is supported by the base member 959 by the bolt 9955 and the nut 9553.

The scraper roll 951 includes a scraper portion 9511 and a fixing portion 9513. The scraper portion 9511 is formed around the fixed portion 9513. The fixing portion 9513 is cylindrical and engaged with the bush 952. The scraper portion 9511 rotates to remove the briquettes attached to the rolls in conjunction with the rolls.

The scraper roll 951 is fixed to the bush 952 to repeat the idling operation. Bush 952 is inserted between shaft 953 and scraper roll 951 to smoothly rotate scraper roll 951. The bush 952 has a cylindrical shape. The T-shaped base member 959 is welded to the roll casing to firmly support the shaft 953.

4, the cross-sectional structure of the state in which the scraper 95 was installed in the briquette manufacturing apparatus is shown. As shown in FIG. 4, five scraper rolls 951 can be provided continuously.

The five scraper rolls 951 shown in FIG. 4 can be used to easily remove the briquettes attached to the roll 20. In particular, since the scraper roll 951 is firmly fixed by the fixing block 955 or the like, the function can be sufficiently exhibited even when the roll 20 rotates at a high speed.

Hereinafter, the operation of the scraper roll 95 will be described with reference to FIGS. 5 and 6.

5 shows a state in which the compacted body B attached to the roll 20 collides with the scraper roll 95 while being broken. The roll 20 rotates clockwise, and the scraper roll 95 rotates counterclockwise. As shown in FIG. 5, since the compacted material B breaks while colliding with the scraper roll 95, it is separated from the roll 20. Therefore, the compacted material B adheres to the roll 20, and can prevent it from continuing to rotate.

As shown in FIG. 5, a plurality of concave portions 9511b and convex portions 9511a are continuously formed on the outer circumference of the scraper portion 951 of the scraper roll 95. The concave portions 9511b and the convex portions 9511a break off the compacts B and are removed from the roll 20.

A plurality of recesses 2041 are formed on the surface of the roll 20, and the recesses 2041 of the roll 20 face the convex portions 9511a of the scraper portion 951. That is, the roll 20 and the scraper roll 95 function as a rack and pinion to prevent the compacted material B from being attached to the roll 20.

6 shows a state in which the compacted body B attached to the roll 20 is crushed while falling between the roll 20 and the scraper roll 95 and falls down. As shown in FIG. 6, since the compacted material B is crushed while the roll 20 and the scraper roll 95 rotate, the compacted material B can be prevented from adhering to the roll 20. As shown in FIG.

7 schematically shows an apparatus for manufacturing molten iron 200 having a compacted material manufacturing apparatus 100 according to an embodiment of the present invention. The compacted material is charged into the molten gasifier 60 and made of molten iron.

The molten iron manufacturing apparatus 200 shown in FIG. 7 includes the compacted material manufacturing apparatus 100, the crusher 40, and the melt gasifier 60. The crusher 40 crushes the compacted material discharged from the compacted material manufacturing apparatus 100. In the melt gasifier 60, the compacted material crushed in the crusher 40 is charged and melted. In addition, the apparatus for manufacturing molten iron 200 may further include a storage tank 50. The reservoir 50 temporarily stores 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, lump coal is an example of coal having a particle size of more than 8 mm taken from the production site. In addition, the coal briquettes may be, for example, coal formed by pressing a pulverized coal having a particle size of 8 mm or less taken from a production site.

The above-mentioned coal is charged into the melting gasifier 60, and oxygen (O ₂ ) is supplied to melt the compacted material and then discharged to the tapping port. Using this method, molten iron of good quality can be easily produced.

Since the compacted material producing apparatus according to the present invention includes a scraper for removing the compacted material adhered to the roll surface, the compacted material can be continuously discharged from the compacted material manufacturing apparatus without interruption, thereby greatly improving the productivity of the compacted material. And since a scraper connects between roll casing inner sides, a fixed structure is firm.

Since the scraper includes a plurality of scraper rolls, it is effective to remove the compact from the roll.

Since the concave portion of the roll faces the convex portion of the scraper roll, the briquette inserted between the roll and the scraper roll can be crushed and removed.

Since the separation distance between a roll and the corresponding scraper is 3 mm-5 mm, the compacted material adhered to a roll can be removed efficiently.

Since the molten iron manufacturing apparatus according to the present invention includes the compacted material manufacturing apparatus described above, it is possible to produce molten iron of good quality.

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 (11)

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. Including, And said scraper comprises a plurality of scraper rolls positioned corresponding to said pair of rolls. In claim 1, The scraper is a compacted material manufacturing apparatus which is installed in the lower portion of the pair of rolls. In claim 1, Each scraper roll, A scraper portion corresponding to the pair of rolls to remove the compacted material, and Fixing part for supporting the scraper part Compacted material manufacturing apparatus comprising a. In claim 3, The scraper part of the said scraper roll is a compacted material manufacturing apparatus spaced apart from each other. In claim 3, The compacted body manufacturing apparatus in which the recessed part and the convex part were formed continuously in the outer periphery of the said scraper part. In claim 5, A large number of recesses are formed on the roll surface, and the recesses of the roll face the convex portion of the scraper portion. In claim 1, The distance between the roll and the scraper corresponding thereto is 3mm to 5mm compact device manufacturing apparatus. In claim 1, The scraper is, An axis connecting the inside of the roll casing in the longitudinal direction of the roll, and A pair of fixing blocks for fixing both ends of the shaft More, And said plurality of scraper rolls are installed on said shaft. In claim 8, The scraper is, A bush inserted between the scraper roll and the shaft, A cover member for supporting the scraper roll and the bush so as not to fall off the shaft, A stopper for fixing the cover member to the shaft, and A fixing member for fixing the fixing block to the roll casing Compacted material manufacturing apparatus further comprising a. 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 10, A molten iron manufacturing apparatus for supplying at least one of a lump coal and coal briquettes to the melting gasifier.

Images