KR20070007503A - Apparatus for manufacturing compacted irons of reduced materials comprising fine direct reduced irons and apparatus for manufacturing molten irons provided with the same - Google Patents

Abstract

A compacted iron manufacturing equipment suitable for manufacturing a large quantity of compacted iron, and a molten iron manufacturing apparatus having the compacted iron manufacturing equipment are provided. An equipment for manufacturing compacted iron comprises: charging hoppers into which reduced materials containing fine direct reduced iron are charged; and a pair of rolls which manufacture compacted iron by pressing reduced materials containing fine direct reduced iron discharged from the charging hoppers, and which are spaced from each other to form a gap, wherein the charging hoppers comprise guide tubes(70) which extend toward the gap, and have a cooling medium flowing through an inner part thereof. The guide tubes are formed in such a manner that inner diameter of the guide tubes is gradually increased along a discharge direction of the reduced materials containing fine direct reduced iron, and a ratio of the longest length(h) of the guide tubes to a difference between an inlet's inner diameter(D1) of the guide tubes and an outlet's inner diameter(D2) of the guide tubes is 75 to 100. The guide tubes comprise a guide tube inner pipe(701) through which the reduced materials containing fine direct reduced iron pass, and a guide tube outer pipe(703) for enveloping the guide tube inner pipe.

Description

Apparatus for manufacturing compacted iron containing reduced-ring 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.

3 is a schematic cross-sectional view of a guide tube according to an embodiment of the present invention.

4 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 having the same, and more particularly, compacted material manufacturing apparatus for producing compacted material by compression molding the reduced reduced iron (direct reduced iron (DRI) containing; It relates to a molten iron manufacturing apparatus.

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. 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-pressure gas stream is formed at the upper part of the molten gasifier, there is a problem in that the branched iron and 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. Further, US Pat. Nos. 4,093,455, 4,076,520, and 4,033,559 disclose methods and apparatus for producing plate- 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, as described above, the apparatus for producing spongy iron briquettes charged with reduced iron is suitable for producing a small amount of spongy iron briquettes and not for producing a large amount of spongy iron briquettes. In the case of manufacturing iron sponge briquettes in this way, if the loading of the reducing iron is increased to increase the yield, a split phenomenon occurs in which the center of the reduced iron briquettes splits, and a large amount of dust is generated during crushing in the post-stage process. There is a problem that the breathability deteriorates when charging.

In addition, in a mass production facility, the roll length becomes longer as the roll for crimping the reduced ring iron becomes larger, so that the amount of reduced reduced iron introduced along the length direction of the roll is not constant and is divided into the central portion of the roll length direction. There is a problem that the reduced iron is not well distributed compacting (compacting) or briquette is broken in the middle. In the case of a large briquette manufacturing apparatus, there is a problem that a large amount of reducing iron is scattered to the outside of the charging hopper due to a large amount of reducing agent flows into the upper portion of the roll.

The present invention is to solve the above-mentioned problems, to provide a compacted material manufacturing apparatus suitable for producing a large number of compacted material.

Another object of the present invention is to provide an apparatus for manufacturing molten iron having the compacted material manufacturing apparatus described above.

In the compacted material manufacturing apparatus according to the present invention, a compacted hopper into which a reduced iron-containing reducing body is charged, and a compacted iron-containing reduced body discharged from the charged hopper are compressed to produce compacted materials, and are spaced apart from each other. And a pair of rolls to form. The charging hopper includes a guide tube extending toward the gap, through which the cooling medium flows.

The inner diameter of the guide tube may gradually increase along the discharge direction of the reducing iron-containing reducing body.

The ratio of the longest length of the guide tube to the difference between the inside diameter of the guide tube and the inside diameter of the outlet side is preferably 75 to 100.

The guide tube includes a guide tube inner tube through which the reducing iron-containing reducing substance passes and a guide tube outer tube surrounding the guide tube.

It is preferable that a cooling medium flows between the guide tube inner tube and the guide tube outer tube.

The guide tube outer tube is formed with a spiral groove facing the guide tube inner tube, so that the cooling medium can flow along the spiral groove.

The cross section of the helical groove may be semicircular.

The cooling medium is preferably nitrogen.

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 gasifier for charging and melting the compacted material crushed in the crusher.

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 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. Since the central part is formed convexly and its lower space is also convexly formed 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, and the screw feeder ( 12) is used to deliver 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.

FIG. 2 shows the cross-sectional structure of the compacted body manufacturing apparatus 100 cut along the AA line of FIG.

The central axis extension line of the screw feeder 12 with the screw 122 attached to the lower portion intersects on the line passing through the center of the roll 20 in the vertical direction. Extension lines of the central axis of the screw feeder 12 intersect on the line passing through the center of the gap B of the pair of rolls 20. To the left and right of the roll 20, the cheek plate 80 is attached to prevent the reducing iron-containing reducing body from scattering to the outside.

In particular, when producing a compacted material in large quantities, the length of the guide tube 70 is gradually increased as the distance from the center of the gap (B) in order to prevent scattering of the reduced ring iron. Since the guide tube surrounds the center of the gap B in the axial direction of the roll 20, it is possible to minimize the amount of reduced-return iron scattered to the outside. In addition, since the guide tube 70 is disposed to be inclined at an acute angle with respect to the vertical direction, when the reducing iron-containing reducing body flows in between the pair of rolls 20, the reducing iron-containing reducing body along the longitudinal direction of the pair of rolls 20. The distribution of can be made uniform, and the loading of the reducing iron-containing reducing body can be well performed at the center. Therefore, the compacted material of good quality can be manufactured.

The outer end of the guide tube 70 inserted into the supply box 30, that is, the end 7141 of the guide tube corresponding to the longest length of the guide tube 70, projects below the supply box 30. Therefore, not only the reducing iron can be prevented from scattering to the outside of the supply box 30, but also the blocking iron is scattered to the outside through the cheek plate 80.

When the reducing iron-containing reducing agent flows into the pair of rolls 20 in a large amount, the scattering of the reducing iron can be effectively prevented due to the guide tube 70. In addition, since uniform distribution of the reducing iron-containing reducing body discharged from the guide tube 70 by the screw feeder 12 is possible, the charging of reduced iron into the center is strengthened, so that stable operation is possible, so that good quality lumps are formed without breakage. Sieves can be prepared.

Hereinafter, the specific shape of the guide tube 70 will be described in more detail with reference to FIG. 3.

3 shows a cross-sectional structure of the guide tube 70. As shown in FIG. 3, the cooling medium flows through the interior of the guide tube 70. Since the high-temperature reduced-iron-containing reducing substance passes through the guide tube 70, there is a possibility that the guide tube 70 is thermally deformed. Therefore, when the cooling medium flows through the inside of the guide tube 70, the guide tube 70 is cooled, and thermal deformation does not occur. As the cooling medium, water or nitrogen may be used. It is desirable to use nitrogen as the cooling medium for operational safety.

As shown in FIG. 3, the guide tube 70 is designed to gradually increase along the discharge direction of the reducing iron-containing reducing body. That is, the outlet side inner diameter D ₂ of the guide tube is larger than the inlet side diameter D ₁ of the guide tube. The guide tube 70 is in the form of a taper. Therefore, communication of the reduced iron containing reducing body from the top to the bottom of the guide tube 70 is smooth.

The guide tube 70 is manufactured to be inclined at the lower portion thereof so that the reduced reducing iron-containing reducing body does not leak to the outside. When the longest length of the guide tube 70 corresponding thereto is h, the longest length of the guide tube 70 with respect to the difference between the inlet inner diameter D ₁ and the outlet inner diameter D ₂ of the guide tube 70 ( The ratio of h) is preferably 75 to 100. If the ratio is less than 75, the difference between the guide tube 70, the inlet side inner diameter D ₁ , and the outlet side inner diameter D ₂ becomes too large to be applicable to the design of the compacted body manufacturing apparatus. In addition, when the ratio exceeds 100, the guide tube 70, the inlet side inner diameter D ₁ and the outlet side inner diameter D ₂ become substantially the same, and the reduced reducing iron-containing reducing body cannot be smoothly discharged.

The guide tube 70 includes a guide tube inner tube 701, a guide tube outer tube 703, and a flange 705. In addition, it may include other parts. The reduced iron-containing reducing body passes through the guide tube inner tube 701. The guide tube outer tube 703 surrounds the guide tube inner tube 701. The flange 705 surrounding the upper portion of the guide tube outer tube 703 abuts the charging hopper 10 located at the upper portion. The flange 705 seals between the charging hopper 10 and the guide tube 70, so that the reducing iron-containing reducing agent does not leak to the outside.

The cooling medium flows between the guide tube inner tube 701 and the guide tube outer tube 703. Since the guide tube inner tube 701 and the guide tube outer tube 703 are in close contact, there is no possibility that the cooling medium leaks to the outside. A spiral groove 7031 is formed in the guide tube outer tube 703. The spiral groove 7031 is connected from the cooling medium inlet 709 to the cooling medium outlet 711. The spiral groove 7031 completely surrounds the guide tube 70. Since the cooling medium flows along the spiral groove 7031, the guide tube 70 can be cooled smoothly. The cross section of the spiral groove 7031 can be formed in a semicircle. In this case, the processing of the guide tube 70 is easy.

Figure 4 schematically shows a molten iron manufacturing apparatus 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. 4 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.

In the compact manufacturing apparatus according to the present invention, since the cooling medium flows through the inside of the guide tube, the guide tube can be cooled to prevent thermal deformation.

Since the inner diameter of the guide tube gradually increases along the discharge direction of the reducing iron-containing reducing body, the reducing iron-containing reducing body can be smoothly discharged.

Since the cross section of the helical groove is semicircular, the processing of the guide tube is easy.

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 the finely divided coal collected at the production site can be used directly, not only the production cost is reduced but also there is no pollution problem.

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 (10)

A charge hopper into which a reduced iron-containing reducing body is charged, and A pair of rolls are prepared by compressing the reduced reducing iron-containing reducing substance discharged from the charging hopper, and forming a gap by being spaced apart from each other. Including, The charging hopper includes a guide tube extending toward the gap side, wherein the cooling medium flows through the inside of the guide tube manufacturing apparatus. In claim 1, The inner diameter of the guide tube is a compacted material manufacturing apparatus that gradually increases along the discharge direction of the reducing iron-containing reducing body. In claim 2, And a ratio of the longest length of the guide tube to the difference between the inside diameter of the inlet side and the outlet side of the guide tube is 75 to 100. In claim 1, The guide tube, A guide tube inner tube through which the reducing iron-containing reducing body passes, and A guide tube outer tube surrounding the guide tube inner tube Compacted material manufacturing apparatus comprising a. In claim 4, An apparatus for producing compacted material, in which the cooling medium flows between the guide tube inner tube and the guide tube outer tube. In claim 5, And a spiral groove facing the guide tube inner tube is formed in the guide tube outer tube, and the cooling medium flows along the spiral groove. In claim 6, Cross section of the spiral groove is semi-circular shaped compact manufacturing apparatus. In claim 1, And said cooling medium is nitrogen. 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 9, A molten iron manufacturing apparatus for supplying at least one coal selected from lump coal and coal briquettes into the melting gasifier.

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