KR101036640B1 - An apparatus for manufacturing compacted irons 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 material manufacturing apparatus of the present invention comprises a pair of charged hoppers into which a reduced iron-containing reducing body is charged, and compacted iron-containing reduced materials discharged from a charged hopper to produce compacted materials and are spaced apart from each other to form a gap. A roll, wherein the charging hopper includes a guide tube extending toward the gap, the guide tube inclined at an acute angle with respect to the vertical direction, and the end of the guide tube surrounds the center of the gap in the axial direction of the roll. Through the present invention as described above, a compacted material having good quality can be produced.

Guide tube, inclination angle, oval, compacted material manufacturing equipment, molten iron manufacturing equipment

Description

Device for producing compacted iron containing reduced-ring iron, and apparatus for manufacturing molten iron using 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 perspective view of a guide tube according to an embodiment of the present invention.

Figure 4 is a schematic diagram showing the relationship between the axis of the guide tube and the roll in the compacted material manufacturing apparatus according to an embodiment of the present invention.

5 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 compression molding of reduced reduced iron (direct reduced iron, DRI) containing the same It relates to a molten iron manufacturing apparatus for manufacturing molten iron.

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 that uses plain coal and spectroscopy directly. 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 transport to produce sponge 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 has been made to solve the above-mentioned problems, and an object of the present invention is to provide an apparatus for producing compacted material suitable for producing a large amount of compacted material.

Moreover, an object of this invention is to provide the molten iron manufacturing apparatus which can manufacture molten iron of high quality using the compacted material of good quality.

The compacted material manufacturing apparatus of the present invention for achieving the above object is to produce a compacted material by compressing a charged hopper loaded with a reducing iron-containing reducing body, and a reducing iron-containing reducing material discharged from the charging hopper and spaced apart from each other. A pair of rolls to form a gap, the charging hopper comprising a guide tube extending toward the gap, the guide tube being inclined at an acute angle with respect to the vertical direction, The end surrounds the center of the gap in the axial direction of the roll.

Here, it is preferable that the end surface of a guide tube is elliptical shape.

In addition, the length of the guide tube is preferably longer as the distance from the center of the gap.

It is preferable that a step is formed in the outer periphery of the guide tube.

The difference between the longest length of the guide tube and the shortest length of the guide tube is preferably 0.54r to 1.15r. Where r is the inner radius of the guide tube.

Further, the plane comprising the shortest length and the longest length of the guide tube may substantially cross at right angles to the plane comprising the axes of the pair of rolls.

It is preferable that the compacted-body manufacturing apparatus of this invention further includes the feeding box which the guide tube couple | bonds and delivers a reduced iron containing reducing body to a pair of rolls.

And the end of the guide tube corresponding to the longest length of the guide tube is preferably projected to the bottom of the supply box.

The end face of the guide tube is preferably inclined at 20 ° to 35 ° with respect to the horizontal plane.

In addition, it is preferable that the compacted material manufacturing apparatus of this invention further includes the screw feeder which is installed in the charging hopper and discharges the reduced-ring-iron-containing reducing substance which flows into a charging hopper to a gap.

Here, the extension line of the central axis of each screw feeder may cross on the line passing through the center of the gap in the vertical direction.

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 5. 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 manufacturing 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). The sieve 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. Inside the charging hopper 10, a scraper 124 (shown in FIG. 2) is installed in the screw feeder 12 to remove the branched iron attached to the inner wall of the charging hopper 10.

The charging hopper 10 includes a guide tube 70 extending downward. The guide tube 70 is coupled to a feeding box 30 installed above the roll casing 24. The supply box 30 delivers the reduced iron-containing reducing body discharged using the screw feeder 12 to the pair of rolls 20 to be uniformly distributed along the length direction.

Inside the charging hopper 10 is provided a screw feeder 12 for discharging the reduced iron containing reducing agent flowing into the charging hopper 10 to the gap (B) between the pair of rolls (20). . The gap B here refers to the space between the rolls which exist along the longitudinal direction of a pair of rolls. The screw feeder 12 has a screw 122 (shown in FIG. 2) formed at a lower end thereof, and the reduced feed iron-containing reducing agent collected at the lower side by gravity is rotated downward by the rotation of a motor (not shown) attached to the upper side. Forced discharge

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 B to produce a compact. 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 AA line of FIG. 1 in the Z-axis direction, in which an end portion of the guide tube 70 surrounds the center of the gap B in the axial direction of the roll 20.

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, in the present invention, in order to prevent scattering of the reduced ring iron during mass production of the compacted material, the length of the guide tube 70 is gradually increased as the distance from the center of the gap B is increased. As such, since the guide tube surrounds the center of the gap B in the axial direction of the roll, it is possible to minimize the amount of branched iron that is 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. Thereby, the compacted material of favorable 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.

In particular, the guide tube 70 is inclined with respect to the horizontal plane in order to prevent scattering of the reducing iron-containing reducing body. In FIG. 2, this inclination angle is represented by gamma. As can be seen from the cross-sectional structure of the guide tube 70 shown in FIG. 2, the end face 715 of the guide tube 70 is preferably inclined 20 ° to 35 ° with respect to the horizontal plane. That is, it is preferable that the inclination angle (gamma) is 20 degrees-35 degrees.

If the inclination angle γ is less than 20 °, the reduced iron does not flow well into the gap center between the rolls, and if the inclination angle γ is more than 35 °, the lower space of the supply box 30 becomes larger, so that the gas in the upper portion of the lower space is increased. Because of the stagnation, chances are that the reduced-iron will be scattered outside.                     

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 arrangement of the guide tubes 70. In addition, since uniform distribution of the reduced-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 hardening without breakage is possible. 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 is a schematic perspective view of a guide tube 70 according to an embodiment of the present invention, the enlarged circle on the left side has a side 711 corresponding to the shortest length of the guide tube 70 and the side corresponding to the longest length ( The cross-sectional shape cut | disconnected including 713 is shown, and the end surface 715 of the guide tube 70 seen from the Z-axis direction is shown by the enlarged circle on the right side.

As shown in FIG. 3, since the guide tube 70 according to the exemplary embodiment has an inclined shape, the end surface 715 has an elliptical shape as shown in the enlarged right circle of FIG. 3. . Since the guide tube 70 has an elliptical end face 715 as described above, the guide tube 70 effectively surrounds the center of the gap in the longitudinal direction of the roll when installed in the compacted material manufacturing apparatus, thereby stably reducing the reducing iron-containing reducing body toward the center. Can supply 3, the step is formed in the outer periphery of the guide tube 70, and is superimposed on the cheek plate 80 (shown in FIG. 2). Accordingly, the flow path of the ring reducing iron that can escape between the guide tube 70 and the peak plate 80 is prevented from being scattered.

Hereinafter, the end face shape of the elliptical guide tube is analyzed in more detail through the left enlarged circle of FIG. 3.

Since the shape of the end face 715 of the guide tube 70 is oval, as shown in the left enlarged circle of FIG. 3, the side 713 corresponding to the longest length of the guide tube and the side 711 corresponding to the shortest length are shown. Has made an inclination angle (alpha). It is preferable that the inclination angle (alpha) is 15 degrees-30 degrees here. If the angle of inclination α is less than 15 °, even if the guide tube 70 is installed at an inclined angle, it is ineffective in preventing the scattered iron from scattering to the outside, and if the angle of inclination α exceeds 30 °, it is supplied. Since the lower space of the box 30 becomes larger and the gas is stagnated in the upper portion of the lower space, there is a possibility that the reducing iron is scattered to the outside.

If the angle of inclination (α) is further quantified and expressed as follows. As shown in the left enlarged circle of FIG. 3, the inner diameter of the guide tube 70 is 2r, and the side 713 corresponding to the longest length of the guide tube 70 and the side 711 corresponding to the shortest length are shown. If the length difference between and is h, the following equation holds.

tanα = h / 2r

Where α is the inclination angle of the side corresponding to the shortest length of the guide tube and the side corresponding to the longest length, h is the length difference thereof, and r is the inner radius of the guide tube.

In equation 1, h = 2rtanα, α is 15 ° to 30 °, h is 2rtan15 ° to 2rtan30 °, that is, h is 0.54r to 1.15r.                     

Since the guide tube of such a structure is suitable for a large compacted material manufacturing apparatus to minimize the scattered iron scattering of the roll side portion, it is possible not only to implement a stable operation, but also to minimize the scattering and ultimately lower the manufacturing cost.

4 is a view showing the relationship between the guide tube and the axis of the roll in the compact manufacturing apparatus according to an embodiment of the present invention, the plane (D) including the side corresponding to the shortest length and the longest length of the guide tube and The plane C including the axis | shaft 22 of a pair of roll 20 has shown mutually crossing.

Thus, it is preferable that the angle (beta) which the plane C and the plane D cross | intersect is substantially right angle. That is, the plane D including the guide tube 70 and the plane C including the axis 22 of the pair of rolls 20 preferably cross at right angles or close to right angles. Thus, since plane C and plane D substantially cross at right angles, the supply of the reducing body from the guide tube 70 to the gap B (shown in FIG. 2) between the pair of rolls 20 is reduced. Not only smooth but also uniform supply is possible to produce a good quality strip-shaped compact.

5 is a view schematically showing a molten iron manufacturing apparatus using a compacted material manufacturing apparatus according to an embodiment of the present invention, showing 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. 5 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 in 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.

In the compacted article manufacturing apparatus of the present invention, the guide tube is inclined at an acute angle with respect to the vertical direction, and the end of the guide tube surrounds the center of the gap in the axial direction of the roll, thereby preventing the scattering of the ring reducing iron, thereby reducing the stability of the reducing iron-containing reducing body. Supply is possible.

In addition, since the end face of the guide tube is elliptical, the reduced-ring iron-containing reducing body can be collected at the center of the roll, which is suitable for a large compacted material manufacturing apparatus.

And since the length of the guide tube increases gradually away from the center of the gap, it is possible to concentrate the charged reducing iron-containing reducing body flowing into the roll to the center to produce a compact compact good.                     

Since the step is formed on the outer circumference of the guide tube, the guide tube can be overlapped with the cheek plate to prevent the branched iron from scattering to the outside.

Since the difference between the longest length and the shortest length of the guide tube is 0.54r to 1.15r, the reduced-iron-containing reducing body can be charged in the center of the roll.

The plane including the shortest length and the longest length of the guide tube crosses substantially perpendicularly to the plane including the axis of the pair of rolls so that the reducing iron-containing reducing agent can be more easily introduced into the gap.

Since the compacted material manufacturing apparatus of this invention further includes the supply box in which the guide tube is inserted, it is easy to load the reduced iron containing reducing body into a roll center part.

In addition, an end portion of the guide tube corresponding to the longest length of the guide tube protrudes to the lower part of the supply box, thereby preventing scattered iron from scattering into the supply box.

Since the end face of the guide tube is inclined at 20 ° to 35 ° with respect to the horizontal plane, it is possible to effectively prevent scattering of the branched iron.

Since the compacted material manufacturing apparatus of this invention further contains a screw feeder, the reduced-ring iron containing reducing body can be charged between rolls more efficiently.

Since the extension line of the central axis of the screw feeder crosses on the line passing through the center of the gap in the vertical direction, the reducing iron-containing reducing body can be charged more efficiently between the rolls.

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 (13)

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, the guide tube inclined at an acute angle with respect to the vertical direction, and an end of the guide tube surrounds the center of the gap in the axial direction of the roll. Compacted material manufacturing apparatus. In claim 1, An end face of the guide tube is an ellipsoidal shape manufacturing apparatus. 3. The method of claim 2, The length of the guide tube is a device for manufacturing compacted material is gradually longer as the distance from the center of the gap. 4. The method of claim 3, The compacted material manufacturing apparatus in which the step | step was formed in the outer periphery of the said guide tube. 4. The method of claim 3, And a difference between the longest length of the guide tube and the shortest length of the guide tube is 0.54r to 1.15r. Where r is the inner radius of the guide tube. 4. The method of claim 3, And a plane including the shortest length and the longest length of the guide tube substantially perpendicularly intersect the plane including the axes of the pair of rolls. 4. The method of claim 3, The guide tube is coupled, the compacted material manufacturing apparatus further comprises a feeding box (feeding box) for delivering the reduced iron-containing reducing body to the pair of rolls. In claim 7, And an end portion of the guide tube corresponding to the longest length of the guide tube protrudes below the supply box. 4. The method of claim 3, An end surface of the guide tube is inclined at 20 ° to 35 ° with respect to the horizontal plane apparatus for producing compacted material. In claim 1, And a screw feeder installed in the charging hopper and discharging the reduced iron-containing reducing agent flowing into the charging hopper into the gap. In claim 10, An extension line of the center axis | shaft of each said screw feeder cross | intersects on the line which passes the center of the said gap in a perpendicular direction. 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. The method of claim 12, 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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