KR101036638B1 - 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 is a charging hopper in which the reducing iron-containing reducing body is charged, a screw installed in the charging hopper and inclined at an acute angle with respect to the vertical direction, and discharges the reducing iron-containing reducing body flowing into the charging hopper. A feeder, and a pair of rolls compressed to produce compacted compacts by compressing the reduced iron-containing reducing body discharged by the screw feeder from the charging hopper and spaced apart from each other to form a gap, each screw feeder being a shaft of a pair of rolls Side by side along the direction, an extension line of the central axis of each screw feeder passes through the gap. Through the present invention as described above, a compacted material having good quality can be produced.

Hard material manufacturing equipment, molten iron manufacturing equipment, inclination angle, screw feeder

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 cross-sectional view taken along line BB of FIG. 1.

4 is a schematic view showing the relationship between the central axis of the screw feeder and the axis of the roll in the compacted material manufacturing apparatus according to an embodiment of the present invention.

5 (A) and (B) are diagrams showing the comparison between the present invention and the prior art with respect to the charging distribution of the reducing body flowing into the roll between the screw feeders, respectively.

(A) and (B) of FIG. 6 are diagrams showing the comparison between the present invention and the prior art with respect to the charging distribution of the reducing body flowing into the roll from the lower part of the screw feeder.

7 is a view schematically showing a molten iron manufacturing apparatus using 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. Accordingly, the current blast furnace method necessarily involves preliminary processing facilities such as coke manufacturing facilities and sintering facilities. Therefore, it is not only necessary to construct additional facilities other than blast furnaces, 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-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 calcined feedstock 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 discharged to the screw feeder disposed in the vertical direction is hardened and cooled at high temperature so as to be suitable for long-distance transportation, thereby producing a sponge iron briquette.

Screw feeders arranged in the vertical direction as described above are suitable for producing small quantities of sponge iron briquettes, and are not suitable for producing large quantities of sponge iron briquettes. In addition, in the case of press-molding the branched iron discharged from the screw feeder disposed in the vertical direction with a briquette, when the amount of the ring-reduced iron is increased to increase the yield, the compacted body is thickened, not formed continuously, but not cut off in the middle. Splitting occurs. In addition, in a facility for producing a large amount of briquettes, the roll length becomes longer as the roll for crimping the reduced ring iron becomes larger, so that the amount of reduced ring iron introduced along the length of the roll is not constant. Therefore, briquettes are broken in the middle or there is a problem that the reduced iron is not well distributed to the center.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a compacted article manufacturing apparatus suitable for mass production of compacted sheets.

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 a charging hopper (load), which is charged with a reducing iron-containing reducing body, is installed in the charging hopper and inclined at an acute angle with respect to the vertical direction and flows into the charging hopper A screw feeder for discharging the reduced iron-containing reductant, and a pair of reducible iron-containing reducing compounds discharged by the screw feeder from the charging hopper to produce compacted materials and are spaced apart to form a gap. A roll, wherein each screw feeder is arranged side by side along the axial direction of the pair of rolls, with an extension of the central axis of each screw feeder passing through the gap.

In addition, the screw feeder is preferably arranged symmetrically.

And the plane comprising the central axis of the screw feeder preferably crosses substantially perpendicularly to the plane comprising the axis of the pair of rolls.

The central axis of the screw feeder is preferably inclined at 7 ° to 9 ° with respect to the vertical direction.

In particular, it is preferable that the central axis of the screw feeder be inclined at substantially 8 degrees with respect to the vertical direction.                     

Moreover, it is preferable that the extension line of the center axis | shaft of each screw feeder intersects on the line passing through the center of a gap in a perpendicular direction.

And the amount of reduced iron containing reducing body flowing into the pair of rolls may be substantially uniform along the length direction of the pair of rolls.

The reducing body may further comprise a side feed.

On the other hand, the molten iron manufacturing apparatus of the present invention includes a compacted material manufacturing apparatus having the above-described structure, a crusher for crushing the compacted material discharged from the compacted material manufacturing apparatus, and a molten gasifier to charge and melt the compacted material crushed in the crusher do.

The molten iron manufacturing apparatus of the present invention supplies at least one coal selected from lump coal and coal briquettes into 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 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. In addition, a scraper 124 (scraper) (shown in FIG. 2) is installed in the screw feeder 12 in the charging hopper 10 to remove the branched iron attached to the inner wall of the charging hopper 10.

In the charging hopper 10, a screw feeder 12 is disposed at an acute angle with respect to the vertical direction to discharge the reduced-reduction iron-containing reducing agent flowing into the charging hopper 10 to the pair of rolls 20. The screw feeder 12 has a screw 122 (shown in FIG. 2) formed at a lower end thereof, and discharges the reduced-reduction iron-containing reducing agent collected at the lower portion by the rotation of a motor (not shown) attached to the upper portion thereof. As shown in FIG. 1, since the screw feeder 12 is arrange | positioned side by side along the Y-axis which is an axial direction of a roll, the reduced-ring iron containing reducing body can be loaded evenly along the longitudinal direction of a pair of rolls.

The lower end of the charging hopper 10 is fitted into a feeding box 30 installed on the upper roll casing 24. The supply box 30 precompresses the reduced iron-containing reducing body discharged using the screw feeder 12 so as to be efficiently distributed along the length direction of the pair of rolls 20.

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 '(shown in FIG. 3, hereinafter same) to produce a compact. The roll cover 26 is attached to the outside of the roll 20. Hereinafter, the internal structure of the compacted material manufacturing apparatus according to an embodiment of the present invention will be described in more detail with reference to FIGS. 2 and 3.

FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG. 1 in the Z-axis direction, in which the central axis of the screw feeder 12 is inclined at an angle α with respect to the vertical direction.

As shown in FIG. 2, the screw feeder 12 has a symmetrical structure, and an extension line of the central axis crosses a line passing through the center of the roll 20 in the vertical direction. Although not shown in FIG. 2, the extension line of the central axis of the screw feeder 12 intersects on the line passing through the center of the gap B 'of the pair of rolls 20.

Since the amount of the reduced-iron-containing reducing body charged as the size of the compacted material manufacturing apparatus increases, it is necessary to install the screw feeder 12 inclinedly to change the distribution of the reduced-iron reduced as shown in FIG. That is, the central axis of the screw feeder 12 is inclined with respect to the vertical direction so that the branched iron charged into the screw 122 faces the center of the roll 20, thereby minimizing the amount of the branched iron scattered to the outside. In addition, it is possible to increase the compression rate of the compacted material to be compressed.

Here, it is preferable that the inclination angle (alpha) with respect to the perpendicular direction of the center axis | shaft of a screw feeder is 7 degrees-9 degrees. If the inclination angle α is less than 7 °, the central axis of the screw feeder 12 is located close to the vertical direction, so that the reduced-reduction iron supply to the center position of the roll 20 is not smooth, and a large amount of powder is released by the compressed gas. Reduced iron is scattered and compression at the center of the roll 20 is impossible. In addition, when the inclination angle α exceeds 9 °, the ring-reducing iron is concentrated only on the center of the roll 20 to the contrary, and there is a problem in that the load is greatly applied.

As described above, when the central axis of the screw feeder is inclined at 7 ° to 9 ° with respect to the vertical direction, the reduced reducing iron-containing reducing body can be optimally compressed, and in particular, the central axis of the screw feeder is substantially in the vertical direction. In the case of 8 °, i.e., 8 ° or close to 8 °, the best quality reduced-ring iron-containing compacted material can be produced.

FIG. 3 is a schematic cross-sectional view taken along the line BB of FIG. 1 in the Z-axis direction, showing that an extension line of the central axis of the screw feeder 12 passes through the gap B 'in a space formed in the supply box 30. .

The pair of rolls 20 includes a roll core 202 and a roll surface 204 in the form of a roll tire surrounding the roll core 202, and compresses the reduced reducing iron-containing reducing body discharged from the top by rotating in the direction of the arrow. In this case, since the extension line of the central axis of the screw feeder 12 passes through the gap B ', the reduced-iron-reducing iron-containing reductant is well charged between the rolls 20, so that the compacted material can be manufactured well, thereby producing a compact product having good quality. have. As a result, the amount of reduced-iron-containing reducing agent flowing into the pair of rolls 20 becomes substantially uniform along the length direction of the pair of rolls 20, so that the reduced-iron can be stably supplied.

Since a plurality of protrusions 361 are formed on the inclined surface 36 formed on the lower side of the supply box 30 located on the upper surface of the roll, the powdered reduced iron delivered to the internal space of the supply box 30 is formed in the roll 20. Blocks scattering to the outside.

4 is a view showing the relationship between the central axis of the screw feeder and the axis of the roll in the compacted material manufacturing apparatus according to an embodiment of the present invention, including a central axis 18 of a pair of screw feeder 12 The plane D including the plane D and the axis | shaft 22 of the pair of rolls 20 has shown mutually crossing.

Thus, it is preferable that the angle (beta) which the plane C and the plane D cross | intersect is close to a right angle. That is, it is preferable that the plane D including the central axis 18 of the screw feeder 12 and the plane C including the axis 22 of the pair of rolls 20 substantially cross at right angles. In this way, the plane C and the plane D intersect at right angles or close to right angles, so that the reduction body from the screw feeder 12 to the gap B '(shown in FIG. 3) between the pair of rolls 20. Not only is supply smooth but uniform supply is possible, and it is possible to manufacture a compacted material having good quality without cracking at the center.

Hereinafter, the present invention will be described in more detail with reference to the prior art with respect to the charging distribution of the reducing iron-containing reducing body flowing into the roll through FIGS. 5 and 6.

5 (A) and (B) are diagrams showing the comparison between the present invention and the prior art with respect to the charging distribution of the reducing body flowing into the roll between the screw feeders, respectively. In more detail, Figure 5 (A) shows the charging distribution of the reducing agent flowing into the gap between the pair of rolls 20 at the point F of Figure 2, Figure 5 (B) Likewise, the charging distribution of the reducing agent flowing into the pair of rolls 20 at the point between the screw feeders when charging the reducing body by standing the screw feeder in the vertical direction is shown. Here, in FIG. 5 (A) and (B), the charging distribution of a reducing body is observed and shown in a brief direction across a pair of rolls.

As shown in Fig. 5A, in the present invention, the screw feeder is inclined at an acute angle with respect to the vertical direction so that the reduced reducing iron-containing reducing agent is concentrated in the center of the roll. Since the inflow amount to the roll center is adjusted appropriately by such oblique transfer, a large amount of reduced-ring iron-containing reducing agent passes through the center of the roll to produce a compact of good quality at the center of the roll, regardless of the size of the compact.

On the other hand, in the prior art shown in Fig. 5B, the reduced iron-containing reducing body is vertically transferred so that the inflow amount between the screw feeders is insufficient, so that the compacted material is poorly produced. Therefore, the compacted material is cut off in the middle, there is a disadvantage that a large amount of dust is generated according to the crushing.

(A) and (B) are views showing comparison of the present invention and the prior art with respect to the charging distribution of the reducing body flowing into the roll from the screw feeder, respectively. In more detail, Figure 6 (A) shows the charging distribution of the reducing agent flowing into the gap between the pair of rolls 20 at the point E of Figure 2, Figure 6 (B) and the prior art Likewise, the charging distribution of the reducing agent flowing into the pair of rolls 20 at the lower point of the screw feeder when the reducing agent is charged by standing the screw feeder in the vertical direction is shown. Here, in FIG. 6 (A) and (B), the charging distribution of the reducing body is briefly observed by observing from the direction across a pair of rolls.                     

As shown in Fig. 6A, the present invention inclines the screw feeder at an acute angle with respect to the vertical direction, thereby expanding the space in which the reduced-ring iron-containing reducing body can stay. Therefore, since a large amount of reduced-ring iron-containing reducing bodies can be supplied to the roll below the skew feeder, a compacted body having a uniform quality in the entire length direction of the roll can be produced.

On the other hand, in the prior art illustrated in FIG. 6B, the reduced iron-containing reducing body is vertically transferred so that the screw feeder is relatively close to the roll, thereby reducing the space in which the reducing iron-containing reducing body can stay. Therefore, there is a problem that the amount of reduced iron-containing reducing agent charged in the roll is not enough to produce a compacted material of good quality, and malfunction due to clogging of the screw feeder due to lack of residence space.

As described above, in the compacted material producing apparatus of the present invention, compacted material can be produced in large quantities by adjusting the distribution point of the reduced-ring iron-containing reducing body.

7 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. 7 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 include coal having a particle size of more than 8 mm taken from the mountainous area, and the coal briquettes may be coal formed by pressing a coal after crushing coal having a particle size of 8 mm or less taken from the production site and mixing the binder.

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 compact manufacturing apparatus of the present invention, since the screw feeders are arranged side by side along the axial direction of the pair of rolls and the extension line of the central axis of the screw feeders passes through the gaps between the rolls, the ring feeder is reduced along the length of the rolls by the screw feeders. Stable operation can be realized by appropriately supplying a reducing compound.

And since the screw feeder is disposed symmetrically, it is possible to uniformly adjust the amount of reduced iron-containing reducing body supplied through a pair of screw feeder.

Since the plane including the central axis of the screw feeder substantially crosses at right angles with the plane including the axis of the pair of rolls, the reducing iron-containing reducing agent can be satisfactorily introduced into the gap between the pair of rolls to prevent scattering of the reducing iron. have.

Since the central axis of the screw feeder is inclined at 7 ° to 9 ° and substantially 8 ° with respect to the vertical direction, it is possible to produce a compact of good quality without breakage due to the change in distribution of the reduced-ring iron-containing reducing body by oblique conveying.

Since the extension line of the center axis | shaft of a screw feeder crosses on the line passing through the center of the gap between rolls in a perpendicular direction, it can smoothly supply a reduced iron containing reducing body to a roll center.

Since the amount of the reduced iron-containing reducing agent flowing into the pair of rolls is substantially uniform along the length direction of the pair of rolls, a compact of good quality can be produced.

In addition, the reducing agent may further include an auxiliary material to further improve the physical properties of the reducing agent.

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 (10)

A charge hopper into which a reduced iron-containing reducing body is charged, A screw feeder installed in the charging hopper, inclined at an acute angle with respect to the vertical direction, and discharging the reduced iron-containing reducing agent flowing into the charging hopper; A pair of rolls are formed by compressing the reduced or reduced iron-containing reducing substance discharged by the screw feeder from the charging hopper, and forming a gap by being spaced apart from each other. Including, And each screw feeder is arranged side by side along the axial direction of the pair of rolls, and an extension line of the central axis of each of the screw feeders passes through the gap. In claim 1, The screw feeder is a compacted material manufacturing apparatus disposed in the symmetrical direction. In claim 1, And a plane including a central axis of the screw feeder substantially crosses a plane perpendicular to a plane including the axes of the pair of rolls. In claim 1, The center axis of the screw feeder is inclined 7 ° to 9 ° with respect to the vertical direction manufacturing apparatus for compacted material. In claim 4, And a central axis of the screw feeder is inclined at substantially 8 ° with respect to the vertical direction. In claim 1, 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. In claim 1, An apparatus for producing compacted material, wherein the amount of the reducing iron-containing reducing agent flowing into the pair of rolls is substantially uniform along the length direction of the pair of rolls. In claim 1, The reducing body further comprises a compact raw material manufacturing apparatus. 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 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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