KR100797843B1 - Apparatus for manufacturing agglomerate and apparatus for manufacturing molten irons using the same - Google Patents

Abstract

An apparatus for manufacturing agglomerate and an apparatus for manufacturing molten irons using the same are provided to reduce the time required for replacement and to improve workability by improving durability of a crusher, thereby extending the replacement cycle of facilities. An apparatus for manufacturing agglomerate includes at least a pair of forming rolls for pressing a powder type raw material to manufacture agglomerate, and a crusher for crushing the agglomerate manufactured by the forming rolls, wherein the crusher includes a shaft(32) having a cooling channel(32a) formed therein, and a roll(34) which has protrusions(34b) formed on an outer peripheral surface thereof, encircles the shaft, and is connected to the shaft. The roll includes a shoulder(34a) for encircles the shaft, and the protrusions are disposed on the shoulder in the length direction of the shaft apart one another. The shoulder includes grooves(34c) formed between the protrusions to absorb heat deformation of the protrusions.

Description

Agglomerate manufacturing apparatus and molten iron manufacturing apparatus using the same {APPARATUS FOR MANUFACTURING AGGLOMERATE AND APPARATUS FOR MANUFACTURING MOLTEN IRONS USING THE SAME}

1 is a view schematically showing an apparatus for producing reduced iron-containing compacted material according to an embodiment of the present invention.

2 is a perspective view of a crusher according to an embodiment of the present invention.

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

Figure 4 is a schematic diagram of a molten iron manufacturing apparatus according to an embodiment of the present invention.

The present invention relates to an apparatus for manufacturing compacted iron and an apparatus for manufacturing molten iron using the same, and more particularly, to an apparatus for manufacturing a reduced-iron-containing compacted iron that can be smoothly dissolved by being charged into a molten gas furnace and a molten iron manufacturing apparatus using the same. will be.

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-speed gas stream is formed on the upper part of the molten gasifier, there is a problem in that the branched iron and the calcined auxiliary material 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 charging the reduced-reduced iron and calcined subsidiary materials into a high temperature briquette into a molten gasifier has been studied. In such molten iron manufacturing process, the reduced-reduced iron and calcined raw materials are molded into briquettes, crushed to a certain size, and charged into a molten gasifier.

At this time, the crusher used to crush the briquettes crush the briquettes under high temperature environmental conditions, so that thermal deformation and breakage occur. Therefore, the replacement cycle of the facility is short, there is a problem that is difficult to use in the long term.

The present invention is to solve the above-mentioned problems, an object of the present invention is to improve the durability of the shredder to extend the equipment replacement cycle, to shorten the replacement work time and improve the workability.

The compacted material manufacturing apparatus which concerns on this invention contains the at least 1 pair of shaping | molding roll which compresses powdery raw material, and manufactures a compacted material, and the crusher which grinds the compacted material manufactured by the shaping | molding roll, A crusher provided with a cooling flow path A protrusion is provided on the shaft and its outer circumferential surface, and includes a roll that surrounds the shaft and is coupled to the shaft.

The roll includes a shoulder surrounding the shaft, and the protrusions may be disposed spaced apart from each other along the longitudinal direction of the shaft on the shoulder.

The shoulder may include grooves formed between the protrusions to absorb thermal deformation of the protrusions. The groove can have a substantially rectangular cross-sectional shape.

The protrusion may be disposed in an area of width smaller than the width along the longitudinal direction of the shaft of the shoulder.

The cooling flow path may be disposed in an area having a wider width than the area in which the protrusion is disposed.

The cooling passage can be inserted into the central axis of the shaft and wrap the shaft in the shape of a spiral.

The roll may consist of a one body. The protrusion may have a substantially rectangular cross-sectional shape. The wear resistant coating layer may be formed on the surface of the protrusion.

The powdery raw material may include a reduced iron-containing reducing body and a calcined auxiliary raw material.

The compacted material manufacturing apparatus may further include a second crusher for controlling the particle size distribution of the compacted material by crushing the compacted material again in the crusher.

On the other hand, the molten iron manufacturing apparatus according to the present invention includes a compacted gas production apparatus for compacting powdered raw material and a melt gasifier to charge and melt the compacted material produced in the compacted material manufacturing apparatus, the compacted body manufacturing apparatus is reduced ring iron At least one pair of forming rolls for compressing the containing reducing body to produce the compacted body, and a crusher for crushing the compacted body made from the molding roll, the crusher having a shaft having a cooling flow path and a plurality of protrusions on the outer circumferential surface thereof; And a roll surrounding the shaft.

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

1 is a view schematically showing an apparatus for manufacturing a reduced iron containing compacted iron 100 according to an embodiment of the present invention, a schematic diagram of an apparatus for producing compacted material by compressing and crushing a reduced iron (direct reduced iron, DRI) It is a figure shown. 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 compacted material manufacturing apparatus 100 can also be modified into other structures.

In particular, although FIG. 1 shows that only the reducing iron is charged in the charging device 11, this is merely to illustrate the present invention and the present invention is not limited thereto. Accordingly, compacted iron-containing reducing bodies may be compressed and crushed to produce compacted materials, wherein the reduced iron-containing reducing bodies may further include calcined secondary raw materials for calcining reduced-ring iron.

As shown in FIG. 1, the compacted material producing apparatus 100 includes a charging device 11, a pair of forming rolls 20, a crusher 30, and a second crusher 40. In addition, the compacted material manufacturing apparatus 100 includes the level control apparatus 13, the closing valve 15, the charging hopper 25, and the guide chute 29 as needed.

The charging device 11 discharges the reduced reducing iron-containing reducing material charged into the upper part at a variable control rate of 60 tons or less per hour and supplies it to the pair of forming rolls 20. Thus, since a large amount of reduced-iron-containing reducing bodies can be treated, there is an advantage in that a large amount of compacted material can be continuously produced.

A reduced iron-containing reducing body can be prepared by passing a mixture of iron ore and secondary raw materials through a fluid reduction reactor. The reduced iron-containing reducing body thus produced can be supplied to the charging device 11. The charging device 11 may store a reduced iron-containing reducing body having a specific gravity of about 2 ton / m ³ or more and 700 ° C. or more through the fluid reduction path. Since the discharge pressure of the final flow reduction path is about 3 bar and the flow rate is about 3000 m ³ / h, the high-temperature reduced-iron-containing reducing body is fed to the charging device 11. Although compacted materials can be manufactured using only high-temperature reduced-reduced iron alone without calcined sub-materials, in order to prevent high-temperature reduced-reduced iron from being easily broken in the molten gas furnace, the mixed sub-materials are mixed with high-temperature reduced-reduced iron to add 3wt% ~ It is preferable to make it about 20 wt%.

The level control apparatus 13 is installed in the lower part of the charging apparatus 11. The level control device 13 detects the level of the reduced iron-containing reducing body stored in the charging device 11, and blocks the transfer or reduces the transfer amount of the reduced iron-containing reducing body from the flow reduction furnace when the predetermined level is reached. Moreover, the closing valve 15 is provided in the lower part of the charging device 11. The on-off valve 15 includes an opening and closing plate 15a for opening and closing the lower end of the charging device 11 and a hydraulic actuator 15b for controlling the opening and closing plate 15a. The amount of the reduced iron-containing reducing agent flowing into the charging hopper 25 from the storage device 11 is adjusted by using the open / close valve 15 as described above.

The charging hopper 25 is positioned above the gap between the pair of forming rolls 20 to charge the reducing iron-containing reducing body between the pair of forming rolls 20. In this way, by charging the reduced-reducing iron-containing reducing body continuously using the charging hopper 25, a large amount of compacted material can be continuously produced using the pair of forming rolls 20.

The pair of forming rolls 20 is composed of two forming rolls 20a and 20b, which are connected to the charging device 11 positioned at the top to press the reduced-reducing iron-containing reducing body charged from the charging device 11. . Since the two forming rolls 20a and 20b rotate downwards in opposite directions to each other, the compacted iron-containing reducing body can be pressed to produce a continuously compacted compact. In particular, the first forming roll 20a of the pair of forming rolls 20 is fixedly installed, and the second forming roll 20b of the pair of forming rolls 20 is fixed in order to prevent failure due to a large amount of reduced iron containing reducing bodies. 27) is installed in a movable type so as to support the shaft and move in the horizontal direction with respect to the first forming roll 20a. Accordingly, even when a large amount of reduced iron containing reducing bodies are charged, the second forming roll 20b can be elastically displaced in the horizontal direction of the first forming roll 20a, so that a compacted material can be continuously produced.

The acid formed on the surface of the first forming roll (20a) and the acid formed on the surface of the second forming roll (20b) is preferably made to produce a corrugated compacted body by operating the forming roll (20). Accordingly, the compacted material can be easily crushed in a subsequent process. When manufacturing a compacted body by such a method, productivity is improved by increasing the volume with respect to the width direction of a shaping | molding roll. The corrugated compacted body thus produced is guided through the guide chute 29 and roughly crushed in the crusher 30. The guide chute 29 guides the compacted body produced by the forming roll 20 to the crusher 30 continuously without interruption.

In the crusher 30, the compacted material is roughly crushed. The compacted compact can be crushed to have an average particle diameter of 50 mm or less. Here, in the case where the average particle diameter of the corrugated compacted body is crushed to exceed 50 mm, the second crusher 40 may be subjected to heavy loads, and thus there is a risk of failure, so that the average particle diameter is crushed to 50 mm or less. In this way, the average particle diameter of the corrugated compacted material is crushed to be 50 mm or less, and is produced in an amorphous form so as to be suitable for use in the melt gasification furnace of the subsequent process.

The coarsely crushed compacts are introduced into the second crusher 40 and crushed again. By connecting the second crusher 40 to the rear end of the crusher 30, after the coarse compacted body is roughly crushed in the crusher 30, the compacted crushed compact in the second crusher 40 is again crushed to Adjust the particle size distribution.

The second crusher 40 adjusts the particle size distribution of the compacted material by crushing the roughly crushed compacted material again using a pair of crushing rolls. The second crusher 40 includes a pair of crushing rolls 40a and 40b spaced apart from each other. The pair of crushing rolls 40a and 40b may be made of an integral body or separated into discs.

When the compacted material having a proper particle size is charged into the molten gasifier, the compacted material is supplied to the molten gasifier to maintain proper meltability and breathability during melting and slagging, as well as melt gasification. The oxygen tuyere attached to the lower part of the furnace can be prevented from being melted. As a result, the efficiency and productivity of the molten iron manufacturing process can be improved.

Hereinafter, the structure of the crusher 30 provided in the compacted material manufacturing apparatus 100 according to an embodiment of the present invention will be described in more detail with reference to FIGS. 2 to 3. The structure of this shredder 30 is merely to illustrate the present invention, but the present invention is not limited thereto.

2 is a perspective view of a crusher 30 of the iron reducing iron-containing compacted material manufacturing apparatus according to an embodiment of the present invention. As illustrated, the crusher 30 has a shaft 32 having a cooling passage 32a and a protrusion 34b formed on an outer circumferential surface thereof, and a roll 34 surrounding the shaft 32 and coupled to the shaft 32. It includes. In the present embodiment, the roll 34 is composed of a one body, the roll 34 is made of an integral body, so that the roll 34 is easy to repair and repair, and has little advantage in breaking.

The roll 34 includes a shoulder 34a surrounding the shaft 32, and the protrusions 34b are arranged by being spaced apart from each other along the longitudinal direction of the shaft 32 on the shoulder 34a. These rows of protrusions 34b are arranged along the circumference of the roll 34 at regular intervals from each other. The protrusion 34b has a substantially rectangular cross-sectional shape, and a wear resistant coating film is formed on the surface of the protrusion 34b to prevent wear.

3 is a schematic diagram of a roll 34 for explaining a flow path formed in the shaft 32. As shown, the projection 34b is disposed in an area of a width smaller than the width along the longitudinal direction of the shaft 32 of the shoulder 34a. More specifically, the protrusion 34b is disposed at approximately the center portion of the shoulder 34a, and the protrusion 34b is not disposed at the edge of the shoulder 34a.

In addition, the cooling flow path 32a formed on the outer surface of the shaft 32 is disposed in an area having a wider width than the area in which the protrusion 34b is disposed. That is, the cooling flow path 32a is disposed in a wider width than the portion where the projection 34b is formed. Accordingly, the projection 34b at both ends of the shoulder 34a, which is particularly formed at high thermal stress during operation, is more effectively cooled.

The cooling passage 32a is inserted into the shaft of the shaft 32 and has a shape of surrounding the outer surface of the shaft 32 in the form of a spiral. Accordingly, the coolant flows into the shaft of the shaft 32 and spirally flows between the shaft 32 and the shoulder 34a to cool the protrusion 34b, and then is discharged in the direction opposite to the shaft of the introduced shaft 32. .

On the other hand, a groove 34c is formed between the projections 34b of the shoulder 34a to absorb deformation of the thermal expansion of the projections 34b due to high temperatures during operation. At this time, the groove 34c may be formed to have a substantially rectangular cross-sectional shape.

4 is a view schematically showing a molten iron manufacturing apparatus 1000 according to an embodiment of the present invention, a schematic view showing a process of manufacturing molten iron using a compacted body manufactured by a reduced iron-containing compacted material manufacturing apparatus. .

As shown in FIG. 4, the compacted material adjusted to a constant particle size distribution is supplied to the melt gasifier 70 through the high temperature transfer device 50. The apparatus for manufacturing molten iron 1000 according to an embodiment of the present invention further includes a high temperature transfer device 50 and a melt gasifier 70 in addition to the compacted material manufacturing apparatus 100 described above. The crushed compacted material is supplied to the melt gasifier 70 through a high temperature transfer device 50 that is insulated from the outside so as to be maintained at a high temperature to increase thermal efficiency. Since the structure of the high temperature transfer device 50 can be easily understood by those skilled in the art, detailed description thereof will be omitted.

The melt gasifier 70 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 70 and supplied with oxygen (O 2) to melt the compacted material and then discharge it to the tapping port. In this way, molten iron of good quality can be easily produced.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

According to the compacted material manufacturing apparatus according to the present invention, it is possible to greatly improve the high temperature wear resistance and high temperature tensile strength of the crusher to extend the replacement cycle, thereby reducing the process cost and increasing the process efficiency.

Claims (24)

At least one pair of forming rolls for compressing powdery raw materials to produce compacted material, and Shredder for shredding the compacted material produced in the forming roll Including, The shredder, A shaft having a cooling passage, and Protrusions are provided on the outer peripheral surface, the compact manufacturing apparatus comprising a roll coupled to the shaft and coupled to the shaft. According to claim 1, The roll includes a shoulder surrounding the shaft, The protrusions are arranged on the shoulder spaced apart from each other along the longitudinal direction of the shaft manufacturing apparatus. The method of claim 2, The shoulder is formed between the protrusions and the compacted material manufacturing apparatus comprising a groove for absorbing the heat deformation of the projections. The method of claim 3, wherein And said groove has a substantially rectangular cross-sectional shape. The method of claim 2, And the protrusion is disposed in an area of a width smaller than a width in the longitudinal direction of the shaft of the shoulder. The method of claim 5, The cooling flow path is a compacted material manufacturing apparatus which is disposed in a wider area than the region in which the projection is disposed. The method of claim 6, The cooling passage is inserted into the central axis of the shaft, compacted body manufacturing apparatus for wrapping the shaft in the form of a spiral. According to claim 1, The roll is a compact body manufacturing apparatus consisting of a one body (one body). According to claim 1, The protrusion is a compacted article manufacturing apparatus having a substantially rectangular cross-sectional shape. According to claim 1, The compacted material manufacturing apparatus in which the wear-resistant coating film was formed in the surface of the said processus | protrusion. According to claim 1, The raw material of the powdery phase is a compacted body production apparatus comprising a reduced iron-containing reducing body and a calcined secondary raw material. According to claim 1, And a second crusher for crushing the crushed compacted material in the crusher to control the particle size distribution of the compacted material. Compacted body manufacturing apparatus which compacts raw material of powder, and Melting gas furnace to charge and melt the compacted material produced in the compacted material manufacturing apparatus Including, The compacted material manufacturing apparatus, At least one pair of forming rolls for compressing the reducing iron-containing reducing body to produce compacted material, and Shredder for shredding the compacted material produced in the forming roll Including, The shredder, A shaft having a cooling passage, and A roll having a plurality of protrusions on an outer circumferential surface and surrounding the shaft Iron manufacturing apparatus comprising a. The method of claim 13, The roll includes a shoulder surrounding the shaft, The projections are molten iron manufacturing apparatus is disposed spaced apart from each other along the direction of the shaft on the shoulder. The method of claim 14, The shoulder is molten iron manufacturing apparatus comprising a groove formed between the projections to absorb the heat deformation of the projections. The method of claim 15, The grooves are molten iron manufacturing apparatus formed on both sides of the roll. The method of claim 14, The projections are molten iron manufacturing apparatus disposed on the shoulder area of the width smaller than the width of the shoulder. The method of claim 17, The cooling flow path is molten iron manufacturing apparatus is disposed in a region of a wider width than the region where the projection is arranged. The method of claim 18, The cooling channel is inserted into the central axis of the shaft, molten iron manufacturing apparatus for wrapping the shaft in the form of a spiral. The method of claim 13, The roll is molten iron manufacturing apparatus consisting of a one body (one body). The method of claim 13, The projections are molten iron manufacturing apparatus having a substantially rectangular cross-sectional shape. The method of claim 13, The molten iron manufacturing apparatus formed with a wear-resistant coating film on the surface of the protrusion. The method of claim 13, The raw material of the powdery phase is molten iron production apparatus comprising a reduced iron-containing reducing body and calcined by-product. The method of claim 13, The compacted material manufacturing apparatus, The apparatus for manufacturing molten iron further comprising a second crusher for crushing the compacted material crushed by the crusher to adjust the particle size distribution of the compacted material.

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