EP2883968A1

EP2883968A1 - Direct-reduced iron agglomeration apparatus

Info

Publication number: EP2883968A1
Application number: EP13810023.5A
Authority: EP
Inventors: Myung-Chan Shin; Do-Seung Kim; Jae-Hoon Jung; Young-Bae HA
Original assignee: Posco Co Ltd
Current assignee: Posco Holdings Inc
Priority date: 2012-06-27
Filing date: 2013-05-15
Publication date: 2015-06-17
Also published as: CN104271780B; KR101424609B1; CN104271780A; WO2014003316A1; KR20140001524A; EP2883968A4

Abstract

Disclosed is a direct-reduced iron agglomeration apparatus. According to the present invention, the direct-reduced iron agglomeration apparatus includes: a feeding box which is installed above a pair of rolls, and supplies direct reduced iron, which is supplied by double screw feeders, between the pair of rolls; cheek plates which are installed at side portions of the pair of rolls, respectively, and prevent the direct reduced iron from being pushed out by pressure by the pair of rolls in a side direction of the rolls; and a shut-off unit which is coupled to the feeding box, and blocks the direct reduced iron from being pushed out by pressure by the pair of rolls toward a middle portion of the rolls.

Description

[Technical Field]

The present invention relates to a direct-reduced iron agglomeration apparatus, and more particularly, to a direct-reduced iron agglomeration apparatus, in which a shut-off plate is installed in a feeding box, thereby obtaining production of a double screw type direct-reduced iron agglomeration apparatus, and assuring supply characteristics similar to those in a single screw type direct-reduced iron agglomeration apparatus based on the left and right sides of a roll.

[Background Art]

Recently, as a method of manufacturing molten iron, a direct iron ore smelting reduction process, which is substituted for a blast furnace process, is being developed.
In the direct iron ore smelting reduction process, the molten iron is manufactured by manufacturing hot compacted iron (HCl) using direct reduced iron (DRI) passing through a flow path, and loading the hot compacted iron into a gasification melting furnace.
That is, pressure is applied to the direct reduced iron in the form of powder in a temperature range of approximately 700°C to 800°C to make lumpy reduced iron, and the reduced iron is supplied to the gasification melting furnace.
When the hot compacted iron is manufactured using the direct reduced iron as described above, a direct-reduced iron agglomeration apparatus is used.
A feeding box of the direct-reduced iron agglomeration apparatus is installed below a loading hopper, and serves to supply direct reduced iron (DRI), which is supplied by a screw feeder from the loading hopper, between a pair of rolls.
In order to improve productivity, the direct-reduced iron agglomeration apparatus applies a double screw type screw feeder by changing the existing single screw type screw feeder to the double screw type screw feeder.
That is, production of the direct-reduced iron agglomeration apparatus having the double screw type screw feeder is increased two times as much in comparison with production of the direct-reduced iron agglomeration apparatus having the existing single screw type screw feeder. Sealing property in the single screw type screw feeder is excellent due to a closed and sealed space that is made by blocking the left and right sides of the screw by a cheek plate. In the double screw type screw feeder, left and right end portions are sealed like the single screw type screw feeder, but there is no shut-off member at a middle portion between left and right screws, and as a result, there is a problem in that a manufacturing process is frequently stopped due to discharge of the direct reduced iron caused by a relatively vulnerable sealing structure during a continuous manufacturing process.
In order to form the direct reduced iron, about 2.0 of the density of the direct reduced iron needs to be increased to 4.0 or more after compression forming so that plastic forming is performed.
On the contrary, when production is not continuously performed during a process, gas is emitted at a roll width center, and the direct reduced iron is discharged due to a flow speed of gas, and as a result, there is a problem in that compression forming is not performed because density of the direct reduced iron is instantaneously dropped to a minimally required amount or less in the closed and sealed space formed by the screws, the cheek plates, and the rolls, or there is a problem in that a roll middle portion is vulnerable to the compression forming because amounts of pressurization are different in accordance with rotational directions of the screws when two or more screws are used, or a phenomenon in which the screws lean toward sides becomes severe.
In the case of a broad width type direct-reduced iron agglomeration apparatus having the double screw type screw feeder which has been developed to improve production of the direct-reduced iron agglomeration apparatus, maximum production is increased, but a possibility of the problem regarding discontinuous production is also increased due to characteristics of the broad width type direct-reduced iron agglomeration apparatus. Therefore, development of the direct-reduced iron agglomeration apparatus, which may solve the possibility of the problem regarding discontinuous production while assuring the merit of the broad width type direct-reduced iron agglomeration apparatus, is greatly required.
The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

[DISCLOSURE]

[Technical Problem]

The present invention has been made in an effort to provide a direct-reduced iron agglomeration apparatus, in which a shut-off plate is installed in a feeding box, thereby obtaining production of a double screw type direct-reduced iron agglomeration apparatus, and assuring supply characteristics similar to those in a single screw type direct-reduced iron agglomeration apparatus based on the left and right sides of a roll.

[Technical Solution]

An exemplary embodiment of the present invention provides a direct-reduced iron agglomeration apparatus, including:

a feeding box which is installed above a pair of rolls, and supplies direct reduced iron, which is supplied by double screw feeders, between the pair of rolls;
cheek plates which are installed at side portions of the pair of rolls, respectively, and prevent the direct reduced iron from being pushed out by pressure by the pair of rolls in a side direction of the rolls; and
a shut-off unit which is coupled to the feeding box, and blocks the direct reduced iron from being pushed out by pressure by the pair of rolls toward a middle portion of the rolls.

The shut-off unit may be installed at a middle portion between the cheek plates.
A coupling hole to which the shut-off unit is separably coupled may be formed in a middle portion of an upper end portion of the feeding box.
The coupling hole may be formed in a narrow elongated slit shape.
The shut-off unit may include: a shut-off plate which is inserted into and coupled to the coupling hole of the feeding box, and blocks the direct reduced iron from being pushed out toward the middle portion of the rolls; and
a stopper which is formed on an upper end portion of the shut-off plate, and stops the insertion of the shut-off plate when the shut-off plate is fully inserted into the coupling hole.
A curved portion, which is formed in a streamlined shape and allows the shut-off plate to be easily inserted into the coupling hole, may be formed at a lower end portion of the shut-off plate.
The stopper may be formed to be greater than at least the coupling hole.
The stopper may protrude outward from both surfaces of the upper end portion of the shut-off plate in order to effectively stop the insertion of the shut-off plate.
The shut-off plate may have the same shape as the coupling hole.

[Advantageous Effects]

According to the present exemplary embodiment, the shut-off plate is installed in the feeding box, thereby obtaining production of a double screw type direct-reduced iron agglomeration apparatus, and assuring supply characteristics similar to those in a single screw type direct-reduced iron agglomeration apparatus based on the left and right sides of a roll.

[Description of the Drawings]

FIG. 1 is a schematic front perspective view illustrating a direct-reduced iron agglomeration apparatus according to an exemplary embodiment of the present invention.
FIG. 2 is a schematic side perspective view illustrating the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention.
FIG. 3 is a partially exploded perspective view illustrating the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention.
FIG. 4 is a partially coupled perspective view illustrating the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention.
FIG. 5 is a bottom perspective view of FIG. 4.
FIG. 6 is a top plan view illustrating a feeding box of the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention.
FIG. 7 is a perspective view illustrating an assembled state of a shut-off unit of the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention, which illustrates a state in which the shut-off unit is positioned above a coupling hole of the feeding box.
FIG. 8 is a perspective view illustrating an assembled state of the shut-off unit of the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention, which illustrates a state in which the shut-off unit is coupled to the coupling hole of the feeding box.
FIG. 9 Is a perspective view illustrating an assembled state of the shut-off unit of the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present Invention, which illustrates a state in which the shut-off unit is separated from an upper portion of the coupling hole of the feeding box.
FIGS. 10A and 10B are views illustrating simulation results regarding whether roll force applied in a downward direction from a roll is generated uniformly in the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention, which compare the case (a) in the related art in which a shut-off plate is not installed, and the case (b) in which the shut-off plate is installed.

[Mode for Invention]

The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.
FIG. 1 is a schematic front perspective view illustrating a direct-reduced iron agglomeration apparatus according to an exemplary embodiment of the present invention, FIG. 2 is a schematic side perspective view illustrating the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention, FIG. 3 is a partially exploded perspective view illustrating the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention, FIG. 4 is a partially coupled perspective view illustrating the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention, FIG. 5 is a bottom perspective view of FIG. 4, and FIG. 6 is a top plan view illustrating a feeding box of the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention.
Referring to FIGS. 1 to 6, the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention may include: a feeding box 300 which is installed above a pair of rolls 100 and 110, and supplies direct reduced iron (DRI), which is supplied by double screw feeders 200 and 210, between the pair of rolls 100 and 110;
cheek plates 400 and 410 which are installed at side portions of the pair of rolls 100 and 110, respectively, and prevent the direct reduced iron from being pushed out by pressure by the pair of rolls 100 and 110 in a side direction of the rolls; and
a shut-off unit 500 which is coupled to the feeding box 300, and blocks the direct reduced iron from being pushed out by pressure by the pair of rolls 100 and 110 toward a middle portion of the rolls.
In order to effectively block the direct reduced iron from being pushed out toward the middle portion of the rolls 100 and 110, the shut-off unit 500 may be installed at a middle portion of the feeding box 300, that is, a middle portion between the cheek plate 400 and the cheek plate 410.
In addition, a coupling hole 310 to which the shut-off unit 500 may be separably coupled may be formed in a middle portion of an upper end portion of the feeding box 300.
The coupling hole 310 may be formed in a narrow elongated slit shape so that the shut-off unit may be securely coupled to the coupling hole 310.
First and second supply ports 320 and 330 may be formed in the feeding box 300 so as to supply the direct reduced iron from the double screw feeders 200 and 210 to the first and second supply ports 320 and 330.
In addition, the shut-off unit 500 may include: a shut-off plate 510 which is inserted into and coupled to the coupling hole 310 of the feeding box 300, and blocks the direct reduced iron from being pushed out toward the middle portion of the rolls 100 and 110; and
a stopper 520 which is formed on an upper end portion of the shut-off plate 510, and stops the insertion of the shut-off plate 510 when the shut-off plate 510 is fully inserted into the coupling hole.
The shut-off plate 510 may be formed in an approximately quadrangular shape so as to easily block the direct reduced iron, and may have the same shape as the coupling hole 310.
In addition, a curved portion 530, which is formed in a streamlined shape and allows the shut-off plate 510 to be easily inserted into the coupling hole 310, may be formed at a lower end portion of the shut-off plate 510.
The curved portion 530 may have a center identical to a center in a width direction of the shut-off plate 510, and a predetermined curvature radius so as to allow the shut-off plate 510 to be more easily inserted into the coupling hole 310.
In addition, in order to surely stop the insertion of the shut-off plate 510, the stopper 520 may be formed to be greater than at least the coupling hole 310.
In order to effectively stop the insertion of the shut-off plate 510, the stopper 520 may protrude outward from both surfaces of the upper end portion of the shut-off plate 510.
Hereinafter, an operation according to the exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 6.
First, when the shut-off unit 500 is assembled to the feeding box 300, the shut-off plate 510 of the shut-off unit 500 is positioned above the coupling hole 310 of the feeding box 300, as illustrated in FIG. 7.
In this state, the curved portion 530 of the shut-off unit 500 is pushed from the upper side toward the lower side of the feeding box 300, as indicated by the arrow in FIG. 8, and inserted into the coupling hole 310, and then the shut-off plate 510 is fully inserted into and coupled to the coupling hole 310, as illustrated in FIG. 8, and as a result, the stopper 520 of the shut-off unit 500 is caught by the upper end portion of the feeding box 300 such that the insertion of the shut-off plate 510 into the coupling hole 310 is stopped.
In a state in which the shut-off unit 500 has been inserted into and coupled to the coupling hole 310 of the feeding box 300 as described above, the direct reduced iron, which is supplied by the double screw feeders 200 and 210, is supplied to the feeding box 300, and thereafter supplied between the pair of rolls 100 and 110 through the supply ports 320 and 300.
In this case, the cheek plates 400 and 410 prevent the direct reduced iron supplied between the pair of rolls 100 and 110 from being pushed out in a side direction of the rolls 100 and 110 by pressure of the pair of rolls 100 and 110 that are rotated in opposite directions.
In addition, the shut-off plate 510 of the shut-off unit 500 blocks the direct reduced iron from being pushed out by pressure of the pair of rolls 100 and 110 toward the middle portion of the rolls 100 and 110.
As described above, the direct reduced iron may be blocked by the cheek plates 400 and 410 from being pushed out at both end portions of the double screw feeders 200 and 210, and the direct reduced iron may be blocked by the shut-off plate 510 of the shut-off unit 500 from being pushed out toward the middle portion of the rolls 100 and 110 at the middle portion of the double screw feeders 200 and 210.
In addition, as illustrated in FIG. 8, when the shut-off unit 500 is separated from the feeding box 300 after being used in a state in which the shut-off unit 500 is assembled to the feeding box 300, force is applied to the curved portion 530 of the shut-off unit 500 from the lower side toward the upper side of the shut-off unit 500 as indicated by the arrow in FIG. 9, such that the shut-off plate 510 is separated from the coupling hole 310 of the feeding box 300 as illustrated in FIG. 9, and as a result, the shut-off unit 500 is completely separated from the feeding box 300.
In addition, FIGS. 10A and 10B are views illustrating simulation results regarding whether roll force applied in a downward direction from the roll is generated uniformly in the direct-reduced iron agglomeration apparatus according to the exemplary embodiment of the present invention, which compare the case (a) in the related art in which the shut-off plate is not installed, and the case (b) in which the shut-off plate is installed.
That is, a particle behavior simulation is used to analyze a conveying effect before and after the shut-off plate is installed in the feeding box, and it can be seen that as a result of calculating mutual reaction force between particles before and after the shut-off plate is installed, roll force,applied in a downward direction from the roll is generated more uniformly from side to side in the case in which the shut-off plate is installed in comparison with a case in the related art in which the shut-off plate is not installed.
While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

A direct-reduced iron agglomeration apparatus, comprising:
a feeding box which is installed above a pair of rolls, and supplies direct reduced iron, which is supplied by double screw feeders, between the pair of rolls;

cheek plates which are installed at side portions of the pair of rolls, respectively, and prevent the direct reduced iron from being pushed out by pressure by the pair of rolls in a side direction of the rolls; and

a shut-off unit which is coupled to the feeding box, and blocks the direct reduced iron from being pushed out by pressure by the pair of rolls toward a middle portion of the rolls.
The direct-reduced iron agglomeration apparatus of claim 1, wherein,
the shut-off unit is installed at a middle portion between the cheek plates.
The direct-reduced iron agglomeration apparatus of claim 2, wherein,
a coupling hole to which the shut-off unit is separably coupled is formed in a middle portion of an upper end portion of the feeding box.
The direct-reduced iron agglomeration apparatus of claim 3, wherein,
the coupling hole is formed in a narrow elongated slit shape.
The direct-reduced iron agglomeration apparatus of claim 4, wherein,
the shut-off unit includes:
a shut-off plate which is inserted into and coupled to the coupling hole of the feeding box, and blocks the direct reduced iron from being pushed out toward the middle portion of the rolls; and

a stopper which is formed on an upper end portion of the shut-off plate, and stops the insertion of the shut-off plate when the shut-off plate is fully inserted into the coupling hole.
The direct-reduced iron agglomeration apparatus of claim 5, wherein,
a curved portion, which is formed in a streamlined shape and allows the shut-off plate to be easily inserted into the coupling hole, is formed at a lower end portion of the shut-off plate.
The direct-reduced iron agglomeration apparatus of claim 5, wherein,
the stopper is formed to be greater than at least the coupling hole.
The direct-reduced iron agglomeration apparatus of claim 7, wherein,
the stopper protrudes outward from both surfaces of the upper end portion of the shut-off plate in order to effectively stop the insertion of the shut-off plate.
The direct-reduced iron agglomeration apparatus of claim 5, wherein,
the shut-off plate has the same shape as the coupling hole.