KR101545721B1 - Apparatus for manufacturing molten iron and method for manufacturing the same - Google Patents

Abstract

The apparatus for manufacturing molten iron according to the present invention comprises a plurality of reducing furnaces into which iron-containing mixture flows to produce reduced iron, a supply bin connected to a reducing furnace to supply reduced iron, a reduced iron A compression device, and a melter-gasifier furnished with a compacted body to produce molten iron, and includes a combustion section for removing carbon in the reduced iron supplied to the supply bin.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a molten iron manufacturing apparatus,

The present invention relates to a molten iron manufacturing apparatus and a manufacturing method thereof, and more particularly, to an apparatus for manufacturing molten iron using reduced iron reduced by a multistage reduction furnace and a manufacturing method thereof.

The recently developed FINEX process uses powdered iron ore to form a small cast iron shape through a flow path, and bituminous coal powder is made into a small form of coal, which is then put into a melting furnace to extract molten metal.

In the FINEX method, only granular coal is separated from ordinary coal (pulverized coal) and powdered iron ore (coal ore) for the first mining, and then used as it is through the fluidized-bed reactor. Therefore, since the sintering process and the coke production process are not performed, the investment cost of the device is reduced as compared with the conventional furnace, and the problem of environmental pollution is not generated because sulfur oxide and nitrogen oxide which are environmental pollutants are not produced.

And because the material that accounts for most of the world's iron ore reserves is used as raw material, it is free from raw material supply and manufacturing cost is cheaper than conventional furnace construction method.

In such a FINEX process, direct reduced iron (DRI) is supplied to the fluidized-bed reactor in a spectroscopic state, which includes carbon particles.

The carbon particles contained in the reduced iron have a problem of reducing the feeding efficiency of the screw for moving the raw material and deteriorating the productivity, making it difficult to continuously manufacture the carbon particles.

Accordingly, it is an object of the present invention to provide an apparatus for manufacturing molten iron capable of minimizing the reduction of the screw conveyance efficiency due to carbon particles and improving productivity by continuous production, and a method of manufacturing the same.

The apparatus for producing molten iron according to the present invention comprises a plurality of reducing furnaces for introducing iron-containing mixture to produce reduced iron, a supply bin connected to a reducing furnace, connected to a supply bin to supply the reduced iron, And a melter-gasifier furnished with a compacted body to produce molten iron, and the supply bin includes a combustion section for generating a flame.

The supply bin may include an inlet through which the reduced iron is introduced and an outlet through which the gas is discharged, and the combustion unit may be located below the inlet.

The supply bin may include an inlet through which the reducing iron is introduced and an outlet through which the gas is discharged. The combustion unit may include a first combustion unit positioned below the inlet, and a second combustion unit positioned adjacent to the exhaust outlet.

The second burner may be located above the supply bin.

And a scraper which rotates and transfers the reduced iron delivered from the supply bin to the reduced iron compactor.

According to another embodiment of the present invention, there is provided a method of manufacturing molten iron according to another embodiment of the present invention, which comprises the steps of producing a reduced iron by supplying an iron-containing mixture to a reducing furnace, removing carbon from the reduced iron, supplying the reduced iron, Compressing the reduced iron to produce a compacted material, and melting the compacted material to produce molten iron.

The step of removing the carbon and the step of supplying the reduced iron may be simultaneously carried out in a supply bin connected with the reducing furnace.

The step of removing the carbon may be performed at 1000 ° C to 1300 ° C.

The reduced iron may be dropped and rotated in the supply hopper by a speed supplied to the supply hopper and supplied to the reduction iron compression apparatus.

When molten iron is manufactured as in the present invention, it is possible to prevent the screw conveyance efficiency from being deteriorated due to impurities such as carbon.

Therefore, by continuously injecting the compacted material into the melting furnace to produce molten iron, the productivity is improved.

FIG. 1 is a schematic configuration diagram of a molten iron manufacturing apparatus according to an embodiment of the present invention.
2 is a schematic cross-sectional view of a supply bin according to an embodiment of the present invention.
3 is a flowchart for explaining a method of manufacturing molten iron according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Wherever possible, the same or similar parts are denoted using the same reference numerals in the drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

FIG. 1 is a schematic structural view of a molten iron manufacturing apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of a supply bin according to an embodiment of the present invention.

1, the apparatus for manufacturing molten iron 100 of the present embodiment includes a melter-gasifier 300, a plurality of fluidized-bed reduction reactors (hereinafter referred to as a reduction furnace) 110, and a reduced-iron compactor 400 . Here, the compressed reduced iron storage tank can be omitted. In addition, the molten iron manufacturing apparatus 100 may include other devices as required.

The dryer 60 is for drying the ore supplied to the reduction furnace 110. The ore may be an iron-containing mixture, for example, iron ore or coal, obtained from the raw material for producing the molten iron and the raw material for pulverization. At this time, iron ore can be used as iron ore, and if necessary, it can be used by mixing subsidiary materials such as limestone and dolomite.

The reducing furnace 110 receives the iron-containing mixture dried through the dryer, reduces the iron-containing mixture in multiple stages, and discharges the reduced iron-containing mixture to the supply bin 200. In the reducing furnace 110, a plurality of reducing furnaces can be connected in series by a connecting pipe, and the iron-containing mixture is reduced to a multi-stage by a plurality of reducing furnaces.

For example, when three reducing furnaces 110 are connected as shown in FIG. 1, the reducing furnace is composed of a first reducing furnace in which an iron-containing mixture for producing molten iron is first reduced, a second reducing furnace in which a first reduced iron- And a final reducing furnace for finally reducing the second reducing furnace and the second reduced iron-containing mixture for reducing iron by the reduced iron.

Each reduction furnace may be connected by a connecting pipe.

In FIG. 1, three reduction furnaces 110 are shown and reduced to multi-stages. However, the present invention is not limited to this, and one or more fluidized-bed reactors may be used. 1 shows a fluidized-bed reactor, this is for the purpose of illustrating the present invention, and the present invention is not limited thereto, and other kinds of reducing furnaces may be used.

The supply bin 200 stores a reduced iron reduced through a reduction furnace. The supply bin 200 includes an inclined surface, and the reduced metal can be discharged to the outside using an inclined surface. In this case, the reduced iron can be discharged in various directions (not shown) through a plurality of outlets (not shown) located on the lower side.

Specifically, as shown in FIG. 2, the supply bin 200 includes an inlet 27 through which the reduced iron enters the reducing furnace 110 and an exhaust 29 through which the gas is discharged. The supply bin may include a first combustion section 31 located below the inlet port and a second combustion section 33 located adjacent to the exhaust port 29. [

The first combustion section 31 and the second combustion section 33 are for removing carbon in the reduced iron and may be in the form of a burner that emits a high-temperature flame at 1000 ° C to 1300 ° C.

The reduced iron flows through the inlet 27 into the supply hopper 200 with a constant initial velocity. Therefore, the reduced iron rotates downward while rotating inside the supply hopper by the rotational force when supplied, and is supplied to the reduction iron compression device.

At this time, the impurities of the reduced iron such as carbon are burned and removed by the first combustion section 31 and the second combustion section 33.

That is, since the first burning unit 31 emits a high-temperature flame toward the reducing iron flowing through the inlet, the reducing iron rotating in the supply bin moves down while removing impurities while passing through the high-temperature flame.

The amount of the supplied reduced iron can be adjusted in consideration of the amount of combustion by the first combustion section 31. [

The second combustion unit 33 is disposed adjacent to the exhaust port 29 through which the gas is discharged to burn the reduced iron at the upper portion of the supply bin.

The thermal power of the first combustion section may be more unstable than the thermal power of the second combustion section, but the combustion rate is higher than that of the second combustion section.

Therefore, only one of the first combustion section 31 and the second combustion section 33 can be provided as needed.

Meanwhile, the reduced iron supplied to the supply bin 200 may be supplied to the reduced iron compactor 400 through a screw.

In the embodiment of the present invention, since the impurities of the reduced iron, particularly the carbon adhered to the screw and lowering the conveying efficiency of the screw, are removed in the supply bin, the conveying efficiency of the screw can be prevented from being deteriorated by impurities such as carbon.

The reduced iron compactor 400 includes a hopper 150 connected to an outlet of the supply bin 200 and including a screw for transferring the reduced iron to the roll, a pair of rolls 150 for compressing and compacting the reduced iron supplied from the hopper 150, (170). The reduced iron compacting apparatus may further include a crusher for crushing the compacted compacts compressed by the rolls to a predetermined size, and a storage tank for temporarily storing crushed compacted compacts and supplying the compacted compacted compacts to the melter-gasifier.

In the melter-gasifier 300, a coal-packed bed is formed by receiving the coal briquettes formed by the molding of coal or pulverized coal. The compacted material is molten using a coal-packed bed as a heat source to produce molten iron.

On the other hand, the high-temperature reducing gas generated by the combustion reaction of oxygen supplied to the melter-gasifier and the coal-packed bed is connected to the downstream end of the final reducing furnace through the reducing gas supply pipe. The high-temperature reducing gas supplied to the final reducing furnace is successively supplied to a reducing furnace connected to the final reducing furnace and used as a reducing agent and a fluidizing gas. At this time, a cyclone may be installed to prevent the fine particles contained in the reducing gas discharged from the melter-gasifier from scattering. The fine particles captured by the cyclone are introduced back into the melter gasifier.

The detailed structure of the melter-gasification furnace can be easily understood by those skilled in the art to which the present invention belongs, so that detailed description thereof will be omitted.

3 is a flowchart for explaining a method of manufacturing molten iron according to an embodiment of the present invention. The molten iron manufacturing method of FIG. 3 uses the molten iron manufacturing apparatus of FIGS. 1 and 2 to manufacture molten iron.

As shown in FIG. 3, the method for producing molten iron according to the present invention comprises the steps of (S100) introducing an iron-containing mixture into a reducing furnace, producing reduced iron (S102), supplying reduced iron to a supply bin (S104), removing carbon (S106), producing a compacted material (S108), and injecting the compacted material into a melter-gasifier to produce molten iron (S110).

That is, the iron-containing mixture dried through the dryer is supplied to the reducing furnace (S100). The mixture may be an iron-containing mixture, for example, iron ore or coal, collected from the mountain, which is the raw material for the pulverization and the pulverization for producing molten iron. At this time, iron ore can be used as iron ore, and if necessary, it can be used by mixing subsidiary materials such as limestone and dolomite.

Thereafter, the mixture supplied to the reduction furnace is reduced to multi-stages by a plurality of reduction furnaces to become reduced iron (S102). Then, the reduced iron is supplied to the supply bin (S104), and the reduced iron is supplied to the supply bin. At the same time, the impurities such as carbon contained in the reduced iron are removed by the first and second burners (S106).

At this time, the first combustion unit and the second combustion unit radiate a flame at a high temperature of 1000 ° C to 1300 ° C to remove carbon in the reduced iron.

The reduced iron from which the impurities have been removed is moved downward while rotating within the supply bins by the speed at which the impurities are removed through the inlet, and is supplied to the reduction iron compacting apparatus to produce compacted bodies (S108).

Then, the compacted material is supplied to the melter-gasifier 300 and melted using the coal-filled layer as a heat source, whereby molten iron can be manufactured (S110).

While the present 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, Of course.

Claims (9)

A plurality of reducing furnaces into which the iron-containing mixture is introduced to produce reduced iron,
A supply bin connected to the reduction furnace to introduce the reduced iron,
A reducing iron compression device connected to the supply bin to compress the reduced iron to produce compacted irons,
And a molten gasification furnace
Lt; / RTI >
Wherein the supply bin includes a combustion portion for removing carbon in the reduction iron. The method of claim 1,
Wherein the supply bin includes an inlet through which the reduced iron is introduced and an outlet through which the gas is discharged,
And the combustion section is located below the inlet. The method of claim 1,
Wherein the supply bin includes an inlet through which the reduced iron is introduced and an outlet through which the gas is discharged,
Wherein the combustion section includes a first combustion section positioned below the inlet, and a second combustion section positioned adjacent to the outlet. 4. The method of claim 3,
And the second combustion unit is located above the supply bin. 5. The method of claim 4,
And a scraper which rotates and transfers the reduced iron delivered from the supply bin to the reduced iron compacting device. Feeding the iron-containing mixture to a reducing furnace to produce reduced iron,
Removing the carbon of the reduced iron,
Supplying the reduced iron from which the carbon has been removed to a reduced iron compacting apparatus,
Compressing the reduced iron to produce a compacted material,
Melting the compacted material to produce molten iron
≪ / RTI > The method of claim 6,
The step of removing the carbon and the step of supplying the reduced iron
And simultaneously in a supply bin connected to the reduction furnace. 8. The method of claim 7,
Wherein the step of removing the carbon is performed at a temperature of 1000 ° C to 1300 ° C. 8. The method of claim 7,
Wherein the reduced iron falls while rotating within the supply bin at a speed supplied to the supply bin and is supplied to the reduced iron compression device.

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