CN110168112A - Molten iron manufacturing apparatus and process for producing molten iron - Google Patents
Molten iron manufacturing apparatus and process for producing molten iron Download PDFInfo
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- CN110168112A CN110168112A CN201780082502.5A CN201780082502A CN110168112A CN 110168112 A CN110168112 A CN 110168112A CN 201780082502 A CN201780082502 A CN 201780082502A CN 110168112 A CN110168112 A CN 110168112A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0086—Conditioning, transformation of reduced iron ores
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
- C21B13/143—Injection of partially reduced ore into a molten bath
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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- Environmental & Geological Engineering (AREA)
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- Manufacture Of Iron (AREA)
Abstract
A kind of molten iron manufacturing apparatus according to the present invention, comprising: Reduction on Fluidized Bed furnace, the Reduction on Fluidized Bed furnace is by carrying out also original manufacture reduced iron to Iron Ore Powder；Melting gasification furnace, the melting gasification furnace receive the reduced iron from Reduction on Fluidized Bed furnace, and pass through the inside that oxygen is sucked to melting gasification furnace and make reduced iron fusing to manufacture molten iron；And cold pig iron bunker, the cold pig iron that cold pig iron bunker storage is manufactured and making the molten steel solidification manufactured in melting gasification furnace, and cold pig iron is introduced into melting gasification furnace.In this way, according to an embodiment of the invention, reduced iron can be made to melt at a temperature of the temperature than routine techniques is low and cold pig iron is introduced into melting gasification furnace.That is, the fusing point of reduced iron due to cold pig iron introducing and reduce so that reduced iron starts to melt at a temperature of the temperature than routine techniques is low.In this way, it does not generate unfused reduced iron in melting gasification furnace or minimizes the unfused reduced iron in melting gasification furnace, thus the problem of preventing the increase of the increase of such as discharge of the molten iron due to caused by unfused reduced iron deviation, the unstability of the circulation of reducing gas and fuel cost.
Description
Technical field
This disclosure relates to the device and method for producing molten steel, and relate more specifically to improve the meltability of reduced iron
For producing the device and method of molten steel.
Background technique
A kind of equipment for producing molten steel includes: Reduction on Fluidized Bed furnace, and the Reduction on Fluidized Bed furnace is for going back iron ore
It is former；Forming device, the forming device are used to for the iron ore through restoring being compacted；And melting-gasification furnace, the melting-gasification furnace
For melting the reduced iron through being compacted to produce molten steel.When as heat source coal briquette and reduced iron be fed into melting-gas
Change the upside of furnace and oxygen is blown into melting-gasification furnace downside for when melting reduced iron, reduced iron to pass through coal pressure
Interaction between block and oxygen and soften and melt to produce molten steel.
However, the reduced iron with high reduction percentage and containing secondary raw material has lower meltability.In addition, molten
Melt-gasification furnace in high reducing atmosphere inhibit the formation of low melting point slag.This leads to unfused reduced iron, and unfused
Reduced iron drop to melting-gasification furnace downside, this cause molten steel be discharged deviation.
In addition, when further increasing generation of melting-gasification furnace temperature to prevent unfused reduced iron, required combustion
Material will increase.
Therefore, in order to solve the problems, as disclosed at South Korea patent application bulletin the 2000-0039376th
, sludge can be mixed to form mixture with the reduced iron produced in Reduction on Fluidized Bed furnace, and mixture can be in melting-
It is melted in gasification furnace.Alternatively, as disclosed at South Korea patent application bulletin the 2003-0054281st, converter slag
The slag for producing high-quality in melting-gasification furnace in melting-gasification furnace can be supplied to together with reduced iron.
However, in the above-mentioned methods, the amount of the slag in melting-gasification furnace increases, and therefore, the combustion for melting slag
Expect increased costs.In addition, these methods are to the no direct effect of the fusing of height reduced iron, therefore its effect is unobvious.
In addition, these methods mainly mix sludge or converter slag with reduced iron so that reduced iron shapes.This makes to shape
The productivity of unit reduces and the intensity of the reduced iron through being compacted is made to be deteriorated.In addition, being melted when the intensity of reduced iron is lower
Melt-gasification furnace in permeability deterioration, this reduces the meltability of reduced iron.
[existing technical literature]
(patent document 1) South Korea patent application bulletin 2000-0039376
Summary of the invention
Technical purpose
The disclosure provides a kind of device and method for being used to produce molten steel of meltability that reduced iron can be improved.
The disclosure provide it is a kind of can improve reduced iron in the case where not adding any additive into reduced iron can
The device and method for being used to produce molten steel of fusibleness.
Technical solution
On the one hand, a kind of molten steel production equipment is provided, which includes: Reduction on Fluidized Bed furnace, the Reduction on Fluidized Bed
Furnace is for restoring to produce reduced iron fine iron ore；Melting-gasification furnace, the melting-gasification furnace is for receiving to flow automatically
Change the reduced iron of reduction furnace, and oxygen is blown into melting-gasification furnace so that reduced iron melts, to produce molten steel；And it is cold
Pig iron bunker, the cold pig iron bunker produce cold pig iron for making the molten steel solidification produced in melting-gasification furnace and by cold lifes
Iron is stored in cold pig iron bunker, and cold pig iron is supplied in melting-gasification furnace by the cold pig iron bunker from cold pig iron bunker.
In an embodiment of molten steel production equipment, molten steel production equipment further include: forming unit, the forming unit
For shaping the reduced iron produced in Reduction on Fluidized Bed furnace and compacting；
Feeding warehouse, the feeding warehouse are arranged in above melting-gasification furnace, and the feeding warehouse stores the reduced iron through being compacted
It is supplied in melting-gasification furnace in feeding warehouse, and by the reduced iron through being compacted；Feed line, the feed line have
It is connected to one end of forming unit and is connected to the other end of feeding warehouse；And cold pig iron supply line, cold pig iron supply line tool
There is the one end for being connected to cold pig iron bunker and is connected to the other end of feed line.
In an embodiment of molten steel production equipment, molten steel production equipment further include: drier, the drier are used for
Moisture is removed from the cold pig iron produced and making molten steel solidification, to produce dry cold pig iron.
Dry cold pig iron is stored in cold pig iron bunker by cold pig iron bunker.
In an embodiment of molten steel production equipment, molten steel production equipment further include: gas feed line, gas supply
Line, which has, to be connected to one end of forming unit and is connected to the other end of drier.Gas feed line is being fluidized to drier supply
The gas that the reduced iron of reduction furnace moves together when mobile to forming unit.
On the one hand, a kind of method for producing molten steel is provided, this method comprises: being restored fine iron ore to produce
Reduced iron；Reduced iron is set to shape and be compacted；And the reduced iron through being compacted is supplied in melting-gasification furnace so that melting-gas
Change the reduced iron fusing in furnace, to produce molten steel.Making reduced iron fusing includes: the molten steel for making to produce in melting-gasification furnace
Solidification is to produce cold pig iron；And cold pig iron is supplied in melting-gasification furnace.
In an embodiment of this method, cold pig iron is supplied in melting-gasification furnace include: by coal briquette with it is cold
The pig iron is supplied to together in melting-gasification furnace.
In an embodiment of this method, this method further include: it is dry to produce to remove moisture from the cold pig iron of production
Dry cold pig iron.Dry cold pig iron is supplied in melting-gasification furnace.
In an embodiment of this method, cold pig iron and reduced iron are supplied in melting-gasification furnace, so that cold life
The ratio of the quality of the quality relative reduction iron of iron is equal to or less than 0.062.
In an embodiment of this method, cold pig iron is done using gas generated when fine iron ore is reduced
It is dry.
In an embodiment of this method, cold pig iron is supplied in melting-gasification furnace includes:
By by the cold pig iron of the molten steel production for meeting target component content in the molten steel that is produced in melting-gasification furnace with
The cold pig iron mixing of the molten steel production except target component content in the molten steel produced in melting-gasification furnace, thus raw
Produce mixture；And mixture is supplied in melting-gasification furnace.
Technical effect
According to the embodiment of the disclosure, cold pig iron can be supplied in melting-gasification furnace, reduced iron is existed
It is melted at temperature more lower than the temperature of the prior art.That is, reducing the fusing point of reduced iron by supplying cold pig iron, make
Reduced iron is obtained to start to melt at temperature more lower than the prior art.Therefore, unfused go back is not generated in melting-gasification furnace
Former iron minimizes the unfused reduced iron in melting-gasification furnace, so that the aggravation of such as molten steel discharge deviation, reduction
The unstability of gas circulation, fuel cost increase the problems such as available prevent.
In addition, the molten steel except target component content in the molten steel produced in melting-gasification furnace be produced as it is cold
It the pig iron and is fed into melting-gasification furnace and is recycled during reduced iron production, so that molten steel production cost reduces.
Detailed description of the invention
Fig. 1 is the concept map according to the equipment for producing molten steel of the embodiment of the disclosure.
Fig. 2 is the flow chart for illustrating the method for producing molten steel of the embodiment according to the disclosure.
Specific embodiment
Hereinafter, the embodiment of the disclosure is described in detail with reference to the accompanying drawings.However, the present disclosure is not limited under
Embodiment disclosed in face, but can be implemented in the form of a variety of different.The embodiment for providing the disclosure is only used for completely
Ground understands the disclosure and those of ordinary skill in the art is made completely to recognize the scope of the present invention.Identical appended drawing reference in attached drawing
Indicate identical element.
Fig. 1 is the concept map according to the equipment for producing molten steel of the embodiment of the disclosure.In addition, Fig. 2 is diagram
According to the flow chart of the method for producing molten steel of the embodiment of the disclosure.
It referring to Fig.1, include: multiple Reduction on Fluidized Bed furnaces according to the equipment for producing molten steel of the embodiment of the disclosure
10,11,12,13,14, it is used to restore iron ore to produce reduced iron (DRI)；Forming unit 30, be used to making from
The received thin reduced iron of Reduction on Fluidized Bed furnace 10 is shaped and is compacted to form hot compaction iron (HCI)；Melting-gasification furnace 20, is used for
Make to melt from the received reduced iron of forming unit 30 to produce molten steel；Drier 500 is used for by using in melting-gas
The cold pig iron changing the molten steel produced in furnace 20 and producing is dried；And cold pig iron bunker 600, it is used to temporarily store through dry
Dry cold pig iron, and when reduced iron melts in melting-gasification furnace 20, cold pig iron bunker 600 is by a certain amount of cold pig iron
Supply or be supplied to melting-gasification furnace 20.
Furthermore, further includes: feeding warehouse 20a is arranged in the top of melting-gasification furnace 20 and by the reduction iron supply through being compacted
Into melting-gasification furnace 20；Feed line 30a is used to feed the reduced iron being compacted in forming unit 30 to charging
Storehouse；Cyclone 80 makes the reducing gas circulation being discharged from melting-gasification furnace 20, then supplies reducing gas again to molten
Melt-gasification furnace or the 4th Reduction on Fluidized Bed furnace 14；And carbon dioxide (CO2) remover 70, it is mounted on from Reduction on Fluidized Bed furnace 11
To remove removing carbon dioxide from exhaust on the discharge path of the exhaust of discharge, and the exhaust for eliminating carbon dioxide is supplied to eddy flow
Device 80.
It include: to be gone back to fine iron ore according to the method for producing molten steel of the embodiment of the disclosure referring to Fig. 2
Original is to produce reduced iron S110；Reduced iron is set to shape and be compacted S120；Melt the reduced iron through being compacted to produce molten steel S130；
S140 is dried to a part of the cold pig iron produced and making molten steel solidification produced；And the fusing in reduced iron
Period supplies dried cold pig iron together with reduced iron.
Hereinafter, referring to figs. 1 to Fig. 2, by according to the equipment for being used to produce molten steel of the embodiment of the disclosure and
Method is explained in more detail.
Reduction on Fluidized Bed furnace 10 is for restoring to produce reduced iron iron ore.In this regard, as the iron ore of raw material
Stone can be powdered iron ore or fine iron ore, and can add secondary raw material in case of need.The fluidisation also
In former furnace 10, as described above, the fine iron ore supplied is reduced while flowing with gas.For this purpose, can be gone back in fluidisation
Gas distribution plate is installed in former furnace 10.
Reduction on Fluidized Bed furnace 10 includes multiple Reduction on Fluidized Bed furnaces, and iron ore pass sequentially through multiple Reduction on Fluidized Bed furnaces 11,12,
It 13 and 14 and is reduced.In this embodiment, including first class reduction furnace is hereinafter referred to as to the 4th Reduction on Fluidized Bed
Four Reduction on Fluidized Bed furnaces of furnace 11,12,13 and 14.
First class reduction furnace 11 is the position for supplying iron ore first.First class reduction furnace 11 is fluidized using from second
The reducing gas that reduction furnace 12 is discharged preheats iron ore.Preheated iron ore is passing through the second fluidisation reduction furnace 12 and third stream
It is reduced or prereduction while changing reduction furnace 13.Second fluidisation reduction furnace 12 is gone back using what is be discharged from third Reduction on Fluidized Bed furnace 13
Raw-gas restores iron ore, and third Reduction on Fluidized Bed furnace 13 utilizes the reducing gas pair being discharged from the 4th Reduction on Fluidized Bed furnace 14
Iron ore is restored.In addition, the 4th Reduction on Fluidized Bed furnace 14 is using the reducing gas being discharged from melting-gasification furnace 20 to iron ore
Finally restored.
Gas pipeline for reducing gas flowing and the feed conduit for moving iron ore and various secondary raw materials are (not
Show) it is connected to each Reduction on Fluidized Bed furnace in multiple Reduction on Fluidized Bed furnaces 11,12,13 and 14.Gas pipeline includes: first gas
Pipeline 21 is used to supply from melting-gasification furnace reducing gas to the 4th Reduction on Fluidized Bed furnace 14；Second gas pipeline
22, it is used to supply from the reducing gas of the 4th Reduction on Fluidized Bed furnace 14 to third Reduction on Fluidized Bed furnace 13；Third gas pipeline
23, it is used to supply from the reducing gas of third Reduction on Fluidized Bed furnace 13 to the second fluidisation reduction furnace 12；And the 4th gas
Pipeline 24 is used to supply from the reducing gas of second reduction furnace 12 to first class reduction furnace 11.
Furthermore, it is possible to install combustion on the extension path of each of second gas pipeline 22 and third gas pipeline 23
Each of burner 15 and 16.Oxygen is blown into the second fluidisation reduction furnace 12 with each of burner 15 and 16 and third fluidizes
In each of reduction furnace 13, and the second fluidisation reduction furnace 12 is increased by exothermic reaction caused by the burning as reducing gas
With the temperature of each of third Reduction on Fluidized Bed furnace 13.
The exhaust being discharged from first class reduction furnace 11 is moved along exhaust pipe 11a, and is being passed through during movement
Remove carbon dioxide from exhaust.The exhaust for eliminating carbon dioxide is supplied to cyclone
It 80 and is supplied again to first gas pipeline 21 or melting-gasification furnace 20.
The not limited to of Reduction on Fluidized Bed furnace 10 can according to need carry out various changes in examples detailed above.
Forming unit 30 includes: reduced iron reservoir 31, be used to be stored in produced in the 4th Reduction on Fluidized Bed furnace 14 it is thin
Reduced iron；And forming device 32, it is used to that thin reduced iron to be made to shape and be compacted.In this regard, forming device is that have each other
The forming device of the pairs of roller faced, i.e. double roller type forming device.Therefore, pairs of at this when the reduction iron supply of pulverulence
Roller between when, the reduced iron of compacting is produced by extruding caused by the rotation by the pairs of roller.
In an example, when reduced iron is supplied in forming unit 30 from Reduction on Fluidized Bed furnace 10, Reduction on Fluidized Bed is come from
The high-temperature reducing gas of furnace moves together in forming unit 30.In this regard, the gas from Reduction on Fluidized Bed furnace 10 is molten
Melt-gasification furnace 20 in the reducing gas that generates, this is described below.In other words, going back from melting-gasification furnace 20
Raw-gas is by Reduction on Fluidized Bed furnace 10, and a part of the reducing gas and reduced iron are moved together to forming unit 30.This
Afterwards, being supplied to drier 500 with the gas that reduced iron moves together and being reused for cold from Reduction on Fluidized Bed furnace 10
The pig iron is dried.
As described above, melting-gasification furnace 20 is for melting reduced iron.In order to melt reduced iron, melting-gasification furnace 20
It is fed with coal briquette and coke, and oxygen is blown into melting-gasification furnace 20.In this regard, in the coal briquette and coke of supply
Each be used as and react with the oxygen being blown into generate hot heat source, to make reduced iron melt and produce molten steel.Melting-gasification
The domed shape that furnace 20 has upper part space wider than other spaces.Reduced iron, coal briquette and coke are fed into circular top part
Divide, i.e. the upper part of melting-gasification furnace 20.
The reducing gas generated in melting-gasification furnace 20 during the fusing of reduced iron is discharged to external and supplies extremely
Cyclone 80.In addition, cyclone 80 supplies reducing gas to first gas pipeline 21 or melting-gasification furnace 20.Along first
The reducing gas that gas pipeline 21 flows is supplied to the 4th Reduction on Fluidized Bed furnace 14 and is reused as going back to the 4th fluidisation
The gas that iron ore in former furnace 14 is restored.
Detect the component content of the molten steel produced in melting-gasification furnace 20.Then, the steel of target component content will be met
Water send to process for making and carries out a series of refinery practices.Hereafter, molten steel is moved into process for making and is produced as slab or vertical
It send to cold pig iron production equipment and is produced as cold pig iron.
In an example, as in the molten steel produced in melting-gasification furnace 20 except target component content
High silicon steel water containing a large amount of silicon is usually rejected.
However, the molten steel except target component content is in cold pig iron production equipment 40 in the embodiment of the disclosure
Middle solidification is to be produced as cold pig iron, and then the cold pig iron is fed into melting-gasification furnace 20.
Cold pig iron production equipment makes the molten steel solidification produced in melting-gasification furnace 20 to produce cold pig iron or the pig iron.This
Kind cold pig iron production equipment is well known in the present art.In addition, molten steel is successively supplied to along one by cold pig iron production equipment
In direction setting and mobile mold, and cooling each mold is so that molten steel solidification.
In this embodiment, the cold pig iron produced in cold pig iron production equipment 40 can be supplied to melting-gasification furnace
The meltability of reduced iron is improved in 20.In other words, when reduced iron and coal briquette to be supplied in melting-gasification furnace 20,
Cold pig iron can be supplied together, reduced iron is melted at lower temperature compared with prior art.It therefore, can be with
It prevents the generation of unfused reduced iron or minimizes the generation of unfused reduced iron.
For this purpose, the drier 500 for the cold pig iron produced in cold pig iron production equipment to be dried is arranged and uses
In the dried cold pig iron of storage and a certain amount of dried cold pig iron is supplied to the cold pig iron bunker of melting-gasification furnace 20
600。
In an example, cold pig iron is produced by being cooled down by water sprinkling.Therefore, cold pig iron contains largely
Water.When cold pig iron is supplied in melting-gasification furnace 20 as former state, operation may be adversely affected.Therefore, cold pig iron is being supplied
It dries before being given in melting-gasification furnace 20 first in drier 500 to remove water.
Cold pig iron is dried using the gas supplied from forming unit 30 according to the drier 500 of the embodiment.More
Body, gas generates from melting-gasification furnace 20 2 times and is supplied to Reduction on Fluidized Bed furnace 10.Hereafter, in Reduction on Fluidized Bed furnace 10
The a part for the gas that iron ore is restored is moved together with reduced iron to forming unit 30.Then, it is single to be moved to forming
The gas of member 30 is moved to drier to dry cold pig iron.In addition, the gas of supply to drier 500 can be dedusting gas.
For example, drier 500 may include: shell, the inner space for receiving cold pig iron is defined in the shell；With
And gas feed line, the gas feed line by dedusting gas for injecting or being supplied in shell.
Dry cold pig iron is stored in cold pig iron bunker 600 in drier 500, then when reduced iron melts, one
Quantitative cold pig iron is supplied to melting-gasification furnace 20.In this embodiment, the cold pig iron in cold pig iron bunker 600 is supplied
To feed line 30a, and therefore, reduced iron and cold pig iron are supplied together to feeding warehouse 20a.That is, reduced iron
It is mixed with each other in feeding warehouse 20a with cold pig iron to form mixture, and the mixture is supplied to melting-gasification furnace 20.
In another example not being limited, cold pig iron can by individual cold pig iron pipeline rather than pass through raw material supply
Line 30a is supplied to melting-gasification furnace 20.
Generally, the cold pig iron produced in cold pig iron production equipment 40 is usually contained equal to or more than 3.5 weight %'s
Carbon.Therefore, cold pig iron has the performance that fusing is easy under 1150 DEG C or higher temperature.Therefore, cold pig iron is being fed into
Start to melt under 1150 DEG C or higher temperature when in melting-gasification furnace 20.At this point, the carbon in cold pig iron is transferred to reduction
Iron is to reduce the measurement point of reduced iron.Therefore, fusing of the reduced iron in melting-gasification furnace 20 becomes more to hold than in the prior art
Easily.Therefore, the problem of reduced iron in unfused state drops to the downside of melting-gasification furnace 20 can be minimized or prevent
Only.Therefore, because such as abnormal aggravation of molten steel discharge, reducing gas circulation caused by unfused reduced iron is unstable
Property, fuel cost increase the problems such as available prevent.
Due to not as adding slag or individual additive, forming unit 30 to reduced iron in the prior art
Productivity reduction and since the increase of fuel cost caused by the increase of the ratio of slag in melting-gasification furnace 20 can be with
It is prevented.Further, since because slag or individual additive addition caused by the physical property such as the intensity of reduced iron
Deterioration caused by the deterioration of gas permeability in melting-gasification furnace available prevent.
In this embodiment, when cold pig iron and reduced iron to be added in melting-gasification furnace, cold pig iron and reduced iron
It is added so that cold pig iron content and the addition ratio (cold pig iron quality/reduction weight of iron) of reduced iron are 0.062 or lower.Example
Such as, cold pig iron content and the addition ratio (cold pig iron quality/reduction weight of iron) of reduced iron are higher than 0.062, molten steel it is main at
This may due to fixed cost increase and opposite increase.
Table 1, which is shown, melts result by the reduced iron obtained according to the method for comparative example and the embodiment of the disclosure.
[table 1]
In each of comparative example and the present embodiment, the reduced iron produced in forming unit is in simulation Reduction on Fluidized Bed
It is reduced in the experimental provision of furnace, and high temperature X-ray visualization device is used to observe the variation of fusion temperature.
For experiment, the reduced iron of compacting is supplied in furnace, with 4 DEG C/min of heating up to 1000 DEG C, and at 1000 DEG C
It is lower to be kept for 30 minutes.The reduced iron of compacting is in up to 725 DEG C of N2Terminate in atmosphere and from 725 DEG C to reaction with 5l/ points
The flow of clock is supplied with the gas of 5% oxidation percentage, that is, CO2Gas.Hereafter, by cooling reduction iron sample (50mm)
It is put into the coke filled layer in simulation melting-gasification furnace experimental provision, and in the temperature that will restore iron sample with 5 DEG C/minute
Clock increases the melting behavior for observing reduction iron sample with X-ray visualization device while 1500 DEG C.In this regard, this reality
The case where applying for by cold pig iron (20mm to 30mm) is placed on the case where at the upper part of coke filled layer and reduced iron, and
The case where the case where comparative example is without placing cold pig iron.
Referring to table 1, it will be seen that compared with comparative example, the fusing initial temperature of reduced iron is reduced in the present embodiment
About 115 DEG C.In addition, the molten steel produced and melting reduced iron falls to the downside of coke filled layer.When under molten steel
When falling completion, the temperature of the molten steel in the present embodiment is 70 DEG C or higher lower than the temperature of the molten steel of comparative example.This is because cold life
Iron melts under 1150 DEG C of relatively lower temp, and the carbon in the cold pig iron of fusing is easy to be reduced carburization, to reduce
The fusing point of reduced iron simultaneously improves meltability.
Similarly, in the embodiment of the disclosure, cold pig iron is fed into melting-gasification furnace, so that reduced iron can
With fusing easy at temperature more lower than the prior art.In other words, the fusing point of reduced iron is reduced by supplying cold pig iron,
So that reduced iron starts to melt at temperature more lower than the prior art.Therefore, do not generated in melting-gasification furnace reduced iron or
Person minimizes the reduced iron in melting-gasification furnace.Therefore, because for example deviation is discharged in molten steel caused by unfused reduced iron
Aggravation, reducing gas circulation unstability, fuel cost increase the problems such as can be prevented from.
In addition, the molten steel except target component content in the molten steel produced in melting-gasification furnace be produced as it is cold
It the pig iron and is fed into melting-gasification furnace and is recycled during reduced iron production, so that molten steel production cost reduces.
Industrial applicibility
In the molten steel production equipment according to the embodiment of the disclosure, do not generated in melting-gasification furnace unfused
Reduced iron minimizes the unfused reduced iron in melting-gasification furnace, so that such as molten steel is discharged the aggravation of deviation, goes back
The unstability of Primordial Qi body circulation, the problem of increase etc. of fuel cost can be prevented from.In addition, raw in melting-gasification furnace
Cold pig iron is produced as in the molten steel except target component content and is supplied to during reduced iron production in the molten steel of production
It into melting-gasification furnace and is recycled, so that molten steel production cost reduces.
Claims (10)
1. a kind of molten steel production equipment, comprising:
Reduction on Fluidized Bed furnace, the Reduction on Fluidized Bed furnace is for restoring to produce reduced iron fine iron ore；
Melting-gasification furnace, the melting-gasification furnace are used to receive the reduced iron from the Reduction on Fluidized Bed furnace and by oxygen
It is blown into the melting-gasification furnace so that the reduced iron melts, to produce molten steel；And
Cold pig iron bunker, the cold pig iron bunker is for making the molten steel solidification produced in the melting-gasification furnace with life
It produces and cold pig iron and the cold pig iron is stored in the cold pig iron bunker, wherein the cold pig iron bunker is by the cold pig iron
It is supplied in the melting-gasification furnace from the cold pig iron bunker.
2. molten steel production equipment according to claim 1, further includes:
Forming unit, the forming unit is for making the reduced iron produced in the Reduction on Fluidized Bed furnace shape and be compacted；
Feeding warehouse, the feeding warehouse are arranged in above the melting-gasification furnace, wherein the feeding warehouse is by the reduced iron through being compacted
It is stored in the feeding warehouse, and the reduced iron through being compacted is supplied in the melting-gasification furnace；
Feed line, the feed line have the one end for being connected to the forming unit and are connected to the feeding warehouse
The other end；And
Cold pig iron supply line, the cold pig iron supply line have the one end for being connected to the cold pig iron bunker and are connected to the original
Expect the other end of supply line.
3. molten steel production equipment according to claim 1, further includes:
Drier, the drier is used to remove moisture from the cold pig iron produced and making the molten steel solidification, to produce
Dry cold pig iron,
Wherein the cold pig iron of the drying is stored in the cold pig iron bunker by the cold pig iron bunker.
4. molten steel production equipment according to claim 3, further includes:
Gas feed line, the gas feed line have the one end for being connected to the forming unit and are connected to the drier
The other end, wherein the gas feed line to the drier supply the Reduction on Fluidized Bed furnace the reduced iron to it is described at
The gas that shape unit moves together when mobile.
5. a kind of method for producing molten steel, which comprises
Fine iron ore is restored to produce reduced iron；
The reduced iron is set to shape and be compacted；And
Reduced iron through being compacted is supplied in melting-gasification furnace so that the reduced iron in the melting-gasification furnace melts,
To produce molten steel,
The reduced iron fusing is wherein set to include:
Make the molten steel solidification produced in the melting-gasification furnace to produce cold pig iron；And
The cold pig iron is supplied in the melting-gasification furnace.
6. according to the method described in claim 5, wherein the cold pig iron be supplied in the melting-gasification furnace including:
Coal briquette is supplied in the melting-gasification furnace together with the cold pig iron.
7. according to the method described in claim 5, further include: moisture is removed from the cold pig iron of production to produce dry cold life
Iron, wherein the cold pig iron of the drying is supplied in the melting-gasification furnace.
8. according to the method described in claim 5, the cold pig iron and the reduced iron are wherein supplied to the melting-gasification
In furnace, so that the ratio of the quality of the relatively described reduced iron of the quality of the cold pig iron is equal to or less than 0.062.
9. according to the method described in claim 7, wherein by using gas generated when the fine iron ore is reduced
To dry the cold pig iron.
10. according to method described in one in claim 5 to 9, wherein the cold pig iron is supplied to the melting-gasification
Include: in furnace
It will be by the cold life of the molten steel production for meeting target component content in the molten steel that is produced in the melting-gasification furnace
The cold pig iron of the molten steel production except target component content in iron and the molten steel produced in the melting-gasification furnace
Mixing, to produce mixture；And
The mixture is supplied in the melting-gasification furnace.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160164437A KR101795467B1 (en) | 2016-12-05 | 2016-12-05 | Apparatus for manufacturing pig iron and method therefor |
| KR10-2016-0164437 | 2016-12-05 | ||
| PCT/KR2017/012806 WO2018105910A1 (en) | 2016-12-05 | 2017-11-13 | Molten iron manufacturing facility and molten iron manufacturing method |
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| Publication Number | Publication Date |
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| CN110168112A true CN110168112A (en) | 2019-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201780082502.5A Pending CN110168112A (en) | 2016-12-05 | 2017-11-13 | Molten iron manufacturing apparatus and process for producing molten iron |
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| Country | Link |
|---|---|
| KR (1) | KR101795467B1 (en) |
| CN (1) | CN110168112A (en) |
| WO (1) | WO2018105910A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1602363A (en) * | 2002-10-08 | 2005-03-30 | 株式会社神户制钢所 | Method for producing titanium oxide containing slag |
| CN101910423A (en) * | 2007-12-26 | 2010-12-08 | Posco公司 | Apparatus for manufacturing molten iron and method for manufacturing the same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001108379A (en) | 1999-10-12 | 2001-04-20 | Nkk Corp | Method and equipment for melting cold iron source |
| KR100807565B1 (en) * | 2001-05-14 | 2008-02-28 | 주식회사 포스코 | Apparatus for drying basic pig iron in torpedo ladle car |
| JP2003113413A (en) * | 2001-10-10 | 2003-04-18 | Nkk Corp | Recycling method for scrapped automobile or electric appliance |
| DE60321221D1 (en) * | 2002-12-21 | 2008-07-03 | Posco Pohang | DEVICE FOR PRODUCING MELT-LIQUID IRON BY HOT COMPRESSION OF FINE, DIRECT REDUCED IRONS AND CALCINATED ADDITIVES AND METHOD OF USE THEREOF |
| KR101466622B1 (en) * | 2013-05-02 | 2014-12-03 | 한국에너지기술연구원 | Electric arc furnace with simultaneous scrap preheating and waste chemical energy recuperation system and it's operation method |
-
2016
- 2016-12-05 KR KR1020160164437A patent/KR101795467B1/en active IP Right Grant
-
2017
- 2017-11-13 WO PCT/KR2017/012806 patent/WO2018105910A1/en active Application Filing
- 2017-11-13 CN CN201780082502.5A patent/CN110168112A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1602363A (en) * | 2002-10-08 | 2005-03-30 | 株式会社神户制钢所 | Method for producing titanium oxide containing slag |
| CN101910423A (en) * | 2007-12-26 | 2010-12-08 | Posco公司 | Apparatus for manufacturing molten iron and method for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| KR101795467B1 (en) | 2017-11-10 |
| WO2018105910A1 (en) | 2018-06-14 |
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