CN104302789A - Molten iron production apparatus and molten iron producing method using same - Google Patents
Molten iron production apparatus and molten iron producing method using same Download PDFInfo
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- CN104302789A CN104302789A CN201380025114.5A CN201380025114A CN104302789A CN 104302789 A CN104302789 A CN 104302789A CN 201380025114 A CN201380025114 A CN 201380025114A CN 104302789 A CN104302789 A CN 104302789A
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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
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
- C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
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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
- C21B13/14—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
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
- C21B2100/28—Increasing the gas reduction potential of recycled exhaust gases by separation
- C21B2100/282—Increasing the gas reduction potential of recycled exhaust gases by separation of carbon dioxide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
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- Manufacturing & Machinery (AREA)
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- Manufacture Of Iron (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to a molten iron production apparatus and a molten iron producing method using the same, comprising: a raw material pre-treatment unit for selecting and pre-treating an iron ore material suitable for reduction; a preliminary reduction reactor having a first rising tube for transferring the pre-treated iron ore material from the raw material pre-treatment unit, and a second rising tube connected to the first rising tube, so as to preliminarily reduce the transferred iron ore material by a reduction gas; a reduction reactor for reducing the partially reduced iron transferred from the preliminary reduction reactor; a molten reduction reactor for producing molten iron by molting and reducing the partially reduced iron obtained from the reduction reactor using the reduction gas; a pre-treatment unit for a by-product gas from an iron-and-steel making process which generates the reduction gas by mixing and reforming the by-product gas from the iron-and-steel making process or carbon dioxide generated from an iron ore reduction process, and supplies the generated reduction gas to the molten reduction reactor or the preliminary reduction reactor; and an iron ore reduction process unit for supplying the carbon dioxide generated from the iron ore reduction process.
Description
Technical field
The present invention relates to a kind of molten iron iron device and utilize the process for producing molten iron of this device, the by-product gas relating more specifically to produce in a kind of iron-smelting process of reforming also utilizes the gas produced to reduce to powder iron ore, produces the device of molten iron simultaneously and utilize the process for producing molten iron of this device by melting and reducing.
Background technology
The powder iron ore reduction technology in the past using fluid bed reduction reactor carrys out the reduced iron production technology based on methane gas of supply of hydrogen by reforming methane-water vapour at nineteen fifties.No. 2821471st, US granted patent or No. 3022156 disclose a kind of main with under condition more than the hydrogen reduction agent of 90% temperature of reaction below 600 DEG C and 5 normal atmosphere, the technology of reduced iron is produced by the Reduction on Fluidized Bed of iron ore, and No. 3246978th, US granted patent discloses and a kind of to gasify the reductive agent gas produced based on coal (C), under temperature of reaction more than 600 DEG C, by reducing the technology of producing reduced iron to iron ore.
Described two kinds of modes are according to used reductive agent type, and the reaction conditions of the production reduced iron such as physics-chem characteristic change, fluidisation properties, solution bonding (sticking) of iron ore can be different.Described patent uses bubbling fluidized bed, develops the iron ore reduction technology of circulating fluidized bed form on the other hand, reduces (No. 5431711st, US granted patent) with the micro mist shape iron ore discarded to iron work.
Described technology continues to be developed to become reduces to the powder iron ore of less than several millimeters in a fluidized bed reactor and produces the commercial technology of reduced iron, as FINEX technology, also describes a kind of CO utilized in removing by-product gas
2rear residual reductive agent gas, to improve the technology (No. 5846268th, US granted patent) of molten iron production efficiency.But, reduced iron production technique based on methane gas or coal (C) is mainly still confined to use senior iron ore, and the reduction of the various fine iron ores do not used at present (comprising the magnetite that the fine powder form below with hundreds of micron exists) is restricted.
And, need to develop a kind of new technology, to overcome in the iron-smelting process based on coal (C) a large amount of limitation of discharging carbonic acid gas, and solve the environmental problem that the increase along with iron and steel output constantly occurs.
Summary of the invention
Goal of the invention
The object of embodiments of the invention is the process for producing molten iron providing a kind of molten iron manufacturing installation and utilize this device, utilizes the by-product gas that produces in iron-smelting process to filter out hydrogen and carbon monoxide and to reduce to iron ore raw material, to produce molten iron.
Technical scheme
One or more embodiment according to the present invention can provide a kind of molten iron manufacturing installation, comprising: raw material preprocessing device, is suitable for reduction for screening and pre-treatment iron ore raw material to make it; Prereduction reactor, comprises and carries the first upcast of pretreated iron ore raw material and the second upcast being connected to described first upcast from described raw material preprocessing device, the prereduction of described iron ore raw material reduced gas; Reduction reactor, for reducing to the partial reduction iron from described prereduction reactor conveying; Fusion reduction reaction device, utilizes reducing gas to carry out melting and reducing, to produce molten iron to the partial reduction iron obtained from described reduction reactor; Ironmaking by-product gas pretreatment unit, for will the carbon dioxide mix that produce reforming to generate reducing gas in ironmaking by-product gas or iron ore reduction technique, and generated reducing gas be fed to fusion reduction reaction device or described prereduction reactor; And iron ore reduction process unit, for supplying the carbonic acid gas produced in described iron ore reduction technique.
According to the described iron ore reduction process unit of one or more embodiment of the present invention, comprising:
Second prereduction reactor, carries out prereduction by the reducing gas supplied from described reduction reactor to iron ore raw material; Second raw material preprocessing device, is fed to described second prereduction reactor by the iron ore raw material that and pre-treatment screened by the reducing gas of described second prereduction reactor supply become to be suitable for described second prereduction reactor; And carbonic acid gas pipeline, isolate carbonic acid gas from the reducing gas pipeline be connected with described raw material preprocessing device, and carbonic acid gas is supplied to described ironmaking by-product gas pretreatment unit.
According to the described ironmaking by-product gas pretreatment unit of one or more embodiment of the present invention, comprising: ironmaking by-product gas tripping device, isolate hydrogen from ironmaking by-product gas, and by described separated hydrogen supply to described second upcast; Primary heater, by carrying out heat exchange with the recycle gas circulated through described raw material preprocessing device, so as to supplying heat to the described ironmaking by-product gas isolating hydrogen; First reforming reactor, produces hydrogen and carbon with the ironmaking by-product gas having been isolated hydrogen by described primary heater described in additional heat, and by produced hydrogen supply to described first upcast; And second reforming reactor, be connected to described first reforming reactor, described second reforming reactor is flowed into together with the carbonic acid gas produced in the carbon and the gaseous combustion by described primary heater that are produced by described first reforming reactor and the carbonic acid gas that produces and iron ore reduction device, thus production carbon monoxide, and produced carbon monoxide is fed to described fusion reduction reaction device.
The secondary heater to described second reforming reactor supply heat also can be comprised according to one or more embodiment of the present invention.
According to the ironmaking by-product gas pretreatment unit of one or more embodiment of the present invention, comprising: ironmaking by-product gas tripping device, isolate hydrogen and by described separated hydrogen supply to described second upcast; Primary heater, carries out heat exchange with the circulation gas circulated through described raw material preprocessing device, so as to supplying heat to the described ironmaking by-product gas isolating hydrogen; And tri-reforming device, the carbonic acid gas produced by the gaseous combustion of described primary heater flows into described tri-reforming device together with the carbonic acid gas produced in described iron ore reduction process unit, thus produce the reducing gas comprising hydrogen and carbon monoxide, and produced reducing gas is fed to described fusion reduction reaction device.
According to one or more embodiment of the present invention, it is characterized in that, the first upcast operates more than 800 DEG C, and described second upcast operates within the scope of 350 ~ 650 DEG C.
According to one or more embodiment of the present invention, it is characterized in that, First Heat Exchanger is provided with between described ironmaking by-product gas tripping device and described second upcast, by carrying out heat exchange to replenish the supply the heat of the reducing gas of described second upcast with the hydrogen of discharging from described first upcast and the second upcast, the second ore conduit that can connect described first upcast and described second upcast is provided with the second interchanger, described first upcast is fed to after the hydrogen of discharging from described second upcast and the partial reduction iron flowing through described second ore conduit are carried out heat exchange, described raw material preprocessing device receives heat from reducing gas pipeline, described reducing gas pipeline supplies reducing gas from reduction reactor.
According to one or more embodiment of the present invention, it is characterized in that, fusion reduction reaction device is provided with the hydrocarbon treatment unit for supplying high heat and reducing gas, and the oxygen pipeline that described fusion reduction reaction device can be arranged for supplying pure oxygen, described hydrocarbon treatment unit is the device making the coal cinder of fine coal, coking coal and briquetting form burn.
According to one or more embodiment of the present invention, also can comprise and be connected to described reducing gas pipeline, for isolating the carbon dioxide separation device of carbonic acid gas from described reducing gas, also can comprise and be connected to described carbon dioxide separation device, for the reducing gas by described carbon dioxide separation device being fed to the reducing gas pipeline of reduction reactor and described separated carbonic acid gas being fed to the carbonic acid gas pipeline of described ironmaking by-product gas pretreatment unit, and can comprise and be arranged on described carbonic acid gas pipeline, for storing the carbon dioxide storage device of described separated carbonic acid gas.
According to one or more embodiment of the present invention, also can comprise: water vapour-gas reforming reactor, be connected to described second raw material preprocessing device, for reforming by described second raw material preprocessing device expellant gas, to produce water vapour; And hydrogen tripping device, be connected to described water vapour-gas reforming reactor, for separating of going out described water vapour and carbonic acid gas.
According to one or more embodiment of the present invention, also can comprise: carbonic acid gas pipeline, be connected to described hydrogen tripping device, for described separated carbonic acid gas being fed to ironmaking by-product gas pretreatment unit; And hydrogen gas lines, be connected to described hydrogen tripping device, for described separated hydrogen is fed to described reduction reactor and the first upcast.
In one or more embodiment according to the present invention, described hydrogen gas lines can be formed the 4th interchanger, described 4th interchanger is by carrying out heat exchange with the gas being fed to described reduction reactor from described fusion reduction reaction device, so as to the hydrogen make thermal source to described hydrogen gas lines, can also comprise and being arranged on described carbonic acid gas pipeline for storing the carbon dioxide storage device of described separated carbonic acid gas, and described hydrogen gas lines and the 3rd well heater can be set from the reducing gas pipeline that described reduction reactor is connected to described raw material preprocessing device, with to the hydrogen make heat through described 4th interchanger.
According to one or more embodiment of the present invention, can provide a kind of process for producing molten iron, comprise: feed pretreatment step, pre-treatment iron ore raw material is suitable for reduction to make it; Pre-reduction procedure, by described pretreated feedstock transportation to the prereduction reactor comprising the first upcast and the second upcast, and carries out prereduction by reducing gas; Reduction step, reduces to the partial reduction iron being transported to reduction reactor after prereduction; Melting and reducing step, utilizes reducing gas to carry out melting and reducing, to produce molten iron to the partial reduction iron obtained from reduction reactor; Ironmaking by-product gas pre-treatment step, reforms the carbon dioxide mix produced in ironmaking by-product gas and iron ore reduction technique, to generate reducing gas, and generated reducing gas is fed to described melting and reducing step or described pre-reduction procedure; And iron ore reduction processing step, supply the carbonic acid gas produced in described iron ore reduction technique.
In one or more embodiment according to the present invention, described ironmaking by-product gas pre-treatment step, can comprise: from described ironmaking by-product gas, isolate hydrogen, and by described separated hydrogen supply to described first upcast; By isolating the ironmaking by-product gas of hydrogen described in carrying out heat exchange to heat with the recycle gas circulated through described raw material preprocessing device and being fed to the first reforming reactor, to produce carbon and hydrogen, and by produced hydrogen supply to described prereduction reactor; The carbonic acid gas produced in the carbon produced and the carbonic acid gas to be produced by described heating and described iron ore reduction technique flows into the second reforming reactor, thus produces carbon monoxide, and produced carbon monoxide is fed to described fusion reduction reaction device.
In one or more embodiment according to the present invention, described ironmaking by-product gas pre-treatment step can comprise: isolate hydrogen from described ironmaking by-product gas, and by described separated hydrogen supply to described prereduction reactor; By isolating the ironmaking by-product gas of hydrogen described in carrying out heat exchange to heat with the recycle gas circulated through described raw material preprocessing device; And the described ironmaking by-product gas isolating hydrogen through heating is fed to tri-reforming device, to produce the reducing gas comprising carbon and hydrogen, and produced reducing gas is fed to described fusion reduction reaction device.
In one or more embodiment according to the present invention, described reducing gas production stage also can comprise unreacted carbon dioxide recovery and again be recycled to tri-reforming device.
In one or more embodiment according to the present invention, described feed pretreatment step is characterized in that, the reducing gas of being discharged by described reduction reactor receives heat, described iron ore raw material is out of shape or adjusting component, to carry out preheating, and described iron ore raw material is any one fine powder form in rhombohedral iron ore, magnetite, the iron ore of moisture content or iron-smelting process dust.
According to one or more embodiment of the present invention, it is characterized in that, described first upcast operates more than 800 DEG C, and described second upcast operates within the scope of 350 ~ 650 DEG C, described second upcast is fed to by carrying out heat exchange with the hydrogen of discharging from described first upcast and the second upcast from the isolated hydrogen of described ironmaking by-product gas, and be arranged on the second ore conduit of described first upcast of connection and the second upcast, and make the hydrogen of discharging from described second upcast and the partial reduction iron flowing through described second ore conduit carry out heat exchange and after heating up, be fed to described first upcast.
In one or more embodiment according to the present invention, the described melting and reducing step hydrocarbon treatment unit also comprised by being connected to described fusion reduction reaction device receives high heat and reducing gas, and receives pure oxygen by oxygen pipeline.
In one or more embodiment according to the present invention, described iron ore reduction processing step can comprise: carry out prereduction by the reducing gas being fed to the second prereduction reactor from described reduction reactor to iron ore raw material; The iron ore raw material that reducing gas pre-treatment by being fed to the second raw material preprocessing device from described second prereduction reactor becomes to be suitable for described second prereduction reactor is fed to described second prereduction reactor; And isolate carbonic acid gas from the reducing gas that described second prereduction reactor is discharged, and be fed to described ironmaking by-product gas pre-treatment step.
According to one or more embodiment of the present invention, it is characterized in that, the separation of described carbonic acid gas is that carbon dioxide separation device by being connected with the second raw material preprocessing device or hydrogen tripping device carry out, in the front end of described hydrogen tripping device, water vapour-gas reforming reactor is set, to produce water vapour from the reducing gas flowed into by described second raw material preprocessing device, and heated from the isolated hydrogen of described hydrogen tripping device by carrying out heat exchange with the reducing gas being fed to reduction reactor from described fusion reduction reaction device, and be fed to described first upcast.
Beneficial effect
Embodiments of the invention are reformed to the carbonated ironmaking by-product gas of bag and produce rich hydrogen reduction agent gas, and selectively the hydrogen in reductive agent gas and carbon monoxide are used for iron ore reduction, the fine iron ore of rhombohedral iron ore and magnetite-series is reduced, thus can molten iron be manufactured.
And, reclaim carbonic acid gas and utilize iron-smelting process gas to reform to carbonic acid gas, recycle, thus there is minimizing carbonic acid gas, guaranteeing that a large amount of hydrogen reduction agent is conducive to the effect of reduction of low grade iron ore simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the molten iron manufacturing installation of the embodiment of the present invention.
Fig. 2 is the schematic diagram of the molten iron manufacturing installation of first embodiment of the invention.
Fig. 3 is the schematic diagram of the molten iron manufacturing installation of second embodiment of the invention.
Embodiment
With reference to accompanying drawing and following embodiment, just can be expressly understood advantage of the present invention, feature and realize these method.But the present invention can implement in a variety of ways, be not limited to following public embodiment.There is provided the object of the present embodiment to be, fully openly the present invention has overall to summary of the invention to make those skilled in the art and understands fully, and protection scope of the present invention should be as the criterion with claims.In specification sheets in the whole text, identical Reference numeral be have employed to identical components.
Fig. 1 is the schematic diagram of the molten iron manufacturing installation of the embodiment of the present invention.Refer to Fig. 1, according to the molten iron manufacturing installation of the embodiment of the present invention, comprise the raw material preprocessing devices such as iron ore 10, ironmaking by-product gas pretreatment unit 20, prereduction/reduction reactor 30 and fusion reduction reaction device 40, effectively to utilize ironmaking by-product gas to manufacture molten iron.The molten iron manufacturing installation of the embodiment of the present invention can change according to used raw material form or can arrange additional unit.
Described raw material preprocessing device 10 is obtained generally with the low grade ore that the fine powder form of less than several millimeters exists by iron ore raw material pipeline 5 supply, and makes it become to be applicable to reduce or adjusting component carries out preheating.
Described raw material preprocessing device 10 according to the reduction of iron ore and the form of melting reactor different, when prereduction/reduction reactor 30 is fixed bed form, it is more favourable that the iron ores particle existed with fine powder form becomes pellet (pellet) form.Especially, be not only the fine iron ore of below the hundreds of micron comprising magnetite being not suitable for blast furnace form reactor, and with the fine iron ore of less than tens microns that dust (dust) form is discharged in iron-smelting process, also pellet form can be become in iron ore raw material preprocessing process.These fine iron ores also can mix with coal or exist with mixed carbon form together with tackiness agent.
When described prereduction/reduction reactor 30 is fluidized-bed form, the iron ore of the fine powder form of several thousand microns to several microns, can suitably be screened and pre-treatment according to its form and physicochemical property, to be suitable for bubbling fluidized bed, circular form fluidized-bed or upcast (riser), rotary fluidized bed, the multiple fluidized-bed reactor such as cylinder (drum) or Sprayable.
The rhombohedral iron ore and magnetite, the rudimentary iron ore containing large quantity of moisture, the iron ore etc. as dust (dust) form of iron-smelting process by product discharge that can not be directly used in blast furnace form is comprised according to the iron ore of the fine powder form of the embodiment of the present invention.The iron ore of the fine powder form of screening according to the form of described prereduction/reduction reactor 30 can be heated to suitable temperature or produce model deformation by physico-chemical process.Especially, the iron ore comprising large quantity of moisture as limonite (limonite) can dried or preheating, and as many in taconite (Taconite) impurity or that iron level is low iron ore can be processed through the raw material pretreatment process such as precrushing or ore dressing.
And, after described ironmaking by-product gas pretreatment unit 20 is recovered in the carbonic acid gas in iron ore reduction technique expellant gas by carbonic acid gas pipeline 37, ironmaking by-product gas such as coke-oven gas obtains at once supplying carbonic acid gas together by ironmaking by-product gas pipeline 6, to carry out mixing reforming, and screening and after being separated, suitably to be distributed described reducing gas by reducing gas pipeline 70 and is fed to fusion reduction reaction device 40.
Its principal constituent of reducing gas after described reformation is hydrogen and carbon monoxide, according to the iron ore kind that will reduce, suitably distribute the described hydrogen of supply and carbon monoxide selectively, just effectively can strengthen the reducing power of prereduction/reduction reactor 30 and fusion reduction reaction device 40.For this reason, ironmaking by-product gas pretreatment unit 20 not only utilizes recovery of heat and the heat supply system of reactor, and utilizes carbon dioxide recovery and reutilization technology suitably to supply the reducing gas being suitable for rudimentary iron ore reduction.
As mentioned above, in an embodiment according to the present invention, by reclaiming and recycling the carbonic acid gas produced in iron-smelting process, carbonic acid gas can be reduced.
See Fig. 1, in an embodiment according to the present invention, prereduction/reduction reactor 30 is loaded by ore conduit 52 through the pretreated iron ore raw material of raw material preprocessing device 10, described iron ore raw material by prereduction and reduction, and is encased in fusion reduction reaction device 40 by part reduced iron line of pipes 54 in described prereduction/reduction reactor 30.
Now, described prereduction/reduction reactor 30 is utilized the reducing gas that risen by reducing gas pipeline 64 from described fusion reduction reaction device 40 and by the reformation reducing gas originating from ironmaking by-product gas pretreatment unit 20 that reducing gas pipeline 60 is supplied, carries out prereduction or reduction to the iron ore carried from raw material preprocessing device 10.
Can connect or the described prereduction/reduction reactor 30 of more than 1 in parallel, with according to iron ores particle size and the reactor types control reduction reaction speed from iron ore deoxidation.Described prereduction/reduction reactor 30 its suitable reduction reaction temperature, pressure range etc. depend on iron ore form and reactor, when the reducing process of described iron ore is fixed bed (fixed bed) form, can carry out reducing and roasting under the high temperature more than 900 DEG C.Described prereduction/reduction reactor 30 can also be interconnected the reactor of various ways.Especially, for fluidized-bed (fluidized bed) reactor, during connection, temperature of reaction and fluidisation degree etc. should be adjusted, to avoid carbon distribution (carbon deposition) or bonding (sticking).
Usually, rhombohedral iron ore (hematite) is greater than normal pressure at pressure and reduces smoothly at the temperature of 600 ~ 850 DEG C, and magnetite (magnetite) reduces smoothly at the temperature of 350 ~ 650 DEG C.And, in order to make the rudimentary iron ores such as the ore of difficult reduction effectively carry out reduction reaction, sending into according to the form of iron ore and reduction reactor and regulating from smelting iron the reducing gas that by-product gas pretreatment unit 20 separates.If use a large amount of hydrogen reduction agent, the reduction rate of rudimentary iron ore can be increased.
And, utilize the hydrocarbon treatment unit 80 of supply high calorie and reducing gas to carry out melting and reducing to the partial reduction iron obtained from described prereduction/reduction reactor 30 according to the fusion reduction reaction device 40 of the embodiment of the present invention, thus manufacture molten iron 90.Described hydrocarbon treatment unit 80 makes the coal cinder of fine coal, coking coal or briquetting form burn, to provide required heat and reducing gas.
Now, from the viewpoint of reducing carbonic acid gas, more preferably utilize pure oxygen as the Media Ratio air adjusting thermal value, described pure oxygen supplied by oxygen pipeline 85.When sending into pure oxygen, in order to the reducing gas infiltration in reactor with guarantee space, not enough motivating force (driving force) is by sending into hydrocarbonly adjusting of being obtained from ironmaking by-product gas pretreatment unit 20 by hydrocarbon (reducing gas) gas tube 70.And, reducing and smelting speed can also be increased by sending into a large amount of hydrogen, thus reduce the reducing gas scale of construction required in reactor and thermal value.
Below, more specifically describe according to the first embodiment of the present invention with reference to Fig. 2.
Fig. 2 is the schematic diagram of the molten iron manufacturing installation of first embodiment of the invention, and basic comprising is identical with Fig. 1 with function.But according to the iron ore kind that will reduce and characteristic, the formation of invention can change or can arrange additional unit.
According to the first embodiment of the present invention, in order to promote, with the indirect reduction of the rudimentary iron ore of fine powder form existence, to employ the reactor of fluidized-bed form as prereduction/reduction reactor.Described fluidized-bed reactor reduces with the iron ore of fine powder form existence by the reducing gas such as carbon monoxide, hydrogen, compared with using the fixed-bed reactor of blast furnace and shaft furnace (shaft), without the need to carrying out the pretreatment technology of the pellet technique or sintering process etc. of iron ore, therefore can Simplified flowsheet, and because iron ore is with the existence of fine powder form, therefore iron ore reduction speed is fast.
Now, the iron ore of fine powder form, according to iron ore variable density when granular size and reduction, is suitable for multi-form fluidized-bed reactor.That is, the combination of all iron ores particles of less than several millimeters preferred multiple fluidized-bed reactor form in reducing process, but not a kind of reactor types.The carbon distribution or bonding phenomenon that produce when the iron ore of fine powder form is reduced can be reduced like this, and reduce the loss of dispersing produced because of fluidized-bed reactor form to greatest extent, thus effective iron ore reduction technique can be realized.This suitably selects fluidized-bed reactor namely can realize according to iron ore form.
In a first embodiment in accordance with the invention, for reduce usually with below hundreds of micron, the fine iron ore that exists of the average grain magnetite form that is distributed as tens microns, be suitable for the fluidized-bed reactor of upcast (riser) form, and in order to reduce usually with less than several millimeters, the fine iron ore that exists of the average grain rhombohedral iron ore form that is distributed as hundreds of micron, applicable bubbling fluidization bed bioreactor.Under suitable reaction conditions, described fine iron ore contacts with reducing gas and after generating reduced iron, can be made into molten iron 90 in fusion reduction reaction device 40.
Shown in (1), the iron ore raw material of described magnetite-series is successfully reduced by the reducing gas containing a large amount of hydrogen, and iron ore indirect reduction reaction is successfully carried out at the temperature of 350 ~ 650 DEG C.
1/4?Fe
3O
4+H
2→3/4?Fe+H
2O----------------------------(1)
Therefore, the iron ore of magnetite-series is mixed into the regular distribution with tens micron particle sizes in raw material preprocessing device 10b, and is processed into and belongs within the scope of Geldart A, therefore carries out being reduced to good at upcast 33,34.Now, by washy iron ore drying technique or ores many for impurity can also be carried out pre-treatment through ore-dressing technique.Usually, when the thin magnetite hydrogen of tens microns is reduced, there is reduction reaction as reductive agent sooner than carbon monoxide at the temperature of reduction reaction initial stage more than 800 DEG C, therefore iron ore is more suitable for by bubbling fluidized bed reduction by upcast (riser) reduction ratio.Now, in described pretreatment technology, preheating can be carried out to fine iron ore, (in advance) reduction can be carried out under the temperature more than 800 DEG C.The portion gas that reduction reactor 32 is discharged, by realizing with under type, is circulated to thin magnetite raw materials pretreatment dress 10b and more than making its heating by ignition to 800 DEG C by described preheating.
Usually, use the reduction reaction of the magnetite-series of hydrogen, till iron ore reduction rate reaches below 40 ~ 50%, fast restore under the reduction temperature more than 800 DEG C, but when reduction ratio is more than 40 ~ 50%, reduction reaction speed can significantly reduce.Therefore, in order to obtain the iron ore reduction rate of more than 50%, temperature of reaction be 350 ~ 650 DEG C comparatively suitable.This is because reduced to thin magnetite by hydrogen, because carbon distribution or bonding can reduce reduction reaction speed while reduction ratio improves.For this reason, connect more than 2 for reduce the upcast of thin magnetite carry out reducing comparatively suitable.
That is, under the first upcast 34 being adjusted to the temperature more than 800 DEG C, reduction ratio reaches 40 ~ 50%, and makes the second upcast 33 acceleration reduction reaction at 350 ~ 650 DEG C of temperature.
The reduced iron of acquisition like this can mix with the reduced iron of rhombohedral iron ore series and be reduced rear loading fusion reduction reaction device 40.Now, the reduced iron of magnetite-series and rhombohedral iron ore series can also be separated loading fusion reduction reaction device 40.For for reducing the reducing gas of described magnetite-series iron ore, the hydrogen originating from ironmaking by-product gas pretreatment unit 20-1 is utilized to be conducive to reduction.But reducing gas can be the form of various mixed gases.In addition, the reactor now used is not limited to upcast, and the kind of iron ore is not limited to the iron ore of magnetite-series, can comprise the iron ore etc. of rhombohedral iron ore series and the non-dusting form as the discharge of iron-smelting process by product, described reduction reactor also can be connected more than 2 according to reduction ratio with the iron ore residence time.
With reference to Fig. 2, iron ore raw material is fed to raw material preprocessing device 10b by iron ore raw material pipeline 5b, raw material preprocessing device 10b screens iron ore raw material and pre-treatment makes it be applicable to reduction, be transported to prereduction reactor at the pretreated iron ore raw material of described raw material preprocessing device 10b, described prereduction reactor forms with the second upcast 33 being connected to described first upcast 34 by carrying the first upcast 34 of described pretreated iron ore raw material.
Iron ore raw material sequentially moves to the first upcast 34, second upcast 33 and reduction reactor 32 from described raw material preprocessing device 10b by the first ore conduit 52a, the second ore conduit 52b and the 3rd ore conduit 52c and is reduced.
Namely, the described iron ore raw material be transferred at prereduction reactor 33,34 by reducing gas by prereduction, and be reduced from the partial reduction iron that prereduction reactor 33,34 is carried at reduction reactor 32, utilize reducing gas to carry out melting and reducing at fusion reduction reaction device 40 the partial reduction iron obtained from described reduction reactor 32, thus produce molten iron 90.
In addition, ironmaking by-product gas pretreatment unit 20-1 and iron ore reduction process unit 100-1 is shown in Fig. 2, described ironmaking by-product gas pretreatment unit 20-1 for mix and reform ironmaking by-product gas or the carbonic acid gas that produces in iron ore reduction technique to generate reducing gas, and generated reducing gas being fed to described fusion reduction reaction device 40 or described prereduction reactor 33,34, described iron ore reduction process unit 100-1 is for supplying described carbonic acid gas.
Now, described ironmaking by-product gas pretreatment unit 20-1, comprising:
Ironmaking by-product gas tripping device 21, isolates hydrogen from ironmaking by-product gas, and by described separated hydrogen supply to described second upcast 33;
Primary heater 12a, carries out heat exchange with the recycle gas in the recycle gas line 72 circulated through described raw material preprocessing device 10b, so as to supplying heat to the described ironmaking by-product gas isolating hydrogen;
First reforming reactor 20a, by described hydrogen supply to described first upcast 34; And
Second reforming reactor 20b, be connected to described first reforming reactor 20a, described second reforming reactor is flowed into together with the carbonic acid gas produced in the carbon and the gas perfect combustion by described primary heater 12a that are produced by described first reforming reactor 20a and the carbonic acid gas that produces and iron ore reduction device 100-1, thus production carbon monoxide, and produced carbon monoxide is fed to described fusion reduction reaction device 40.Now, realized by carbon pipeline 18 to described second reforming reactor 20b for carbon.
Formed primarily of methane by the ironmaking by-product gas isolating hydrogen described in described primary heater 12a additional heat, and flow into primary heater 12a by methane pipeline 19, in described first reforming reactor 20a, produce hydrogen and carbon by the reaction as shown in the formula (2).
CH
4→C+2H
2----------------------------------------(2)
Now, the gas temperature circulated through described raw material preprocessing device 10b is more than 800 DEG C.
Be completely burned for the part in the gas of described primary heater 12a, thus supply carbonic acid gas to the second reforming reactor 20b, also supply heat by secondary heater 12b simultaneously.Remaining gas can be fed to power station 13a, to produce electric power.The hydrogen produced at described first reforming reactor 20a sends into the first upcast 34, and described hydrogen temperature can be more than 800 DEG C, and not enough heat also can utilize combustion gases to supplement, and the portion gas of discharging from reduction reactor 32 can be used as combustion gases.Now, also the hydrogen of discharging from the second upcast 33 can be added to the first upcast 34 after heat exchange in the second interchanger 11b.
Produce by manufacturing the coke-oven gas (COG) that produces in the process of coke to Steel Plant and reclaiming from the carbonic acid gas the iron ore reduction process unit 100-1 expellant gas of the embodiment of the present invention and reform according to the hydrogen reduction agent gas of the first embodiment of the present invention.This is the technology effectively utilized based on the gas produced in the iron-smelting process of coal.
Shown in (3), described second reforming reactor 20b is to the carbon (C) obtained from the first reforming reactor 20a, the carbonic acid gas supplied by carbonic acid gas pipeline 37 reclaimed from iron ore reduction process unit 100 and reform from supplying carbonic acid gas that the secondary heater 12b of heat obtains to the second reforming reactor 20b and obtain carbon monoxide.
C+CO
2→2CO-----------------------------------(3)
In addition, described first upcast 34 operates more than 800 DEG C, and the reducing gas (hydrogen) being therefore fed to described first upcast 34 should meet the temperature of more than 800 DEG C.Therefore, First Heat Exchanger 11a is provided with between ironmaking by-product gas tripping device 21 and described second upcast 33, by carrying out heat exchange, so as to the heat of the reducing gas of described second upcast 33 that replenishes the supply with the hydrogen of discharging from described first upcast 34 and the second upcast 33.
Described heat exchange realizes respectively by the first upcast vent line 34a and the second upcast vent line 33a.Now, high-temperature hydrogen at described first upcast vent line 34a and the second upcast vent line 33a upper reaches, high-temperature hydrogen carries out heat exchange with the hydrogen in the hydrogen gas lines 17a of supply low temperature hydrogen in described First Heat Exchanger 11a, simultaneously when the quantity not sufficient of supplied hydrogen, can by hydrogen supply to the second upcast 33 after heat exchange.
Second interchanger 11b is arranged on the second ore conduit 52b of described first upcast 33 of connection and described second upcast 34, and is fed to described first upcast 34 after the hydrogen of discharging from described second upcast 33 and the partial reduction iron flowing through described second ore conduit 33 are carried out heat exchange.The hydrogen being fed to the first upcast 34 after described heat exchange is fed to the first upcast 34 with by hydrogen gas lines 17a after the hydrogen that the first reforming reactor 20a is fed to the first upcast 34 mixes.
Described raw material preprocessing device 10b needs heat in order to the pre-treatment of iron ore raw material, and the reducing gas (recycle gas) now by being fed to the reducing gas pipeline 62d of described raw material preprocessing device 10b from described reduction reactor 32 supplies heat.That is, after described high-temperature reducing gas heats described raw material preprocessing device 10b, flowed by recycle gas (reducing gas) pipeline 72.The reducing gas flowing through described recycle gas line 72 is also high temperature, therefore as mentioned above, can make the heat exchange of ironmaking by-product gas and the burning of dehydrogenation in primary heater 12a.
According to the iron ore reduction process unit 100-1 of the first embodiment of the present invention, comprising:
Second prereduction reactor 31, carries out prereduction by the reducing gas supplied from described reduction reactor 32 to iron ore raw material;
Second raw material preprocessing device 10a, is fed to described second prereduction reactor 31 by the iron ore raw material that the reducing gas by supplying from described second prereduction reactor 31 becomes to be suitable for described second prereduction reactor 31 through screening and pre-treatment; And
Carbonic acid gas pipeline 37, isolates carbonic acid gas from the reducing gas pipeline 62c be connected with described second raw material preprocessing device 10a, and carbonic acid gas is fed to described ironmaking by-product gas pretreatment unit 20-1.Iron ore raw material by the 5th ore conduit 52e, the 4th ore conduit 52d is sequentially transported to the second prereduction reactor 31 and reduction reactor 32 reduces.
According to iron ore reduction process unit 100-1 of the present invention, reducing gas sequentially flows through the second prereduction reactor 31 and the second raw material preprocessing device 10a by reducing gas pipeline 62a, 62b, and be stored in power station 13b by reducing gas pipeline 62c partial reduction gas, and isolate carbonic acid gas from remaining reducing gas.
Being separated in carbon dioxide separation device 14 of described carbonic acid gas is carried out, isolated carbonic acid gas is fed to described second reforming reactor 20b by carbonic acid gas pipeline 37, from described carbon dioxide separation device 14 isolated reducing gas by reducing gas pipeline 66 with flow into the gas and vapor permeation of the reducing gas pipeline 64 of reduction reactor 32 from described fusion reduction reaction device 40 and be fed to reduction reactor 32.
Now, described carbonic acid gas pipeline 37 can arrange carbon dioxide storage device 15.
According to the first embodiment of the present invention, in the iron ore reduction technique of supply carbonic acid gas, the fine iron ore being used as the reducing gas of reducing gas in a large number containing carbon monoxide average grain to be distributed as to the rhombohedral iron ore series of hundreds of micron size reduces and generates reduced iron, more easily reduces at the temperature of 600 ~ 850 DEG C.
Reaction formula is now as shown in the formula (4).
1/3?Fe
2O
3+CO→2/3?Fe+CO
2-------------------------(4)
According in embodiments of the invention, rhombohedral iron ore series iron ore is mixed into the regular distribution with hundreds of micron particle size in the second raw material preprocessing device 10a, and using bubbling fluidization bed bioreactor to reduce, bubbling fluidization bed bioreactor makes Geldart B grain fluidized.Now, by washy iron ore drying technique or ores many for impurity can also be carried out pre-treatment through ore-dressing technique.
After pretreatment technology, iron ore by using the reducing gas containing a large amount of carbon monoxide risen from fusion reduction reaction device 40, and after reduction reactor 31 mixes with the reduction of iron ore of magnetite-series, can also be reduced at reduction reactor 32.Now, reduction temperature, the scope of 650 DEG C ~ 800 DEG C, promotes reduction to make a large amount of carbon monoxide.The form of reducing gas is preferably a large amount of carbon monoxide risen from fusion reduction reaction device usually, but can exist with the form of various mixed gases.In addition, the reactor now used is not limited to bubbling fluidization bed bioreactor, and the kind of iron ore is not limited to the iron ore of rhombohedral iron ore series, can comprise the iron ore etc. of magnetite and the non-dusting form as the discharge of iron-smelting process by product.
The carbonic acid gas reclaimed from described iron ore reduction process unit 100-1 is the by-product gas of discharging from the second raw material preprocessing device 10a or the second prereduction reactor 31, its part is fed to power station 13b, to produce electric power, and to be remainingly recovered as recycle gas in technological process and after carbon dioxide separation device 14 is separated into carbonic acid gas, a part sends into the second reforming reactor 20b, is remainingly stored in underground by carbon dioxide storage device 15.Mix with the reducing gas risen from fusion reduction reaction device 40 at the reducing gas that described carbon dioxide separation device 14 is separated and send into reduction reactor 32 again.The form of described reforming reactor can be fixed bed or fluidized-bed form, but is preferably fluidized-bed form.The carbon monoxide obtained from the second reforming reactor 20b can send into fusion reduction reaction device 40.
Described fusion reduction reaction device 40 utilizes hydrocarbon treatment unit 80a, 80b of supply high calorie and reducing gas to carry out melting and reducing to the partial reduction iron obtained from reduction reactor 32, thus produces molten iron 90.
Described hydrocarbon treatment unit 80a, 80b make the coal cinder of fine coal, coking coal or briquetting form burn, to provide heat needed for reactor and reducing gas.Now, from the viewpoint of reducing carbonic acid gas, Media Ratio air as adjustment thermal value more preferably utilizes pure oxygen, when sending into pure oxygen by oxygen pipeline 85, permeate in order to the reducing gas in reactor and guarantee space, not enough motivating force (driving force) is supplied by reducing gas pipeline 68 carbon monoxide obtained from the second reforming reactor 20b and is adjusted.Time not enough, also supply by other hydrocarbon supply line 80b.
Below, illustrate according to a second embodiment of the present invention with reference to Fig. 3.
Fig. 3 is the schematic diagram of the molten iron manufacturing installation of second embodiment of the invention.For the Structure and function of the molten iron manufacturing installation of the second embodiment, if no special instructions, identical with the first embodiment, but can change in the carbon dioxide recovery of ironmaking by-product gas tripping device 20-2 and by-product gas reforming method or can additional unit be set.
In second embodiment, the flow direction of fine iron ore in fluid bed reduction reactor is identical with the first embodiment, the fine iron ore of rhombohedral iron ore series at the fine iron ore of bubbling fluidization bed bioreactor, magnetite-series, is reduced while mixing and sends into fusion reduction reaction device 40 after upcast is reduced respectively in reduction reactor 32.But the flow direction of the reducing gas of fine iron ore reduction reactor 32 is reformed according to by-product gas and reducing gas Recycle design can change.
According to a second embodiment of the present invention, using ironmaking by-product gas COG by smelting iron hydrogen that the isolated hydrogen of by-product gas pretreatment unit 20-2 discharged by hydrogen gas lines 17a and first and second upcast 33,34 after First Heat Exchanger 11a carries out heat exchange, sending into the second upcast 33.
And, the gas removing hydrogen from the ironmaking such as COG or FOG (FINEX OFF GAS) by-product gas forms primarily of methane gas, and described methane gas utilizes the recycle gas of more than 800 DEG C that circulates through raw material preprocessing device 10b and by sending into tri-reforming device 20c after the 3rd interchanger 11c additional heat.Now, after the recycle gas of described raw material preprocessing device 10b circulation passes through the 3rd interchanger 11c, a part is fed to power station 13a, and to produce electric power, all the other can also supply carbonic acid gas by perfect combustion while tri-reforming device 20c supplies heat.
Another carbonic acid gas source being fed to described tri-reforming device 20c can be the portion gas recirculation making to discharge from the second raw material preprocessing device 10a or the second prereduction reactor 31, and by using water vapour-gas reforming reactor 25 to be separated expellant gas after hydrogen with hydrogen tripping device 27.Now, the gas of separated hydrogen and reducing gas pipeline 64 is after the 4th interchanger 11d heat exchange, be fed to the first upcast 34 by hydrogen gas lines 17c as reducing gas, described reducing gas pipeline 64 is connected to fusion reduction reaction device 40 and reduction reactor 32 and supplies reducing gas to described reduction reactor 32.
Now, by the hydrogen of described 4th interchanger 11d by being heated with the reducing gas heat exchange being fed to raw material preprocessing device 10b from reduction reactor 32 and being fed to the first upcast 34.
The portion gas of discharging from described hydrogen tripping device 27 is stored in underground by carbon dioxide storage device 15, and remaining is delivered to tri-reforming device 20c and produces reducing gas and hydrogen and carbon monoxide, shown in (5).
CH
4+CO
2→2CO+2H
2-----------------------------------(5)
In described tri-reforming device (20c), the carbonic acid gas of non-complete reaction is recovered and recycled to tri-reforming device 20c by carbonic acid gas recirculation line 22.The reducing gas produced by described tri-reforming device sends into fusion reduction reaction device 40 by reducing gas pipeline 68, thus accelerates fusion reduction reaction.And, reducing and smelting speed can also be accelerated by a large amount of hydrogen of sending into, thus reduce amount and the thermal value of reducing gas required in reactor.All the other formations are identical with the first embodiment, but are not limited to above-mentioned change.
Above, be illustrated embodiments of the invention with reference to accompanying drawing, but be understood by those skilled in the art that, when not changing technological thought or essential feature, the present invention can otherwise implement.
Therefore, the above embodiments are interpreted as just exemplary in all respects and nonrestrictive.Scope of the present invention should be as the criterion with claims but not above-mentioned explanation, and all changes of being derived by the implication of claims, scope and such equivalents or the form of change, all belong to protection scope of the present invention.
Claims (34)
1. a molten iron manufacturing installation, comprising:
Raw material preprocessing device, is suitable for reduction for screening and pre-treatment iron ore raw material to make it;
Prereduction reactor, comprises and carries the first upcast of pretreated iron ore raw material and the second upcast being connected to described first upcast from described raw material preprocessing device, the prereduction of described iron ore raw material reduced gas;
Reduction reactor, for carrying out prereduction to the partial reduction iron from described prereduction reactor conveying;
Fusion reduction reaction device, utilizes reducing gas to carry out melting and reducing, to produce molten iron to the partial reduction iron obtained from described reduction reactor;
Ironmaking by-product gas pretreatment unit, for will the carbon dioxide mix that produce reforming to generate reducing gas in ironmaking by-product gas or iron ore reduction technique, and generated reducing gas be fed to fusion reduction reaction device or described prereduction reactor; And
Iron ore reduction process unit, for supplying the carbonic acid gas produced in described iron ore reduction technique.
2. molten iron manufacturing installation according to claim 1, wherein,
Described iron ore reduction process unit, comprising:
Second prereduction reactor, carries out prereduction by the reducing gas supplied from described reduction reactor to iron ore raw material;
Second raw material preprocessing device, is fed to described second prereduction reactor by the iron ore raw material that and pre-treatment screened by the reducing gas of described second prereduction reactor supply become to be suitable for described second prereduction reactor; And
Carbonic acid gas pipeline, isolates carbonic acid gas from the reducing gas pipeline be connected with described raw material preprocessing device, and carbonic acid gas is fed to described ironmaking by-product gas pretreatment unit.
3. molten iron manufacturing installation according to claim 2, wherein,
Described ironmaking by-product gas pretreatment unit, comprising:
Ironmaking by-product gas tripping device, isolates hydrogen from ironmaking by-product gas, and by described separated hydrogen supply to described second upcast;
Primary heater, by carrying out heat exchange with the recycle gas circulated through described raw material preprocessing device, so as to supplying heat to the described ironmaking by-product gas isolating hydrogen;
First reforming reactor, produces hydrogen and carbon with the ironmaking by-product gas having been isolated hydrogen by described primary heater described in additional heat, and by produced hydrogen supply to described first upcast; And
Second reforming reactor, be connected to described first reforming reactor, described second reforming reactor is flowed into together with the carbonic acid gas produced in the carbon and the gaseous combustion by described primary heater that are produced by described first reforming reactor and the carbonic acid gas that produces and iron ore reduction device, thus production carbon monoxide, and produced carbon monoxide is fed to described fusion reduction reaction device.
4. molten iron manufacturing installation according to claim 3, also comprises,
Secondary heater, to described second reforming reactor supply heat.
5. molten iron manufacturing installation according to claim 2, wherein,
Described ironmaking by-product gas pretreatment unit, comprising:
Ironmaking by-product gas tripping device, isolates hydrogen and by described separated hydrogen supply to described second upcast;
Primary heater, carries out heat exchange with the circulation gas circulated through described raw material preprocessing device, so as to supplying heat to the described ironmaking by-product gas isolating hydrogen; And
Tri-reforming device, the carbonic acid gas produced by the gaseous combustion of described primary heater flows into tri-reforming device together with the carbonic acid gas produced in described iron ore reduction process unit, thus produce the reducing gas comprising hydrogen and carbon monoxide, and produced reducing gas is fed to described fusion reduction reaction device.
6. molten iron manufacturing installation according to claim 1, wherein,
Described first upcast operates more than 800 DEG C, and described second upcast operates within the scope of 350 ~ 650 DEG C.
7. the molten iron manufacturing installation according to any one in claim 1 to 6, wherein,
First Heat Exchanger is provided with, by carrying out heat exchange to replenish the supply the heat of the reducing gas of described second upcast with the hydrogen of discharging from described first upcast and the second upcast between described ironmaking by-product gas tripping device and described second upcast.
8. the molten iron manufacturing installation according to any one in claim 1 to 6, wherein,
The the second ore conduit connecting described first upcast and described second upcast is provided with the second interchanger, and described second interchanger is fed to described first upcast after the hydrogen of discharging from described second upcast and the partial reduction iron flowing through described second ore conduit are carried out heat exchange.
9. molten iron manufacturing installation according to any one of claim 1 to 6, wherein,
Described raw material preprocessing device receives heat from reducing gas pipeline, and described reducing gas pipeline supplies reducing gas from reduction reactor.
10. molten iron manufacturing installation according to claim 2, wherein,
Described fusion reduction reaction device is provided with the hydrocarbon treatment unit for supplying high heat and reducing gas.
11. molten iron manufacturing installations according to claim 10, wherein,
Described fusion reduction reaction device is provided with the oxygen pipeline for supplying pure oxygen.
12. molten iron manufacturing installations according to claim 10 or 11, wherein,
Described hydrocarbon treatment unit is the device that the coal cinder of fine coal, coking coal and briquetting form is burnt.
13. molten iron manufacturing installations according to claim 2, also comprise,
Carbon dioxide separation device, is connected to described reducing gas pipeline, for isolating carbonic acid gas from described reducing gas.
14. molten iron manufacturing installations according to claim 13, also comprise,
Reducing gas pipeline, is connected to described carbon dioxide separation device, for the reducing gas by described carbon dioxide separation device is fed to reduction reactor;
Carbonic acid gas pipeline, for being fed to described ironmaking by-product gas pretreatment unit by described separated carbonic acid gas.
15. molten iron manufacturing installations according to claim 14, also comprise,
Carbon dioxide storage device, is arranged on described carbonic acid gas pipeline, for storing described separated carbonic acid gas.
16. molten iron manufacturing installations according to claim 2, also comprise,
Water vapour-gas reforming reactor, is connected to described second raw material preprocessing device, for reforming by described second raw material preprocessing device expellant gas, to produce water vapour; And
Hydrogen tripping device, is connected to described water vapour-gas reforming reactor, for separating of going out described water vapour and carbonic acid gas.
17. molten iron manufacturing installations according to claim 16, also comprise,
Carbonic acid gas pipeline, is connected to described hydrogen tripping device, for described separated carbonic acid gas being fed to ironmaking by-product gas pretreatment unit; And
Hydrogen gas lines, is connected to described hydrogen tripping device, for described separated hydrogen is fed to described reduction reactor and the first upcast.
18. molten iron manufacturing installations according to claim 17, wherein,
Described hydrogen pipeline forms the 4th interchanger, and described 4th interchanger is by carrying out heat exchange, so as to the hydrogen make thermal source to described hydrogen gas lines with the gas being fed to described reduction reactor from described fusion reduction reaction device.
19. molten iron manufacturing installations according to claim 18, also comprise,
Carbon dioxide storage device, is arranged on described carbonic acid gas pipeline, for storing described separated carbonic acid gas.
20. molten iron manufacturing installations according to claim 19, wherein,
3rd well heater is set in described hydrogen gas lines with from the reducing gas pipeline that described reduction reactor is connected to described raw material preprocessing device, with to the hydrogen make heat through described 4th interchanger.
21. 1 kinds of process for producing molten iron, comprising:
Feed pretreatment step, pre-treatment iron ore raw material is suitable for reduction to make it;
Pre-reduction procedure, by described pretreated feedstock transportation to the prereduction reactor comprising the first upcast and the second upcast, and carries out prereduction by reducing gas;
Reduction step, reduces to the partial reduction iron being transported to reduction reactor after prereduction;
Melting and reducing step, utilizes reducing gas to carry out melting and reducing, to produce molten iron to the partial reduction iron obtained from reduction reactor;
Ironmaking by-product gas pre-treatment step, reforms the carbon dioxide mix produced in ironmaking by-product gas and iron ore reduction technique, to generate reducing gas, and generated reducing gas is fed to described melting and reducing step or described pre-reduction procedure; And
Iron ore reduction processing step, supplies the carbonic acid gas produced in described iron ore reduction technique.
22. process for producing molten iron according to claim 21, wherein,
Described ironmaking by-product gas pre-treatment step, comprising:
Hydrogen is isolated from described ironmaking by-product gas, and by described separated hydrogen supply to described first upcast;
By isolating the ironmaking by-product gas of hydrogen described in carrying out heat exchange to heat with the recycle gas circulated through described raw material preprocessing device and being fed to the first reforming reactor, to produce carbon and hydrogen, and by produced hydrogen supply to described prereduction reactor;
The carbonic acid gas produced in the carbon produced and the carbonic acid gas to be produced by described heating and described iron ore reduction technique flows into the second reforming reactor, thus produces carbon monoxide, and produced carbon monoxide is fed to described fusion reduction reaction device.
23. process for producing molten iron according to claim 21, wherein,
Described ironmaking by-product gas pre-treatment step, comprising:
Hydrogen is isolated from described ironmaking by-product gas, and by described separated hydrogen supply to described prereduction reactor;
By isolating the ironmaking by-product gas of hydrogen described in carrying out heat exchange to heat with the recycle gas circulated through described raw material preprocessing device; And
The described ironmaking by-product gas isolating hydrogen through heating is fed to tri-reforming device, to produce the reducing gas comprising carbon and hydrogen, and produced reducing gas is fed to described fusion reduction reaction device.
24. process for producing molten iron according to claim 23, wherein,
Described reducing gas production stage also comprises unreacted carbon dioxide recovery and is again recycled to tri-reforming device.
25. process for producing molten iron according to claim 21, wherein,
In described feed pretreatment step, the reducing gas of being discharged by described reduction reactor receives heat, and described iron ore raw material is out of shape or adjusting component, to carry out preheating.
26. process for producing molten iron according to claim 25, wherein,
Described iron ore raw material is any one fine powder form in rhombohedral iron ore, magnetite, the iron ore of moisture content or the dust of iron-smelting process.
27. process for producing molten iron according to claim 21, wherein,
Described first upcast operates more than 800 DEG C, and described second upcast operates within the scope of 350 ~ 650 DEG C.
28. process for producing molten iron according to claim 22 or 23, wherein,
Described second upcast is fed to by carrying out heat exchange with the hydrogen of discharging from described first upcast and the second upcast from the isolated hydrogen of described ironmaking by-product gas.
29. process for producing molten iron according to claim 22 or 23, wherein,
Be arranged on the second ore conduit of described first upcast of connection and the second upcast, and make the hydrogen of discharging from described second upcast carry out heat exchange with the partial reduction iron flowing through described second ore conduit and after heating up, be fed to described first upcast.
30. process for producing molten iron according to claim 22 or 23, wherein,
The described melting and reducing step hydrocarbon treatment unit also comprised by being connected to described fusion reduction reaction device receives high heat and reducing gas, and receives pure oxygen by oxygen pipeline.
31. process for producing molten iron according to claim 21, wherein,
Described iron ore reduction processing step, comprising:
By the reducing gas being fed to the second prereduction reactor from described reduction reactor, prereduction is carried out to iron ore raw material;
The iron ore raw material that reducing gas pre-treatment by being fed to the second raw material preprocessing device from described second prereduction reactor becomes to be suitable for described second prereduction reactor is fed to described second prereduction reactor; And
The reducing gas of discharging from described second prereduction reactor isolates carbonic acid gas, and is fed to described ironmaking by-product gas pre-treatment step.
32. process for producing molten iron according to claim 31, wherein,
The separation of described carbonic acid gas is that carbon dioxide separation device by being connected with the second raw material preprocessing device or hydrogen tripping device carry out.
33. process for producing molten iron according to claim 32, wherein,
Water vapour-gas reforming reactor is set in the front end of described hydrogen tripping device, to produce water vapour from the reducing gas flowed into by described second raw material preprocessing device.
34. process for producing molten iron according to claim 32, wherein,
Heated by carrying out heat exchange with the reducing gas being fed to reduction reactor from described fusion reduction reaction device from the isolated hydrogen of described hydrogen tripping device, and be fed to described first upcast.
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| KR1020120052097A KR101321928B1 (en) | 2012-05-16 | 2012-05-16 | Apparatus for manufacturing molten irons and method for manufacturing molten irons using the same |
| KR10-2012-0052097 | 2012-05-16 | ||
| PCT/KR2013/004304 WO2013172653A1 (en) | 2012-05-16 | 2013-05-15 | Molten iron production apparatus and molten iron producing method using same |
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| KR (1) | KR101321928B1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108018391A (en) * | 2017-12-18 | 2018-05-11 | 东北大学 | A kind of method of multistage reduction Refractory iron ore powder production molten iron |
| CN112974825A (en) * | 2021-02-18 | 2021-06-18 | 安徽马钢粉末冶金有限公司 | Reduction method of iron ore powder |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102176345B1 (en) * | 2018-10-17 | 2020-11-09 | 주식회사 포스코 | Manufacturing appratus of molten iron reducing emission of carbon dioxide and manufacturing method of the same |
| KR102176350B1 (en) * | 2018-11-22 | 2020-11-09 | 주식회사 포스코 | Device for manufacturing molten iron |
| CN115896378B (en) * | 2022-10-24 | 2023-05-23 | 中国科学院过程工程研究所 | Electric energy heating hydrogen direct reduction iron-making method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5554206A (en) * | 1994-03-04 | 1996-09-10 | Voest-Alpine Industrieanlagenbau Gmbh | Method of charging ore |
| KR20050054849A (en) * | 2003-12-05 | 2005-06-10 | 주식회사 포스코 | An apparatus for manufacturing a molten iron directly using fine or lump coals and fine iron ores, the method thereof, the integrated steel mill using the same and the method thereof |
| KR20090069591A (en) * | 2007-12-26 | 2009-07-01 | 주식회사 포스코 | Apparatus for manufacturing molten iron and method for manufacturing the same |
| CN101910420A (en) * | 2007-12-24 | 2010-12-08 | Posco公司 | Reducing furnace and apparatus for manufacturing molten iron comprising the same |
| WO2011081276A1 (en) * | 2009-12-28 | 2011-07-07 | 주식회사 포스코 | Apparatus for manufacturing molten iron |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010065011A (en) * | 1999-12-20 | 2001-07-11 | 이구택 | Apparatus for manufacturing molten pig iron, and its manufacturing method |
-
2012
- 2012-05-16 KR KR1020120052097A patent/KR101321928B1/en active IP Right Grant
-
2013
- 2013-05-15 WO PCT/KR2013/004304 patent/WO2013172653A1/en active Application Filing
- 2013-05-15 CN CN201380025114.5A patent/CN104302789B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5554206A (en) * | 1994-03-04 | 1996-09-10 | Voest-Alpine Industrieanlagenbau Gmbh | Method of charging ore |
| KR20050054849A (en) * | 2003-12-05 | 2005-06-10 | 주식회사 포스코 | An apparatus for manufacturing a molten iron directly using fine or lump coals and fine iron ores, the method thereof, the integrated steel mill using the same and the method thereof |
| CN101910420A (en) * | 2007-12-24 | 2010-12-08 | Posco公司 | Reducing furnace and apparatus for manufacturing molten iron comprising the same |
| KR20090069591A (en) * | 2007-12-26 | 2009-07-01 | 주식회사 포스코 | Apparatus for manufacturing molten iron and method for manufacturing the same |
| WO2011081276A1 (en) * | 2009-12-28 | 2011-07-07 | 주식회사 포스코 | Apparatus for manufacturing molten iron |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108018391A (en) * | 2017-12-18 | 2018-05-11 | 东北大学 | A kind of method of multistage reduction Refractory iron ore powder production molten iron |
| CN112974825A (en) * | 2021-02-18 | 2021-06-18 | 安徽马钢粉末冶金有限公司 | Reduction method of iron ore powder |
| CN112974825B (en) * | 2021-02-18 | 2024-05-24 | 安徽马钢粉末冶金有限公司 | Reduction method of iron ore powder |
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| WO2013172653A1 (en) | 2013-11-21 |
| CN104302789B (en) | 2016-06-22 |
| KR101321928B1 (en) | 2013-10-28 |
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