CN1894426A - Method and apparatus for producing molten iron - Google Patents
Method and apparatus for producing molten iron Download PDFInfo
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- CN1894426A CN1894426A CN 200480028077 CN200480028077A CN1894426A CN 1894426 A CN1894426 A CN 1894426A CN 200480028077 CN200480028077 CN 200480028077 CN 200480028077 A CN200480028077 A CN 200480028077A CN 1894426 A CN1894426 A CN 1894426A
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Abstract
A system for producing molten iron from iron ores, including a direct reduction shaft furnace, a melting zone in a melting furnace having a coke bed in its lower portion and a charging and preheating chamber in its upper portion, and at least one reducing gas generation zone in communication with said melting zone.
Description
By reference and related application/patent incorporated herein
The application requires to enjoy in the U.S. Provisional Patent Application No.60/507 that submitted on September 30th, 2003, and 160, and the right of priority of the novel patent application of submitting on September 29th, 2004 of U.S. utility (sequence number is still unknown).
Each application and patent of being quoted herein, and in each application and patent each file of being quoted or reference (being included in " apply for quoted file " in the prosecution process of each granted patent), and corresponding to and/or require to enjoy PCT and the foreign application or the patent of the right of priority of these applications and patent, and in each document of being quoted of application, quote or each document of reference, they all are combined in herein by reference and clearly.More in a broad sense, file of quoting herein or reference or be in the reference tabulation before the claim, or be among the text itself; And, all these files or reference (" reference that this paper quoted "), and all files of being quoted in the reference that this paper quoted or reference (comprising specification sheets, operation instruction of any manufacturers or the like) all are combined in herein by reference and clearly.
Background of invention
1. invention field
The present invention relates to can be used for making steel and the production field of the iron material of other technological process.Specifically, the present invention relates to the direct reduction of ferric oxide in the moving-bed reduction reactor, the reductive iron material is changed into the smelting furnace of molten iron and reducing gas producer.
2. the introduction of correlation technique
People recognize for a long time, compare with the blast furnace of full blast, and it is desirable that researchdevelopment goes out the technology that can produce molten iron from iron ore with competitive cost.Because the productivity that it is higher, blast furnace remain the preferred method of producing molten iron in Iron And Steel Industry.Yet blast furnace needs expensive coke.This has several shortcomings, and one of them is exactly that coking coal is not to be found everywhere through the world.Therefore, in many cases must be with great cost to the import of Iron and Steel Production state.In addition, coal is transformed into coke needs coking plant.Change into the expense that coke need be correlated with together with coal, under the new pollution regulatory act of a lot of countries, do not think that coking plant is eco-friendly.As a result, many manufacturers do not need basically just to seek the alternative method of the production iron and steel of independent coking plant, and the process for producing steel and iron that seldom needs coke.
For producing molten iron, conceived multiple technologies, make molten iron can be seated in the smelting furnace and be refined into steel.Two such examples comprise oxygen coverter and electric arc furnace.The purpose of these production technique is, with the alternative traditional and more expensive coke of the fuel of lower cost, optimizes traditional blast smelting furnace formula device by to a certain extent.But up to the present, these production technique all can not provide with blast furnace or directly the reduction-type stove compare with the electric furnace combined facility and the factory that can produce molten iron with competitive price.
The example of this scheme comprises the U.S. Patent No. 4,001,008 of Stift and the U.S. Patent No. 3,236,628 of L.VonBogdandy.Stift discloses a kind of being used at the method and apparatus that is integrated in the shaft furnace reducing iron ore on the smelting furnace.Iron ore is introduced in the top of shaft furnace under the condition of not adding coke, and along descending along shaft furnace with the opposite direct of travel of the rising reducing gas that generates in the smelting furnace outside through partial combustion.
The reducing gas of heat and carbon dust are bootable to the iron bath of smelting furnace melting part, yet the production technique of Stift is except the heat that needs partial combustion and produce, also needing provides more heat to hot gas, and the integrated of reduction shaft furnace and smelting furnace do not allow for three related main production promptly: the melting of the ore after ore reduction, the reduction and the generation of reducing gas provide optimal conditions.The production technique of Von Bogdandy is similar with it in some aspects, also needs by providing electric energy to iron bath for providing more heat with the reductive ore smelting.
Authorize people's such as Yamaoka U.S. Patent No. 4,504,043,4,564,389 and described technology and the device that is used to carry out coal gasification and produces the pig iron.These patent disclosures the smelting furnace that separates with reduction shaft furnace, wherein form under the determined condition of the fuel combustion of reducing gas in smelting furnace.Smelting furnace comprises has filled the most of volumetrical coke bed of smelting furnace.Be covered with one deck reductive iron ore on the end face of coke bed, its heat by the hot gas that rises via described coke bed melts.In passing a plurality of burners of furnace wall,, can generate high temperature reduction gas by the partial combustion with oxygen such as fuel such as coal dust, heavy oil, Sweet natural gas.Molten iron and slag are all discharged from the lower section of smelting furnace, and extract hot gas out, make it be used for reducing iron ore in the reduction shaft furnace relevant with smelting furnace, or as other purposes.
There is some shortcoming in the production technique of Yamaoka and is not used for Iron And Steel Industry owing to it.For example, because fuel oxidation is reflected at inside furnace and carries out, so some reagent may react with coke bed, and consumes coke.Owing to the reason of cost and in the use of smelting furnace the coke of supplement consumed need special blow-on or operation, so the consumption of coke causes running cost to increase.
People's such as Contrucci U.S. Patent No. 5,149,363 discloses and a kind ofly has been used to make melting of metal and smelt iron ore and produces the technology and the smelting furnace of molten iron material.This production technique has the shaft furnace that is positioned on the smelting furnace.By different positions supply air or oxygen at shaft furnace, can improve energy utilization ratio to the coal dust in the smelting furnace, liquid state or the gas that hydrocarbon gas and oxygen combustion produced, the oxygenizement of this gas can produce heat, and it is used to promote carbon containing autoreduction particulate iron reductive action.When this production technique is used for molten metallic material such as the bushel iron or the pig iron, as in cupola furnace, owing to coke is not added in the furnace charge, has therefore greatly reduced the consumption of coke, thereby avoided the reducing gas of coke and rising to react.Yet this production technique is not separated gas generating area and equipment with smelting furnace.
Another known fusion gasification burner with the co-axial chamber of smelting furnace in realize the partial combustion of coal, thereby make the gas percussion iron bath that is produced, on the opposite direction of the iron content grain flow that descends with described smelting furnace, rising then.This patent has proposed to be used for the independent chamber of partial combustion, but there is a great shortcoming, this is that this can bring the expense of sizable proprietary material and design aspect because described chamber is positioned at inside furnace, so that make this structure can bear hot environment in the described smelting furnace.
Another production technique of having implemented is for many years separated reduction shaft furnace and smelting furnace, but exists the drawback that forms reaction chamber in the iron bath top, and this reaction chamber is used for coal combustion, and produces heat and the reducing gas that is used for reduction furnace.Though this production technique can successfully be carried out under the condition of not using coke, has but brought the remarkable shortcoming that produces too much reducing gas, these reducing gass must be used for some other purposes, for example are used to the purposes of generating electricity or heating.This technology does not have competitive power when considering separately, so its application is not promoted as originally not expecting and come.
Therefore, the present invention is devoted to overcome these shortcomings and other shortcoming of prior art.
Goal of the invention
Therefore, the purpose of this invention is to provide a kind of improved system that is used for producing steel-making and the used molten iron of other metallurgical technology.
Another object of the present invention provides a kind of improvement system that is used to produce molten iron, and it carries out molten iron production under reaction zone that three physics separate or the optimum operation condition in equipment, for example reducing gas generating area, moving-bed reduction zone and the melting area.
Another purpose of the present invention provides a kind of improved system that is used to produce molten iron, it is suitable for installing in conjunction with existing direct reduction plant, so that replace to and effectively utilize fuel such as Sweet natural gas, and utilize it to produce the high-quality pig iron with lower cost.
An also purpose of the present invention provides a kind of improved system that is used to produce molten iron, and it is adapted to be mounted within the Electric furnace steel making equipment, so that molten metal is loaded in the described electric furnace, and reduces current consumption and improves its productivity.
Other purpose of the present invention is conspicuous for those skilled in the art, perhaps points out in following specification sheets.
Brief summary of the invention
Purpose of the present invention is generally by providing a kind of system that produces molten iron with bulk or granular iron ore to realize that this system comprises three reaction zones that separate or smelting furnace: (1) is reduction-type shaft furnace directly, (2) smelting furnace and (3) reducing gas producer; Described system is characterised in that: (a) by the reaction of described ore and high temperature reduction carburizing gas, predetermined extent ground metallizes and the reduction intermediate product of carbonization and generate in described reduction furnace; (b) described reduction intermediate product is installed on the coke bed in the described smelting furnace, so that make described reduction intermediate product by being melted with contacting of described high temperature reduction gas; (c) partial combustion by hydrocarbon fuel and oxygen-containing gas and steam, and in the reducing gas generating area, generate reducing gas; (d) described reducing gas is sent in the described smelting furnace, comes in contact, thereby reduced any burning of described coke bed to greatest extent to prevent the described coke bed in any free oxygen and the described smelting furnace.
Brief description
In this specification sheets and accompanying drawing, show and introduced preferred embodiments more of the present invention, and proposed its various modification and remodeling.Be appreciated that these are not is exhaustive, many other variations and modifications may be made within the scope of the invention.
Select for purpose of explanation and comprised proposal herein, so that those of skill in the art can more fully understand the present invention and its principle, and therefore can make amendment to it with various forms, make its each form all can be suitable for the condition of specific end use most.
In following detailed introduction with reference to the accompanying drawings, wherein:
Fig. 1 has shown and has been used for producing reducing gas and with the synoptic diagram of described gas distribution to one embodiment of the present of invention of smelting furnace.
Fig. 2 has shown and has been used for producing reducing gas and with the synoptic diagram of described gas distribution to the second embodiment of the present invention of smelting furnace.
Fig. 3 has shown the graphic representation of the oxygen of iron fusing to the best ratio of Sweet natural gas that be used to make according to an embodiment of the invention.
Fig. 4 is used for producing reducing gas and with the synoptic diagram of described gas distribution to further embodiment of this invention of smelting furnace, wherein DRI is a remote production.
The detailed description of the preferred embodiments of the present invention
Now with reference to accompanying drawing the present invention is described.Referring to Fig. 1, shown smelting furnace 10 with crucible section 12 and charging shaft furnace 14.Coke bed 16 has been filled the major part of crucible section 12, thereby for containing metal iron particulate bed 18 provides the porous support, these iron content particles can descend and descend along shaft furnace 14 along with described iron particulate fusing.The high temperature reduction gas 20 that is produced in a plurality of gas generating area 22 is by coke bed 16, the major portion of this gaseous constituent comprises hydrogen and carbon monoxide, yet this gaseous mixture may comprise some carbonic acid gas and water, typical combustion by-product and some methane and other unburned fuel.The actual constituent of reducing gas 20 depends on the type of employed fuel, and will and contain the reduction potential value that the gas 26 of free oxygen reacts and adjusts to expection by fuel 24.The flow rate of fuel and oxygen is regulated by suitable control valve 33 and 35.
Because the existence of nitrogen can be circulated back to restriction the quantity of the reducing gas in the reduction reactor in the reducing gas, so preferably adopt pure oxygen as making meat incendiary oxygenant, reducing material melts but air in the burner 44 and oxygen-rich air also can be used for making.
Reaction material in the burner 30 has produced the thermal-flame 20 between about 2,000 ℃ to about 2,500 ℃.Gas generating area 22 is designed to preferably make flame can directly not impact its refractory-lined ovens lining.Gas generating area 22 also be designed to make gas that reaction volume allows to contain free oxygen in being introduced into smelting furnace and with before coke bed 16 contacts by completely consumed.For this reason, described gas generating area has at least approximately length of 0.6m, preferably surpasses 0.8m.Yet the gas generating area of other length is conspicuous for those of skill in the art, and also belongs to the design in the scope of the present invention.Definite length itself is not as using pure free oxygen to burn and to prevent that free oxygen from contacting with coke so important for production technique of the present invention.
The target of this length of gas generating area 22 is the consumption that farthest reduces coke, and is reduced in the amount of the coke that must change in the smelting furnace therefrom.This target mainly be by guarantee all basically free oxygens reducing gas with all be used to burn realize before coke contacts.By realizing this target, just almost there is not remaining oxygen to come oxidation or combustion of coke.By preventing the coke burning, just reduced the prime cost of the material that may consume in the ironmaking process to greatest extent, thereby reduced the overall cost of production technique.Therefore, fuel by using other considerably cheaper such as coal, oil, refinery coke etc. just can greatly reduce the cost of system iron, and improve efficient.
The material (DRI) 18 that contains reduced iron is melted, and flows downward to the base section of smelting furnace 10 by coke bed 16, and here, it is sucked up in the mould (not shown) with manner known in the art by discharge-channel 32.
Smelting furnace 10 is preferably in about 1 to 10kg/cm
2, be preferably about 4 to 6kg/cm
2Down work of pressure, therefore export 36 waste gas 34 and can be injected in the reducing gas loop of reduction reactor 38, and need not any pumping installation.The temperature of waste gas is about 400 to 800 ℃.
Iron-bearing materials: DRI (sponge iron) 39 and other material such as Wingdale 48, Wingdale and bituminous oil 50, coke 52 and DRI or scrap iron 53 are loaded in the smelting furnace 10 by the system of a kind of storehouse and valve, and this storehouse and valve system comprise atmosphere storehouse 40, pressure storehouse 42 and sealed valve 44 and 46.By industrial known mode, material is loaded in the storehouse 40, and by open valve 44 when valve 46 is closed, valve-off 44 afterwards, to storehouse 42 pressurization and open valve 46 and with material transfer to storehouse 42.Because the heat of gas 20 can make some coke gasifications once in a while, so coke must load to form coke bed 16 required amounts.Baslled iron, scrap iron etc. also can install in the smelting furnace 10 and melt.
It is evident that for those of skill in the art, except moving-burden bed reactor 38, according to the present invention, also can use dissimilar reduction reactors, for example fixed-bed reactor or fluidized-bed reactor.
After the reduction of iron particle, the reducing gas 60 of discharge is extracted out from reactor 38, and through over-heat-exchanger 62, in the heat exchanger part, the water from water source 64 can be become steam 65, and it can be used for burner 24 or CO
2Scavenge system 78.Afterwards, in water cooler 66,, and make reducing gas 60 coolings of discharge for example by described gas is contacted with water.This process can make any residual moisture in the reducing gas of discharge condense.The sub-fraction 68 of the cooling gas that control valve 70 is regulated is removed away from the reduction loop, thereby has eliminated rare gas element, has regulated the pressure of system simultaneously.
Then, compressor 74 is with major part 72 pumpings of cooling gas and be transported to CO
2In the scavenge system 78, to remove carbonic acid gas.This has the reduction potential regenerated effect that makes gas.CO
2Scavenge system 78 can be the contacted absorption type of gas and liquid, perhaps is adsorpting type (absorption that pressure absorption or volume swing are carried out).Afterwards, if desired, the reducing gas 80 of recirculation and Sweet natural gas 82 from suitable source of the gas 84 can be combined, and in well heater 90, be heated to about 750 ℃ to about 950 ℃ temperature range.As required, also can use Sweet natural gas in the burner of well heater 90, the part 88 of the reducing gas that is produced in itself and the smelting furnace 10 is combined.From the hot gas of well heater 90 can various ratios with from more Sweet natural gases 92 of suitable source of the gas 94, from the gas that contains free oxygen 96 of source of the gas 98 and come the waste gas 34 of self-thermo furnace 10 to combine, the gas 96 that contains free oxygen can be molecular oxygen or oxygen-rich air.The injection of free oxygen causes the hydrocarbon generating unit divided combustion of hot gas 58, make its temperature rise to about 1000 ℃ to about 1150 ℃ scope, be entered into then in the reduction reactor 38, to be used to produce DRI or sponge iron 39.
Fig. 2 has shown another embodiment of the present invention, the described similar or parts that are equal to of wherein identical label table diagrammatic sketch 1.Be used for producing the molten iron or the pig iron at the device shown in Fig. 2 by iron ore.This device comprises smelting furnace 10, reduction furnace or shaft furnace 38 and reducing gas producer 21.
Smelting furnace 10 comprises coke bed 16, and reductive iron 18 or DRI or sponge iron are deposited on the coke bed 16 so that fusing.Tie Tong crosses traditional method and is sent in the reduction furnace 38, and is reduced in reduction furnace and forms DRI.Heated air is partly by using reducing gas producer 21 to be provided to reduction chamber 38, so that the heating iron ore.Reducing gas producer 21 comprises one or more burners 31, and its incendivity hydrocarbon fuel includes but not limited to coal, oil, refinery coke or the like.This burner 31 connects with multiple tubing system 24,26, comprises oxygen system, fuel system, steam system etc.Oxygen is used for carrying out the partial combustion of the hydrocarbons that fuel system provided, and steam also can be used for making the spraying of ruel burning, and is used for improving the temperature of mixture before burning.The partial combustion of fuel such as refinery coke has produced the reducing gas of High Temperature High Pressure, and it is injected in the smelting furnace 10 by passage 23.This gas temperature before contact coke bed 16 and has the reduction composition usually about more than 1400 ℃.These gases are distributed in by gas distribution chamber 25 around the periphery of crucible section 12, and gas distribution chamber 25 is formed in the refractorily lined 27 and has nozzle (not shown) around described melting area 12.In one embodiment, the flow rate of valve 33 and 35 difference fuel meterings 24 and oxygen 26 is so that adjust the temperature and the composition of the reducing gas that is produced.Gas generation cavity 21 is provided with and is used for outlet at bottom 100 and the shut off valve 102 that extraction can accumulate in wherein dust, slag and impurity.
Hot gas passes coke bed 16 and rises, with the DRI fusing thereon of mobile accumulation in the opposite direction.The fused molten iron is collected in the bottom of smelting furnace 10, and leaves by web member 32 and to enter in the mould, to be used for further processing as steel-making.
After through the DRI in the smelting furnace 10 of packing into, reducing gas leads in the reduction furnace 38 by pipe connecting 36.In reduction furnace, reducing gas is used for iron ore is changed into the employed DRI of smelting furnace.The operation of reduction furnace 38 is substantially the same with the operation in conjunction with the reduction furnace of introduction embodiment illustrated in fig. 1.
Referring to Fig. 3, the figure illustrates oxygen volume in gas generating area 22 or carbide feed generator 21 to the optimised working region of the ratio of Sweet natural gas volume, it can make the temperature of gas reach the level that can melt DRI, and the heat that is produced is enough to melt the DRI of aequum, and the reducing gas (H of capacity can be provided simultaneously
2+ CO) to be used for that the iron oxide reduction of stove 38 is become DRI.Know that along with the ratio of oxygen to Sweet natural gas improves, temperature and heat all will increase, but the raising of this oxygenizement can reduce the quality of reducing gas, and therefore reduce the amount that can be used for the reductive reductive agent.The applicant has been found that the oxygenant that is used to operate smelting furnace must meet above-mentioned requirements to the preferable range of the ratio of fuel, so that this production technique is attractive economically.Although oxygen is used for Sweet natural gas in this article to the design of the preferable range of the ratio of fuel, it also can be applicable to other fuel.For Sweet natural gas, this preferable range is about 0.86 to about 1.04.
Fig. 4 has shown one embodiment of the present of invention, and the material that wherein contains reduced iron is produced in the position away from the molten iron production workshop, and via DRI storehouse 39 in the smelting furnace of packing into.This embodiment can be used for wherein steelworks and buys the situation of DRI from the DRI trader there.As shown in Figure 4, the thermal reduction gas that is produced in the smelting furnace 10 can be used as fuel, synthesis gas or is being used for generating after excessively in smelting furnace 10, and discharges by pipe connecting 36.This embodiment also can be used for improving the productivity of the electric arc furnace in the electric furnace of packing into of molten iron wherein, thereby has reduced fusing time and current consumption.
In synoptic diagram Fig. 4 of the present invention, shown wherein reducing gas waste gas 34 a kind of application of portion's round-robin within it from described smelting furnace.Label among Fig. 4 represent with Fig. 1 in similar elements.The reducing gas 34 of discharging from smelting furnace 10 cools off in heat exchanger 62 and water cooler 66 and purifies, and is recycled by compressor set 74 then and passes through CO
2Scavenge system 78 is heated to about temperature more than 800 ℃ afterwards, yet is circulated in the described smelting furnace 10, so that use these reducing gass to melt DRI as much as possible.This gas circulation has improved the efficient of smelting furnace.
Above show, above-mentioned purpose and purpose have clearly from the above description been realized effectively, carry out some variation because under the condition that does not break away from the spirit and scope of the present invention, can state in realization aspect method and the structure, it is illustrative that all the elements that comprised in the description therefore and that show in the accompanying drawings all should be considered as, but not has limited significance.
Claims (17)
1. system that is used for producing molten iron by iron ore, it comprises:
(1) direct reduction-type shaft furnace;
(2) melting area in the smelting furnace, charging and preheating cavity that it has the coke bed that is positioned at its underpart and is positioned at its top; With
(3) at least one reducing gas generating area that is communicated with described melting area; Wherein, described system:
(a) by the reaction of described ore and high temperature reduction carburizing gas, predetermined extent ground metallizes and the reduction intermediate product of carbonization and generate in described reduction furnace;
(b) described reduction intermediate product is contained on the described coke bed in the described smelting furnace, thereby makes described reduction intermediate product by being melted with contacting of described high temperature reduction gas;
(c) partial combustion by hydrocarbon fuel and oxygen-containing gas, and in described reducing gas generating area, generate reducing gas; And
(d) described reducing gas is transported in the described smelting furnace, comes in contact to prevent the described coke bed in any free oxygen and the described smelting furnace.
2. the system that produces molten iron by iron ore according to claim 1, it is characterized in that, in the partial combustion chamber, generate described reducing gas, make hydrocarbon fuel and oxygen-containing gas generation combustion reactions, so that before touching described coke bed, eliminate the existence of any free oxygen basically.
3. the system that produces molten iron by iron ore according to claim 2 is characterized in that described hydrocarbon fuel is a Sweet natural gas.
4. the system that produces molten iron by iron ore according to claim 3 is characterized in that, the volumetric flow rate of described oxygen-containing gas to the ratio of the volumetric flow rate of described Sweet natural gas about 0.86 to about 1.04 scope.
5. the system that produces molten iron by iron ore according to claim 2 is characterized in that described hydrocarbon fuel is a liquid.
6. the system that produces molten iron by iron ore according to claim 2 is characterized in that described hydrocarbon fuel is a refinery coke.
7. the system that produces molten iron by iron ore according to claim 2 is characterized in that described hydrocarbon fuel is a coal.
8. the system that produces molten iron by iron ore according to claim 1 is characterized in that, described system:
(e) from described reduction furnace, extract reacted reducing gas out;
(f), and the reduction potential of the reducing gas of described extraction is regenerated by cooling and remove its aqueous at least a portion;
(g) part of the reducing gas that described regenerated is extracted out is heated to the temperature more than 800 ℃; And
(h) reducing gas that the regenerated after the described heating is extracted out is transported in the described reduction furnace.
9. the system that produces molten iron by iron ore according to claim 1, it is characterized in that, in single partial combustion chamber, generate described reducing gas, and by being formed at and a plurality of inlets in the refractorily lined of described smelting furnace and described reducing gas is transported in the described smelting furnace.
10. the system that produces molten iron by iron ore according to claim 1, it is characterized in that, generate described reducing gas in a plurality of partial combustion chambers, described partial combustion chamber is connected on the described smelting furnace by being configured as a plurality of inlets that pass described furnace wall.
11. the system that produces molten iron by iron ore according to claim 1, it is characterized in that described inlet is located in the described smelting furnace, so that carry high temperature reduction gas and make it to contact with described coke bed, pass the part of described coke bed and rise, and the described preheating cavity by described smelting furnace.
12. the system that produces molten iron by iron ore according to claim 10 is characterized in that, described iron-bearing materials is at the DRI away from the production site of described smelting furnace.
13. the system that produces molten iron by iron ore according to claim 11 is characterized in that, the described reducing gas of discharging from described smelting furnace also can be used as the synthetic gas in fuel, power generation application or other chemical enginnering process.
14. the system that produces molten iron by iron ore according to claim 8 is characterized in that, the length of described partial combustion chamber is about at least 0.6m.
15. the system that produces molten iron by iron ore according to claim 8 is characterized in that, the length of described partially combusted chamber is about at least 0.8m.
16. the system that produces molten iron by iron ore according to claim 1 is characterized in that described smelting furnace is positioned at the position away from described direct reduction-type shaft furnace, described system:
(a) from described smelting furnace, extract waste gas out;
(b) cool off and purify described waste gas;
(c) from described waste gas cooled, isolate CO
2
(d) described waste gas cooled is heated to about temperature more than 600 ℃; And
(e) with the reducing gas exhaust gas recirculation of described heating in described smelting furnace.
17. the system that produces molten iron by iron ore according to claim 15 is characterized in that, a described part through overcooling and purified waste gas of discharging from described smelting furnace is used as fuel, to be used to heat the gas of described recirculation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US50716003P | 2003-09-30 | 2003-09-30 | |
| US60/507,160 | 2003-09-30 | ||
| US10/953,735 | 2004-09-29 |
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| Publication Number | Publication Date |
|---|---|
| CN1894426A true CN1894426A (en) | 2007-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200480028077 Pending CN1894426A (en) | 2003-09-30 | 2004-09-30 | Method and apparatus for producing molten iron |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660017B (en) * | 2008-08-28 | 2011-04-13 | 宝山钢铁股份有限公司 | Process for refining molten iron by directly using low-grade iron ores |
| CN104451017A (en) * | 2014-11-28 | 2015-03-25 | 中冶赛迪工程技术股份有限公司 | Carburizing process for vanadium titano-magnetite direct reduced iron through shaft furnace |
| CN106232835A (en) * | 2013-12-20 | 2016-12-14 | 格瑞得有限责任公司 | Shaft (tower) furnace and the method operating described shaft (tower) furnace |
| CN115315533A (en) * | 2020-03-24 | 2022-11-08 | 米德雷克斯技术公司 | Integration of DR plant and electric DRI melting furnace for production of high performance iron |
-
2004
- 2004-09-30 CN CN 200480028077 patent/CN1894426A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660017B (en) * | 2008-08-28 | 2011-04-13 | 宝山钢铁股份有限公司 | Process for refining molten iron by directly using low-grade iron ores |
| CN106232835A (en) * | 2013-12-20 | 2016-12-14 | 格瑞得有限责任公司 | Shaft (tower) furnace and the method operating described shaft (tower) furnace |
| CN106232835B (en) * | 2013-12-20 | 2022-01-04 | 格瑞得有限责任公司 | Shaft furnace and method for operating the same |
| CN104451017A (en) * | 2014-11-28 | 2015-03-25 | 中冶赛迪工程技术股份有限公司 | Carburizing process for vanadium titano-magnetite direct reduced iron through shaft furnace |
| CN115315533A (en) * | 2020-03-24 | 2022-11-08 | 米德雷克斯技术公司 | Integration of DR plant and electric DRI melting furnace for production of high performance iron |
| US11788159B2 (en) | 2020-03-24 | 2023-10-17 | Midrex Technologies, Inc. | Integration of DR plant and electric DRI melting furnace for producing high performance iron |
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