CN109971906A - A kind of restoring method of ultralow carbon emission production sponge iron - Google Patents
A kind of restoring method of ultralow carbon emission production sponge iron Download PDFInfo
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- CN109971906A CN109971906A CN201910286912.2A CN201910286912A CN109971906A CN 109971906 A CN109971906 A CN 109971906A CN 201910286912 A CN201910286912 A CN 201910286912A CN 109971906 A CN109971906 A CN 109971906A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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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
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C21B2100/06—
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The present invention provides a kind of restoring method of ultralow carbon emission production sponge iron, comprising: hydrogen rich feedstock gas is passed through in heating furnace, after heating, into shaft furnace, reducing iron ore produces sponge iron.In the present invention, the furnace roof tail gas of shaft furnace discharge is sufficiently recycled without outlet, be conducive to save the magnitude of recruitment of hydrogen rich feedstock gas, by the way that heat-pipe heat exchanger is arranged, heat exchange efficiency is high, while reducing exhaust temperature, waste heat from tail gas is sufficiently recycled by way of by-product low-pressure steam, has been conducive to energy saving.By the way that wet desulphurization device is arranged, desulfurization effect is good, not only makes full use of low-pressure steam as heat source needed for itself, has also further purified furnace roof tail gas, reduces H in tail gas2To the erosion of pipeline and equipment in S sulfides, it is conducive to extend service life of equipment.
Description
Technical field
The present invention relates to metallurgical technology fields, more particularly to a kind of restoring method of ultralow carbon emission production sponge iron.
Background technique
Direct reduction iron making technique is to realize that steel production short route, i.e. steel scrap/direct reduced iron-electric furnace route are important
Link.Compared with traditional blast furnace process, direct reduction iron making process is shorter with process, do not have to coking coal, energy-saving and emission-reduction are imitated
The apparent technical advantage of fruit is that steel and iron industry gets rid of coking coal resource yoke, reduces energy consumption, reduce CO2Discharge improves steel products
Structure improves an important development direction of steel products quality.
Gas-based shaft kiln method is the direct reduction processes of Iron ores of world today's mainstream.At present using the straight of process production
Connect reduced iron (i.e. sponge iron) accounts for whole world sponge iron total output 80% or more.With the widest Midrex method of foreign applications and
For HYL method, process units is essentially all to use the method for gas renormalizing to produce with rich CO+H2Based on also Primordial Qi
Sponge iron is produced, since there are the CO gas of ratio not isometric in 15%~35% range in also Primordial Qi, into shaft furnace
It is easy to cause the aggravation of reduction of iron ore dusting, part analyses carbon and covers influence coal gas gas permeability, when serious or causes material in furnace
Cohere the phenomena such as of being unfavorable for shaft furnace direct motion such as agglomerating；In addition, in reducing gas CO gas presence, cause coal gas in heating process
In in 450 DEG C~600 DEG C temperature sections will be based on CO or in 800 DEG C~950 DEG C temperature sections with CH4Based on analysis carbon phenomenon produce
It is raw, boiler tube can be blocked when serious, influence the normal operation of equipment；Furthermore after heating fuel generally uses top coal gas Treatment for Reuse
Carbonaceous coal gas, there is also CO in the discharged gas fume generated after burning2Discharge, be unfavorable for environmental requirement.
Studies in China exploitation in China's is the Shaft Furnace Direct Reduction Process of gas source with coal gas, coke-stove gas etc., is proposed
A variety of different technology paths for producing also Primordial Qi, be substantially it is similar with gas renormalizing mode, it is final to generate with CO+H2
Based on also Primordial Qi enter reduction shaft furnace iron ore, wherein coal gas generate it is effective CO ratio is higher also in Primordial Qi, it is general high
Up to 60% or more, in effective gas that converting coke oven gas generates CO generally 10%~20% range, equally exist above-mentioned adopt
Similar technological deficiency during sponge iron is produced with gas renormalizing method.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of ultralow carbon emissions to produce sponge
There is the CO of analysis carbon phenomenon, generation in the restoring method of iron when for solving and produce sponge iron in the prior art2Gaseous contamination environment
The problems such as.
In order to achieve the above objects and other related objects, the present invention provides a kind of reduction of ultralow carbon emission production sponge iron
Method, comprising: hydrogen rich feedstock gas is passed through in heating furnace, after heating, into shaft furnace, reducing iron ore produces sponge iron.
Optionally, H in the hydrogen rich feedstock gas2Volume accounting >=80%.
Optionally, the other components of the hydrogen rich feedstock gas are N2And H2O, volume accounting≤20% of the two.
Optionally, the hydrogen rich feedstock gas is by purification, explosion limit measurement and pressure regulation processing.
Optionally, the gas of the shaft furnace discharge is after dedusting, waste heat recycling, reducing temperature twice, desulfurization and pressurization, and one
Divide gas to enter the heating furnace as also Primordial Qi, temperature raising is heated in heating furnace.
Optionally, the gas mixing in another part gas and the heating furnace exhaust pipe, is realized to heating furnace outlet
Cooling, reach the temperature requirement into shaft furnace.
Optionally, the method that desulfurization uses is selected from methyl diethanolamine method (MDEA method), certainly, is not limited to the above method,
Other wet desulfurizing process can also be used.
Optionally, furnace gas is warming up to 900 DEG C~1100 DEG C by the heating furnace.
Optionally, the heating furnace is tubular heater (indirect heat exchange mode) or hot-blast stove (heat accumulating type intermittent-heating side
Formula).
It optionally, is 850 DEG C~1050 DEG C into the reducing gas temperature of the shaft furnace.
Optionally, into the reducing gas of the shaft furnace, H2O and H2+H2Volume ratio≤10% of O.
It optionally, is 0.1MPa~0.3MPa into the reducing gas pressure of the shaft furnace.
Optionally, the iron ore is selected from least one of bloodstone, magnetic iron ore, siderite, schreyerite, lump ore, leads to
In normal situation, single iron ore material is restored, in other words, containing 100% (quality) in the iron ore of shaft furnace
Bloodstone, perhaps the magnetic iron ore containing 100% (quality) perhaps the siderite containing 100% (quality) or contains 100%
The siderite of (quality), or contain the lump ore of 100% (quality).
Specifically, the iron ore is specifically as follows bloodstone acid pellet, magnetic iron ore acid pellet, siderite oxidation ball
Group, schreyerite acid pellet or lump ore.
Optionally, dedusting method is hot cyclone dust removal.
Optionally, the furnace roof waste heat from tail gas recycling of the shaft furnace is specific by the way of heat pipe-type or coiled heat exchange, warp
Waste heat furnace roof tail gas after the recovery is cooled to 150 DEG C~220 DEG C.
Optionally, (gauge pressure is 1.0MPa~1.5MPa, temperature 200 to the low-pressure steam of the waste heat recycling step by-product
DEG C~220 DEG C) enter the desulfurized step, for providing heat source for the desulfurized step.
Optionally, waste heat tail gas after the recovery is cooled down twice by the way of wet scrubbing, after reducing temperature twice
Exhaust temperature≤40 DEG C, tail gas dustiness < 10mg/m3。
Optionally, the tail gas H after desulfurization2S content < 20mg/m3。
Optionally, the heating furnace does not generate CO using the hydrogen rich feedstock gas as fuel2Isothermal chamber gas.
Optionally, the partial tail gas after desulfurization enters the heating furnace as fuel gas, certainly, is usually being used as reduction
The gas of gas have it is more than needed in the case where, desulfurized step just has portion gas can be into heating furnace as fuel gas.
The present invention also provides sponge iron made from the above method.
As described above, a kind of restoring method of ultralow carbon emission production sponge iron of the invention, at least has beneficial below
Effect: 1, the present invention prepares sponge iron using the hydrogen rich gas of high hydrogen ratio to produce, and the reduction efficiency of iron ore is high in shaft furnace, no
Generation is cohered, and no analysis carbon phenomenon, reduction and pulverization ratio is lower, and sulfide is further removed in ore, the gold of the sponge iron of acquisition
Category rate is higher, is conducive to the degree of purity and grade grade that further promote shaft furnace product composition.
2, it eliminates heating process without carbonaceousfuel components such as CO in unstripped gas of the invention and is covered since CO analysis carbon generates carbon dust
Heat exchanging adverse effect (in the prior art, carbon dust covers the effective heat exchange area that can reduce heat exchanger tube inside and outside medium, thus
Reduce heating furnace temperature raising efficiency, analysis carbon it is serious when or influence heating furnace normal operation), tubular heater can be directly used
Or the devices such as hot-blast stove carry out a step heating, simplify the arrangement of heating device, reduce the cost of investment of equipment.
3, heating furnace of the invention using the top gas after hydrogen rich feedstock gas or circular treatment as fuel, in efflux gas
It is practically free of CO2、SO2Etc. gas componants, green minimum discharge may be implemented, there is more apparent advantage in terms of environment protection emission.
4, the top gas of shaft furnace discharge of the present invention is sufficiently recycled, no outlet, is conducive to save supplement gas dosage, work
Heat-pipe heat exchanger is set in skill process, and heat exchange efficiency is high, has recycled waste heat from tail gas in a manner of by-product low-pressure steam, has been conducive to
Energy saving；Wet desulphurization device is set in process flow, desulfurization effect is good, the self-produced heat source of process is not only utilized, also into
One step reduces H in tail gas2The content of S sulfides is conducive to extend service life of equipment.
Detailed description of the invention
Fig. 1 is shown as the reducing process flow chart of the ultralow carbon emission production sponge iron of the embodiment of the present invention.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
In recent years, as China's nuclear energy technology continues to develop, the 4th generation of technology such as nuclear energy system technology is increasingly mature, utilizes nuclear energy
The scale application verifying of continuous hydrogen production technique also achieves important breakthrough, and the scale of hydrogen-rich gas is carried out using Clear nuclear energy
Change, economic production have pointed the day and await for it.It is combined using nuclear energy continuous hydrogen production with Ferrous Metallurgy, realizes the rule of hydrogen metallurgical technology
Mould application, or will be that iron and steel enterprise gets rid of traditional carbonaceous fossil energy obstacle, breaks through environment constraint, realizes cleaning Green Development
Active path.
A kind of direct-reduction technique of ultralow carbon emission production sponge iron provided by the invention is right below in conjunction with attached drawing
The preferred embodiment of the present invention is described in detail:
As shown in Figure 1, the hydrogen rich feedstock gas by purification, explosion limit measurement and pressure regulation processing, wherein H2Volume ratio
Example content >=80%, other components (N2+H2O volume ratio content) meets≤20% hydrogen rich feedstock gas and shaft furnace discharge
Furnace roof tail gas after tails dedusting, waste heat recycling, reducing temperature twice, desulfurization and pressurization enters temperature raising of being heated in heating furnace together,
Due to being free of the carbonaceous gas such as CO in unstripped gas, generated in heating process without analysis carbon, the mode that can directly adopt step heating is come
The temperature of tail gas is promoted, the high-temperature tail gas temperature that heated fire grate goes out is removed up to 900 DEG C~1100 DEG C, then with part through tail gas
Furnace roof tail gas after dirt, waste heat recycling, reducing temperature twice, desulfurization and pressurization is blended, after reducing mixed tail gas temperature, into perpendicular
Furnace produces sponge iron；The high-temperature tail gas of heating furnace discharge and part through tails dedusting, waste heat recycling, reducing temperature twice, desulfurization and add
The temperature range for the also Primordial Qi that furnace roof tail gas after pressure is formed after being blended is 850 DEG C~1050 DEG C, also H in Primordial Qi2O and H2+
H2Volume ratio≤10% of O, the also gauge pressure of Primordial Qi are 0.1MPa~0.3MPa.
Meanwhile the furnace roof tail gas being discharged at the top of shaft furnace big portion after dedusting, waste heat recycling, reducing temperature twice, desulfurization and pressurization
Divide and enters heating furnace together with the hydrogen rich feedstock gas of supplement, blending cooling air of a part as heating furnace output high-temperature tail gas.
When it is implemented, entering between the furnace roof tail gas of heating furnace and the furnace roof tail gas as blending cooling air together with hydrogen rich feedstock gas
Allocation proportion need to determine according to actual process condition.
Above-mentioned " major part ", general volume ratio range is 50%~100%, and specific allocation proportion needs foundation
Actual process condition determines, is also required to debug in production, using different device, into the hydrogen-rich feed gas product ratio of heating furnace
It will be different.
In one embodiment, the furnace roof tails dedusting of shaft furnace discharge uses hot cyclone dust removal technique, and effect is preferable, can
Achieve the purpose that tail gas rough dedusting under conditions of not cooling down to realize.
In one embodiment, the furnace roof waste heat from tail gas recycling of shaft furnace discharge uses heat-pipe heat exchanger, after exchanging heat
Tail gas is cooled to 150 DEG C~220 DEG C, and the low pressure that the pressure of by-product is 1.0MPa~1.5MPa, temperature is 200 DEG C~220 DEG C is steamed
Vapour can be used for tail gas desulfurization process.
In one embodiment, the furnace roof tail gas of shaft furnace discharge is cooled down twice using annular seam washing tower, after cooling
Exhaust temperature is 40 DEG C, tail gas dustiness < 10mg/m3。
In one embodiment, the furnace roof tail gas desulfurization of shaft furnace discharge uses wet desulfurizing process, waste heat from tail gas recycling
The low-pressure steam of by-product can provide heat source, the tail gas H after desulfurization for desulfurization2S content < 20mg/m3。
Currently, wet desulfurizing process in chemical industry using relatively broad, belong to mature technology, we are by chemical industry maturation
Desulfurization technology be applied to iron and steel smelting industry methyl diethanolamine method (MDEA method) is usually used and is used in conjunction with the present invention
The desulfurization process of furnace roof tail gas in this patent, the method have the characteristics that technical maturity is reliable, the production domesticization of stable and technology.
In one embodiment, the heating furnace is by the way of tubular heater indirect heat exchange, and heating raw material can be with
Using hydrogen rich feedstock gas and/or the furnace roof tail gas after tails dedusting, waste heat recycling, reducing temperature twice, desulfurization.
Further explaination is done to technical solution of the present invention below by way of specific embodiment:
Embodiment 1
Schreyerite sponge iron is produced using technique reduction vanadium titano-magnetite
H2Volume ratio is 90%, N2Volume ratio is 2%, H2The room temperature hydrogen rich feedstock gas that O volume ratio is 8% passes through
After purification, explosion limit measurement and pressure regulation processing, unstripped gas gauge pressure is 0.2MPa, with shaft furnace discharge through tails dedusting, waste heat
Furnace roof tail gas after recycling, reducing temperature twice, desulfurization and pressurization enters tubular heater together and further lifts temperature to 980 DEG C, tubular type
Furnace roof tail gas of the high-temperature tail gas and part of heating furnace discharge after tails dedusting, waste heat recycling, reducing temperature twice, desulfurization and pressurization
After being blended, the flow and preheating temperature of control blending cold air, the reduction tail gas that formation temperature is 950 DEG C are restored in tail gas
H2O and H2+H2The volume ratio of O is 9%, and reduction gas meter pressure is 0.2MPa, then is passed through reduction shaft furnace V-ti Bearing Magnetite Pellets production sea
Continuous iron, the degree of metalization of the vanadium titano-magnetite sponge iron of production are 91.3%.
Meanwhile the furnace roof exhaust temperature being discharged at the top of shaft furnace is 450 DEG C, successively through overheat cyclone dust removal and heat pipe type heat exchanger
After device, it is cooled to 210 DEG C, while by-product 1.3MPa, 210 DEG C of low-pressure steam, the tail gas after heat-pipe heat exchanger enters washing
Tower through reducing temperature twice dedusting to 40 DEG C, tail gas dustiness 8mg/m3, the rear H into wet desulphurization device removing tail gas2S content is extremely
18mg/m3, tail gas pressure then is pressurizeed to 0.2MPa by pressuring machine, and the tail gas after pressurization is most of together with hydrogen rich feedstock gas
Into tubular heater, a part removes the high-temperature tail gas of blending tubular heater discharge, adjusts to the also Primordial Qi for entering shaft furnace
Temperature reaches shaft furnace to the temperature requirement of also Primordial Qi.
1 schreyerite of table restores forward and backward component tables of data
Embodiment 2
Common pelletizing production high-quality sponge iron is restored using the technique
H2Volume ratio is 96%, N2Volume ratio is 2%, H2The room temperature hydrogen rich feedstock gas that O volume ratio is 2% passes through
Purification, explosion limit measurement and pressure regulation raw materials treated gas meter pressure are 0.25MPa, with shaft furnace discharge through tails dedusting, remaining
Furnace roof tail gas after recuperation of heat, reducing temperature twice, desulfurization and pressurization enters the further temperature raising of tubular heater, tubular heater together
The high-temperature tail gas temperature of discharge is 930 DEG C, then with part after tails dedusting, waste heat recycling, reducing temperature twice, desulfurization and pressurization
After furnace roof tail gas is blended, by the flow of control blending cold air, the reduction tail gas that formation temperature is 900 DEG C restores tail gas
Middle H2O and H2+H2The volume ratio of O is 10%, and reduction gas meter pressure is 0.25MPa, then is passed through the common iron ore oxidation ball of perpendicular furnace reduction
It rolls into a ball to produce sponge iron, the degree of metalization of the sponge iron of production is 94%.
Meanwhile the furnace roof exhaust temperature being discharged at the top of shaft furnace is 430 DEG C, successively through overheat cyclone dust removal and heat pipe type heat exchanger
200 DEG C, while by-product 1.2MPa, 200 DEG C of low-pressure steam are cooled to after device, into scrubbing tower through reducing temperature twice dedusting to 40
DEG C, tail gas dustiness 6mg/m3, the rear H into wet desulphurization device removing tail gas2S content is to 15mg/m3, then through being overpressurized
Tail gas pressure is promoted to 0.25MPa, the tail gas after pressurization largely enters tubular heater together with hydrogen rich feedstock gas, a part
The high-temperature tail gas for going blending tubular heater discharge carries out temperature adjustment to the also Primordial Qi for entering shaft furnace, reaches shaft furnace to reduction
The temperature requirement of gas.
The common mine of table 2 restores forward and backward component tables of data
By above-mentioned two specific embodiment it is found that present invention employs the hydrogen rich feedstock gas of high hydrogen ratio, in shaft furnace
The reduction efficiency of iron ore is high, and the degree of metalization for restoring the sponge iron of acquisition is higher, and the vanadium-titanium ore pellets in furnace, which do not generate, to be cohered,
Without analysis carbon phenomenon, pulverization rate is lower, and the sulfide in ore is further removed, be conducive to improve shaft furnace product degree of purity and
Overall quality.
Also, since hydrogen rich off gas is without carbonaceousfuel components such as CO, the adverse effect of heating process analysis carbon is eliminated, it can be direct
One step heating is carried out using tubular heater, simplifies the arrangement of heating device, further reduced equipment investment cost；In addition,
Due to heating furnace using the top gas after hydrogen rich feedstock gas or circular treatment as fuel, be practically free of CO in efflux gas2、SO2
Equal gases have more apparent advantage, it can be achieved that green minimum discharge on environment protection emission.
Finally, the furnace roof tail gas of shaft furnace discharge is sufficiently recycled without outlet, be conducive to the benefit for saving hydrogen rich feedstock gas
Charge, by the way that heat-pipe heat exchanger is arranged, heat exchange efficiency is high, while reducing exhaust temperature, passes through the side of by-product low-pressure steam
Formula has sufficiently recycled waste heat from tail gas, is conducive to energy saving.By the way that wet desulphurization device is arranged, desulfurization effect is good, not only sufficiently
Using low-pressure steam as heat source needed for itself, furnace roof tail gas has also further been purified, has reduced H in tail gas2It is right in S sulfides
The erosion of pipeline and equipment, is conducive to extend service life of equipment.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (10)
1. a kind of restoring method of ultralow carbon emission production sponge iron characterized by comprising hydrogen rich feedstock gas is passed through heating
In furnace, after heating, into shaft furnace, reducing iron ore produces sponge iron.
2. restoring method according to claim 1, it is characterised in that: H in the hydrogen rich feedstock gas2Volume accounting >=
80%.
3. restoring method according to claim 2, it is characterised in that: the other components of the hydrogen rich feedstock gas are N2With
H2O, volume accounting≤20% of the two.
4. restoring method according to claim 1, it is characterised in that: the gas of the shaft furnace discharge passes through dedusting, waste heat
After recycling, reducing temperature twice, desulfurization and pressurization, a part of gas enters the heating furnace as also Primordial Qi, is added in heating furnace
Hot temperature raising.
5. restoring method according to claim 4, it is characterised in that: in another part gas and heating furnace exhaust pipe
Gas mixing realizes the cooling to heating furnace outlet, reaches the temperature requirement into shaft furnace.
6. restoring method according to claim 4 or 5, it is characterised in that: the method that desulfurization uses is selected from methyl diethanol
Amine method (MDEA method).
And/or 150 DEG C~220 DEG C are cooled to through waste heat furnace roof tail gas after the recovery.
7. restoring method according to claim 4 or 5, it is characterised in that: the low pressure of the waste heat recycling step by-product is steamed
Vapour enters the desulfurized step, for providing heat source for the desulfurized step.
8. restoring method according to claim 4 or 5, it is characterised in that: recycled by the way of wet scrubbing to waste heat
Tail gas later is cooled down twice, exhaust temperature≤40 DEG C after reducing temperature twice, tail gas dustiness < 10mg/m3；
And/or the tail gas H after desulfurization2S content < 20mg/m3；
And/or the partial tail gas after desulfurization enters the heating furnace as fuel gas；
And/or the heating furnace uses hydrogen rich feedstock gas as fuel gas.
9. restoring method according to claim 1, it is characterised in that: furnace gas is warming up to 900 DEG C by the heating furnace
~1100 DEG C；
And/or the heating furnace is tubular heater or hot-blast stove；
And/or into the shaft furnace reducing gas temperature be 850 DEG C~1050 DEG C；
And/or into the reducing gas of the shaft furnace, H2O and H2+H2Volume ratio≤10% of O；
And/or into the shaft furnace reducing gas pressure be 0.1MPa~0.3MPa；
And/or the iron ore is selected from least one of bloodstone, magnetic iron ore, siderite, schreyerite, lump ore.
10. sponge iron made from restoring method described in -9 any one according to claim 1.
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| CN113373274A (en) * | 2021-06-15 | 2021-09-10 | 中冶赛迪工程技术股份有限公司 | Coal gas treatment process for full hydrogen shaft furnace |
| SE2150290A1 (en) * | 2021-03-12 | 2022-09-13 | Greeniron H2 Ab | Method and system for producing direct reduced metal |
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| CN111961783A (en) * | 2020-07-29 | 2020-11-20 | 辽宁科技大学 | Sponge iron production system and production process |
| SE2150290A1 (en) * | 2021-03-12 | 2022-09-13 | Greeniron H2 Ab | Method and system for producing direct reduced metal |
| WO2022191754A1 (en) * | 2021-03-12 | 2022-09-15 | Greeniron H2 Ab | Method and system for producing direct reduced metal |
| SE544879C2 (en) * | 2021-03-12 | 2022-12-20 | Greeniron H2 Ab | Method and system for producing direct reduced metal |
| CN113373274A (en) * | 2021-06-15 | 2021-09-10 | 中冶赛迪工程技术股份有限公司 | Coal gas treatment process for full hydrogen shaft furnace |
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Application publication date: 20190705 |