CN107841587A - A kind of external-heat coal-based direct reduction iron shaft furnace process for layout and system - Google Patents
A kind of external-heat coal-based direct reduction iron shaft furnace process for layout and system Download PDFInfo
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- CN107841587A CN107841587A CN201711392681.0A CN201711392681A CN107841587A CN 107841587 A CN107841587 A CN 107841587A CN 201711392681 A CN201711392681 A CN 201711392681A CN 107841587 A CN107841587 A CN 107841587A
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- external
- direct reduction
- reduction iron
- based direct
- shaft furnace
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 46
- 230000009467 reduction Effects 0.000 title claims abstract description 38
- 239000003245 coal Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008569 process Effects 0.000 title claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 42
- 208000028659 discharge Diseases 0.000 claims description 53
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 4
- 238000006722 reduction reaction Methods 0.000 description 27
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000032258 transport Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Tunnel Furnaces (AREA)
Abstract
The present invention relates to a kind of external-heat coal-based direct reduction iron shaft furnace process for layout, the coal-based direct reduction iron that temperature is 300~400 degree after being cooled down in stove enters in material guide device, stove external cooling device is drained into by a discharge device, material buffer warehouse, mode through indirect water-cooling is cooled to less than 100 degree, subordinate's conveying device is expelled to by secondary discharge device again to transport outward, one time discharge device uses VFC, continuously or discontinuously runs；Secondary discharge device sets automatic start-stop, intermittent duty according to the level signals and time cumulation of material buffer warehouse.Present invention process is reasonable, realizes the closed cooling of shaft kiln directly reduced iron, and stable discharge, automatic control level is high, reduces labor strength, and environmental-protecting performance protrudes, and it is horizontal to improve producing equipment.And compact-sized reliable, the small, reduced investment of occupation of land, realizes the large-scale production of direct-reduction iron product.It is particularly suitable for mass producing, economic benefit and social benefit are notable.
Description
Technical field
It is more particularly to a kind of the present invention relates to cooling technology field outside the discharge and stove of shaft furnace production direct-reduction iron product
External-heat coal-based direct reduction iron shaft furnace process for layout.
Background technology
Direct reduction processes of Iron ores, refer under the melting temperature less than iron ore, solid-state iron in ore oxide is straight
The technical process for being reduced into metallic iron is connect, its product is called DRI (sponge iron) or metallized pellet.Direct-reduction
Iron can be as the pure raw material for smelting high-quality steel, special steel, can also be as techniques such as casting, ferroalloy, powder metallurgy
Iron-bearing material.
Direct reduction iron making technique is largely divided into two kinds of gas-based reduction and coal base reduction.Gas-based reduction method is produced at present
DRI account for more than the 90% of DRI total output, but the production of gas base directly reducing iron is by natural gas resource
The influence for the factors such as domain distribution limits, investment operating cost is higher, existing process gas base directly reducing iron production capacity significant increase are difficult
Degree increases.Using widely distributed coal or the semicoke easily prepared as reducing agent, the ball for coordinating lump ore or fine ore to be fired into
Group is used as iron-bearing material, and Coal-based Dri Technology technique obtains increasing concern and practicality in metallurgical industry field
Property achievement.
Coal-based direct reduction iron process unit can be largely classified into shaft furnace, rotary kiln, rotary hearth furnace, retort, tubular type at present
Stove etc. is concentrated.In numerous coal-based direct reduction iron techniques, most praised highly with shaft furnace technology.But the coal for practice of putting into production at present
In base shaft furnace production device, generally existing reduzate is during discharge and cooling down operation with air contact and secondary oxygen occurring
Change, while also because the current discharge scenario-frame complexity generally used, cooling-down effect, discharging efficiency are low, automaticity is not high
The shortcomings of, it is impossible to meet DRI large-scale production requirement.
The content of the invention
The technical problems to be solved by the invention be to provide a kind of external-heat coal-based direct reduction iron shaft furnace process for layout and
System, external-heat coal-based direct reduction iron shaft furnace discharge system have the characteristics of compact-sized, good cooling results, good airproof performance,
Effectively solves the deficiency of existing coal-based direct reduction iron shaft furnace discharge system.Improve the quality of production and the production of DRI
Efficiency, the requirement of DRI large-scale production can be met again.
To achieve the above object, the present invention is realized using following technical scheme：
A kind of external-heat coal-based direct reduction iron shaft furnace process for layout, temperature is 300~400 degree after being cooled down in stove
Coal-based direct reduction iron enters in material guide device, stove external cooling device is drained into by a discharge device, material buffer warehouse, between
The cold mode of water receiving is cooled to less than 100 degree, then is expelled to subordinate's conveying device by secondary discharge device and transports outward, a discharge
Device uses VFC, continuously or discontinuously runs；Secondary discharge device tires out according to the level signals and time of material buffer warehouse
Meter setting automatic start-stop, intermittent duty.
A described discharge device and secondary discharge device are bucket capacity form discharge device.
Described stove external cooling device is membranous wall formula water-cooling structure.
A kind of external-heat coal-based direct reduction iron shaft furnace discharge system, the external-heat coal-based direct reduction iron shaft furnace include
Upright body of heater, the discharge system are connected to the lower section of upright bottom of furnace body support crossbeam, including the eccentric guide being sequentially connected
Groove, once quantify blow-off valve, material buffer warehouse, stove external cooling device and secondary discharge control valve, secondary discharge control valve connection
Device for transporting objects；Rotor hopper, rotor material are equipped with the valve body for once quantifying blow-off valve and secondary discharge control valve
Bucket is driven by discharge motor, and the material buffer warehouse is cavity slot type structure, and the stove external cooling device uses membranous wall formula water cooling
Structure, include the cooling wall of sealing, heat exchange metal tube is arranged outside cooling wall, cooling water is passed through in the metal tube that exchanges heat.
Described eccentric deflector chute inner liner abrasive resistant plate, wearing plate surrounding are furnished with multigroup temperature-detecting device.
Described rotor hopper is bucket capacity format structure, including rotor, and more composition helical arrangements are provided with rotor circumference
Form hopper.
The material buffer warehouse short transverse is provided with multiple Non-contact type level gages.
Described stove external cooling device exit is provided with temperature-detecting device.
Described device for transporting objects is that the scrapper conveyor with inert gas shielding and ribbon conveyer or closed vibrations are defeated
Material machine.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) once quantify blow-off valve, the bucket capacity form valve that secondary discharge control valve is VFC, can both realize production
The quantitative discharge of product, the long uniformity declined to direction material can be ensured again, reach the purpose of steady production, also had and realize
Quickly, the features such as accurately adjusting discharge velocity, high temperature resistant.Discharge and the adjustment of coal base shaft furnace production DRI can be met
The requirement of whole device produce load.
(2) material buffer warehouse is the slot type structure with level-sensing device, is realized after DRI product cooling by secondary discharge
Automatically controlling for valve and follow-up discharge system periodic running, reduces the abrasion and energy resource consumption of equipment to a certain extent.And
Material position regulation and the time control of stove external cooling device can be realized within the specific limits, so as to reach dump temperature in buffering stove
The effect of fluctuation.It can ensure that DRI carries out the residence time of reduction reaction, so as to ensure the production of DRI
Quality.
(3) stove external cooling device uses membranous wall formula water-cooling structure, completes high temperature reduction iron material with exchanging heat in metal tube
Recirculated water exchanges heat, and reduces reduced iron temperature of charge.Membranous wall formula cooler has good airproof performance, heat transfer property height, Temperature Distribution equal
Even, the features such as structural strength is high.
(4) discharge system is complete closed structure, avoids high-temperature direct reduced iron from discharging and contacting sky in cooling procedure
Gas, secondary oxidation.
(5) rational technology, the closed cooling of shaft kiln directly reduced iron is realized, stable discharge, automatic control level is high, reduces
Labor strength, environmental-protecting performance protrude, and it is horizontal to improve producing equipment.And compact-sized reliable, the small, reduced investment of occupation of land, it is real
Now it is reduced directly the large-scale production of iron product.It is particularly suitable for mass producing, economic benefit and social benefit are notable.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the structural side view of the present invention.
Fig. 3 is once to quantify blow-off valve, secondary discharge control valve structure chart.
Fig. 4 is rotor hopper construction schematic diagram.
Fig. 5 is stove external cooling device structural representation.
In figure：Eccentric deflector chute 1, once quantify blow-off valve 2, material buffer warehouse 3, stove external cooling device 4, secondary discharge control
Valve 5 processed, the contactless electromagnetic wave level-sensing device 6 of low level, high-order contactless electromagnetic wave level-sensing device 7, electric thermo-couple temperature detection means
One 8, electric thermo-couple temperature detection means 29, device for transporting objects 10, valve body 11, rotor hopper 12, rotor 13, form hopper 15,
Cooling wall 16, heat exchange metal tube 17.
Embodiment
The embodiment of the present invention is further illustrated below in conjunction with the accompanying drawings：
Such as Fig. 1-Fig. 4, a kind of external-heat coal-based direct reduction iron shaft furnace discharge system, the external-heat coal-based direct reduction
Iron shaft furnace includes upright body of heater, and the discharge system is connected to the lower section of upright bottom of furnace body support crossbeam, including is sequentially connected
Eccentric deflector chute 1, once quantify blow-off valve 2, material buffer warehouse 3, stove external cooling device 4 and secondary discharge control valve 5, it is secondary
Discharge control valve 5 connects device for transporting objects 10；
Eccentric deflector chute 1 is connected to the lower section of reduction shaft furnace room, the eccentric inner liner abrasive resistant plate of deflector chute 1, wearing plate surrounding cloth
There is multigroup temperature-detecting device.Temperature is that 300~400 degree of coal-based direct reduction iron enters eccentric guide after being cooled down in stove
In groove 1.The eccentric discharging opening of deflector chute 1 connection once quantifies blow-off valve 2, and the chute of eccentric structure reduces furnace charge normal pressure to once
The influence of quantitative blow-off valve 2.
Once quantify the lower section of blow-off valve 2 connection material buffer warehouse 3, material buffer warehouse 3 is cavity slot type structure, material buffer
The short transverse of storehouse 3 is provided with multiple Non-contact type level gages.The lower section of material buffer warehouse 3 connection stove external cooling device 4, stove cools down outside
Device 4 uses membranous wall formula water-cooling structure, includes the cooling wall 16 of sealing, the outside of cooling wall 16 arrangement heat exchange metal tube 17, heat exchange
Cooling water is passed through in metal tube 17.The exit of stove external cooling device 4 is provided with temperature-detecting device.DRI process is once fixed
Amount blow-off valve 2, material buffer warehouse 3 enter stove external cooling device 4, and less than 100 degree are dropped to through indirect type of cooling temperature of charge.
The lower section connecting secondary discharge control valve 5 of stove external cooling device 4.Once quantify blow-off valve 2 and secondary discharge control valve 5
Valve body 11 in be equipped with rotor hopper 12, rotor hopper 12 is bucket capacity format structure, including rotor 13, on the circumference of rotor 13
Form hopper 15 provided with more composition helical arrangements.Rotor hopper is driven by discharge motor 14, and discharge motor 14 uses frequency conversion control
System.Blow-off valve 2 is once quantified continuously or discontinuously to run；Secondary discharge control valve 5 is timely according to the level signals of material buffer warehouse
Between add up setting automatic start-stop, intermittent duty.
The secondary lower section of discharge control valve 5 connection device for transporting objects.Material through being cooled down outside stove passes through secondary discharge control again
Valve 5 processed is expelled to subordinate's conveying device outward transport.
Embodiment
A kind of external-heat coal-based direct reduction iron shaft furnace discharge system, the external-heat coal-based direct reduction iron shaft furnace include
Upright body of heater, the discharge system are connected to the lower section of upright bottom of furnace body support crossbeam, including the eccentric guide being sequentially connected
Groove 1, once quantify blow-off valve 2, material buffer warehouse 3, stove external cooling device 4 and secondary discharge control valve 5, secondary discharge control valve
5 connection device for transporting objects；
Eccentric deflector chute 1 is connected to the lower section of reduction shaft furnace room, the eccentric inner liner abrasive resistant plate of deflector chute 1, wearing plate surrounding cloth
There is multigroup electric thermo-couple temperature detection means 1.Temperature is that 300~400 degree of coal-based direct reduction iron enters after being cooled down in stove
Enter in eccentric deflector chute 1.The eccentric discharging opening of deflector chute 1 connection once quantifies blow-off valve 2, and the chute of eccentric structure is reducing furnace charge just
Pressure is to the once quantitatively influence of blow-off valve 2.
Once quantify the lower section of blow-off valve 2 connection material buffer warehouse 3, material buffer warehouse 3 is cavity slot type structure, material buffer
High-order contactless electromagnetic wave level-sensing device 7 and the contactless electromagnetic wave level-sensing device 6 of low level are provided with storehouse 3.The lower section of material buffer warehouse 3
Stove external cooling device 4 is connected, stove external cooling device 4 uses membranous wall formula water-cooling structure, includes the cooling wall 16 of sealing, cooling wall 16
Outside arranges heat exchange metal tube 17, and cooling water is passed through in the metal tube 17 that exchanges heat.The exit of stove external cooling device 4 is provided with thermocouple temperature
Spend detection means 29.DRI is by once quantifying blow-off valve 2, material buffer warehouse 3 enters stove external cooling device 4, passes through
Indirect type of cooling temperature of charge drops to less than 100 degree.
The lower section connecting secondary discharge control valve 5 of stove external cooling device 4.Once quantify blow-off valve 2 and secondary discharge control valve 5
Valve body 11 in be equipped with rotor hopper 12, rotor hopper 12 is bucket capacity format structure, including rotor 13, on the circumference of rotor 13
Form hopper 15 provided with more composition helical arrangements.Rotor hopper is driven by discharge motor 14, and discharge motor 14 uses frequency conversion control
System.Blow-off valve 2 is once quantified continuously or discontinuously to run；Secondary discharge control valve 5 is timely according to the level signals of material buffer warehouse
Between add up setting automatic start-stop, intermittent duty.
The secondary lower section of discharge control valve 5 connection closed vibrations conveyer.Material through being cooled down outside stove passes through secondary row again
Material control valve 5 is expelled to closed vibrations conveyer outward transport.
The secondary lower section of discharge control valve 5 can be with the scrapper conveyor of connect band inert gas shielding, scrapper conveyor lower section connect band
Formula conveyer.
Described above is only the general principle of the present invention, and not the present invention is imposed any restrictions, every right according to the present invention
It carries out equivalent variations and modification, within the category of the art of this patent protection scheme.
Claims (9)
1. a kind of external-heat coal-based direct reduction iron shaft furnace process for layout, it is characterised in that temperature is 300 after being cooled down in stove
~400 degree of coal-based direct reduction iron enters in material guide device, is drained into outside stove and cooled down by a discharge device, material buffer warehouse
Device, the mode through indirect water-cooling is cooled to less than 100 degree, then is expelled to by secondary discharge device outside subordinate's conveying device
Fortune, one time discharge device uses VFC, continuously or discontinuously runs；Secondary discharge device is believed according to the material position of material buffer warehouse
Number and time cumulation setting automatic start-stop, intermittent duty.
2. a kind of external-heat coal-based direct reduction iron shaft furnace process for layout according to claim 1, it is characterised in that described
A discharge device and secondary discharge device be bucket capacity form discharge device.
3. a kind of external-heat coal-based direct reduction iron shaft furnace process for layout according to claim 1, it is characterised in that described
Stove external cooling device be membranous wall formula water-cooling structure.
4. a kind of discharge system of external-heat coal-based direct reduction iron shaft furnace process for layout according to claim 1, described
External-heat coal-based direct reduction iron shaft furnace includes upright body of heater, and the discharge system is connected to upright bottom of furnace body support crossbeam
Lower section, it is characterised in that including be sequentially connected eccentric deflector chute, once quantify blow-off valve, material buffer warehouse, cool down dress outside stove
Put and secondary discharge control valve, secondary discharge control valve connect device for transporting objects；It is described once to quantify blow-off valve and secondary row
Expect to be equipped with rotor hopper in the valve body of control valve, rotor hopper is driven by discharge motor, and the material buffer warehouse is cavity groove
Formula structure, the stove external cooling device use membranous wall formula water-cooling structure, include the cooling wall of sealing, heat exchange is arranged outside cooling wall
Metal tube, exchange heat metal tube in be passed through cooling water.
5. a kind of discharge system of external-heat coal-based direct reduction iron shaft furnace process for layout according to claim 4, it is special
Sign is that described eccentric deflector chute inner liner abrasive resistant plate, wearing plate surrounding is furnished with multigroup temperature-detecting device.
6. a kind of discharge system of external-heat coal-based direct reduction iron shaft furnace process for layout according to claim 4, it is special
Sign is, described rotor hopper is bucket capacity format structure, including rotor, and more composition helical arrangements are provided with rotor circumference
Form hopper.
7. a kind of discharge system of external-heat coal-based direct reduction iron shaft furnace process for layout according to claim 4, it is special
Sign is that the material buffer warehouse short transverse is provided with multiple Non-contact type level gages.
8. a kind of discharge system of external-heat coal-based direct reduction iron shaft furnace process for layout according to claim 4, it is special
Sign is that described stove external cooling device exit is provided with temperature-detecting device.
9. a kind of discharge system of external-heat coal-based direct reduction iron shaft furnace process for layout according to claim 4, it is special
Sign is that described device for transporting objects is that the scrapper conveyor with inert gas shielding and ribbon conveyer or closed shake conveying
Machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711392681.0A CN107841587A (en) | 2017-12-21 | 2017-12-21 | A kind of external-heat coal-based direct reduction iron shaft furnace process for layout and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711392681.0A CN107841587A (en) | 2017-12-21 | 2017-12-21 | A kind of external-heat coal-based direct reduction iron shaft furnace process for layout and system |
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| Publication Number | Publication Date |
|---|---|
| CN107841587A true CN107841587A (en) | 2018-03-27 |
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ID=61684304
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711392681.0A Pending CN107841587A (en) | 2017-12-21 | 2017-12-21 | A kind of external-heat coal-based direct reduction iron shaft furnace process for layout and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114854932A (en) * | 2022-05-31 | 2022-08-05 | 中冶京诚工程技术有限公司 | Scraper type hot direct reduced iron conveying device and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4252299A (en) * | 1979-01-08 | 1981-02-24 | United States Steel Corporation | Method and apparatus for discharging material from a shaft furnace |
| US6214086B1 (en) * | 1999-08-20 | 2001-04-10 | Midrex International B.V. Rotterdam, Zurich Branch | Direct reduced iron discharge system and method |
| CN102925614A (en) * | 2012-11-22 | 2013-02-13 | 中冶赛迪工程技术股份有限公司 | Material discharge device for vertical furnace |
| CN106802088A (en) * | 2017-02-24 | 2017-06-06 | 中冶焦耐(大连)工程技术有限公司 | A kind of hot direct reduced iron stove external cooling device and method |
-
2017
- 2017-12-21 CN CN201711392681.0A patent/CN107841587A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4252299A (en) * | 1979-01-08 | 1981-02-24 | United States Steel Corporation | Method and apparatus for discharging material from a shaft furnace |
| US6214086B1 (en) * | 1999-08-20 | 2001-04-10 | Midrex International B.V. Rotterdam, Zurich Branch | Direct reduced iron discharge system and method |
| CN102925614A (en) * | 2012-11-22 | 2013-02-13 | 中冶赛迪工程技术股份有限公司 | Material discharge device for vertical furnace |
| CN106802088A (en) * | 2017-02-24 | 2017-06-06 | 中冶焦耐(大连)工程技术有限公司 | A kind of hot direct reduced iron stove external cooling device and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114854932A (en) * | 2022-05-31 | 2022-08-05 | 中冶京诚工程技术有限公司 | Scraper type hot direct reduced iron conveying device and method |
| CN114854932B (en) * | 2022-05-31 | 2023-08-15 | 中冶京诚工程技术有限公司 | Scraper type hot direct reduced iron conveying device and method |
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Application publication date: 20180327 |