LU504480B1 - Production device for direct reduced iron - Google Patents
Production device for direct reduced iron Download PDFInfo
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- LU504480B1 LU504480B1 LU504480A LU504480A LU504480B1 LU 504480 B1 LU504480 B1 LU 504480B1 LU 504480 A LU504480 A LU 504480A LU 504480 A LU504480 A LU 504480A LU 504480 B1 LU504480 B1 LU 504480B1
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- Prior art keywords
- section
- furnace
- reduction
- cooling
- reduction furnace
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 230000009467 reduction Effects 0.000 claims abstract description 103
- 239000007789 gas Substances 0.000 claims abstract description 61
- 238000001816 cooling Methods 0.000 claims abstract description 56
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 18
- 230000007704 transition Effects 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 8
- 239000011449 brick Substances 0.000 claims description 7
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 4
- 239000010962 carbon steel Substances 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 description 17
- 229910052739 hydrogen Inorganic materials 0.000 description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 16
- 229910052799 carbon Inorganic materials 0.000 description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 14
- 238000000034 method Methods 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000571 coke Substances 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 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
- C21B13/0073—Selection or treatment of the reducing gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
-
- 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
- C21B13/029—Introducing coolant gas in the shaft furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention discloses a production device for direct reduced iron, including a reduction furnace, wherein the top surface of the furnace is provided with a feeding channel, the middle outer wall of the reduction furnace is circumferentially equidistant with several first reduction gas inlets for supplying reduced gas, the bottom outer wall of the reduction furnace is symmetrically provided with two second reduction gas inlets for supplying reduced gas; the top of the reduction furnace is equipped with a furnace top gas outlet; a cooling furnace; the cooling furnace is equipped with a nitrogen inlet in the middle, the cooling furnace is equipped with a nitrogen outlet at the top, the cooling furnace is equipped with a discharge port at the bottom; a buffer section used to connect the reduction furnace and the cooling furnace, wherein the reduction furnace, buffer section, cooling furnace are sequentially arranged from top to bottom.
Description
DESCRIPTION LU504480
PRODUCTION DEVICE FOR DIRECT REDUCED IRON
The present invention relates to the field of direct reduction metallurgy technology, in particular to a production device for direct reduced iron.
At present, the steel industry is dominated by the long process technology of blast furnace-converter, which accounts for 90% of the total technology. However, the large carbon emissions from long process technology have caused enormous pressure on carbon reduction in the steel industry. Direct reduction iron making using blast furnace gas injection or gas-based shaft furnace can achieve low-carbon or even carbon free ironmaking, and has significant advantages in reducing carbon emissions. Compared with traditional ironmaking, replacing traditional carbon reducing agents such as coal and coke with reducing hydrogen rich gases can eliminate dependence on fossil fuels and solve the problem of carbon emissions from the source.
The Chinese patent with patent number CN112176144A "A hydrogen injection ironmaking shaft furnace device and a method for achieving low energy consumption in hydrogen ironmaking" discloses a two-stage hydrogen injection ironmaking shaft furnace, which fully utilizes the waste heat of the top gas and the bottom sponge iron while completing hydrogen reduction of iron ore through means such as two-stage hydrogen injection, hydrogen circulation, top gas waste heat recovery, and bottom sponge iron waste heat recovery; although iron is directly reduced and it has certain energy-saving effects simultaneously, the safety of hydrogen circulation in this process is difficult to ensure and difficult to implement.
The Chinese patent "A Pure Hydrogen Vertical Furnace Reduction Device" witHJ504480 patent number CN216473302U discloses a hydrogen vertical furnace for direct reduction of iron, which is sequentially equipped with a heating roasting section, a temperature regulating section, an isobaric section, and a reduction cooling section. By combining them, the green pellets react with hydrogen to directly reduce iron. The design is too simple and does not provide a specific design structure.
The design process in the current patents is not perfect, and there is still a lot of room for improvement.
The purpose of the present invention is to provide a production device for direct reduced iron to solve the problems existing in the prior art.
To achieve the above objectives, the present invention provides the following solution: a production device for direct reduced iron, comprising:
A reduction furnace; the top surface of the reduction furnace is equipped with a feeding channel, and the middle outer wall of the reduction furnace is circumferentially equidistant with several first reduction gas inlets for supplying the return gas. The bottom outer wall of the reduction furnace is symmetrically equipped with two second reduction gas inlets for supplying the return gas; the top of the reduction furnace is equipped with a furnace top gas outlet;
A cooling furnace; the cooling furnace is equipped with a nitrogen inlet in the middle, and the cooling furnace is equipped with a nitrogen outlet at the top, and the cooling furnace is equipped with a discharge port at the bottom;
A buffer section used to connect the reduction furnace and the cooling furnace, wherein the reduction furnace, buffer section, and cooling furnace are sequentially arranged from top to bottom.
Preferably, the reduction furnace is divided into six sections and is sequentially divided into a head section, a pressure feeding section, a transition section, a reduction gas inlet section, a first conical reaction section, and a second conical reaction section from top to bottom; the feeding channel and the furnace top gas outlet are both arrangdd504480 on the head section, several first reduction gas inlets are arranged on the reduction gas inlet section, and two second reduction gas inlets are arranged on the second conical reaction section.
Preferably, the percentage of the height of the head section, pressure feeding section, transition section, reduction gas inlet section, first conical reaction section, and second conical reaction section to the total height of the reduction furnace is: the head section: the pressure feeding section: the transition section: the reduction gas inlet section: the first conical reaction section: the second conical reaction section: the reduction furnace = (5-7)% : (24-26)% : (6-7)% : (21-23)% : (18-20)% : (17-19)% : 100%.
Preferably, the diameter of the pressure feeding section is 1/6-1/9 of the total height of the reduction furnace, and the diameter of the reduction gas inlet section is 1/4-1/6 of the total height of the reduction furnace.
Preferably, the cooling furnace is divided into a cooling section and a discharging section from top to bottom. The nitrogen inlet and nitrogen outlet are both set on the cooling section, and the discharge port is set at the bottom of the discharging section.
The discharge port is equipped with a first sealed rotary discharger device.
Preferably, the buffer section includes a buffer silo, with a second sealed rotary discharger and a third sealed rotary discharger respectively arranged in the channels at the top and bottom of the buffer silo. The top channel of the buffer silo is communicated with the bottom of the second conical reaction section, and the bottom channel of the buffer silo is communicated with the top of the cooling section.
Preferably, the shells of the reduction furnace and the cooling furnace are both made of carbon steel or stainless steel, and the inner walls of the reduction furnace and the cooling furnace are both built with refractory bricks. Several fixed brackets are vertically spaced inside the reduction furnace and the cooling furnace to support the refractory bricks.
Preferably, the first conical reaction section, the second conical reaction section, tHéJ504480 buffer silo, the second sealed rotary discharger, and the third sealed rotary discharger are all externally equipped with water-cooled jackets.
The present invention discloses the following technical effects: the present invention proposes a production device for direct reduced iron, using coke oven gas, natural gas, or other hydrogen rich gases as feed gas. By combining the design of a reduction furnace and a cooling furnace, hydrogen rich reducing gas can be used to directly reduce iron, avoiding carbon emissions from traditional processes, thereby achieving carbon reduction at the source, effectively reducing environmental pollution and carbon emissions during the ironmaking process, and promoting the transformation of the ironmaking process from "carbon reduction" to "hydrogen reduction".
In order to provide a clearer explanation of the embodiments of the present invention or the technical solutions in the prior art, a brief introduction will be given to the accompanying drawings required in the embodiments. It is evident that the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technical personnel in the art, other accompanying drawings can be obtained based on these drawings without any creative labor:
Figure 1 is a structural schematic diagram of a production device for direct reduced iron of the present invention;
Wherein, 1. Reduction furnace; 2. Feeding channel; 3. First reduction gas inlet; 4.
Second reduction gas inlet; 5. Furnace top gas outlet; 6. Cooling furnace; 7. Nitrogen inlet; 8. Nitrogen outlet; 9. Head section; 10. Pressure feeding section; 11. Transition section; 12. Reduction gas inlet section; 13. First conical reaction section; 14. Second conical reaction section; 15. Cooling section; 16. Discharging section; 17. First sealed rotary discharger; 18. Buffer silo; 19. Second sealed rotary discharger; 20. Third sealed rotary discharger.
DESCRIPTION OF THE INVENTION LU504480
The following will provide a clear and complete description of the technical solution in the embodiments of the present invention, in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the art without creative labor fall within the scope of protection of the present invention.
In order to make the above objectives, features, and advantages of the present invention more apparent and understandable, the following will provide further detailed explanations of the present invention in conjunction with the accompanying drawings and specific implementation methods.
Referring to Figure 1, the present invention provides a production device for direct reduced iron, comprising:
Reduction furnace 1, wherein the top surface of the reduction furnace 1 is equipped with a feeding channel 2, and the middle outer wall of the reduction furnace 1 is circumferentially equidistant with several first reduction gas inlets 3 for supplying the reduced gas. On the bottom outer wall of the reduction furnace 1, two second reduction gas inlets 4 for supplying the reduced gas are symmetrically arranged; the top of the reduction furnace 1 is equipped with a furnace top gas outlet 5;
A cooling furnace 6; the cooling furnace 6 is equipped with a nitrogen inlet 7 in the middle, and the cooling furnace 6 is equipped with a nitrogen outlet 8 at the top, and the cooling furnace 6 is equipped with a discharge port at the bottom;
A buffer section used to connect the reduction furnace 1 and the cooling furnace 6, wherein the reduction furnace 1, the buffer section, and the cooling furnace 6 are sequentially arranged from top to bottom.
The present invention proposes a production device for direct reduced iron, using coke oven gas, natural gas, or other hydrogen rich gases as feed gas. Through the combination design of reduction furnace 1 and cooling furnace 6, hydrogen rich reducing gas can be used to directly reduce iron, avoiding carbon emissions from traditional processes, thereby achieving carbon reduction at the source, effectively reducing/504480 environmental pollution and carbon emissions generated during the ironmaking process, and promoting the transformation of the ironmaking process from "carbon reduction" to "hydrogen reduction".
Further optimizing the plan, the reduction furnace 1 is divided into six sections and is sequentially divided into a head section 9, a pressure feeding section 10, a transition section 11, a reduction gas inlet section 12, a first conical reaction section 13, and a second conical reaction section 14 from top to bottom; the feeding channel 2 and the furnace top gas outlet 5 are both arranged on the head section 9, several first reduction gas inlets 3 are arranged on the reduction gas inlet section 12, and two second reduction gas inlets 4 are arranged on the second conical reaction section 14.
Further optimizing the plan, the percentage of the height of the head section 9, the pressure feeding section 10, the transition section 11, the reduction gas inlet section 12, the first conical reaction section 13, and the second conical reaction section 14 to the total height of the reduction furnace 1 is: the head section 9: the pressure feeding section 10: the transition section 11: the reduction gas inlet section: the first conical reaction section 13: the second conical reaction section 14: the reduction furnace 1=(5-7)% : (24-26)% : (6-7)% : (21-23)% : (18-20)% : (17-19)% : 100%.
Further optimizing the plan, the diameter of the pressure feeding section 10 is 1/6-1/9 of the total height of the reduction furnace 1, and the diameter of the reduction gas inlet section is 1/4-1/6 of the total height of the reduction furnace 1.
Further optimizing the plan, the cooling furnace 6 is sequentially divided into a cooling section 15 and a discharging section 16 from top to bottom. The nitrogen inlet 7 and nitrogen outlet 8 are both set on the cooling section 15, and the discharge port is set at the bottom of the discharging section 16. The discharge port is equipped with a first sealed rotary discharger 17.
Cooling furnace 6 is cooled with nitrogen gas. Nitrogen gas enters the coolirig/504480 furnace 6 from the nitrogen inlet 7 on the bottom side, exchanges heat with the high-temperature furnace material, and flows out through the nitrogen outlet 8 on the upper side of the cooling furnace 6 to recover the sensible heat of the furnace material, achieving energy-saving production.
Further optimizing the plan, the buffer section includes a buffer silo 18, wherein a second sealed rotary discharger 19 and a third sealed rotary discharger 20 are respectively arranged in the channels at the top and bottom of the buffer silo 18. The top channel of the buffer silo 18 is connected to the bottom of the second conical reaction section 14, and the bottom channel of the buffer silo 18 is connected to the top of the cooling section 15.
Further optimizing the plan, the shells of the reduction furnace 1 and the cooling furnace 6 are both made of carbon steel or stainless steel, and the inner walls of the reduction furnace 1 and the cooling furnace 6 are both built with refractory bricks.
Several fixed brackets are vertically spaced inside the reduction furnace 1 and the cooling furnace 6 to support the refractory bricks.
Both reduction furnace 1 and cooling furnace 6 are pressure vessels, with the outer shell made of carbon steel or stainless steel, and the interior built with refractory bricks or other refractory materials. Fixed brackets are installed at different heights inside the furnace, and one end of the fixed bracket is fixed on the circumference of the pressure vessel, forming a complete support ring to support the refractory masonry.
Further optimizing the plan, the first conical reaction section 13, the second conical reaction section 14, the buffer silo 18, the second sealed rotary discharger 19, and the third sealed rotary discharger 20 are all equipped with water-cooled jackets externally.
The set water-cooled jacket is used to ensure the normal operation of the equipment at high temperatures.
The workflow of the present invention is as follows: the pellets enter the pressure feeding section 10 of the furnace from the feeding channel 2 at the top of the reduction furnace 1, flow downwards, and react when in contact with the reduction gas in the reduction gas inlet section. They pass through the first conical reaction section 13 and the second conical reaction section 14, enter the buffer silo 18, and after cooling in tH&J504480 cooling section 15, they are discharged from the cooling furnace 6 by the first sealed rotary discharger 17 of the discharging section 16 to obtain the finished product.
In the description of the present invention, it should be understood that the terms "longitudinal", " transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and other indications of orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, solely for the convenience of describing the present invention, Rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation of the present invention.
The above described embodiments are only a description of the preferred method of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made by ordinary technical personnel in the field to the technical solution of the present invention should fall within the scope of protection determined in the claims of the present invention.
Claims (8)
1. À production device for direct reduced iron, characterized in that it includes: a reduction furnace (1); the top surface of the reduction furnace (1) is equipped with a feeding channel (2), and the middle outer wall of the reduction furnace (1) is circumferentially equidistant with several first reduction gas inlets (3) for supplying return gas; the bottom outer wall of the reduction furnace (1) is symmetrically equipped with two second reduction gas inlets (4) for supplying return gas; the top of the reduction furnace (1) is equipped with a furnace top gas outlet (5): a cooling furnace (6); the cooling furnace (6) is provided with a nitrogen inlet (7) in the middle, and the cooling furnace (6) is provided with a nitrogen outlet (8) at the top, and the cooling furnace (6) is provided with a discharge port at the bottom; a buffer section used to connect the reduction furnace (1) and the cooling furnace (6); the reduction furnace (1), the buffer section, and the cooling furnace (6) are sequentially arranged from top to bottom.
2. The production device for direct reduced iron according to claim 1, characterized in that the reduction furnace (1) is divided into six sections and is sequentially divided into a head section (9), a pressure feeding section (10), a transition section (11), a reduction gas inlet section (12), a first conical reaction section (13), and a second conical reaction section (14) from top to bottom; the feeding channel (2) and the furnace top gas outlet (5) are both arranged on the head section (9), and several first reduction gas inlets (3) are arranged on the reduction gas inlet section (12), and two second reduction gas inlets (4) are arranged on the second conical reaction section (14).
3. The production device for direct reduced iron according to claim 2, characterized in that the percentage of the height of the head section (9), the pressure feeding section (10), the transition section (11), the reduction gas inlet section (12), the first conical reaction section (13), and the second conical reaction section (14) to the total height of the reduction furnace (1) is:
the head section (9): the pressure feeding section (10): the transition section (11)U504480 the reduction gas inlet section: the first conical reaction section (13): the second conical reaction section (14): the reduction furnace (1) = (5-7)% : (24-26)% : (6-7)% : (21-23)% : (18-20)% : (17-19)% : 100%.
4. The production device for direct reduced iron according to claim 3, characterized in that the diameter of the pressure feeding section (10) is 1/6-1/9 of the total height of the reduction furnace (1), and the diameter of the reduction gas inlet section is 1/4-1/6 of the total height of the reduction furnace (1).
5. The production device for direct reduced iron according to claim 4, characterized in that the cooling furnace (6) is sequentially divided into a cooling section (15) and a discharging section (16) from top to bottom; the nitrogen inlet (7) and nitrogen outlet (8) are both arranged on the cooling section (15), and the discharge port is arranged at the bottom of the discharging section (16), and the discharge port is equipped with a first sealed rotary discharger (17).
6. The production device for direct reduced iron according to claim 5, characterized in that the buffer section comprises a buffer silo (18), wherein a second sealed rotary discharger (19) and a third sealed rotary discharger (20) are respectively arranged in the channels at the top and bottom of the buffer silo (18), and the top channel of the buffer silo (18) is communicated with the bottom of the second conical reaction section (14); the bottom channel of the buffer silo (18) is communicated with the top of the cooling section (15).
7. The production device for direct reduced iron according to claim 6, characterizad)504480 in that the outer shell of the reduction furnace (1) and the cooling furnace (6) are both made of carbon steel or stainless steel, the inner walls of the reduction furnace (1) and the cooling furnace (6) are both built with refractory bricks, and several fixed brackets are vertically spaced inside the reduction furnace (1) and the cooling furnace (6) to support the refractory bricks.
8. The production device for direct reduced iron according to claim 7, characterized in that: the first conical reaction section (13), the second conical reaction section (14), the buffer silo (18), the second sealed rotary discharger (19), and the third sealed rotary discharger (20) are all equipped with water-cooled jackets on the outside.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310575076.6A CN116516093B (en) | 2023-05-22 | 2023-05-22 | Production device for direct reduced iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU504480B1 true LU504480B1 (en) | 2023-12-13 |
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ID=87392114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU504480A LU504480B1 (en) | 2023-05-22 | 2023-06-12 | Production device for direct reduced iron |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116516093B (en) |
| LU (1) | LU504480B1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6602317B2 (en) * | 1997-09-05 | 2003-08-05 | Midrex International, B.V. Rotterdam, Zurich Branch | Method and apparatus for controlling temperature uniformity of the burden in a direct reduction shaft furnace |
| ITMI20050731A1 (en) * | 2005-04-22 | 2006-10-23 | Danieli Off Mecc | REDUCTION OVEN |
| CN104293998A (en) * | 2014-07-18 | 2015-01-21 | 北京神雾环境能源科技集团股份有限公司 | Method and system of preparing spongy iron by using gas-based shaft furnace |
| CN205170893U (en) * | 2015-12-10 | 2016-04-20 | 爱润森德（天津）能源科技有限公司 | Directly reduced iron's production system |
| CN107974525A (en) * | 2017-12-08 | 2018-05-01 | 江苏省冶金设计院有限公司 | A kind of reduction shaft furnace |
| CN111926135B (en) * | 2020-07-14 | 2022-03-29 | 钢研晟华科技股份有限公司 | Hydrogen-based shaft furnace direct reduction system and reduction method |
| CN115449580A (en) * | 2022-08-31 | 2022-12-09 | 河北张宣高科科技有限公司 | Zero-carbon-emission direct reduction system and process completely adopting coke oven gas |
-
2023
- 2023-05-22 CN CN202310575076.6A patent/CN116516093B/en active Active
- 2023-06-12 LU LU504480A patent/LU504480B1/en active IP Right Grant
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| Publication number | Publication date |
|---|---|
| CN116516093B (en) | 2024-05-14 |
| CN116516093A (en) | 2023-08-01 |
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| FG | Patent granted |
Effective date: 20231213 |