CN113502362A - Method for improving heat of hydrogen metallurgy blast furnace - Google Patents
Method for improving heat of hydrogen metallurgy blast furnace Download PDFInfo
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- CN113502362A CN113502362A CN202110768385.6A CN202110768385A CN113502362A CN 113502362 A CN113502362 A CN 113502362A CN 202110768385 A CN202110768385 A CN 202110768385A CN 113502362 A CN113502362 A CN 113502362A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B2005/005—Selection or treatment of the reducing gases
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Abstract
The invention belongs to the technical field of hydrogen metallurgy and discloses a method for improving the heat of a hydrogen metallurgy blast furnace. Specifically, firstly, heating hydrogen to 750 ℃ in a sectional heating mode through a high-temperature multi-tube heat exchanger; hydrogen heated to 750 ℃ is fed to the cracking furnace at 2417Nm3Supplementing oxygen for combustion, thereby adjusting the hydrogen component and further increasing the hydrogen temperature to 950 ℃; hydrogen gas at 950 ℃ is sprayed into the blast furnace for metallurgy. Because hydrogen reduction is an endothermic reaction, if the hydrogen content in the blast furnace is increased, the heat in the blast furnace is insufficient, so the invention increases the hydrogen temperature to 950 ℃ for blast furnace injection, which not only makes up the blast furnace heat loss caused by hydrogen reduction, but also makes H2Has a reduction capacity higher than that of CO. In addition, the invention blows the hydrogen heated to 950 ℃ through the tuyere of the blast furnace shaft, which can improve the indirect reduction degree of the furnace burden of the shaft and reduce the direct reduction of the hearth, thereby reducing the coke consumption of the blast furnace and reducing the pollutant discharge.
Description
Technical Field
The invention belongs to the technical field of hydrogen metallurgy, and particularly belongs to a method for improving the heat of a hydrogen metallurgy blast furnace.
Background
The hydrogen metallurgy is a brand new leading-edge technology for improving the quality of base materials and reducing the emission of pollutants in the steel industry. The hydrogen metallurgy mainly uses hydrogen as a reducing agent in the reduction smelting process. Hydrogen is the most active reducing agent, and the reduction rate and the reduction efficiency can be obviously improved by improving the proportion of hydrogen in the gaseous reducing agent in the gas-solid reduction reaction process of the iron oxide. The reduction potential of hydrogen is much higher than that of carbon monoxide compared to that of carbon monoxide. When iron oxide is reduced with hydrogen, the main products are metallic iron and water vapor. The reduced tail gas has no adverse effect on the environment, and the load on the environment can be obviously reduced.
The replacement of carbon by hydrogen is an important direction of current low-carbon development and energy revolution, and is also a main way of green production in the steel industry. The development and popularization of the hydrogen metallurgy technology can fundamentally realize near zero emission of steel production, solve the problems of low performance, unstable quality and the like of high-precision steel in China, and have important practical significance for the upgrading and development of chemical and metallurgical industries in China.
However, since hydrogen reduction is an endothermic reaction, if the content of hydrogen in the blast furnace increases, heat shortage occurs in the blast furnace, and therefore, how to prevent the heat shortage of the blast furnace is a key of the hydrogen metallurgy technology.
Disclosure of Invention
The invention provides a method for improving the heat of a hydrogen metallurgy blast furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for improving the heat of a hydrogen metallurgy blast furnace, which comprises the following steps:
and 3, spraying the hydrogen obtained in the step 2 into the blast furnace from a tuyere of a hearth of the blast furnace for metallurgy.
Further, the heater in the step 1 is a high-temperature multi-tube heat exchanger, and the heat source of the heat exchanger is high-temperature flue gas generated by a flue gas generating furnace.
Furthermore, the fuel of the flue gas generating furnace is blast furnace gas, and the temperature of the high-temperature flue gas is 1050-1150 ℃.
Further, the heating mode in the step 1 is heating in a sectional mode, wherein the heating temperature is from normal temperature → 250 ℃ → 500 → 650-750 ℃; and finally heating to 650-750 ℃.
Further, the oxygen supplement amount in the step 2 is 2417Nm3H, the hydrogen temperature after cracking reaches 950 ℃.
Furthermore, a coal gas surrounding pipe is arranged on the blast furnace body in the step 3, the 9 th section of the blast furnace body is provided with 44 cooling walls, a hydrogen gas blowing opening is arranged between the gap of every two cooling walls, 8 blowing openings are arranged, and the blast furnace cooling walls are inserted into a spray gun, the inner diameter is 36mm, and the outer diameter is 80 mm.
The temperature is above 850 ℃, and the reduction reaction of the iron oxide is carried out step by step according to the steps of Fe2O3 → Fe3O4 → FeO → Fe. According to the requirements of iron oxide reduction on atmosphere:
at the temperature below 570 ℃, FeO is directly reduced into metallic iron without Fe3O 4; above 570 ℃, high valence iron passes through an FeO region when being reduced.
The temperature is more than 570 ℃: the first stage of reduction, Fe2O3 → Fe3O4, has extremely low requirements on atmosphere and can be regarded as irreversible reaction;
the second stage of reduction, Fe3O4 → FeO, the reduction reactions are all endothermic;
the third stage of reduction, FeO → Fe, is an exothermic reaction.
Below 810 ℃, the H2 reduction curve is positioned at the upper part of CO, and the CO reduction capacity in the interval is higher than that in H2; and above 810 ℃ the other way round. The invention therefore determines a blowing temperature of 950 ℃.
Compared with the prior art, the invention has the following advantages:
1. because hydrogen reduction is an endothermic reaction, if the hydrogen content in the blast furnace is increased, the heat in the blast furnace is insufficient, so the invention increases the hydrogen temperature to 950 ℃ for blast furnace injection, which not only makes up the blast furnace heat loss caused by hydrogen reduction, but also makes H2Has a reduction capacity higher than that of CO.
2. The invention blows the hydrogen heated to 950 ℃ through the tuyere of the blast furnace shaft, can improve the indirect reduction degree of the furnace burden of the shaft and reduce the direct reduction of the hearth, thereby reducing the coke consumption of the blast furnace and reducing the pollutant discharge.
Drawings
FIG. 1 is a flow chart of the method of the present invention. Wherein, the device comprises a 1-flue gas producer, a 2-multi-tube heat exchanger, a 3-cracking furnace and a 4-blast furnace.
Detailed Description
The technical solution in the embodiments of the present invention will be specifically and specifically described below with reference to the embodiments of the present invention and the accompanying drawings. It should be noted that variations and modifications can be made by those skilled in the art without departing from the principle of the present invention, and these should also be construed as falling within the scope of the present invention.
Example 1
Heating the hydrogen byproduct of the toughening co-production of ethylene glycol to 750 ℃ in a segmented heating mode (normal temperature → 250 ℃ → 500 ℃ → 750 ℃) by a high-temperature multi-tube heat exchanger (PSD-lghrq); the heat source of the high-temperature multi-tube heat exchanger is 1150 ℃ high-temperature flue gas generated by a flue gas generating furnace (YQL-21.0);
hydrogen heated to 750 ℃ was fed to a cracker (dIICT6) at 2417Nm3Supplementing oxygen for combustion, thereby adjusting the hydrogen component and further increasing the hydrogen temperature to 950 ℃;
injecting 950 ℃ hydrogen into the blast furnace from a tuyere of a blast furnace hearth to make iron. The blast furnace shaft is provided with a coal gas surrounding pipe, the 9 th section of the blast furnace shaft is provided with 44 cooling walls, a hydrogen gas injection opening is arranged between the gaps of every two cooling walls, 8 injection air openings are arranged, the blast furnace cooling walls are inserted into a spray gun, the inner diameter is 36mm, and the outer diameter is 80 mm.
Example 2
Heating the byproduct hydrogen of the toughening co-production of glycol to 650 ℃ in a sectional heating mode (normal temperature → 250 ℃ → 500 → 650 ℃) by a high-temperature multi-tube heat exchanger; the heat source of the high-temperature multi-tube heat exchanger is 1050 ℃ high-temperature flue gas generated by the flue gas producer;
hydrogen heated to 700 ℃ is fed to the cracking furnace at 2417Nm3Supplementing oxygen for combustion, thereby adjusting the hydrogen component and further increasing the hydrogen temperature to 950 ℃;
injecting 950 ℃ hydrogen into the blast furnace from a tuyere of a blast furnace hearth to make iron. The blast furnace shaft is provided with a coal gas surrounding pipe, the 9 th section of the blast furnace shaft is provided with 44 cooling walls, a hydrogen gas injection opening is arranged between the gaps of every two cooling walls, 8 injection air openings are arranged, the blast furnace cooling walls are inserted into a spray gun, the inner diameter is 36mm, and the outer diameter is 80 mm.
Example 3
Heating the byproduct hydrogen of the toughening co-production of glycol to 720 ℃ in a sectional heating manner (normal temperature → 250 ℃ → 500 → 720 ℃) by a high-temperature multi-tube heat exchanger; the heat source of the high-temperature multi-tube heat exchanger is high-temperature flue gas at 1100 ℃ generated by a flue gas producer;
hydrogen heated to 720 ℃ is fed to the cracking furnace at 2417Nm3Supplementing oxygen for combustion, thereby adjusting the hydrogen component and further increasing the hydrogen temperature to 950 ℃;
injecting 950 ℃ hydrogen into the blast furnace from a tuyere of a blast furnace hearth to make iron. The blast furnace shaft is provided with a coal gas surrounding pipe, the 9 th section of the blast furnace shaft is provided with 44 cooling walls, a hydrogen gas injection opening is arranged between the gaps of every two cooling walls, 8 injection air openings are arranged, the blast furnace cooling walls are inserted into a spray gun, the inner diameter is 36mm, and the outer diameter is 80 mm.
Claims (6)
1. A method for increasing the heat of a hydrogen metallurgy blast furnace is characterized by comprising the following steps:
step 1, heating hydrogen through a heater;
step 2, the heated hydrogen enters a cracking furnace, and the hydrogen components are adjusted through secondary oxygen supplement combustion to further increase the hydrogen temperature;
and 3, spraying the hydrogen obtained in the step 2 into the blast furnace from a tuyere of a hearth of the blast furnace for metallurgy.
2. The method for increasing the heat of a hydrometallurgical blast furnace according to claim 1, characterized in that: the heater in the step 1 is a high-temperature multi-tube heat exchanger, and the heat source of the heat exchanger is high-temperature flue gas generated by a flue gas generating furnace.
3. The method for increasing the heat of a hydrometallurgical blast furnace according to claim 1, characterized in that: the heating mode in the step 1 is heating in a sectional mode, wherein the heating temperature is from normal temperature → 250 ℃ → 500 → 650-750 ℃; and finally heating to 650-750 ℃.
4. The method for increasing the heat of a hydrometallurgical blast furnace according to claim 2, characterized in that: the fuel of the flue gas generating furnace is blast furnace gas, and the temperature of the high-temperature flue gas is 1050-1150 ℃.
5. The method for increasing the heat of a hydrometallurgical blast furnace according to claim 1, characterized in that: the oxygen supplement amount in the step 2 is 2417Nm3H, the hydrogen temperature after cracking reaches 950 ℃.
6. The method for increasing the heat of a hydrometallurgical blast furnace according to claim 1, characterized in that: and 3, arranging a coal gas bustle pipe on the blast furnace body, wherein the 9 th section of the blast furnace body is provided with 44 cooling walls, a hydrogen gas injection opening is arranged between the gaps of every two cooling walls, 8 injection air openings are arranged, and the blast furnace cooling walls are inserted into spray guns, and have the inner diameter of 36mm and the outer diameter of 80 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110768385.6A CN113502362A (en) | 2021-07-07 | 2021-07-07 | Method for improving heat of hydrogen metallurgy blast furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110768385.6A CN113502362A (en) | 2021-07-07 | 2021-07-07 | Method for improving heat of hydrogen metallurgy blast furnace |
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| CN113502362A true CN113502362A (en) | 2021-10-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114438270A (en) * | 2022-01-25 | 2022-05-06 | 河钢集团有限公司 | All-oxygen, hydrogen-rich, low-carbon reduction melting ironmaking system and ironmaking method |
| CN115058548A (en) * | 2022-05-31 | 2022-09-16 | 昌黎县兴国精密机件有限公司 | Supersonic hydrogen injection system based on Raoult nozzle and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1407961A (en) * | 1973-01-24 | 1975-10-01 | Centre Rech Metallurgique | Production of hot reducing gases |
| CN1487097A (en) * | 2003-06-23 | 2004-04-07 | 安徽工业大学 | Blast furnace iron-making technique with hydrogen-rich fuel gas, pure oxygen and thus high efficiency and low CO2 exhaust |
| CN108699612A (en) * | 2016-02-05 | 2018-10-23 | 新日铁住金株式会社 | Method for supplying hydrogen-containing reducing gas to blast furnace shaft |
| CN112322814A (en) * | 2020-12-01 | 2021-02-05 | 上大新材料(泰州)研究院有限公司 | System and method for blowing hydrogen-containing gas into blast furnace |
-
2021
- 2021-07-07 CN CN202110768385.6A patent/CN113502362A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1407961A (en) * | 1973-01-24 | 1975-10-01 | Centre Rech Metallurgique | Production of hot reducing gases |
| CN1487097A (en) * | 2003-06-23 | 2004-04-07 | 安徽工业大学 | Blast furnace iron-making technique with hydrogen-rich fuel gas, pure oxygen and thus high efficiency and low CO2 exhaust |
| CN108699612A (en) * | 2016-02-05 | 2018-10-23 | 新日铁住金株式会社 | Method for supplying hydrogen-containing reducing gas to blast furnace shaft |
| CN112322814A (en) * | 2020-12-01 | 2021-02-05 | 上大新材料(泰州)研究院有限公司 | System and method for blowing hydrogen-containing gas into blast furnace |
Non-Patent Citations (1)
| Title |
|---|
| 师学峰等: "焦炉煤气自重整成分变化规律热力学计算", 《钢铁研究学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114438270A (en) * | 2022-01-25 | 2022-05-06 | 河钢集团有限公司 | All-oxygen, hydrogen-rich, low-carbon reduction melting ironmaking system and ironmaking method |
| CN114438270B (en) * | 2022-01-25 | 2023-01-31 | 河钢集团有限公司 | Full-oxygen hydrogen-rich low-carbon reduction melting iron-making system and iron-making method |
| CN115058548A (en) * | 2022-05-31 | 2022-09-16 | 昌黎县兴国精密机件有限公司 | Supersonic hydrogen injection system based on Raoult nozzle and control method |
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Application publication date: 20211015 |