CN108977601B - Method for communicating blast furnace tuyere and iron notch - Google Patents
Method for communicating blast furnace tuyere and iron notch Download PDFInfo
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- CN108977601B CN108977601B CN201710412971.0A CN201710412971A CN108977601B CN 108977601 B CN108977601 B CN 108977601B CN 201710412971 A CN201710412971 A CN 201710412971A CN 108977601 B CN108977601 B CN 108977601B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a method for communicating a blast furnace tuyere and an iron notch, which mainly solves the technical problems of low efficiency and high cost of the method for communicating the blast furnace tuyere and the iron notch in the prior art. The technical scheme of the invention is as follows: a method for communicating a blast furnace tuyere and a taphole, comprising: 1) drilling through a mud bag at the iron notch of the blast furnace to ensure that the iron notch pore passage of the iron notch of the blast furnace is smooth; 2) removing the middle sleeve and the small sleeve of the blast furnace tuyere, and opening coke at the front end of the blast furnace tuyere to form a spittoon; 3) sequentially charging aluminum ingots and coke into a spittoon at the front end of an air port of the blast furnace; 4) oxygen burning operation is carried out on the spittoon at the front end of the blast furnace tuyere; 5) when aluminum liquid seeps out from the taphole hole channel of the blast furnace taphole, the oxygen burning operation is stopped. By adopting the method, when the freezing of the blast furnace hearth is treated, the method can quickly run through the blast furnace tuyere and the blast furnace iron notch channel, shorten the oxygen burning time in front of the blast furnace and greatly shorten the accident treatment time.
Description
Technical Field
The invention relates to a method for penetrating a blast furnace tuyere and an iron notch, in particular to a method for penetrating the blast furnace tuyere and the iron notch after a blast furnace hearth is frozen, so as to realize tapping of the blast furnace iron notch, and belongs to the technical field of iron making of iron and steel metallurgy blast furnaces.
Background
After the blast furnace hearth is frozen, the fluidity of the iron slag above the iron notch of the hearth is insufficient, even the iron slag is condensed, and the iron slag can not automatically flow out of the iron notch area, so that the normal smelting process is interrupted. When the iron notch is confirmed to be incapable of discharging the iron slag, the treatment measures are as follows: tapping iron through a slag hole; tapping iron through a tuyere; and (4) burning through a channel between the iron notch and the tuyere above the iron notch, and tapping by using the iron notch.
The chinese patent No. CN204022853U discloses a temporary iron notch freezing device for a furnace hearth, which mainly utilizes the tapping of a blast furnace slag notch to discharge cold iron slag, the furnace hearth gradually stores heat, and when the fluidity of the iron slag between a tuyere and an iron notch is good and the iron slag can automatically flow out from the iron notch, the iron notch is used for tapping, and the furnace condition is gradually recovered. The method has the following problems: at present, no slag hole is arranged in large and medium-sized blast furnaces, and the slag hole cannot be set as a temporary iron hole.
Chinese patent application publication No. CN105671230A discloses a device for burning iron-making blast furnace tuyere and taphole, which is used for tapping iron by burning a channel between the taphole and the tuyere above the taphole, and has the following problems: for 3000m3In the large blast furnace, the distance between the central line of the taphole and the central line of the tuyere exceeds 4m, the working space of the tuyere platform is limited, the field operation environment is poor, such as high temperature, coal gas, dust and the like, a large amount of time is spent on burning through the channel, and the accident recovery time of the blast furnace is prolonged; when oxygen burning operation penetrating through the iron notch and the tuyere channel is carried out, the oxygen burning time is longer and the day and night do not stop when the oxygen is burnt from the iron notch to the tuyere or the oxygen lance burying operation of the iron notch is carried outThe iron notch pore passage is easy to be burned to be large, even the combined carbon brick in the iron notch area is endangered, so that the iron notch pore passage is enlarged in the subsequent production process, coke is easily sprayed to the iron notch to cause burning loss of surrounding cables and energy medium pipelines; the device is clumsy, and when operating personnel implemented, physical consumption was huge, easily caused salvage and suspend, prolonged accident handling time.
Disclosure of Invention
The invention aims to provide a method for communicating a blast furnace tuyere and an iron notch, which mainly solves the technical problems that the method for communicating the blast furnace tuyere and the iron notch in the prior art is low in efficiency and difficult to judge the communication between the blast furnace tuyere and the iron notch, can quickly realize the communication between the blast furnace tuyere and the iron notch when a blast furnace cylinder is cold and frozen, recovers the tapping of the blast furnace iron notch and reduces the influence on the normal production of the blast furnace.
The technical idea of the invention is as follows: when the blast furnace hearth is cool and frozen, the tuyere middle sleeve is removed, and then new coke and aluminum ingots are loaded at the front end of the tuyere to perform oxygen burning operation. A large amount of thermite reaction oxidants such as ferrous oxide, ferric oxide, manganese dioxide and the like exist in frozen slag iron, and after the aluminum liquid contacts the frozen slag iron, thermite reaction is carried out under the catalysis of pure oxygen and high temperature: 2Al +3FeO ═ Al2O3+3Fe；2Al+Fe2O3＝Al2O3+2Fe；4Al+3MnO2＝2Al2O3+3 Mn; the aluminothermic reaction can release higher temperature to generate enough heat, so that the temperature of the spittoon at the front end of the tuyere is greatly increased, the iron slag is in a molten state, and the continuity of oxygen burning operation is ensured; when part of molten liquid aluminum which does not participate in the thermit reaction carries heat to infiltrate downwards, and flows out of the furnace when encountering the iron notch pore passage, the iron notch and the tuyere can be judged to be communicated. The molten aluminum simulates the movement path of molten iron substantially, and the appearance of white molten aluminum at the taphole indicates that the tuyere and the taphole are communicated visually.
The technical scheme adopted by the invention is as follows: a method for penetrating a blast furnace tuyere and a taphole comprises the following steps:
1) drilling through a mud bag at the iron notch of the blast furnace to ensure that the iron notch pore passage of the iron notch of the blast furnace is smooth;
2) removing the middle sleeve and the small sleeve of the blast furnace tuyere, and opening coke at the front end of the blast furnace tuyere to form a spittoon;
3) sequentially filling an aluminum ingot and coke into a spittoon at the front end of a blast furnace tuyere, firstly spreading the aluminum ingot on the iron slag, then spreading the coke on the aluminum ingot, and forming an aluminum ingot layer and a coke layer above the iron slag;
4) oxygen burning operation is carried out on a spittoon at the front end of a blast furnace tuyere, and the front end of an oxygen pipe for oxygen burning is inserted between an aluminum ingot layer and a coke layer;
5) observing an iron notch pore passage of a blast furnace iron notch right below the oxygen burning operation, and stopping the oxygen burning operation at a spittoon at the front end of the blast furnace air notch when aluminum liquid seeps out of the iron notch pore passage of the blast furnace iron notch to complete the communication between the blast furnace air notch and the blast furnace iron notch; and when no aluminum liquid seeps out from the iron notch pore passage of the blast furnace iron notch, repeating the steps 3) and 4), and stopping oxygen burning operation at the spittoon at the front end of the blast furnace air notch until aluminum liquid seeps out from the iron notch pore passage of the blast furnace iron notch, so as to complete the communication between the blast furnace air notch and the blast furnace iron notch.
Further, in the step 3), the volume ratio of the aluminum ingot to the coke is 1:100-3:100, so that the effect is good;
further, in the step 3), the aluminum ingot is a cube with the side length of 20-50 mm; the coke is dry quenched, the particle size of the coke is 25mm-50mm, and the effect is good.
Further, in the step 4), the oxygen pipe for oxygen burning is a high temperature resistant stainless steel pipe, and the distance from the front end to the inner side of the blast furnace wall is 300-500mm, so as to protect the blast furnace wall.
The method of the invention utilizes thermit reaction to accelerate the cold iron slag in the melting furnace hearth, accelerate the tuyere cleaning process, avoid oxygen combustion interruption, and can continuously obtain heat, finally the molten iron slag and the molten aluminum can freely flow out from the taphole, and the blast furnace tuyere and the taphole are communicated.
Compared with the prior art, the invention has the following positive effects: when the method is used for treating blast furnace big coolness and furnace hearth freezing, the method can quickly penetrate through a blast furnace tuyere and a taphole channel, and can visually judge whether the tuyere and the taphole are penetrated through by outflow of molten iron at the taphole. The method shortens the oxygen burning time, reduces the labor intensity of operation, and greatly shortens the processing process of the accidents of big cooling of the blast furnace and freezing of the furnace hearth.
Drawings
FIG. 1 is a schematic view of the tuyere and taphole area structure of a blast furnace
The notation in the figure is: 1-oxygen tube, 2-coke, 3-aluminum ingot, 4-aluminum liquid, 5-taphole pore canal, 6-mud bag, 7-blast furnace tuyere and 8-blast furnace taphole.
Detailed Description
The present invention will be further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative and not limitative of the scope of the present invention.
A method for penetrating a blast furnace tuyere and a taphole comprises the following steps:
1) drilling through a mud bag 6 at a blast furnace taphole 8 by using a blast furnace taphole tapping machine to ensure that a taphole pore passage 5 of the blast furnace taphole 8 is smooth;
2) the middle sleeve and the small sleeve of the blast furnace tuyere 7 are dismounted, and the coke at the front end of the blast furnace tuyere 7 is raked open to form a spittoon;
3) sequentially filling an aluminum ingot 3 and coke 2 into a spittoon at the front end of a blast furnace tuyere 7, firstly flatly laying the aluminum ingot 3 on slag iron, then flatly laying the coke 2 on the aluminum ingot 3, forming an aluminum ingot layer and a coke layer above the slag iron, and filling the aluminum ingot 3 and the coke 2 in a volume ratio of 1: 50; the aluminum ingot is a cube with the side length of 50mm, coke is dry-quenched, and the particle size of the coke is 50 mm;
4) oxygen burning is carried out on a spittoon at the front end of a blast furnace tuyere 7, the front end of a stainless steel oxygen pipe 1 for oxygen burning is inserted between an aluminum ingot layer 3 and a coke layer 2, and the distance from the front end of the stainless steel oxygen pipe 1 for oxygen burning to the inner side of a blast furnace wall is 500 mm;
5) observing the taphole duct 5 of the blast furnace taphole 8, and stopping the oxygen burning operation at the spittoon at the front end of the blast furnace taphole 7 when the taphole duct 5 of the blast furnace taphole 8 has the aluminum liquid 4 exuded, thereby completing the communication between the blast furnace taphole 7 and the blast furnace taphole 8.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. A method for communicating a blast furnace tuyere and a taphole is characterized by comprising the following steps:
1) drilling through a mud bag at the iron notch of the blast furnace to ensure that the iron notch pore passage of the iron notch of the blast furnace is smooth;
2) removing the middle sleeve and the small sleeve of the blast furnace tuyere, and opening coke at the front end of the blast furnace tuyere to form a spittoon;
3) sequentially filling an aluminum ingot and coke into a spittoon at the front end of a blast furnace tuyere, firstly spreading the aluminum ingot on the iron slag, then spreading the coke on the aluminum ingot, and forming an aluminum ingot layer and a coke layer above the iron slag;
4) oxygen burning operation is carried out on a spittoon at the front end of a blast furnace tuyere, and the front end of an oxygen pipe for oxygen burning is inserted between an aluminum ingot layer and a coke layer;
5) observing an iron notch pore passage of a blast furnace iron notch right below the oxygen burning operation, and stopping the oxygen burning operation at a spittoon at the front end of the blast furnace air notch when aluminum liquid seeps out of the iron notch pore passage of the blast furnace iron notch to complete the communication between the blast furnace air notch and the blast furnace iron notch; and when no aluminum liquid seeps out from the iron notch pore passage of the blast furnace iron notch, repeating the steps 3) and 4), and stopping oxygen burning operation at the spittoon at the front end of the blast furnace air notch until aluminum liquid seeps out from the iron notch pore passage of the blast furnace iron notch, so as to complete the communication between the blast furnace air notch and the blast furnace iron notch.
2. The method of claim 1, wherein the ratio of the aluminum ingot to the coke charged into the spittoon located at the front end of the tuyere of the blast furnace is 1:100 to 3:100 by volume in step 3).
3. The method of claim 1, wherein in the step 3), the aluminum ingot is a cube having a side length of 20-50mm, the coke is dry-quenched, and the particle size of the coke is 25-50 mm.
4. The method as claimed in claim 1, wherein the distance between the front end of the oxygen tube for burning oxygen and the inner side of the blast furnace wall in the step 4) is 300-500 mm.
5. The method according to claim 1, wherein in the step 4), the oxygen pipe for oxygen combustion is made of a high temperature resistant stainless steel pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710412971.0A CN108977601B (en) | 2017-06-05 | 2017-06-05 | Method for communicating blast furnace tuyere and iron notch |
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| CN201710412971.0A CN108977601B (en) | 2017-06-05 | 2017-06-05 | Method for communicating blast furnace tuyere and iron notch |
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| CN108977601A CN108977601A (en) | 2018-12-11 |
| CN108977601B true CN108977601B (en) | 2020-06-16 |
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| CN110806113B (en) * | 2019-11-25 | 2020-08-25 | 北京科技大学 | Method and device for reducing energy consumption by introducing gas into submerged arc furnace |
| CN115198044B (en) * | 2022-06-30 | 2023-09-22 | 南京钢铁股份有限公司 | Method for rapidly treating freezing of blast furnace hearth |
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| CN105368995B (en) * | 2015-10-10 | 2018-03-06 | 首钢水城钢铁（集团）有限责任公司 | A kind of furnace charge method of replacing under blast furnace accident |
| CN107254560A (en) * | 2017-05-12 | 2017-10-17 | 江苏金基特钢有限公司 | The processing blast furnace crucibe method freezed and the iron mouthful oxygen rifle used |
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