WO2023233957A1 - Procédé de fonctionnement de haut-fourneau et haut-fourneau - Google Patents
Procédé de fonctionnement de haut-fourneau et haut-fourneau Download PDFInfo
- Publication number
- WO2023233957A1 WO2023233957A1 PCT/JP2023/017685 JP2023017685W WO2023233957A1 WO 2023233957 A1 WO2023233957 A1 WO 2023233957A1 JP 2023017685 W JP2023017685 W JP 2023017685W WO 2023233957 A1 WO2023233957 A1 WO 2023233957A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blast furnace
- furnace
- coke
- blast
- combustion
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000571 coke Substances 0.000 claims abstract description 53
- 239000007789 gas Substances 0.000 claims abstract description 52
- 238000002485 combustion reaction Methods 0.000 claims abstract description 35
- 239000011261 inert gas Substances 0.000 claims abstract description 22
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 claims abstract description 6
- 238000011017 operating method Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 13
- 239000001301 oxygen Substances 0.000 abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 abstract description 13
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 230000002542 deteriorative effect Effects 0.000 abstract description 2
- 238000005422 blasting Methods 0.000 abstract 7
- 239000000155 melt Substances 0.000 abstract 1
- 238000010079 rubber tapping Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 9
- 239000002893 slag Substances 0.000 description 7
- 239000012768 molten material Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 240000001549 Ipomoea eriocarpa Species 0.000 description 1
- 235000005146 Ipomoea eriocarpa Nutrition 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
Definitions
- the present invention relates to a blast furnace operating method for stopping the operation, resting the blast furnace, and then restarting the blast furnace, and a blast furnace used in the blast furnace operating method.
- blast furnace operations have not stopped since firing, except for short-term shutdowns for periodic equipment repairs, and although operations have been adjusted such as reducing production, it has been assumed that operations will continue. ing. This is because the cost of restarting operations due to a shutdown is enormous and is not economically rational, and once operations are stopped, it takes about half a year to restart, so there is no upward elasticity with respect to production volume. It will be done.
- blast furnace operations are now required to be flexible to large fluctuations in production, and the importance of banking to shut down operations while it is possible to restart them is increasing.
- Patent Document 1 in order to prevent troubles in repair work, the incombustible materials introduced into the furnace have a low melting point composition, thereby deteriorating the discharge performance when restarting the furnace. He was trying to deter him.
- Patent Document 2 it was found that not only the remaining coke is reduced in diameter due to combustion consumption, but also that the pig iron, slag, etc. attached to the coke are remelted when restarting operations, leading to an increase in the amount of molten material. After the coke was intentionally burnt out using a burner, new coke was charged to prevent the amount of molten material from increasing when restarting the plant.
- Patent Document 1 in addition to the in-furnace slag that is generated upon resumption of operation, low-melting point incombustibles are injected from outside the system, which still poses a problem in that it leads to an increase in the amount of slag that must be discharged. was left. Additionally, Patent Document 2 is more advanced in that it suppresses the increase in the amount of molten material compared to the conventional technology, but it does not prevent diameter reduction itself due to combustion of newly charged coke. However, the problem was that the longer the banking period, the smaller the diameter due to the combustion consumption of coke and the accompanying deterioration in emissions.
- the purpose of the present invention is to suppress the reduction in diameter due to the combustion consumption of coke, which could not be achieved in the previous patent, and to prevent the deterioration of the discharge performance of the molten material, thereby enabling smooth restart of the blast furnace.
- the aim is to propose operating methods and blast furnaces.
- the blast furnace operating method of the present invention was developed to solve the above-mentioned problems, and is a blast furnace operating method for stopping the operation, taking a break from the blast furnace, and then restarting the blast furnace.
- a combustion process involves blowing oxygen-containing gas through a burner inserted into the taphole after the wind has finished, and burning the coke remaining in the furnace to reduce the volume of the remaining material in the furnace, and adding new coke to the volume reduction area.
- the method for operating a blast furnace the method includes a charging step in which air is introduced into the furnace, and a blowing step in which air is restarted from the tuyeres. This is a blast furnace operating method that includes an introduction step.
- the blast furnace operating method configured as described above, (1) further comprising a determination step of determining whether or not combustion of coke in the blast furnace continues after the introduction step; (2) In the determination step, the concentration of gas in the blast furnace is analyzed, and if the concentration of CO gas is equal to or higher than a threshold value, determining that the combustion of coke in the blast furnace continues; (3) further comprising an additional step of charging additional coke up to the upper part of the tuyere when it is determined in the determination step that the combustion of coke in the blast furnace continues; (4) In the introduction step, the amount of inert gas introduced into the blast furnace is in the range of 7% to 13% of the blast furnace volume per hour; (5) In the introduction step, the inert gas is introduced into the blast furnace through an inlet formed above the tuyere of the blast furnace; is considered to be a more preferable solution.
- the blast furnace of the present invention is a blast furnace that implements the above-described blast furnace operating method, and is a blast furnace in which an inlet for introducing inert gas is formed above the tuyere.
- the blast furnace operating method and blast furnace of the present invention by introducing an inert gas into the blast furnace, it is possible to prevent diameter reduction due to combustion consumption of coke in the blast furnace. Thereby, the blast furnace can be restarted smoothly by preventing deterioration in the discharge performance of the molten material. Furthermore, since the present invention does not require maintaining the furnace internal pressure at a positive pressure, there is no risk of the furnace gas leaking outside the furnace due to the introduction of inert gas, and various operations around the blast furnace can be carried out in parallel. It is possible to do so.
- FIG. 2 is a schematic cross-sectional view of the lower part of the blast furnace, showing a state in which a burner is inserted from the tap hole. It is a schematic diagram showing an example of a burner. FIG. 2 is a schematic cross-sectional view showing a state in which residual coke is combusted using a burner to reduce the volume of residual matter in the furnace.
- BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram for demonstrating one Embodiment of the furnace body of the blast furnace which implements the blast furnace operation method based on this invention. It is a graph showing the relationship between the amount of N 2 gas introduced into the furnace and the CO gas concentration in the furnace.
- FIG. 1 is a schematic cross-sectional view showing a part of the cross-section of the furnace body of a blast furnace.
- the blast furnace when the blast furnace is to be ventilated for a long period of time, the height of the surface of the raw material packed layer directly above the tuyere of the blast furnace is reduced from the upper end of the morning glory part of the blast furnace.
- FIG. 2 is a schematic cross-sectional view of the lower part of the blast furnace, showing a state in which the burner is inserted from the tap hole.
- the taphole is closed with a material called mud material when the blast furnace is not in operation. Open.
- a known taphole opening machine can be used to open the taphole. After the taphole opens, a burner is inserted into the lower part of the blast furnace through the taphole.
- FIGS. 3(a) and 3(b) are schematic diagrams each showing an example of a burner.
- the burner has a double tube structure including an inner tube and an outer tube through which gas flows, and a cap that covers the ends of the inner tube and the outer tube. , and a thermocouple provided outside the outer tube to measure the temperature of the burner.
- the cap is present as shown in FIG. 3(a)
- the gas blown from the gas inlet of the inner tube is discharged from the gas outlet of the outer tube without leaking to the outside.
- the cap is not present as shown in FIG. 3(b)
- the gas blown from the gas inlet of the inner tube is supplied into the furnace. Therefore, since the burner has a function of cooling the burner by flowing gas from the inner tube to the outer tube with the cap present, the burner can be stably inserted into the furnace.
- FIG. 4 is a schematic cross-sectional view showing a state in which the remaining coke is burned using a burner to reduce the volume of the remaining material in the furnace.
- FIG. 4 when coke disappears through combustion, more coke rolls into the space where the combustion disappeared according to the angle of repose, and as the coke sequentially burns and disappears, the volume of the remaining material in the furnace decreases. .
- a feature of the blast furnace operating method and blast furnace of the present invention is that it includes an introduction step of introducing an inert gas into the blast furnace after the above-mentioned air suspension and before the air blowing step.
- “after the wind rest and before the blowing process” means after the wind rest and (1) before the combustion process, (2) after the combustion process and before the charging process. (3) After the charging process and before the blowing process.
- (2) is preferred.
- the process is delayed because coke combustion may be inhibited.
- the temperature inside the furnace increases in step (2), which causes some of the unused coke charged in the charging process to react, which reduces the effect of the present invention. Decrease.
- inert gas is introduced into the blast furnace to suppress contact between the coke charged in the volume reduction area between the tuyere and the taphole and air. , inhibiting coke combustion.
- various inert gases such as argon and nitrogen can be used as the inert gas, but nitrogen (N 2 ) is optimal from the viewpoint of cost.
- FIG. 5 is a schematic diagram for explaining one embodiment of a furnace body of a blast furnace that implements the blast furnace operating method according to the present invention.
- the blast furnace is provided with piping serving as an inlet above the tuyeres, and inert gas is introduced into the blast furnace through this inlet.
- the inlet is provided directly above the tuyere, but it is located near the top of the blast furnace (for example, at a position approximately 5 m below the top of the blast furnace when the height of the blast furnace is 100 m).
- An inlet may be provided in the.
- inert gas By providing the introduction port above the tuyere, it is possible to prevent the introduction of the inert gas from being hindered by the coke charged in the volume reduction region between the tuyere and the taphole.
- inert gas By providing an inlet for introducing inert gas separately from other openings such as the raw material charging port, tuyere, and taphole, it is possible to , inert gas can be introduced without interfering with other operations or equipment.
- the amount of inert gas introduced into the blast furnace is determined by the volume of the blast furnace. Specifically, it is preferable to set the amount in a range of 7% or more and 13% or less per hour based on the volume of the blast furnace. This range is preferable because if the amount introduced is less than 7%, the amount is too small and it is difficult to suppress coke combustion, and even if the amount introduced is greater than 13%, the combustion suppression effect will not change. be.
- a determination step of determining whether or not combustion of coke in the blast furnace continues after the introduction step of introducing an inert gas into the blast furnace it is preferable to add a determination step of determining whether or not combustion of coke in the blast furnace continues after the introduction step of introducing an inert gas into the blast furnace.
- a gas analyzer is installed in a recovery pipe (not shown) that collects gas discharged from the furnace top, and this gas analyzer measures the gas concentration inside the furnace (gas concentration discharged from the furnace top). ) to analyze. If the concentration of CO gas is high (above the threshold value), it is determined that coke combustion continues, and if the concentration of CO gas is low (below the threshold value), it is determined that coke combustion continues. It is determined that the The CO gas concentration serving as the threshold value is, for example, 1%.
- FIG. 6 is a graph showing the relationship between the amount of N 2 gas introduced into the furnace and the CO gas concentration within the furnace.
- plots are omitted when the amount of N2 gas introduced is less than 7%, but when the amount of N2 gas introduced is less than 7%, the CO gas concentration is orders of magnitude higher than when it is 7% or more ( For example, 8% or more).
- the CO gas concentration was approximately 0.8% when the amount of N 2 gas introduced was 7%, and a sufficient decrease in the CO gas concentration was confirmed.
- the amount of N2 gas introduced was increased to 10%, resulting in a 25% increase in the amount of N2 gas introduced compared to the case where the amount of N2 gas introduced was 8%.
- the CO gas concentration decreased by 80% to around 0.1%, and the combustion consumption of coke could be sufficiently suppressed.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
L'invention propose un procédé de fonctionnement de haut-fourneau et un haut-fourneau avec lesquels il est possible de remettre en fonctionnement en douceur un haut-fourneau en empêchant le coke de diminuer en diamètre en raison d'une combustion et d'une consommation et d'empêcher la masse en fusion de se détériorer en termes de capacité de sortie. Le procédé de fonctionnement de haut-fourneau est destiné à suspendre un fonctionnement d'un haut-fourneau pour arrêter le soufflage et par la suite redémarrer le soufflage, et comprend une étape de combustion dans laquelle, après l'arrêt du soufflage, un gaz contenant de l'oxygène est soufflé dans le four avec un brûleur inséré dans le trou de coulée pour brûler le coke subsistant dans le four et réduire le volume de résidus dans le four, une étape de charge dans laquelle du coke est nouvellement chargé dans la région de réduction de volume, et une étape de soufflage dans laquelle un soufflage par les tuyères est redémarré. Le procédé de fonctionnement de haut-fourneau comprend en outre une étape d'introduction dans laquelle un gaz inerte est introduit dans le four pendant la période allant d'après l'arrêt du soufflage jusqu'à avant l'étape de soufflage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2023549669A JPWO2023233957A1 (fr) | 2022-05-31 | 2023-05-11 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022-088244 | 2022-05-31 | ||
| JP2022088244 | 2022-05-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023233957A1 true WO2023233957A1 (fr) | 2023-12-07 |
Family
ID=89026357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2023/017685 WO2023233957A1 (fr) | 2022-05-31 | 2023-05-11 | Procédé de fonctionnement de haut-fourneau et haut-fourneau |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPWO2023233957A1 (fr) |
| WO (1) | WO2023233957A1 (fr) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5271307A (en) * | 1975-12-11 | 1977-06-14 | Nippon Steel Corp | Shutdown of blast furnace |
| JPS53138913A (en) * | 1977-05-10 | 1978-12-04 | Nippon Steel Corp | Reblowing-in method for blast furnace being out of operation |
| JP6947345B1 (ja) * | 2020-05-15 | 2021-10-13 | Ｊｆｅスチール株式会社 | 高炉操業方法 |
-
2023
- 2023-05-11 WO PCT/JP2023/017685 patent/WO2023233957A1/fr unknown
- 2023-05-11 JP JP2023549669A patent/JPWO2023233957A1/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5271307A (en) * | 1975-12-11 | 1977-06-14 | Nippon Steel Corp | Shutdown of blast furnace |
| JPS53138913A (en) * | 1977-05-10 | 1978-12-04 | Nippon Steel Corp | Reblowing-in method for blast furnace being out of operation |
| JP6947345B1 (ja) * | 2020-05-15 | 2021-10-13 | Ｊｆｅスチール株式会社 | 高炉操業方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2023233957A1 (fr) | 2023-12-07 |
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