CN118127252A - Method for increasing addition amount of scrap steel in front of blast furnace - Google Patents
Method for increasing addition amount of scrap steel in front of blast furnace Download PDFInfo
- Publication number
- CN118127252A CN118127252A CN202410315642.4A CN202410315642A CN118127252A CN 118127252 A CN118127252 A CN 118127252A CN 202410315642 A CN202410315642 A CN 202410315642A CN 118127252 A CN118127252 A CN 118127252A
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- Prior art keywords
- molten iron
- scrap
- steel
- blast furnace
- iron
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 63
- 239000010959 steel Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 142
- 229910052742 iron Inorganic materials 0.000 claims abstract description 71
- 238000007599 discharging Methods 0.000 claims abstract description 23
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 description 9
- 238000010079 rubber tapping Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000571 coke Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the field of blast furnace smelting, in particular to a method for improving the addition amount of scrap steel in front of a blast furnace, which comprises the following steps: step one: the self-discharging efficiency of the steel scrap bucket is improved; step two: improving the flow rate of molten iron: the drill bit is increased to 60mm-65mm when the iron notch is opened, and the initial opening molten iron flow rate, namely the initial molten iron flow rate, is increased to 5-6t/min; step three: and stabilizing the temperature of molten iron. The invention improves the addition amount of the scrap steel and reduces the ton iron power cost: (13000 tons of scrap can be added to reduce the ton iron power cost by 0.55 yuan), and the addition amount of 12000 tons of scrap per month is increased to 19000 tons in the example of a 5# blast furnace. Calculated as 300000 tons per month of the blast furnace: monthly ton iron cost reduction = 19000 +.13000 x 0.55 x 300000 ≡ 241153 yuan.
Description
Technical Field
The invention relates to the field of blast furnace smelting, in particular to a method for increasing the addition amount of scrap steel in front of a blast furnace and reducing the power cost of the blast furnace.
Background
The addition of scrap steel in molten iron can reduce ore utilization and is beneficial to reducing the influence and damage to the environment. Meanwhile, the waste steel can be added into the molten iron to reduce the power cost of the blast furnace per ton iron, and the effects of reducing the production pressure and improving the production speed and the production efficiency of the molten iron are achieved. At present, the five and six blast furnaces are added with molten iron and scrap steel, the addition amount is about 1000 tons to 1200 tons and is far less than 1800 tons to 2000 tons of theoretical addition amount under the influence of external environment and stability of blast furnace conditions.
Therefore, a new adding method is needed to improve and break through the limiting factor of the adding amount mode of the single scrap steel.
The invention aims to increase the addition amount of scrap steel in front of a blast furnace so as to reduce the ton iron power cost of the blast furnace.
Disclosure of Invention
The invention aims to solve the problems and provides a method for improving the addition amount of scrap steel in front of a blast furnace.
The purpose of the invention is realized in the following way: a method for improving the addition amount of scrap steel in front of a blast furnace comprises the following steps: step one: improve the self-discharging efficiency of the steel scrap bucket: 1) Keeping the discharging inclination of the inner wall of the scrap steel hopper at 45-60 degrees, 2) keeping a discharging door baffle plate and a connecting rod of a door at a horizontal straight line, wherein a door shaft cannot be positioned between discharging openings, and the distance between the door shaft and the discharging inner wall is 3-5 cm; step two: improving the flow rate of molten iron: the drill bit is increased to 60mm-65mm when the iron notch is opened, and the initial opening molten iron flow rate, namely the initial molten iron flow rate, is increased to 5-6t/min; step three: and stabilizing the temperature of molten iron.
And in the third step, the temperature of the molten iron is stabilized to 1510-1520 ℃.
The beneficial effects of the invention are as follows: the adding amount of scrap steel is improved, and the ton iron power cost is reduced: (13000 tons of scrap can be added to reduce the ton iron power cost by 0.55 yuan), and the addition amount of 12000 tons of scrap per month is increased to 19000 tons in the example of a 5# blast furnace. Calculated as 300000 tons per month of the blast furnace: monthly ton iron cost reduction = 19000 +.13000 x 0.55 x 300000 ≡ 241153 yuan.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a diagram of the present invention.
Wherein: 1. the steel scrap bucket charging space, the steel scrap bucket inner wall, the steel scrap bucket discharging direction, the door opening and closing connecting rod, the door shaft, the gap of 3-5cm, the steel scrap bucket charging space, the steel scrap bucket inner wall, the steel scrap bucket discharging direction, the steel scrap bucket opening and closing connecting rod, the steel scrap bucket door shaft, the steel scrap bucket gap of 3-5cm, the steel scrap bucket discharging opening and the steel scrap bucket discharging door rail.
Detailed Description
In order to achieve the purposes of increasing the addition amount of scrap steel and reducing the power cost of the blast furnace, the technical scheme comprises the following steps: 1. improve the self-discharging efficiency of the steel scrap bucket: 1) And the inclination of the inner wall of the steel scrap hopper is properly improved according to the humidity and cohesiveness of the steel scrap, and the blanking inclination of the inner wall of the steel scrap hopper reaches 45-60 degrees. 2) The blanking door stop adopts a straight-line structure (the straight-line structure refers to the design of a blanking door stop plate and a connecting rod for opening a door which are positioned in a horizontal straight line, and a blanking hopper in the past: the blanking door stop uses a two-side turning plate structure, and the door shaft is arranged at the middle position of the blanking opening, because the scrap steel is irregularly shaped, and long iron wires and the like are also arranged, the blanking door stop can be wound on the blanking door in actual blanking to cause serious clamping, so that the blanking door shaft is moved to a position below the oblique side of the blanking inner wall to prevent the door shaft from being blocked by the scrap. In order to prevent the door shaft from clamping, the door shaft is not positioned between the discharging openings, and the distance between the door shaft and the inner wall of the discharging opening is kept 3-5 cm.
2. Improving the flow rate of molten iron: the iron runner blanking is carried out by means of molten iron scouring, and when the iron notch is initially opened, the molten iron flow rate is too low, and only the single mode of blanking by means of the swinging nozzle cover plate observation hole is adopted. Therefore, the opening aperture is properly lifted, and the double-blanking mode feeding can be performed in advance to increase the addition amount of the scrap steel by improving the flow rate of the molten iron. 1) When the tapping hole is opened, the original 50mm-55mm drill bit is increased to 60mm-65mm, and the initial tapping molten iron flow rate, namely the initial molten iron flow rate, is increased from 3-4t/min to 5-6t/min. And because the initial pore canal is changed greatly and the natural reaming time is shortened (about 30 minutes is needed for the iron amount to rise from 3-4t/min to 7-8t/min after the 50mm-55mm drill bit opens the iron notch, about 10 minutes is needed for the iron amount to rise from 5-6t/min to 7-8t/min after the 60mm-65mm drill bit opens the iron ore, and the ideal molten iron scouring amount is advanced by 20 minutes), the method can shorten the time from the initial molten iron flow rate to the standard flow rate, and can add the scrap steel in a double feeding mode in advance, improve the time utilization rate and increase the scrap steel adding amount. 2) And optimizing the operation method of the tapping hole to ensure that the tapping hole is smoothly opened and avoid the phenomenon of tapping hole leakage and tapping hole burning.
3. Stabilizing the temperature of molten iron: if the temperature of the molten iron is too low, the molten iron in the torpedo tank is frozen, and the iron runner and the swinging launder gather materials to cause production accidents; if the temperature of the molten iron is high, the production cost of the blast furnace is increased. Therefore, the stable molten iron temperature (1510-1520 ℃) can well improve the softening and melting effects of the scrap steel. 1) Reasonably optimizing a basic operation system: a blanking system, an air supply system, a heat system and a slagging system. The diameter and length of the air opening are adjusted to realize high wind speed and high blast and form reasonable gas flow distribution. 2) And the distribution is reasonably optimized, the gas utilization rate is improved, the edge airflow distribution is reduced, and the heat loss is reduced. The fuel ratio is timely adjusted according to the performance of the raw fuel and the change of the gas flow, so that the temperature stability of molten iron is ensured, for example, the ash content of coke is increased by 1%, and the fuel ratio is increased by 1%. 3) And the slag iron in the furnace is discharged in a balanced and stable manner in time, so that the fluctuation of the furnace condition caused by wind holding is avoided.
Example 1
The implementation time is as follows: 2023, 6, implementation site: front of five blast furnaces in Tai steel ironworks.
1. Improve the self-discharging efficiency of the steel scrap bucket: 1) And the inclination of the inner wall of the scrap steel hopper is selected to be 50 degrees according to the dryness and the humidity of the scrap steel materials, so that the automatic discharging fluency of the scrap steel materials under the dead weight is ensured. 2) The blanking door stop is transformed to be in a straight-line structure. In order to prevent the clamping of the door shaft, a steel plate is used for blocking the door shaft seal, and the distance between the door shaft and the inner wall of the blanking is kept at 5 cm.
2. Improve the size of the tap hole drill bit and improve the flow rate of molten iron: and (3) selecting a 60mm drill bit to open the iron notch, and using a swinging nozzle cover plate to observe hole blanking when the initial flow rate is 5-6 t/min. After the flow rate of molten iron is increased to 7-8t/min for about 10 minutes, the scrap steel is added uniformly by adopting a double feeding mode of iron runner blanking and swinging nozzle cover plate observation hole blanking.
3. Stabilizing the temperature of molten iron: 1) Timely adjusting the fuel ratio according to the performance of the raw fuel and the change of the gas flow: for example, the coke ash content is increased by 1% and the fuel ratio is increased by 1%. 2) The diameter and length of 24 air openings are adjusted (130 # is changed into 120 #), so that high wind speed and high blast are realized, and reasonable gas flow distribution is formed. 3) The distribution is reasonably optimized, the gas utilization rate is improved, the edge airflow distribution is reduced, and the heat loss is reduced. 4) And the slag iron in the furnace is discharged in a balanced and stable manner in time, so that the fluctuation of the furnace condition caused by wind holding is avoided. The molten iron temperature is controlled to 1515 DEG + -5 DEG in 6 months of 2023, so that the effective utilization of the molten iron temperature is ensured.
The steel scrap addition was increased to 19753 tons/month by implementing a method of increasing the steel scrap addition in month 6 of 2023.
Example two
The implementation time is as follows: 2023, 7, site of implementation: front of five blast furnaces in Tai steel ironworks.
1. Improve the self-discharging efficiency of the steel scrap bucket: 1) And the inclination of the inner wall of the scrap steel hopper is selected to be 50 degrees according to the dryness and the humidity of the scrap steel materials, so that the automatic discharging fluency of the scrap steel materials under the dead weight is ensured. 2) The blanking door stop is transformed to be in a straight-line structure. In order to prevent the clamping of the door shaft, a steel plate is used for blocking the door shaft seal, and the distance between the door shaft and the inner wall of the blanking is kept at 5 cm.
2. Improve the size of the tap hole drill bit and improve the flow rate of molten iron: and (3) selecting a 65mm drill bit to open the iron notch, and using a swinging nozzle cover plate to observe hole blanking when the initial flow rate is 6 t/min. After the flow rate of molten iron is increased to 8t/min for about 10 minutes, the scrap steel is added uniformly by adopting a double feeding mode of iron runner blanking and swinging nozzle cover plate observation hole blanking.
3. Stabilizing the temperature of molten iron: 1) Timely adjusting the fuel ratio according to the performance of the raw fuel and the change of the gas flow: for example, the coke ash content is increased by 1% and the fuel ratio is increased by 1%. 2) The diameter and length of 24 air openings are adjusted (130 # is changed into 120 #), so that high wind speed and high blast are realized, and reasonable gas flow distribution is formed. 3) The distribution is reasonably optimized, the gas utilization rate is improved, the edge airflow distribution is reduced, and the heat loss is reduced. 4) And the slag iron in the furnace is discharged in a balanced and stable manner in time, so that the fluctuation of the furnace condition caused by wind holding is avoided. The molten iron temperature is controlled to 1520 DEG + -5 DEG in 7 months of 2023, so that the effective utilization of the molten iron temperature is ensured.
The amount of steel scrap added was increased to 19753 tons/month by carrying out a method of increasing the amount of steel scrap added in month 7 of 2023.
According to the method, the scrap steel is added uniformly by improving the self-discharging efficiency of the scrap steel hopper, improving the flow rate of molten iron, the temperature of molten iron and the combination of the feeding mode of the iron runner and the feeding mode of the swinging nozzle cover plate observation hole, so that the limiting factor of single scrap steel addition is broken through, and the addition amount of the scrap steel is increased.
The above embodiments are merely examples of the present invention, but the present invention is not limited to the above embodiments, and any changes or modifications within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (2)
1. A method for improving the addition amount of scrap steel in front of a blast furnace is characterized by comprising the following steps: the method comprises the following steps:
Step one: improve the self-discharging efficiency of the steel scrap bucket: 1) Keeping the discharging inclination of the inner wall of the scrap steel hopper at 45-60 degrees, 2) keeping a discharging door baffle plate and a connecting rod of a door at a horizontal straight line, wherein a door shaft cannot be positioned between discharging openings, and the distance between the door shaft and the discharging inner wall is 3-5 cm;
Step two: improving the flow rate of molten iron: the drill bit is increased to 60mm-65mm when the iron notch is opened, and the initial opening molten iron flow rate, namely the initial molten iron flow rate, is increased to 5-6t/min;
Step three: and stabilizing the temperature of molten iron.
2. The method for increasing the addition amount of scrap steel in front of a blast furnace according to claim 1, wherein: and in the third step, the temperature of the molten iron is stabilized to 1510-1520 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410315642.4A CN118127252A (en) | 2024-03-19 | 2024-03-19 | Method for increasing addition amount of scrap steel in front of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410315642.4A CN118127252A (en) | 2024-03-19 | 2024-03-19 | Method for increasing addition amount of scrap steel in front of blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118127252A true CN118127252A (en) | 2024-06-04 |
Family
ID=91231277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410315642.4A Pending CN118127252A (en) | 2024-03-19 | 2024-03-19 | Method for increasing addition amount of scrap steel in front of blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118127252A (en) |
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2024
- 2024-03-19 CN CN202410315642.4A patent/CN118127252A/en active Pending
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