CN110396567B - Layout structure of furnace bottom gas supply bricks for reducing carbon-oxygen deposit at converter end point and bottom blowing process - Google Patents
Layout structure of furnace bottom gas supply bricks for reducing carbon-oxygen deposit at converter end point and bottom blowing process Download PDFInfo
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- CN110396567B CN110396567B CN201910783904.9A CN201910783904A CN110396567B CN 110396567 B CN110396567 B CN 110396567B CN 201910783904 A CN201910783904 A CN 201910783904A CN 110396567 B CN110396567 B CN 110396567B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
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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 relates to a layout structure of furnace bottom air supply bricks for reducing the end point carbon and oxygen deposit of a converter and a bottom blowing process, and the layout structure comprises 12-18 air supply bricks distributed at the bottom of the converter, wherein the 12-18 air supply bricks are respectively arranged on three circumferences with different diameters of an inner ring, a middle ring and an outer ring of the bottom of the converter; 4-6 air supply bricks are distributed on the inner ring, 4-6 air supply bricks are distributed on the middle ring, and 4-6 air supply bricks are distributed on the outer ring. The invention changes the arrangement mode of bottom blowing, and simultaneously controls the total flow of bottom blowing and the air supply intensity to reduce the carbon oxygen product at the end point of the converter, so that the average value of the carbon oxygen product at the end point of the converter can reach 0.0018, and the index is relatively stable. The invention has simple smelting operation, relatively stable carbon-oxygen deposit index, and improved molten steel cleanliness and alloy yield.
Description
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to a layout structure of furnace bottom gas supply bricks for reducing the end point carbon-oxygen deposit of a converter and a bottom blowing process.
Background
The method is characterized in that the level of the converter end point carbon oxygen deposit has important influence on the cleanliness of molten steel and the yield of alloy, the converter end point carbon oxygen deposit is a key index for producing high-quality clean steel, scientific researchers try various methods to reduce the converter end point carbon oxygen deposit, 1, waste magnesia carbon bricks are added into the molten steel, fluorite is introduced as a catalyst, and 2, the oxygen lance position, the oxygen supply intensity and the bottom blowing argon blowing intensity are reasonably adjusted to achieve the aim of reducing the converter end point carbon oxygen deposit by 0.0018. The method has relatively complex process operation and is not easy to control, and in addition, the carbon oxygen deposit index is unstable, so the research of a simple and effective mode for reducing the converter end point carbon oxygen deposit has important practical significance for improving the quality of steel.
Disclosure of Invention
The invention aims to provide a layout structure of furnace bottom gas supply bricks and a bottom blowing process for reducing the end point carbon oxygen deposit of a converter, which change the arrangement mode of bottom blowing, and simultaneously control the total flow and the gas supply intensity of bottom blowing to reduce the end point carbon oxygen deposit of the converter, and the method can ensure that the average value of the end point carbon oxygen deposit of the converter reaches 0.0018 and the indexes are relatively stable.
In order to achieve the purpose, the invention adopts the following technical scheme:
the layout structure of the furnace bottom gas supply bricks for reducing the carbon-oxygen deposit at the end point of the converter comprises 12-18 gas supply bricks distributed at the bottom of the converter, wherein the 12-18 gas supply bricks are respectively arranged on the circumferences of an inner ring, a middle ring and an outer ring of the bottom of the converter, which have different diameters; 4-6 air supply bricks are distributed on the inner ring, 4-6 air supply bricks are distributed on the middle ring, and 4-6 air supply bricks are distributed on the outer ring.
The layout structure of the furnace bottom gas supply bricks for reducing the endpoint carbon and oxygen deposit of the converter comprises 12 gas supply bricks distributed at the bottom of the converter, wherein the 12 gas supply bricks are respectively arranged on three circumferences of an inner ring, a middle ring and an outer ring of the furnace bottom, which have different diameters; 4 air supply bricks are distributed on the inner ring, wherein two air supply bricks are symmetrically arranged on a connecting line of the trunnion, and the other two air supply bricks are symmetrically arranged on a connecting line of the steel tapping side and the feeding side; the middle ring is distributed with 4 air supply bricks which are symmetrically arranged on a straight line which forms an angle of 45 degrees with the connecting line of the trunnion; the outer ring is provided with 4 air supply bricks which are symmetrically arranged on a straight line forming an angle of 22.5 degrees with the connecting line of the trunnion.
The layout structure of the furnace bottom gas supply bricks for reducing the endpoint carbon and oxygen deposit of the converter comprises 18 gas supply bricks distributed at the bottom of the converter, wherein the 18 gas supply bricks are respectively arranged on three circumferences of an inner ring, a middle ring and an outer ring of the furnace bottom, which have different diameters; 6 air feed bricks are evenly distributed on the inner ring, 6 air feed bricks are evenly distributed on the middle ring, 6 air feed bricks are evenly distributed on the outer ring, the air feed bricks on the inner ring and the air feed bricks on the outer ring are arranged at the same angle, and the air feed bricks on the middle ring, the air feed bricks on the inner ring and the air feed bricks on the outer ring are arranged at a staggered angle of 30 degrees.
The circumference diameter of the inner ring is 1800-2600mm, the circumference diameter of the middle ring is 2200-3200mm, and the circumference diameter of the outer ring is 2700-4000mm.
The gas supply brick comprises a magnesia carbon brick and a cluster pipe, wherein the cluster pipe is prefabricated in the magnesia carbon brick.
The magnesia carbon brick is a large-scale hearth brick, the brick shape is wedge-shaped, two opposite sides of the brick body are arc-shaped, the other two opposite sides are straight edges, and the brick length L is 900-1300mm; chord length D of great arc of brick body large end surface 1 Is 500-720mm, and the radius R of the large circular arc 1 Is 900-2000mm, the chord length d of the small circular arc 1 400-620mm, radius r of small circular arc 1 800-1900mm; chord length D of great arc of brick small end surface 2 400-640mm, radius R of large circular arc 2 Is 800-1850mm, and the chord length d of the small arc 2 350-580mm, radius r of small circular arc 2 Is 650-1660mm.
The bundling tube comprises a main tube and a plurality of single bundling tubes, the main tube is communicated with the single bundling tubes, and the distribution range of the single bundling tubes is phi 90 mm-phi 200mm.
The bottom blowing process for reducing the carbon-oxygen deposit at the end point of the converter by matching the layout structure of the air supply bricks at the bottom of the converter is characterized in that the smelting bottom blowing flow and the strength of the converter in each period have the following requirements: controlling the total flow of gas to 10-15Nm during iron charging 3 Min, strength 0.05-0.08Nm 3 T/min.t; the gas flow rate required in the blowing period is 30-35Nm 3 Min, intensity 0.15-0.20Nm 3 T is/min; the required gas flow is 10-15Nm when tapping 3 Min, strength 0.05-0.08Nm 3 T/min.t; the total flow of gas required in the slag splashing period is 15-22Nm 3 Min, strength 0.08-0.13Nm 3 T/min.t; the total flow of gas in the slag dumping and waiting period is 8-15Nm 3 Min, strength 0.04-0.08Nm 3 /min.t。
Compared with the prior art, the invention has the beneficial effects that:
the invention changes the arrangement mode of bottom blowing, and simultaneously controls the total flow of bottom blowing and the air supply intensity to reduce the carbon oxygen product at the end point of the converter, so that the average value of the carbon oxygen product at the end point of the converter can reach 0.0018, and the index is relatively stable. The invention has simple smelting operation, relatively stable carbon-oxygen deposit index, and improved molten steel cleanliness and alloy yield.
Drawings
FIG. 1 is a schematic view (I) of the distribution structure of the furnace bottom gas supply bricks of the present invention.
FIG. 2 is a schematic diagram (II) of the distribution structure of the furnace bottom gas supply bricks of the invention.
FIG. 3 is a schematic view of the construction of a single bottom feed brick of the present invention.
FIG. 4 is a schematic view of the structure of the bundling tube according to the present invention.
In the figure: 1-outer ring air supply brick, 2-middle ring air supply brick, 3-inner ring air supply brick, 4-bundling pipe, 5-magnesia carbon brick, 6-single bundling pipe and 7-main pipe.
Detailed Description
The following further illustrates embodiments of the invention:
the layout structure of the furnace bottom gas supply bricks for reducing the end point carbon-oxygen deposit of the converter comprises 12-18 gas supply bricks distributed at the bottom of the converter, wherein the 12-18 gas supply bricks are respectively arranged on three circumferences with different diameters of an inner ring, a middle ring and an outer ring of the furnace bottom; 4-6 air supply bricks are distributed on the inner ring, 4-6 air supply bricks are distributed on the middle ring, and 4-6 air supply bricks are distributed on the outer ring.
The first embodiment of the layout structure of the furnace bottom gas supply bricks for reducing the carbon-oxygen deposit at the end point of the converter is shown in figure 1, and comprises 12 gas supply bricks distributed at the bottom of the converter, wherein the 12 gas supply bricks are respectively arranged on three circumferences with different diameters of an inner ring, a middle ring and an outer ring of the furnace bottom; 4 air supply bricks are distributed on the inner ring, wherein two blocks are symmetrically arranged on a lug shaft connecting line, and the other two blocks are symmetrically arranged on a connecting line of the steel tapping side and the feeding side; 4 air supply bricks are distributed in the middle ring and symmetrically arranged on a straight line which forms an angle of 45 degrees with the connecting line of the trunnion; the outer ring is provided with 4 air supply bricks which are symmetrically arranged on a straight line forming an angle of 22.5 degrees with the connecting line of the trunnion.
The second embodiment of the layout structure of the furnace bottom gas supply bricks for reducing the terminal carbon oxygen deposit of the converter is shown in figure 2, and comprises 18 gas supply bricks distributed at the bottom of the converter, wherein the 18 gas supply bricks are respectively arranged on three circumferences of an inner ring, a middle ring and an outer ring of the furnace bottom, which have different diameters; 6 air feed bricks of inner ring equipartition, 6 air feed bricks of zhonghuan equipartition, 6 air feed bricks of outer loop equipartition, inner ring air feed brick 3 and outer loop air feed brick 1 are arranged at same angle, and zhonghuan air feed brick 2 and inner ring air feed brick 3 and outer loop air feed brick 1 are arranged in the angle of 30 degrees of staggering.
The circumference diameter of the inner ring is 1800-2600mm, the circumference diameter of the middle ring is 2200-3200mm, and the circumference diameter of the outer ring is 2700-4000mm. The circumferential diameter of the inner ring is preferably 1850.8mm, the circumferential diameter of the middle ring is preferably 2236.8mm, and the circumferential diameter of the outer ring is preferably 2798.6mm.
The gas supply brick comprises a magnesia carbon brick 5 and a bundling pipe 4, wherein the bundling pipe 4 is prefabricated in the magnesia carbon brick 5.
See fig. 3, magnesia carbon brick 5 is large-scale bottom brick, and the brick type is the wedge, and the relative both sides of the brick body are the circular arc type, and relative both sides are the straight flange in addition, and the preferred size of magnesia carbon brick 5 is: the brick length L is 1100mm; chord length D of great arc of brick body large end surface 1 567.7mm, radius R of the great circular arc 1 1766mm and the chord length d of the small circular arc 1 432.9mm, radius r of the small circular arc 1 1347mm; chord length D of great arc of brick small end surface 2 Is 460.3mm, radius R of the great circular arc 2 Is 1432mm, the chord length d of the small circular arc 2 Is 351mm, the radius r of the small circular arc 2 Is 1092mm.
Referring to fig. 4, the bundling tube 4 comprises a main tube 7 and a plurality of single-branch bundling tubes 6, the main tube 7 is communicated with the single-branch bundling tubes 6, and the distribution range of the single-branch bundling tubes 6 is phi 90 mm-phi 200mm.
The diameter of a single-branch bundling tube 6 in the bundling tube is 2-3mm, the single-branch bundling tube 6 is arranged in 4-6 rings, and the number of the arranged branches of each ring is 3-5 branches of a 1 st ring, 5-8 branches of a 2 nd ring, 8-10 branches of a 3 rd ring, 10-12 branches of a 4 th ring, 12-15 branches of a 5 th ring and 15-18 branches of a 6 th ring.
Example 1:
taking a 200-ton converter in a certain steel mill as an example, the smelting conditions are as follows: the average tapping temperature is 1665 ℃, the maximum tapping temperature is 1720 ℃, the smelting period is 48min, and the tapping amount is as follows: 200t. The design scheme of the furnace bottom gas supply brick is as follows: 12 air supply bricks are distributed on the bottom of the furnace, and the 12 air supply bricks are respectively arranged on three circumferences with different diameters of an inner ring, a middle ring and an outer ring of the bottom of the furnace; the circumference diameter of the inner ring is 2000mm, the circumference diameter of the middle ring is 3100mm, and the circumference diameter of the outer ring is 4000mm.
4 air supply bricks are distributed on the inner ring, wherein two blocks are symmetrically arranged on a lug shaft connecting line, and the other two blocks are symmetrically arranged on a connecting line of the steel tapping side and the feeding side; the middle ring is distributed with 4 air supply bricks which are symmetrically arranged on a straight line which forms an angle of 45 degrees with the connecting line of the trunnion; the outer ring is provided with 4 air supply bricks which are symmetrically arranged on a straight line forming an angle of 22.5 degrees with the connecting line of the trunnion.
The requirements of smelting bottom blowing flow and strength of the converter in each period are as follows: the total gas flow control during iron charging is 10Nm 3 Min, strength 0.05Nm 3 T.t, required gas flow 30Nm in the converting period 3 Min, strength 0.15Nm 3 T/min.t, required flow rate at tapping of 10Nm 3 Min, strength 0.05Nm 3 T, total gas flow rate required in slag splashing period of 20Nm 3 Min, intensity 0.1Nm 3 T, total gas flow rate in slag dumping and waiting period of 10Nm 3 Min, intensity 0.05Nm 3 /min.t。
The effect evaluation after the furnace is offline: by adopting the bottom blowing distribution and the air supply system, the average value of the carbon-oxygen products at the end point of the whole furnace service can reach 0.00188, and the indexes are relatively stable and easy to control.
Claims (5)
1. A layout structure of furnace bottom gas supply bricks for reducing the terminal carbon-oxygen deposit of a converter is characterized by comprising 12 gas supply bricks distributed at the bottom of the converter, wherein the 12 gas supply bricks are respectively arranged on the circumferences of an inner ring, a middle ring and an outer ring of the bottom of the converter with different diameters; 4 air supply bricks are distributed on the inner ring, wherein two air supply bricks are symmetrically arranged on a connecting line of the trunnion, and the other two air supply bricks are symmetrically arranged on a connecting line of the steel tapping side and the feeding side; the middle ring is distributed with 4 air supply bricks which are symmetrically arranged on a straight line which forms an angle of 45 degrees with the connecting line of the trunnion; 4 air supply bricks are distributed on the outer ring and are symmetrically arranged on a straight line forming an angle of 22.5 degrees with the connecting line of the trunnion;
the circumference diameter of the inner ring is 1800-2600mm, the circumference diameter of the middle ring is 2200-3200mm, and the circumference diameter of the outer ring is 2700-4000mm;
the gas supply brick comprises a magnesia carbon brick and a bundling pipe, and the bundling pipe is prefabricated in the magnesia carbon brick.
2. A layout structure of furnace bottom gas supply bricks for reducing the terminal carbon-oxygen deposit of a converter is characterized by comprising 18 gas supply bricks distributed at the bottom of the converter, wherein the 18 gas supply bricks are respectively arranged on the circumferences of an inner ring, a middle ring and an outer ring of the bottom of the converter with different diameters; 6 air supply bricks are uniformly distributed on the inner ring, 6 air supply bricks are uniformly distributed on the middle ring, 6 air supply bricks are uniformly distributed on the outer ring, the inner ring air supply bricks and the outer ring air supply bricks are arranged at the same angle, and the middle ring air supply bricks, the inner ring air supply bricks and the outer ring air supply bricks are arranged at an angle of 30 degrees in a staggered manner;
the circumference diameter of the inner ring is 1800-2600mm, the circumference diameter of the middle ring is 2200-3200mm, and the circumference diameter of the outer ring is 2700-4000mm;
the gas supply brick comprises a magnesia carbon brick and a bundling pipe, and the bundling pipe is prefabricated in the magnesia carbon brick.
3. The layout structure of the furnace bottom gas supply brick for reducing the terminal carbon oxygen deposit of the converter according to claim 1 or 2, characterized in that the magnesia carbon brick is a large-sized furnace bottom brick, the brick shape is wedge-shaped, two opposite sides of the brick body are arc-shaped, the other two opposite sides are straight sides, and the brick length L is 900-1300mm; chord length D of large arc of large end face of brick body 1 500-720mm, radius R of the great circular arc 1 Is 900-2000mm, the chord length d of the small circular arc 1 Is 400-620mm, and the radius r of the small circular arc 1 800-1900mm; chord length D of great arc of brick small end surface 2 Is 400-640mm, and the radius R of the large circular arc 2 Is 800-1850mm and the chord length d of the small arc 2 350-580mm, radius r of small circular arc 2 Is 650-1660mm.
4. The layout structure of the furnace bottom gas supply brick for reducing the terminal carbon oxygen deposit of the converter according to claim 1 or 2, characterized in that the bundling tubes comprise a main tube and a plurality of single-branch bundling tubes, the main tube is communicated with the single-branch bundling tubes, and the distribution range of the single-branch bundling tubes is phi 90 mm-phi 200mm.
5. The bottom-blowing process used in combination with the layout structure of the bottom-feeding bricks for reducing the carbon oxygen deposit at the end point of the converter according to any one of claims 1 to 4, wherein the requirements of the smelting bottom-blowing flow and the intensity of the converter at each period are as follows: controlling the total gas flow rate to 10-15Nm during iron adding 3 Min, strength 0.05-0.08Nm 3 Min. T; gas required in the converting periodFlow rate of 30-35Nm 3 Min, strength 0.15-0.20Nm 3 Min. T; the required gas flow is 10-15Nm during tapping 3 Min, strength 0.05-0.08Nm 3 /min·t；
The total flow of gas required in the slag splashing period is 15-22Nm 3 Min, strength 0.08-0.13Nm 3 Min. T; the total flow of gas in the slag dumping and waiting period is 8-15Nm 3 Min, strength 0.04-0.08Nm 3 /min·t。
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| CN110846459B (en) * | 2019-12-17 | 2023-09-15 | 中冶南方工程技术有限公司 | Converter and smelting method thereof |
| CN111041149A (en) * | 2019-12-23 | 2020-04-21 | 河钢股份有限公司承德分公司 | Method for improving bottom blowing effect of converter |
| CN111363881B (en) * | 2020-03-31 | 2021-05-07 | 钢铁研究总院 | Method for reducing free oxygen content of converter end-point metal molten pool |
| CN113930578B (en) * | 2021-08-30 | 2022-08-09 | 山东钢铁集团日照有限公司 | Optimization method of converter bottom blowing air brick |
| CN115232909A (en) * | 2022-07-27 | 2022-10-25 | 河南科技大学 | Converter bottom blowing method for converter steelmaking and converter |
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