CN210916136U - Ultra-large integral gas supply brick for reducing carbon-oxygen deposit at converter end point in cooperation - Google Patents
Ultra-large integral gas supply brick for reducing carbon-oxygen deposit at converter end point in cooperation Download PDFInfo
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- CN210916136U CN210916136U CN201921379818.3U CN201921379818U CN210916136U CN 210916136 U CN210916136 U CN 210916136U CN 201921379818 U CN201921379818 U CN 201921379818U CN 210916136 U CN210916136 U CN 210916136U
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Abstract
An ultra-large integral type gas supply brick for reducing the carbon oxygen deposit at the end point of a converter in a matching manner comprises a high-grade magnesia carbon brick and a bundling pipe, wherein the bundling pipe is prefabricated in the high-grade magnesia carbon brick. Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses change into whole with the air brick, the internal diameter of air core enlarges, and the bundling pipe counts increases, and molten steel bubble dispersion when blowing argon at the bottom of can making the converter not only helps improving the long-pending 0.0020's of reduction converter terminal point carbon oxygen target, and its wholeness more is favorable to the bottom to blow the installation location when building by laying bricks or stones.
Description
Technical Field
The utility model relates to a steel mill converter steelmaking bottom blowing air feed brick technical field especially relates to a cooperation reduces super large-scale integral air feed brick of converter terminal point carbon oxygen deposit.
Background
The height of the end point carbon oxygen deposit of the converter molten steel is a key factor for measuring the quality of the molten steel, the goal of reasonably pursuing the end point carbon oxygen deposit of the converter to be 0.0020 becomes the development trend of domestic steel mills, and the following 3 ways are generally adopted for reducing the end point carbon oxygen deposit of the converter at present: 1. the strength and the time of bottom blowing air supply are increased. 2. And optimizing the position of the bottom blowing hole. 3. The top-blown oxygen flow rate was increased. The degree of erosion of the converter lining gas supply brick by the 3 methods is obviously increased. The existing bottom blowing design scheme is used for meeting the requirements of the large bottom blowing gas supply strength and the high-strength top blowing oxygen flow, the erosion of the air brick is easy to cause too fast, the material cost is greatly increased, and the target of 0.0020 carbon oxygen product is difficult to meet, so that the optimization of the use mode and the design scheme of the converter gas supply brick has important practical significance for reducing the carbon oxygen product at the end point of the converter. For large-scale converters in China, large-scale bundling tube type air bricks are generally formed by protective bricks and air permeable cores, the protective bricks are built firstly and then the gun cores are added in the converter building process, inconvenience is brought to building, and meanwhile the situation of inaccurate positioning can also occur.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cooperation reduces long-pending super-large-scale integral air feed brick of converter terminal point carbon oxygen, and air feed brick type is great, and integrated into one piece not only can satisfy big air feed intensity, and its wholeness more is favorable to the installation location in the work progress. The utility model discloses the dispersion of bubble in the molten steel when being favorable to blowing argon makes the molten steel stirring more even, increases bottom blowing life simultaneously, and converter terminal point carbon oxygen product is less than 0.0020, and typical value is 0.0018.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an ultra-large integral type gas supply brick for reducing the carbon oxygen deposit at the end point of a converter in a matching manner comprises a high-grade magnesia carbon brick and a bundling pipe, wherein the bundling pipe is prefabricated in the high-grade magnesia carbon brick.
The high-grade 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 sides, and the brick length L is 1300 mm; chord length D of large arc of large end face of brick body1500-720mm, radius R of the large arc1900 plus 2000mm, chord length d of small circular arc1Is 400-620mm, and the radius r of the small circular arc1800-1900 mm; chord length D of large arc of small end face of brick body2400-640mm, the radius R of the large arc2800-1850mm, chord length d of small arc2Is 350-580mm, and the radius r of the small circular arc2Is 650 and 1660 mm.
The bundling tube comprises 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 200 mm.
The diameter of a single-branch bundling tube in the bundling tube is 2-3mm, the single-branch bundling tubes are 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.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses air feed brick type is great, and integrated into one piece not only can satisfy big air feed intensity, and its wholeness more is favorable to the installation location in the work progress. The utility model discloses having increaseed the distribution range of bundling pipe, the dispersion of bubble in the molten steel when being favorable to blowing argon makes the molten steel stirring more even, adopts compound antioxidant simultaneously, improves the material and increases bottom blowing life, can effectively adapt to the long-pending 0.0020 target of converter terminal point carbon oxygen.
Drawings
Fig. 1 is a schematic view of the three-dimensional structure of the ultra-large integral air supply brick of the utility model.
Fig. 2 is a top view of the ultra-large integrated gas supply brick of the present invention (example 1).
In the figure: 1-bundling tube, 2-high grade magnesia carbon brick.
Detailed Description
The following further describes the embodiments of the present invention:
an ultra-large integral gas supply brick for reducing the carbon oxygen deposit at the end point of a converter in a matching manner comprises a high-grade magnesia carbon brick 2 and a bundling pipe 1, wherein the bundling pipe 1 is prefabricated in the high-grade magnesia carbon brick 2.
The high-grade 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 sides, and the brick length L is 1300 mm; chord length D of large arc of large end face of brick body1500-720mm, radius R of the large arc1900 plus 2000mm, chord length d of small circular arc1Is 400-620mm, and the radius r of the small circular arc1800-1900 mm; chord length D of large arc of small end face of brick body2400-640mm, the radius R of the large arc2800-1850mm, chord length d of small arc2Is 350-580mm, and the radius r of the small circular arc2Is 650 and 1660 mm.
The bundling tube comprises a main tube and a plurality of single bundling tubes, the main tube is communicated with the large end face of the high-grade magnesia carbon brick, the single bundling tubes are communicated with the small end face of the high-grade magnesia carbon brick, and the distribution range of the single bundling tubes is phi 90 mm-phi 200 mm.
The diameter of a single-branch bundling tube in the bundling tube is 2-3mm, the single-branch bundling tubes are 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.
The high-grade magnesia carbon brick is prepared from the following raw materials in parts by weight: 5-10 parts of large-crystal fused magnesia particles with the granularity being more than 3mm and less than or equal to 5mm, 10-35 parts of large-crystal fused magnesia particles with the granularity being more than 1mm and less than or equal to 3mm, 10-30 parts of large-crystal fused magnesia particles with the granularity being more than 0.1mm and less than or equal to 1mm, 2.5-3.5 parts of phenolic resin, 10-15 parts of large-scale graphite, less than or equal to 3.5 parts of 200-mesh 98-metal aluminum powder, less than or equal to 0.5 part of 325-mesh 98-metal silicon powder, less than or equal to 0.35 part of calcium boride, less than or equal to 0.35 part of boron carbide, less than or equal to 1 part of 4012-resin powder, less than or equal to 1 part of carbon-containing.
A preparation method of an ultra-large integral gas supply brick for reducing the carbon oxygen deposit at the end point of a converter in a matching manner is characterized by comprising the following steps:
1) mixing large-crystal fused magnesia particles with the particle size of more than 3mm and less than or equal to 5mm, large-crystal fused magnesia particles with the particle size of more than 1mm and less than or equal to 3mm, large-crystal fused magnesia particles with the particle size of less than or equal to 1mm, large-scale graphite, 200-mesh 98-metal aluminum powder, 325-mesh 98-metal silicon powder, calcium boride, boron carbide and large-crystal fused magnesia powder by using a grinding wheel type mixing machine for mixing and stirring for 3-5min, then slowly adding phenolic resin, 4012 resin powder and carbon-containing resin powder, stirring for more than 30min, and discharging, wherein the discharging temperature is controlled to be 55-60 ℃;
2) the mixed mud is fully trapped for 24-36 hours, the trapped mud is put into a die fixed with a bundling pipe, and after the mud is filled, a cold isostatic pressing device is adopted for molding, wherein the pressure system is 170Mpa (0-170Mpa,15 Min; maintaining the pressure at 170MPa for 5 Min; 170-0Mpa for pressure relief and 6Min), and keeping the pressure for 5-10 minutes;
3) drying the formed green brick in a drying kiln, and heating for 6 hours at the highest temperature of 260 ℃ (room temperature-80 ℃; heating at 80-120 deg.c for 2 hr; heating at the temperature of 120 ℃ and 260 ℃ for 8 hours; keeping the temperature at 260 ℃ for 5 hours), and keeping the temperature for 5 hours;
4) and cutting the dried green bricks, polishing and welding a bottom blowing pipe.
The utility model discloses a large-scale bottom blowing air feed brick, its width can account for stove bottom 2-4 ring bricks, divides chi thickness to account for its place circle 10 ~ 15 jiaos within ranges, and the bundling pipe is built by laying bricks or stones with air feed brick integrated into one piece, the installation of being convenient for. The cluster pipe is a stainless steel pipe with the inner diameter of 2-3mm, the fluctuation range is phi 90 mm-phi 200mm, the bottom blowing air supply strength can be effectively increased, and the dispersion effect of bubbles during molten steel stirring is facilitated. The utility model provides high air feed brick material grade, the antioxidant adopts boron carbide and calcium boride combined use, can effectively prevent graphite oxidation, improves life, can satisfy the long-pending 0.0020 target of converter terminal point carbon oxygen.
Example 1:
taking a 200t converter in a certain steel mill as an example, the production 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: 200t, average converter end point carbon oxygen deposit 0.00235, in order to reach 0.0020, a certain steel mill reduces the converter end point carbon oxygen deposit by increasing bottom blowing flow and top blowing oxygen flow, the method has large corrosion to the converter bottom blowing, a large amount of furnace supplement is needed, and the carbon oxygen deposit index is unstable.
The brick type design of the converter bottom brick is a large-scale integral gas supply brick, the length L of the gas supply brick is 1100mm, and the brick type design of the gas supply brick is shown in figure 2. The width of the gas supply brick accounts for 2 ring bricks at the bottom of the converter.
The aim of realizing the end point carbon oxygen product of the converter of 0.0020 can be realized by the following method:
the bottom blowing air supply brick for the 200t converter is prepared from the following raw materials in parts by weight: 98.2-grade large-crystal fused magnesia particles: 71 parts, positive 598 graphite: 14.5 parts, 3.5 parts of 98 metal aluminum powder, 0.5 part of 98 metal silicon powder, 0.35 part of calcium boride, 0.35 part of boron carbide, 1 part of 4012 resin powder, 1 part of carbon-containing resin powder, 7.8 parts of 98.2-grade large-crystal fused magnesia fine powder and phenolic resin: 2.8 parts.
Wherein, the 98.2-grade large-crystal fused magnesia particles are divided into 3 types of particle sizes: 10 parts of particles with the granularity of more than 3mm and less than or equal to 5mm, 33 parts of particles with the granularity of more than 1mm and less than or equal to 3mm and 28 parts of particles with the granularity of less than or equal to 1 mm.
The preparation method comprises the following steps: 1) mixing 98.2-grade macrocrystalline fused magnesia particles, positive 598 graphite, 98 metal aluminum powder, 98 metal silicon powder, calcium boride, boron carbide and 98.2-grade macrocrystalline fused magnesia fine powder by using a grinding wheel type mixing machine for stirring for 3-5min, slowly adding carbon-containing resin powder resin, 4012 resin powder and phenolic resin, stirring for 30min, and discharging;
2) and (3) ageing the mixed pug for 24 hours, filling the pug into a die fixed with a bundling pipe, molding by using an isostatic pressing device, keeping the molding pressure at 170Mpa for 10 minutes.
3) Drying the formed green brick by a drying kiln at 260 ℃ and preserving heat for 5 hours.
4) And cutting the dried green bricks, polishing and welding a bottom blowing pipe.
The produced air brick is conveyed to a steel mill for building, and the large integral air supply brick is installed without drilling holes in the later period and is convenient to build. The effect evaluation after the furnace service air supply brick is off-line is adopted: the design of the gas supply brick can meet the target of 0.0020 of the end point carbon oxygen deposit of the converter, the index is relatively stable, the residual thickness of the coil can meet the requirement, and the design of the gas supply brick makes a certain contribution to the stability of the end point carbon oxygen deposit index of the converter.
Claims (3)
1. An ultra-large integral type gas supply brick for reducing the carbon oxygen deposit at the end point of a converter in a matching manner is characterized by comprising a high-grade magnesia carbon brick and a bundling pipe, wherein the bundling pipe is prefabricated in the high-grade magnesia carbon brick;
the high-grade 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 sides, and the brick length L is 1300 mm; chord length D of large arc of large end face of brick body1500-720mm, radius R of the large arc1900 plus 2000mm, chord length d of small circular arc1Is 400-620mm, and the radius r of the small circular arc1800-1900 mm; chord length D of large arc of small end face of brick body2400-640mm, the radius R of the large arc2800-1850mm, chord length d of small arc2Is 350-580mm, and the radius r of the small circular arc2Is 650 and 1660 mm.
2. The ultra-large integral type gas supply brick for reducing the carbon oxygen deposit at the end point of the converter in cooperation with the method as claimed in claim 1, wherein the bundling pipe comprises a main pipe and a plurality of single-branch bundling pipes, the main pipe is communicated with the single-branch bundling pipes, and the distribution range of the single-branch bundling pipes is phi 90 mm-phi 200 mm.
3. The ultra-large integral type gas supply brick for reducing the carbon-oxygen deposit at the end point of the converter in a matching manner according to claim 1 or 2, wherein the diameter of each single cluster pipe in the cluster pipes is 2-3mm, the single cluster pipes are arranged in 4-6 rings, and the number of the arranged branches of each ring is 3-5 branches of the 1 st ring, 5-8 branches of the 2 nd ring, 8-10 branches of the 3 rd ring, 10-12 branches of the 4 th ring, 12-15 branches of the 5 th ring and 15-18 branches of the 6 th ring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921379818.3U CN210916136U (en) | 2019-08-23 | 2019-08-23 | Ultra-large integral gas supply brick for reducing carbon-oxygen deposit at converter end point in cooperation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921379818.3U CN210916136U (en) | 2019-08-23 | 2019-08-23 | Ultra-large integral gas supply brick for reducing carbon-oxygen deposit at converter end point in cooperation |
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| CN210916136U true CN210916136U (en) | 2020-07-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110396568A (en) * | 2019-08-23 | 2019-11-01 | 鞍山市和丰耐火材料有限公司 | A kind of cooperation reduces the ultra-large type monoblock type air supply brick of converter terminal carbon oxygen product |
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2019
- 2019-08-23 CN CN201921379818.3U patent/CN210916136U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110396568A (en) * | 2019-08-23 | 2019-11-01 | 鞍山市和丰耐火材料有限公司 | A kind of cooperation reduces the ultra-large type monoblock type air supply brick of converter terminal carbon oxygen product |
| CN110396568B (en) * | 2019-08-23 | 2024-05-14 | 鞍山市和丰耐火材料有限公司 | Ultra-large integral air supply brick for reducing carbon and oxygen accumulation at end point of converter in cooperation |
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