CN108504807B - Leveling control method for blast furnace bottom refractory material construction - Google Patents
Leveling control method for blast furnace bottom refractory material construction Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/04—Blast furnaces with special refractories
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Abstract
The invention particularly relates to a leveling control method for blast furnace bottom refractory material construction; the method is characterized in that: taking the central line of the water-cooled tube as a top, and performing castable construction; after the castable construction is finished, leveling the elevation for the carbon ramming material by taking the actual installation elevation of the tuyere center as a reference, and drawing a sideline of a flat steel and an angle steel upright column on a furnace bottom plate; after the flat steel in a row is completely placed, fixing the two ends by spot welding; after spot welding of all the flat steel and the angle steel upright posts is finished, the flatness of the flat steel and the angle steel upright posts is checked again through measurement, no error is found, and finally the flat steel and the angle steel are fully welded; polishing and flattening the local scabs by using an angle grinder; constructing ramming materials; when the last layer is beaten, a leveling scraper is used for leveling along the surface of the flat steel strip, and a polishing machine is used for leveling, and the next procedure is carried out. The method has high control precision, greatly improves the construction quality of refractory materials at the bottom of the furnace, and is convenient to popularize.
Description
Technical Field
The invention relates to the field of blast furnace construction, in particular to a leveling control method for blast furnace bottom refractory material construction.
Background
The blast furnace iron-making technology has long-term development, has the advantages of simple process, high yield, high efficiency, low energy consumption and the like, has good economic indexes, and is a main method for producing steel on a large scale at present.
The life of the refractory brick lining of a blast furnace, particularly the life of the bottom of the blast furnace, determines the life of the blast furnace during the construction of the blast furnace. The large and medium blast furnaces in China mostly adopt full-carbon brick furnaces or carbon brick and high-alumina brick comprehensive furnaces, and are leveled by carbon ramming mass under the carbon brick furnaces. The primary condition for ensuring the smooth laying of the carbon bricks is the leveling of the carbon ramming mass. Although the carbon ramming mass has the characteristics of high thermal conductivity, no harmful gas loss in normal-temperature construction, better construction labor conditions and the like, the main raw material of the carbon ramming mass is artificial graphite, and due to the inherent characteristics of the artificial graphite, the construction ramming compactness is low, and the leveling is difficult, so that the heat transfer condition of the furnace bottom is influenced.
The literature search of the prior art finds that the literature report for solving the problems is relatively rare. In a blast furnace bottom carbon ramming mass leveling device (CN201320316262.X), Zhang et al propose a leveling device for leveling a ramming mass higher than a reference after a leveling reference is completed, with a shovel head and a shovel rod having one end connected to the middle part of the shovel head and forming an angle of 45 degrees with the horizontal plane. But does not solve the leveling reference problem of the furnace bottom ramming material.
Disclosure of Invention
The invention aims to solve the problem of difficult leveling of carbon ramming materials at the bottom of a blast furnace, and provides a leveling control method for blast furnace bottom refractory material construction, which ensures the construction quality and improves the heat conduction efficiency of the bottom of an oversize blast furnace.
In order to achieve the above object, the present invention is realized by:
step one, after the pouring of a blast furnace foundation is finished and a furnace shell is installed to be above an air port, cleaning the furnace bottom;
secondly, performing castable construction by taking the central line of the water-cooled tube as a top; pouring the castable firstly; the pouring is carried out from two sides to the middle I-beam one by one, and the water adding amount is strictly controlled according to the specification when the pouring material is stirred; during pouring, a miniature inserted vibrating rod is used for carefully vibrating, and then a special scraper is used for leveling according to the center of the water-cooling pipe, wherein the error is controlled to be +/-10 mm; the stirred castable is transported to a construction point by a trolley and poured from inside to outside;
thirdly, after the construction of the castable is finished, taking the actual installation elevation of the center of the tuyere as a reference, returning the actual installation elevation downwards to the elevation of the surface of the carbon ramming layer according to the vertical dimension determined by the thickness of the brick layers of the furnace bottom and the furnace wall, namely the leveling elevation of the carbon ramming material, and throwing the elevation point to the furnace wall; drawing a sideline of a flat steel and an angle steel upright post on a furnace bottom plate by taking a cross center line in the furnace as a reference; the distance between the flat steels is 800mm, and the distance between the angle steels is 400 mm;
welding angle steel upright posts at two ends of each row of flat steel, clamping a flat steel surface close to one wing of each angle steel upright post by using a bow clamp, and padding the flat steel below the flat steel every 2m or so in the middle;
step five, after the flat steel in a row is completely placed, measuring and leveling by using a level meter, and fixing two ends by spot welding after finishing leveling each row of flat steel;
and step six, after all the flat steels and the angle steel stand columns are subjected to spot welding, the flatness of the flat steels and the angle steel stand columns is checked again through measurement, no error is confirmed, and finally the flat steels and the angle steels are subjected to full welding. Joints of two adjacent sections of flat steel are placed at the angle steel upright posts;
step seven, after all the flat steel nets are welded, performing the last inspection by measurement; polishing and flattening the local scabs by using an angle grinder;
step eight: constructing ramming materials; the thickness of each layer of spreading materials is controlled according to the specified size, the material surface is strickled off by a scraping plate, and particularly, when a first layer of materials is tamped, a batten is applied to a gap between a flat steel and a furnace bottom to block the gap, so that carbon materials are prevented from being extruded out when the first layer of materials is tamped; when in tamping, firstly, a pneumatic pick is used for tamping forwards along two sides of the flat steel in a mode of pressing a hammer and a half hammer, and particularly, the corners of the angle steel upright posts are tamped for 5-6 times until the pressing amount reaches the design requirement;
step nine: when the last layer is rammed, the height of the layer is 2-3 mm higher than that of the flat steel, a leveling scraper is used for leveling along the surface of the flat steel strip, a polishing machine is used for leveling, and the next procedure is carried out.
The invention adopts the characteristic that the edge stress deformation of the flat steel material is far smaller than that of a flat surface, effectively reduces stress deformation interference caused by welding and other working procedures in construction, and ensures the construction flatness control of the refractory material at the bottom of the furnace; the method has high control precision, greatly improves the construction quality of refractory materials at the bottom of the furnace, and is convenient to popularize.
Drawings
FIG. 1 is a schematic diagram of a pouring sequence of the castable at the bottom of the furnace.
FIG. 2 is a schematic view of a flat steel mesh layout.
FIG. 3 is a schematic plan view of a sectional and segmented stave installation.
FIG. 4 is a formwork for pouring the gap filler between the cooling walls.
FIG. 5 is a schematic view showing the filling of the gap between the cooling walls to form a closed loop.
Detailed Description
The invention is further illustrated by the following specific examples.
As shown in fig. 5, a leveling control method for the construction of the refractory material at the bottom of the blast furnace; comprises that
The method comprises the following steps: after the blast furnace foundation is poured, installing a furnace shell to be above the tuyere, and cleaning the furnace bottom;
step two: as shown in fig. 1, the center line of the water-cooled tube is used as a top to carry out castable construction; pouring with a pouring material. The pouring is carried out from two sides to the middle I-beam one by one, and the water adding amount is strictly controlled according to the specification when the pouring material is stirred. During pouring, the water is carefully vibrated by a miniature inserted vibrating rod, and then the center of the water-cooled tube is leveled by a special scraper, and the error is controlled to be +/-10 mm. The stirred castable is transported to a construction point by a trolley and poured according to the direction shown;
step three: after the construction of the casting material is finished, the actual installation elevation (average value) of the center of the tuyere is taken as a reference, the vertical dimension determined according to the thickness (including mortar joints) of the brick layers of the furnace bottom and the furnace wall is returned downwards to the elevation of the surface of the carbon ramming mass, namely the leveling elevation of the carbon ramming mass, and the elevation point is thrown onto the furnace wall. And drawing side lines of the flat steel and the angle steel upright posts on the furnace bottom plate by taking the cross center line in the furnace as a reference. The distance between the flat steels is 800mm, and the distance between the angle steels is 400mm (as shown in figure 2).
Step four: the angle steel upright posts at two ends of each row of flat steel are welded firstly, then a bow clamp is used for clamping the flat steel surface to be tightly attached to one wing of each angle steel upright post, and wood wedges are used for cushioning the lower surface of the flat steel every 2m or so in the middle.
Step five: and measuring and leveling by using a level meter after the flat steels in a row are completely placed, and fixing the two ends by spot welding after the flat steels in a row are leveled.
As shown in fig. 4, step six: and after spot welding of all the flat steel and the angle steel upright posts is finished, the flatness of the flat steel and the angle steel upright posts is checked again through measurement, no error is confirmed, and finally the flat steel and the angle steel are fully welded. The joints of two adjacent sections of flat steel are placed at the angle steel upright posts.
Step seven: and (5) after all the flat steel meshes are welded, performing the last check by measurement. Polishing and flattening the local scabs by using an angle grinder;
as shown in fig. 5, step eight: and (5) ramming material construction. The thickness of each layer of spreading material is controlled according to the specified size (generally 100-150 mm), and the material surface is scraped flat by a scraping plate, especially when the first layer of material is rammed, a batten is applied to block the gap between the flat steel and the furnace bottom, so that the carbon material is prevented from being extruded out during ramming. When in tamping, the pneumatic pick is firstly used for tamping forwards along two sides of the flat steel in a mode of pressing a hammer and a half hammer, and particularly, the corners of the angle steel upright posts are tamped for 5-6 times until the pressing amount reaches the design requirement.
Step nine: and (3) when the last layer is rammed, the height of the last layer is 2-3 mm higher than that of the flat steel, a leveling scraper is used for leveling along the surface of the flat steel strip, a polishing machine is used for leveling as shown in figure 3, and the next procedure is carried out.
The invention adopts the characteristic that the edge stress deformation of the flat steel material is far smaller than that of a flat surface, effectively reduces stress deformation interference caused by welding and other working procedures in construction, and ensures the construction flatness control of the refractory material at the bottom of the furnace; the method has high control precision, greatly improves the construction quality of refractory materials at the bottom of the furnace and is convenient to popularize.
Claims (1)
1. A leveling control method for blast furnace bottom refractory material construction is characterized by comprising the following steps:
step one, after the pouring of a blast furnace foundation is finished and a furnace shell is installed to be above an air port, cleaning the furnace bottom;
secondly, performing castable construction by taking the central line of the water-cooled tube as a top; pouring the castable firstly; the pouring is carried out from two sides to the middle I-beam one by one, and the water adding amount is strictly controlled according to the specification when the pouring material is stirred; during pouring, a miniature inserted vibrating rod is used for carefully vibrating, and then a special scraper is used for leveling according to the center of the water-cooling pipe, wherein the error is controlled to be +/-10 mm; the stirred castable is transported to a construction point by a trolley and poured from inside to outside;
thirdly, after the construction of the castable is finished, taking the actual installation elevation of the center of the tuyere as a reference, returning the actual installation elevation downwards to the elevation of the surface of the carbon ramming layer according to the vertical dimension determined by the thickness of the brick layers of the furnace bottom and the furnace wall, namely the leveling elevation of the carbon ramming material, and throwing the elevation point to the furnace wall; drawing a sideline of a flat steel and an angle steel upright post on a furnace bottom plate by taking a cross center line in the furnace as a reference; the distance between the flat steels is 800mm, and the distance between the angle steels is 400 mm;
welding angle steel upright posts at two ends of each row of flat steel, clamping a flat steel surface close to one wing of each angle steel upright post by using a bow clamp, and padding the flat steel below the flat steel every 2m or so in the middle;
step five, after the flat steel in a row is completely placed, measuring and leveling by using a level meter, and fixing two ends by spot welding after finishing leveling each row of flat steel;
step six, after all the flat steels and the angle steel stand columns are subjected to spot welding, the flatness of the flat steels and the angle steel stand columns is checked again through measurement, no error is confirmed, and finally the flat steels and the angle steels are subjected to full welding;
joints of two adjacent sections of flat steel are placed at the angle steel upright posts;
step seven, after all the flat steel nets are welded, performing the last inspection by measurement; polishing and flattening the local scabs by using an angle grinder;
step eight: constructing ramming materials; the thickness of each layer of spreading materials is controlled according to the specified size, the material surface is strickled off by a scraping plate, and particularly, when a first layer of materials is tamped, a batten is applied to a gap between a flat steel and a furnace bottom to block the gap, so that carbon materials are prevented from being extruded out when the first layer of materials is tamped; when in tamping, firstly, a pneumatic pick is used for tamping forwards along two sides of the flat steel in a mode of pressing a hammer and a half hammer, and particularly, the corners of the angle steel upright posts are tamped for 5-6 times until the pressing amount reaches the design requirement;
step nine: when the last layer is rammed, the height of the layer is 2-3 mm higher than that of the flat steel, a leveling scraper is used for leveling along the surface of the flat steel strip, a polishing machine is used for leveling, and the next procedure is carried out.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108929928A (en) * | 2018-09-12 | 2018-12-04 | 北京联合荣大工程材料股份有限公司 | A kind of blast furnace bottom leveling construction method |
| CN111518974B (en) * | 2020-04-24 | 2021-10-01 | 五冶集团上海有限公司 | Method for controlling building flatness of fully-laid carbon bricks at bottom of blast furnace |
| CN111926131A (en) * | 2020-07-17 | 2020-11-13 | 上海宝冶冶金工程有限公司 | Ramming material construction control tool |
| CN115181823A (en) * | 2022-07-08 | 2022-10-14 | 山西太钢不锈钢股份有限公司 | Quantitative construction method for carbon ramming material of blast furnace hearth |
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