CN109439825B - Method for prolonging service life of blast furnace main channel - Google Patents

Method for prolonging service life of blast furnace main channel Download PDF

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Publication number
CN109439825B
CN109439825B CN201811515586.XA CN201811515586A CN109439825B CN 109439825 B CN109439825 B CN 109439825B CN 201811515586 A CN201811515586 A CN 201811515586A CN 109439825 B CN109439825 B CN 109439825B
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microporous
blast furnace
main channel
lining
brick
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CN109439825A (en
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张正东
尹腾
郑华伟
谢友阳
罗鹏飞
朱义斌
李昕
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B7/00Blast furnaces
    • C21B7/14Discharging devices, e.g. for slag
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B7/00Blast furnaces
    • C21B7/04Blast furnaces with special refractories

Abstract

The invention provides a method for prolonging the service life of a blast furnace main channel, which comprises the following steps: the blast furnace main channel steel channel is internally provided with a lining, a microporous carbon brick layer and a cooling wall in sequence from the inside (hot surface) to the outside (cold surface), wherein the lining is a microporous corundum brick layer. The lining refractory material adopted by the invention is not easy to be corroded by iron slag and resistant to mechanical erosion, the temperature of the surface of the lining refractory material is reduced through the cooling wall, and a layer of iron slag protective layer is formed on the surface of the lining refractory material, so that the lining is self-protected, the corrosion of the refractory material on the surface of the main groove is slowed down or prevented from being corroded, and the service life of the blast furnace main groove is prolonged.

Description

Method for prolonging service life of blast furnace main channel
Technical Field
The invention belongs to the technical field of blast furnace main ditch design, and particularly relates to a method for prolonging the service life of a blast furnace main ditch, which can be applied to main ditch design of major repair or newly-built blast furnaces and major repair and reconstruction of blast furnace main ditches put into operation.
Background
In the blast furnace iron-making production process, a blast furnace main channel is a channel through which slag and molten iron flow and are separated. In the main channel, slag and iron liquid are separated automatically due to different specific gravity, molten iron enters a molten iron loading tool through a sand port and is conveyed to a steel making or iron casting process, and the slag liquid is blocked by a skimmer and enters a slag treatment system, so that the main channel of the blast furnace is necessary equipment for blast furnace iron making, the service life of the main channel of the blast furnace is prolonged, and the benefit and the efficiency of iron making related to maintenance and repair are achieved.
The large-scale blast furnace generally adopts four main ditches, two tapping are used for standby, when the tapping main ditches are corroded to a certain degree, the standby tap hole is poured, and the original tapping main ditches are overhauled, poured and baked for standby. The medium and small blast furnaces adopt two main ditches, one is used and the other is standby or dual-purpose, when which main ditch needs to be overhauled, the other main ditch is continuously used, and as the traditional main ditches are long in overhauling time, tapping organization and furnace conditions are influenced to a certain extent.
The high-temperature slag iron liquid flows rapidly in the main channel to generate scouring action on refractory materials in the main channel; reacting part of components in the iron slag liquid with refractory materials; the temperature difference inside the refractory material is large, and cracks and spalling are generated. These factors cause the refractory material erosion of the main ditch, namely, better refractory materials are used, the iron passing amount is about 20 ten thousand tons/time, the service cycle of a large-scale blast furnace is about 40 days, and the blast furnace needs to be reversed to use a spare iron notch to pour the original main ditch again. Before pouring, residual refractory materials on the inner surface of the main ditch are cleaned, about 30 tons of refractory materials are poured into the ditch, the main ditch is poured again, about 60 tons of castable materials are needed for small-scale overhaul (the length of the main ditch is calculated according to the length of 10 m), and about 140 tons of refractory materials are needed for major overhaul. After the refractory material is shaped, the channel mold is taken out and baked by coke oven gas fire. The main ditch is cleaned, poured and stripped for 10 days, and is baked for 30 days by coal gas. A large amount of refractory materials and coal gas are wasted, and solid waste is increased; meanwhile, equipment investment such as a tapping machine, a mud gun, dust prevention, a swinging nozzle or an extended slag iron runner is required to be added.
The traditional main ditch has short service life because the components, the manufacturing process and the protective measures of the material are not in place. The working layer refractory material of the traditional main channel contains SiC and SiO2Easy oxidation of SiC, SiO2Are easily eroded by CaO. The non-water cooling, resistant material temperature is high, and resistant material surface can not form the protective layer, leads to main ditch resistant material to be corroded by high temperature easily, even adopt water-cooling, because of whole heat conduction is poor, can form the crackle in resistant material inside, makes front end resistant material corrode more easily, can not reach the due effect of water-cooling. Meanwhile, the refractory material and the binding agent are mixed and stirred and then poured automatically, so that the main channel refractory material is low in volume density, large in internal porosity and poor in mechanical scouring capacity of the anti-pricked molten iron.
Disclosure of Invention
In view of the above, the present invention provides a method for prolonging the service life of a main channel of a blast furnace, which can slow down or prevent the corrosion of refractory on the surface of the main channel, thereby prolonging the service life of the main channel of the blast furnace.
The invention provides a method for prolonging the service life of a blast furnace main channel, which comprises the following steps: the steel groove of the blast furnace main channel girder is internally provided with a lining, a microporous carbon brick layer and a cooling wall in sequence from the inside (hot surface) to the outside (cold surface), and the lining is a microporous corundum brick layer.
The invention adopts the microporous corundum as the main ditch lining, and the lining refractory material can not be corroded by the slag iron and can resist mechanical erosion. The lining refractory material can form self-protection, the temperature on the surface of the lining refractory material is reduced through the cooling wall, a layer of iron slag protective layer is formed on the surface of the lining refractory material, iron slag liquid is isolated from the iron slag liquid to avoid direct contact with the lining refractory material, the surface temperature of the lining refractory material is reduced, and meanwhile, mechanical scouring can be avoided. The whole system is smooth in heat transfer, and the influence on the service life caused by cracks generated inside the lining refractory material is avoided.
Preferably, the Al in the microporous corundum brick is calculated by mass percent2O3The content is more than 83 percent, SiO2The content is below 7 percent, and the iron slag can not be directly contacted with slag iron to generate chemical reaction with the slag iron and the iron, and can not be melted and damaged.
More preferably, the slag erosion resistance of the microporous corundum brick is less than or equal to 10 percent, the molten iron erosion resistance index is less than or equal to 1.5 percent, the pore diameter is less than or equal to 1.0 mu m, the pore volume fraction is more than or equal to 70 percent, and the volume density is 3.0-3.2 g/cm3. The microporous corundum is formed by pressing, has large volume density, few air holes, mechanical erosion resistance and excellent slag and iron corrosion resistance, so that the microporous corundum serving as the inner lining is more erosion resistant than the traditional main channel castable.
Preferably, the aperture of the microporous carbon brick is less than or equal to 1.0 mu m, the pore volume fraction of the microporous carbon brick less than 1 mu m is more than or equal to 70 percent, and the volume density is 1.68-1.69 g/cm3The microporous carbon brick has high heat conductivity, so that heat transmission is smooth, the surface temperature of the microporous corundum brick is reduced, a slag iron protective shell is formed, the corrosion of the microporous corundum brick is prevented, and the service life of a main ditch is prolonged.
Preferably, the thickness of the lining is 100-400 mm, the thickness of the microporous carbon brick layer is 400-700 mm, and the thickness of the cooling wall is 100-200 mm.
Preferably, the amount of cooling water in the cooling wall is adjusted to ensure that the surface temperature of the microporous corundum brick is lower than the solidifying point of the molten iron slag. Therefore, a slag iron shell is coagulated on the surface of the microporous corundum brick, the mechanical scouring of the microporous corundum brick by the slag iron liquid is avoided, and the slag iron erosion caused by the direct erosion of the slag iron liquid to the corundum brick is also prevented. More preferably, the amount of cooling water is adjusted to make the surface temperature of the microporous corundum brick lower than 1150 ℃.
Preferably, the corroded microporous corundum brick is removed after the microporous corundum brick layer is corroded, the microporous corundum brick is built again, and the slurry is used after being dried. Even if the corrosion of the microporous corundum bricks on the surface layer is finished, the microporous corundum bricks cannot be built for a certain reason, and the microporous carbon bricks on the outer layer have high heat-conducting property and slag iron corrosion resistance, so that the normal use of the main ditch can be guaranteed, and the repairing of the microporous corundum bricks can be waited for at opportunity.
Preferably, a galvanic couple is embedded between the microporous carbon brick layer and the microporous corundum brick layer to measure the hot surface temperature of the carbon brick, and a basis is provided for automatically adjusting the water quantity and overhauling the microporous corundum brick.
Preferably, the girder of the blast furnace main ditch is a prefabricated part, and a gap between the prefabricated part and the main ditch is blocked by adopting corundum material to automatically flow and pour. Avoiding the slag liquid from entering the hot metal ladle from the gap.
According to the second aspect of the invention, the blast furnace main runner built by adopting the method for prolonging the service life of the blast furnace main runner is provided, and the schematic section view of the blast furnace main runner is shown as attached figure 1.
Compared with the prior art, the invention has the beneficial effects that:
the invention prevents the slag iron liquid from directly scouring and eroding the microporous corundum bricks by forming the slag iron protective layer on the surface of the lining, thereby slowing the erosion of the microporous corundum bricks, realizing the long service life of the main runner, and having convenient maintenance, short maintenance time and less influence on tapping organization and furnace condition. The long-life technology of the blast furnace main channel provided by the invention only needs to increase the investment of the cooling wall, the microporous carbon brick and the corundum once, has lower cost, can save the investment of a spare taphole, saves refractory materials, can also reduce the investment of the spare taphole, the main channel and corresponding equipment such as a clay gun, a tapping machine and the like, and has strong practicability.
Drawings
FIG. 1 is a schematic cross-sectional view of a main blast furnace runner constructed by the method for prolonging the service life of the main blast furnace runner according to the present invention.
Wherein, 1 is a main channel steel groove, 2 is a cooling wall, 3 is a microporous carbon brick layer, and 4 is a lining.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited to the following specific examples.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The invention provides a method for prolonging the service life of a blast furnace main channel, which comprises the following steps: the steel channel of the blast furnace main channel girder is internally and sequentially provided with a lining with the thickness of 100-400 mm, a microporous carbon brick layer with the thickness of 400-700 mm and a cooling wall with the thickness of 100-200 mm from inside to outside, wherein the lining is a microporous corundum brick layer. By mass percentage, Al in the microporous corundum brick2O3The content is more than 83 percent, SiO2The content is less than 7 percent, the slag erosion resistance of the microporous corundum brick is less than or equal to 10 percent, the molten iron erosion resistance index is less than or equal to 1.5 percent, the aperture is less than or equal to 1.0 mu m, the pore volume rate is more than or equal to 70 percent, and the volume density is 3.2g/cm3. The aperture of the microporous carbon brick is less than or equal to 1.0 mu m, the volume fraction of pores less than 1 mu m is more than or equal to 70 percent, and the volume density is 1.68-1.69 g/cm3. The blast furnace main ditch girder is a prefabricated part, and a gap between the prefabricated part and the main ditch is blocked by adopting corundum material to automatically flow and pour. And a galvanic couple is embedded between the microporous carbon brick layer and the microporous corundum brick layer to measure the hot surface temperature of the carbon brick, and the cooling water amount in the cooling wall is adjusted to ensure that the surface temperature of the microporous corundum brick is lower than the solidification point of molten iron slag 1150 ℃ in the using process. And after the micro-pore corundum brick layer is corroded, the corroded micro-pore corundum brick can be removed and rebuilt, and the micro-pore corundum brick can be used after the slurry is dried.
The method for prolonging the service life of the blast furnace main channel is described in detail with reference to the specific embodiment.
Example 1
The embodiment provides a method for prolonging the service life of a blast furnace main channel, which comprises the following steps:
and firstly paving a cooling wall with the thickness of 120mm on the inner wall and the bottom of the steel groove of the blast furnace main channel, and then sequentially building an ultramicropore carbon brick layer with the thickness of 500mm and a micropore corundum brick layer with the thickness of 380mm as an inner lining. And a galvanic couple is embedded between the microporous carbon brick layer and the microporous corundum brick layer to measure the hot surface temperature of the carbon brick. The blast furnace main ditch girder is changed into a prefabricated member, when the lining is built, the main ditch girder is transversely placed, and two ends of the main ditch girder are embedded into the lining to form the slag stopper.
By mass percentage, Al in the microporous corundum brick2O385% of SiO2The content is 6 percent, the slag erosion resistance of the microporous corundum brick is less than or equal to 10 percent, the molten iron erosion resistance index is less than or equal to 1.5 percent, the pore diameter is less than or equal to 1.0 mu m, the pore volume rate is more than or equal to 70 percent, and the volume density is 3.2g/cm3. The aperture of the microporous carbon brick is less than or equal to 1.0 mu m, the volume fraction of pores less than 1 mu m is more than or equal to 80 percent, and the volume density is 1.69g/cm3
After the construction is finished, the moisture of the dried slurry is put into use, in the using process, the cooling water amount in the cooling wall is adjusted, the high heat-conducting property of the microporous carbon brick and the cooling wall system enable heat transmission to be smooth, the surface temperature of the microporous corundum brick is enabled to be lower than the solidifying point of molten iron slag to be 1150 ℃, the surface of the microporous corundum brick is solidified with an iron slag shell, the special corrosion of the microporous corundum is prevented, and the service life of the main ditch is prolonged.
After the prefabricated member is used for a period of time, when the girder is corroded or the sand mouth is over-slagged, the old girder is hung, a new girder is arranged, and the corundum material is adopted to automatically flow to pour and block the gap between the prefabricated member and the main ditch. When the micro-porous corundum bricks are corroded, the original micro-porous corundum bricks can be removed and built again, and the dried slurry can be put into use again after moisture. The microporous corundum bricks can not be built for some reasons, and even if the microporous corundum bricks on the surface layer are corroded, the microporous carbon bricks on the outer layer have high heat-conducting property and slag iron corrosion resistance, so that the normal use of the main ditch can be guaranteed, and the opportunity of building the microporous corundum bricks for repair can be waited.
The investment of the cooling wall, the microporous carbon brick and the corundum is increased at one time according to the method, the investment of a spare taphole is saved, about 140 tons of refractory materials are saved, and the investment of the spare taphole, a main channel, corresponding mud guns, tapping machines and other equipment can be reduced. Each main ditch reduces 9 times of pouring per year, reduces about 540 tons of refractory materials, reduces the baking gas consumption of the main ditches by 20000m3270 tons of solid waste is reduced, 360 ten thousand yuan can be saved, the cost of circulating water is increased by 52.5 ten thousand yuan, and the benefit is created by 307.5 ten thousand yuan. The large-scale blast furnace uses at least two main ditches, and can generate 615 ten thousand yuan.
Example 2
The embodiment provides a method for prolonging the service life of a blast furnace main channel, which comprises the following steps:
a blast furnace main channel girder is changed into a prefabricated member, a cooling wall with the thickness of 125mm is firstly paved on the inner wall and the bottom of a steel groove of the blast furnace main channel girder, and then a microporous carbon brick layer with the thickness of 475mm and a microporous corundum brick layer with the thickness of 400mm as a lining are sequentially built. And (3) automatically pouring corundum materials to block the gap between the prefabricated part and the main channel.
By mass percentage, Al in the microporous corundum brick2O383% of SiO2The content is 7 percent, the slag erosion resistance of the microporous corundum brick is less than or equal to 10 percent, the molten iron erosion resistance index is less than or equal to 1.5 percent, the pore diameter is less than or equal to 1.0 mu m, the pore volume rate is more than or equal to 70 percent, and the volume density is 3.2g/cm3. The aperture of the microporous carbon brick is less than or equal to 1.0 mu m, the volume fraction of pores less than 1 mu m is more than or equal to 70 percent, and the volume density is 1.68g/cm3
After the construction is finished, the moisture of the dried slurry is put into use, in the using process, the cooling water amount in the cooling wall is adjusted, the high heat-conducting property of the microporous carbon brick and the cooling wall system enable heat transmission to be smooth, the surface temperature of the microporous corundum brick is lower than the solidifying point of the molten iron slag, the iron slag shell is solidified on the surface of the microporous corundum brick, the special corrosion of microporous corundum is prevented, and the service life of the main ditch is prolonged.
After the micro-porous corundum bricks are used for a period of time, the original micro-porous corundum bricks are removed and built again, and the dried slurry is put into use. The microporous corundum bricks can not be built for some reasons, and even if the microporous corundum bricks on the surface layer are corroded, the microporous carbon bricks on the outer layer have high heat-conducting property and slag iron corrosion resistance, so that the normal use of the main ditch can be guaranteed, and the opportunity of building the microporous corundum bricks for repair can be waited.
The effect of prolonging the service life of the main ditch is basically consistent with that of the embodiment 1 when the method is put into production and used.
Example 3
The embodiment provides a method for prolonging the service life of a blast furnace main channel, which comprises the following steps:
a blast furnace main channel girder is changed into a prefabricated member, a cooling wall with the thickness of 140mm is laid on the inner wall and the bottom of a steel groove of the blast furnace main channel girder, and then a microporous carbon brick layer with the thickness of 500mm and a microporous corundum brick layer with the thickness of 350mm as a lining are sequentially built. And (3) automatically pouring corundum materials to block the gap between the prefabricated part and the main channel.
By mass percentage, Al in the microporous corundum brick2O383% of SiO2The content is 5 percent, the slag erosion resistance of the microporous corundum brick is less than or equal to 10 percent, the molten iron erosion resistance index is less than or equal to 1.5 percent, the pore diameter is less than or equal to 1.0 mu m, the pore volume rate is more than or equal to 70 percent, and the volume density is 3.2g/cm3. The aperture of the microporous carbon brick is less than or equal to 1.0 mu m, the volume fraction of pores less than 1 mu m is more than or equal to 70 percent, and the volume density is 1.68g/cm3
After the construction is finished, the dried slurry is used, in the using process, the cooling water amount in the cooling wall is adjusted, the heat transmission is smooth due to the high heat-conducting property of the microporous carbon brick and the cooling wall system, the surface temperature of the microporous corundum brick is lower than the solidifying point of the molten iron slag, the iron slag shell is solidified on the surface of the microporous corundum brick, the special corrosion of the microporous corundum is reduced, and the service life of the main ditch is prolonged.
After the brick is used for a period of time, the microporous corundum brick is corroded, the original microporous corundum brick can be removed and built again, and the dried mud can be put into use again after moisture. The microporous corundum bricks can not be built for some reasons, and even if the microporous corundum bricks on the surface layer are corroded, the microporous carbon bricks on the outer layer have high heat-conducting property and slag iron corrosion resistance, so that the normal use of the main ditch can be guaranteed, and the opportunity of building the microporous corundum bricks for repair can be waited.
The effect of prolonging the service life of the main ditch is basically consistent with that of the embodiment 1 when the method is put into production and used.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (2)

1. A method for prolonging the service life of a blast furnace main channel comprises the following steps: changing a blast furnace main channel girder into a prefabricated member, paving a cooling wall with the thickness of 100-200 mm on the inner wall and the bottom of a steel channel of the blast furnace main channel girder, then sequentially building a microporous carbon brick layer with the thickness of 400-700 mm and a microporous corundum brick layer with the thickness of 100-400 mm as an inner lining, transversely placing the main channel girder when building the inner lining, embedding two ends of the main channel girder into the inner lining to form a slag stopper, automatically pouring corundum materials to block a gap between the prefabricated member and the main channel, and embedding a galvanic couple between the microporous carbon brick layer and the microporous corundum brick layer, wherein the Al in the microporous corundum brick is calculated by mass percentage2O3The content is more than 83 percent, SiO2The content is less than 7 percent, the slag erosion resistance of the microporous corundum brick is less than or equal to 10 percent, the molten iron erosion resistance index is less than or equal to 1.5 percent, the pore diameter is less than or equal to 1.0 mu m, and the volume density is 3.0-3.2 g/cm3The aperture of the microporous carbon brick is less than or equal to 1.0 mu m, and the volume density is 1.68-1.69 g/cm3Adjusting the amount of cooling water in the cooling wall to a minimumThe surface temperature of the porous corundum brick is lower than the solidifying point of the slag iron liquid, the corroded microporous corundum brick is removed after the microporous corundum brick layer is corroded, the microporous corundum brick is built again, and the slurry is used after being dried.
2. The blast furnace main trench which is built by adopting the method for prolonging the service life of the blast furnace main trench as claimed in claim 1.
CN201811515586.XA 2018-12-12 2018-12-12 Method for prolonging service life of blast furnace main channel Active CN109439825B (en)

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Publication number Priority date Publication date Assignee Title
CN103936443A (en) * 2014-04-03 2014-07-23 巩义市第五耐火材料总厂 Novel micropore corundum brick and preparation method thereof
CN207016810U (en) * 2017-06-21 2018-02-16 蒋睿 One kind cooling wall type blast furnace iron/slag runner
CN108998607A (en) * 2018-10-15 2018-12-14 中冶赛迪技术研究中心有限公司 A kind of blast furnace iron outlet groove cooling device

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