CN216513933U - Long-life central choke of blast furnace airtight box - Google Patents
Long-life central choke of blast furnace airtight box Download PDFInfo
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- CN216513933U CN216513933U CN202220021367.1U CN202220021367U CN216513933U CN 216513933 U CN216513933 U CN 216513933U CN 202220021367 U CN202220021367 U CN 202220021367U CN 216513933 U CN216513933 U CN 216513933U
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- pipe body
- lining plate
- blast furnace
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- ceramic lining
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- 239000000919 ceramic Substances 0.000 claims abstract description 56
- 239000002994 raw material Substances 0.000 abstract description 12
- 238000002679 ablation Methods 0.000 abstract description 10
- 238000009792 diffusion process Methods 0.000 abstract description 8
- 239000002245 particle Substances 0.000 abstract description 6
- 230000003628 erosive effect Effects 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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Abstract
The utility model relates to a long-life central throat pipe of a blast furnace airtight box, which comprises a pipe body, wherein a wear-resistant layer is arranged at the upper part of the inner wall of the pipe body, a ceramic lining plate is arranged at the lower part of the inner wall of the pipe body, the ceramic lining plate is fixedly connected with the pipe body through a fastening bolt, a counter bore matched with the fastening bolt is formed in the ceramic lining plate, and the axial direction of the counter bore is consistent with the radial direction of the pipe body. According to the utility model, the ceramic lining plate is arranged in the pipe body, so that the impact resistance, wear resistance and high-temperature ablation resistance of the central throat pipe are improved, the ceramic lining plate is fixed by the bolt, the use cost is reduced, the repair utilization rate of spare parts is improved, the problems of poor ablation resistance and poor impact wear resistance of the existing central throat pipe under the conditions of long-term diffusion impact wear of free falling particle flow of iron-making raw materials and high-temperature erosion of the furnace top are solved, the service cycle of the central throat pipe is prolonged, the cost of spare parts is reduced, and the long-period, low-cost and stable operation requirements of a large blast furnace are met.
Description
Technical Field
The utility model relates to the technical field of furnace top equipment of an iron-making blast furnace, in particular to a long-life central throat pipe of a blast furnace airtight box.
Background
The central throat pipe is installed inside the airtight box and fixed by a support ring welded on the airtight box body, and the common structure of the existing central throat pipe body is mainly formed by welding a fixed ring platform, an upper conical shell, a straight-section shell and a lower closed ring. In the production of a serial tank and a bell-less top blast furnace, the central throat is used as the only passage from the charging bucket to the distribution chute, and the main function is to effectively isolate the ironmaking raw materials from the inner shell of the airtight box in the charging process, prevent air leakage and internal gear structural damage caused by wearing of the airtight box, and ensure that the transmission distribution chute of the airtight box completes the uniform distribution of the ironmaking raw materials.
The central choke of a blast furnace roof equipment that china utility model 207347586U patent disclosed, the central choke of a combination quick change formula that china utility model 2518868Y patent disclosed, this two kinds of central chokes are because of receiving the diffusion impact wear and the erosion of furnace roof high temperature that ironmaking raw materials free fall granule flows for a long time, show following problem in production practice: firstly, over one third of the length of the bottom of the straight section (including the conical shell) almost has no abrasion due to the centering regulation effect of the receiving chute arranged at the upper part of the central throat pipe on the free falling raw material particle flow; secondly, the lower closed ring is ablated and damaged until falling off; thirdly, the wear-resistant layer at the circumference of the straight section below one third of the bottom part drops in a point shape, and the wear-resistant layer at the circumference of the straight section below one fifth of the bottom part drops in a large area; and fourthly, abrasion, ablation damage and the like occur at the part where the bottom of the straight section is connected with the lower closed ring. The problems not only shorten the service life of the central throat pipe, but also influence the rotary material distribution of the airtight box, cause unstable furnace conditions of the blast furnace and seriously restrict the production stability of the blast furnace.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides the long-life central throat pipe of the blast furnace airtight box, solves the problems of ablation resistance, poor impact wear resistance, short service cycle and the like of the conventional central throat pipe under the condition of long-term diffusion impact wear of free falling particle flow of ironmaking raw materials and high-temperature corrosion of the furnace top, and meets the long-term stable operation requirement of a large blast furnace.
The utility model is realized by the following technical scheme, and provides a long-life central throat pipe of a blast furnace airtight box, which comprises a pipe body, wherein a wear-resistant layer is arranged at the upper part of the inner wall of the pipe body, a ceramic lining plate is arranged at the lower part of the inner wall of the pipe body, the ceramic lining plate is fixedly connected with the pipe body through a fastening bolt, a counter bore matched with the fastening bolt is formed in the ceramic lining plate, and the axial direction of the counter bore is consistent with the radial direction of the pipe body.
According to the scheme, the wear-resistant layer is arranged on the upper part of the inner wall of the tube body, so that the wear-resistant capacity of the upper part of the tube body is improved, and the ceramic lining plate is arranged on the lower part of the inner wall of the tube body and is used for bearing impact formed by divergent diffusion of raw material particle flow at the bottom of the central throat tube and high-temperature radiation, so that impact abrasion and high-temperature ablation of the tube body are avoided; the ceramic lining plate is connected with the pipe body through the fastening bolt, so that the ceramic lining plate is convenient to replace, the use cost is reduced, and the abrasion of materials to the bolt cap is reduced by arranging the counter bores.
As an optimization, the end, far away from the pipe body, of the counter bore is provided with an internal thread, the inside of the counter bore is connected with a ceramic protecting cover through the internal thread, and a bolt cap of the fastening bolt is located between the bottom of the counter bore and the ceramic protecting cover. This optimization scheme is through setting up ceramic protecting cover, forms the protection to the bolt cap, avoids the bolt cap to be worn and torn by the material, and ceramic protecting cover passes through threaded connection with ceramic welt, the dismantlement of the ceramic protecting cover of being convenient for.
Preferably, the ceramic lining plate comprises a plurality of sections of lining plate units distributed along the circumferential direction. According to the optimization scheme, the ceramic lining plate is divided into the plurality of mutually independent lining plate units, so that the production difficulty and the installation difficulty of the ceramic lining plate are reduced.
As optimization, the ceramic lining plate comprises a vertical part fixedly connected with the pipe body and a radial part extending outwards from the lower end of the vertical part, and a sinking groove matched with the lower end of the pipe body is formed in the upper surface of the radial part. This optimization scheme has realized the protection to the closed ring of body lower extreme through setting up radial portion and heavy groove to avoid closed ring to be worn and torn down, the convenient radial positioning to ceramic welt simultaneously is convenient for improve the installation effectiveness of ceramic welt.
As optimization, the total length of the ceramic lining plate is 1/3-1/2 of the length of the straight section of the pipe body, the length of the ceramic lining plate is set according to the optimization scheme, and the ceramic lining plate is matched with the blanking contour line of blast furnace ironmaking raw materials, so that the abrasion resistance and ablation resistance reliability of the pipe body are improved.
The utility model has the beneficial effects that: through set up the ceramic welt in the body is inside, the shock resistance of central choke, wear resistance and high temperature ablation resistance have been improved, the ceramic welt sets up to the bolt fastening, use cost is reduced, spare part is repaired old utilization ratio has been improved, the problem that current central choke is anti ablation under the diffusion impact wear and the erosion of furnace roof high temperature under the diffusion impact wear that receives ironmaking raw materials free fall granule stream for a long time, impact wear resistance is poor has been solved, the life cycle of central choke has been prolonged, spare part cost has been reduced, the long period of big blast furnace has been satisfied, low cost, the steady operation requirement.
Drawings
FIG. 1 is a schematic view of the structure of a central throat tube according to the present invention;
FIG. 2 is a schematic structural view of a ceramic liner plate;
FIG. 3 is a schematic view of a ceramic cover structure;
FIG. 4 is a cross-sectional view of a ceramic cover;
shown in the figure:
1. the device comprises a fixed ring platform, 2 parts of an upper conical shell, 3 parts of a straight-section shell, 4 parts of a lower sealing ring, 5 parts of a wear-resistant layer, 6 parts of a ceramic lining plate, 7 parts of a fastening bolt, 8 parts of a ceramic protecting cover, 9 parts of a straight groove.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.
As shown in fig. 1, the long-life central throat pipe of the blast furnace airtight box comprises a pipe body, wherein the pipe body comprises a fixed ring platform 1, an upper conical shell 2, a straight shell 3 and a lower closed ring 4 which are sequentially and coaxially welded along the vertical direction, the upper part of the inner wall of the pipe body is provided with a wear-resistant layer 5, and the wear-resistant layer of the embodiment is a surfacing hard alloy layer or a spraying wear-resistant alloy or a welding combined wear-resistant lining plate group.
The lower part of body inner wall is equipped with ceramic welt 6, and the lower part of the fixed straight section casing of ceramic welt of this embodiment, ceramic welt extend downwards from the lower terminal surface of wearing layer, and ceramic welt passes through fastening bolt 7 and body rigid coupling, ceramic welt on seted up with the counter bore of fastening bolt adaptation, the axial of counter bore is radially unanimous with the body, and fastening bolt's screw rod outwards passes through the body lateral wall from the counter bore, and fastening bolt's bolt head is arranged in the counter bore. The length of the ceramic lining plate is related to the diameter of the central throat pipe and the blanking outline of the blast furnace ironmaking raw material, the actual wear length of the original central throat pipe is taken as a reference, and the total length of the ceramic lining plate is 1/3-1/2 of the length of the straight section of the pipe body.
In order to protect the bolt cap of the fastening bolt, an internal thread is arranged at one end, away from the pipe body, of the counter bore, a ceramic protecting cover 8 is connected into the counter bore through the internal thread, and the bolt cap of the fastening bolt is located between the bottom of the counter bore and the ceramic protecting cover. As shown in fig. 4, a straight groove 9 is arranged on the side surface of the ceramic protecting cover far away from the fastening bolt, so that the ceramic protecting cover can be screwed by using a tool conveniently.
The ceramic lining board comprises a plurality of lining board units distributed along the circumferential direction, the number of the lining board units in the embodiment is eight, the lining board units are uniformly distributed along the circumferential direction of the pipe body, and the ceramic lining board can also be divided into equal other block numbers by combining the production requirements and the processing cost.
The ceramic welt is "L" shape, and is concrete, the ceramic welt include with the vertical portion of body rigid coupling to and the radial portion of the radial outside extension of lower extreme along the body of vertical portion, vertical portion and radial portion formula structure as an organic whole, vertical portion passes through fastening bolt and the straight section casing rigid coupling of body, the upper surface of radial portion be equipped with the heavy groove of body lower extreme adaptation, lower closed ring 4 is arranged in heavy groove, forms the protection to lower closed ring through radial portion, avoids wearing and tearing and high temperature ablation.
Bell-less series-tank blast furnace charging bucket applications are described below. In the production process of the blast furnace, the lower sealing valve is opened, and a batch of raw materials freely fall onto the receiving chute through the material flow regulating valve and then freely fall into the central throat pipe after passing through the middle of the receiving chute. According to the diffusion characteristic of the free falling particle flow and the recoil action of the airflow in the furnace at the temperature of more than 300 ℃, the raw material particle flow is subjected to diffusion at the bottom of the central throat pipe, and the inner surface of the central throat pipe is subjected to impact friction and high-temperature erosion. The ceramic lining plate assembled on the lower part of the central throat pipe body is just used for bearing the impact and the high-temperature radiation, so that the central throat pipe body is prevented from being damaged, the problems of impact abrasion and high-temperature ablation are solved, and the service life of the central throat pipe is effectively prolonged.
Of course, the above description is not limited to the above examples, and the undescribed technical features of the present invention can be implemented by or using the prior art, and will not be described herein again; the above embodiments and drawings are only for illustrating the technical solutions of the present invention and not for limiting the present invention, and the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that changes, modifications, additions or substitutions within the spirit and scope of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and shall also fall within the scope of the claims of the present invention.
Claims (5)
1. The utility model provides a blast furnace airtight box's long-life center choke, includes the body, its characterized in that: the pipe body is characterized in that a wear-resistant layer (5) is arranged on the upper portion of the inner wall of the pipe body, a ceramic lining plate (6) is arranged on the lower portion of the inner wall of the pipe body and fixedly connected with the pipe body through a fastening bolt (7), a counter bore matched with the fastening bolt is formed in the ceramic lining plate, and the axial direction of the counter bore is consistent with the radial direction of the pipe body.
2. The long life central throat of a blast furnace gas-tight box of claim 1, wherein: the one end that the body was kept away from to the counter bore is equipped with the internal thread, passes through in the counter bore there is ceramic protecting cover (8), and fastening bolt's bolt cap is located between counter bore hole bottom and the ceramic protecting cover.
3. The long life central throat of a blast furnace gas-tight box of claim 1, wherein: the ceramic lining plate comprises a plurality of sections of lining plate units distributed along the circumferential direction.
4. The long life central throat of a blast furnace gas-tight box of claim 1, wherein: the ceramic lining plate comprises a vertical part fixedly connected with the pipe body and a radial part extending outwards from the lower end of the vertical part, and the upper surface of the radial part is provided with a sinking groove matched with the lower end of the pipe body.
5. The long-life central throat of a blast furnace airtight box according to any one of claims 1 to 4, characterized in that: the total length of the ceramic lining plate is 1/3-1/2 of the length of the straight section of the pipe body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220021367.1U CN216513933U (en) | 2022-01-06 | 2022-01-06 | Long-life central choke of blast furnace airtight box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220021367.1U CN216513933U (en) | 2022-01-06 | 2022-01-06 | Long-life central choke of blast furnace airtight box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216513933U true CN216513933U (en) | 2022-05-13 |
Family
ID=81517195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220021367.1U Expired - Fee Related CN216513933U (en) | 2022-01-06 | 2022-01-06 | Long-life central choke of blast furnace airtight box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216513933U (en) |
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2022
- 2022-01-06 CN CN202220021367.1U patent/CN216513933U/en not_active Expired - Fee Related
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Granted publication date: 20220513 |