CN112831620A - Cooling wall structure - Google Patents
Cooling wall structure Download PDFInfo
- Publication number
- CN112831620A CN112831620A CN201911154419.1A CN201911154419A CN112831620A CN 112831620 A CN112831620 A CN 112831620A CN 201911154419 A CN201911154419 A CN 201911154419A CN 112831620 A CN112831620 A CN 112831620A
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- CN
- China
- Prior art keywords
- stave
- cooling wall
- cooling
- blast furnace
- hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000001816 cooling Methods 0.000 title claims abstract description 74
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 28
- 229910052802 copper Inorganic materials 0.000 claims description 28
- 239000010949 copper Substances 0.000 claims description 28
- 239000011449 brick Substances 0.000 claims description 10
- 229910001018 Cast iron Inorganic materials 0.000 claims description 7
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 210000001015 abdomen Anatomy 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
Abstract
The invention provides a cooling wall structure, which belongs to the technical field of ferrous metallurgy and is arranged on the inner wall surface of a blast furnace shell, wherein the cooling wall structure comprises a first cooling wall and a second cooling wall with different heat conduction coefficients, the first cooling wall is positioned above the second cooling wall, and the bottom edge of the hot surface of the first cooling wall and the top edge of the hot surface of the second cooling wall have a retraction interval in the horizontal direction. The cooling wall structure provided by the invention can realize smooth inner shape in actual operation after the cooling wall slag crust is formed, and is beneficial to blast furnace production. Meanwhile, the whole cooling equipment can be effectively protected, and the service life of the blast furnace can be prolonged.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a cooling wall structure.
Background
In the smelting process of the blast furnace, the furnace belly, the furnace waist and the lower part of the furnace body carry out complex physical and chemical reactions, the working condition is severe, the heat flow intensity is high, and the copper cooling wall taking the rolled copper plate as the body has high cooling intensity, so that the copper cooling wall is widely applied to the furnace belly, the furnace waist and the lower part of the furnace body of the large and medium-sized blast furnace. However, the copper cooling wall does not achieve the expected effect through the use of the copper cooling wall in recent years, and the copper cooling wall is damaged when part of the blast furnace is produced for several years. The high investment does not bring long-term benefits, potential safety hazards are brought to blast furnace production, and meanwhile, the production cost is increased.
Through the damage investigation discovery to some blast furnace copper cooling walls, adopt the shaft structure that copper cooling wall hot side and top cast iron or cast steel cooling wall hot side align, there is the condition of wearing and tearing leaking on the copper cooling wall body of shaft lower part, through the analysis, because cast iron or cast steel cooling wall thermal conductivity of its top is relatively poor, the cooling wall hot side is difficult to form the cinder, consequently, the hot side of cooling wall is easily washed away and is worn and torn by high temperature coal gas, furnace charge etc. easily, this will be with the copper cooling wall body upper edge of below expose in the stove, the furnace charge that descends can frequently rub to it, and the copper product matter is softer, finally lead to edge wearing and tearing to leak on the copper cooling wall. In addition, in the production process, because the copper cooling wall and the cast iron or cast steel cooling wall have different heat conduction properties and have large difference in cooling strength, the thickness of slag skin formed on the hot surface of the cooling wall is different, so that the internal shape of the blast furnace is not smooth in actual operation, the rising of coal gas and the falling of furnace burden are influenced to a certain extent, and the fuel consumption of the blast furnace cannot reach the optimum.
The blast furnace shell is of a cylindrical structure, a cambered surface structure can be cast by adopting cast iron or cast steel cooling walls in a casting process according to requirements, and a smooth inner shape can be kept after the upper and lower sections of cooling walls are installed in a staggered joint mode. The copper cooling wall body adopted at present is a rolled copper plate, a cooling channel is manufactured on the copper plate through a drilling process, and then a water pipe is welded outside and connected with the channel. The rolling process of the copper cooling wall determines that the copper cooling wall can only be in a flat plate structure, and a section of the copper cooling wall is actually a polygon similar to a circle after being installed. In general design, in order to avoid forming a vertical through seam between the upper cooling wall and the lower cooling wall, the arrangement mode of staggering half cooling walls is adopted, and triangular seams formed in installation are not considered. Therefore, once the slag crust falls off in the production process, the descending furnace charge and the ascending high-temperature gas flow can cause scouring damage to the body. The proportion of damage caused by scouring is large in the investigation of the damage of the copper cooling wall.
Therefore, how to adopt a reasonable copper cooling wall structure system to prolong the service life of the copper cooling wall and further achieve the long service life of the furnace body is urgently needed.
Disclosure of Invention
The invention aims to provide a cooling wall structure which can realize smooth inner shape in actual operation after cooling wall slag crust is formed and is beneficial to blast furnace production. Meanwhile, the whole cooling equipment can be effectively protected, and the service life of the blast furnace can be prolonged.
In order to achieve the above object, the present invention provides a stave structure disposed on an inner wall surface of a furnace shell of a blast furnace, wherein the stave structure comprises a first stave and a second stave having different thermal conductivities, the first stave is located above the second stave, and a bottom edge of a hot surface of the first stave and a top edge of a hot surface of the second stave have a retraction interval in a horizontal direction.
The stave structure of the above, wherein the hot side of the first stave is covered with a first insert, and the hot side of the second stave is covered with a second insert, and the bottom edge of the hot side of the first insert is flush with the top edge of the hot side of the second insert.
The stave structure described above wherein the first stave has a thermal conductivity less than that of the second stave, and wherein a bottom edge of the hot face of the first stave protrudes inwardly from a top edge of the hot face of the second stave.
The stave structure comprises a plurality of second cooling sections sequentially arranged from top to bottom, each second cooling section is formed by sequentially arranging a plurality of second stave bodies along the circumferential direction of the blast furnace shell, and a second expansion joint vertically arranged is arranged between every two adjacent second stave bodies.
The stave structure described above wherein two of said second expansion gaps adjacent above and below are provided in alignment.
The stave structure described above, wherein two of the second expansion joints adjacent to each other above and below are disposed in a staggered manner, and a staggered distance between the two expansion joints is smaller than a width of the second expansion joint.
The stave structure described above wherein the second stave body has a flat plate shape.
The stave structure described above wherein the first stave is a cast iron stave or a cast steel stave.
The stave structure described above wherein the second stave is a copper stave.
The stave structure described above, wherein the second stave is a composite stave, and a hot surface of the composite stave is made of a copper material.
Compared with the prior art, the invention has the following characteristics and advantages:
according to the cooling wall structure provided by the invention, through the preset retraction interval between the bottom edge of the hot surface of the first cooling wall and the top edge of the hot surface of the second cooling wall, the slag crust at the bottom edge of the first cooling wall and the slag crust at the top edge of the second cooling wall can be in smooth transition although the thicknesses of the slag crust and the slag crust are different, namely, the actual operation inner shape of the whole cooling wall structure after the slag crust is formed is smooth, the effect of facilitating the production of a blast furnace is achieved, and the operation index of the blast furnace is further improved; meanwhile, the whole cooling equipment can be effectively protected, and the service life of the blast furnace can be prolonged.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.
FIG. 1 is a schematic view of a stave structure proposed by the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at I;
FIG. 3 is a comparison of the stave construction proposed by the present invention with the prior art;
FIG. 4 is an enlarged view of a portion of FIG. 3 at III;
FIG. 5 is an enlarged view of a portion of FIG. 3 at IV;
FIG. 6 is a view showing the structure of a stave according to the present invention;
fig. 7 is a partial enlarged view of the point ii in fig. 6.
Description of reference numerals:
100. a stave structure; 10. A first stave;
11. a first stave body; 12. A first expansion joint;
20. a second stave; 21. A second stave body;
22. a second expansion joint; 23. A second cooling section;
30. a first inlaid brick; 40. A second inlaid brick;
l1, setback interval; l2, offset distance;
200. a blast furnace shell; o, the center line of the blast furnace;
300. and (4) inner molded lines.
Detailed Description
The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.
As shown in fig. 1 and fig. 2, the present invention provides a stave structure 100 disposed on an inner wall of a furnace shell 200 of a blast furnace, wherein the stave structure 100 comprises a first stave 10 and a second stave 20 having different thermal conductivities, the first stave 10 is located above the second stave 20, and a bottom edge of a hot surface of the first stave 10 and a top edge of a hot surface of the second stave 20 have a setback interval L1 in a horizontal direction. The hot surface of the first stave 10 is covered with a first mosaic tile 30, the hot surface of the second stave 20 is covered with a second mosaic tile 40, and the bottom edge of the hot surface of the first mosaic tile 30 is flush with the top edge of the hot surface of the second mosaic tile 40.
In the present invention, the surfaces of the first stave 10 and the second stave 20 facing the blast furnace center line O are hot surfaces, and the surfaces of the first stave 10 and the second stave 20 facing the shell of the blast furnace are cold surfaces.
The stave structure 100 provided by the invention comprises a first stave 10 and a second stave 20, wherein the first stave 10 and the second stave 20 have different thermal conductivity coefficients and different cooling strengths, so that the first stave 10 and the second stave 20 can form different thicknesses of slag crust during the production of a blast furnace, and the slag crust at the bottom edge of the first stave 10 and the slag crust at the top edge of the second stave 20 can be smoothly transited though having different thicknesses through a preset retraction interval L1 between the bottom edge of the hot surface of the first stave 10 and the top edge of the hot surface of the second stave 20, namely, the actual operation inner shape of the whole stave structure 100 after the formation of the slag crust can be smooth, the blast furnace production effect is facilitated, and further the blast furnace operation index is improved; meanwhile, the whole cooling equipment can be effectively protected, and the production operation is facilitated.
In an alternative example of the present invention, the thermal conductivity of the first stave cooler 10 is smaller than that of the second stave cooler 20, and the bottom edge of the hot surface of the first stave cooler 10 protrudes inward from the top edge of the hot surface of the second stave cooler 20. Specifically, the first stave 10 has a relatively low thermal conductivity and a relatively low cooling strength, and the formation speed of the slag crust is relatively slow, while the hot surface of the first stave 10 is easily worn without the protection of the slag crust, so that the first stave 10 is thinned, and by means of the method of retracting the first stave 10 above the hot surface of the second stave 20 by a certain distance from the bottom edge of the hot surface of the first stave 10 to the inside (toward the center line O of the blast furnace) to the top edge of the hot surface of the second stave 20, the situation that the second stave 20 is protruded due to the wear and thinning of the lower part of the first stave 10 and is worn by the descending furnace burden after the blast furnace is produced for a certain period of time can be avoided, so that the second stave 20 can be effectively protected, thereby prolonging the service life of the blast furnace.
In an alternative example of the present invention, the hot side of the first stave 10 is covered with a first brick 30, the hot side of the second stave 20 is covered with a second brick 40, and the bottom edge of the hot side of the first brick 30 is flush with the top edge of the hot side of the second brick 40, so as to ensure smooth inner shape in the actual operation in the early stage of the blast furnace production.
In an alternative example of the present invention, as shown in fig. 3 to 7, the second stave 20 comprises a plurality of second cooling sections 23 sequentially arranged from top to bottom, each second cooling section 23 is formed by a plurality of second stave bodies 21 sequentially arranged along a circumferential direction of the blast furnace shell 200, and a second expansion joint 22 vertically arranged is provided between two adjacent second stave bodies 21.
In an alternative example of the present invention, two second expansion gaps 22 adjacent to each other up and down are aligned.
In another alternative example of the present invention, as shown in fig. 6 and 7, the two second expansion joints 22 adjacent to each other up and down are arranged in a staggered manner, and the offset distance L2 between the two second expansion joints 22 is smaller than the width of the second expansion joint 22 (i.e. the two second expansion joints 22 adjacent to each other up and down are arranged slightly in a staggered manner).
In an alternative example of the present invention, the second stave body 21 is flat.
Referring to fig. 3, fig. 3 is a comparison diagram of the stave structure proposed by the present invention and the prior art, wherein the left side of fig. 3 is the prior art, and the right side of fig. 3 is the stave structure proposed by the present invention, as shown in fig. 3 and fig. 4, in the prior art, the length of a half stave body 81 is staggered between an upper stave 80 and a lower stave 80 to generate a triangular seam 90, in the present invention, as shown in fig. 5, two adjacent upper and lower second expansion seams 22 are aligned or slightly staggered to avoid the triangular seam between the upper and lower second cooling sections, thereby avoiding the washout damage of the second staves 20 caused by the coal gas or the furnace burden in the blast furnace production, and prolonging the service life of the second staves 20.
In an alternative example of the present invention, the first stave cooler 10 is formed by sequentially arranging a plurality of first stave cooler bodies 11 along the circumferential direction of the blast furnace shell 200, a vertically arranged first expansion joint 12 is provided between two adjacent first stave cooler bodies 11, and the first expansion joint 12 is arranged in a staggered manner with respect to a second expansion joint 22 therebelow.
In an alternative example, the first stave 10 is a cast iron stave or a cast steel stave.
In an alternative example, the second stave 20 is a copper stave.
In another alternative example, the second stave 20 is a composite stave having a copper material on a hot side.
The present invention is not limited to the above embodiments, and in particular, various features described in different embodiments can be arbitrarily combined with each other to form other embodiments, and the features are understood to be applicable to any embodiment except the explicitly opposite descriptions, and are not limited to the described embodiments.
Claims (10)
1. The cooling wall structure is characterized by comprising a first cooling wall and a second cooling wall which are different in heat conductivity coefficient, wherein the first cooling wall is positioned above the second cooling wall, and the bottom edge of the hot surface of the first cooling wall and the top edge of the hot surface of the second cooling wall are provided with a retraction interval in the horizontal direction.
2. The stave structure of claim 1 wherein the first stave has a hot face covered with a first brick and the second stave has a hot face covered with a second brick, the first brick having a bottom edge of its hot face flush with a top edge of its hot face of the second brick.
3. The stave structure of claim 1 wherein the first stave has a thermal conductivity less than that of the second stave, and wherein a bottom edge of the hot face of the first stave protrudes inwardly from a top edge of the hot face of the second stave.
4. The stave structure of any one of claims 1 to 3 wherein the second stave comprises a plurality of second cooling sections sequentially arranged from top to bottom, each of the second cooling sections is formed by a plurality of second stave bodies sequentially arranged along a circumferential direction of the furnace shell, and a vertically disposed second expansion joint is provided between two adjacent second stave bodies.
5. The stave structure of claim 4 wherein two of said second expansion joints adjacent above and below are aligned.
6. The stave structure of claim 4 wherein two of said second expansion joints adjacent one above the other are offset, and wherein the offset distance between the two expansion joints is smaller than the width of the second expansion joint.
7. The stave structure of claim 4 wherein the second stave body is a flat plate.
8. The stave structure of claim 1 or 2 wherein the first stave is a cast iron stave or a cast steel stave.
9. The stave structure of claim 1 or 2 wherein the second stave is a copper stave.
10. The stave structure of claim 1 or 2 wherein the second stave is a composite stave, the hot face of the composite stave being of a copper material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911154419.1A CN112831620A (en) | 2019-11-22 | 2019-11-22 | Cooling wall structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911154419.1A CN112831620A (en) | 2019-11-22 | 2019-11-22 | Cooling wall structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112831620A true CN112831620A (en) | 2021-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911154419.1A Pending CN112831620A (en) | 2019-11-22 | 2019-11-22 | Cooling wall structure |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002060821A (en) * | 2000-08-08 | 2002-02-28 | Nippon Steel Corp | Structure for furnace wall in blast furnace and method for operating blast furnace |
| JP2015074794A (en) * | 2013-10-07 | 2015-04-20 | Ｊｆｅスチール株式会社 | Method of designing blast furnace stave |
| CN205077079U (en) * | 2015-10-30 | 2016-03-09 | 武汉钢铁(集团)公司 | Cooling wall for "bosh of blast furnace |
| CN205205162U (en) * | 2015-12-20 | 2016-05-04 | 武汉钢铁(集团)公司 | Brick cooling wall is inlayed to blast furnace |
| CN110343797A (en) * | 2019-08-16 | 2019-10-18 | 中冶赛迪工程技术股份有限公司 | A kind of blast furnace cooling wall laying brick structure |
| CN211367613U (en) * | 2019-11-22 | 2020-08-28 | 中冶京诚工程技术有限公司 | Cooling wall structure |
-
2019
- 2019-11-22 CN CN201911154419.1A patent/CN112831620A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002060821A (en) * | 2000-08-08 | 2002-02-28 | Nippon Steel Corp | Structure for furnace wall in blast furnace and method for operating blast furnace |
| JP2015074794A (en) * | 2013-10-07 | 2015-04-20 | Ｊｆｅスチール株式会社 | Method of designing blast furnace stave |
| CN205077079U (en) * | 2015-10-30 | 2016-03-09 | 武汉钢铁(集团)公司 | Cooling wall for "bosh of blast furnace |
| CN205205162U (en) * | 2015-12-20 | 2016-05-04 | 武汉钢铁(集团)公司 | Brick cooling wall is inlayed to blast furnace |
| CN110343797A (en) * | 2019-08-16 | 2019-10-18 | 中冶赛迪工程技术股份有限公司 | A kind of blast furnace cooling wall laying brick structure |
| CN211367613U (en) * | 2019-11-22 | 2020-08-28 | 中冶京诚工程技术有限公司 | Cooling wall structure |
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