CN115612770A - Method for prolonging service life of blast furnace hearth - Google Patents
Method for prolonging service life of blast furnace hearth Download PDFInfo
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- CN115612770A CN115612770A CN202211364037.3A CN202211364037A CN115612770A CN 115612770 A CN115612770 A CN 115612770A CN 202211364037 A CN202211364037 A CN 202211364037A CN 115612770 A CN115612770 A CN 115612770A
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- Prior art keywords
- brick layer
- layer
- brick
- microporous
- hearth
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000011449 brick Substances 0.000 claims abstract description 147
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 52
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 49
- 239000010431 corundum Substances 0.000 claims abstract description 49
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 22
- 239000010439 graphite Substances 0.000 claims abstract description 22
- 238000010276 construction Methods 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 19
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 239000011819 refractory material Substances 0.000 claims abstract description 11
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical group O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008646 thermal stress Effects 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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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
- C21B7/06—Linings for furnaces
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
Abstract
The invention discloses a method for prolonging the service life of a blast furnace hearth, which comprises the following steps: designing a refractory material structure of the side wall of a hearth; step two, refractory material construction; step three, pouring material construction; step four, construction is carried out in a reciprocating manner; in the third step, the pouring material filled into the pouring cavity is silica sol silicon carbide pouring material; the microporous corundum brick layer and the ultramicropore carbon brick layer are tightly combined by adopting the castable, so that the molten iron corrosion resistance of the furnace body is effectively improved, the service life of the hearth is prolonged, the adopted ultramicropore carbon brick is less than 1.0 m, the thermal stress damage effect in the carbon brick is effectively eliminated, and the service life of the hearth is further prolonged by matching with the high heat conductivity of the graphite brick; the invention can improve the compression strength and the heat conduction capability of the hearth by laying a layer of graphite bricks on top, indirectly prolong the service life of the ultramicropore carbon bricks, eliminate the influence of arrangement of galvanic couples, avoid burning through of the hearth and prolong the service life of the first generation furnace to more than 15 years.
Description
Technical Field
The invention relates to the technical field of blast furnaces, in particular to a method for prolonging the service life of a blast furnace hearth.
Background
The blast furnace is a smelting device, in the prior art, the side wall of a hearth of the blast furnace generally adopts two structures of a heat transfer type full carbon brick and a heat insulation type ceramic cup and carbon brick, the first-generation furnace life is more than 5-12 years, a few blast furnaces reach the standard of long-life blast furnaces, and the first-generation furnace life is more than 15 years. The first-generation furnace life of the blast furnace depends on the service life of the hearth, and the main reason for short furnace life is that the abnormal corrosion of the side wall of the hearth cannot meet the requirement of safe production and the furnace is shut down for maintenance.
The ceramic cup brick of the existing furnace pot is eroded till the end after 3 to 5 years, and molten iron contacts the carbon brick. Under the condition of taking no measures, the carbon bricks can be corroded to the safe thickness in 1-2 years, namely the residual thickness of the carbon bricks is less than 0.4 m. At this time, no matter blowing out for maintenance or protecting the furnace, the yield is reduced, and the enterprise cost is increased. Therefore, a method for prolonging the service life of the blast furnace hearth is urgently needed.
Disclosure of Invention
The present invention is directed to a method for extending the service life of a blast furnace hearth to solve the problems set forth in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for prolonging the service life of a blast furnace hearth comprises the following steps: designing a refractory material structure of the side wall of a hearth; step two, refractory material construction; step three, pouring material construction; step four, construction is carried out in a reciprocating manner;
in the first step, designing a refractory structure on the side wall of the hearth, wherein the structure comprises a hearth brick lining, a graphite brick layer, an ultra-microporous carbon brick layer, a castable filling layer, a first microporous corundum brick layer, a second microporous corundum brick layer and an iron notch combined brick;
in the second step, firstly building a layer of graphite bricks on the brick lining at the bottom of the furnace close to the top of the cooling wall to form a graphite brick layer, then building ultramicropore carbon bricks to form an ultramicropore carbon brick layer, then building micropore corundum to form a first micropore corundum brick layer, and reserving a pouring cavity between the first micropore corundum brick layer and the ultramicropore carbon brick layer;
in the third step, in the process of the second step, pouring the castable once every 0.8-1.2 meters above the height of the built furnace hearth, namely, filling the castable into a pouring cavity to form a castable filling layer;
and in the fourth step, repeating the second step and the third step until the height requirement is met, building a taphole combined brick on the finished ultramicropore carbon brick layer, building a second micropore corundum brick layer on the inner wall of the taphole combined brick, and capping the pouring cavity by the second micropore corundum brick layer to complete the construction of the refractory material structure on the side wall of the hearth.
Preferably, in the first step, an ultra-microporous carbon brick layer is fixedly connected to the upper surface of the furnace bottom brick lining, an iron notch combined brick is fixedly connected to the upper surface of the ultra-microporous carbon brick layer, a second microporous corundum brick layer is fixedly connected to the inner wall of the iron notch combined brick, a graphite brick layer is fixedly connected to the outer wall of the ultra-microporous carbon brick layer, a first microporous corundum brick layer is arranged on the inner wall of the ultra-microporous carbon brick layer, the first microporous corundum brick layer is fixedly connected to the lower surface of the second microporous corundum brick layer, a pouring cavity is arranged on the outer wall of one side of the first microporous corundum brick layer and corresponds to the position of the ultra-microporous carbon brick layer, and a castable filling layer is arranged in the pouring cavity.
Preferably, in the step one, the thickness of the graphite brick layer is 0.23 m, the thickness of the ultramicropore carbon brick layer is 0.7-1.0 m, the thickness of the casting material filling layer is 0.5 m, the thickness of the first micropore corundum brick layer is 0.345 m, and the width of the casting cavity is 0.3 m.
Preferably, in the second step, the length of the ultramicropore carbon brick is less than 1.0 meter.
Preferably, in the third step, the casting material filled into the casting cavity is silica sol silicon carbide casting material.
Preferably, in the third step, when pouring construction of the castable is carried out, the expansion joint is reserved at the middle position of the two tapholes, and the expansion joint is not arranged at the left and right sides of the taphole for 6 meters (arc length).
Compared with the prior art, the invention has the beneficial effects that: the microporous corundum brick layer and the ultramicropore carbon brick layer are tightly combined by adopting the castable, so that the molten iron corrosion resistance of the furnace body is effectively improved, the service life of the hearth is prolonged, the adopted ultramicropore carbon brick is less than 1.0 m, the thermal stress damage effect in the carbon brick is effectively eliminated, and the service life of the hearth is further prolonged by matching with the high heat conductivity of the graphite brick; the invention can improve the compression strength and the heat conduction capability of the hearth by laying a layer of graphite bricks on top, indirectly prolong the service life of the ultramicropore carbon bricks, eliminate the influence of arrangement of galvanic couples, avoid burning through of the hearth and prolong the service life of the first generation furnace to more than 15 years.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a structural view of refractory of a hearth side wall according to the present invention.
In the figure: 1. a furnace bottom brick lining; 2. a graphite brick layer; 3. an ultra-microporous carbon brick layer; 4. a castable filling layer; 5. a first microporous corundum brick layer; 6. a second microporous corundum brick layer; 7. iron notch combined brick.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, an embodiment of the present invention is shown: a method for prolonging the service life of a blast furnace hearth comprises the following steps: designing a refractory material structure of the side wall of a hearth; step two, refractory material construction; step three, pouring material construction; step four, construction is carried out in a reciprocating manner;
in the first step, a refractory structure of the side wall of the hearth is designed, the structure comprises a hearth brick lining 1, a graphite brick layer 2, an ultra-microporous carbon brick layer 3, a castable filling layer 4, a first microporous corundum brick layer 5, a second microporous corundum brick layer 6 and an iron notch combined brick 7, the upper surface of the hearth brick lining 1 is fixedly connected with the ultra-microporous carbon brick layer 3, the upper surface of the ultra-microporous carbon brick layer 3 is fixedly connected with the iron notch combined brick 7, the inner wall of the iron notch combined brick 7 is fixedly connected with the second microporous corundum brick layer 6, the outer wall of the ultra-microporous carbon brick layer 3 is fixedly connected with the graphite brick layer 2, the inner wall of the ultra-microporous corundum brick layer 3 is provided with the first microporous corundum brick layer 5, the first microporous corundum brick layer 5 is fixedly connected to the lower surface of the second microporous corundum brick layer 6, a pouring cavity is arranged at a position, corresponding to the ultra-microporous corundum brick layer 3, on the outer wall of one side of the first microporous corundum brick layer 5, the pouring filling layer 4 is arranged in the pouring cavity, the thickness of the graphite brick layer 2 is 0.23 m, the corundum brick layer 3 is 0.7-0.7 m, the castable filling layer is 0.345 m, and the width of the first microporous corundum brick is 0.5 m of the castable;
in the second step, firstly, building a layer of graphite bricks on the furnace bottom brick lining 1 close to the top of the cooling wall to form a graphite brick layer 2, then building ultramicropore carbon bricks to form an ultramicropore carbon brick layer 3, then building micropore corundum to form a first micropore corundum brick layer 5, and reserving a pouring cavity between the first micropore corundum brick layer 5 and the ultramicropore carbon brick layer 3; wherein the length of the ultramicropore carbon brick is less than 1.0 meter;
in the third step, in the process of the second step, pouring materials are poured once every 0.8-1.2 m of the height of the built furnace hearth, namely silica sol silicon carbide pouring materials are filled into a pouring cavity to form a pouring material filling layer 4; in addition, when pouring construction of the castable is carried out, an expansion joint is reserved at the middle position of the two tapholes, and the expansion joint is not arranged at the left and right sides of the taphole for 6 meters (arc length);
and in the fourth step, repeating the second step and the third step until the height requirement is met, building a taphole combined brick 7 on the finished ultramicropore carbon brick layer 3, building a second micropore corundum brick layer 6 on the inner wall of the taphole combined brick 7, and capping the pouring cavity by the second micropore corundum brick layer 6 to complete the construction of the refractory material structure on the side wall of the hearth.
Based on the above, the invention has the advantages that:
1. the castable is tightly combined with the microporous corundum bricks and the ultramicropore carbon bricks to form a whole, and the service life of the microporous corundum bricks reaches more than 5 years;
2. after the microporous corundum bricks are corroded, the castable has excellent molten iron corrosion resistance and has the service life of more than 3 years;
3. the length of the ultramicropore carbon brick is less than 1.0 meter, the thermal stress damage effect in the carbon brick is effectively eliminated, and the service life of the carbon brick is more than 7 years by matching with the high heat conductivity of the graphite brick;
4. a layer of graphite bricks is laid on the top, the compressive strength and the heat conduction capability are both superior to those of the ramming material, the service life of the carbon bricks is indirectly prolonged, the influence of arrangement of a galvanic couple is eliminated, and a hearth is prevented from being burnt through;
5. during pouring construction, an expansion joint is reserved at the middle position of the two tapholes, so that an abnormal erosion area of the tapholes is avoided;
6. the structural form of the refractory on the side wall of the hearth meets the requirement that the furnace life of the first generation reaches more than 15 years.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A method for prolonging the service life of a blast furnace hearth comprises the following steps: designing a refractory material structure of the side wall of a hearth; step two, refractory material construction; step three, pouring material construction; step four, construction is carried out in a reciprocating manner; the method is characterized in that:
in the first step, a refractory structure on the side wall of the hearth is designed, and the refractory structure comprises a hearth brick lining (1), a graphite brick layer (2), an ultra-microporous carbon brick layer (3), a castable filling layer (4), a first microporous corundum brick layer (5), a second microporous corundum brick layer (6) and an iron notch combined brick (7);
in the second step, firstly, building a layer of graphite bricks on the furnace bottom brick lining (1) close to the top of the cooling wall to form a graphite brick layer (2), then building ultra-microporous carbon bricks to form an ultra-microporous carbon brick layer (3), then building microporous corundum to form a first microporous corundum brick layer (5), and reserving a pouring cavity between the first microporous corundum brick layer (5) and the ultra-microporous carbon brick layer (3);
in the third step, in the process of the second step, pouring casting materials are poured once every 0.8-1.2 m of the height of the built furnace hearth, namely, the casting materials are filled into a pouring cavity to form a casting material filling layer (4);
and in the fourth step, repeating the second step and the third step until the height requirement is met, building a taphole combined brick (7) on the finished ultramicro-porous carbon brick layer (3), building a second microporous corundum brick layer (6) on the inner wall of the taphole combined brick (7), and capping the pouring cavity by using the second microporous corundum brick layer (6) to finish the construction of the refractory material structure on the side wall of the hearth.
2. The method of claim 1, wherein the method further comprises the step of: in the first step, the upper surface of the furnace bottom brick lining (1) is fixedly connected with an ultra-microporous carbon brick layer (3), the upper surface of the ultra-microporous carbon brick layer (3) is fixedly connected with an iron notch combined brick (7), the inner wall of the iron notch combined brick (7) is fixedly connected with a second microporous corundum brick layer (6), the outer wall of the ultra-microporous carbon brick layer (3) is fixedly connected with a graphite brick layer (2), the inner wall of the ultra-microporous carbon brick layer (3) is provided with a first microporous corundum brick layer (5), the first microporous corundum brick layer (5) is fixedly connected to the lower surface of the second microporous corundum brick layer (6), a pouring cavity is arranged at a position, corresponding to the ultra-microporous carbon brick layer (3), on the outer wall of one side of the first microporous corundum brick layer (5), and a castable filling layer (4) is arranged in the pouring cavity.
3. The method of claim 1, wherein the method further comprises the step of: in the first step, the thickness of the graphite brick layer (2) is 0.23 m, the thickness of the ultramicropore carbon brick layer (3) is 0.7-1.0 m, the thickness of the casting material filling layer (4) is 0.5 m, the thickness of the first micropore corundum brick layer (5) is 0.345 m, and the width of the casting cavity is 0.3 m.
4. The method of claim 1, wherein the method further comprises the step of: in the second step, the length of the ultramicropore carbon brick is less than 1.0 meter.
5. The method of claim 1, wherein the method further comprises the step of: in the third step, the pouring material filled in the pouring cavity is silica sol silicon carbide pouring material.
6. The method of claim 1, wherein the method further comprises the step of: in the third step, when pouring construction of the castable is carried out, the expansion joint is reserved in the middle of the two tapholes, and the expansion joint is not arranged at the left and right sides of the taphole for 6 meters (arc length).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211364037.3A CN115612770A (en) | 2022-11-02 | 2022-11-02 | Method for prolonging service life of blast furnace hearth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211364037.3A CN115612770A (en) | 2022-11-02 | 2022-11-02 | Method for prolonging service life of blast furnace hearth |
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| Publication Number | Publication Date |
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| CN115612770A true CN115612770A (en) | 2023-01-17 |
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| CN202211364037.3A Pending CN115612770A (en) | 2022-11-02 | 2022-11-02 | Method for prolonging service life of blast furnace hearth |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012149863A (en) * | 2011-01-21 | 2012-08-09 | Jfe Steel Corp | Lining structure of furnace bottom refractory of shaft furnace |
| CN111349732A (en) * | 2020-03-11 | 2020-06-30 | 广西柳州钢铁集团有限公司 | Blast furnace hearth structure differentiation processing method |
| CN211999791U (en) * | 2020-03-11 | 2020-11-24 | 广西柳州钢铁集团有限公司 | Blast furnace hearth |
| CN213570558U (en) * | 2020-09-15 | 2021-06-29 | 广西钢铁集团有限公司 | Structure for laying graphite safety wall on hot surface of cooling wall of blast furnace hearth |
-
2022
- 2022-11-02 CN CN202211364037.3A patent/CN115612770A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012149863A (en) * | 2011-01-21 | 2012-08-09 | Jfe Steel Corp | Lining structure of furnace bottom refractory of shaft furnace |
| CN111349732A (en) * | 2020-03-11 | 2020-06-30 | 广西柳州钢铁集团有限公司 | Blast furnace hearth structure differentiation processing method |
| CN211999791U (en) * | 2020-03-11 | 2020-11-24 | 广西柳州钢铁集团有限公司 | Blast furnace hearth |
| CN213570558U (en) * | 2020-09-15 | 2021-06-29 | 广西钢铁集团有限公司 | Structure for laying graphite safety wall on hot surface of cooling wall of blast furnace hearth |
Non-Patent Citations (1)
| Title |
|---|
| 王冰;孟淑敏;贾利军;陈诚;李庆洋;: "高炉炉底、炉缸新型耐材及其结构的设计与应用", 工业炉, no. 03, pages 50 - 64 * |
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Application publication date: 20230117 |
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