CN115852075A - Blast furnace bottom hearth with heat conduction and erosion coupling effect - Google Patents
Blast furnace bottom hearth with heat conduction and erosion coupling effect Download PDFInfo
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- CN115852075A CN115852075A CN202211491371.5A CN202211491371A CN115852075A CN 115852075 A CN115852075 A CN 115852075A CN 202211491371 A CN202211491371 A CN 202211491371A CN 115852075 A CN115852075 A CN 115852075A
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- erosion
- hearth
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- furnace
- furnace bottom
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- 230000003628 erosive effect Effects 0.000 title claims abstract description 101
- 230000001808 coupling effect Effects 0.000 title abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000012546 transfer Methods 0.000 claims abstract description 37
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 239000011449 brick Substances 0.000 claims description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 239000010439 graphite Substances 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 239000011819 refractory material Substances 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 description 19
- 230000007797 corrosion Effects 0.000 description 12
- 239000002893 slag Substances 0.000 description 5
- 241000406668 Loxodonta cyclotis Species 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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Abstract
The invention provides a blast furnace bottom hearth with heat conduction and erosion coupling effects, which comprises a hearth lining positioned at the upper part of a furnace body and a furnace bottom lining positioned at the bottom of the furnace body, wherein the hearth lining comprises a hearth heat transfer layer, a hearth heat transfer layer and a hearth erosion-resistant layer which are sequentially arranged from outside to inside, the furnace bottom lining comprises a furnace bottom heat transfer layer, a furnace bottom erosion-resistant layer and a furnace bottom erosion-resistant layer which are sequentially arranged from bottom to top, and the molten iron erosion index of the furnace bottom erosion-resistant layer is greater than that of the furnace bottom erosion-resistant layer and the hearth erosion-resistant layer. This blast furnace stove bottom hearth is through the hierarchical structure design to stove bottom hearth, designs the superiors at the stove bottom for the erosion layer simultaneously, realizes heat-conduction and erosion coupling effect, comes the initiative guide blast furnace to "bottom of a boiler form" erosion development to alleviate the hearth "like foot form" erosion, and then prolong the hearth life-span.
Description
Technical Field
The invention belongs to the technical field of metallurgical industry, and particularly relates to a heat conduction and erosion coupled blast furnace bottom hearth.
Background
The blast furnace is an important component of modern iron and steel united enterprises, the blast furnace construction investment is large, the period is long, and the influence on the whole steel production process is great, so the long-life problem of the blast furnace is always the focus of attention of ironmaking workers.
The most important limitation for prolonging the service life of the blast furnace is the service life of the hearth, and the problem of prolonging the service life of the hearth is a system project and is influenced by various factors, including flowing scouring, chemical erosion, thermal stress impact, damage to harmful elements and the like of high-temperature liquid iron slag.
A great deal of damage investigation at home and abroad shows that the types of corrosion of the furnace bottom and the furnace hearth mainly comprise 'elephant foot-shaped' corrosion and 'pot bottom-shaped' corrosion; the corrosion of the elephant foot shape means that the corrosion line is in the elephant foot shape at the joint of the furnace bottom and the furnace hearth, so that the thickness of refractory materials on the side wall of the furnace hearth is greatly reduced, and even burnthrough accidents occur; the 'pan bottom-shaped' erosion is mainly the heavy erosion of refractory materials in the area of the furnace bottom. Mass production practices and research studies show that the erosion of the hearth of the blast furnace with relatively serious erosion of the furnace bottom is generally relatively insignificant, so that if the blast furnace can be actively guided to be corroded and developed to the bottom of the boiler by optimizing the design structure of the hearth of the furnace bottom, the erosion of the hearth to be foot-shaped is reduced, and the service life of the hearth is prolonged, which is very necessary.
Disclosure of Invention
The invention aims to provide a blast furnace bottom hearth with heat conduction and erosion coupling effects, which can at least solve part of defects in the prior art.
In order to achieve the purpose, the invention provides a blast furnace bottom hearth with the heat conduction and erosion coupling effect, which comprises a hearth lining positioned at the upper part of a furnace body and a furnace bottom lining positioned at the bottom of the furnace body, wherein the hearth lining comprises a hearth heat transfer layer, a hearth heat transfer layer and a hearth erosion-resistant layer which are sequentially arranged from outside to inside, the furnace bottom lining comprises a furnace bottom heat transfer layer, a furnace bottom erosion-resistant layer and a furnace bottom erosion-resistant layer which are sequentially arranged from bottom to top, and the molten iron erosion index of the furnace bottom erosion-resistant layer is larger than that of the furnace bottom erosion-resistant layer and the furnace hearth erosion-resistant layer.
Furthermore, the hearth heat transfer layer adopts a hearth cooling facility for providing cooling water for the hearth, and the bottom heat transfer layer adopts a bottom cooling facility for providing cooling water for the bottom.
Furthermore, the hearth heat transfer layer adopts a hearth cooling wall, and the furnace bottom heat transfer layer adopts a furnace bottom water-cooling pipe.
Furthermore, the heat conducting layer of the hearth and the heat conducting layer of the furnace bottom adopt permanent linings with heat conductivity coefficient more than or equal to 20W/m.K.
Furthermore, the hearth heat-conducting layer and the furnace bottom heat-conducting layer are made of at least one of castable, ramming material, graphite bricks and heat-conducting carbon bricks.
Furthermore, the hearth erosion-resistant layer and the furnace bottom erosion-resistant layer adopt safety linings with the heat conductivity coefficient of more than or equal to 18W/m.K at 300 ℃ and the molten iron erosion index of less than or equal to 23%.
Furthermore, the hearth anti-corrosion layer and the furnace bottom anti-corrosion layer adopt at least one of ultramicropore carbon bricks or molded carbon bricks.
Furthermore, the furnace bottom erosion layer adopts a working lining with molten iron erosion index not less than 25% and heat conductivity coefficient not more than 15W/m.K at 300 ℃.
Furthermore, the furnace bottom erosion layer adopts at least one of microporous carbon bricks or semi-graphite bricks.
Furthermore, the hearth heat conduction layer, the hearth erosion-resistant layer, the furnace bottom heat conduction layer, the furnace bottom erosion-resistant layer and the furnace bottom erosion-resistant layer are all made of refractory materials.
Compared with the prior art, the invention has the beneficial effects that:
the blast furnace hearth with the heat conduction and erosion coupling effect provided by the invention realizes the heat conduction and erosion coupling effect by designing the hierarchical structure of the hearth and designing the uppermost layer of the hearth as an erosion layer to actively guide the blast furnace to develop towards the bottom-of-a-boiler-shaped erosion, thereby reducing the foot-shaped erosion of the hearth and further prolonging the service life of the hearth.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view showing the structure of a hearth of a blast furnace according to the present invention.
Description of the reference numerals: 1. a furnace bottom heat transfer layer; 2. a heat conduction layer at the bottom of the furnace; 3. a hearth erosion resistant layer; 4. a furnace bottom erosion layer; 5. a hearth heat transfer layer; 6. a hearth heat conducting layer; 7. and the hearth corrosion-resistant layer.
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.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, interference-connected, or integrally connected; the specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, the present embodiment provides a blast furnace bottom hearth of heat conduction and erosion coupling, including the hearth inside lining that is located the furnace body upper portion and the furnace bottom inside lining of furnace body bottom, the hearth inside lining includes the hearth heat transfer layer 5, the hearth heat transfer layer 6 and the hearth anti-erosion layer 7 that set gradually by outside (being the cold surface) to inside (the hot surface), the furnace bottom inside lining includes the bottom heat transfer layer 1, the bottom heat transfer layer 2, the bottom anti-erosion layer 3 and the bottom erosion layer 4 that set gradually from bottom to top, the molten iron corrosion index on bottom erosion layer 4 is greater than the molten iron corrosion index on bottom anti-erosion layer 3 and the hearth anti-erosion layer 7.
In this embodiment, the hearth lining and the bottom lining are designed in a multi-layer structure, wherein the hearth heat-conducting layer 6, the hearth erosion-resistant layer 7, the bottom heat-conducting layer 2, the bottom erosion-resistant layer 3 and the bottom erosion-resistant layer 4 are made of refractory materials. The hearth heat transfer layer 5 and the furnace bottom heat transfer layer 1 adopt cooling facilities for transferring hearth heat and furnace bottom heat to an external heat exchange system for cooling, specifically, the hearth heat transfer layer 5 can adopt but is not limited to a hearth cooling wall, the furnace bottom heat transfer layer 1 can adopt but is not limited to a furnace bottom water cooling pipe, and the heat of the hearth and the furnace bottom is transferred to the heat exchange system for cooling through a water medium; the hearth heat-conducting layer 6 and the furnace bottom heat-conducting layer 2 adopt permanent linings with high heat conductivity coefficients so as to rapidly conduct the heat of the hearth and the furnace bottom to the hearth heat-transferring layer 5 and the furnace bottom heat-transferring layer 1; the hearth anti-corrosion layer 7 and the furnace bottom anti-corrosion layer 3 adopt safety linings with higher heat conductivity coefficient and low molten iron corrosion index simultaneously, the higher heat conductivity coefficient can timely conduct the heat in the furnace to the heat conduction layer to reduce the temperature of the hot surface of the anti-corrosion layer to form a slag iron solidified layer so as to protect the slag iron solidified layer from being corroded, and the low molten iron corrosion index can resist the corrosion of high-temperature molten iron in the furnace by virtue of the excellent molten iron corrosion resistance of the slag iron solidified layer even if the slag iron solidified layer falls off due to unstable furnace conditions; and the furnace bottom erosion layer 4 is paved on the uppermost layer of the furnace bottom, a working lining with high molten iron erosion index is adopted, the furnace bottom erosion layer 4 has poor molten iron erosion resistance and can be eroded by high-temperature molten iron in the furnace, and the erosion thickness of the furnace bottom erosion layer 4 is gradually increased along with the time continuation, so that a 'pot bottom shape' is formed on the furnace bottom.
According to the blast furnace bottom hearth of the embodiment, the hearth and the hearth are designed in a hierarchical structure, the heat transfer mode of the hearth and the hearth is conduction heat transfer, and the heat of high-temperature molten iron is conducted to a hearth cooling wall and a furnace bottom water-cooling pipe through refractory materials and is taken away by cooling water; meanwhile, the uppermost layer of the furnace bottom is designed to be an erosion layer, high-temperature molten iron in the furnace is actively guided to be eroded in the furnace bottom, the coupling effect of heat conduction and erosion is realized, the blast furnace is further actively guided to be eroded towards a pot bottom shape, the erosion of a furnace hearth in a foot-like shape is reduced, and the service life of the furnace hearth is prolonged.
As an implementation mode, the furnace hearth heat conduction layer 6 and the furnace bottom heat conduction layer 2 adopt permanent linings with heat conduction coefficients more than or equal to 20W/m.K; specifically, the hearth heat-conducting layer 6 and the furnace bottom heat-conducting layer 2 can be at least one of but not limited to castable, ramming material, graphite brick and heat-conducting carbon brick. In the embodiment, the heat conduction layer 2 at the bottom of the furnace adopts a combination of a castable with a heat conductivity coefficient of 20W/m.K and graphite bricks, and the heat conduction layer 6 at the hearth of the furnace adopts a castable with a heat conductivity coefficient of 20W/m.K. Optimally, the hearth heat-conducting layer 6 and the furnace bottom heat-conducting layer 2 can adopt one-layer or multi-layer structure design according to actual needs.
As an implementation mode, the hearth erosion-resistant layer 7 and the furnace bottom erosion-resistant layer 3 adopt a safety lining with the heat conductivity coefficient more than or equal to 18W/m.K at 300 ℃ and the molten iron erosion index less than or equal to 23%; specifically, the hearth erosion resistant layer 7 and the furnace bottom erosion resistant layer 3 can adopt but are not limited to at least one of ultramicropore carbon bricks or molded carbon bricks. In the embodiment, the furnace bottom erosion resistant layer 3 and the furnace hearth erosion resistant layer 7 both adopt ultramicropore carbon bricks with the heat conductivity coefficient (300 ℃) of 18W/m.K and the molten iron erosion index of 20%. Optimally, the hearth anti-corrosion layer 7 and the furnace bottom anti-corrosion layer 3 can adopt one-layer or multi-layer structural design according to actual needs.
As an implementation mode, the furnace bottom erosion layer 4 adopts a working lining with a molten iron erosion index of more than or equal to 25% and a thermal conductivity coefficient of less than or equal to 15W/m.K at 300 ℃; specifically, the furnace bottom erosion layer 4 can adopt but is not limited to at least one of a microporous carbon brick or a semi-graphite brick. In the embodiment, the furnace bottom erosion layer 4 is made of half-graphite bricks with molten iron erosion index of 28% and heat conductivity coefficient (300 ℃) of 10W/m.K. Optimally, the furnace bottom erosion layer 4 can adopt one-layer or multi-layer structure design according to actual needs.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (10)
1. The utility model provides a heat-conduction and erosion coupling's blast furnace stove bottom hearth, includes the stove bottom inside lining that is located the hearth inside lining on furnace body upper portion and furnace body bottom, its characterized in that: the hearth lining comprises a hearth heat transfer layer, a hearth heat transfer layer and a hearth erosion-resistant layer which are sequentially arranged from outside to inside, the furnace bottom lining comprises a furnace bottom heat transfer layer, a furnace bottom erosion-resistant layer and a furnace bottom erosion-resistant layer which are sequentially arranged from bottom to top, and the molten iron erosion index of the furnace bottom erosion-resistant layer is larger than that of the furnace bottom erosion-resistant layer and that of the hearth erosion-resistant layer.
2. The heat transfer and erosion coupled blast furnace hearth of claim 1, further comprising: the hearth heat transfer layer adopts a hearth cooling facility for providing cooling water for the hearth, and the furnace bottom heat transfer layer adopts a furnace bottom cooling facility for providing cooling water for the furnace bottom.
3. The heat transfer and erosion coupled blast furnace hearth of claim 2, further comprising: the hearth heat transfer layer adopts a hearth cooling wall, and the furnace bottom heat transfer layer adopts a furnace bottom water-cooling pipe.
4. The heat transfer and erosion coupled blast furnace hearth of claim 1, further comprising: the furnace hearth heat conduction layer and the furnace bottom heat conduction layer adopt permanent linings with heat conduction coefficients more than or equal to 20W/m.K.
5. The heat-conduction and erosion-coupled blast furnace hearth of claim 4, wherein: the heat conducting layer of the hearth and the heat conducting layer of the furnace bottom adopt at least one of castable, ramming mass, graphite bricks and heat conducting carbon bricks.
6. The heat transfer and erosion-coupled blast furnace hearth of claim 1, further comprising: the hearth erosion-resistant layer and the furnace bottom erosion-resistant layer adopt safety linings with the heat conductivity coefficient of more than or equal to 18W/m.K at 300 ℃ and the molten iron erosion index of less than or equal to 23%.
7. The heat transfer and erosion coupled blast furnace hearth of claim 5, wherein: the hearth anti-erosion layer and the furnace bottom anti-erosion layer adopt at least one of ultramicropore carbon bricks or molded carbon bricks.
8. The heat transfer and erosion coupled blast furnace hearth of claim 1, further comprising: the furnace bottom erosion layer adopts a working lining with molten iron erosion index more than or equal to 25% and heat conductivity coefficient less than or equal to 15W/m.K at 300 ℃.
9. The heat transfer and erosion-coupled blast furnace hearth of claim 8, wherein: the furnace bottom erosion layer adopts at least one of microporous carbon bricks or semi-graphite bricks.
10. The heat transfer and erosion-coupled blast furnace hearth of claim 1, further comprising: and the hearth heat conduction layer, the hearth erosion-resistant layer, the furnace bottom heat conduction layer, the furnace bottom erosion-resistant layer and the furnace bottom erosion-resistant layer are all made of refractory materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211491371.5A CN115852075A (en) | 2022-11-25 | 2022-11-25 | Blast furnace bottom hearth with heat conduction and erosion coupling effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211491371.5A CN115852075A (en) | 2022-11-25 | 2022-11-25 | Blast furnace bottom hearth with heat conduction and erosion coupling effect |
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| CN115852075A true CN115852075A (en) | 2023-03-28 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676616A (en) * | 2005-04-01 | 2005-10-05 | 武汉钢铁(集团)公司 | Blast furnace hearth |
| CN201770713U (en) * | 2010-07-23 | 2011-03-23 | 平顶山市鲁山亚星炭素材料有限公司 | Combined lining structure of furnace bottom and hearth of blast furnace |
| CN201945181U (en) * | 2011-01-17 | 2011-08-24 | 河南方圆炭素集团 | High-conductivity graphite block furnace bottom for submerged arc furnace |
| CN201954966U (en) * | 2011-03-11 | 2011-08-31 | 河南方圆炭素集团 | Ultra-microporous carbon block furnace lining for submerged arc furnace |
| CN205576184U (en) * | 2015-11-13 | 2016-09-14 | 武汉钢铁(集团)公司 | Good blast furnace crucibe of heat conduction |
| CN215887093U (en) * | 2021-01-27 | 2022-02-22 | 山东省冶金设计院股份有限公司 | Long-life furnace bottom and hearth structure |
-
2022
- 2022-11-25 CN CN202211491371.5A patent/CN115852075A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676616A (en) * | 2005-04-01 | 2005-10-05 | 武汉钢铁(集团)公司 | Blast furnace hearth |
| CN201770713U (en) * | 2010-07-23 | 2011-03-23 | 平顶山市鲁山亚星炭素材料有限公司 | Combined lining structure of furnace bottom and hearth of blast furnace |
| CN201945181U (en) * | 2011-01-17 | 2011-08-24 | 河南方圆炭素集团 | High-conductivity graphite block furnace bottom for submerged arc furnace |
| CN201954966U (en) * | 2011-03-11 | 2011-08-31 | 河南方圆炭素集团 | Ultra-microporous carbon block furnace lining for submerged arc furnace |
| CN205576184U (en) * | 2015-11-13 | 2016-09-14 | 武汉钢铁(集团)公司 | Good blast furnace crucibe of heat conduction |
| CN215887093U (en) * | 2021-01-27 | 2022-02-22 | 山东省冶金设计院股份有限公司 | Long-life furnace bottom and hearth structure |
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