CN113390265A - Prefabricated member for water-cooled furnace cover center of ultrahigh-power electric arc furnace and material thereof - Google Patents
Prefabricated member for water-cooled furnace cover center of ultrahigh-power electric arc furnace and material thereof Download PDFInfo
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- CN113390265A CN113390265A CN202110728062.4A CN202110728062A CN113390265A CN 113390265 A CN113390265 A CN 113390265A CN 202110728062 A CN202110728062 A CN 202110728062A CN 113390265 A CN113390265 A CN 113390265A
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- 238000010891 electric arc Methods 0.000 title claims abstract description 32
- 239000000463 material Substances 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 10
- 239000010431 corundum Substances 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 10
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 5
- 238000004901 spalling Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/18—Door frames; Doors, lids, removable covers
- F27D1/1808—Removable covers
- F27D1/1816—Removable covers specially adapted for arc furnaces
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention discloses a central prefabricated part of a water-cooled furnace cover of an ultrahigh-power electric arc furnace, which is formed by pouring corundum materials and steel fibers in a mixed manner; the central prefabricated part comprises an upper end surface and a lower end surface which are oppositely arranged up and down along a central line, the upper end surface and the lower end surface are similar in bow shape, chord parts of the upper end surface and the lower end surface are consistent in orientation, and the area of the upper end surface is larger than that of the lower end surface; a vertical surface vertically extends in the direction of the lower end surface of the upper end surface; a conical surface extends towards the lower end surface of the vertical surface corresponding to the arc part of the upper end surface and is connected with the lower end surface; the vertical surface corresponding to the chord part of the upper end surface extends to the lower end surface to form an inclined plane, and the inclined plane is connected with the lower end surface. The invention improves the high temperature resistance, corrosion resistance and stripping resistance of the central prefabricated part, greatly increases the thickness, further improves the use safety, prolongs the service life, and reduces the maintenance cost of the furnace cover and the production cost of steel.
Description
Technical Field
The invention relates to the field of ultrahigh power electric arc furnaces, in particular to a prefabricated member at the center of a water-cooled furnace cover of an ultrahigh power electric arc furnace and a material thereof.
Background
With the increase of power of the electric arc furnace, the traditional furnace cover built by refractory materials cannot meet the requirement of long service life of the electric arc furnace. The furnace cover of the current mainstream ultra-high power electric arc furnace adopts a water-cooled furnace cover structure, and the center of the water-cooled furnace cover is formed by a central prefabricated part integrally cast by high-strength and high-temperature-resistant refractory materials and is used for bearing heat radiation of a three-phase electrode and a molten steel bath.
The existing central prefabricated part of the water-cooled furnace cover of the 100t ultrahigh-power electric arc furnace is mainly made of high-aluminum materials, and has the problem of serious peeling around a three-phase electrode hole due to the radiation of arc light and the splashing erosion of molten steel, so that the service life of the prefabricated part is short, and the average service life of the prefabricated part is 20 heats; and the thinnest part of the central prefabricated member is only 120mm in thickness, so that great potential safety hazard exists, the central prefabricated member has to be frequently replaced, and the production rhythm is seriously influenced. Therefore, it is necessary to provide a further solution to the above problems.
Disclosure of Invention
The invention aims to provide a central prefabricated member of a water-cooled furnace cover of an ultrahigh-power electric arc furnace and a material thereof, so as to overcome the defects in the prior art.
In order to solve the technical problems, one technical scheme of the invention is as follows:
a central prefabricated part of a water-cooled furnace cover of an ultrahigh-power electric arc furnace is formed by mixing and pouring corundum materials and steel fibers; and the number of the first and second electrodes,
the central prefabricated part comprises an upper end face and a lower end face which are oppositely arranged up and down along a central line, the upper end face and the lower end face are similar in bow shape, chord parts of the upper end face and the lower end face are consistent in orientation, and the area of the upper end face is larger than that of the lower end face;
a vertical surface vertically extends from the upper end surface to the lower end surface;
the vertical surface corresponding to the arc part of the upper end surface extends to form a conical surface towards the lower end surface, and the conical surface is connected with the lower end surface;
the vertical surface corresponding to the chord part of the upper end surface extends to the lower end surface to form a chamfer surface, and the chamfer surface is connected with the lower end surface.
In a preferred embodiment of the present invention, the minimum distance between the upper end surface and the lower end surface is not less than 300 mm.
In a preferred embodiment of the invention, the upper end surface is a flat surface and the lower end surface is a spherical crown surface having a base diameter and a spherical radius.
In a preferred embodiment of the invention, the angle of inclination a of the chamfer with respect to the horizontal is between 100 ° and 120 °.
In a preferred embodiment of the invention, the density of the central preform is greater than or equal to 3.0g/cm3The refractoriness is more than or equal to 1790 ℃.
In a preferred embodiment of the present invention, the central preform has three electrode holes penetrating vertically from the upper end surface to the lower end surface, and the three electrode holes are distributed at 120 ° around a center of the central preform.
In a preferred embodiment of the present invention, the upper end surface is provided with three lifting tabs, the three lifting tabs are distributed at 120 ° around the center of the center preform, and the lifting tabs are arranged between two adjacent electrode holes.
The technical scheme of the invention is as follows: the center prefabricated part comprises the following chemical components in percentage by mass: al (Al)2O3≥85％、CaO≤0.5％、Fe2O3≤1.0％。
The other technical scheme of the invention is as follows:
a prefabricated part material for the center of the water-cooled furnace cover of an ultrahigh-power electric arc furnace comprises, by weight, 99.0% -99.5% of corundum and 0.5% -1.0% of steel fiber.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the central prefabricated member is cast by mixing the corundum material and the steel fiber, so that the high temperature resistance, corrosion resistance and spalling resistance of the central prefabricated member are improved, and meanwhile, through the matching of the upper end surface, the lower end surface, the vertical surface and the conical surface, the thickness is greatly increased compared with that of the traditional central prefabricated member, the use safety of the central prefabricated member is further improved, the service life is longer than or equal to 60 heats, the service life is prolonged compared with that of the traditional central prefabricated member, and the furnace cover maintenance cost and the steel production cost are reduced.
(2) According to the invention, the central prefabricated part material is formed by mixing 99.0-99.5% of corundum and 0.5-1.0% of steel fiber, so that the high temperature resistance, corrosion resistance and spalling resistance of the central prefabricated part are improved, the service life is further prolonged, and the furnace cover maintenance cost and the steel production cost are reduced.
Drawings
FIG. 1 is a schematic perspective view of a central prefabricated part of a water-cooled furnace cover of an ultra-high power electric arc furnace according to the present invention;
FIG. 2 is a schematic top view of a central preform of a water cooled roof of an ultra high power electric arc furnace according to the present invention;
FIG. 3 is a schematic front view of a central preform of a water cooled roof of an electric arc furnace according to the invention;
FIG. 4 is a schematic side view of a central preform of a water-cooled roof of an electric arc furnace according to the invention.
Specifically, 11, upper end face; 12. a lower end face; 13. a vertical plane; 14. a conical surface; 15. a chamfer plane;
20. an electrode hole; 30. and (4) lifting the flap.
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", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control. The term "prepared from …" as used herein is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.
As shown in fig. 1 to 4, a central prefabricated member of a water-cooled furnace cover of an ultra-high power electric arc furnace is formed by pouring corundum materials and steel fibers in a mixed manner, so that the high temperature resistance, corrosion resistance and spalling resistance of the central prefabricated member can be improved.
The central preform comprises an upper end surface 11, a lower end surface 12, a vertical surface 13, a tapered surface 14 and a chamfered surface 15. Specifically, the upper end surface 11 and the lower end surface 12 are disposed opposite to each other up and down along a center line x, and the upper end surface 11 and the lower end surface 12 are similar in bow shape, that is, the upper end surface 11 and the lower end surface 12 have the same shape. And the chord parts of the upper end surface 11 and the lower end surface 12 are in consistent orientation, namely the central prefabricated member is uniformly deformed from the upper end surface 11 to the lower end surface 12 along the central line x from top to bottom, so that the overall strength performance of the central prefabricated member can be improved in the circumferential direction. The upper end surface 11 has a larger area than the lower end surface 12 so that the lower end surface 12 is positioned inside the electric arc furnace and the upper end surface 11 is positioned outside the electric arc furnace for a good sealing of the electric arc furnace. In this embodiment, as shown in FIG. 3, the diameter D of the upper end surface 1111Is greater than the diameter D of the lower end surface 1212About 300mm, thereby realizing the comprehensive cover to water-cooling bell lid center department through up end 11 to with the thinnest department thickness of center prefab basic unanimity in order to form better cooperation, fracture when avoiding center prefab installation. The chord center distance d between the chord part of the upper end surface 11 and the center of the circle151183mm to provide a location for the electrode holes.
As shown in fig. 2 and 3, the upper end surface 11 is preferably a flat surface to facilitate operations such as installation of the center preform and replacement of the electrode. The lower end face 12 is a spherical crown face with a base diameter and a spherical radius, and the opening faces away from the upper end face 11 to form an arch. Bottom diameter, i.e. diameter D of lower end face 1212Radius of sphere R12Diameter of base D126-6.5 times of the total weight of the powder. The lower end surface 12 of the spherical crown surface can improve the overall strength performance of the central prefabricated part, particularly the circle center of the spherical crown surface is positioned right below the circle center of the lower end surface, so that a similar arch bridge structure is formed, and the overall strength of the central prefabricated part is further enhanced. And a radius of sphere R12Diameter of base D126-6.5 times of the thickness of the central prefabricated part, so that when the central prefabricated part is corroded by molten steel and is peeled to the thinnest thickness of 120mm, the central prefabricated part still keeps certain overall performance and prevents the central prefabricated part from collapsing.
As shown in fig. 1, 3 and 4, the vertical surface 13 vertically extends from the upper end surface 11 to the lower end surface 12 to increase the distance between the upper end surface 11 and the lower end surface 12, that is, the thickness of the central preform, so as to reduce the safety risk caused by the rapid thickness reduction due to arc light radiation and molten steel splash erosion, prolong the service life of the central preform, and further reduce the maintenance cost of the arc furnace and the steel production cost. The height of the vertical surface 13 is preferably 1/4, the maximum distance between the upper end surface 11 and the lower end surface 12, i.e. t13＝1/4T11-12Thereby prolonging the use times by at least 2 times.
Furthermore, the minimum distance between the upper end surface 11 and the lower end surface 12 is not less than 300mm, that is, the thickness of the thinnest part of the central prefabricated part is not less than 300mm, so that the service life of the central prefabricated part of the water-cooled furnace cover of the 100t ultrahigh-power electric arc furnace can be effectively prolonged, and the service life of the central prefabricated part of the water-cooled furnace cover of the ultrahigh-power electric arc furnace can be prolonged from 20 heats to not less than 60 heats. When the lower end surface 12 is a spherical crown surface, it means the distance t from the upper end surface 11 to the crown apex point11-12(refer to fig. 4) is not less than 300 mm. Still further, the maximum distance between the upper end surface 11 and the lower end surface 12 is about 50mm larger than the minimum distance, that is, when the lower end surface 12 is a spherical crown surface, the distance T from the upper end surface 11 to the bottom of the spherical crown surface is referred to11-12(refer to fig. 3).
The vertical surface 13 corresponding to the arc part of the upper end surface 11 extends to the lower end surface 12 to be connected with a conical surface 14, and the conical surface 14 is matched with the taper of the water-cooled furnace cover to realize better fit with the water-cooled furnace cover so as to seal the furnace mouth.
Fillet between each face of center prefab, the chamfer radius is 10mm in this embodiment, avoids center prefab edge to collide with the damage through the setting of fillet, prolongs its life.
Three electrode holes 20 are formed in the central prefabricated member in a penetrating mode from the upper end face 11 to the lower end face 12, and the three electrode holes 20 are distributed in an angle of 120 degrees by taking the circle center of the central prefabricated member as the center. Preferably, two of the electrode holes 20 are symmetrically distributed on both sides of the center line of the central preform. In this embodiment, the diameter d of the electrode hole 2020Slightly larger than the diameter of the electrode so as to facilitate the electrode to enter and exit, and the diameter D of the center circle of the three electrode holes 2020Approximately half the diameter of the upper end face so that the electrode is clamped and installed by the cross arm, and the electrode is convenient to enter and exit.
In order to facilitate hoisting of the central prefabricated member, the upper end surface 11 is provided with three lifting tabs 30, and the lifting tabs are generally installed in a pre-buried manner when the central prefabricated member is poured.
The three lifting tabs 30 are distributed in an angle of 120 degrees with the center of the center prefabricated member as the center, and the lifting tabs 30 are arranged between the two adjacent electrode holes 20 to realize stable lifting and avoid influencing the arrangement of the electrode holes 20.
The central prefabricated part material for the water cooled furnace cover of the ultrahigh-power electric arc furnace comprises 99.0-99.5 percent of corundum and 0.5-1.0 percent of steel fiber by weight, so that the high-temperature resistance, corrosion resistance and spalling resistance of the central prefabricated part are improved. More specifically, in order to enhance the bonding degree between materials, the cement also comprises 0.1 to 0.2 percent of pure calcium aluminate cement as a binder and 0.2 to 0.5 percent of water. The materials are mixed and stirred uniformly, poured into a mould, compacted by a vibrator in the pouring process, solidified, naturally dried for 3 days, demoulded, baked in a baking kiln at the baking temperature of 400 ℃ for 12 hours, and cooled to room temperature.
The central prefabricated member prepared by adopting the material comprises the following chemical components in percentage by mass: al (Al)2O3≥85％、CaO≤0.5％、Fe2O3Not more than 1.0 percent and volume density not less than 3.0g/cm3Refractoriness of not less than 1The high-temperature compressive strength is more than or equal to 100MPa (1500 ℃ and 3 hours) at 790 ℃, and the high-temperature rupture strength is more than or equal to 9 MPa.
In conclusion, the central prefabricated member is cast by mixing the corundum material and the steel fibers, so that the high temperature resistance, corrosion resistance and stripping resistance of the central prefabricated member are improved, and meanwhile, through the matching of the upper end surface, the lower end surface, the vertical surface and the conical surface, the central prefabricated member is subjected to size optimization compared with the traditional central prefabricated member, so that the use safety of the central prefabricated member is further improved, the service life of the central prefabricated member is longer than or equal to 60 heats, the service life of the central prefabricated member is prolonged compared with that of the traditional central prefabricated member, and the maintenance cost of a furnace cover and.
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.
Claims (9)
1. A central prefabricated member of a water-cooled furnace cover of an ultrahigh-power electric arc furnace is characterized in that the central prefabricated member is formed by mixing and pouring corundum materials and steel fibers; and the number of the first and second electrodes,
the central prefabricated part comprises an upper end face and a lower end face which are oppositely arranged up and down along a central line, the upper end face and the lower end face are similar in bow shape, chord parts of the upper end face and the lower end face are consistent in orientation, and the area of the upper end face is larger than that of the lower end face;
a vertical surface vertically extends from the upper end surface to the lower end surface;
the vertical surface corresponding to the arc part of the upper end surface extends to form a conical surface towards the lower end surface, and the conical surface is connected with the lower end surface;
the vertical surface corresponding to the chord part of the upper end surface extends to the lower end surface to form a chamfer surface, and the chamfer surface is connected with the lower end surface.
2. The ultra-high power electric arc furnace water-cooled furnace cover center preform as claimed in claim 1, wherein the minimum distance between the upper end surface and the lower end surface is not less than 300 mm.
3. The ultra-high power electric arc furnace water-cooled roof center preform of claim 1, wherein the upper end surface is a flat surface, the lower end surface is a spherical crown surface, and the spherical crown surface has a base diameter and a spherical radius.
4. The ultra-high power electric arc furnace water-cooled furnace cover center preform as claimed in claim 1, wherein the inclination angle α of the chamfer with respect to the horizontal plane is 100 ° to 120 °.
5. The ultra-high power electric arc furnace water-cooled furnace cover center preform as claimed in claim 1, wherein the density of the center preform is not less than 3.0g/cm3The refractoriness is more than or equal to 1790 ℃.
6. The center prefabricated member of the water-cooled furnace cover of the ultra-high power electric arc furnace as claimed in claim 1, wherein three electrode holes are formed in the center prefabricated member from the upper end surface to the lower end surface in a penetrating manner, and the three electrode holes are distributed in a 120-degree manner by taking the center of a circle of the center prefabricated member as a center.
7. The prefabricated member for the water-cooled furnace cover center of an ultra-high power electric arc furnace as claimed in claim 6, wherein three lifting tabs are arranged on the upper end surface, the three lifting tabs are distributed at 120 degrees around the center of the prefabricated member, and the lifting tabs are arranged between two adjacent electrode holes.
8. The super-high power electric arc furnace water-cooled furnace cover center prefabricated member as claimed in claim 1, wherein the center prefabricated member comprises the following chemical components in percentage by mass: al (Al)2O3≥85％、CaO≤0.5％、Fe2O3≤1.0％。
9. A prefabricated part material at the center of a water-cooled furnace cover of an ultrahigh-power electric arc furnace is characterized by comprising 99.0-99.5% of corundum and 0.5-1.0% of steel fiber by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728062.4A CN113390265A (en) | 2021-06-29 | 2021-06-29 | Prefabricated member for water-cooled furnace cover center of ultrahigh-power electric arc furnace and material thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728062.4A CN113390265A (en) | 2021-06-29 | 2021-06-29 | Prefabricated member for water-cooled furnace cover center of ultrahigh-power electric arc furnace and material thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113390265A true CN113390265A (en) | 2021-09-14 |
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| CN202110728062.4A Pending CN113390265A (en) | 2021-06-29 | 2021-06-29 | Prefabricated member for water-cooled furnace cover center of ultrahigh-power electric arc furnace and material thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479435A (en) * | 1993-04-15 | 1995-12-26 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | DC arc furnace |
| CN201476534U (en) * | 2009-08-31 | 2010-05-19 | 王景智 | Cover for electric arc furnace |
| CN102634635A (en) * | 2012-05-16 | 2012-08-15 | 中天钢铁集团有限公司 | Energy-saving electric furnace |
| CN102775158A (en) * | 2012-07-09 | 2012-11-14 | 郑州东方安彩耐火材料有限公司 | Ramming furnace cover of corundum electric arc furnace and production process of ramming furnace cover |
| CN209468471U (en) * | 2018-12-07 | 2019-10-08 | 河南中原特钢装备制造有限公司 | The uhp electric arc furnace pole heart justifies preform structure |
-
2021
- 2021-06-29 CN CN202110728062.4A patent/CN113390265A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479435A (en) * | 1993-04-15 | 1995-12-26 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | DC arc furnace |
| CN201476534U (en) * | 2009-08-31 | 2010-05-19 | 王景智 | Cover for electric arc furnace |
| CN102634635A (en) * | 2012-05-16 | 2012-08-15 | 中天钢铁集团有限公司 | Energy-saving electric furnace |
| CN102775158A (en) * | 2012-07-09 | 2012-11-14 | 郑州东方安彩耐火材料有限公司 | Ramming furnace cover of corundum electric arc furnace and production process of ramming furnace cover |
| CN209468471U (en) * | 2018-12-07 | 2019-10-08 | 河南中原特钢装备制造有限公司 | The uhp electric arc furnace pole heart justifies preform structure |
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Application publication date: 20210914 |
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