CN215337729U - Central prefabricated member for water-cooled furnace cover of ultrahigh power electric arc furnace - Google Patents

Central prefabricated member for water-cooled furnace cover of ultrahigh power electric arc furnace Download PDF

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CN215337729U
CN215337729U CN202121461703.6U CN202121461703U CN215337729U CN 215337729 U CN215337729 U CN 215337729U CN 202121461703 U CN202121461703 U CN 202121461703U CN 215337729 U CN215337729 U CN 215337729U
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end surface
center
electric arc
power electric
water
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闫抒宇
张一�
李刚
刘立鹤
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Shanghai Electric Shmp Casting & Forging Co ltd
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Shanghai Electric Shmp Casting & Forging Co ltd
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Abstract

The utility model discloses a central prefabricated part of a water-cooled furnace cover of an ultrahigh-power electric arc furnace, which comprises an upper end surface and a lower end surface which are oppositely arranged up and down along a central line, wherein the upper end surface and the lower end surface are similar bow-shaped, the 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 utility model 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

Central prefabricated member for water-cooled furnace cover of ultrahigh power electric arc furnace
Technical Field
The utility model 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.
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, in view of the above problems, it is necessary to propose a further solution to solve at least one technical problem.
SUMMERY OF THE UTILITY MODEL
The utility model 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 utility model is as follows:
a central prefabricated part of a water-cooled furnace cover of an ultrahigh-power electric arc furnace comprises an upper end surface and a lower end surface which are oppositely arranged up and down along a central line, wherein the upper end surface and the lower end surface are similar bow-shaped, the 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 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.
Preferably, the minimum distance between the upper end face and the lower end face is not less than 300 mm.
Preferably, 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.
Preferably, the angle of inclination a of the chamfer with respect to the horizontal is between 100 ° and 120 °.
Preferably, the central prefabricated member is vertically provided with three electrode holes in a penetrating manner from the upper end face to the lower end face, and the three electrode holes are distributed at an angle of 120 degrees by taking the circle center of the central prefabricated member as the center.
Preferably, the spherical radius is 6-6.5 times the base diameter.
Preferably, the upper end surface is provided with three lifting tabs, the three lifting tabs are distributed in an angle of 120 degrees by taking the circle center of the central prefabricated member as the center, and the lifting tabs are arranged between two adjacent electrode holes.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, 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 the traditional central prefabricated member, the use safety of the central prefabricated member is further improved, the service life is more than or equal to 60 heats, the service life is prolonged compared with the traditional central prefabricated member, 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 utility model;
FIG. 4 is a schematic side view of a central preform of a water-cooled roof of an electric arc furnace according to the utility model.
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.
Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the utility model 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 utility model is related. Accordingly, the use of "about" to modify a numerical value means that the utility model 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 center preform of a water cooled furnace lid of an ultra high power electric arc furnace 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 surfaceThe end faces 12 are similarly arcuate, i.e. the upper end face 11 and the lower end face 12 are 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 face 12 of the spherical crown face can improve the overall strength performance of the central prefabricated member, and particularly, the circle center of the spherical crown face is located right below the circle center of the lower end face, so that a similar arch bridge structure is formed, and the overall strength of the central prefabricated member 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 upper end surface 11 is vertically extended to the lower end surface 12 by a vertical surface 13 to increase the distance between the upper end surface 11 and the lower end surface 12, that is, to increase the thickness of the central preform, thereby reducing the safety risk caused by rapid thickness reduction due to arc light radiation and molten steel splash erosion, prolonging the service life of the central preform, and further, increasing the service life of the central preformThe maintenance cost of the electric arc furnace and the production cost of steel are reduced. 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.
Vertical face 13 that corresponds 11 chord parts of up end extends to lower terminal surface 12 and is connected with scarf 15 to with the fire door cooperation direction, do benefit to central prefab and slide to accurate position by fire door and 15 cooperations of scarf, realize accurate installation, and then improve and seal the effect. Meanwhile, the inclined plane 15 is arranged close to the smoke outlet direction to reserve space for the dust removing equipment. Preferably, the chamfer 15 is inclined at an angle α of 100 ° to 120 ° to the horizontal, in this embodiment 111 °.
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, electricityPole hole 20 diameter d20Slightly 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.
In conclusion, the upper end surface, the lower end surface, the vertical surface and the conical surface are matched, the size of the center prefabricated part is optimized compared with that of a traditional center prefabricated part, the use safety of the center prefabricated part is further improved, the service life of the center prefabricated part is longer than or equal to 60 heats, the service life of the center prefabricated part is prolonged compared with that of the traditional center prefabricated part, and meanwhile the furnace cover maintenance cost and the steel production cost are reduced.
It will be evident to those skilled in the art that the utility model 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 utility model 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 (7)

1. The central prefabricated member of the water-cooled furnace cover of the ultrahigh-power electric arc furnace is characterized by comprising an upper end surface and a lower end surface which are oppositely arranged up and down along a central line, wherein the upper end surface and the lower end surface are similar bow-shaped, the 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 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 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.
6. The ultra-high power electric arc furnace water-cooled roof center preform of claim 3, wherein the radius of the sphere is 6-6.5 times the diameter of the base.
7. The prefabricated member for the water-cooled furnace cover center of an ultra-high power electric arc furnace as claimed in claim 5, wherein three lifting tabs are arranged on the upper end surface, are distributed at 120 degrees around the center of the prefabricated member, and are arranged between two adjacent electrode holes.
CN202121461703.6U 2021-06-29 2021-06-29 Central prefabricated member for water-cooled furnace cover of ultrahigh power electric arc furnace Active CN215337729U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121461703.6U CN215337729U (en) 2021-06-29 2021-06-29 Central prefabricated member for water-cooled furnace cover of ultrahigh power electric arc furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121461703.6U CN215337729U (en) 2021-06-29 2021-06-29 Central prefabricated member for water-cooled furnace cover of ultrahigh power electric arc furnace

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Publication Number Publication Date
CN215337729U true CN215337729U (en) 2021-12-28

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