CN111102842A - Multi-alloy electric arc furnace cover capable of preventing electric arc breakdown - Google Patents
Multi-alloy electric arc furnace cover capable of preventing electric arc breakdown Download PDFInfo
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- CN111102842A CN111102842A CN201911395299.4A CN201911395299A CN111102842A CN 111102842 A CN111102842 A CN 111102842A CN 201911395299 A CN201911395299 A CN 201911395299A CN 111102842 A CN111102842 A CN 111102842A
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- electric arc
- furnace cover
- furnace
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
- F27B3/085—Arc furnaces
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention provides a multi-element alloy electric arc furnace cover capable of preventing electric arc breakdown, which comprises a main furnace cover, slag hanging teeth arranged at the bottom of the main furnace cover, a smoke exhaust hole arranged on one side of the edge of the main furnace cover, a prefabricated furnace cover arranged in the center of the main furnace cover and an electrode hole arranged on the prefabricated furnace cover. The slag adhering teeth are claw-shaped slag adhering teeth which are distributed at the bottom of the whole main furnace cover. After non-metal furnace dust generated in the process of smelting furnace materials by the electric arc furnace floats below the main furnace cover, the non-metal furnace dust is firmly attached to the slag hanging teeth, and the furnace dust attached to the slag hanging teeth forms an electric arc breakdown protective layer, so that the electric arc generated in the process of smelting the furnace materials by the electrodes can be effectively prevented from breaking through the main furnace cover, and the furnace cover is made of multi-element alloy materials and has the function of resisting flue gas corrosion.
Description
Technical Field
The invention relates to an electric arc furnace cover, in particular to a multi-alloy electric arc furnace cover for preventing electric arc breakdown.
Background
In the process of smelting furnace burden, the working environment of the furnace cover is quite severe, the furnace cover is mainly influenced by various factors such as electrode arc radiation, rapid cooling and rapid heating, chemical erosion of molten steel and slag, airflow impact and the like, and particularly, the electric arc generated by electrode discharge during electric furnace smelting has the largest damage to the furnace cover.
The furnace lid is exposed to high temperature radiation from the bath and the arc, and at the same time, risks arc breakdown. Due to the action of the magnetic field, when the composite furnace cover of the prior art is used, the lower part of the electrode hole ring is subjected to melting chamfering like turning, and arc breakdown is generated in a gap of an electrode hole brick in the middle of the electrode hole ring, so that the furnace cover cannot be used. The occurrence of both breakdown and melting rounding was analytically associated with "beard" around the electrode aperture. The furnace cover electrode hole ring is magnetized due to the action of the magnetic field of the magnetic mirror coil. When powder and smoke dust generated in smelting are discharged through the electrode hole, part of iron-containing dust and steel scrap powder is adsorbed around the lower end of the electrode hole ring to form 'iron beard'. When the beard grows and lengthens, the beard is connected with the electrode to form a branch loop and make arc continuously, so that the lower end of the electrode hole ring is continuously melted and a melting chamfer appears. The insulation is relative, air is broken down to become a conductor under high temperature and high pressure, the gap between the electrode hole ring and the electrode is about 600mm, and the electrode hole bricks are arranged in the middle. In the reduction period, high-temperature flue gas is discharged outwards through the electrode holes. When the position of the auxiliary material added into the furnace is improper, the voltage between the two electrodes is relatively increased at the electrode hole, at the moment, the air between the electrode hole ring and the electrodes is broken down to become a conductor under the action of high temperature and relatively high voltage, the electrodes conduct electricity and arc through the furnace cover electrode hole ring, and the furnace cover electrode hole ring is broken down to leak water.
Due to the phenomenon, the composite furnace cover cannot be used, and the furnace cover used in the prior art is a full-refractory brick furnace cover. Because the center distance of the electrodes is very short, the lintel part at the top end of the furnace cover is weak, the lintel part is most seriously heated and corroded by smoke, the damage is fastest, and the service life of the whole furnace cover is short. The molten furnace cover erosion substance scours refractory bricks of the furnace wall and enters the furnace together with a large amount of refractory bricks, so that the alkalinity of the furnace slag is reduced, the furnace slag becomes thin, arc light cannot be submerged, the arc light is exposed, the temperature is difficult to rise, and meanwhile, the exposed arc light is reflected to the furnace wall and the furnace cover by the thin slag like a mirror, so that the damage of the furnace cover and the furnace wall is aggravated. And because the electrode hole has poor air tightness and poor heat preservation performance, the time of oxidation and reduction periods is prolonged, and the loss of the furnace cover is quicker. This creates a vicious circle, resulting in a short life of the furnace lid. Even in the reduction period, the furnace cover collapses into the furnace, so that the smelting can not be carried out.
The two furnace covers of the electric arc furnace are easy to be punctured by electric arcs, and the second furnace cover is easy to be corroded by smoke. The covers of electric arc furnaces of the prior art are generally damaged and cannot be repaired after 15 uses, and must be replaced with new covers.
Therefore, the two existing furnace covers are difficult to meet the production requirements.
Disclosure of Invention
Aiming at the problems that the composite electric arc furnace cover in the prior art is easy to generate electric arc striking breakdown furnace cover, and the fireproof brick furnace cover is easy to be corroded by smoke, the invention provides the multielement alloy electric arc furnace cover capable of preventing electric arc breakdown and resisting smoke corrosion, and the service life of the electric arc furnace cover is greatly prolonged.
The technical effects of the invention are realized by the following technical scheme:
the utility model provides a prevent many first alloy electric arc furnace bell of electric arc breakdown, includes, main bell, sets up the tooth of hanging the sediment in main bell bottom, sets up the exhaust port in main bell edge one side, sets up the prefabricated bell at main bell central authorities, sets up the electrode hole on prefabricated bell.
The slag hanging teeth are claw-shaped slag hanging teeth which are distributed at the bottom of the whole main furnace cover, the non-metal furnace ash generated in the process of smelting furnace materials by the electric arc furnace is light in weight and can float below the main furnace cover, the furnace ash firmly adheres to the slag hanging teeth after floating below the main furnace cover, and the non-metal furnace ash adhered to the slag hanging teeth forms a layer of electric arc breakdown protective layer. Can effectively prevent the electric arc generated by the three-phase electrode in the process of smelting furnace materials from puncturing the furnace cover.
Furthermore, the main furnace cover is a steel furnace cover of the boiler, and the steel of the boiler has the functions of resisting the corrosion of smoke and resisting high temperature.
Furthermore, water-cooled tubes are arranged on the main furnace cover and the prefabricated furnace cover and embedded in the furnace cover.
Furthermore, lifting hooks are arranged above the main furnace cover and the prefabricated furnace cover. Because the weight of the cover body is very large, the lifting hook is arranged on the cover body, and the main furnace cover and the prefabricated furnace cover are convenient to replace and carry out other operations.
Furthermore, the electrode arranged in the electrode hole is a three-phase electrode, and the electrode is a raw material of the metal to be smelted. The electrode raw material is set as the raw material of the metal to be smelted, and in the electric furnace smelting process, along with the continuous melting of the metal electrode raw material, the length of the electrode is continuously shortened, and the molten metal drops into the metal to be smelted.
Further, the electrode installed in the electrode hole is a three-phase electrode, and the electrode is a carbon electrode or a graphite electrode. The electric arc occurs between the electrode and the charge to be melted, the charge is directly heated by the electric arc, and the length of the electric arc is adjusted by adjusting the height of the electrode.
Because the furnace cover is smooth, the furnace ash can not stay on the smooth furnace cover, after the slag hanging teeth are arranged at the bottom of the main furnace cover, the non-metal furnace ash with light weight can suspend from the furnace material, the suspended non-metal furnace ash can stably adhere to the slag hanging teeth at the bottom of the main furnace cover, and the non-metal furnace ash adhering to the slag hanging teeth forms an electric arc breakdown protective layer.
The invention has the beneficial effects that: the slag hanging teeth are fully distributed below the main furnace cover, furnace ash generated in the furnace material smelting process is attached to the slag hanging teeth to form an electric arc breakdown protective layer, so that electric arc striking phenomenon generated on the furnace cover by electric arc can be prevented from causing electric arc breakdown on the furnace cover, the furnace cover of the electric arc furnace disclosed by the invention is made of boiler steel materials, the corrosion effect of smoke on the furnace cover is resisted, the service life of the furnace cover of the electric arc furnace is prolonged from original smelting for over ten furnaces to the current one hundred or more furnaces, and the furnace cover of the electric arc furnace disclosed by the invention is not damaged.
Drawings
FIG. 1: schematic bottom view of main furnace cover of multi-component alloy arc furnace for preventing arc breakdown,
FIG. 2: a furnace cover schematic diagram of a multi-alloy electric arc furnace for preventing arc breakdown,
in the figure: the furnace comprises a main furnace cover 1, slag hanging teeth 2, a smoke exhaust hole 3, a prefabricated furnace cover 4, an electrode hole 5, a water cooling pipe 6 and a lifting hook 7.
Detailed Description
The utility model provides a prevent many first alloy electric arc furnace bell of electric arc breakdown, includes main bell 1, spreads all over and hangs sediment tooth 2 in 1 bottom of main bell, sets up the exhaust hole 3 in 1 marginal one side of main bell, sets up at 1 central prefabricated bell 4 of main bell, sets up electrode hole 5 on prefabricated bell 4, the material of main bell 1 is the boiler steel, be provided with water-cooled tube 6 on main bell 1 and the prefabricated bell 4, the water-cooled tube embedding is in the bell, main bell 1 and prefabricated bell 4 top set up promotion couple 7, it hangs the sediment tooth for the claw shape to hang sediment tooth 2, the electrode of 5 installations of electrode hole is the graphite electrode.
The furnace lid is applied to an electric arc furnace. After the electrodes are electrified, electric arcs are generated between the electrodes and furnace materials, the furnace materials are smelted through electric arc heating, furnace dust is generated in the smelting process, light-weight nonmetal furnace dust floats at the position below the main top cover 1, the floated nonmetal furnace dust is attached to the claw-shaped slag hanging teeth 2 below the main furnace cover 1, and the furnace dust attached to the slag hanging teeth 2 forms an electric arc breakdown protective layer, so that the electric arc breakdown furnace cover can be effectively prevented.
The material of the main furnace cover 1 is boiler steel, so the main furnace cover has the function of resisting smoke corrosion.
After the furnace cover of the electric arc furnace is replaced by the multielement alloy electric arc furnace cover for preventing electric arc breakdown, the electric arc furnace is smelted for more than one hundred times, and no problem occurs to the furnace cover.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not make the essence of the corresponding technical solution devulcanize the scope of the technical solution of the embodiments of the present invention.
Claims (7)
1. The utility model provides a prevent many first alloy electric arc furnace bell of electric arc breakdown which characterized in that, includes main bell (1), distributes and hangs sediment tooth (2) in main bell (1) below, sets up smoke vent (3) in main bell (1) edge one side, sets up prefabricated bell (4) in main bell (1) central authorities, sets up electrode hole (5) on prefabricated bell (4).
2. The multiple alloy electric arc furnace cover for preventing arc strike according to claim 1, wherein said main cover (1) and said preformed cover (4) are provided with cold water pipes (6).
3. Multiple alloy electric arc furnace cover for protection against arc flashovers according to claim 1, characterized in that a lifting hook (7) is provided above the main cover (1) and the pre-formed cover (4).
4. The multiple alloy electric arc furnace cover for preventing arc strike according to claim 1, wherein said main cover (1) is a boiler steel cover.
5. The multi-alloy electric arc furnace cover for preventing arc breakdown as claimed in claim 1, wherein said slag pick (2) is a claw-shaped slag pick.
6. The multiple alloy electric arc furnace cover for preventing arc breakdown as claimed in claim 1, wherein the electrode installed in said electrode hole (5) is a raw material electrode of the metal to be smelted.
7. The multiple alloy electric arc furnace cover for preventing arc breakdown as claimed in claim 1, wherein the motor installed in the electrode hole (5) is a carbon electrode or a graphite electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911395299.4A CN111102842A (en) | 2019-12-30 | 2019-12-30 | Multi-alloy electric arc furnace cover capable of preventing electric arc breakdown |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911395299.4A CN111102842A (en) | 2019-12-30 | 2019-12-30 | Multi-alloy electric arc furnace cover capable of preventing electric arc breakdown |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111102842A true CN111102842A (en) | 2020-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911395299.4A Pending CN111102842A (en) | 2019-12-30 | 2019-12-30 | Multi-alloy electric arc furnace cover capable of preventing electric arc breakdown |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111102842A (en) |
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2019
- 2019-12-30 CN CN201911395299.4A patent/CN111102842A/en active Pending
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