CN110551872A - device for smelting low-nitrogen steel grade in electric arc furnace - Google Patents
device for smelting low-nitrogen steel grade in electric arc furnace Download PDFInfo
- Publication number
- CN110551872A CN110551872A CN201910932874.3A CN201910932874A CN110551872A CN 110551872 A CN110551872 A CN 110551872A CN 201910932874 A CN201910932874 A CN 201910932874A CN 110551872 A CN110551872 A CN 110551872A
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- CN
- China
- Prior art keywords
- electrode
- pipeline
- inert gas
- electric arc
- conveying loop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 23
- 238000010891 electric arc Methods 0.000 title claims abstract description 23
- 239000010959 steel Substances 0.000 title claims abstract description 23
- 238000003723 Smelting Methods 0.000 title claims abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 20
- 239000011261 inert gas Substances 0.000 claims abstract description 30
- 238000009413 insulation Methods 0.000 claims abstract description 11
- 238000002955 isolation Methods 0.000 claims abstract description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 36
- 229910052786 argon Inorganic materials 0.000 claims description 18
- 238000010494 dissociation reaction Methods 0.000 abstract description 3
- 230000005593 dissociations Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009845 electric arc furnace steelmaking Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention discloses a device for smelting low-nitrogen steel by an electric arc furnace, which comprises an inert gas control valve station, an inert gas conveying loop, a pipeline insulating and isolating support, a flexible telescopic pipeline, an electrode pipeline connector, an electrode clamping ring, a conductive cross arm and a hollow electrode, wherein the inert gas control valve station is arranged on the upper end of the inert gas conveying loop; the electrode clamping ring is arranged at one end of the conductive cross arm, the electrode clamping ring clamps the hollow electrode, the pipeline insulation isolation support is arranged on the conductive cross arm, the inert gas conveying loop is placed on the pipeline insulation isolation support, one end of the inert gas conveying loop is communicated with the inert gas control valve station, the other end of the inert gas conveying loop is communicated with the flexible telescopic pipeline, and the flexible telescopic pipeline is communicated with the hollow electrode through an electrode pipeline connector. The invention avoids the phenomenon of nitrogen increase of molten steel caused by air dissociation through high-temperature electric arc.
Description
Technical Field
The invention belongs to novel process equipment for smelting low-nitrogen steel by an electric arc furnace, and particularly relates to a production process device for smelting low-nitrogen steel by the electric arc furnace.
Background
Because of the smelting characteristics of an electric arc furnace and an LF ladle refining furnace, electric energy needs to be transmitted through ultrahigh power electrode discharge in the smelting process, molten steel in an electric arc action area cannot be effectively covered by slag under the action of impact power of electric arc, and peripheral air is dissociated by strong electric arc, so that the molten steel is combined with nitrogen in ionized air, and serious nitrogen increase is caused to the molten steel.
Disclosure of Invention
The invention aims to provide a set of production process device for smelting low-nitrogen steel by an electric arc furnace, and realizes safe, low-cost and reliable operation by various insulation protection measures of a gas path conveying device and a large current device, and the on-off conveying of inert argon can be completely automatically controlled.
In order to achieve the purpose, the invention adopts the following technical scheme:
A device for smelting low-nitrogen steel by an electric arc furnace comprises an inert gas control valve station, an inert gas conveying loop, a pipeline insulating and isolating support, a flexible telescopic pipeline, an electrode pipeline connector, an electrode clamping ring, a conductive cross arm and a hollow electrode;
The electrode clamping ring is arranged at one end of the conductive cross arm, the electrode clamping ring clamps the hollow electrode, the pipeline insulation isolation support is arranged on the conductive cross arm, the inert gas conveying loop is placed on the pipeline insulation isolation support, one end of the inert gas conveying loop is communicated with the inert gas control valve station, the other end of the inert gas conveying loop is communicated with the flexible telescopic pipeline, and the flexible telescopic pipeline is communicated with the hollow electrode through an electrode pipeline connector.
Preferably, the inert gas is argon.
Preferably, the hollow electrode is an ultrahigh power hollow electrode or a high power hollow electrode.
The invention realizes the function of continuously conveying the inert argon to the arc area through the set of gas control loop. Controlling argon pressure and input flow, and establishing the argon on-off linkage relation in the smelting process.
The flexible telescopic communicating pipe has insulating and servo telescopic pipeline material, and the electrode pipeline connector has leakage preventing sealing device and no magnetic conduction.
The invention has the beneficial effects that:
1. And (5) starting smelting. When the electrode of the electric arc furnace or the LF ladle refining furnace is commanded to start and descend for smelting, the control valve of the argon valve station is commanded to open, and inert argon is input according to a flow model through the opening proportion of the regulating valve.
2. The heavy current device and the conveying pipeline are connected in parallel for operation. Because the argon conveying pipeline runs in a high-current and high-intensity magnetic field area, in order to obtain safe and reliable running effects, the insulation of the device needs to have sufficient redundancy, and the hard pipeline needs to be made of non-magnetic materials.
3. A flexible hose. The electrode length needs to be adjusted intermittently along with the smelting process, and the flexible hose stretches and retracts in a follow-up mode to adapt to the appropriate length, so that the gas transmission amount is not influenced, and the service life of a pipeline is not influenced.
4. and finishing smelting. When the smelting is finished, the device is powered off, and the argon control valve is closed in a delayed mode along with the transmission of the electrode lifting signal, so that the liquid level of the molten steel is fully protected.
The low-nitrogen production process is applied to the electric arc furnace steelmaking and LF ladle refining furnace devices, can effectively solve the problem of nitrogen increase of molten steel caused by air dissociation of smelting electric arc, obviously reduces electrode consumption, and effectively improves the hit rate of the electric arc furnace device for producing low-nitrogen steel. The ultra-high power hollow electrode is used for opening the inert argon conveying channel, so that the continuous injection of inert argon in the smelting process is realized, the diffused inert argon covers the exposed molten steel liquid level, and the air in the electric arc action range is isolated, so that the phenomenon of nitrogen increase of the molten steel caused by air dissociation through high-temperature electric arc is avoided.
Drawings
FIG. 1 is a structural composition of a device for smelting low-nitrogen steel grade in an electric arc furnace;
Reference numerals: 1-an inert gas control valve station; 2-an inert gas delivery circuit; 3-pipeline insulation isolation support; 4-flexible and telescopic pipelines; 5-electrode line connectors; 6-electrode looping; 7-a conductive cross arm; 8-high power hollow electrodes; 9-inert argon flow; 10-liquid level.
Detailed Description
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. Unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features. The description is only for the purpose of facilitating understanding of the present invention and should not be construed as specifically limiting the present invention.
The invention is described in further detail below with reference to the figures and the detailed description.
Example 1
As shown in fig. 1, the device for smelting low-nitrogen steel in the electric arc furnace comprises an inert gas control valve station 1, an inert gas conveying loop 2, a pipeline insulating and isolating support 3, a flexible telescopic pipeline 4, an electrode pipeline connector 5, an electrode clamping ring 6, a conductive cross arm 7 and a hollow electrode 8;
The electrode clamping ring is arranged at one end of the conductive cross arm 7, the electrode clamping ring 6 clamps the hollow electrode 8, the pipeline insulation isolation support 3 is arranged on the conductive cross arm 7, the inert gas conveying loop 2 is placed on the pipeline insulation isolation support 3, one end of the inert gas conveying loop 2 is communicated with the inert gas control valve station 1, the other end of the inert gas conveying loop is communicated with the flexible telescopic pipeline 4, and the flexible telescopic pipeline 4 is communicated with the hollow electrode 8 through the electrode pipeline connector 5.
The inert gas is argon.
The hollow electrode 8 is an ultrahigh power hollow electrode.
According to the production process device, the ultrahigh-power hollow electrode is a core component for conveying inert argon to an electric arc area, and when the argon control valve station obtains a corresponding instruction, in the descending process of the ultrahigh-power hollow electrode, an inert argon gas flow 9 reaches the electric arc area (close to the liquid level 10 of molten steel smelting) along a conveying pipeline to drive away diffused air at the part, then most of nitrogen gas is driven away from the area, the environment of ionizing air to increase nitrogen is destroyed, and therefore the protective atmosphere of producing low-nitrogen steel by electric furnace steel is achieved.
Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. The device for smelting the low-nitrogen steel grade in the electric arc furnace is characterized by comprising an inert gas control valve station (1), an inert gas conveying loop (2), a pipeline insulating and isolating support (3), a flexible telescopic pipeline (4), an electrode pipeline connector (5), an electrode embracing ring (6), a conductive cross arm (7) and a hollow electrode (8);
Conductive xarm (7) one end sets up electrode embracing ring (6), electrode embracing ring (6) centre gripping hollow electrode (8), pipeline insulation isolation support (3) set up on conductive xarm (7), place inert gas conveying loop (2) on pipeline insulation isolation support (3), the one end and the inert gas control valve station (1) intercommunication of inert gas conveying loop (2), the other end and flexible scalable pipeline (4) intercommunication, flexible scalable pipeline (4) communicate in hollow electrode (8) through electrode pipeline connector (5).
2. The apparatus of claim 1, wherein the inert gas is argon.
3. The apparatus for electric arc furnace smelting of low nitrogen grade steel according to claim 1, characterized in that the hollow electrode (8) is an ultra high power hollow electrode or a high power hollow electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910932874.3A CN110551872A (en) | 2019-09-29 | 2019-09-29 | device for smelting low-nitrogen steel grade in electric arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910932874.3A CN110551872A (en) | 2019-09-29 | 2019-09-29 | device for smelting low-nitrogen steel grade in electric arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110551872A true CN110551872A (en) | 2019-12-10 |
Family
ID=68741798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910932874.3A Pending CN110551872A (en) | 2019-09-29 | 2019-09-29 | device for smelting low-nitrogen steel grade in electric arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110551872A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0203533A2 (en) * | 1985-05-29 | 1986-12-03 | Nippon Kokan Kabushiki Kaisha | Method of heating molten steel by arc process |
| US5332197A (en) * | 1992-11-02 | 1994-07-26 | General Electric Company | Electroslag refining or titanium to achieve low nitrogen |
| CN101191171A (en) * | 2006-11-24 | 2008-06-04 | 宝山钢铁股份有限公司 | Method for processing ultra-pure ferrite stainless steel by using ladle refining furnace to control carbon and nitrogen content |
| CN202658180U (en) * | 2012-03-31 | 2013-01-09 | 河北钢铁集团有限公司 | Refining device for smelting low-nitrogen steel and high-nitrogen steel by Ar/N2 plasma source |
| CN103993132A (en) * | 2014-05-30 | 2014-08-20 | 河北钢铁股份有限公司 | Method for refining low-nitrogen steel by ladle refining furnace (LF) |
| CN211035983U (en) * | 2019-09-29 | 2020-07-17 | 山东钢铁股份有限公司 | Device for smelting low-nitrogen steel grade in electric arc furnace |
-
2019
- 2019-09-29 CN CN201910932874.3A patent/CN110551872A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0203533A2 (en) * | 1985-05-29 | 1986-12-03 | Nippon Kokan Kabushiki Kaisha | Method of heating molten steel by arc process |
| US5332197A (en) * | 1992-11-02 | 1994-07-26 | General Electric Company | Electroslag refining or titanium to achieve low nitrogen |
| CN101191171A (en) * | 2006-11-24 | 2008-06-04 | 宝山钢铁股份有限公司 | Method for processing ultra-pure ferrite stainless steel by using ladle refining furnace to control carbon and nitrogen content |
| CN202658180U (en) * | 2012-03-31 | 2013-01-09 | 河北钢铁集团有限公司 | Refining device for smelting low-nitrogen steel and high-nitrogen steel by Ar/N2 plasma source |
| CN103993132A (en) * | 2014-05-30 | 2014-08-20 | 河北钢铁股份有限公司 | Method for refining low-nitrogen steel by ladle refining furnace (LF) |
| CN211035983U (en) * | 2019-09-29 | 2020-07-17 | 山东钢铁股份有限公司 | Device for smelting low-nitrogen steel grade in electric arc furnace |
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