CN1013458B - Electromagnetic dc arc furnace with dual u-shaped bottom electrodes - Google Patents
Electromagnetic dc arc furnace with dual u-shaped bottom electrodesInfo
- Publication number
- CN1013458B CN1013458B CN 90100867 CN90100867A CN1013458B CN 1013458 B CN1013458 B CN 1013458B CN 90100867 CN90100867 CN 90100867 CN 90100867 A CN90100867 A CN 90100867A CN 1013458 B CN1013458 B CN 1013458B
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- Prior art keywords
- shaped
- furnace
- furnace bottom
- dual
- interior
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Abstract
The present invention relates to the improvement of an existing DC electric arc furnace. The present invention adopts structure with a graphite electrode and double U-shaped furnace bottom electrodes; an inner U-shaped furnace bottom is an electric furnace bottom, and an outer U-shaped furnace bottom is a furnace bottom manufactured by common fireproofing materials; the upper parts of the inner U-shaped furnace bottom and the outer U-shaped furnace bottom are connected to form an electric conducting path; electromagnetic winding loops are arranged around bottom electrodes. The present invention has the advantages of high productive efficiency, low material consumption, high metallurgy quality, energy source saving, low noise, etc., and is an ideal energy saving type electric arc furnace.
Description
The present invention is the smelting equipment of steel, ferroalloy, non-ferrous metal, is the improvement to direct current electric arc furnace.
Direct current electric arc furnace can overcome a series of shortcomings of ac arc furnace, as three-phase imbalance, noise is big, conductor is interior because alternating intense magnetic field produces eddy-current heating near the short net, the electric current kelvin effect causes that resistance increases loss and strengthens in the lead, the electric arc instability causes that voltage flicker is frequent, and power factor is low etc.After silicon power rectifier came out at the beginning of 1970's, various countries competitively developed direct current electric arc furnace.S.E stove (seeing " SEFurnace Single Electrode DC Arc Furnace Jointil developed by ASEA and KRUPP ") as Sweden ASEA and West Germany KRUPP joint research and development, the UNARC stove (seeing that " electric furnace " 1987 the 2nd phases P.31) of the common development of West Germany M.A.N/BBC, French CLECIM, Japanese NKK etc. are being devoted to the exploitation of direct current electric arc furnace (seeing that " electric furnace " 1987 the 6th phases P.34).
Above-mentioned direct current electric arc furnace all adopts bottom electrode structural, makes the interior circuit of stove form axisymmetricly, and promptly top, body of heater center one root graphite electrode connects power cathode, and the furnace bottom electricity conductive construction connects positive source, and the furnace bottom current-carrying part is called hearth electrode.
Having that the structure of hearth electrode adopts at present is following several:
1. in furnace bottom central authorities one circular port is arranged, the flange of sealing is housed below the hole, fix the plate of two levels on flange, the air guide blade resemble the turbine is housed between plate, a large amount of conductive pins is fixed on the base plate, and extend vertically upward, pass the air chamber between two plates, pass the furnace bottom refractory lining, until metal bath, the cooling air flows into cavity vertically, radially escapes through conductive pin by guide vane.Electric current enters conductive pin through the level board of bottom, passes the logical metal bath of furnace lining.
2. directly be placed on the bearth shell by a big circular copper plate.Build two to three layers of magnesia graphite brick on the copper coin, the refractory brick that is packed by steel plate again is built into and corrodes lining above, to guarantee its electric conductivity.Copper coin and water-cooled cable link, and furnace bottom is by an air conduit cooling that axial flow blower is housed.
3. the hearth electrode of French direct current stove is mounted in the steel ingot in the bottom refractory furnace lining, and water cooling is adopted in its lower end.The direct current electric arc furnace of (more than see that 1987 the 2nd phases of " electric furnace " magazine are P.32-34) above-mentioned prior art has following shortcoming:
1) can not work when hearth electrode and furnace charge loose contact;
2) can not repair with refractory material after furnace bottom burns out, can only integral replacing;
3) may wear end serious accident to furnace bottom supervision carelessness;
4) the furnace bottom heat loss is big, has reduced the thermal efficiency of stove;
5) to increase by a cover heat abstractor for reducing the hearth electrode temperature, increase investment and energy consumption.
Chinese patent 85203717.1 89104794.8 " magnetic mirror formula direct current electric arc furnace " has increased an electrode though without hearth electrode, adopt two root graphite electrodes to power to stove by what, and the consumption of graphite electrode increases, and is less economical.
The objective of the invention is to overcome existing direct current single electrode stove in that the shortcoming that exists aspect the hearth electrode is set, obtain the consumption of electrode index that bipolar electrode direct current stove can not reach simultaneously, for the extensive utilization of direct current electric arc furnace breaks a new path.
The present invention improves the furnace bottom of the direct current electric arc furnace of a root graphite electrode, the dual U-shaped bottom electrodes structure that employing is made up of inside and outside U-shaped furnace bottom, interior U-shaped furnace bottom is the conduction furnace bottom, welds steel conductive pin vertically upward on the radiant type steel plate, and is knotted into flame retardant coating with brine magnesia.At the bottom of outer U-shaped furnace bottom is conventional oven.Therefore the outer U furnace bottom of interior U does not have the anxiety of wearing end accident by the top edge steel plate formation conductive path that links together, and conductive layer and heat insulation layer upper and lower settings, significantly reduces the heat loss of furnace bottom.
The furnace shell steel plate of outer U hearth electrode of the present invention directly is communicated with positive source, so when hearth electrode and furnace charge loose contact, only need to open fire door, a horizontal rod iron on the door frame of fire door both sides, rod iron can make furnace charge and furnace shell connect to another root rod iron of stove internal frame thus again, and electrode can be worked with the furnace charge striking.After treating that metal bath surface floods hearth electrode conductive pin termination, i.e. the rod iron of dismountable temporary erection.
The present invention is provided with solenoid around hearth electrode, energising can produce high-intensity magnetic field when repairing furnace bottom, the steel conductive pin that is thrown into is aligned with old pin automatically, make the refractory masses of spray repair still have the favorable conductive structure, new and old pin energising can weld voluntarily during melting or melting together, contactless bad anxiety.Solenoid adopts water-cooling structure, except that guaranteeing the coil heat radiation, still can reduce the temperature of hearth electrode, makes the hearth electrode operate as normal.
The above-mentioned solenoid that the present invention is provided with, high-intensity magnetic field that energising produces when refining and the DC current effect in the molten bath, can produce very strong mixing power, molten metal is rotated around the stove heart, quicken metallurgical reaction, shorten the heat, guarantee that bath temperature is even, the product uniform ingredients, exempt and stir the hard working of skimming.
The above-mentioned solenoid that the present invention is provided with, energising has downward suction to steel scrap in melting stage, can reduce the scaffold phenomenon, and can force electric arc rotation expansion to wear the well fusion range, improves the heat exchanger effectiveness of electric arc and furnace charge, quickens the furnace charge fusing.
Advantages such as the present invention has the production efficiency height, refractory consumption rate is few, metallurgical quality is high, the energy is economized, noise is little are comparatively ideal energy-saving electric arc furnaces.
The present invention can be illustrated by following embodiment.
Fig. 1 is a kind of total figure of electromagnetic DC arc furnace with dual U-shaped bottom electrodes.
Fig. 2 is the oven body part side cutaway view.The double accompanying drawing that makes an abstract.
Three-phase high-voltage power supply (1) is connected with the primary side of furnace transformer (4) through isolating switch (2) and vacuum circuit breaker (3), the secondary side of furnace transformer is whole for direct current alternating current through silicon rectifier device (5), powers to electromagnetic DC arc furnace with dual U-shaped bottom electrodes.Power cathode joins by the graphite electrode (10) of electrode jaw (9) with top, stove center, passes bell (11) and enters in the stove, and positive source is connected with outer U-shaped furnace shell (16) by soft copper cable (8), hearth electrode terminal plate (18).Outer U-shaped furnace bottom is common bottom structure, is made up of magnesia brick layer (14) and heat insulation packed layer (15).Interior U-shaped bearth shell (17) and outer U-shaped bearth shell (16) arrange that up and down its top edge links together with steel plate, constitute conductive path.Radiant type steel plate and welding steel conductive pin (12) vertically upward are housed on interior U-shaped bearth shell (17), are knotted into flame retardant coating (13) with brine magnesia around the conductive pin.Around hearth electrode water-cooled electromagnetic coil (7) is housed, provides exciting curent to it by dc source (6).
Description of drawings:
1-three-phase ac high voltage source 2-isolating switch 3-vacuum circuit breaker device
4-electric arc furnaces transformer 5-silicon rectifier device 6-dc source
7-solenoid 8-soft copper cable 9-electrode jaw
10-graphite electrode 11-bell 12-conductive pin
The heat insulation packed layer of 13-knotting flame retardant coating 14-magnesia brick layer 15-
U bearth shell 18-hearth electrode terminal plate in the outer U bearth shell 17-of 16-
Claims (4)
1, be used to smelt steel, ferroalloy, the electromagnetic DC arc furnace with dual U-shaped bottom electrodes of non-ferrous metal, its main circuit is that the three-phase high-voltage power supply is connected through the primary side of isolating switch and vacuum circuit breaker and furnace transformer, the secondary side of furnace transformer is put in order alternating current through silicon rectifier device and is direct current, dc power cathode connects the graphite electrode of top, stove center, dc power anode connects hearth electrode, it is characterized in that described hearth electrode is by interior, the dual U-shaped bottom electrodes that outer U-shaped furnace bottom is formed, interior U-shaped furnace bottom is the conduction furnace bottom, outer U-shaped furnace bottom is the common refractory furnace bottom, interior U-shaped furnace bottom and outer U-shaped furnace bottom are arranged up and down, its top links together with steel plate, constitute conductive path, steel conductive pin is vertically upward arranged on the interior U-shaped bearth shell, tie a knot with refractory material around the conductive pin, around outer U hearth electrode solenoid is housed, solenoid is connected with dc source.
2,, it is characterized in that described conductive pin is on the radial steel plate that is welded on the interior U-shaped bearth shell according to the described electromagnetic DC arc furnace with dual U-shaped bottom electrodes of claim 1.
3,, it is characterized in that the refractory material around the described conductive pin is to be knotted into flame retardant coating with brine magnesia according to the described electromagnetic DC arc furnace with dual U-shaped bottom electrodes of claim 1.
4,, it is characterized in that described solenoid is the water-cooled solenoid according to the described electromagnetic DC arc furnace with dual U-shaped bottom electrodes of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90100867 CN1013458B (en) | 1990-02-20 | 1990-02-20 | Electromagnetic dc arc furnace with dual u-shaped bottom electrodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90100867 CN1013458B (en) | 1990-02-20 | 1990-02-20 | Electromagnetic dc arc furnace with dual u-shaped bottom electrodes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1044851A CN1044851A (en) | 1990-08-22 |
| CN1013458B true CN1013458B (en) | 1991-08-07 |
Family
ID=4876839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90100867 Expired CN1013458B (en) | 1990-02-20 | 1990-02-20 | Electromagnetic dc arc furnace with dual u-shaped bottom electrodes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013458B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451514C (en) * | 2005-06-30 | 2009-01-14 | 东北大学 | DC arc induction furnace |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004177A (en) * | 2015-07-03 | 2015-10-28 | 河南东风新研材科技有限公司 | Single-electrode DC corundum smelting equipment |
| CN115751961B (en) * | 2022-11-17 | 2023-05-12 | 辽宁中镁控股股份有限公司 | Preparation method and combination mode of conductive refractory material for direct-current mining furnace |
-
1990
- 1990-02-20 CN CN 90100867 patent/CN1013458B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451514C (en) * | 2005-06-30 | 2009-01-14 | 东北大学 | DC arc induction furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1044851A (en) | 1990-08-22 |
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| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |