EP0413970B1 - Four à arc à courant continue - Google Patents

Four à arc à courant continue Download PDF

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Publication number
EP0413970B1
EP0413970B1 EP90113995A EP90113995A EP0413970B1 EP 0413970 B1 EP0413970 B1 EP 0413970B1 EP 90113995 A EP90113995 A EP 90113995A EP 90113995 A EP90113995 A EP 90113995A EP 0413970 B1 EP0413970 B1 EP 0413970B1
Authority
EP
European Patent Office
Prior art keywords
furnace
vessel
arc furnace
electric
insulating material
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.)
Expired - Lifetime
Application number
EP90113995A
Other languages
German (de)
English (en)
Other versions
EP0413970A1 (fr
Inventor
Walter Bochsler
Ante Eterovic
Sven Einar Stenkvist
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Asea Brown Boveri Ltd
Original Assignee
ABB Asea Brown Boveri Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ABB Asea Brown Boveri Ltd filed Critical ABB Asea Brown Boveri Ltd
Priority to AT90113995T priority Critical patent/ATE94716T1/de
Publication of EP0413970A1 publication Critical patent/EP0413970A1/fr
Application granted granted Critical
Publication of EP0413970B1 publication Critical patent/EP0413970B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • 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
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/08—Heating by electric discharge, e.g. arc discharge
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/06—Electrodes

Definitions

  • the invention relates to a direct current arc furnace with a furnace vessel which is provided with a metallic jacket, with at least one electrode connected as a cathode and at least one bottom contact, the bottom of the furnace consisting of a lining layer which is electrically conductive bricks or other equivalent Has inserts, which rests on a base plate, with which it forms the bottom contact connected as an anode, the bottom contact being insulated from the metallic jacket of the furnace vessel by insulating material.
  • the invention relates to a state of the art, as it results for example from US Pat. No. 4,228,314.
  • both the electrode connected as the cathode and the stove or bottom electrode, which is usually used as a contact with the ground, must B. is constructed according to US Pat. No. 4,228,314, be insulated from the metallic jacket of the furnace vessel.
  • the ground contact and the adjacent parts of the bottom lining rest on a metal plate.
  • This metal plate in turn lies on a layer of insulating material on the (metallic) bottom of the vessel.
  • the electrical connection of the bottom contact is made via contact parts which are guided through openings in the bottom of the vessel.
  • Said insulating layer is subject to high stress both by the weight of the batch and by the extreme temperatures that occur during furnace operation. Special cooling of this area is very complex.
  • the invention has for its object to provide a direct current arc furnace of the type mentioned, the ground contact is optimally insulated from the vessel jacket and the insulation withstands all operating stresses.
  • the base plate essentially forms the bottom of the vessel, which base plate projects beyond an inwardly projecting part of the metallic shell of the furnace vessel and is supported on it with the interposition of insulating or at least weakly electrically conductive material.
  • the advantage of the invention can be seen, in particular, in the fact that the entire bottom part of the arc furnace is suspended in the furnace jacket in a quasi-floating manner and the insulation of this bottom part from the furnace jacket is easy to accomplish.
  • Fig. 1 shows a direct current arc furnace with furnace vessel 1, which is provided with the usual jacket 2 made of metallic material.
  • the furnace has only one electrode 3 connected as a cathode, but this number can also be 2, three or more.
  • the electrode is hollow, ie the furnace is suitable for reduction purposes, but the subject matter of the invention can also be used in a melting furnace with a solid electrode connected as a cathode, usually a graphite electrode.
  • slurry, coke and lime are fed through the central channel 4 in the electrode, for example for pig iron production, and an electrode spot, ie a slag-free area of the melt, is obtained in the usual way under the electrode 3.
  • the furnace has a pouring spout 5 and a door hole 6.
  • the ground contact consists of bricks 8, in which metallic conductors 7 are arranged.
  • the conductors 7 penetrate an underlying floor lining layer 10, which in the example consists of electrically conductive carbon bricks.
  • the conventional furnace lining 9 connects to the outside.
  • the bricks of the floor lining layer 10 are arranged in one or more layers and lie on a bottom plate 11 shaped like a dome. This base plate 11 has a considerable extent and forms the furnace floor. It consists of steel or copper and is connected to the positive pole of the direct current source 12.
  • the contact with the ground should have a large extent so that the furnace current is spread over a large part of the ground, thereby essentially preventing the arc 13 from tilting.
  • the base plate 11 is provided with a cooling device 14 so that it can be kept at the lowest possible temperature and is not damaged by the heat of the furnace.
  • 16 is an exhaust port for exhaust gases.
  • the bricks 8 provided with conductors 7 serve as current conductors between the charge 15 and the ground contact consisting of the outer lining layer 10 and the base plate 11, which, of course, can also be designed differently. So other contact-making components can be present instead of the carbon brick.
  • the jacket 2 of the furnace vessel is now drawn radially inward and forms an inwardly projecting collar 17.
  • the base plate 11 overlaps the collar 17 in the radial direction.
  • a ring 18 made of insulating material is arranged in the overlap area. In this way, the entire bottom part of the furnace is supported on the collar 17. The bottom part of the furnace practically floats in the furnace vessel 1.
  • the electrical insulation between the furnace jacket 2 and the base plate 11 and thus the contact with the ground is accomplished via the insulating material 18.
  • the upward bent end 19 of the collar 17 serves for radial centering, but does not reach the base plate.
  • the edge part of the base plate 11 is provided with a compensation ring 20 which is approximately wedge-shaped in cross section.
  • Either finished parts e.g. B. bricks or clinker made of refractory material loosely layered on top of one another or connected to one another by refractory mortar, or a casting or ramming compound can be used.
  • the insulating material withstands the pressure loads. Furthermore, it does not have to be an isolator in the actual sense. It is sufficient if the electrical conductivity of the insulating material is at least a power of ten less than the conductivity of the ground contact in the direction of the furnace vertical axis.
  • FIG. 2 The embodiment just mentioned with casting or ramming compound is illustrated in FIG. 2 for a direct current arc furnace with a different structure of the furnace shell or bottom.
  • annular plate 21 is attached to the cylindrical shell 2.
  • An axially extending pipe section 22 is welded to the inner circumference of this plate 21.
  • the annular plate 21 corresponds to the collar 17, the tube piece 22 to the bent end 19 of the Collar 17 of Fig. 1.
  • the base plate 11 is provided in its edge region with a compensating ring, which is designed here as a welded construction and has a radially extending ring 20a and an axially extending tube piece 20b.
  • the pipe section 20b is extended downward beyond the plate 20a and welded to a support ring 23.
  • the base plate 11 together with the parts 20a, 20b and 23 are inserted before the furnace lining is introduced and are aligned and provisionally fixed by means of insulating spacers (not shown in the drawing) relative to the furnace shell 2 and the plate 21.
  • a casting or ramming mass 24, z. B. refractory concrete in the space between the vessel shell 2 and pipe section 22 and the area adjoining it upwards, in such a way that the rings 20a and 23 and the pipe section 20b are completely embedded in this mass.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Arc Welding Control (AREA)
  • Discharge Heating (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Claims (7)

  1. Four électrique à arc à courant continu comportant une cuve de four (1), qui est entourée d'une enveloppe métallique (2), avec au moins une électrode connectée comme cathode (3) et au moins un contact de sole (7, 8, 11), la sole du four se composant d'une couche de garnissage, qui se présente sous forme de briques conductrices de l'électricité ou bien d'autres éléments ayant la même fonction et qui repose sur une plaque de fond (11) avec laquelle elle constitue le contact de sole connecté comme anode, ce contact de sole étant isolé de l'enveloppe métallique (2) de la cuve du four (1) par un matériau isolant (18; 24), caractérisé en ce que la dite plaque de fond (11) forme essentiellement le fond de la cuve, s'étend au dessus d'une partie en saillie vers l'intérieur (17; 21) de l'enveloppe métallique (2) de la cuve du four (1) et s'appuie sur celle-ci par le biais d'un matériau isolant ou pour le moins faiblement conducteur (18; 24).
  2. Four à arc suivant la revendication 1, caractérisé en ce que la partie en saillie vers l'intérieur (17) est venue d'une pièce avec l'enveloppe (2) de la cuve du four.
  3. Four à arc suivant la revendication 1, caractérisé en ce que la partie en saillie vers l'intérieur est constituée d'une plaque annulaire (21) qui est fixée de manière rigide à l'extrémité inférieure de l'enveloppe.
  4. Four à arc suivant la revendication 2 ou 3, caractérisé en ce que la plaque de fond (11) est construite d'une manière approximativement en forme de calotte et est pourvue dans son domaine périphérique d'un anneau de compensation (20; 20a).
  5. Four à arc suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que le matériau isolant se compose d'éléments de construction posés librement, en particulier de briques ou de clinkers réfractaires, qui sont empilés librement ou bien liés entre eux par un mortier réfractaire.
  6. Four à arc suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que le matériau isolant est une masse à couler ou à bourrer composée d'un matériau réfractaire, en particulier de béton réfractaire.
  7. Four à arc suivant l'une quelconque des revendications 1 à 6, caractérisé en ce que la conductibilité électrique du matériau isolant est inférieure d'au moins une puissance de dix à celle du contact de sole (7, 8, 11) en direction de l'axe vertical du four.
EP90113995A 1989-08-21 1990-07-21 Four à arc à courant continue Expired - Lifetime EP0413970B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90113995T ATE94716T1 (de) 1989-08-21 1990-07-21 Gleichstromlichtbogenofen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3027/89 1989-08-21
CH3027/89A CH678785A5 (fr) 1989-08-21 1989-08-21

Publications (2)

Publication Number Publication Date
EP0413970A1 EP0413970A1 (fr) 1991-02-27
EP0413970B1 true EP0413970B1 (fr) 1993-09-15

Family

ID=4246996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90113995A Expired - Lifetime EP0413970B1 (fr) 1989-08-21 1990-07-21 Four à arc à courant continue

Country Status (12)

Country Link
EP (1) EP0413970B1 (fr)
JP (1) JPH0762585B2 (fr)
KR (1) KR0172120B1 (fr)
CN (1) CN1019141B (fr)
AT (1) ATE94716T1 (fr)
BR (1) BR9004099A (fr)
CA (1) CA2023041A1 (fr)
CH (1) CH678785A5 (fr)
DE (1) DE59002718D1 (fr)
ES (1) ES2046611T3 (fr)
RU (1) RU1784089C (fr)
ZA (1) ZA906533B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010113189A1 (fr) * 2009-03-31 2010-10-07 Sms Concast Italia S.R.L. Four électrique à arc
CN106091671A (zh) * 2016-07-12 2016-11-09 上海彭浦特种耐火材料厂有限公司 直流电弧炉底电极结构及其应用
CN107354320B (zh) * 2017-09-17 2023-06-27 贵州明峰工业废渣综合回收再利用有限公司 一种高效锌粉生产设备

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1369578A (en) * 1919-10-01 1921-02-22 Ludlum Electric Furnace Corp Electric furnace
FR670019A (fr) * 1928-06-07 1929-11-23 Perfectionnements aux fours électriques
FR2188812A5 (en) * 1972-06-09 1974-01-18 Schlienger Max Rotating electrode whell arc furnace - has arc positioning system
SE452690B (sv) * 1983-07-07 1987-12-07 Asea Ab Likstroms-ljusbagsugn
FR2577311B1 (fr) * 1985-02-11 1987-03-06 Siderurgie Fse Inst Rech Dispositif de connexion electrique destine a etre place en paroi d'un four metallurgique a courant continu.
DE3535690A1 (de) * 1985-10-05 1987-04-09 Gutehoffnungshuette Man Kontaktelektrodenanordnung fuer gleichstrom-lichtbogen- oder widerstands-schmelzofen

Also Published As

Publication number Publication date
CA2023041A1 (fr) 1991-02-22
CH678785A5 (fr) 1991-10-31
EP0413970A1 (fr) 1991-02-27
CN1019141B (zh) 1992-11-18
ES2046611T3 (es) 1994-02-01
ZA906533B (en) 1991-07-31
KR0172120B1 (ko) 1999-05-01
JPH0762585B2 (ja) 1995-07-05
CN1049714A (zh) 1991-03-06
KR910005727A (ko) 1991-03-30
ATE94716T1 (de) 1993-10-15
BR9004099A (pt) 1991-09-03
JPH0395387A (ja) 1991-04-19
DE59002718D1 (de) 1993-10-21
RU1784089C (ru) 1992-12-23

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