EP0671116B1 - Dispositif pour la fusion electrique - Google Patents

Dispositif pour la fusion electrique Download PDF

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Publication number
EP0671116B1
EP0671116B1 EP94928439A EP94928439A EP0671116B1 EP 0671116 B1 EP0671116 B1 EP 0671116B1 EP 94928439 A EP94928439 A EP 94928439A EP 94928439 A EP94928439 A EP 94928439A EP 0671116 B1 EP0671116 B1 EP 0671116B1
Authority
EP
European Patent Office
Prior art keywords
support
electrode
cooling system
current
water
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
EP94928439A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0671116A1 (fr
Inventor
Gérard Delahalle
Stéphane Maugendre
Thierry Caillaud
Pierre Peigne
François Szalata
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.)
Saint Gobain Isover SA France
Original Assignee
Saint Gobain Isover SA France
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 Saint Gobain Isover SA France filed Critical Saint Gobain Isover SA France
Publication of EP0671116A1 publication Critical patent/EP0671116A1/fr
Application granted granted Critical
Publication of EP0671116B1 publication Critical patent/EP0671116B1/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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/03—Electrodes

Definitions

  • the invention relates to fusion techniques electric and relates more particularly to those in which energy is dissipated by Joule effect in the melt from plunging electrodes.
  • immersion of electrodes also allows a convenient and well uniform feeding of the surface of the bath in composition of raw materials.
  • the constitution of a relatively thick layer of composition to melt, supernatant on the molten bath, is useful in effect for several reasons. It forms, in contact with the molten bath, the permanent reserve of necessary material in continuous operation. It also protects the bath by fusion of a high heat loss by convection in contact with the atmosphere and especially by radiation.
  • ovens of the type described in the aforementioned document find very important industrial applications, they do not necessarily make it possible to respond at best to all the requirements encountered in practice.
  • transform facilities operating with burners keeping as much of the existing elements as possible and in particular the refractory materials constituting The Pelvis Such a transformation is not possible when it comes to implanting electrodes in the sole or in the side walls of the oven.
  • Ovens with submerged electrodes provide limited possibilities for adjusting the electrodes. If they lead to entirely satisfactory performance for a certain diet, they are less suitable for frequent and / or substantial changes to this plan Operating.
  • the plunging electrode technique locates the hottest areas at the top of the melt and thus alleviates these problems.
  • this technique makes it possible to modify the electrode immersion depth and therefore the gradient of temperature. This allows changes from the oven without changing the temperature of the hearth and therefore the temperature of the glass leaving the oven.
  • the arm temperature becomes very high and causes degradation of the power supply system.
  • a usual solution consists of a standby phase to be noted the plunging electrodes and to maintain a temperature sufficient in the bath by immersed electrodes the more often placed on the walls.
  • This technique is effective but we find the problems related to the electrodes submerged although in this case they work under lower voltages since they only maintain the temperature of the bath already melted. Over such submerged electrodes require investment costs additional.
  • Such a device most often consists of a wire mesh that prevents employees from accessing the oven.
  • EP-A-0 135 473 describes an arc furnace electrode support, said support comprising a current supply system and a cooling device, in which the support has a surface protection thermal and said surface is insulated from the voltage of the conductor current.
  • the object of the invention is a device for fusion vitrifiable charge electric which acts either in regime normal operation, either in standby period without the intervention of submerged and safe electrodes for the operators.
  • the electrode holder according to claim 1 satisfies the problems posed by prior techniques. Indeed, there is more risk for operators linked to maintaining electrode supply voltage. And, during a bet in standby of the melting furnace, the rise in temperature due especially the radiation of the molten glass bath does not not the degradation of the support since it has a thermally insulated surface.
  • the system power supply is a cooling system, "water-jacket" type conductor of electric current.
  • This device is then surrounded by an electrical insulator, advantageously made of a material resistant to temperatures very high.
  • the insulation that is chosen to withstand temperatures is advantageously cooled by traffic conductive cooling system water current.
  • the invention advantageously proposes to surround the electrical insulation of a second cooling system of the "water-jacket" type. It is thus possible to choose a material for electrical insulation resistant to temperatures lower. In addition, such a material generally sees its electrical insulation properties improve at low temperature.
  • the electrode support thus proposed therefore comprises two cooling systems. Cooling systems are advantageously made by circulation of water.
  • the internal system being current conductor invention for supplying the electrode, the invention provides two separate water circulation circuits so that the current conducting water and flowing in the cooling system supplying the electrode does not bring a tension on the level of the second system of cooling which would then no longer be useful.
  • the two cooling systems are powered by the same water circuit, the water being demineralized so that it either non-conductive.
  • the feeding device water outside the electrode holder can be limited to a single circuit.
  • FIG. 1 shows part of a melting furnace associated with plunging electrodes 1.
  • the oven is constituted by a refractory tank composed of the sole 2 and side walls 3.
  • the refractory vault 4 is suspended from a metal frame 5 partially shown, said metal frame 5 overlapping the oven.
  • Mobile refractory walls 6 are provided which when they are in the low position, i.e. in support on the side walls 3, allow to partially isolate the molten bath 7 of the surrounding atmosphere.
  • electrode 1 it is submerged on the surface of the melt 7 under the layer 9 of materials first to melt.
  • This layer 9 which covers the weld pool 7 in normal operating mode, isolates thermally the pelvis and avoids losses thermal.
  • the electrode 1 is fixed to the support 8 which includes the power supply system and cooling device of electrode 1, which are not shown in this figure 1.
  • the support 8 is itself connected to a non-mechanism shown which allows in particular to remove an electrode 1 bath for example for a change or a repair.
  • the electrode 1 and its support 8 are more precisely represented and highlight the advantages of the invention.
  • Element 10 is an extension which is fixed to the tube 11 by screwing. At the other end of this extension 10, the electrode 1 is fixed. construction allows the assembly to be easily dismantled extension 10 / electrode 1 because the place of screwing does not never soak in the melt. Indeed, if the tube 11 was longer and dipped directly into the bath, it would be possible to directly attach electrode 1 on it for example by screwing. However, it would become much more difficult to disassemble the electrode, the attachment point having soaked in the bath of fusion. According to our setup, the change is very easy but still needs to replace the extension 10 together with the electrode 1.
  • This extension 10 can be surrounded, at least partially, by a refractory material thick enough to avoid direct contact with raw materials or the molten bath.
  • the extension 10 also allows the passage coolant to the electrode so so that it is cooled.
  • Screw fixing is interesting because it allows quick replacement. Electrode replacements can be frequent because they do not intervene only in case of wear but also allow modification the electrodes and in particular their length so as to modify the level of immersion and therefore the energy intake in the oven.
  • the tube 11 can be made of steel of so that it has good stiffness and conduction.
  • a second tube 12 is placed, for example concentric.
  • This second tube 12 is for example fixed at different points to the internal surface of the tube 11.
  • the association of these two tubes 11 and 12 allows circulation of water and thus constitutes a cooling device water-jacket type.
  • the cooling system being designed so as to cool the electrode 1, the tube 12 passes through the extension 10.
  • a collar 13 supply for example of copper itself placed within an insulating formwork 14. This collar 13 makes it possible to put the tube 11 at the desired tension, and this one being electrical conductor to power electrode 1 under this same tension.
  • an insulating material 15 electrically advantageously made of a refractory material the type of electrical insulation sold under the reference MURATHERM 500 M.
  • Material 15 is produced under form of one or more sleeves which wrap and are supported on a part of the external surface of the tube 11. This electrical insulating material therefore allows accessibility to the electrode holder without any risk of electric shock for operators who must approach the bath of fusion.
  • the material 15 is itself surrounded by an envelope 16 concentric in which circulates a liquid of cooling such as water.
  • This envelope 16 of "water-jacket" type includes an internal sleeve 17 which allows the circulation of water.
  • This second cooling device allows a part of avoiding overheating of the insulating material even if it is chosen as being able to withstand temperatures quite high and if it is already partly cooled by the first cooling system.
  • the electrode holder 8 which remains relatively cold and can allow manipulation or at least approach by an operator even when the oven is on standby and support 8 is heated mainly by radiation from the melt where layer 9 of raw material is absent.
  • the different elements cited 11, 12, 15, 16, 17 constitute tubes, for example, concentric, placed around each other.
  • a cooling device "water-jacket" type, current conductor consisting of two concentric tubes 18, 19 is surrounded one or more sleeves 20 of an electrical insulating material and having good thermal insulation and good temperature resistance.
  • Thermal protection of the support surface electrode is then obtained on the one hand, by nature even of the sleeve 20 and on the other hand, by the presence of the device cooling which allows to cool this sleeve 20.
  • the water used for cooling is advantageously demineralized water, which makes it possible to use the same circuits for both cooling systems without risk of current conduction to the system external cooling, which is also connected to the Earth.
  • the unnumbered arrows indicate the different circuits followed by the coolant.
  • the electrode associated with its support thus described according to the invention allows on the one hand a safe use in normal operating mode since no device accessible is powered up and secondly use without risk of degradation of the support when the oven is put on hold.
  • the device composed of the electrode and its support according to the invention therefore makes it possible to keep the different advantages linked to electric fusion by submerged electrode from the surface of the melt, which have been listed previously.
  • These are, for example, vouchers thermal yields, good material quality melted despite changes in draw, increase life of the oven because the refractories are less attacked or because it is easy to change an electrode.
  • the device according to the invention allows avoid the presence of fully submerged electrodes to night light periods or full-time attendance a protection system avoiding the presence of operators near continuously energized components.

Landscapes

  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Resistance Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Discharge Heating (AREA)
EP94928439A 1993-09-30 1994-09-27 Dispositif pour la fusion electrique Expired - Lifetime EP0671116B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9311679 1993-09-30
FR9311679 1993-09-30
PCT/FR1994/001124 WO1995009518A1 (fr) 1993-09-30 1994-09-27 Dispositif pour la fusion electrique

Publications (2)

Publication Number Publication Date
EP0671116A1 EP0671116A1 (fr) 1995-09-13
EP0671116B1 true EP0671116B1 (fr) 2003-07-02

Family

ID=9451431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94928439A Expired - Lifetime EP0671116B1 (fr) 1993-09-30 1994-09-27 Dispositif pour la fusion electrique

Country Status (14)

Country Link
US (1) US5596598A (xx)
EP (1) EP0671116B1 (xx)
JP (1) JP3655308B2 (xx)
KR (1) KR100391193B1 (xx)
CN (1) CN1054960C (xx)
BR (1) BR9405619A (xx)
CA (1) CA2150236A1 (xx)
DE (1) DE69432892T2 (xx)
DK (1) DK0671116T3 (xx)
ES (1) ES2202328T3 (xx)
FI (1) FI952603A (xx)
NO (1) NO313170B1 (xx)
WO (1) WO1995009518A1 (xx)
ZA (1) ZA947131B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024105247A1 (fr) 2022-11-18 2024-05-23 Saint-Gobain Isover Four verrier électrique

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2741227A1 (fr) * 1995-11-14 1997-05-16 Verrerie & Cristallerie Electrode, notamment destinee a etre utilisee dans des fours de fusion du verre
US6377604B1 (en) 2000-11-09 2002-04-23 Dixie Arc, Inc. Current-conducting arm for an electric arc furnace
JP2010238639A (ja) * 2009-03-31 2010-10-21 Frontier Engineering Co Ltd 冷媒管、電極体および連続式通電加熱装置
US8743926B2 (en) * 2010-08-10 2014-06-03 H.C. Starck Inc. Liquid cooled glass metal electrode
CN104136849A (zh) * 2012-02-22 2014-11-05 克利尔赛恩燃烧公司 冷却电极以及包含冷却电极的燃烧器系统

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599179A (en) * 1949-07-14 1952-06-03 Kellogg M W Co Furnace electrode
US3327040A (en) * 1963-08-07 1967-06-20 Exxon Research Engineering Co Electrode installation
US4477911A (en) * 1982-12-02 1984-10-16 Westinghouse Electric Corp. Integral heat pipe-electrode
EP0135473A1 (en) * 1983-08-13 1985-03-27 Arc Technologies Systems, Ltd. Electrode assembly for arc furnaces
EP0202352A1 (de) * 1985-05-22 1986-11-26 C. CONRADTY NÜRNBERG GmbH & Co. KG Plasmabrenner
DE3851436D1 (de) * 1988-12-07 1994-10-13 Sorg Gmbh & Co Kg Elektrode für einen Glasschmelzofen.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024105247A1 (fr) 2022-11-18 2024-05-23 Saint-Gobain Isover Four verrier électrique
FR3142185A1 (fr) 2022-11-18 2024-05-24 Saint-Gobain Isover Four verrier électrique

Also Published As

Publication number Publication date
CN1054960C (zh) 2000-07-26
ES2202328T3 (es) 2004-04-01
DE69432892T2 (de) 2004-05-27
NO313170B1 (no) 2002-08-19
KR960702724A (ko) 1996-04-27
DE69432892D1 (de) 2003-08-07
NO952020L (no) 1995-05-22
JP3655308B2 (ja) 2005-06-02
NO952020D0 (no) 1995-05-22
EP0671116A1 (fr) 1995-09-13
WO1995009518A1 (fr) 1995-04-06
US5596598A (en) 1997-01-21
JPH08504055A (ja) 1996-04-30
FI952603A0 (fi) 1995-05-29
BR9405619A (pt) 1999-09-08
DK0671116T3 (da) 2003-10-27
CN1115199A (zh) 1996-01-17
FI952603A (fi) 1995-05-29
ZA947131B (en) 1995-05-08
KR100391193B1 (ko) 2003-12-01
CA2150236A1 (fr) 1995-04-06

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