EP0410829A1 - Verfahren zum Heizen eines Metallbades - Google Patents

Verfahren zum Heizen eines Metallbades Download PDF

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Publication number
EP0410829A1
EP0410829A1 EP90401858A EP90401858A EP0410829A1 EP 0410829 A1 EP0410829 A1 EP 0410829A1 EP 90401858 A EP90401858 A EP 90401858A EP 90401858 A EP90401858 A EP 90401858A EP 0410829 A1 EP0410829 A1 EP 0410829A1
Authority
EP
European Patent Office
Prior art keywords
heating
metallic
bath
metal
bath according
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.)
Withdrawn
Application number
EP90401858A
Other languages
English (en)
French (fr)
Inventor
Eric Duchateau
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP0410829A1 publication Critical patent/EP0410829A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B14/14—Arrangements of heating devices
    • 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
    • H05B3/62—Heating elements specially adapted for furnaces
    • H05B3/64—Heating elements specially adapted for furnaces using ribbon, rod, or wire heater
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/04—Crucible or pot furnaces adapted for treating the charge in vacuum or special atmosphere
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B2014/0875—Two zones or chambers, e.g. one used for charging
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B2014/0893—Heat-conductive material disposed on the surface of the melt
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D99/0035—Heating indirectly through a radiant surface

Definitions

  • the invention relates to a method of heating a metallic mass, in particular maintaining the fusion of a metallic bath, of the type in which radiant energy is developed in a space overhanging said metallic mass in the direction of the surface of the metallic mass. or metallic bath.
  • This kind of technique is mainly used in fusion in the so-called basin furnaces for the fusion and / or the maintenance of aluminum alloys, where the heat necessary for the fusion or the maintenance in fusion of the metal is provided by heating elements. placed in a vault and radiating directly on the load.
  • the vault temperatures are important (often above 1000 ° C) in order to be able to transfer the energy between the vault and the bath (bath temperature of the order of 700 ° C with aluminum alloys).
  • bath temperature of the order of 700 ° C with aluminum alloys.
  • the installed power must be much higher than the average energy consumed.
  • typically 80 kw of installed power is obtained for 30 kwh / h of average consumption.
  • this type of heat transfer promotes the formation of oxide concretions which destroy the refractories of the bath.
  • the process according to the invention makes it possible to avoid the abovementioned drawbacks, by propagating the radiant energy in an atmosphere of neutral gas, then through a floating sheet formed of transition elements made up of a plurality of plates in material good thermal conductor, good absorber of radiation, and density ensuring their buoyancy in the metal during heating. Thanks to the good absorption coefficient of the plates (of the order of 0.9), the thermal transfer between the plates and the radiating vault is improved, the heat then being transferred by conduction from the plates to the bath. The use of plates limits the aluminum deposits on the absorbent surface (the absorption coefficient of the surface therefore remains very good in use.
  • the inert atmosphere can be injected through the bath by a porous plug at the bottom of the basin or directly through the enclosure vault.
  • the inert gas flow is adjusted so as to maintain a slight overpressure in the enclosure. This eliminates air inlets and limits carbon oxidation and any risk of formation. carbon monoxide.
  • the slightly reducing or neutral atmosphere in the oven does not favor the development of concretions, which improves the service life of refractories.
  • the plate-shaped transition elements are made of graphite or carbon and the neutral gas is nitrogen and / or argon.
  • Such a holding oven comprises a basin 1 formed from a bottom 2 and side walls 3 and 4; it contains a liquid metal 5, for example an aluminum alloy.
  • An intake zone 6 of liquid metal or ingots is covered by a pivoting door 13 and, on the other hand, a zone 7 is used to withdraw liquid metal towards a molding machine.
  • the heating enclosure 8 with a vault 9 and side walls 10 plunging below the level of liquid bath.
  • the vault 9 is equipped with radiant heating means 12.
  • a neutral gas injector (not shown) in the enclosure 8 is formed either through a wall 10 of the enclosure, or in the form of a porous plug through the bottom 2 of the basin, directly above the enclosure 8, all so that the interior 11 of the enclosure 8 remains under low overpressure.
  • a hatch not shown, formed through the enclosure wall 10, a plurality of graphite or carbon 3 elements have been engaged on the surface of the molten metal bath in the form of thin plates (of the 'order of a few centimeters) so as to form a floating sheet covering most of the surface of the metal bath 5.
  • the invention applies primarily to the foundry of aluminum or aluminum alloys.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
EP90401858A 1989-07-28 1990-06-28 Verfahren zum Heizen eines Metallbades Withdrawn EP0410829A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8910222 1989-07-28
FR8910222A FR2650380A1 (fr) 1989-07-28 1989-07-28 Procede de chauffage d'un bain metallique

Publications (1)

Publication Number Publication Date
EP0410829A1 true EP0410829A1 (de) 1991-01-30

Family

ID=9384263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90401858A Withdrawn EP0410829A1 (de) 1989-07-28 1990-06-28 Verfahren zum Heizen eines Metallbades

Country Status (3)

Country Link
EP (1) EP0410829A1 (de)
CA (1) CA2021303A1 (de)
FR (1) FR2650380A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5250026A (en) * 1992-05-27 1993-10-05 Destron/Idi, Inc. Adjustable precision transponder injector
CN105627745B (zh) * 2016-03-18 2018-09-07 深圳市龙瑞泰兴能源环境科技有限公司 一种金属冶炼炉

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027862A (en) * 1975-12-19 1977-06-07 Frank W. Schaefer Inc. Metal melting furnace with alternate heating systems
GB1561786A (en) * 1976-12-09 1980-03-05 Ass Eng Ltd Heating vessles for molten metal
US4353738A (en) * 1981-05-18 1982-10-12 Lectromelt Corporation Lead smelting method
DE3512868A1 (de) * 1985-04-04 1986-10-09 W. Strikfeldt & Koch Gmbh, 5276 Wiehl Ofen, insbesondere schmelz- oder warmhalteofen fuer metall
DE3739073A1 (de) * 1986-12-30 1988-07-14 Poppi Spa Brennofen fuer keramikmaterialien wie fliesen und aehnliches

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027862A (en) * 1975-12-19 1977-06-07 Frank W. Schaefer Inc. Metal melting furnace with alternate heating systems
GB1561786A (en) * 1976-12-09 1980-03-05 Ass Eng Ltd Heating vessles for molten metal
US4353738A (en) * 1981-05-18 1982-10-12 Lectromelt Corporation Lead smelting method
DE3512868A1 (de) * 1985-04-04 1986-10-09 W. Strikfeldt & Koch Gmbh, 5276 Wiehl Ofen, insbesondere schmelz- oder warmhalteofen fuer metall
DE3739073A1 (de) * 1986-12-30 1988-07-14 Poppi Spa Brennofen fuer keramikmaterialien wie fliesen und aehnliches

Also Published As

Publication number Publication date
FR2650380A1 (fr) 1991-02-01
CA2021303A1 (fr) 1991-01-29

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