EP0269735A1 - Four a plasma a fonctionnement par induction - Google Patents

Four a plasma a fonctionnement par induction Download PDF

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Publication number
EP0269735A1
EP0269735A1 EP86904984A EP86904984A EP0269735A1 EP 0269735 A1 EP0269735 A1 EP 0269735A1 EP 86904984 A EP86904984 A EP 86904984A EP 86904984 A EP86904984 A EP 86904984A EP 0269735 A1 EP0269735 A1 EP 0269735A1
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EP
European Patent Office
Prior art keywords
crucible
plasmatron
ring
power source
bottom electrode
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Withdrawn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
EP86904984A
Other languages
German (de)
English (en)
Other versions
EP0269735A4 (fr
Inventor
Mikhail Yakovlevich Kaplun
Mikhail Mironovich Krutyansky
Vadim Georgievich Ladozhsky
Vladimir Sergeevich Malinovsky
Leonid Borisovich Odnopozov
Alexandr Alexandrovich Prostyakov
Alexandr Lvovich Rezunenko
Alexandr Viktorovich Svido
Evgeny Petrovich Terekhov
Nikolai Ivanovich Fomin
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.)
VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY PROEKTNO-KONSTRUKTORSKY I TEKHNOLOGICHESKY INST ELEKTROTERMICHESKOGO OBORUDOVANIA VNIIETO
Original Assignee
VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY PROEKTNO-KONSTRUKTORSKY I TEKHNOLOGICHESKY INST ELEKTROTERMICHESKOGO OBORUDOVANIA VNIIETO
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 VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY PROEKTNO-KONSTRUKTORSKY I TEKHNOLOGICHESKY INST ELEKTROTERMICHESKOGO OBORUDOVANIA VNIIETO filed Critical VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY PROEKTNO-KONSTRUKTORSKY I TEKHNOLOGICHESKY INST ELEKTROTERMICHESKOGO OBORUDOVANIA VNIIETO
Publication of EP0269735A1 publication Critical patent/EP0269735A1/fr
Publication of EP0269735A4 publication Critical patent/EP0269735A4/fr
Withdrawn legal-status Critical Current

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    • 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
    • H05B11/00—Heating by combined application of processes covered by two or more of groups H05B3/00 - H05B7/00
    • 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

Definitions

  • Induction crucible oils for melting metals and alloys are known. They contain a refractory crucible surrounded by an inductor. The heat necessary for the formation of a melt in these furnaces is generated by the currents induced in the metal batch (S. A. Farbmann, I.F. Kolobnjev, "Induction Furnaces for Melting Metals and Alloys", Verlag “Metallurgia”, Moscow, 1968, p. 328).
  • furnaces are characterized by a low brine speed of the light batch and a low activity of the slag, which has a relatively low temperature.
  • the reason for the low temperature of the slag in these furnaces lies in the functional principle of these furnaces, in which the power in the electrically conductive feed is induced by the electromagnetic field of the inductor. Since slugs are an electrically non-conductive substance, no power is generated in them and they heat up through heat conduction from the molten metal.
  • plasma induction furnaces which contain a refractory crucible with an inductor comprising the crucible, a plasmatron connected to a power source and mounted above the crucible, and a base electrode which is installed in the base of the crucible and is connected to the power source of the plasmatron via a switching device ( JP-PS No. 13242/65, Nat. Kl. 10A41).
  • a plasma arc is struck between the cathode of the plasmatron and the charge, which is in electrical contact with the bottom electrode.
  • the power generated by the arc does not depend on the density of the feed, which can significantly intensify the melting process of the light batch.
  • the slag is heated in this furnace primarily by the radiation emanating from the arc, which means that the slag can reach considerable temperatures that are higher than the temperature of the metal.
  • the slag heated by the plasma arc has a significantly higher refining activity, which improves the quality of the metal.
  • the heated slag vigorously interacts with the refractory lining of the crucible and shortens its life.
  • the radiation from the plasma arc causes the upper part of the crucible to overheat, which further shortens the life of the crucible's lining.
  • the bottom electrode is subjected to high thermal loads after the batch has been melted and the metal melt has been overheated.
  • the increase in the heat load is caused by the fact that in addition to the Joule heat which is generated in the bottom electrode by the currents flowing in it, the heat which is transferred to the bottom electrode by the overheated melt which passes through in the zone of the end face of the bottom electrode Forces of the electromagnetic interaction of the current with the own magnetic field circulate. This phenomenon increases the melting of the bottom electrode and causes it to fail prematurely.
  • the invention has for its object to perfect the construction of a plasma induction furnace so that there is no destruction of the functional elements of the furnace (the lining of the crucible, the bottom electrode) at high power of the plasmatron, thereby increasing the life and reliability of the furnace and its technological possibilities are expanded.
  • This object is achieved in that in a plasma induction furnace which contains a refractory crucible with an inductor comprising the crucible, a plasmatron connected to a power source, mounted above the crucible, and a bottom electrode which is arranged in the bottom of the crucible and to the power source of the plasmatron is connected via a switching device, according to the invention, the upper part of the crucible is formed in the form of a cooled metal ring.
  • a plasma induction furnace manufactured according to the present invention is of high reliability and long service life as a result of the protection of the crucible from the radiation from the arc and the action of the active hot slags with the aid of the cooled metal ring and also as a result of the current supply through the metal ring and the currentless mowing the bottom electrode after the batch has melted.
  • the appropriate plasma induction furnace has a high performance due to the increase in the power generated by the plasmatron, wide technological possibilities of the unit and a high quality of the metal due to the use of any reactive slags and high temperatures of the plasma arc.
  • the plasma induction furnace contains a refractory crucible 1 with an inductor 2 comprising the crucible 1, a plasmatron 3, which is arranged above the crucible 1 and connected to a power source 4, and a bottom electrode 5, which is installed in the bottom of the crucible 1 and via the Contact "a" of a Umscnaltvorricntung 6 is connected to the power source 4 of the plasmatron 3.
  • the upper part of the crucible 1 is formed in the slag zone in the form of a cooled metal ring 8.
  • the ring 8 is electrically coupled via the contact “b” of the switching device 6 to the current source 4 of the plasmatron.
  • a two-way switch with contacts "a” and "b” is used as the switching device 6.
  • water, evaporation, air cooling or cooling by a liquid metal is used.
  • the material from which the ring is made - copper, steel or another metal - has a high thermal conductivity and low activity towards the batch.
  • a current source 9 is provided for applying a voltage to the inductor 2, but the current sources 4 and 9 can also be combined to form a current source.
  • To achieve a hermetic seal of the work space and reduce the heat losses of the crucible 1 has a DEK- k el 10. Also located in the wall of the crucible 1, a tap hole. 11
  • the plasma induction furnace according to the invention works as follows.
  • the current sources 4 and 9 are switched on, the current source 4 being connected to the bottom electrode 5 via the contact "a" of the switching device 6.
  • An arc 12 is ignited between the plasmatron 3 and the batch, which burns a shaft into the batch and transfers its heat output to the metal to be remelted.
  • the batch is filled and the process is repeated until the level of the melt 13 in the crucible 1 reaches the height of the ring 8.
  • the melting process of the batch proceeds with a high intensity due to the simultaneous action of the plasmatron 3 and the inductor 2.
  • the cooling of the ring 8 with the aid of a coolant and the high Thermal conductivity of the material from which the ring 8 is made maintains a low temperature on the surface of the ring 8 which comes into contact with the slag, as a result of which the slag is strongly cooled in the zone of the ring 8, which leads to the formation of a projection 14 which protects the ring 8 from the action of the melt 13, the slag and the radiation from the arc 12.
  • Any active slag can be introduced into the furnace according to the invention and heated to high temperatures with the help of the plasma arc 12, which considerably expands the technological possibilities of the furnace and improves the quality of the refined melt 13.
  • the melt 13 is tapped through the tap hole 11.
  • the plasma induction furnace can be used to melt ferrous and non-ferrous metals and alloys.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Furnace Details (AREA)

Abstract

Un four à plasma à fonctionnement par induction comporte un creuset en matière réfractaire (1) enserré dans un inducteur (2), un plasmatron (3) monté au-dessus du creuset (1) et relié à une source de puissance (4) et une électrode de foyer (5), montée dans le fond du creuset (1) et reliée à la source de puissance (4) du plasmatron (3) au moyen d'un dispositif de commutation (6). La partie supérieure du creuset (1) est formée d'un anneau métallique refroidi (8) relié électriquement au dispositif de commutation (6).
EP19860904984 1986-05-29 1986-05-29 Four a plasma a fonctionnement par induction. Withdrawn EP0269735A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1986/000049 WO1987007468A1 (fr) 1986-05-29 1986-05-29 Four a plasma a fonctionnement par induction

Publications (2)

Publication Number Publication Date
EP0269735A1 true EP0269735A1 (fr) 1988-06-08
EP0269735A4 EP0269735A4 (fr) 1988-09-28

Family

ID=21617000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860904984 Withdrawn EP0269735A4 (fr) 1986-05-29 1986-05-29 Four a plasma a fonctionnement par induction.

Country Status (3)

Country Link
EP (1) EP0269735A4 (fr)
JP (1) JPS63503490A (fr)
WO (1) WO1987007468A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103353235A (zh) * 2013-07-26 2013-10-16 朱兴发 一种电磁感应矿渣熔炉发热体电极的埋入熔渣式结构

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2197988A1 (fr) * 1972-08-29 1974-03-29 Nipkti Po Cherna Metalurgia
FR2362936A1 (fr) * 1976-08-23 1978-03-24 Tetronics Res & Dev Co Ltd Procede de reduction carbothermique d'alumine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU462320A1 (ru) * 1973-05-08 1975-02-28 Предприятие П/Я Г-4696 Индукционно-плазменна плавильна установка
JPS5522915B2 (fr) * 1974-04-25 1980-06-19
SE408958B (sv) * 1976-07-05 1979-07-16 Asea Ab Forfaringssett for smeltning av metaller eller metallegeringar
JPS63100687A (ja) * 1986-05-19 1988-05-02 Anritsu Corp カセツト

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2197988A1 (fr) * 1972-08-29 1974-03-29 Nipkti Po Cherna Metalurgia
FR2362936A1 (fr) * 1976-08-23 1978-03-24 Tetronics Res & Dev Co Ltd Procede de reduction carbothermique d'alumine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO8707468A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103353235A (zh) * 2013-07-26 2013-10-16 朱兴发 一种电磁感应矿渣熔炉发热体电极的埋入熔渣式结构

Also Published As

Publication number Publication date
WO1987007468A1 (fr) 1987-12-03
EP0269735A4 (fr) 1988-09-28
JPS63503490A (ja) 1988-12-15

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Inventor name: TEREKHOV, EVGENY PETROVICH

Inventor name: KAPLUN, MIKHAIL YAKOVLEVICH

Inventor name: KRUTYANSKY, MIKHAIL MIRONOVICH

Inventor name: FOMIN, NIKOLAI IVANOVICH

Inventor name: LADOZHSKY, VADIM GEORGIEVICH

Inventor name: SVIDO, ALEXANDR VIKTOROVICH

Inventor name: PROSTYAKOV, ALEXANDR ALEXANDROVICH

Inventor name: MALINOVSKY, VLADIMIR SERGEEVICH

Inventor name: ODNOPOZOV, LEONID BORISOVICH

Inventor name: REZUNENKO, ALEXANDR LVOVICH