EP0087523A1 - Einrichtung zur Erhitzung von Gasströmen mittels eines elektrischen Lichtbogens - Google Patents

Einrichtung zur Erhitzung von Gasströmen mittels eines elektrischen Lichtbogens Download PDF

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Publication number
EP0087523A1
EP0087523A1 EP82200213A EP82200213A EP0087523A1 EP 0087523 A1 EP0087523 A1 EP 0087523A1 EP 82200213 A EP82200213 A EP 82200213A EP 82200213 A EP82200213 A EP 82200213A EP 0087523 A1 EP0087523 A1 EP 0087523A1
Authority
EP
European Patent Office
Prior art keywords
air gap
annular air
electrodes
electrode
auxiliary 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.)
Ceased
Application number
EP82200213A
Other languages
English (en)
French (fr)
Inventor
Roald Bingen
Yves Becko
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.)
Umicore NV SA
Original Assignee
Ateliers de Constructions Electriques de Charleroi SA
ACEC SA
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 Ateliers de Constructions Electriques de Charleroi SA, ACEC SA filed Critical Ateliers de Constructions Electriques de Charleroi SA
Priority to EP82200213A priority Critical patent/EP0087523A1/de
Publication of EP0087523A1 publication Critical patent/EP0087523A1/de
Ceased 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
    • H05B7/18—Heating by arc discharge
    • H05B7/185—Heating gases for arc discharge
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3421—Transferred arc or pilot arc mode
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3431—Coaxial cylindrical electrodes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/40—Details, e.g. electrodes, nozzles using applied magnetic fields, e.g. for focusing or rotating the arc

Definitions

  • the present invention relates to a heating device for gaseous fluids by means of an electric arc maintained by means of a power source between two main, coaxial, hollow electrodes delimited by surfaces of revolution, forming a treatment chamber approximately. cylindrical.
  • Such heating devices are known per se, for example from German patent No. 1 245 509.
  • the main electrodes are separated there from one another by an annular gap and each surrounded by a coil supplied by a direct current generating a longitudinal magnetic field relative to the axis common to the main electrodes.
  • the known device further comprises means for conveying a gaseous fluid through said treatment chamber and means for injecting a gaseous fluid through said gap in the treatment chamber.
  • the installed power is generally a multiple of the power actually used, because each time the arc is extinguished, a new arc must be struck, which requires a starting voltage high.
  • the power source supplying the arc thus has a power equal to the ignition voltage times the maximum arc current, while the power used is only equal to the arc voltage in regime times the maximum arc current. .
  • Such a current source is expensive; it requires large impedances to limit the current and insulation for very high voltages.
  • the object of the invention is to reduce the installed power of such a device to a minimum.
  • a new device of this kind is characterized in that in at least one determined location on the outside of the two main electrodes at least one auxiliary electrode is disposed near the narrowest constriction of the annular air gap, at a short distance from another electrode, in that a source of low power, of high voltage initiates at least temporarily a discharge between said auxiliary electrode and and other electrode and in that the fluid injected through the annular gap blows into the said annular gap the plasma generated by this discharge.
  • a hollow cylindrical main electrode 1 is placed end-to-end and coaxially with respect to another hollow cylindrical main electrode 2.
  • the two electrodes 1 and 2 are spaced from one another and form an air gap annular defined by an insulating part 3 against which the two electrodes 1 and 2 are pressed.
  • Each of the electrodes 1 and 2 has a bundle of channels 4 cut for example from the metal of the electrodes. These channels remain open and allow a gaseous fluid to be brought into a distribution space 5 surrounding the annular air gap.
  • the gaseous fluid brought into the distribution space 5 is injected through the air gap into the treatment space 6 disposed inside the electrodes through which a gaseous fluid to be treated passes.
  • the electrodes 1 and 2 are surrounded by coils 7 and 8 traversed by a direct current, generating a magnetic field along the surfaces of the electrodes 1 and 2.
  • An auxiliary electrode 9 crosses the insulating part 3 and approaches the electrode 2 in the distribution space 5 at a location very close to the narrowest throttle of the air gap between the electrodes 1 and 2.
  • the auxiliary electrode 9 is connected to an alternating voltage source, not shown, of frequency for example thirty or a thousand times higher than the frequency of the arc current passing through the electrodes 1 and 2.
  • the alternating voltage source can be connected on the other hand either to another auxiliary electrode ) not shown, or directly to one of the main electrodes for example the electrode 2.
  • a low power discharge is maintained between the electrodes 2 and 9 which generates a certain quantity of electrons and ions which are blown through the air gap and allow to strike the arc at extremely low voltages, only slightly higher than the arc voltage.
  • the voltage of the auxiliary voltage source must be chosen equal to 28 kV, the maximum intensity of this source can be limited to 500 mA. Or the power of 14 kVA at a frequency of, for example, 50,000 Hz.
  • the current source connected to the main electrodes can operate at 50 Hz with a voltage of only 3 kV and an intensity of 5 kA or a power of 15 MVA. This useful power therefore requires only about 10% supplement to ensure the re-striking of the arc.
  • the invention is applicable both to striking arcs in direct current or in alternating current.
  • the ignition of the arc using the auxiliary electrode can be done when the arc is extinguished, for example by means of a short pulse train.
  • intermittent ignition can only be envisaged in the case where the operating conditions are very stable and where the arcing strikes are erratic and rare.
  • This voltage can be continuous or alternating preferably at a frequency of at least 20 times the frequency of the voltage applied between the main electrodes.
  • the intensity of the discharge current maintained by the auxiliary electrode depends on the gas pressure, its nature, the distance of the auxiliary electrode, the main electrode and the narrowest air gap between the electrodes. main. It is chosen to be large enough to guarantee re-strikes of the main arc at each alternation of the main current or at each interruption of the main current.
  • An intensity of 500 mA is sufficient in a hydrogen atmosphere at atmospheric pressure and when the auxiliary electrode is at a distance of 10 mm from the narrowest air gap between the main electrodes and 5 mm from the mass of the electrode nearest main.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP82200213A 1982-02-22 1982-02-22 Einrichtung zur Erhitzung von Gasströmen mittels eines elektrischen Lichtbogens Ceased EP0087523A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP82200213A EP0087523A1 (de) 1982-02-22 1982-02-22 Einrichtung zur Erhitzung von Gasströmen mittels eines elektrischen Lichtbogens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82200213A EP0087523A1 (de) 1982-02-22 1982-02-22 Einrichtung zur Erhitzung von Gasströmen mittels eines elektrischen Lichtbogens

Publications (1)

Publication Number Publication Date
EP0087523A1 true EP0087523A1 (de) 1983-09-07

Family

ID=8189467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82200213A Ceased EP0087523A1 (de) 1982-02-22 1982-02-22 Einrichtung zur Erhitzung von Gasströmen mittels eines elektrischen Lichtbogens

Country Status (1)

Country Link
EP (1) EP0087523A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989011775A1 (en) * 1988-05-17 1989-11-30 Commonwealth Scientific And Industrial Research Or Electric arc reactor
AU618372B2 (en) * 1989-05-17 1991-12-19 Srl Plasma Pty Ltd Electric arc reactor
CN108322988A (zh) * 2018-04-12 2018-07-24 西安交通大学 一种适用于柔性直流输电直流断路器的换流开关装置
WO2022262097A1 (zh) * 2021-06-18 2022-12-22 江苏天楹等离子体科技有限公司 一种中间段结构等离子体发生器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1311252A (fr) * 1961-10-06 1962-12-07 Soudure Electr Autogene Installation pour l'obtention d'un plasma à haute température
DE1232289B (de) * 1964-06-11 1967-01-12 Westinghouse Electric Corp Plasmabrenner fuer Drehstrombetrieb
DE1245509B (de) * 1964-03-06 1967-07-27 Westinghouse Electric Corp Plasmastrahlgenerator
US3452239A (en) * 1966-12-05 1969-06-24 Westinghouse Electric Corp Multi-electrode arc heaters
DE2255483A1 (de) * 1971-12-09 1973-06-14 British Titan Ltd Heizvorrichtung
US4038512A (en) * 1975-08-11 1977-07-26 Westinghouse Electric Corporation Self-stabilizing arc heater

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1311252A (fr) * 1961-10-06 1962-12-07 Soudure Electr Autogene Installation pour l'obtention d'un plasma à haute température
DE1245509B (de) * 1964-03-06 1967-07-27 Westinghouse Electric Corp Plasmastrahlgenerator
DE1232289B (de) * 1964-06-11 1967-01-12 Westinghouse Electric Corp Plasmabrenner fuer Drehstrombetrieb
US3452239A (en) * 1966-12-05 1969-06-24 Westinghouse Electric Corp Multi-electrode arc heaters
DE2255483A1 (de) * 1971-12-09 1973-06-14 British Titan Ltd Heizvorrichtung
US4038512A (en) * 1975-08-11 1977-07-26 Westinghouse Electric Corporation Self-stabilizing arc heater

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989011775A1 (en) * 1988-05-17 1989-11-30 Commonwealth Scientific And Industrial Research Or Electric arc reactor
AU618372B2 (en) * 1989-05-17 1991-12-19 Srl Plasma Pty Ltd Electric arc reactor
CN108322988A (zh) * 2018-04-12 2018-07-24 西安交通大学 一种适用于柔性直流输电直流断路器的换流开关装置
WO2022262097A1 (zh) * 2021-06-18 2022-12-22 江苏天楹等离子体科技有限公司 一种中间段结构等离子体发生器

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19830623

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ATELIERS DE CONSTRUCTIONS ELECTRIQUES DE CHARLEROI

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ATELIERS DE CONSTRUCTIONS ELECTRIQUES DE CHARLEROI

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19860303

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BINGEN, ROALD

Inventor name: BECKO, YVES