EP2683999A1 - Procédé permettant de faire fonctionner un four à arc à courant alternatif, dispositif permettant la mise en uvre dudit procédé, ainsi que four à arc à courant alternatif muni dudit dispositif - Google Patents

Procédé permettant de faire fonctionner un four à arc à courant alternatif, dispositif permettant la mise en uvre dudit procédé, ainsi que four à arc à courant alternatif muni dudit dispositif

Info

Publication number
EP2683999A1
EP2683999A1 EP12713904.6A EP12713904A EP2683999A1 EP 2683999 A1 EP2683999 A1 EP 2683999A1 EP 12713904 A EP12713904 A EP 12713904A EP 2683999 A1 EP2683999 A1 EP 2683999A1
Authority
EP
European Patent Office
Prior art keywords
slag
electrode
furnace
electric arc
arc furnace
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Withdrawn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
EP12713904.6A
Other languages
German (de)
English (en)
Inventor
Thomas Matschullat
Detlef Rieger
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.)
Primetals Technologies Germany GmbH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP12713904.6A priority Critical patent/EP2683999A1/fr
Publication of EP2683999A1 publication Critical patent/EP2683999A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/28—Arrangement of controlling, monitoring, alarm or the like devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • 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
    • F27D11/10—Disposition of electrodes
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/0028—Devices for monitoring the level of the melt
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • 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
    • F27D19/00—Arrangements of controlling devices
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/04—Arrangements of indicators or alarms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
    • G06N5/00—Computing arrangements using knowledge-based models
    • G06N5/04—Inference or reasoning models
    • G06N5/048—Fuzzy inferencing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a method for operating an alternating current electric arc furnace, comprising at least one electrode for producing a melt in a furnace vessel, where vibrations are measured ⁇ on a wall of the furnace vessel, through which a slag height of the melt is determined.
  • the invention further relates to a device for carrying out this method and an AC electric arc furnace with such a device.
  • WO 2010/088972 for controlling a carbon monoxide emission of an electric arc furnace determine the height of the foamed slag, wherein the coal ⁇ entry and / or the oxygen supply are controlled so that the height of the foamed slag is kept below a maximum value ⁇ .
  • the object of the invention is to enable a rapid reaction to the change in slag height in the AC electric arc furnace.
  • the object is achieved by a method for operating an AC electric arc furnace, comprising at least one electrode for producing a melt in a furnace vessel, wherein vibrations are measured on a wall of the Ofenge ⁇ vessel, through which a slag height of the melt is determined and wherein given by a set value control and / or control signals in case of deviations of a he ⁇ mediated actual value of the slag height, through which an arc length which is adapted at least one electrode.
  • At least one structure-borne sound sensor for detecting vibrations on a wall of a furnace vessel of an AC electric arc furnace, wherein the AC electric arc furnace has at least one electrode for producing a melt in the furnace vessel,
  • the target value is not an absolute value, but an allowable range, which is characterized by a permissible maximum value and a permissible minimum value. Upon exceeding or falling below the target range of the allowable maximum value over ⁇ reached or the permissible minimum value is thus maintained.
  • the coal feed is increased or reduced for a specific time, as can be deduced from WO 2010/088972. Due to the delay in delivery elapses until the reaction to this measure egg ⁇ niger time, in the order of about 20 seconds lies. In comparison, the electrode control takes place to adapt the arc length with a significantly shorter reaction time of about one second. Thanks to the control of the Lichtbo ⁇ gene length lower radiation losses are present, which have a minimized radiation to the furnace walls result.
  • Exceeding the target value is treated equally in all development periods of the slag in particular. If the actual value exceeds the nominal value, preference ⁇ , the arc length of höht at least one ER electrode.
  • the alternating current electric arc furnace expediently has three electrodes and one structure-borne sound sensor is provided for each electrode.
  • Each electrode is assigned to a zone of the furnace vessel and the height of the slag is determined for each zone.
  • the control or regulation of each of the three electrodes takes place in particular independently of the other two electrodes.
  • the foam slag height is measured separately in all three zones of the furnace vessel and the arc length of each of the three electrodes is adjusted individually to the spatial slag height distribution in the furnace vessel on the basis of the measurement data of the corresponding zone.
  • structure-borne noise sensors 4a, 4b, 4c for measuring vibrations are arranged on a wall 2a of the furnace vessel 2, ie at the outer boundary of the furnace vessel 2, structure-borne noise sensors 4a, 4b, 4c for measuring vibrations are arranged.
  • the structure-borne sound ⁇ sensors 4a, 4b, 4c may be connected to the furnace vessel 2 indirectly and / or directly.
  • the acoustic emission sensors 4a, 4b, 4c are in particular to the electrodes 3a, 3b, 3c arranged gegenü ⁇ bercharacter sides of the wall 2a.
  • the structure-borne sound sensors 4a, 4b, 4c are in this case preferably designed as Accelerati ⁇ supply sensors and positioned above the foaming slag in the furnace vessel.
  • sensor and control devices 13a, 13b, 13c are provided on the power supply lines of the electrodes 3a, 3b, 3c, with the aid of which current and / or voltage or the energy supplied to the electrodes 3a, 3b, 3c is measured and can be regulated.
  • the sensor and control devices 13a, 13b, 13c are formed with a control unit 8, for example via a cable
  • Signal lines 14a, 14b, 14c coupled. More Signallei ⁇ obligations 14d, 14e, 14f serve to connect the sensor and control devices 13a, 13b, 13c with a control or regulating device 9, which receives the control requirements of the computing unit. 8
  • the control and / or regulating device 9 is further referred to simply as a control device 9.
  • the integrated crizein ⁇ 8 may be an integral part of the control and / or regulating device. 9
  • the structure-borne noise sensors 4a, 4b, 4c, the sensor and control devices 13a, 13b, 13c, the arithmetic unit 8 and the control device 9 are part of a device 10, which is indicated in FIG 1 by dashed lines.
  • the control device 9 regulates the specification of the computing unit 8 both the supply of carbon and oxygen and the arc lengths of the electrodes 3a, 3b, 3c on the impedance of the electrodes 3a, 3b, 3c. Decisive for this scheme is a temporal differentiation between the different development periods of the foamed slag, so that the arc is regulated differently depending on the different stages of slag formation.
  • the control device 9 preferably comprises a fuzzy controller 11.
  • Slag height averaged over time remains essentially con ⁇ stant. From about 3150 seconds after the start of the melting process in the AC electric arc furnace 1 begins a final period of slag formation, in which the fluctuations of the slag height H re i. are particularly strong and the average te relative slag height is slightly lower than in the slag period.
  • the initial period I can be a strong foaming occurring defects ⁇ th, but the foaming may in some areas that are not heated enough, be greatly delayed.
  • four cases can be distinguished:
  • the control of the arc length depends on whether the larger scrap chunks in the vicinity of the electrodes or the wall of the AC electric arc furnace befin ⁇ the. When you are below the electrode, the arc is shortened; if you are closer to the wall, the arc lengthens.
  • the target value setting S un ⁇ is undershot, then the arc lengths of the respective electrode 3a, 3b, 3c, which is ordered to-this zone is reduced.
  • the radiation power is correspondingly corrected ⁇ down to conserve the wall 2a in operation.
  • the fuzzy-based control system outputs the correction factors for the individual arc lengths, which are processed and adjusted in an electrode control.
  • the wesentli ⁇ che advantage of controlling the arc length is the short reaction time of about one second. Thus it can be alternates to the ruling in the furnace vessel 2 conditions rea ⁇ particularly fast.
  • the adaptation of the arc length is in particular ⁇ special in combination with a regulation of Kohlenstoff,. Operated oxygen supply and serves to optimize the power input and thus to lower radiation losses to the wall of the AC electric arc furnace.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

L'invention concerne un procédé permettant de faire fonctionner un four à arc à courant alternatif, un dispositif permettant la mise en œuvre dudit procédé, ainsi qu'un four à arc à courant alternatif (1) muni dudit dispositif. Pendant le fonctionnement d'un four à arc à courant alternatif (1) comprenant au moins au moins une électrode (3a, 3b, 3c) pour la production d'une masse fondue, on mesure les oscillations sur une paroi (2a) d'une cuve de four (2), ce qui permet de déterminer une hauteur de laitier (Hrel) de la masse fondue. Il est possible de réagir rapidement à une modification de la hauteur de laitier en adaptant la longueur de l'arc de ladite électrode (3a, 3b, 3c) en cas d'écarts entre une valeur effective déterminée (A, B, C) et une valeur théorique (S) de la hauteur de laitier.
EP12713904.6A 2011-04-13 2012-03-20 Procédé permettant de faire fonctionner un four à arc à courant alternatif, dispositif permettant la mise en uvre dudit procédé, ainsi que four à arc à courant alternatif muni dudit dispositif Withdrawn EP2683999A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12713904.6A EP2683999A1 (fr) 2011-04-13 2012-03-20 Procédé permettant de faire fonctionner un four à arc à courant alternatif, dispositif permettant la mise en uvre dudit procédé, ainsi que four à arc à courant alternatif muni dudit dispositif

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11162238A EP2511638A1 (fr) 2011-04-13 2011-04-13 Procédé de fonctionnement d'un four électrique à arc lumineux, dispositif d'exécution du procédé et four électrique à arc lumineux doté d'un tel dispositif
EP12713904.6A EP2683999A1 (fr) 2011-04-13 2012-03-20 Procédé permettant de faire fonctionner un four à arc à courant alternatif, dispositif permettant la mise en uvre dudit procédé, ainsi que four à arc à courant alternatif muni dudit dispositif
PCT/EP2012/054863 WO2012139859A1 (fr) 2011-04-13 2012-03-20 Procédé permettant de faire fonctionner un four à arc à courant alternatif, dispositif permettant la mise en œuvre dudit procédé, ainsi que four à arc à courant alternatif muni dudit dispositif

Publications (1)

Publication Number Publication Date
EP2683999A1 true EP2683999A1 (fr) 2014-01-15

Family

ID=44318206

Family Applications (2)

Application Number Title Priority Date Filing Date
EP11162238A Withdrawn EP2511638A1 (fr) 2011-04-13 2011-04-13 Procédé de fonctionnement d'un four électrique à arc lumineux, dispositif d'exécution du procédé et four électrique à arc lumineux doté d'un tel dispositif
EP12713904.6A Withdrawn EP2683999A1 (fr) 2011-04-13 2012-03-20 Procédé permettant de faire fonctionner un four à arc à courant alternatif, dispositif permettant la mise en uvre dudit procédé, ainsi que four à arc à courant alternatif muni dudit dispositif

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP11162238A Withdrawn EP2511638A1 (fr) 2011-04-13 2011-04-13 Procédé de fonctionnement d'un four électrique à arc lumineux, dispositif d'exécution du procédé et four électrique à arc lumineux doté d'un tel dispositif

Country Status (5)

Country Link
US (1) US20140112365A1 (fr)
EP (2) EP2511638A1 (fr)
MX (1) MX338597B (fr)
RU (1) RU2605739C2 (fr)
WO (1) WO2012139859A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013222158A1 (de) * 2013-10-31 2015-05-13 Siemens Aktiengesellschaft Verfahren zum Betreiben eines Lichtbogenofens sowie Lichtbogenofen
DE102014204239A1 (de) * 2014-03-07 2015-09-10 Siemens Aktiengesellschaft Verfahren zur Bestimmung der Variation einer Schlackenhöhe
CN103900375B (zh) * 2014-04-18 2016-01-20 大连理工大学 电弧炉冶炼电熔镁预防喷炉系统及方法
CN104596315B (zh) * 2015-01-27 2016-10-26 中国恩菲工程技术有限公司 适于泡沫渣炉况的电炉功率控制装置
IT201900025441A1 (it) * 2019-12-23 2021-06-23 Danieli Off Mecc Metodo di fusione in un forno elettrico ad arco e apparato di fusione

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2014762C1 (ru) * 1991-07-05 1994-06-15 Акционерное общество открытого типа "Санкт-Петербургское акционерное общество научно-исследовательского и проектного института основной химической промышленности" Система автоматического управления электрическим режимом рудно-термической печи
DE4344854A1 (de) * 1993-12-29 1995-07-06 Abb Management Ag Verfahren zur Elektrodenregelung eines Gleichstrom-Lichtbogenofens und Elektrodenregeleinrichtung
DE19711453C2 (de) * 1997-03-19 1999-02-25 Siemens Ag Verfahren zur Regelung bzw. Steuerung eines Schmelzprozesses in einem Drehstrom-Lichtbogenofen
RU2268556C1 (ru) * 2004-04-01 2006-01-20 Государственное Учреждение Институт металлургии Уральского отделения Российской Академии Наук (ГУ ИМЕТ УрО РАН) Способ управления технологией электродуговой восстановительной плавки
JP2009503419A (ja) 2005-07-22 2009-01-29 シーメンス アクチエンゲゼルシヤフト アーク炉の状態量を算定するための方法とアーク炉
DE102008006966A1 (de) 2008-01-31 2009-08-06 Siemens Aktiengesellschaft Verfahren zur Ermittlung eines Stückigkeitsmaßes für Feststoff in einem Lichtbogenofen, einen Lichtbogenofen, eine Signalverarbeitungseinrichtung sowie Programmcode und ein Speichermedium
WO2010088972A1 (fr) 2009-02-03 2010-08-12 Siemens Aktiengesellschaft Procédé et dispositif pour réguler un rejet de monoxyde de carbone d'un four à arc électrique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2012139859A1 *

Also Published As

Publication number Publication date
EP2511638A1 (fr) 2012-10-17
WO2012139859A1 (fr) 2012-10-18
MX2013011878A (es) 2013-11-01
US20140112365A1 (en) 2014-04-24
RU2013150350A (ru) 2015-05-20
RU2605739C2 (ru) 2016-12-27
MX338597B (es) 2016-04-22

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