EP0403035B1 - Procédé pour porter à une température un bain métallique - Google Patents

Procédé pour porter à une température un bain métallique Download PDF

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Publication number
EP0403035B1
EP0403035B1 EP90250080A EP90250080A EP0403035B1 EP 0403035 B1 EP0403035 B1 EP 0403035B1 EP 90250080 A EP90250080 A EP 90250080A EP 90250080 A EP90250080 A EP 90250080A EP 0403035 B1 EP0403035 B1 EP 0403035B1
Authority
EP
European Patent Office
Prior art keywords
temperature
molten mass
target temperature
heating
heating power
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
EP90250080A
Other languages
German (de)
English (en)
Other versions
EP0403035A3 (fr
EP0403035A2 (fr
Inventor
Hans Josef Dr. Rer. Nat. Bebber
Karsten Dipl.-Ing. Brabandt
Bernhard Dipl.-Ing. Espendiller
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0403035A2 publication Critical patent/EP0403035A2/fr
Publication of EP0403035A3 publication Critical patent/EP0403035A3/fr
Application granted granted Critical
Publication of EP0403035B1 publication Critical patent/EP0403035B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/04—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like tiltable
    • B22D41/05—Tea-pot spout ladles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
    • B22D2/006—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the temperature of the molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal

Definitions

  • the invention relates to a method for achieving a temperature of a molten metal at the outlet of a distribution channel, the heating energy required for this being generated by at least one plasma torch according to the preambles of claims 1 and 2.
  • EP-A1-0 180 741 discloses a method and a device for maintaining or increasing the temperature of a molten metal in a receptacle by supplying energy, the energy required for this being introduced by one or more plasma torches.
  • this document does not contain any information about how the heating power required for a predeterminable temperature should be measured.
  • the invention was based on the object of specifying a method which ensures that the temperature of a molten metal in a tundish at a predeterminable point, e.g. at the outlet of the vessel, even in the event of any interfering influences, corresponds to a predefinable temperature profile over time, the temperature profile in the simplest case also being constant (maintaining the temperature).
  • the heating power determined by the control which in principle can also have a profile depending on the time, can approximately achieve the desired profile of the target temperature in the event of non-occurring disturbances
  • the feedback of the measured temperature is used to a controller Adaptation of the heating power determined on the basis of the entered values to the heating power actually required to achieve the target temperature in the event of any interference.
  • the temperature profile of the molten metal is thus adjusted to a predefinable tolerance in relation to the target profile.
  • the melt does not remain in the distributor trough, but flows through, it is provided that the temperature of the melt upon entry into the distributor trough, the total mass of melt to be introduced into the distributor trough and its mass flow upon entry and exit of the distributor trough into the control system.
  • the control signal for the heating power must be taken into account, taking into account the system-related dead time, which results from the spatial separation of points along the path of the flowing mass with regard to its temperature profile results, be changed.
  • the distance between the plasma torch and the melt corresponding to the arc length is set to a low initial value and the current intensity is changed in accordance with the required heating power, the heating power required in each case is compared with a heating power characteristic value, which is possible at maximum current and the initial distance between the plasma torch and the melt and the power adjustment required for temperature control, as long as the required heating output is below the heating output characteristic value, only via the current (with the arc length equal to the initial distance) and, insofar as the required heating output is above the heating power value lies exclusively over the distance between the plasma torch and the melt (with the arc current equal to the maximum current).
  • the pouring or distribution channel 10 shown in FIG. 1 has an inlet 11 at one end and one or more outlets 19 to one or each of a continuous casting installation (not shown here) at the other end (such an installation is described, for example, in US Pat. PS 3,333,452).
  • One or more plasma torches 14 are passed through the cover 13 of the distributor trough 10, the distance a from the surface of the melt 12 corresponding to the arc length being changeable by a displacement device 15.
  • the plasma torch or torches 14 are connected to a current source 16.
  • a temperature measuring point T3 is provided at the at least one outlet of the distributor trough 10.
  • control and regulating device 17 which receives the measuring signal of the temperature of the measuring point T3 on the input side and is connected to the moving device 15 and the current source 16 with a separate output each.
  • the control and regulating device 17 for the distribution channel 10 consists of the adaptive control 31 and a control 32 (FIG. 2), which are linked to form a unit 33, and a power adjustment 34, the adaptive control 31 automatically adjusting its control program in accordance with by different Adapts initial conditions caused requirements (adapted).
  • the power adjustment 34 influences the current source 16 and the displacement device 15 within the controlled system 35 with the plasma torch 14 and the metal melt 12.
  • the heating power thus coupled directly influences the temperature T5 of the melt 12 below the at least one plasma torch 14.
  • this temperature T5 is a Dead time element t s is separated from the temperature T3 relevant for the process and thus for the control, which is fed back and compared with the target temperature curve T3 '(t) by a subtraction, the result of which is received in the controller 32.
  • the dead time t s is essentially due to the flow of the melt 12 in the channel 10 and the distance in the flow direction between the heat coupling through the at least one plasma torch 14 and the measuring point T3.
  • the controller 31 determines the control signals for the heating power Q ⁇ (t) required to achieve the temperature curve T3 ′ (t) to be achieved, without taking into account any interference that may occur.
  • the controller 31 also reacts automatically to changes in the process sequence (e.g. extension of a ladle change, delay in pouring, etc.), provided that these are entered by the staff using additional signals.
  • the controlled system 35 is in turn modeled in its various process states and, on the other hand, a reference temperature profile of the melt 12 in the distributor channel 10 is determined in the operating point state.
  • the control 32 in the event of a difference between the actual temperature T3 and the target temperature T3 '(t) which differs from zero or a predetermined torelance.
  • the control signal for heating power Q ⁇ (t) specified by the controller 31 changes taking into account the dead time t s such that the difference (T3 - T3 '(t)) develops back into the predefinable tolerance.
  • the power adjustment 34 queries whether the respective heating power Q ⁇ (t) is less than or equal to the heating power K (also referred to as the heating power characteristic value), the maximum current I max and a predetermined minimum distance a0 of the plasma torch 14 from the surface of the melt 12 can be reached.
  • the heating power Q ⁇ (t) specified by the controller 31 is less than or equal to the heating power K, the current intensity I is increased accordingly and, if the predetermined heating power Q ⁇ (t) is greater than the heating power K, the maximum current intensity I max leave and the distance a of the plasma torch 14 from the surface of the melt 12 is increased according to the predetermined heating power Q ⁇ (t) while increasing the arc voltage.
  • a double temperature feedback is provided in a further embodiment (FIG. 3).
  • a further temperature measuring point T5 which is set up in the distributor channel 10 below the plasma torch 14 (see dash-dotted connecting line in FIG. 3).
  • the measurement signal from the temperature measuring point 15 is fed into the controller 32 '.
  • the temperature of the melt 12 at the measuring point T3 now has essentially the same desired characteristic as the melt of the measuring point T5, since they are now separated from one another by the dead time element t s .
  • the difference between the target temperature T3' (t) and the temperature of the measuring point T3 is taken into account in a controller application control 37, taking into account the dead time t s which influences the control process of the controller 32 'in accordance with the temperature difference (T3' - T3) which is still present and thus adjusts T3 to the target curve T3 '(t).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (3)

  1. Procédé pour atteindre un profil, dans le temps, d'une température visée d'un bain métallique à la sortie d'une goulotte de distribution, l'énergie de chauffage nécessaire pour cela étant engendrée par au moins un brûleur à plasma commandé automatiquement,
    caractérisé en ce que :
    - le profil dans le temps d'une temperature visée (T3'(t)) du bain, la temperature (T4) du bain à l'entrée (11) dans la goulotte de distribution (10), la masse (m2), à amener en totalité dans la goulotte de distribution (10), du bain, son débit massique (m11, m19) à l'entrée (11) et à la sortie (19) dans ou hors de la goulotte de distribution (10), et les valeurs spécifiques, comme la densité, la fluidité, et la chaleur spécifique, du bain (12), ainsi que des paramètres de l'installation, comme les dimensions du récipient métallurgique, le type de la chemise du four, ou la structure de surface, sont entrés dans une commande adaptative (31),
    - à partir de ces valeurs, le profil d'un signal de réglage correspondant à la puissance de chauffage (Q(t)) nécessaire pour atteindre le profil de température souhaité est déterminé,
    - en même temps et de façon continue, la température effective (T3) du bain (12) est mesurée à la sortie (19) de la goulotte de distribution (10), et
    - le signal de réglage pour la puissance de chauffage (Q(t)), dans le cas d'un écart dépassant une tolérance prédéfinie de la température réelle du bain (12) de sa température visée (T3'(t)), est modifié au moyen d'un dispositif de réglage (32) en tenant compte du temps mort (ts) lié au système dans le sens qu'il est diminué dans le cas d'une température effective dépassant la temperature visée et qu'il est augmenté dans le cas d'une temperature effective restant inférieure à la température visée.
  2. Procédé pour atteindre un profil, dans le temps, d'une température visée d'un bain métallique à la sortie d'une goulotte de distribution, l'énergie de chauffage nécessaire pour cela étant engendrée par au moins un brûleur à plasma commandé automatiquement,
    caractérisé en ce que :
    - de façon continue, la température effective (T3) du bain (12) à la sortie (19) et la température (T5) du bain au-dessous de la zone d'influence du brûleur à plasma sont mesurées, et
    - le signal de réglage pour la puissance de chauffage (Q(t)), dans le cas d'un écart, dépassant une tolérance prédéfinie, de la température effective (T3) du bain (12) de sa température visée (T3'(t)), est modifié au moyen d'un dispositif de réglage (32') et d'un régulateur supplémentaire (37) dans le sens qu'il est diminué, dans le cas d'une température effective dépassant la température visée et qu'il est augmenté dans le cas d'une température effective n'atteignant pas la température visée.
  3. Procédé selon une des revendications 1 ou 2,
    caractérisé en ce que :
    - la distance (a), correspondant à la longueur d'arc, entre le brûleur à plasma (4, 14) et le bain (2, 12) est réglée à une valeur initiale (a₀) faible et, à ce moment, l'intensité (I) du courant est modifiée de façon correspondant à la puissance de chauffage (Q(t)) nécessaire,
    - la puissance de chauffage à chaque fois nécessaire (Q(t)) est comparée à une caractéristique (K) de la puissance de chauffage, qui est possible pour une intensité de courant maximale (Imax) et l'écartement initial (a₀) entre le brûleur à plasma (4, 14) et le bain (2, 12), et
    - l'adaptation (24, 34) de puissance nécessaire pour régler la température, aussi longtemps que la puissance de chauffage nécessaire (Q(t)) se trouve au-dessous de la caractéristique (K) de la puissance de chauffage, est effectuée exclusivement par l'intermédiaire de l'intensité de courant (I) et, aussi longtemps que la puissance de chauffage nécessaire (Q(t)) se trouve au-dessus de la caractéristique (K) de la puissance de chauffage, est effectuée exclusivement par l'intermédiaire de la distance (a) entre le brûleur à plasma (4, 14) et le bain (2, 12).
EP90250080A 1989-05-12 1990-03-22 Procédé pour porter à une température un bain métallique Expired - Lifetime EP0403035B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3915619A DE3915619A1 (de) 1989-05-12 1989-05-12 Verfahren zum erzielen einer temperatur einer metallschmelze
DE3915619 1989-05-12

Publications (3)

Publication Number Publication Date
EP0403035A2 EP0403035A2 (fr) 1990-12-19
EP0403035A3 EP0403035A3 (fr) 1991-03-27
EP0403035B1 true EP0403035B1 (fr) 1994-01-19

Family

ID=6380570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90250080A Expired - Lifetime EP0403035B1 (fr) 1989-05-12 1990-03-22 Procédé pour porter à une température un bain métallique

Country Status (6)

Country Link
US (1) US5081640A (fr)
EP (1) EP0403035B1 (fr)
JP (1) JP2925655B2 (fr)
KR (1) KR900017697A (fr)
DE (2) DE3915619A1 (fr)
ZA (1) ZA903344B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5793022A (en) * 1996-09-12 1998-08-11 Applied Materials, Inc. Adaptive temperture controller and method of operation
GB2352992B (en) * 1999-08-05 2002-01-09 Pyrotek Engineering Materials Distributor device
DE102014213744A1 (de) * 2014-07-15 2016-01-21 Primetals Technologies Germany Gmbh Elektrischer Lichtbogenofen mit einer Sicherheitsvorrichtung und Verfahren zur Sicherung von Peripheriegeräten an elektrischen Lichtbogenöfen
CN114178504B (zh) * 2021-12-13 2022-09-02 北京航星机器制造有限公司 一种低压铸造铝合金熔体的智能控温方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333452A (en) * 1965-03-03 1967-08-01 Sendzimir Inc T Reduction of thick flat articles
DE1288760B (de) * 1966-06-14 1969-02-06 Coupette Verfahren zur Steuerung von Temperatur und Stahlanalyse beim Stranggiessen und Vorrichtung dazu
SU762216A1 (ru) * 1978-10-11 1980-09-07 Boris P Polkov Регулятор мощности многофазной руднотермической электропечи
US4323763A (en) * 1979-05-14 1982-04-06 Gca Corporation Parametric power controller
US4486211A (en) * 1980-06-27 1984-12-04 Energy Fibers Int'l Corp. Apparatus and methods of operation for converting fly ash into high quality mineral wool
JPS58100951A (ja) * 1981-12-09 1983-06-15 Nippon Steel Corp 連続鋳造用溶鋼の温度調整方法
US4484947A (en) * 1983-04-22 1984-11-27 North American Manufacturing Company Method for melting a charge of bulk solid metal
DE3443740A1 (de) * 1984-10-11 1986-04-17 Fried. Krupp Gmbh, 4300 Essen Verfahren und vorrichtung zum halten oder erhoehen der temperatur einer metallschmelze
SU1453631A1 (ru) * 1987-01-07 1989-01-23 Специальное проектно-конструкторское и технологическое бюро электротермического оборудования Производственного объединения "Сибэлектротерм" Способ автоматического регулировани электрического режима дуговой сталеплавильной печи
DE3810292A1 (de) * 1988-03-25 1989-10-05 Rexroth Mannesmann Gmbh Einrichtung zur regelung eines lichtbogenofens durch hydraulische hoehenverstellung der elektrode

Also Published As

Publication number Publication date
KR900017697A (ko) 1990-12-19
US5081640A (en) 1992-01-14
EP0403035A3 (fr) 1991-03-27
JPH03468A (ja) 1991-01-07
EP0403035A2 (fr) 1990-12-19
JP2925655B2 (ja) 1999-07-28
DE59004280D1 (de) 1994-03-03
DE3915619A1 (de) 1990-11-15
ZA903344B (en) 1991-02-27

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