WO2009090000A1 - Procédé de régulation du refroidissement secondaire d'installations de coulée continue - Google Patents

Procédé de régulation du refroidissement secondaire d'installations de coulée continue Download PDF

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Publication number
WO2009090000A1
WO2009090000A1 PCT/EP2009/000013 EP2009000013W WO2009090000A1 WO 2009090000 A1 WO2009090000 A1 WO 2009090000A1 EP 2009000013 W EP2009000013 W EP 2009000013W WO 2009090000 A1 WO2009090000 A1 WO 2009090000A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
air
heat transfer
pressure
control
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
PCT/EP2009/000013
Other languages
German (de)
English (en)
Inventor
Horst Gärtner
Axel Weyer
Jürgen Friedrich
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.)
SMS Siemag AG
Original Assignee
SMS Siemag 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 SMS Siemag AG filed Critical SMS Siemag AG
Publication of WO2009090000A1 publication Critical patent/WO2009090000A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246—Nozzles; Spray heads
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling

Definitions

  • the invention relates to a method for controlling the secondary cooling of the mold with a viable shell leaving cast strand of a slab, thin slab, block, billet or Vorprofilstranggitis, wherein between the guide rollers of the strand guide a water-air mixture as a spray is applied by means of spray nozzles under pressure on the strand surface.
  • Secondary cooling is known as pure water cooling (1-material cooling) and with a water-air mixture (2-material cooling).
  • the spray water nozzles required for water-air cooling are controlled either individually or in groups depending on process parameters such as, for example, casting speed, steel quality, format width, with the required water pressure and / or water volume.
  • the associated air proportion is used here as a fixed setting value (air pressure or volume flow).
  • a device for cooling continuous casting is known with at least one arranged between the guide rollers trough-shaped Zerstäubungsbühne in which emerging from openings and intersecting and penetrating water and air jets of water atomized and this is sprayed onto the surface to be cooled.
  • Diameter of the openings between 0.5 to 5 mm
  • the effect of the secondary cooling water application can be defined by the heat transfer coefficient ⁇ in W / (m 2 K).
  • the heat transfer coefficient ⁇ is a proportionality factor that determines the intensity of heat transfer at an interface. It represents a specific characteristic number of a configuration of materials to a fluid environment.
  • the heat transfer coefficient ⁇ depends, inter alia, on the set air pressure at the nozzle, since with increasing compressed air pressure the total momentum of the cooling medium increases, thereby reducing the insulating vapor layer - which forms on the strand surface during the cooling process. As a result, the heat transfer coefficient ⁇ or the amount of heat extracted or the effect of the cooling is increased.
  • the control of the amount of water and the air pressure is carried out so that a previously determined heat transfer coefficient ⁇ is maintained as a constant value and a change in the control setting for example cost optimization with the same heat transfer coefficient ⁇ is performed.
  • the regulation of the amount of water and of the air pressure is then carried out in such a way that as soon as possible a higher or lower heat transfer coefficient ⁇ is achieved, which deviates from the originally set heat transfer coefficient ⁇ .
  • the method according to the invention is carried out for the adjustment or regulation of individual spray water nozzles or spray water nozzles combined into groups of individual regions and / or subregions of a common strand guide, the air quantity or the air pressure being advantageously changed for regulation at a given water quantity.
  • the water control value determining the water quantity and the air control value determining the air pressure are calculated in a process computer from the process parameters and system parameters, whereby, in addition to the heat transfer coefficient ⁇ , for example the following criteria are taken into account for the calculation of the control values:
  • an extended controllability of the heat transfer coefficient at given fixed further process parameters is achieved with a minimization / optimization of water and / or air consumption values and an extended adjustability of the desired strand surface temperature in the form of a targeted cooling of the casting strand.
  • FIG. 1 is a schematic diagram of the control concept according to the invention
  • Fig. 2 is a control diagram with incorporated heat transfer coefficient ⁇ .
  • FIG 1 is shown as a schematic diagram of the control concept of the invention.
  • a part of a vertically arranged cast strand 3 is supported by guide rollers 5 arranged laterally spaced from one another.
  • a respective Spritzwasserdüse 1 which sprinkles for cooling on the G confusestrangober Assembly conical spray water 2.
  • the control concept for an exemplary spray nozzle 1 ' is located.
  • the quantity of water or air quantity respectively supplied to the spray water nozzle 1 ' is then controlled from the existing water supply 6 or air supply 7, regulated by the water regulating valve 10 and the air regulating valve 11.
  • This regulation is controlled by a respective water volume flow rate meter 14 or air volume flow rate meter 15 arranged upstream of the water control valve 10 or air control valve 11 and by a respective water pressure gauge 8 or air pressure gauge 9 arranged downstream of the water control valve 10 or air control valve 11.
  • FIG. 2 shows the control diagram according to the invention based on the heat transfer coefficient ⁇ as a diagram.
  • the barometric pressure 12 in bar is plotted against the amount of water 13 in l / min and those based on a defined nozzle characteristic and for three different ones Operating conditions valid heat transfer coefficient curves ⁇ 1, ⁇ 2 and ⁇ 3 drawn.
  • Each possible point referred to as control operating point 20 on one of the heat transfer coefficient curves corresponds to a specific control ratio of water quantity 13 and air pressure 12.
  • the control possibilities resulting from this representation are as follows, where ⁇ 1 ⁇ 2 ⁇ 3:
  • the control operating point 20 is displaced according to the displacement direction 21 along the heat transfer coefficient curve ⁇ 1. This corresponds to a control with a constant heat transfer coefficient ⁇ , as it is carried out for cost optimization, for example.
  • a required rapid change of the cooling setting of the control operating point 20 is shifted in the direction 22 to another heat transfer coefficient curve, then further in the direction of displacement 21, with now changed, but constant heat transfer coefficient ⁇ , the amount of water 13 and the air pressure 12th be managed.
  • Air quantity at the nozzle 1 ... 20 Nm 3 / h
  • Air pressure 2 bar (at the nozzle)
  • Variant setting (related to a specific nozzle), water quantity is reduced compared to the basic setting (energy optimization through less water use).
  • Air pressure 3 bar (at the nozzle) Result (actual value) Water pressure: 3 bar

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

Des refroidissements secondaires connus de barres coulées, avec un mélange eau-air, sont commandés individuellement ou en groupes, avec la pression d'eau et/ou le volume d'eau nécessaires, en fonction de paramètres de processus comme par exemple la vitesse de coulée, la qualité d'acier ou la largeur de format. La proportion d'air correspondante est ici utilisée comme valeur de réglage fixe (pression d'air ou débit volumique). L'invention veut fournir une régulation d'un type nouveau pour un refroidissement avec de telles buses à 2 substances, qui présente comme composante supplémentaire essentielle une régulation variable de la proportion d'air (pression ou volume). A cet effet, selon l'invention, on utilise comme variables réglées la quantité d'eau (13) et la quantité d'air, cette dernière sous forme de pression d'air (12) pour une courbe caractéristique de buse donnée, en utilisant le coefficient de transfert de chaleur (a) déterminé à partir de données (18, 19) de processus, de matériau et d'installation.
PCT/EP2009/000013 2008-01-18 2009-01-06 Procédé de régulation du refroidissement secondaire d'installations de coulée continue Ceased WO2009090000A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008004911.5 2008-01-18
DE102008004911.5A DE102008004911B4 (de) 2008-01-18 2008-01-18 Verfahren zur Regelung der Sekundärkühlung von Stranggießanlagen

Publications (1)

Publication Number Publication Date
WO2009090000A1 true WO2009090000A1 (fr) 2009-07-23

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PCT/EP2009/000013 Ceased WO2009090000A1 (fr) 2008-01-18 2009-01-06 Procédé de régulation du refroidissement secondaire d'installations de coulée continue

Country Status (3)

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DE (1) DE102008004911B4 (fr)
TW (1) TW200940207A (fr)
WO (1) WO2009090000A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT512425A1 (de) * 2012-01-24 2013-08-15 Siemens Vai Metals Tech Gmbh Strangführungsrolle und strangführung für eine stranggiessmaschine
CN103357834A (zh) * 2013-07-05 2013-10-23 苏州有色金属研究院有限公司 用于铸造过程二冷却区换热系数测量装置
EP2712691A1 (fr) 2012-09-27 2014-04-02 SMS Siemag AG Dispositif et procédé de refroidissement secondaire dans une installation de coulée
CN105973931A (zh) * 2016-04-27 2016-09-28 中国重型机械研究院股份公司 钢坯传热实验台
CN106735028A (zh) * 2016-12-20 2017-05-31 中冶连铸技术工程有限责任公司 生产异型坯的连铸机的喷嘴布置方法及系统
CN106825471A (zh) * 2016-12-20 2017-06-13 中冶连铸技术工程有限责任公司 方坯连铸机和板坯连铸机的喷嘴布置方法及系统
CN116037879A (zh) * 2023-02-08 2023-05-02 山东莱钢永锋钢铁有限公司 一种小方坯连铸机的二冷段智能配水方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009034847A1 (de) * 2009-07-27 2011-02-03 Sms Siemag Ag Vorrichtung und Verfahren zur geregelten Sekundärkühlung einer Stranggießanlage
EP2571641B1 (fr) 2010-05-19 2015-07-08 SMS Siemag AG Système de guidage
CN102699298A (zh) * 2012-06-29 2012-10-03 秦皇岛首秦金属材料有限公司 一种有效控制连铸特厚板坯表面裂纹的方法
DE102016215977A1 (de) * 2016-02-24 2017-08-24 Sms Group Gmbh Düsenreihenanordnung und Düsenfeld zum Einbau in Rollenspalte zwischen zwei Strangführungsrollen
CN109014102B (zh) * 2018-09-21 2020-07-17 中冶赛迪工程技术股份有限公司 高拉速中薄板坯连铸机二次冷却方法
CN113245519B (zh) * 2021-04-29 2022-07-15 北京科技大学 一种连铸方坯二冷水量的动态控制方法及系统
DE102022206953A1 (de) * 2022-07-07 2024-01-18 Sms Group Gmbh Strangführungsvorrichtung und Verfahren für deren Umrüstung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0036342A1 (fr) * 1980-03-13 1981-09-23 FIVES-CAIL BABCOCK, Société anonyme Procédé de contrôle du refroidissement du produit coulé dans une installation de coulée continue
DE3127348A1 (de) * 1980-07-10 1982-02-25 Nippon Steel Corp., Tokyo Verfahren und vorrichtung zum kuehlen einer stranggegossenen bramme
EP0076743A1 (fr) * 1981-10-02 1983-04-13 FIVES-CAIL BABCOCK, Société anonyme Procédé de refroidissement du produit coulé dans une installation de coulée continue

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU71487A1 (fr) 1974-01-04 1975-06-17

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0036342A1 (fr) * 1980-03-13 1981-09-23 FIVES-CAIL BABCOCK, Société anonyme Procédé de contrôle du refroidissement du produit coulé dans une installation de coulée continue
DE3127348A1 (de) * 1980-07-10 1982-02-25 Nippon Steel Corp., Tokyo Verfahren und vorrichtung zum kuehlen einer stranggegossenen bramme
EP0076743A1 (fr) * 1981-10-02 1983-04-13 FIVES-CAIL BABCOCK, Société anonyme Procédé de refroidissement du produit coulé dans une installation de coulée continue

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT512425A1 (de) * 2012-01-24 2013-08-15 Siemens Vai Metals Tech Gmbh Strangführungsrolle und strangführung für eine stranggiessmaschine
EP2712691A1 (fr) 2012-09-27 2014-04-02 SMS Siemag AG Dispositif et procédé de refroidissement secondaire dans une installation de coulée
CN103357834A (zh) * 2013-07-05 2013-10-23 苏州有色金属研究院有限公司 用于铸造过程二冷却区换热系数测量装置
CN105973931A (zh) * 2016-04-27 2016-09-28 中国重型机械研究院股份公司 钢坯传热实验台
CN105973931B (zh) * 2016-04-27 2019-04-02 中国重型机械研究院股份公司 钢坯传热实验台
CN106735028A (zh) * 2016-12-20 2017-05-31 中冶连铸技术工程有限责任公司 生产异型坯的连铸机的喷嘴布置方法及系统
CN106825471A (zh) * 2016-12-20 2017-06-13 中冶连铸技术工程有限责任公司 方坯连铸机和板坯连铸机的喷嘴布置方法及系统
CN106735028B (zh) * 2016-12-20 2019-01-01 中冶连铸技术工程有限责任公司 生产异型坯的连铸机的喷嘴布置方法及系统
CN106825471B (zh) * 2016-12-20 2019-01-11 中冶连铸技术工程有限责任公司 方坯连铸机和板坯连铸机的喷嘴布置方法及系统
CN116037879A (zh) * 2023-02-08 2023-05-02 山东莱钢永锋钢铁有限公司 一种小方坯连铸机的二冷段智能配水方法

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Publication number Publication date
DE102008004911A1 (de) 2009-07-23
TW200940207A (en) 2009-10-01
DE102008004911B4 (de) 2025-02-13

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