WO2011038800A1 - Dispositif et procédé de refroidissement secondaire commandé d'une installation de coulée continue - Google Patents

Dispositif et procédé de refroidissement secondaire commandé d'une installation de coulée continue Download PDF

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Publication number
WO2011038800A1
WO2011038800A1 PCT/EP2010/004563 EP2010004563W WO2011038800A1 WO 2011038800 A1 WO2011038800 A1 WO 2011038800A1 EP 2010004563 W EP2010004563 W EP 2010004563W WO 2011038800 A1 WO2011038800 A1 WO 2011038800A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
network
cooling medium
valves
cooling
Prior art date
Application number
PCT/EP2010/004563
Other languages
German (de)
English (en)
Inventor
Markus Reifferscheid
Erich Hovestädt
Original Assignee
Sms Siemag Aktiengesellschaft
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 Aktiengesellschaft filed Critical Sms Siemag Aktiengesellschaft
Priority to EP10745530A priority Critical patent/EP2459335A1/fr
Priority to CN2010800333495A priority patent/CN102470430A/zh
Publication of WO2011038800A1 publication Critical patent/WO2011038800A1/fr

Links

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
    • B22D11/16—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
    • 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

Definitions

  • the invention relates to a device for controlled secondary cooling with a traversed by a cooling medium network of a continuous casting, which is adaptable to the respective casting task, in particular with regard to the steel grade and special tasks resulting during the casting process.
  • the solidification is achieved by the primary cooling of the steel in the mold and the secondary cooling in the region of the strand guide.
  • water or a water-air mixture is injected under pressure in the area between the strand guide rollers remaining free areas directly on the strand shell; As a result, heat is removed from the strand.
  • CONFIRMATION COPY it is necessary to set a uniform over the width of the strand temperature so that, for. B. in the directional area, no cracks due to cold slab edges arise. This problem is solved by separately controlled spray zones, which cover different casting widths. In this case, a separate control loop is required for each width zone.
  • the secondary cooling is realized in continuous casting, that the actuators for the secondary cooling outside the segment are in the water distribution space.
  • the amount of water can be set for a control loop.
  • the current amount of water is determined for a control loop by means of a flow measurement within the controlled system.
  • the amount of water set by the control loop is transferred to the segment by means of a water clamping plate of the segment and injected there via lines and nozzles onto the slab surface. Sealing elements on the clamping plate ensure that in the case of segment installation the coupling of the media is tight.
  • a strand guide in a system for casting a metal strand in a casting direction A has a plurality of segments 1 arranged one behind the other in the casting direction.
  • Each segment 1 has two or more injection zones 2, 3, which are usually operated depending on the width of the strand to be cast. For example, for a narrow strand only nozzles 4 belonging to the spray zone 2 are used, while For a wide strand nozzles 5 of the spray zone 3 either alone or in conjunction with the nozzles 4 are used.
  • the reference numeral 1a denotes the rollers of the strand guide segment. 1
  • volumetric flow controller 11 or 12 For each zone 2, 3 there is a volumetric flow controller 11 or 12, by means of which, for each of the zones 2, 3, the volumetric flow is set in accordance with the desired cooling capacity.
  • the volume flow controllers 11, 12 are each preceded by a pump 9, 10 for supplying the cooling medium, in particular the water, to the volume flow controllers and the zones.
  • a pressure gauge 3, 14 it is possible by means of a pressure gauge 3, 14 to determine the pressure in each of the control circuits 6, 7; However, this is not used for the control process.
  • the water tension plate 15 is the location of media transfer between the water distribution space 8 and the segment, d. H.
  • This embodiment has segments that may be simple in terms of instrumentation and control devices, with only the nozzle bars and tubing being made on each segment, thereby minimizing the probability of failure. There is only a comparatively small number of actuators available, which in turn are easily accessible.
  • the disadvantages of this embodiment are that a plurality of pipelines with associated measuring and control organs is present in the water distribution space. Likewise, many pipelines are available for the different control circles on the segment required. The water and air transfer to the segment on the water plates is because of the large number of control loops consuming, since for each zone of a segment or a segment group a control loop in the water distribution space is required to adjust the total amount of water.
  • a method for the thermal surface treatment of strands of fine-grained structural steel in a continuous casting machine is known, which is associated with a heating furnace for heating the strands of a hot batch to the elimination of compounds of aluminum, vanadium, niobium and and to eliminate or at least substantially reduce surface defects due to stress.
  • the continuous casting machine used for this purpose has a mold, a secondary cooling chamber, an extraction and alignment unit and a cutting unit.
  • the method used here comprises a first cooling step for strands within the secondary cooling chamber and a second cooling step for strands in front of the cutting unit.
  • the method is characterized by surface quenching of the outer layer of the strands by means of a second cooling step achieved by intensive and concentrated cooling of the surface of the strands to control the surface temperature of the strands after the natural annealing caused by the hot core of the strands about 400 ° C and about 900 ° C, wherein this intensive and concentrated cooling is realized by spraying a water-based cooling fluid under pressure against the surface of the strands through a plurality of spray nozzles.
  • the intensive and concentrated cooling depends on the dimensions of the strands and is applied immediately or immediately after the stripping and aligning step by the stripping and aligning unit.
  • the network comprises at least a first pressure network, in which the pressure of the cooling medium is used as a task size.
  • the invention is based on the idea not to provide an amount of a cooling medium, but to provide a pressure, according to which then remove all consumers within the cooling system, the required amount of the cooling medium.
  • devices for measuring the characteristic curves of nozzles assigned to the segments or segment groups can also be provided which, in the case of a fixed opening position of a valve, measure the flow through the control group assigned to the valve. It is possible to carry out wear measurements of the actuator groups and to update the characteristic curves according to the current wear. The same applies in the case of a clogging of the network.
  • a device for cooling provided in the per segment or segment group control over an associated controller or via a bus interface of a central control bus is.
  • the controlled distribution per segment it must be accepted that small errors can occur when adjusting the water quantities.
  • a filled with the cooling medium buffer memory is provided as a volume memory, which is in pressure communication with the pressure network.
  • nozzles associated with a single valve can be individually calibrated as actuators.
  • nozzle modules ie a plurality of nozzles associated with a valve, as “actuators”
  • valves For example, it is provided that groups of nozzles, in particular nozzle rows, can be switched on and off by means of a valve assigned to them.
  • the valves set different, discrete amount of the cooling medium by switching.
  • the drive of the valves takes place for example via a stepper motor. Since one can set different values from segment to segment, overall good overall cooling can be achieved by setting various discrete values.
  • the valves set different, discrete amounts of the cooling medium by switching, or the valves are controllable.
  • the valves are designed as proportional valves, as stepped valves, as on / off valves or as volume flow control devices.
  • the network comprises at least one volume flow regulator for adjusting the volume flow per control loop and that the coolant can be divided by means of setting members into a plurality of sub-circuits corresponding to pressure-volume flow characteristics.
  • a pressure gauge measures the pressure, and the adjusting members, taking into account the pressure measured by the pressure gauge and the pressure-volume flow characteristic corresponding to the respective setting of the adjusting member, divide the coolant into the respective associated sub-circuit.
  • the net includes pressure gauges for measuring the pressure Pressure gauges measured pressure values are then taken into account in the adjustment.
  • the network in the region of the distribution space on a single line can be supplied via the pumped by a pump coolant to clamping plates of segments, wherein branches of the conduit in the region of the clamping plates and / or the segments are arranged.
  • the cooling system according to the invention can be realized both with one-component cooling (only water as coolant) and with two-component cooling (water and air as coolant).
  • the invention relates to a device for controlled secondary cooling with a flowed through by a cooling medium network of a continuous casting plant, which is characterized in that a pump control loop or by a constant pressure network provides the necessary amount of the cooling medium and the quantitative distribution on the segments within the strand guide by valves with defined open positions (open, half open, etc.) or by proportional valves.
  • An inventive device for controlled secondary cooling is inventively advantageously characterized in that a pump control loop provides the necessary amount of the cooling medium is available and the quantitative distribution on the segments within the strand guide by valves with defined open positions (open, half open, etc.) or by proportional valves.
  • a continuous casting plant for distributing the cooling medium in the continuous casting plant and / or on a segment serving active actuators, in particular valves and / or regulators, on the segments.
  • the invention also relates to a method for regulated secondary cooling with a network of a continuous casting plant through which a cooling medium flows.
  • the method is inventively characterized in that the pressure of the cooling medium is regulated.
  • valves can be used in various configurations.
  • the valves are operated, for example, as on / off valves, as discrete or continuously switchable valves.
  • the pressure-volumetric flowcharts are calibrated at specific time intervals. However, the calibration preferably takes place outside of the casting operation in the continuous casting plant.
  • FIG. 2 shows a schematic illustration of a segment of a strand guide in a continuous casting installation with devices for supplying a cooling liquid, wherein two adjustment elements are provided in the region of the segment, FIG.
  • FIG. 4 shows an alternative embodiment for supplying a segment of the strand guide with cooling liquid, wherein within a segment three adjusting members are provided, and
  • Fig. 5 shows another embodiment for supplying a segment of
  • a first embodiment according to the invention provides that in a strand guide constructed as in the prior art in a system for casting a metal strand in a casting direction A, a plurality of segments 1 arranged one behind the other in the casting direction is provided , Each segment 1 has two or more spray zones 2, 3, which are operated depending on the width of the strand to be cast.
  • the same reference numerals are used for this purpose as in Figure 1.
  • the embodiment according to the invention differs according to FIG. 2 in that instead of two volumetric flow controllers 11, 12, only one volumetric flow regulator 19 is required in a coolant or water distribution chamber 8 and an upstream pump 18.
  • only a single connection 20 for supplying the coolant to the supply lines within the two zones 2, 3 within the segment 1 is also required in the area of the water clamping plate 8.
  • two adjusting members 21, 22 for distributing the coolant are arranged on the segment 1 of the two injection zones 2, 3 associated sub-circuits.
  • the adjusting members 21, 22 are separately controllable or controllable or manually adjustable valves.
  • proportional valves, tap-change valves or valves which have only one open position and one closed position are suitable.
  • control valves these receive their controlled variables from the control of the continuous casting plant.
  • the pressure value of the coolant obtained in a pressure gauge 23 is taken into account.
  • Each of the two sub-circuits for the two zones 2, 3 has its own pressure-volume flow characteristic for the volume flow V, for example, measured in liters per minute, as a function of the refrigerant pressure p, for example, measured in bar, as shown in Fig. 3 , Wherein each opening state of the adjusting members 21, 22 has its own characteristic. This means that any change in the permeability of the coolant within the two SubKreissheet is taken into account according to the invention. If this is reduced by gradual clogging of the conduits due to contaminants remaining in the tubes, or if the adjusters 21, 22 are no longer adjustable to the same extent as was the case with the new insert, then this circumstance flows into the mold the pressure-volume flow characteristic, which must be recalibrated at certain intervals.
  • volume flow controller 19 using the pressure obtained by the pressure gauge 23 can adjust a summed flow for both zones 2, 3, with the help of associated opening degree of the two adjusting members 21, 22 is decomposed into the required for the two zones 2, 3 partial flow rates or partial pressures.
  • FIG. 4 Similar to the procedure explained with reference to FIGS. 2, 3, according to a further embodiment (FIG. 4), three setting members 24, 25 and 26 are provided on the segment, each one strand 27, 28, 29 within the conduit system for the supply of the two Zones 2, 3 are assigned.
  • the Volumetric flow for both zones 2, 3 determined in the volumetric flow controller 19 and divided into the required for the three strands 27, 28, 29 partial flow rates on the basis of the adjusting members 24, 25 and 26.
  • FIGS. 2 and 4 have in common that the volume flow per control loop is set, the pressure information in each case flowing into the coolant distribution.
  • the coolant distribution is realized by the respective adjusting members, each subcircuit has its own characteristic, which depends on the position of the adjusting (open, half open, ... etc.). With known pressure or known characteristic ratio, the coolant distribution is fixed.
  • control elements are supplied on the segment of a constant current network, wherein the volume flow per control loop is set; in this case, the knowledge of the pressure information is irrelevant to the operation.
  • FIG. 5 instead of a single volumetric flow regulator 19 accommodated in the coolant distribution chamber 8, three individual volumetric flow regulators 36, 37, which are provided in the region of the segment 1 and serve directly as setting elements for regulating the coolant quantity in the strands 27, 28, 29 and 38 arranged one behind the other.
  • one control loop can be used per segment or per segment group in the water distribution space. In this case, it must be checked how many control loops are required in total.
  • the total amount of water is adjusted via a control loop in the water distribution space.
  • Subdivision on the segment or segments can be done that by means of actuators on the segment, the coolant, in particular the water is distributed to other control or regulating circuits.
  • the quantities of water in the "water circuits" of the segment are no longer measured, but actuators, such as valves, are set to specific positions.
  • the actuators are set, for example, with stepper motors to predetermined positions. This will set a desired flow. Since all segments are independently adjustable, it is sufficient to provide few discrete setting options (for example four positions: off, low, medium, high). In extreme cases, such valves can be used as switching elements, which only have an open and a closed position.

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

Abstract

L'invention concerne un dispositif de refroidissement secondaire commandé présentant un réseau d'une installation de coulée continue à travers lequel circule un fluide réfrigérant. Ledit dispositif peut s'adapter à une tâche de coulée spécifique, en particulier en ce qui concerne le type d'acier, et à des tâches particulières apparaissant lors du processus de coulée. Le dispositif est caractérisé en ce que le réseau comprend au moins un premier réseau de pression, dans lequel la pression est introduite en tant que grandeur prescrite. Le réseau présente une pluralité de dérivations pour des groupes de réglage, en particulier pour chaque segment (1) ou chaque groupe de segments (2, 3), dans une chambre de répartition (8) du fluide réfrigérant, des appareils (23) permettant de mesurer la pression et/ou de mesurer le débit pour chaque dérivation.
PCT/EP2010/004563 2009-07-27 2010-07-26 Dispositif et procédé de refroidissement secondaire commandé d'une installation de coulée continue WO2011038800A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10745530A EP2459335A1 (fr) 2009-07-27 2010-07-26 Dispositif et procédé de refroidissement secondaire commandé d'une installation de coulée continue
CN2010800333495A CN102470430A (zh) 2009-07-27 2010-07-26 用于调节连铸设备二次冷却的装置和方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009034847.6 2009-07-27
DE102009034847A DE102009034847A1 (de) 2009-07-27 2009-07-27 Vorrichtung und Verfahren zur geregelten Sekundärkühlung einer Stranggießanlage

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WO2011038800A1 true WO2011038800A1 (fr) 2011-04-07

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PCT/EP2010/004563 WO2011038800A1 (fr) 2009-07-27 2010-07-26 Dispositif et procédé de refroidissement secondaire commandé d'une installation de coulée continue

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EP (1) EP2459335A1 (fr)
CN (1) CN102470430A (fr)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011144266A1 (fr) * 2010-05-19 2011-11-24 Sms Siemag Ag Dispositif de guidage de barres
WO2012069234A1 (fr) * 2010-11-23 2012-05-31 Sms Siemag Ag Dispositif et procédé permettant le refroidissement secondaire régulé d'une installation de coulée continue
DE102013214810A1 (de) 2013-07-30 2015-02-05 Sms Siemag Aktiengesellschaft Vorrichtung und Verfahren zur gesteuerten Sekundärkühlung eines gegossenen Metallstrangs
DE102013214809A1 (de) 2013-07-30 2015-02-05 Sms Siemag Aktiengesellschaft Vorrichtung und Verfahren zur gesteuerten Mehrstoff-Sekundärkühlung eines gegossenen Metallstrangs
CN111185585A (zh) * 2020-03-19 2020-05-22 山东钢铁股份有限公司 一种连铸机气动式调节阀备用切换系统及其控制方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2527061A1 (fr) * 2011-05-27 2012-11-28 Siemens VAI Metals Technologies GmbH Procédé de refroidissement d'un faisceau métallique et vanne de commande pour l'ouverture et la fermeture intermittentes d'un flux volumique d'un fluide de refroidissement
DE102016215977A1 (de) * 2016-02-24 2017-08-24 Sms Group Gmbh Düsenreihenanordnung und Düsenfeld zum Einbau in Rollenspalte zwischen zwei Strangführungsrollen
CN105728680B (zh) * 2016-05-04 2017-09-22 上海耀秦冶金设备技术有限公司 连铸机气水平衡动态控制方法
CN110625080B (zh) * 2019-09-23 2022-04-26 中冶南方连铸技术工程有限责任公司 连铸二冷系统在线工作状态的智能检控方法

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US3261556A (en) * 1964-10-06 1966-07-19 United States Steel Corp Constant pressure variable demand hydraulic system
US3480211A (en) * 1968-11-18 1969-11-25 Gamma Eng Ltd Spray control mechanism for continuous casting machines
JPS57139460A (en) * 1981-02-20 1982-08-28 Kawasaki Steel Corp Control method for secondary cooling water in continuous casting installation
JPS57206559A (en) * 1981-06-16 1982-12-17 Fuji Electric Co Ltd Control method for flow rate of secondary cooling water of continuous casting installation
JPS5877760A (ja) * 1981-10-30 1983-05-11 Sumitomo Heavy Ind Ltd 連続鋳造機における２次冷却水の制御方法
EP0650790A1 (fr) * 1993-10-29 1995-05-03 DANIELI & C. OFFICINE MECCANICHE S.p.A. Procédé et dispositif pour le traitement thermique de la surface d'un lingot
EP1550523A1 (fr) 2004-01-03 2005-07-06 SMS Demag AG Régulation diversifié du refroidissement secondaire dans une installation de coulée continue
DE102008004911A1 (de) * 2008-01-18 2009-07-23 Sms Demag Ag Verfahren zur Regelung der Sekundärkühlung von Stranggießanlagen

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US4009750A (en) * 1972-09-06 1977-03-01 Concast Ag Apparatus for controlling the cooling of a strand emanating from a continuous casting mold
CH572370A5 (fr) * 1974-02-28 1976-02-13 Concast Ag
JP4351068B2 (ja) * 2002-02-22 2009-10-28 エス・エム・エス・ジーマーク・アクチエンゲゼルシャフト 鋼材から成る鋳造ストランドの連続鋳造及び直接変形をするための方法及び装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3261556A (en) * 1964-10-06 1966-07-19 United States Steel Corp Constant pressure variable demand hydraulic system
US3480211A (en) * 1968-11-18 1969-11-25 Gamma Eng Ltd Spray control mechanism for continuous casting machines
JPS57139460A (en) * 1981-02-20 1982-08-28 Kawasaki Steel Corp Control method for secondary cooling water in continuous casting installation
JPS57206559A (en) * 1981-06-16 1982-12-17 Fuji Electric Co Ltd Control method for flow rate of secondary cooling water of continuous casting installation
JPS5877760A (ja) * 1981-10-30 1983-05-11 Sumitomo Heavy Ind Ltd 連続鋳造機における２次冷却水の制御方法
EP0650790A1 (fr) * 1993-10-29 1995-05-03 DANIELI & C. OFFICINE MECCANICHE S.p.A. Procédé et dispositif pour le traitement thermique de la surface d'un lingot
EP0650790B1 (fr) 1993-10-29 2002-08-14 DANIELI & C. OFFICINE MECCANICHE S.p.A. Procédé et dispositif pour le traitement thermique de la surface d'un lingot
EP1550523A1 (fr) 2004-01-03 2005-07-06 SMS Demag AG Régulation diversifié du refroidissement secondaire dans une installation de coulée continue
DE102008004911A1 (de) * 2008-01-18 2009-07-23 Sms Demag Ag Verfahren zur Regelung der Sekundärkühlung von Stranggießanlagen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011144266A1 (fr) * 2010-05-19 2011-11-24 Sms Siemag Ag Dispositif de guidage de barres
WO2012069234A1 (fr) * 2010-11-23 2012-05-31 Sms Siemag Ag Dispositif et procédé permettant le refroidissement secondaire régulé d'une installation de coulée continue
DE102013214810A1 (de) 2013-07-30 2015-02-05 Sms Siemag Aktiengesellschaft Vorrichtung und Verfahren zur gesteuerten Sekundärkühlung eines gegossenen Metallstrangs
DE102013214809A1 (de) 2013-07-30 2015-02-05 Sms Siemag Aktiengesellschaft Vorrichtung und Verfahren zur gesteuerten Mehrstoff-Sekundärkühlung eines gegossenen Metallstrangs
CN111185585A (zh) * 2020-03-19 2020-05-22 山东钢铁股份有限公司 一种连铸机气动式调节阀备用切换系统及其控制方法

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Publication number Publication date
CN102470430A (zh) 2012-05-23
DE102009034847A1 (de) 2011-02-03
EP2459335A1 (fr) 2012-06-06

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