EP2643109A1 - Dispositif et procédé permettant le refroidissement secondaire régulé d'une installation de coulée continue - Google Patents

Dispositif et procédé permettant le refroidissement secondaire régulé d'une installation de coulée continue

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Publication number
EP2643109A1
EP2643109A1 EP11760498.3A EP11760498A EP2643109A1 EP 2643109 A1 EP2643109 A1 EP 2643109A1 EP 11760498 A EP11760498 A EP 11760498A EP 2643109 A1 EP2643109 A1 EP 2643109A1
Authority
EP
European Patent Office
Prior art keywords
pressure
control
cooling
cooling medium
segments
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.)
Granted
Application number
EP11760498.3A
Other languages
German (de)
English (en)
Other versions
EP2643109B2 (fr
EP2643109B1 (fr
Inventor
Andreas Naujock
Axel Stavenow
Axel Weyer
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 Group GmbH
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
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Application filed by SMS Siemag AG filed Critical SMS Siemag AG
Publication of EP2643109A1 publication Critical patent/EP2643109A1/fr
Application granted granted Critical
Publication of EP2643109B1 publication Critical patent/EP2643109B1/fr
Publication of EP2643109B2 publication Critical patent/EP2643109B2/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B22D11/12—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 device for controlled secondary cooling with one of a cooling medium through which a net continuous casting plant, 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 remaining between the strand guide rollers areas directly on the strand shell; As a result, heat is withdrawn from the strand.
  • Continuous casting plants for example slab, thin slab or continuous casting plants, have a series of segments for strand guidance, the number of which is determined by the respective product spectrum. They can consist of up to twenty segments with a corresponding roller conveyor. In each segment, between two and ten rolls or partial rolls, ie rolls with a corresponding pitch, are arranged in each segment frame. The steel casting plant and the segments are superimposed on several cooling zones. The cooling zones can cover one segment, but they can also extend over several segments. There is also the possibility that only parts of a segment are part of a cooling zone. The segment itself can, seen in the product direction, also have multiple shared cooling zones.
  • a Stahlg screenstrom is preferably equipped with up to eighty or more control loops, wherein each cooling zone, a control loop is provided.
  • the cooling medium is applied to the product via at least one spray nozzle in order to cool the product according to the requirements.
  • the individual control circuits are designed with single, dual or multi-fuel cooling systems.
  • water is used as the coolant.
  • the amount of water is used.
  • the coolant is also supplied to the product via special spray nozzles.
  • appropriate additives such as compressed air are supplied to the water at the spray nozzle here.
  • Dual-fluid cooling systems enable more efficient cooling and create more options for influencing the cooling effect. Thus, even smaller amounts of water can be realized while maintaining the required spray pattern by uniform application of the coolant to the product.
  • the secondary cooling actuators are outside the segment in the water distribution space.
  • the amount of water can be set for a control loop.
  • the current Amount of water allowed for one 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.
  • EP 0 650 790 B1 discloses a process for the thermal surface treatment of fine grained structural steel strands in a continuous casting machine, which is associated with a heating furnace for heating the strands of a hot batch in order to eliminate the precipitation of compounds of aluminum, vanadium, niobium and the like 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, through the hot core of the strands temperature- between about 400 ° C and about 900 ° C, this intensive and concentrated cooling being 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 required cooling effect is regulated via the water volume flow supplied to the product.
  • the other amounts of substance are also taken into account, as these also influence the cooling effect.
  • All systems are linked to a central data collection system which, based on material specifications and other information and evaluations with regard to input materials, product and metrological information, calculate the setpoint water quantities per cooling zone and transfer this information to the associated control devices as a reference variable.
  • a flow corresponding to the nozzle adjusts a water pressure, regardless of whether it is a one-, two- or multi-fluid nozzles; However, the substances supplied to the nozzle influence each other. If, for example, a constant amount of water is applied to a two-fluid nozzle at a constant air pressure, then a constant water pressure and a constant air volume are established. By varying the amount of water, a new equilibrium between water pressure and air volume is established.
  • the patent application DE 10 2009 034 847.6 proposes a device for regulated secondary cooling in which the network comprises at least a first pressure network in which the pressure of the cooling medium is used as a task variable.
  • the network comprises at least a first pressure network in which the pressure of the cooling medium is used as a task variable.
  • the at least one pressure network comprises at least one self-regulating pressure control element. This means that the pressure regulating member is self-acting.
  • control loops are completely redesigned, with the following structure is realized: It is a common pressure measurement (input pressure), a flow measurement (sensor for the amount of water) and an adjustable by external pressure control valve used as a pressure control element.
  • the control element By using the automatic pressure control element, which operates without the use of external energy, the control element can be placed both in front of the segment, for example in a media room, ie the current standard location. The fact that the location is located on the segment is facilitated or even made possible by the technology of the automatic control element, since the use of electrical or other auxiliary energy is avoided and also the manipulated variable is fed to the pressure regulator without any electrotechnical assistance.
  • the manipulated variable is supplied to the pressure regulating member via a separate pneumatic or hydraulic line.
  • the control element uses as an auxiliary energy to be controlled medium itself, so preferably the water; but also the compressed air can be used for this purpose.
  • Each control circuit thus requires at least one self-regulating pressure control element. When placing the pressure regulators on the segment except one corresponding coolant supply line and externally specified control variable (hydraulics or pneumatics) requires no further connections for media or energy.
  • Invention is provided a fine mesh distribution of water distribution.
  • the cooling medium is either a single fluid, in particular water, or a mixture of two or more fluids, for example water and compressed air.
  • the at least one pressure network comprises at least one self-regulating pressure regulating member.
  • the pressure regulating member is advantageously a control valve or switching valve to which an external pressure is supplied as a manipulated variable.
  • the external pressure is supplied as the manipulated variable to the pressure regulating member via a separate pneumatic or hydraulic line.
  • the pressure control element can be arranged particularly convenient on or on a segment.
  • the invention preferably provides that the at least one pressure network coupling separation points, in particular at the transition between the pressure lines and the segments comprises.
  • the coupling separating points are formed, for example, as water chucks.
  • the pressure control elements can be arranged in front of or behind the coupling separating points, with reference to the direction of flow.
  • self-regulating switching or control valves with hydraulic or pneumatic damagessdorfnbeaufschlagung be used for controlling or regulating the secondary water quantity with arrangement in the water distribution space for single-fluid or two-fluid cooling.
  • the valves are placed in front of the coupling disconnector, i. H. in front of the water chuck, so for example in the media room, used.
  • the valves are used behind the clutch disconnect, that is on or on the respective segment.
  • any number of cooling zones can be realized without the need for expansion measures on the line pipework.
  • the distribution of the water supply always takes place in the flow direction behind the coupling separation point (water tension plate).
  • a constant pressure network is not required because you can measure the characteristics at any time.
  • the prerequisite for this is that organs are provided for pressure measurement or flow measurement per segment or per segment group, ie per branch.
  • the prerequisite here is that there must be no large pressure drops in the pipeline to the valve at full volume flow.
  • 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”
  • the network in the region of the distribution space only a single coolant supply line can be supplied via the pumped by a pump coolant to clamping plates of segments, wherein branches of the line 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 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.
  • a device according to the invention for controlled secondary cooling is inventively advantageously characterized in that a pump loop the required amount of the cooling medium regulated provides 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 device for controlled secondary cooling with a continuous flow of a cooling medium network of a continuous casting for distributing the cooling medium in the continuous casting and / or serving on a segment active actuators, in particular valves and / or regulators on the segments.
  • each of the segments may have a plurality of groups of nozzles, each of which is advantageously associated with a single valve, the nozzles associated therewith being individually calibrated.
  • the invention also relates to an apparatus and a method for controlled 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.
  • the direct pressure control in conjunction with the proximity to the consumer also allows a much faster response to any disturbances, resulting in that pressure surges of the cooling medium are reduced at the consumer.
  • a nozzle failure caused, for example, by a blockage is quickly detected, since the coolant quantity is regulated directly via the pressure.
  • the resulting calmed pressure situation at the consumer also favors the uniform application of the cooling medium and in turn leads to an improvement in the surface quality and the structural quality of the cast product.
  • the required temperatures can be set better and faster over the entire strand width of the metal strand; this leads to an overall improvement of the surfaces and the structural quality of the metal strand.
  • the piping outside the casting machine and the strand guide can be significantly reduced.
  • Also required by the prior art water distribution space can be omitted. These measures will save a considerable amount of costs.
  • the usually present volumetric flow measurement can be omitted if one concludes from the self-adjusting pressure of the cooling medium at the nozzle (control result) and the nozzle characteristic curves and interpretations on the consumption of the cooling medium and refrains from verifying this result by a volume flow measurement.
  • the equipment can easily be converted to the segment.
  • control loops can also have an improving effect on the surface quality of the cast product if special cooling strategies compensate for disadvantages of conventional cooling using a smaller number of control loops, which in turn has a positive effect on the production costs.
  • the use of the technology results in the advantage, particularly in the case of retrofits or extensions of existing systems, of a cost-effective or, by the use of the invention, of an economic reality that is even more economical. tion.
  • the cost savings result from the fact that an otherwise additional route piping is no longer needed.
  • the measuring technology is also simplified.
  • the reduction in the total quantity of coolant can be deliberately compensated by deliberately increasing the preselected pressure.
  • the pressure specifications of each automatic pressure control element can be switched equal.
  • the volume flow measurement is then used in the control loop as the actual value, the desired volume flow as a reference variable (setpoint) and the pressure specifications of each automatic pressure control element as a manipulated variable. If the manipulated variables are combined, the actual value can be correspondingly influenced by their change in order to achieve the reference variable.
  • the coolant distribution can be realized while maintaining the total coolant flow. Of course, so can the conditions with changed coolant flow rates can be realized.
  • control result occurs in the case of the arrangement of the automatic pressure control elements on the segments, since then the distance between the pressure regulating member and the consumer, d. H. the nozzle is significantly lower.
  • the control path has a lower regulatory order, so that the control result is in a higher range of accuracy than the standard case, in which the control element is placed in a media room and thus considerable distances and height differences to be bridged and taken into account.
  • the pressure control can be used to take over the control in case of failure of the flow measurement and continue to operate the system despite this failure.
  • the pressure control can be activated. It is thus possible to continue operating the system with defective volumetric flow measurement without affecting it. This redundancy can increase the availability of each individual volume flow control and thus also the overall availability of the system.
  • self-regulating control valves or switching valves with pneumatic or hydraulic pilot quantity application advantageously regulate the pressure of the cooling medium.
  • the common volume flow measurement is used as the actual value and compared with a reference variable.
  • the result of the control is converted into a pressure and supplied as a pneumatic or hydraulic damagessdorfnbeaufschlagung the self-regulating control or switching valves.
  • the volume flow supplied to the line can thus be regulated.
  • the self-regulating control or switching valves are placed on the segment, only a common route piping is needed. Due to the proximity of the self-regulating control or switching valves to the consumer and the associated lower regulatory technical order, the control element can easily compensate for any pressure fluctuations that occur automatically.
  • the invention provides a total volume flow control with a partial flow control; Also by this aspect of the invention, the control result is improved.
  • the invention also provides a failure strategy for volumetric flow measurement, for example in the event of failure of the volumetric flow measurement.
  • a pump control loop or a constant pressure network the amount of cooling medium, in particular the amount of water holds, and the quantitative distribution on the segments of the strand guide in or across the casting direction is made by volume flow regulator, which are located on the segments.
  • the invention also relates to a method for controlled secondary cooling with a network of a continuous casting system through which a cooling medium flows.
  • the method according to the invention is characterized in that the pressure of the cooling medium is regulated.
  • valves are operated either as on / off valves, as discrete or continuously switchable valves. Likewise, it is advantageously closed by the regulation of the pressure of the cooling medium on the volume flow.
  • the pressure specifications of each automatic pressure control element are switched to the same.
  • the respectively measured volume flow in the pressure control circuit serve as an actual value, the desired volume flow as a reference variable and the pressure specifications of each automatic pressure control element as a manipulated variable.
  • a measured volume flow of the cooling medium is used as the actual value and compared with a reference variable, that for controlling the pressure of the cooling medium from the result for controlling the amount of a hydraulic or pneumatic command value is obtained, the self-regulating control or switching valves is supplied.
  • Fig. 1 is a sectional view through a segment of a strand guide in a continuous casting
  • FIG. 2 shows an embodiment for supplying a segment shown in plan view with a cooling medium, wherein in addition to a water chuck a control air chuck as a detachable E Lement is attached to the segment for the supply of compressed air as a reference variable to the adjusting members on the water chuck plate.
  • 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 and each equipped with rolls 1 a for guiding the strand.
  • Each segment 1 has two or more spray zones, which are usually operated depending on the width of the strand to be cast.
  • the cooling medium is applied by means of spray nozzles 4 from the top and nozzles 4a from the bottom.
  • the nozzles 4, 4a are each mounted in the areas between the rollers 1 a. According to the thickness of the metal strand to be transported, the nozzles 4 are adjustable in height.
  • a segment 31 is shown which is supplied with a cooling medium via three control circuits 32, 33, 34, that is, for example, with water or a water / compressed air mixture.
  • the control circuit 32 applies the cooling medium via a central feed line 35 to the central region of the segment 31. From the supply line, the cooling medium is distributed to the individual spray nozzles 4.
  • the control circuits 33 and 34 each have two parallel feed lines 39, 40 and 41 and 44, from which the cooling medium reaches the associated spray nozzles 4.
  • the cooling medium in the present case water, is supplied via a water tension plate 45 to the control circuits 32 to 34 via switching or control valves 46, 47 and 48, respectively.
  • the switching or control valves 46 to 48 are each equipped with adjusting members 49 to 51, via the pneumatically the switching or control position of the switching or control valves 46 to 48 is set by the adjustment or position of the adjusting members 49 to 51 through the pressure of the compressed air used as a reference variable is adjusted.
  • the compressed air is supplied to the adjusting members 49 to 51 via a clutch formed as a control air plate 52.
  • the quantity and pressure of the compressed air are provided by a control device, for example a programmable logic controller (PLC) 53.
  • PLC programmable logic controller
  • Via controllable pneumatic valves 54, 55 and 56, the pressure is set as a reference variable for the adjusting members 49 to 51 and these are supplied via their own lines 57, 58, 59 via the control air plate 52.
  • the water supply is ensured by a media room 60, are provided in the measuring points 61, 62 for the flow rate of the water or for its pressure. From there, the water is forwarded to the water clamping plate 45 serving as the coupling on the segment 31 and to the switching or control valves 46 to 48.

Landscapes

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

Abstract

L'invention concerne un dispositif permettant le refroidissement secondaire régulé avec un réseau, parcouru par un fluide de refroidissement, d'une installation de coulée continue. Ledit dispositif comporte des segments (31) pour le guidage d'une barre de coulée en métal, en particulier d'une barre de coulée en acier, et peut être adapté aux différentes tâches de coulée, en particulier en fonction des qualités d'acier, et en particulier aux tâches générées pendant le processus de coulée. Le dispositif selon l'invention est caractérisé en ce que ledit au moins un réseau de pression comprend au moins un organe de régulation automatique de la pression.
EP11760498.3A 2010-11-23 2011-09-26 Dispositif et procédé permettant le refroidissement secondaire régulé d'une installation de coulée continue Active EP2643109B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010052247A DE102010052247A1 (de) 2010-11-23 2010-11-23 Vorrichtung und Verfahren zur geregelten Sekundärkühlung einer Stranggießanlage
PCT/EP2011/066647 WO2012069234A1 (fr) 2010-11-23 2011-09-26 Dispositif et procédé permettant le refroidissement secondaire régulé d'une installation de coulée continue

Publications (3)

Publication Number Publication Date
EP2643109A1 true EP2643109A1 (fr) 2013-10-02
EP2643109B1 EP2643109B1 (fr) 2015-03-04
EP2643109B2 EP2643109B2 (fr) 2018-03-28

Family

ID=44674810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11760498.3A Active EP2643109B2 (fr) 2010-11-23 2011-09-26 Dispositif et procédé permettant le refroidissement secondaire régulé d'une installation de coulée continue

Country Status (4)

Country Link
EP (1) EP2643109B2 (fr)
CN (1) CN103459065B (fr)
DE (1) DE102010052247A1 (fr)
WO (1) WO2012069234A1 (fr)

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* 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
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
DE102017201128A1 (de) 2017-01-25 2018-07-26 Sms Group Gmbh Kühlsystem, hüttentechnische Anlage und Verfahren zum Betreiben eines Kühlsystems
CN107737896A (zh) * 2017-11-15 2018-02-27 中冶赛迪工程技术股份有限公司 一种连铸机二次冷却方法及装置
CN110788290B (zh) * 2019-11-22 2024-07-30 中冶赛迪技术研究中心有限公司 一种防止连铸二冷喷嘴堵塞的系统及方法
DE102020211720A1 (de) * 2020-09-18 2022-03-24 Sms Group Gmbh Verfahren und Sprüheinrichtung zur thermischen Oberflächenbehandlung eines metallischen Produkts
CN115026256A (zh) * 2022-07-11 2022-09-09 中冶赛迪工程技术股份有限公司 一种连铸二次冷却喷淋状态的识别方法及系统
DE102022210993A1 (de) * 2022-10-18 2024-04-18 Sms Group Gmbh Stützende Strangführung für eine Stranggießanlage, und Verfahren zum Kühlen eines Gießstranges

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JPH0740018A (ja) † 1993-08-04 1995-02-10 Kawasaki Steel Corp 連鋳２次冷却用スプレーノズルの閉塞防止方法
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DE102004001037A1 (de) 2004-01-03 2005-07-28 Sms Demag Ag Diversifizierte Regelung der Sekundärkühlung einer Stranggießanlage
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Also Published As

Publication number Publication date
DE102010052247A1 (de) 2012-05-24
CN103459065A (zh) 2013-12-18
EP2643109B2 (fr) 2018-03-28
EP2643109B1 (fr) 2015-03-04
WO2012069234A1 (fr) 2012-05-31
CN103459065B (zh) 2016-03-30

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