EP2334452A1 - Dispositif et procédé de refroidissement secondaire dans une installation de coulée continue - Google Patents

Dispositif et procédé de refroidissement secondaire dans une installation de coulée continue

Info

Publication number
EP2334452A1
EP2334452A1 EP09736122A EP09736122A EP2334452A1 EP 2334452 A1 EP2334452 A1 EP 2334452A1 EP 09736122 A EP09736122 A EP 09736122A EP 09736122 A EP09736122 A EP 09736122A EP 2334452 A1 EP2334452 A1 EP 2334452A1
Authority
EP
European Patent Office
Prior art keywords
strand
nozzles
casting
cooling device
displacement
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
EP09736122A
Other languages
German (de)
English (en)
Other versions
EP2334452B1 (fr
Inventor
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 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 EP2334452A1 publication Critical patent/EP2334452A1/fr
Application granted granted Critical
Publication of EP2334452B1 publication Critical patent/EP2334452B1/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

Definitions

  • the invention relates to a device and a method for secondary cooling in a continuous casting plant and a continuous casting plant with such a device.
  • a device and a method for secondary cooling in a continuous casting plant and a continuous casting plant with such a device In this case, between adjacent casting in the casting rollers, which lead a strand, arranged nozzles that apply coolant to the strand.
  • the subsequent cooling and solidification takes place in the so-called secondary cooling zone, which is usually located between the roller guide or the strand guide.
  • DE 24 01 263 shows a cooling system for a secondary cooling section of a continuous casting plant, in which spray water nozzles are arranged in the casting direction between the rollers.
  • the area of the strand which the nozzles cover for cooling can be enlarged or reduced by means of various apertures.
  • This system is intended to cool the slab edges less than the slab center.
  • a disadvantage of this system that the nozzles are fixedly arranged with respect to the direction parallel to the longitudinal axis of the rollers. As a result, the system can no longer ensure adequate cooling when an asymmetric slab pattern occurs in the strand guide.
  • the system does not allow cooling of different strands in multi-strand operation. The effectiveness of the cooling and the cooling result deteriorate greatly as the width of the strands varies. If a narrow strand is to be cooled, then a large part of the cooling water must be "hidden" whereby it is lost for cooling and has to be returned or removed.
  • DE 30 39 443 discloses a system for secondary cooling in a continuous casting plant, which has two opposing, fixedly mounted adjusting lever, which are connected by a push rod in the manner of an anti-parallel crank with opposite motion transmission, wherein the hinged to the adjusting levers are guided together parallel to the strand surface , This construction is also mounted between two rollers adjacent to the casting direction.
  • a disadvantage of this cooling device is its complicated and complicated construction. Moreover, this device does not allow due to their structural conditions to compensate for an asymmetric strand profile. The strand edge overspray can not be avoided and central portions of the strand may not be adequately cooled.
  • DE 25 07 971 shows a further, mechanically very complicated construction for secondary cooling between two rollers adjacent in the casting direction, in which a metal linkage, which can be folded and unfolded, carries spray water nozzles.
  • This invention has similar disadvantages as DE 30 39 443.
  • the technical task that results is to ensure an adequate cooling of one or more strands at all times. In particular, this should also be possible with asymmetric strand progressions and also in very limited space.
  • the above-mentioned technical problem is solved by the invention disclosed below and comprises a cooling device for secondary cooling of a strand in a continuous casting plant, the cooling device comprising: at least two nozzles for spraying a coolant onto the surface of the strand between two adjacent in the casting direction Rolls of the continuous casting, in particular the strand guide and a displacement and positioning means for moving and positioning the at least two nozzles independently of one another parallel to the longitudinal axis of the rollers in dependence on at least one G demparameter, wherein the vertical distance of the nozzles from the surface of the strand remains constant ,
  • the system requires very little space in this direction. Furthermore, it is achieved by the independent adjustment of the nozzles that strands can be optimally cooled, ie, for example, that even with an asymmetric slab profile, the nozzles can be adjusted so that they cool only a desired central region of the strand. For each strand run a strand edge over-injection can be avoided.
  • the system can be used for multi-strand operation without any modification and thus efficiently cool individual adjacent strands.
  • the spray can by adjustment The nozzles are concentrated on the strand centers, whereby an intensive cooling of the strand center is made possible.
  • the casting parameters are the casting speed, the steel quality of the strand, the current format width of the strand, the respective current strand profile, the number of simultaneously parallel cast strands, the current position of the edge regions of the strand and / or the respective current solidification situation of the core of the strand.
  • the cooling device comprises first sensors for detecting the respective current position of the individual nozzles and second sensors for detecting the casting parameters, preferably in each case in real time.
  • first sensors for detecting the respective current position of the individual nozzles
  • second sensors for detecting the casting parameters, preferably in each case in real time.
  • the second sensors are displacement or position sensors for the current detection of the position of the strand and the edge regions of the strand.
  • the displacement and positioning device is designed in the form of at least one linear guide with an adjusting drive for displacing the nozzles along the guide.
  • the displacement and positioning device is designed in the form of two linear guides with at least one associated adjusting drive, wherein the guides between the two adjacent rollers parallel to the rollers, but offset from each other in the casting direction and at each of two guides at least one of the nozzles is slidably mounted.
  • the at least one adjustment drive is electrically, pneumatically or hydraulically designed.
  • the cooling device comprises a control or regulation device for automatically displacing and positioning the nozzles by means of the displacement and positioning device as an actuator in response to the casting parameters and optional - additionally in response to further parameters, e.g. the spray angle or spray pattern of the nozzles.
  • the nozzles are designed for single-material cooling or multi-material cooling.
  • cooling device in addition to the displaceable by means of the displacement and positioning means nozzles and stationary nozzles between the two rollers adjacent in the casting direction are arranged.
  • the invention also encompasses a method for secondary cooling of at least one strand in a continuous casting installation, in which at least two nozzles for spraying a coolant onto the surface of the strand are adjustably arranged between two rollers adjacent to the casting direction, wherein the at least two nozzles are independent can be shifted and positioned parallel to the longitudinal axis of the rollers in dependence on at least one casting parameter, the vertical distance of the nozzles from the surface of the strand remaining constant.
  • the casting parameters are the casting speed, the steel quality of the strand, the width of the strand, the respective current strand profile, the number of simultaneously parallel cast strands, the position of the edge regions of the strand and / or the respective current solidification situation of the core of the strand.
  • the pouring parameters are in each case currently measured as actual values and / or predetermined as desired values, wherein the displacement and positioning of the nozzles takes place manually or as part of an automatic control or regulation taking into account the pouring parameters.
  • the at least two nozzles can be displaced offset to one another between the two adjacent rollers in the casting direction.
  • the two nozzles arranged offset in the casting direction are positioned in the longitudinal direction of the rollers in such a way that their spray patterns overlap - as seen in the casting direction - only in the region of the still liquid core of the strand, but not at its edge regions ,
  • the spray patterns of the nozzles do not cover the edge regions of the slabs.
  • the positions of the nozzles are readjusted such that the spray profiles of the nozzles cover the same areas of the surface of the strand as those before the displacement.
  • the nozzles are controlled individually or in groups individually and the pressure and the Amount of the coolant flowing out of the nozzles are set individually for at least individual subregions of the strand surface.
  • the coolant is sprayed onto only one surface or several surfaces, in particular the two opposite broad sides, of the slab.
  • the contour of the spray profile of the coolant is formed when striking the strand surface oval, rectangular or in the form of a dog bone firmly or variably adjustable.
  • the invention also comprises a continuous casting machine for producing a strand, with a mold for casting the strand and with rolls adjacent in the casting direction for guiding the strand and a cooling device for secondary cooling of a strand, the cooling device being constructed as described above is arranged.
  • the rolls adjacent to the casting direction represent the strand guide of the continuous casting plant, wherein the cooling device is arranged in the strand guide.
  • the rolls adjacent in the casting direction represent a straightening device of the continuous casting plant, wherein the cooling device is arranged in the straightening device.
  • FIG. 1 a shows a cross-section of a strand in a strand guide which is cooled by two spray water nozzles, which are adjusted independently of one another by a displacement and positioning device in such a way that strand edge overspray is avoided;
  • FIG. 1 b shows the arrangement of FIG. 1 a in a plan view, the spray patterns of the two nozzles cooling the strand surface, but without applying water to the strand edges;
  • FIG. 2a shows a cross section of a strand in a strand guide, which is a-symmetrically or decentrally guided in the strand guide and is cooled by two spray water nozzles, which are adjusted independently by a displacement and positioning device so that the strand despite the asymmetric
  • Figure 2b shows the arrangement of Figure 2a in a plan view, wherein the spray patterns of the two nozzles effectively cool the strand despite the asymmetrical course;
  • 3a shows a cross section of a strand in a strand guide, which is cooled by two spray water nozzles, which are adjusted independently by a displacement and positioning device so that an intensive cooling of the strand center is carried out;
  • 3b shows the arrangement of Figure 3a in a plan view, wherein the
  • Strangmitte is intensively cooled by the spray patterns of the two nozzles;
  • 4a shows a cross-section of an arrangement in which two strands are moved in multi-strand operation by a strand guide, wherein two nozzles are set independently for cooling by a displacement and positioning device so that a targeted cooling of both strands takes place;
  • Figure 4b shows the arrangement of Figure 4a in a plan view, wherein the spray patterns of the two nozzles are each centered on one of the strands are directed;
  • Figure 5 is a schematic of a control of the nozzle positions.
  • Figure 1a is a strand 1 between rollers 2 a strand guide.
  • the nozzles 3 in FIG. 1 a are each moved linearly by a displacement and positioning device 4. This direction of movement or movement axis is characterized by the double arrows in the figure.
  • the nozzles 3 spray water on the strand 1. In this case, not the complete width of the strand 1 is sprayed, but only the area A of the strand 1.
  • the nozzles 3 have spray angles of the sizes ⁇ and ß.
  • the dashed nozzles 3, including their dashed spray areas with the angles ⁇ and ß, show a position in which the entire width of the strand 1 would be provided with water spray.
  • the displacement and positioning device 4 may be formed in particular in the form of at least one linear guide, are moved to the nozzle 3 by means of an adjustment.
  • Figure 1 b shows the same arrangement as Figure 1 a, but in a plan view. Shown in the figure is that the spray patterns or the spray areas B of the two nozzles 3 do not overlap.
  • the nozzles 3 are arranged between two rollers 2 adjacent in the casting direction and can generally also be arranged between a plurality of adjacent roller pairs of a strand guide.
  • the nozzles 3 can be moved independently of one another and are arranged one behind the other in relation to the casting direction (see double arrow), ie can be moved with one another without collision.
  • FIGS. 1a and 1b the arrangement shown can solve the problem of strand edge over-molding by the nozzles 3 being able to be directed independently of one another to an area in the center of the strand by the displacement and positioning devices 4.
  • FIG. 2a In the cross section of the arrangement according to FIG. 2a, an asymmetrical course of a strand 1 in a roller guide is shown.
  • the center of the strand 1 is not in line with the center of the strand guide, which is represented by the line C.
  • the nozzles 3 are displaced to the left by the adjusting units 4, corresponding to the position of the strand 1, which is indicated by the arrows pointing to the left in the drawing.
  • the two nozzles 3 have spray angles ⁇ and ⁇ , wherein the nozzles 3 are adjusted in position so that they cool the entire strand 1.
  • FIG. 2b shows that the spray patterns B 'of both nozzles 3 do not overlap.
  • the strand can be cooled better in its center, as 3 more water is applied by the successive casting in the casting direction on the strand surface between the two nozzles than at the edge of the strand 1.
  • the nozzles 3, located in the gap are located between two adjacent casting in the casting direction, are adjusted by the displacement and positioning means 4 of the asymmetrical position of the strand 1.
  • FIG. 3a shows a strand 1, which is located in a strand guide 2, wherein the strand 1 in particular has a liquid core (characterized by an oval within the strand 1).
  • This non-solidified part is cooled by the correspondingly adjusted nozzles 3 with setting angles ⁇ and ß reinforced.
  • the outer regions of the strand 1 remain here without direct cooling through the nozzles.
  • FIG. 3b the situation of FIG. 3a is shown once again in a plan view, wherein the nozzles 3 moved between the rollers 2 are adjusted to the center of the strand 1, whereby the intensive cooling of the strand center is achieved. It can clearly be seen that the nozzles 3 can be moved independently on their guides by the adjusting units.
  • the spray patterns B "do not overlap, but the center of the strand 1 is cooled more than the outer regions, since the strand 1 passes under the nozzles 3, whereby the strand is cooled in its center by the successive spray images B" of the two nozzles becomes.
  • a nozzle 3 is preferably centered on one of the strands 1', 1" with the aid of a displacement and positioning device 4.
  • the nozzles have the spray angles ⁇ and ⁇ .
  • FIG 4b can be clearly seen in a top view, that the nozzles 3 are independently and collision-free on each one of the strands 1 '"are directed.
  • Each of the spray patterns B 1", 1 is on one of the strands 1' centered, 1 ", or .
  • the edges of the individual strands 1 ', 1 " are not sprayed in this case, for example, to avoid strand edge overspray.
  • sensors or position measurements are generally provided.
  • nozzles can be arranged, for example, either directly, ie internally in the adjusting mechanism (linear guide or linear drive or rod of a piston) of the nozzles, or be arranged on the adjusting mechanism, ie externally.
  • this can on the one hand be an integrated displacement sensor or, on the other hand, a displacement measuring system arranged parallel to the cylinder rod, which determines the position of the rod (or of the piston) and thus the position of the nozzle.
  • a displacement measuring system arranged parallel to the cylinder rod, which determines the position of the rod (or of the piston) and thus the position of the nozzle.
  • other suitable positioning of the sensors is also conceivable.
  • FIG. 5 schematically shows a control of the system. It is assumed that the controlled variable of the position of the nozzle 3.
  • the current actual nozzle position can be measured with first sensors.
  • other second sensors are used for the detection of the casting parameters, such as the casting speed, the steel quality, the current strand profile, the current position of the edges of the strand or the solidification situation of the strand and others.
  • the actual values obtained by the further or second sensors are compared with the target values for the casting parameters SQ, from which the setpoint values for the nozzle position SD are determined by means of a computer.
  • the determined difference between the setpoint and actual value of the nozzle position is passed to the control device, which outputs control values and, for example , takes into account further parameters P z , such as the spray angles of the nozzles 3 and others.
  • These control values are subsequently transferred to the actuator, that is to say the displacement and positioning device 4.
  • the actuator then acts on the control variable, that is, on the nozzle position, a, wherein the controlled system is essentially given by the strand guide or the directional range with the secondary cooling.
  • the measurement by the sensors and the control are preferably carried out in real time.
  • the scheme shown serves for the general clarification of the regulation, it can but be modified by the expert also for the specific application according to control technology.
  • the cooling can take place not only from the upper and / or the lower side (or the loose side and the fixed side) of a strand 1, but also from other or some or all sides of a strand Strangs 1.
  • the vertical, ie the vertical, spacing of the nozzles in the orientations of Figures 1a, 2a, 3a and 4a to the respective strand surface constant.
  • the strand can also be guided vertically.
  • the figures therefore do not represent a restriction for the orientation of the strand together with the roller arrangement.
  • the cooling can, for. B. in the strand guide of the strand and / or in the bending or straightening region of the strand.
  • the nozzles used can be nozzles for single-substance (eg water) or dual-substance cooling (eg water-air).
  • nozzles for single-material cooling which have only one media feed
  • nozzles for multi-material cooling have several media feeds. The mixture of different media takes place at the nozzle.
  • a nozzle for two-fluid cooling has a larger control ratio (smallest control value divided by the largest control value) than a nozzle for single-fluid cooling. As a result, the cooling can be adjusted even better to different steel grades or casting speeds and other casting parameters.
  • the spray water nozzles used are selected depending on the specific process parameters (such as casting speed, format width, steel quality, etc.).
  • the selected water pressure and / or the volume of water or optionally the air pressure in the case of a water-air cooling, is also selected according to the requirements of the process.
  • the adjusting units shown on the left in each case can position nozzles on the right-hand side of a strand and vice versa, since the nozzles can be moved completely independently of one another.
  • the system can also be combined with fixed nozzles.
  • a plurality of nozzles can also be moved in alignment or on a line independently of one another by means of different displacement and positioning devices, which are arranged on both sides of the strand, if this is the case, for example. B. for reasons of space, should be desired.
  • several nozzles can be adjusted by means of a displacement and positioning device.
  • the setting angles, or the spray angles or spray angles of the nozzles 3, ⁇ and ⁇ are preferably taken into account as constant parameters for determining the nozzle position in the plant automation. Of course, they can also have adjustable angles, which are known to the system for controlling the adjustment of the nozzles.
  • the contour of the spray water area (contour of the spray profile / spray pattern) of a nozzle instead of having an oval shape as in the figures, may have other shapes, for example rectangular spray water areas or rectangular spray water areas with widened formation of the end areas (eg in shape a dog bone).
  • the displacement and positioning devices used for the nozzle adjustment can be provided by means of an electric motor as linear drives or alternatively as hydraulic drives or as pneumatic drives.
  • the spray water quantities and / or the spray water pressures can be set independently for all subregions of the secondary cooling, if necessary even for each individual nozzle.
  • the device according to the invention is therefore suitable for secondary cooling in a wide variety of continuous casting plants, for example in slab, thin slab, block, billet and pre-profile continuous casting plants.

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

Abstract

L'invention concerne un dispositif et un procédé de refroidissement secondaire dans un guidage de barre ainsi qu'une installation de coulée continue réalisée de manière correspondante. Selon l'invention, on dispose entre deux rouleaux ou cylindres (2) voisins dans la direction de coulée, dans une ligne de rouleaux ou dans un guidage de barre, des buses (3) qui projettent un agent de refroidissement sur la surface de la barre 1, 1',1". En l'occurrence, selon l'invention, la distance verticale entre les buses (3) et la barre 1, 1', 1" reste constante, les buses (3) pouvant être déplacées indépendamment l'une de l'autre parallèlement à l'axe longitudinal des rouleaux (2) au moyen d'un dispositif de déplacement et de positionnement (4). On obtient ainsi un faible encombrement et une grande souplesse lors du refroidissement d'une barre 1, 1', 1". L'invention permet dès lors d'éviter un arrosage excessif des arêtes de la barre, de réaliser un refroidissement intense du milieu de la barre, de tenir compte d'un trajet asymétrique de la barre lors du refroidissement et ainsi de refroidir de manière optimale les barres dans une machine de coulée à plusieurs lignes.
EP09736122A 2008-10-01 2009-09-21 Dispositif et procédé de refroidissement secondaire dans une installation de coulée continue Active EP2334452B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008049834 2008-10-01
DE102009010251A DE102009010251A1 (de) 2008-10-01 2009-02-24 Vorrichtung und Verfahren zur Sekundärkühlung in einer Stranggießanlage
PCT/EP2009/006787 WO2010037480A1 (fr) 2008-10-01 2009-09-21 Dispositif et procédé de refroidissement secondaire dans une installation de coulée continue

Publications (2)

Publication Number Publication Date
EP2334452A1 true EP2334452A1 (fr) 2011-06-22
EP2334452B1 EP2334452B1 (fr) 2012-08-01

Family

ID=41795189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09736122A Active EP2334452B1 (fr) 2008-10-01 2009-09-21 Dispositif et procédé de refroidissement secondaire dans une installation de coulée continue

Country Status (4)

Country Link
EP (1) EP2334452B1 (fr)
CN (1) CN102170983B (fr)
DE (1) DE102009010251A1 (fr)
WO (1) WO2010037480A1 (fr)

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EP2412459A1 (fr) 2010-07-29 2012-02-01 Siemens VAI Metals Technologies GmbH Dispositif de réglage de buses de pulvérisation
EP2673099B1 (fr) * 2011-02-07 2017-12-06 Primetals Technologies Austria GmbH Procédé de régulation d'une température d'une barre de coulée par positionnement d'une buse de refroidissement déplaçable dans un dispositif de guidage de barres de coulée d'une installation de coulée continue
CN102430733B (zh) * 2011-12-21 2013-07-03 天津钢铁集团有限公司 一种板坯连铸机二冷水幅切控制方法
KR101460660B1 (ko) * 2012-04-20 2014-11-13 주식회사 포스코 냉각장치 및 이를 구비하는 연속주조기용 세그먼트
CN103934425A (zh) * 2014-04-18 2014-07-23 中国重型机械研究院股份公司 一种液压动态二冷水幅切控制系统
CN105382246B (zh) * 2015-12-08 2017-07-14 江苏捷帝机器人股份有限公司 一种高精度冷却系统
CN105478705B (zh) * 2016-01-20 2018-06-22 中冶赛迪工程技术股份有限公司 一种板坯二次冷却无级调节装置
CN105458206B (zh) * 2016-01-21 2017-10-17 中冶赛迪工程技术股份有限公司 一种板坯二次冷却方法
DE102016215977A1 (de) * 2016-02-24 2017-08-24 Sms Group Gmbh Düsenreihenanordnung und Düsenfeld zum Einbau in Rollenspalte zwischen zwei Strangführungsrollen
RU2748255C2 (ru) 2016-10-18 2021-05-21 ЭКОЛАБ ЮЭсЭй ИНК. Устройство для отделения воды и твердых частиц распыляемой воды в машине непрерывного литья и способ непрерывного контроля и управления коррозионным фоном
AT520006B1 (de) * 2017-06-07 2021-08-15 Primetals Technologies Austria GmbH Kühlmitteldüse zum kühlen eines metallischen strangs in einer stranggussanlage
DE102018205685A1 (de) * 2018-04-13 2019-10-17 Sms Group Gmbh Kühleinrichtung und Verfahren zu deren Betrieb
CN115555531B (zh) * 2022-12-02 2023-03-07 北京科技大学 一种方坯连铸二冷区气体冷却装置及工艺

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Also Published As

Publication number Publication date
WO2010037480A1 (fr) 2010-04-08
CN102170983A (zh) 2011-08-31
CN102170983B (zh) 2017-05-24
DE102009010251A1 (de) 2010-04-08
EP2334452B1 (fr) 2012-08-01

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