EP2718043A1 - Verfahren zum regeln der höhe des giessspiegels in einer kokille einer stranggiessanlage - Google Patents
Verfahren zum regeln der höhe des giessspiegels in einer kokille einer stranggiessanlageInfo
- Publication number
- EP2718043A1 EP2718043A1 EP12718198.0A EP12718198A EP2718043A1 EP 2718043 A1 EP2718043 A1 EP 2718043A1 EP 12718198 A EP12718198 A EP 12718198A EP 2718043 A1 EP2718043 A1 EP 2718043A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- height
- liquid metal
- volume flow
- controller
- 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
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
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
-
- 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
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
Definitions
- the invention relates to a method for regulating the height of the casting mirror in a mold of a continuous casting plant.
- liquid metal is usually passed from a ladle via a shadow tube into an intermediate container (tundish). From the intermediate container then passes the liquid metal through a pouring tube into the mold. At the lower end of the mold, the cast strand is then discharged and deflected by means of a strand guide from the vertical to the horizontal.
- the discharge from the intermediate container into the pouring tube may comprise a stopper which is arranged in a valve seat and by raising or lowering of which the volume flow of the liquid metal can be influenced.
- the plug position is influenced by a moving element, which is controlled by a controller to obtain a defined volume flow.
- the unknown transfer function of the plug is a disturbance variable; that is, it is not known per se how the volume flow of liquid metal changes when the plug is raised or lowered a defined amount.
- the problem arises from the fact that it is unknown how the transfer function changes if, due to clogging or erosion, a Change takes place at the seat of the plug in the outflow opening. Clogging describes the caking of material in the pouring tube or on the stopper; As a result, the plug must be raised further in order to achieve the same volume flow of metal.
- aggressive processes carry material from the stopper, so that in some steel grades, the stopper must be constantly fed further in order to obtain the same volume flow of metal.
- a method is to be proposed with which the level of the casting mirror can be kept as stable and as constant as possible at a predetermined value or in a predetermined range, even with the aforementioned influencing variable.
- stopper the volume flow of liquid metal flowing from the ladle or the intermediate container into the mold is measured by a flow sensor as the actual volume flow, the volume flow being determined according to a nominal value and taking into account the measured actual value.
- Volume control in a first control loop is controlled by a first controller, wherein the first controller acts on the control, wherein the height of the mold level in the mold after specification of a desired value or desired range and taking into account the actual height of the mold level in a second control loop with a second controller is controlled, wherein the second controller to the first control circuit sets a target value for the flow, wherein the determination of the actual height of the casting mirror takes into account a standing wave on the casting mirror, which is due to the inflow of liquid metal in the mold the G confusesp iegel is formed by a temperature profile over the height of the mold at a number of peripheral locations of the mold is detected and the measured temperature profiles are used in determining the effective height of the mold level.
- the determination of a temperature profile over the height of the mold by means of at least one optical waveguide, which is arranged vertically in the mold wall.
- the temperature profile over the height of the mold can be detected for each optical waveguide and the maximum of the measured values can be used as a criterion for the position of the actual height of the mold level at the relevant peripheral point of the mold.
- a movable closure plug is used.
- a sensor is advantageously used, which determines the volume flow by induction of a magnetic field in the liquid metal.
- At least four optical waveguides, more preferably even at least eight or more optical waveguides, are preferably arranged around the circumference of the mold, each of which detects a temperature profile above the height of the mold.
- Each optical waveguide can detect at least 5, preferably at least 20, measured temperature values over the height extent of the mold. The detection of up to 40 temperature values is possible.
- a range is preferably set, which is located at a defined distance from the upper edge of the mold. In this case, it is particularly preferably provided that a distance from the upper edge of the mold between 90 and 1 10 mm is specified for the desired range.
- the second controller no deviation is preferably reported to the second controller, as long as a value is determined for the actual height of the liquid metal which lies within the predetermined range.
- the first controller and the second controller are preferably designed so that the adjustment of the volume flow is faster than the adjustment of the height of the liquid metal in the mold.
- the invention proposes that the integrative fraction of the fill level in the mold takes place by detecting the temperature distribution in the mold by means of optical waveguides and inference to the actual G manador altar way, but then fast dynamic changes by flow measurement (volume flow measurement) are controlled at the pouring tube.
- the regulation of the liquid steel mirror in the mold ie the regulation of the integrative component, is carried out - as mentioned - so that the G stealadorwait moves in a defined range.
- a distributed measurement of the temperature profile over the mold height with the mentioned fiber optic methods is provided for this purpose.
- the Optical Time Domain Reflectometry method or the Optical Frequency Domain Reflectometry method is used.
- the mold is in this case provided over the circumference with a plurality of optical waveguides which extend vertically in the mold wall and have up to 40 measuring points.
- a "heat lobe" is measured with each optical waveguide, ie a temperature profile above the mold height.
- the pouring mirror is mainly described by the position of the maximum of the heat lobe.
- the distributed measurement of up to 32 heat lobes distributed over the circumference of the chill mold creates a "mountain range" along the outer boundary of the chill mold so that the shape and size of a so-called “standing wave” in the chill mold can be determined.
- This control over the distributed measurement in the mold thus serves to adjust the integrative content in the mold. It should be prevented the runaway of the casting mirror from a target area.
- a target range of, for example, 90 to 110 mm is determined for controlling the integrative fraction in the mold In this range and has no strong fluctuations, there are no control interventions with respect to the integrative level.
- the number of optical fibers can be selected expertly. In principle, it is also possible to work with only a single optical waveguide, of course with a loss of accuracy.
- the optical waveguide would be preferred in this case z.
- the optical waveguide is preferably laid in a cladding tube.
- the cladding tube has, for example, an outer diameter of 0.5 to 2 mm and an inner diameter of 0.4 to 1, 8 mm and is made of stainless steel.
- the introduction into the mold is carried out by insertion into a bore made for this purpose or by incorporation in a layer of copper or nickel.
- the temperature rise times for the optical waveguide in the cladding tube are very short (after a time well below one second, a considerable part of the final temperature value is reached). A resolution of up to 1 ° C is possible. Accordingly, the overall result is an effective control of the rapidly changing portion by a very rapid flow measurement at the pouring tube and a control based on the control of the volume flow of liquid metal, which is conveyed into the mold.
- the further control of the integrative component in the mold is, however, by observing a confidence interval (target range) for the level of the pouring mold in the mold, for which the distributed optical fiber measurement is used, with which a fatiguengebirgszug the so-called. Standing wave is detected. Effects such as bulging can hereby be recorded and corrected.
- the technology of measuring temperatures by optical waveguides is known as such, to which reference is made to WO 2004/015349 A2 and to WO 2007/079894 A1.
- Fig. 1 shows schematically a continuous casting, wherein in addition to a ladle, an intermediate container and a mold and a control scheme is outlined
- Fig. 2 shows the section A-B of FIG. 1 by the mold and
- Fig. 3 shows schematically the course of a measured temperature above the height of the mold.
- a part of a continuous casting plant 3 is outlined, which has a ladle 5 for receiving molten steel 4 in a known manner.
- the liquid metal 4 passes into an intermediate container 6. From this in turn, the liquid metal 4 is passed through a pouring tube 7 in the mold 2.
- the liquid metal 4 forms a pouring mirror. 1
- the height h of the pouring mirror 1 should remain as constant as possible during continuous casting and, in any case, be in a range which is away from the upper edge of the mold 2 by a defined distance x. Specifically, it has proven useful if the casting mirror 1 remains at a distance x of 90 to 1 10 mm from the upper edge of the mold 2.
- the volume flow V of liquid metal 4, which is supplied to the mold 2 can be influenced by a control element 8, which - formed as a plug - can be moved via an actuating element in the direction of the double arrow in FIG. Accordingly, more or less volume of liquid metal 4 can be passed into the mold 2 per time.
- a first control loop which consists of a first regulator 10 and the first controlled system 14 influenced by it (see the schematic representation in FIG. Given the first control loop is a setpoint for the flow rate V So u. The actual
- Volume flow VM is detected by a flow sensor 9, which is arranged in or on the pouring tube 7.
- a sensor is included that includes a magnet whose force is detected by a weighing device. This force is influenced by the flow of the liquid metal so that the volume flow can be measured.
- the deviation V So u - V is given to the first controller 10, which then actuates the control element 8 accordingly.
- superimposed in cascade on the first control loop is a second control loop which has a second regulator 11 and a second control path 15.
- the manipulated variable is the nominal height of the casting mirror h S0 ii, which - as explained - should be at a predetermined value or in a predetermined range.
- the desired height or the desired height range is specified for the control.
- the second controller 1 1 is the second controlled system 15 before the control signal, in which case the first control loop is interposed (cascade control).
- St is subtracted from the desired height h S0 ii, so that at a given control difference, the second controller 1 1 causes the necessary.
- the determination of the actual height of the pouring mirror in 1 of the mold 2 is correspondingly important. Due to the inflow of liquid metal 4 into the mold 2, a so-called standing wave forms here, which is indicated in FIG. 1 in the mold. Also sketched are some flow arrows in the melt. The flow is responsible for the fact that it comes to said standing wave.
- each optical fiber 12 is located in a vertical bore which is introduced in the mold wall. About the circumference up to 32 optical fibers 12 are placed.
- Each optical waveguide 12 can detect the temperature profile over the height h of the mold 2, for example, via the fiber Bragg grating method explained in more detail below.
- the optical waveguide 12 typically has a diameter of z. B. 0.12 mm; with cladding usually results in a diameter in the range of 0.5 mm to 2.0 mm.
- the optical waveguide 12 can withstand temperatures up to 800 ° C continuous load.
- the optical waveguides 12 are connected to a temperature detection system, not shown. By means of the detection system laser light is generated, which is fed into the optical waveguide 12. The data collected by the optical fiber 12 are converted into temperatures by means of the detection system and assigned to the various measurement locations.
- the evaluation can be carried out, for example, according to the so-called fiber Bragg grating method (FBG method).
- FBG method fiber Bragg grating method
- suitable optical waveguides are used, the measuring points with a periodic variation of the refractive index or grating get impressed with such variations.
- This periodic variation of the refractive index leads to the fact that the optical waveguide represents a dielectric mirror as a function of the periodicity for specific wavelengths at the measuring points.
- the Bragg wavelength is changed and exactly this is reflected.
- Light that does not meet the Bragg condition is not significantly affected by the Bragg grating.
- the different signals of the different measuring points can then be distinguished from one another on the basis of propagation time differences.
- the accuracy of the spatial resolution is given by the number of impressed measuring points.
- the size of a measuring point can be, for example, in the range of 1 mm to 5 mm.
- the "Optical Frequency Domain Reflectometry” method (OFDR method) or the “Optical Time Domain Reflectometry” method (OTDR method) can be used to measure the temperature.
- These methods are based on the principle of fiber optic Raman backscatter, taking advantage of the fact that a temperature change at the point of a light guide causes a change in the Raman backscatter of the optical waveguide material.
- the evaluation unit eg a Raman reflectometer
- the temperature values along a fiber can then be determined in a spatially resolved manner, with this method averaging over a specific length of the conductor. This length is about a few centimeters.
- the different measuring points are in turn separated by differences in transit time.
- the construction of such systems for evaluation according to the said methods is well known, as are the necessary lasers which generate the laser light within the optical waveguide.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011105332 | 2011-06-07 | ||
| DE102011078141 | 2011-06-27 | ||
| DE102011078485 | 2011-06-30 | ||
| DE201110085932 DE102011085932A1 (de) | 2011-06-07 | 2011-11-08 | Verfahren zum Regeln der Höhe des Gießspiegels in einer Kokille einer Stranggießanlage |
| PCT/EP2012/057972 WO2012168005A1 (de) | 2011-06-07 | 2012-05-02 | Verfahren zum regeln der höhe des giessspiegels in einer kokille einer stranggiessanlage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2718043A1 true EP2718043A1 (de) | 2014-04-16 |
| EP2718043B1 EP2718043B1 (de) | 2015-09-16 |
Family
ID=47220469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12718198.0A Not-in-force EP2718043B1 (de) | 2011-06-07 | 2012-05-02 | Verfahren zum regeln der höhe des giessspiegels in einer kokille einer stranggiessanlage |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2718043B1 (de) |
| CN (1) | CN103702784B (de) |
| DE (1) | DE102011085932A1 (de) |
| WO (1) | WO2012168005A1 (de) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013214811A1 (de) | 2013-01-30 | 2014-07-31 | Sms Siemag Aktiengesellschaft | Verfahren und Vorrichtung zum Gießen eines Strangs |
| AT515244A2 (de) | 2013-12-30 | 2015-07-15 | Inteco Special Melting Technologies Gmbh | Verfahren zur Herstellung von langen Gussblöcken großen Querschnitts |
| EP3379217A1 (de) | 2017-03-21 | 2018-09-26 | ABB Schweiz AG | Verfahren und vorrichtung zur bestimmung einer temperaturverteilung in einer formplatte für ein metallherstellungsverfahren |
| EP3424614A1 (de) * | 2017-07-03 | 2019-01-09 | Primetals Technologies Austria GmbH | Einbau eines faseroptischen temperatursensors in eine kokille und kokille mit mehreren faseroptischen temperatursensoren |
| BE1026740B1 (fr) * | 2019-06-21 | 2020-05-28 | Ebds Eng Sprl | Procédé pour équilibrer un écoulement d'acier liquide dans une lingotière et système de coulée continue d'acier liquide |
| CN112935213B (zh) * | 2019-12-11 | 2022-10-28 | 中冶京诚工程技术有限公司 | 结晶器内钢水液面高度测量方法及相关装置 |
| CN111822665B (zh) * | 2020-07-25 | 2021-12-21 | 莱芜钢铁集团银山型钢有限公司 | 一种用于连铸中间包透气上水口座砖的吹氩控制方法及氩气控制装置 |
| WO2024017831A1 (de) * | 2022-07-18 | 2024-01-25 | Primetals Technologies Austria GmbH | VIRTUELLER FÜLLSTANDSSENSOR FÜR EINE KOKILLE EINER STRANGGIEßANLAGE |
| CN120831158B (zh) * | 2025-09-19 | 2025-11-18 | 东北大学 | 结晶器的液面检测系统及液面检测方法和存储介质 |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH430066A (de) * | 1965-12-30 | 1967-02-15 | Concast Ag | Verfahren und Vorrichtung zur Steuerung einer Stranggiessanlage |
| JPS60144B2 (ja) * | 1979-12-27 | 1985-01-05 | 株式会社東芝 | 鋳湯液面制御装置 |
| FR2703277B1 (fr) * | 1993-03-30 | 1995-05-24 | Lorraine Laminage | Procédé et dispositif de régulation du niveau de métal liquide dans une lingotière de coulée continue des métaux. |
| JPH10216914A (ja) * | 1997-02-05 | 1998-08-18 | Sumitomo Metal Ind Ltd | 連続鋳造における湯面レベル制御方法 |
| AU2429300A (en) * | 1998-12-23 | 2000-07-31 | Sms Demag Aktiengesellschaft | Method for detecting and controlling the level of liquid metal in an ingot mold |
| SE520648C2 (sv) | 1999-03-25 | 2003-08-05 | Mpc Metal Process Control Ab | Förfarande och anordning för att mäta en parameter hos en metallbana |
| CN1120323C (zh) * | 1999-03-26 | 2003-09-03 | 梁畡锺 | 具有表和扬声器的节能型室内吸顶灯 |
| JP3494135B2 (ja) * | 2000-08-09 | 2004-02-03 | 住友金属工業株式会社 | 連続鋳造機の湯面レベル制御方法及び湯面レベル制御装置 |
| AU2003266262A1 (en) | 2002-08-06 | 2004-02-25 | Lios Technology Gmbh | Furnace, method and monitoring system for monitoring its condition |
| DE102005061675B3 (de) | 2005-12-21 | 2007-07-26 | Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH | Konverter mit einem Behälter zur Aufnahme geschmolzenen Metalls und einer Messvorrichtung zur optischen Temperaturbestimmung des geschmolzenen Metalls |
| DE102008029742A1 (de) * | 2008-06-25 | 2009-12-31 | Sms Siemag Aktiengesellschaft | Kokille zum Gießen von Metall |
| DE102008060032A1 (de) | 2008-07-31 | 2010-02-04 | Sms Siemag Aktiengesellschaft | Gießspiegelmessung in einer Kokille durch ein faseroptisches Messverfahren |
| WO2010066447A1 (de) | 2008-12-11 | 2010-06-17 | Sms Siemag Ag | Vorrichtung zur detektion des durchflusses und verfahren hierfür |
-
2011
- 2011-11-08 DE DE201110085932 patent/DE102011085932A1/de not_active Withdrawn
-
2012
- 2012-05-02 WO PCT/EP2012/057972 patent/WO2012168005A1/de not_active Ceased
- 2012-05-02 CN CN201280038622.2A patent/CN103702784B/zh not_active Expired - Fee Related
- 2012-05-02 EP EP12718198.0A patent/EP2718043B1/de not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012168005A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102011085932A1 (de) | 2012-12-13 |
| EP2718043B1 (de) | 2015-09-16 |
| CN103702784A (zh) | 2014-04-02 |
| WO2012168005A1 (de) | 2012-12-13 |
| CN103702784B (zh) | 2015-11-25 |
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