EP0992304B1 - Process for measuring and regulating temperature and quantity of cooling water in the walls of a continuous casting mould - Google Patents
Process for measuring and regulating temperature and quantity of cooling water in the walls of a continuous casting mould Download PDFInfo
- Publication number
- EP0992304B1 EP0992304B1 EP99116306A EP99116306A EP0992304B1 EP 0992304 B1 EP0992304 B1 EP 0992304B1 EP 99116306 A EP99116306 A EP 99116306A EP 99116306 A EP99116306 A EP 99116306A EP 0992304 B1 EP0992304 B1 EP 0992304B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- temperature
- cooling
- cooling water
- region
- 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.)
- Expired - Lifetime
Links
- 239000000498 cooling water Substances 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 7
- 238000009749 continuous casting Methods 0.000 title claims description 3
- 230000001105 regulatory effect Effects 0.000 title claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000009835 boiling Methods 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 239000010949 copper Substances 0.000 claims abstract description 10
- 238000001704 evaporation Methods 0.000 claims abstract description 8
- 230000008020 evaporation Effects 0.000 claims abstract description 8
- 239000002826 coolant Substances 0.000 claims description 4
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
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
Definitions
- the invention relates. a method for measuring and regulating temperature and quantity of per unit time by water-coolable, especially from each other independent mold walls made of cooling water flowing through copper plates a continuous casting mold, the cooling water temperature a mold wall in at least two places in the area of the drain openings a copper plate and the associated water tank is measured.
- the process is operated in such a way that cooling water inlet holes interacting the water supply in cooling channels of the mold wall form while the sum of drain holes of the cooling channels taken together form the water outlet, the inlet temperature of the cooling water, the difference between the inlet and outlet temperatures determined and from the amount of cooling water per unit of time partial integral heat dissipation from a mold or from a Mold wall area determined and a temperature profile created and temperature profiles obtained in time intervals with each other compared and partial inequalities through partial quantity corrections of the cooling water are balanced.
- the flow velocity is usually used and the water pressure on the outlet side of the Water cooling system chosen so that for the hottest point of the The temperatures on the surface of the cooling channel below the mold The boiling temperature of the water is in accordance with the outlet pressure.
- the additional registration is based on the task of the procedure of the main patent (patent application 197 22 877) further train and improve and through targeted cooling a Equalization of the temperature distribution in the area of the bath level of molds, in particular molds for casting thinner Slabs to achieve.
- the object is achieved with the invention in that the Flow rate and the water pressure of the cooling system so be set so that the lowest temperature in the range of Water outlet side or the water outlet opening of a copper plate is at the boiling point limit, and that for everyone higher temperatures a bubble evaporation during supercooled boiling of the cooling water is excited.
- the measure Be made use of that the flow rate and the Coolant pressure in the cooling channels can be set constantly, such that an increased heat load by a corresponding increased bubble evaporation is compensated.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Die Erfindung betrifft. ein Verfahren zum Messen und Regeln von Temperatur und Menge des pro Zeiteinheit durch wasserkühlbare, insbesondere voneinander unabhängige Kokillenwände aus Kupferplatten durchströmenden Kühlwassers einer Stranggießkokille, wobei die Kühlwassertemperatur einer Kokillenwand an wenigstens zwei Stellen im Bereich der Ablauföffnungen einer Kupferplatte und dem zugeordneten Wasserkasten gemessen wird.The invention relates. a method for measuring and regulating temperature and quantity of per unit time by water-coolable, especially from each other independent mold walls made of cooling water flowing through copper plates a continuous casting mold, the cooling water temperature a mold wall in at least two places in the area of the drain openings a copper plate and the associated water tank is measured.
Das Verfahren wird in der Weise betrieben, daß Kühlwasserzulaufbohrungen zusammenwirkend den Wasserzulauf in Kühlkanäle der Kokillenwand bilden, während die Summe von Ablaufbohrungen der Kühlkanäle zusammengenommen den Wasserablauf bilden, wobei die Zulauftemperatur des Kühlwassers gemessen, die Differenz aus Zulauf- und Ablauftemperatur ermittelt und aus der Kühlwassermenge pro Zeiteinheit die partielle integrale Wärmeabfuhr aus einer Kokille bzw. aus einem Kokillenwandbereich ermittelt und ein Temperaturprofil erstellt wird, und in Zeitintervallen gewonnene Temperaturprofile miteinander verglichen und partielle Ungleichheiten durch partielle Mengenkorrekturen des Kühlwassers ausgeglichen werden.The process is operated in such a way that cooling water inlet holes interacting the water supply in cooling channels of the mold wall form while the sum of drain holes of the cooling channels taken together form the water outlet, the inlet temperature of the cooling water, the difference between the inlet and outlet temperatures determined and from the amount of cooling water per unit of time partial integral heat dissipation from a mold or from a Mold wall area determined and a temperature profile created and temperature profiles obtained in time intervals with each other compared and partial inequalities through partial quantity corrections of the cooling water are balanced.
Bei der Auslegung der Kokillenkühlung wird üblicherweise die Strömungsgeschwindigkeit und der Wasserdruck an der Austrittsseite des Wasserkühlsystems so gewählt, daß für die heißeste Stelle der Kokille die Temperaturen an der Oberfläche des Kühlkanals unter der Siedetemperatur des Wassers entsprechend dem Austrittsdruck liegen. Dabei ergibt sich an der Oberfläche zum Strang im Bereich des Badspiegels eine unterschiedliche wärmebelastung, die zu unterschiedlichem Aufschmelzverhalten des Gießpulvers und damit zu Ungleichmäßigkeiten in der Ausbildung der noch sehr empfindlichen Strangschale führt.When designing the mold cooling, the flow velocity is usually used and the water pressure on the outlet side of the Water cooling system chosen so that for the hottest point of the The temperatures on the surface of the cooling channel below the mold The boiling temperature of the water is in accordance with the outlet pressure. This results on the surface of the strand in the area of Bath levels have a different heat load, which leads to different Melting behavior of the mold powder and thus too Irregularities in the training of the still very sensitive Strand shell leads.
Der Zusatzanmeldung liegt die Aufgabe zugrunde, den Gegenstand bzw. das Verfahren des Hauptpatents (Patentanmeldung 197 22 877) weiter auszubilden und zu verbessern und durch gezielte Kühlung eine Egalisierung der Temperatur-Verteilung im Bereich des Badspiegels von Kokillen, insbesondere von Kokillen zum Gießen von dünneren Brammen, zu erreichen.The additional registration is based on the task of the procedure of the main patent (patent application 197 22 877) further train and improve and through targeted cooling a Equalization of the temperature distribution in the area of the bath level of molds, in particular molds for casting thinner Slabs to achieve.
Die Lösung der Aufgabe gelingt mit der Erfindung dadurch, daß die Strömungsgeschwindigkeit und der Wasserdruck des Kühlsystems so eingestellt werden, daß die niedrigste Temperatur im Bereich der Wasser-Austrittsseite bzw. der Wasser-Ablauföffnung einer Kupferplatte an der Grenze der Siedetemperatur liegt, und daß für alle höheren Temperaturen eine Blasenverdampfung beim unterkühlten Sieden des Kühlwassers angeregt wird.The object is achieved with the invention in that the Flow rate and the water pressure of the cooling system so be set so that the lowest temperature in the range of Water outlet side or the water outlet opening of a copper plate is at the boiling point limit, and that for everyone higher temperatures a bubble evaporation during supercooled boiling of the cooling water is excited.
Mit großem Vorteil wird erreicht, daß die wärmestromdichte beim Wärmeübergang vom Metallbad über die kupferne Kokillenwand auf das Kühlmedium Wasser infolge des hohen Verbrauchs an Verdampfungswärme für die Blasenverdampfung signifikant erhöht und mit steigender Überschreitung der Siedetemperatur durch entsprechende Intensivierung der Blasenverdampfung weiter derart erhöht wird, daß sich die Temperaturunterschiede über die Kokillenbreite signifikant verringern.It is achieved with great advantage that the heat flow density at Heat transfer from the metal bath over the copper mold wall to the Cooling medium water due to the high consumption of heat of vaporization for bubble evaporation significantly increased and with increasing Boiling temperature exceeded by appropriate intensification the bubble evaporation is further increased such that the Significantly reduce temperature differences across the mold width.
Damit gelingt eine Egalisierung der Temperaturverteilung im Bereich des Badspiegels von Kokillen durch gezielte Kühlung der Kokillenwände und damit auch des Metallbades mit Hilfe des unterkühlten Siedens des Kühlmediums Wasser. Hierdurch ergibt sich an der Oberfläche der die Kokille bildenden Kupferplatten eine Vergleichmäßigung der Wärmebelastung, die in der Folge zu gleichmäßigerem Aufschmelzen des Gießpulvers und zu örtlich gleichmäßigerer Ausbildung der Strangschale bei deren Wärmekontakt mit den Kupferplatten der Kokille führt. Besonders trägt zu diesem vorteilhaften Ergebnis bei, daß entsprechend einer Überschreitung der Siedetemperatur die Blasenverdampfung mit analoger Intensivierung unter Erhöhung der Wärmestromdichte reagiert. Zu diesem Zweck kann von der Maßnahme Gebrauch gemacht sein, daß die Strömungsgeschwindigkeit und der Kühlmitteldruck in den Kühlkanälen konstant eingestellt werden, derart, daß eine erhöhte Wärmebelastung durch eine entsprechend erhöhte Blasenverdampfung kompensiert wird.This enables the temperature distribution in the area to be equalized the bath level of molds by targeted cooling of the mold walls and thus also the metal bath with the help of supercooled boiling of the cooling medium water. This results in the the mold-forming copper plates an equalization of the Heat load, which subsequently leads to more uniform melting of the mold powder and for a more uniform local formation of the Strand shell when it comes into thermal contact with the copper plates of the Mold leads. Particularly contributes to this advantageous result, that if the boiling temperature is exceeded, the Bubble evaporation with analog intensification while increasing the Heat flow density reacts. To this end, the measure Be made use of that the flow rate and the Coolant pressure in the cooling channels can be set constantly, such that an increased heat load by a corresponding increased bubble evaporation is compensated.
Anhand einer graphischen Darstellung wird das Verfahren verdeutlicht, wobei die Wärmestromdichte auf der Ordinate über der überhitzungstemperatur auf der Abszisse des Diagramms aufgetragen ist und W für die Wassergeschwindigkeit steht.The process is illustrated using a graphic representation, where the heat flow density on the ordinate is above the superheating temperature is plotted on the abscissa of the diagram and W stands for the water speed.
Claims (2)
- Method of measuring and regulating temperature and quantity of cooling water, which flows per unit time through water-coolable chill mould walls, in particular, independent of one another and consisting of copper plates, of a continuous casting chill mould, wherein the cooling water temperature of a chill mould wall is measured at at least two places in the region of the drain opening of a copper plate and the associated water tank, characterised in that the flow speed and the water pressure of the cooling system are so set in the region of the water outlet side or the water drain openings of a copper plate that the lowest temperature in the region of the water outlet lies at the limit of the boiling temperature and that for all higher temperatures a bubble evaporation is stimulated in the case of sub-cooled boiling of the cooling water.
- Method according to claim 1, characterised in that the flow speed and the coolant pressure in the cooling channels is set to be constant in such a manner that compensation for an increased heat loading is provided by a correspondingly increased bubble evaporation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1998138331 DE19838331A1 (en) | 1997-05-31 | 1998-08-24 | Measuring and control of the temperature and volume of cooling water for a continuous casting mold involves adjusting the water flow rate and pressure at the exit from the mold plates |
| DE19838331 | 1998-08-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0992304A1 EP0992304A1 (en) | 2000-04-12 |
| EP0992304B1 true EP0992304B1 (en) | 2003-10-01 |
Family
ID=7878485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99116306A Expired - Lifetime EP0992304B1 (en) | 1998-08-24 | 1999-08-19 | Process for measuring and regulating temperature and quantity of cooling water in the walls of a continuous casting mould |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6415850B1 (en) |
| EP (1) | EP0992304B1 (en) |
| AT (1) | ATE250998T1 (en) |
| DE (1) | DE59907176D1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10329033A1 (en) * | 2003-06-27 | 2005-01-13 | Sms Demag Ag | Method and measuring arrangement for detecting nucleate boiling in the cooling channels of a continuous casting mold |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3423475C2 (en) * | 1984-06-26 | 1986-07-17 | Mannesmann AG, 4000 Düsseldorf | Method and device for the continuous casting of liquid metals, in particular of liquid steel |
| US4749023A (en) * | 1986-04-30 | 1988-06-07 | Westinghouse Electric Corp. | Cooling system for continuous metal casting machines |
| DE4117073A1 (en) * | 1991-05-22 | 1992-11-26 | Mannesmann Ag | TEMPERATURE MEASUREMENT SLAM CHOCOLATE |
| DE19529931C1 (en) * | 1995-08-02 | 1997-04-03 | Mannesmann Ag | Plate mold for the production of steel strands |
| DE19722877C2 (en) * | 1997-05-31 | 1999-09-09 | Schloemann Siemag Ag | Liquid-cooled continuous casting mold |
-
1999
- 1999-08-19 EP EP99116306A patent/EP0992304B1/en not_active Expired - Lifetime
- 1999-08-19 DE DE59907176T patent/DE59907176D1/en not_active Expired - Lifetime
- 1999-08-19 US US09/377,351 patent/US6415850B1/en not_active Expired - Fee Related
- 1999-08-19 AT AT99116306T patent/ATE250998T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| US6415850B1 (en) | 2002-07-09 |
| DE59907176D1 (en) | 2003-11-06 |
| EP0992304A1 (en) | 2000-04-12 |
| ATE250998T1 (en) | 2003-10-15 |
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