EP1423216A1 - Cleaning slabs in front of the roller hearth furnace of a mini mill - Google Patents

Cleaning slabs in front of the roller hearth furnace of a mini mill

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Publication number
EP1423216A1
EP1423216A1 EP02776944A EP02776944A EP1423216A1 EP 1423216 A1 EP1423216 A1 EP 1423216A1 EP 02776944 A EP02776944 A EP 02776944A EP 02776944 A EP02776944 A EP 02776944A EP 1423216 A1 EP1423216 A1 EP 1423216A1
Authority
EP
European Patent Office
Prior art keywords
slab
spray
hearth furnace
roller hearth
water
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
EP02776944A
Other languages
German (de)
French (fr)
Other versions
EP1423216B1 (en
Inventor
Bernhard Ehls
Kirsten Fieger-Schlangen
Ingo Schuster
Jürgen Armenat
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 Demag 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 Demag AG filed Critical SMS Demag AG
Publication of EP1423216A1 publication Critical patent/EP1423216A1/en
Application granted granted Critical
Publication of EP1423216B1 publication Critical patent/EP1423216B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product

Definitions

  • the invention relates to a device for removing loose scale from the surface of a slab, in particular a thin slab of a mini mill, comprising at least one slab casting machine, a slab separating device, a temperature compensation furnace and one or more roll stands with a coiler.
  • the invention also relates to an operating method of the device mentioned.
  • the slab supplied by the casting machine is naturally tainted with scale.
  • a slab is fed unpurified to the roller hearth furnace of a mini mill system.
  • scale carried along in the roller hearth furnace builds up on the furnace rollers to irregular scale accumulations (pick-up formation) in the course of the operating time.
  • This can lead to impressions on the underside of the slab and thus to impairment of the surface quality of the slab or of the finished rolled strip.
  • the loosely placed scale acts as an insulation layer, which leads to deteriorated heat transfer when the slab is heated in the roller hearth furnace.
  • document JP 11 04 78 20 describes a process for descaling stubborn scale from the surface of a slab by spraying large amounts of water with low pressure and then spraying it with small amounts of water at high pressure onto the slab surface for the purpose of shock-cooling the surface to 300 to 400 ° C and Rinsing of the dissolved scale by mechanical force.
  • the high-pressure water is sprayed on at approx. 200 to 300 bar in order to mechanically clean the scale.
  • Document JP 10 12 84 25 describes a device for descaling a heated slab on the outlet side of a heating furnace. Approximately 10 seconds after the slab is discharged from the furnace with a pre-descaling device, low-pressure water is first applied to the surface of the slab for 30 seconds to generate a thermal stress, the pressure of the low-pressure water being approximately 20 bar. The high-pressure water is sprayed onto the surface of the slab at approx. 120 bar, 30 seconds after cooling with the low-pressure water, in order to carry out a complete descaling.
  • the invention is based on the object of specifying improved scale cleaning technology and a corresponding spraying device, in particular for mini-mills, in order to carry out a slab cleaning with as little heat loss as possible of the slab, the scale entry into the roller hearth furnace reduce and improve the surface quality of the rolled hot strip.
  • a spray device comprises at least one spray tube installed at the bottom and top relative to the slab, each spray tube being equipped with a number of spray nozzles that the spray device is arranged in front of the temperature compensation furnace, in particular a roller hearth furnace, and that the spray device is connected to a supply for water with technologically required pressure and with a volume flow dimensioned according to the number of spray nozzles.
  • the spray device is designed in such a way that scale and reflecting water are fed to a sintering pit with a separating device for water / solids installed in the drain.
  • a method for spraying loose scale from the surfaces of a slab is advantageously characterized in that the supply pressure of the water to the spray pipes of the spraying device is between 5 and 15 bar, preferably ⁇ 10 bar.
  • the method expediently works according to the thermal shock principle.
  • the spray-off method according to the invention is particularly advantageous if it is carried out before the slabs are placed in the roller hearth furnace.
  • FIG. 1 shows a family tree of the device according to the invention.
  • a slab 1 which is cast as a thin slab in a casting machine (not shown)
  • a roller table 10 is initially conveyed to a directional driver 8, which conveys the thin slab 1 to a spraying device 11 for the slab surface.
  • This spray device 11 forms the actual invention, and comprises at least one lower spray pipe 2 and at least one upper spray pipe 3.
  • the spray pipes 2, 3 are permanently installed and each of the spray pipes is equipped with a number of spray nozzles 4 in the direction of the surface of the slab 1.
  • Each spray tube 2, 3 is connected to a supply 6 for water with technologically required pressure and with a volume flow dimensioned according to the number of nozzles 4.
  • the spray device 11 is arranged in front of the roller hearth furnace 5 but behind the directional driver 8. Between the spraying device 11 and the rolling hearth furnace 5 there is a slab separating device 9 designed as scissors, which cuts the slab into commercially available weights.
  • the scale sprayed off from the scale surface in the spraying device and the reflecting water are fed to a sintering pit 7 with a separating device for water / solids installed in the outlet.
  • the operating parameters of the spray device are set so that the supply pressure of the water to the spray pipes 2, 3 is between 5 and 15 bar, preferably ⁇ 10 bar.
  • the scale that is loosely on the slab surface is detached from the surface and removed using the thermal shock principle.
  • the loosened scale and the spray water are - as mentioned before - directed into the sintering pit 7 and separated there in part.
  • the spraying device 11 is not limited to the arrangement shown in FIG. 1 between the directional driver 8 and the roller hearth furnace 5, but it is possible, without departing from the inventive concept, to arrange the spraying device 11 in the direction of slab passage between the scissors 9 and the roller hearth furnace 5. In the case of a slab installation with a roughing stand which may additionally reduce the slab thickness, the spraying device 11 can be arranged between the roughing stand and the roller hearth furnace 5. Also at In other systems lay-out, the spray device 11 should in any case be used in front of the roller hearth furnace.
  • the slab can be cleaned with little heat loss from the slab. Furthermore, the scale input in the roller hearth furnace and thus the scale build-up on the furnace rollers is reduced. The reduced scale on the slab surfaces improves the heat transfer into the slab in the roller hearth furnace and enables an improvement in the surface quality of the hot strip produced in the subsequent rolling stands.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Metal Rolling (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning In General (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Nozzles For Electric Vacuum Cleaners (AREA)
  • Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
  • Continuous Casting (AREA)

Abstract

The invention relates to a device for removing loose cinder from the surface of a slab, especially a thin slab of a mini mill. One such mini mill comprises at least one slab casting machine, a slab separating device, a thermal compensation furnace and at least one roll stand comprising a reeling installation. The inventive device is improved in that a spray device (11) comprises at least one lower spray pipe (2) and at least one upper spray pipe (3) in relation to the slab (1), each spray pipe being fitted with a number of spray nozzles (4). Said spray device (11) is arranged in front of the roller hearth furnace (5) of the mini mill and is connected to a water supply (6) having the technologically required pressure and a volume flow which is adapted to the number of spray nozzles (4). The invention also relates to an operating method for the spray device (11).

Description

Brammenreinigung vor dem Rollenherdofen einer Mini-MillSlab cleaning in front of the roller hearth furnace of a mini mill
Die Erfindung betrifft eine Vorrichtung zum Entfernen von losem Zunder von der Oberfläche einer Bramme, insbesondere einer Dünnbramme einer Mini-Mill umfassend zumindest eine Brammengießmaschine, eine Brammentrennvor- richtung, einen Temperaturausgleichsofen und ein oder mehrere Walzgerüste mit Haspelanlage. Die Erfindung betrifft auch ein Betriebsverfahren der ge- nannten Vorrichtung.The invention relates to a device for removing loose scale from the surface of a slab, in particular a thin slab of a mini mill, comprising at least one slab casting machine, a slab separating device, a temperature compensation furnace and one or more roll stands with a coiler. The invention also relates to an operating method of the device mentioned.
Die von der Gießmaschine gelieferte Bramme ist naturgemäß mit Zunder behaftet. In der Regel wird eine solche Bramme ungereinigt dem Rollenherdofen einer Mini-Mill-Anlage zugeführt. Das kann dazu führen, dass in den Rollenher- dofen mitgeschleppter Zunder sich auf den Ofenrollen im Laufe der Betriebszeit zu unregelmäßigen Zunderanhäufungen (Pick-Up-Bildung) aufbaut. Dies kann zu Abdrücken auf der Brammenunterseite und somit zu Beeinträchtigungen der Oberflächenqualität der Bramme bzw. des fertig gewalzten Bandes führen. Darüber hinaus wirkt der lose aufliegende Zunder als Dämmschicht, die zu ei- nem verschlechterten Wärmeübergang beim Aufheizen der Bramme im Rollenherdofen führt.The slab supplied by the casting machine is naturally tainted with scale. As a rule, such a slab is fed unpurified to the roller hearth furnace of a mini mill system. This can lead to the fact that scale carried along in the roller hearth furnace builds up on the furnace rollers to irregular scale accumulations (pick-up formation) in the course of the operating time. This can lead to impressions on the underside of the slab and thus to impairment of the surface quality of the slab or of the finished rolled strip. In addition, the loosely placed scale acts as an insulation layer, which leads to deteriorated heat transfer when the slab is heated in the roller hearth furnace.
Verfahren und Vorrichtungen zum Abreinigen von Brammen sowohl von losem als auch von fest anhaftendem Zunder mit Hilfe von Wassersprühstrahlen unter hohem Druck sind bekannt.Methods and devices for cleaning slabs from both loose and firmly adhering scale using water spray jets under high pressure are known.
Beispielsweise beschreibt das Dokument JP 11 04 78 20 ein Verfahren zum Entzundern von hartnäckigem Zunder von der Oberfläche einer Bramme durch aufsprühen großer Wassermengen mit Niederdruck und durch anschießendes Besprühen mit geringen Wassermengen mit Hochdruck auf die Brammenoberfläche zwecks schockartiger Kühlung der Oberfläche auf 300 bis 400 °C und Abspülen des gelösten Zunders durch mechanische Krafteinwirkung. Das Hochdruck-Wasser wird mit ca. 200 bis 300 bar aufgesprüht, um den Zunder mechanisch abzureinigen.For example, document JP 11 04 78 20 describes a process for descaling stubborn scale from the surface of a slab by spraying large amounts of water with low pressure and then spraying it with small amounts of water at high pressure onto the slab surface for the purpose of shock-cooling the surface to 300 to 400 ° C and Rinsing of the dissolved scale by mechanical force. The high-pressure water is sprayed on at approx. 200 to 300 bar in order to mechanically clean the scale.
Das Dokument JP 10 12 84 25 beschreibt eine Vorrichtung zur Entzunderung einer erhitzen Bramme an der Auslaßseite eines Erwärmungsofens. Dabei wird annähernd 10 Sekunden nach Auslaß der Bramme aus dem Ofen mit einer Vorentzunderungsvorrichtung zunächst Niederdruck-Wasser 30 Sekunden lang auf die Oberfläche der Bramme zur Erzeugung einer thermischen Spannung aufgebracht, wobei der Druck des Niederdruck-Wassers ca. 20 bar beträgt. Das Hochdruck-Wasser wird mit ca. 120 bar auf die Oberfläche der Bramme gedüst und zwar 30 Sekunden nach dem Abkühlen durch das Niederdruck-Wasser, um eine vollständige Entzunderung durchzuführen.Document JP 10 12 84 25 describes a device for descaling a heated slab on the outlet side of a heating furnace. Approximately 10 seconds after the slab is discharged from the furnace with a pre-descaling device, low-pressure water is first applied to the surface of the slab for 30 seconds to generate a thermal stress, the pressure of the low-pressure water being approximately 20 bar. The high-pressure water is sprayed onto the surface of the slab at approx. 120 bar, 30 seconds after cooling with the low-pressure water, in order to carry out a complete descaling.
Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Auf- gäbe zugrunde, eine verbesserte Zunder-Abreinigungs-Technologie und eine entsprechende Abspritzeinrichtung insbesondere für Mini-Mills anzugeben, um eine Brammenreinigung mit möglichst geringem Wärmeverlust der Bramme durchzuführen, den Zundereintrag in den Rollenherdofen zu verringern und die Oberflächenqualität des gewalzten Warmbandes zu verbessern.Proceeding from the aforementioned prior art, the invention is based on the object of specifying improved scale cleaning technology and a corresponding spraying device, in particular for mini-mills, in order to carry out a slab cleaning with as little heat loss as possible of the slab, the scale entry into the roller hearth furnace reduce and improve the surface quality of the rolled hot strip.
Zur Lösung der Aufgabe sieht die Erfindung bei einer Vorrichtung der im Oberbegriff von Anspruch 1 bezeichneten Art vor, dass eine Abspritzvorrichtung mindestens je ein relativ zur Bramme unteres und oberes installiertes Spritzrohr umfaßt, wobei jedes Spritzrohr mit einer Anzahl von Spritzdüsen bestückt ist, dass die Abspritzvorrichtung vor dem Temperaturausgleichsofen, insbesondere einem Rollenherdofen angeordnet ist und dass die Abspritzvorrichtung an eine Zuführung für Wasser mit technologisch erforderlichem Druck und mit einem entsprechend der Anzahl der Spritzdüsen bemessenen Volumenstrom angeschlossen ist. Mit den angegebenen Erfindungsmerkmalen wird eine Brammenreinigung mit möglichst geringem Wärmeverlust verwirklicht, der Zundereintrag in den Rollenherdofen verringert und eine Verringerung der Pick-Up-Bildung auf den Ofenrollen des Rollenherdofens erreicht. Ferner wird im Rollenherdofen der Wärmeübergang in die Bramme verbessert und insgesamt eine Steigerung der Oberflächenqualität des Warmbandes erzielt.To achieve the object, the invention provides in a device of the type referred to in the preamble of claim 1 that a spray device comprises at least one spray tube installed at the bottom and top relative to the slab, each spray tube being equipped with a number of spray nozzles that the spray device is arranged in front of the temperature compensation furnace, in particular a roller hearth furnace, and that the spray device is connected to a supply for water with technologically required pressure and with a volume flow dimensioned according to the number of spray nozzles. With the specified features of the invention, slab cleaning with the lowest possible heat loss is realized, the scale input in the roller hearth furnace is reduced and the pick-up formation on the furnace rollers of the roller hearth furnace is reduced. Furthermore, the heat transfer into the slab is improved in the roller hearth furnace and an overall increase in the surface quality of the hot strip is achieved.
In Ausgestaltung der Erfindungsmerkmale ist vorgesehen, dass die Abspritzvorrichtung so konzipiert ist, dass anfallender Zunder und reflektierendes Wasser einer Sintergrube mit einer im Ablauf installierten Trenneinrichtung für Was- ser/Feststoff zugeführt wird.In an embodiment of the features of the invention, it is provided that the spray device is designed in such a way that scale and reflecting water are fed to a sintering pit with a separating device for water / solids installed in the drain.
Weitere Ausgestaltungen der erfindungsgemäßen Vorrichtung sind entsprechend den Unteransprüchen vorgesehen.Further refinements of the device according to the invention are provided in accordance with the subclaims.
Ein Verfahren zum Abspritzen von losem Zunder von den Oberflächen einer Bramme zeichnet sich mit Vorteil dadurch aus, dass der Zuführdruck des Wassers zu den Spritzrohren der Abspritzvorrichtung zwischen 5 und 15 bar, vorzugsweise < 10 bar beträgt. Zweckmäßigerweise arbeitet das Verfahren nach dem Thermo-Schock-Prinzip.A method for spraying loose scale from the surfaces of a slab is advantageously characterized in that the supply pressure of the water to the spray pipes of the spraying device is between 5 and 15 bar, preferably <10 bar. The method expediently works according to the thermal shock principle.
Besonders vorteilhaft ist das erfindungsgemäße Abspritzverfahren, wenn es vor Aufgabe der Brammen in den Rollenherdofen durchgeführt wird.The spray-off method according to the invention is particularly advantageous if it is carried out before the slabs are placed in the roller hearth furnace.
Weitere vorteilhafte Ausgestaltungen des Arbeitsverfahrens sind in den weite- ren Unteransprüchen angegeben.Further advantageous refinements of the working method are specified in the further subclaims.
Nachfolgend wird die Erfindung anhand einer Zeichnung weiter erläutert.The invention is explained in more detail below with the aid of a drawing.
Die Figur 1 zeigt einen Stammbaum der erfindungsgemäßen Vorrichtung. Ent- sprechend der schematischen Darstellung wird eine Bramme 1 , die in einer nicht näher gezeichneten Gießmaschine als Dünnbramme gegossen wird, auf einem Rollgang 10 zunächst zu einem Richttreiber 8 gefördert, der die Dünnbramme 1 zu einer Abspritzvorrichtung 11 für die Brammenoberfläche fördert. Diese Abspritzvorrichtung 11 bildet die eigentliche Erfindung, und umfaßt mindestens ein unteres Spritzrohr 2 und mindestens ein oberes Spritzrohr 3. Die Spritzrohre 2, 3 sind fest installiert und jedes der Spritzrohre ist mit einer Anzahl von Spritzdüsen 4 in Richtung zur Oberfläche der Bramme 1 bestückt. Jedes Spritzrohr 2, 3 ist an eine Zuführung 6 für Wasser mit technologisch erforderlichem Druck und mit einem entsprechend der Anzahl der Düsen 4 bemessenen Volumenstrom angeschlossen. Die Abspritzvorrichtung 11 ist vor dem Rollenherdofen 5 aber hinter dem Richttreiber 8 angeordnet. Zwischen der Abspritz- Vorrichtung 11 und dem Rollen herdofen 5 befindet sich eine als Schere ausgebildete Brammentrennvorrichtung 9, welche die Bramme in handelsübliche Gewichte ablängt.FIG. 1 shows a family tree of the device according to the invention. In accordance with the schematic illustration, a slab 1, which is cast as a thin slab in a casting machine (not shown), is opened a roller table 10 is initially conveyed to a directional driver 8, which conveys the thin slab 1 to a spraying device 11 for the slab surface. This spray device 11 forms the actual invention, and comprises at least one lower spray pipe 2 and at least one upper spray pipe 3. The spray pipes 2, 3 are permanently installed and each of the spray pipes is equipped with a number of spray nozzles 4 in the direction of the surface of the slab 1. Each spray tube 2, 3 is connected to a supply 6 for water with technologically required pressure and with a volume flow dimensioned according to the number of nozzles 4. The spray device 11 is arranged in front of the roller hearth furnace 5 but behind the directional driver 8. Between the spraying device 11 and the rolling hearth furnace 5 there is a slab separating device 9 designed as scissors, which cuts the slab into commercially available weights.
Der in der Abspritzvorrichtung von der Zunderoberfläche abgespritze Zunder und das reflektierende Wasser wird einer Sintergrube 7 mit einer im Ablauf installierten Trenneinrichtung für Wasser/Feststoff zugeführt. Die Betriebsparameter der Abspritzvorrichtung sind so eingestellt, dass der Zuführungsdruck des Wassers zu den Spritzrohren 2, 3 zwischen 5 und 15 bar, vorzugsweise < 10 bar beträgt. Der lose auf der Brammenoberfläche befindliche Zunder wird nach dem Thermo-Schock-Prinzip von der Oberfläche gelöst und entfernt. Der gelöste Zunder und das Spritzwasser wird - wie zuvor gesagt - in die Sintergrube 7 geleitet und dort bestandsteilmäßig getrennt.The scale sprayed off from the scale surface in the spraying device and the reflecting water are fed to a sintering pit 7 with a separating device for water / solids installed in the outlet. The operating parameters of the spray device are set so that the supply pressure of the water to the spray pipes 2, 3 is between 5 and 15 bar, preferably <10 bar. The scale that is loosely on the slab surface is detached from the surface and removed using the thermal shock principle. The loosened scale and the spray water are - as mentioned before - directed into the sintering pit 7 and separated there in part.
Die Abspritzvorrichtung 11 ist nicht auf die in Figur 1 gezeigte Anordnung zwi- sehen Richttreiber 8 und Rollenherdofen 5 beschränkt, sondern es ist, ohne den Erfindungsgedanken zu verlassen, möglich, die Abspritzvorrichtung 11 in Brammendurchlaufrichtung zwischen der Schere 9 und dem Rollenherdofen 5 anzuordnen. Bei einer Brammenanlage mit gegebenenfalls zusätzlich die Brammendicke reduzierendem Vorgerüst kann die Abspritzvorrichtung 11 zwi- sehen dem Vorgerüst und dem Rollenherdofen 5 angeordnet sein. Auch bei anderem Anlagen lay-out sollte die Abspritzvorrichtung 11 jedenfalls vor dem Rollenherdofen eingesetzt werden.The spraying device 11 is not limited to the arrangement shown in FIG. 1 between the directional driver 8 and the roller hearth furnace 5, but it is possible, without departing from the inventive concept, to arrange the spraying device 11 in the direction of slab passage between the scissors 9 and the roller hearth furnace 5. In the case of a slab installation with a roughing stand which may additionally reduce the slab thickness, the spraying device 11 can be arranged between the roughing stand and the roller hearth furnace 5. Also at In other systems lay-out, the spray device 11 should in any case be used in front of the roller hearth furnace.
Mit der erfindungsgemäßen Abspritzvorrichtung, die im Gegensatz zum Stand der Technik kein Zunderwäscher zum Entfernen von fest sitzendem Primärzun- der ist, kann die Brammen reinigung mit geringen Wärmeverlusten der Bramme durchgeführt werden. Ferner wird der Zundereintrag in den Rollenherdofen und damit der Zunderaufbau auf den Ofenrollen vermindert. Der verringerte Zunder auf den Brammenoberflächen verbessert den Wärmeübergang in die Bramme im Rollenherdofen und ermöglicht eine Verbesserung der Oberflächenqualität des in den nachfolgenden Walzgerüsten hergestellten Warmbandes. With the spray device according to the invention, which, in contrast to the prior art, is not a scale washer for removing tightly fitting primary cinder, the slab can be cleaned with little heat loss from the slab. Furthermore, the scale input in the roller hearth furnace and thus the scale build-up on the furnace rollers is reduced. The reduced scale on the slab surfaces improves the heat transfer into the slab in the roller hearth furnace and enables an improvement in the surface quality of the hot strip produced in the subsequent rolling stands.

Claims

Patentansprüche claims
1. Vorrichtung zum Entfernen von losem Zunder von der Oberfläche einer Bramme, insbesondere einer Dünnbramme einer Mini-Mill umfassend zumindest eine Brammengießmaschine, eine Brammentrenneinrichtung, ei- nen Temperaturausgleichsofen und ein oder mehrere Walzgerüste mit1. Device for removing loose scale from the surface of a slab, in particular a thin slab of a mini mill, comprising at least one slab casting machine, a slab separating device, a temperature compensation furnace and one or more rolling stands
Haspelanlage, dadurch gekennzeichnet, dass eine Abspritzvorrichtung (11) mindestens je ein relativ zur BrammeCoiler system, characterized in that a spray device (11) at least one relative to the slab
(1) unteres (2) und oberes (3) installiertes Spritzrohr umfaßt, wobei jedes Spritzrohr (2, 3) mit einer Anzahl von Spritzdüsen (4) bestückt ist, dass die Abspritzvorrichtung (11) vor dem Temperaturausgleichsofen (5), insbesondere ein Rollenherdofen, angeordnet ist und dass die Abspritzvorrichtung (11) an eine Zuführung (6) für Wasser mit technologisch erforderlichem Druck und mit einem entsprechend der An- zahl der Spritzdüsen bemessenem Volumenstrom angeschlossen ist.(1) lower (2) and upper (3) installed spray tube, each spray tube (2, 3) is equipped with a number of spray nozzles (4) that the spray device (11) in front of the temperature compensation oven (5), in particular a Roller hearth furnace, is arranged and that the spray device (11) is connected to a feed (6) for water with technologically required pressure and with a volume flow dimensioned according to the number of spray nozzles.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Abspritzvorrichtung (11) so konzipiert ist, dass anfallender Zun- der und reflektierendes Wasser einer Sintergrube (7) mit einer im Ablauf installierten Trenneinrichtung für Wasser/Feststoff zugeführt wird.2. Device according to claim 1, characterized in that the spray device (11) is designed such that accumulating change and reflecting water is fed to a sintering pit (7) with a separating device for water / solid installed in the outlet.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Abspritzvorrichtung (11) in Brammendurchlaufrichtung zwischen einem Richttreiber (8) und dem Rollenherdofen (5) angeordnet ist. 3. Device according to claim 1 or 2, characterized in that the spray device (11) is arranged in the slab passage direction between a directional driver (8) and the roller hearth furnace (5).
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass zwischen der Abspritzvorrichtung (11 ) und dem Rollenherdofen (5) die Brammentrennvorrichtung (9), insbesondere eine Schere angeordnet ist.4. The device according to claim 3, characterized in that between the spray device (11) and the roller hearth furnace (5), the slab separating device (9), in particular a pair of scissors, is arranged.
5. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Abspritzvorrichtung (11) in Brammendurchlauf zwischen der Brammentrennvorrichtung (9) und dem Rollenherdofen (5) angeordnet ist.5. The device according to claim 1 or 2, characterized in that the spraying device (11) is arranged in slab passage between the slab separating device (9) and the roller hearth furnace (5).
6. Verfahren zum Betrieb der Vorrichtung zum Entfernen von losem Zunder von der Oberfläche einer Bramme, insbesondere einer Dünnbramme einer Mini-Mill mit Hilfe einer Abspritzvorrichtung (11) gemäß den Ansprüchen 1 bis 5, dadurch gekennzeichnet, dass der Zuführdruck des Wassers zu den Spritzrohren (2, 3) der Abspritzvorrichtung (11) zwischen 5 und 15 bar, vorzugsweise < 10 bar beträgt.6. A method of operating the device for removing loose scale from the surface of a slab, in particular a thin slab of a mini mill with the aid of a spray device (11) according to claims 1 to 5, characterized in that the supply pressure of the water to the spray tubes (2, 3) of the spray device (11) is between 5 and 15 bar, preferably <10 bar.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass der lose auf der Brammenoberfläche anhaftende Zunder nach dem Thermo-Schock-Prinzip entfernt wird.7. The method according to claim 6, characterized in that the loosely adhering to the slab surface scale is removed according to the thermal shock principle.
8. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Entzunderung mit möglichst geringem Wärmeverlust der Bramme (1) durchgeführt wird. Verfahren nach Anspruch 6, 7 oder 8, dadurch gekennzeichnet, dass das Abspritzverfahren vor Aufgabe der Bramme (1) in den Rollenherdofen (5) durchgeführt wird. 8. The method according to claim 6 or 7, characterized in that the descaling is carried out with the lowest possible heat loss of the slab (1). A method according to claim 6, 7 or 8, characterized in that the spraying process is carried out before the slab (1) is placed in the roller hearth furnace (5).
EP02776944A 2001-09-07 2002-08-28 Cleaning slabs in front of the roller hearth furnace of a mini mill Expired - Lifetime EP1423216B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10143868A DE10143868A1 (en) 2001-09-07 2001-09-07 Device for removing loose cinder from the surface of a thin slab of a mini mill has a spray unit arranged before a temperature compensation oven and connected to a water supply
DE10143868 2001-09-07
PCT/EP2002/009572 WO2003022475A1 (en) 2001-09-07 2002-08-28 Cleaning slabs in front of the roller hearth furnace of a mini mill

Publications (2)

Publication Number Publication Date
EP1423216A1 true EP1423216A1 (en) 2004-06-02
EP1423216B1 EP1423216B1 (en) 2005-02-16

Family

ID=7698032

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Application Number Title Priority Date Filing Date
EP02776944A Expired - Lifetime EP1423216B1 (en) 2001-09-07 2002-08-28 Cleaning slabs in front of the roller hearth furnace of a mini mill

Country Status (16)

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US (1) US20040261206A1 (en)
EP (1) EP1423216B1 (en)
JP (1) JP2005501729A (en)
KR (1) KR100880148B1 (en)
CN (1) CN1553833A (en)
AT (1) ATE289233T1 (en)
AU (1) AU2002339453B2 (en)
BR (1) BR0212218B1 (en)
CA (1) CA2459881C (en)
DE (2) DE10143868A1 (en)
EG (1) EG23334A (en)
ES (1) ES2236593T3 (en)
MX (1) MXPA04002153A (en)
RU (1) RU2296021C2 (en)
UA (1) UA78237C2 (en)
WO (1) WO2003022475A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005047936A1 (en) * 2005-10-06 2007-04-12 Sms Demag Ag Method and device for cleaning slabs, thin slabs, profiles or the like
DE102006004688A1 (en) * 2006-02-02 2007-08-16 Sms Demag Ag Method and casting-rolling plant for producing hot-rolled metal - in particular high-quality steel-material strip
EP2028290A1 (en) * 2007-08-21 2009-02-25 ArcelorMittal France Method and device for secondary descaling steel strip with low pressure water jets
CN101181718B (en) * 2007-12-11 2010-06-02 武汉钢铁(集团)公司 Method for producing wide strip steel by bar strip continuous casting and rolling as well as system therefor
RU2484918C1 (en) * 2012-02-16 2013-06-20 Федеральное государственное унитарное предприятие "Центральный научно-исследовательский институт черной металлургии им. И.П. Бардина" Method of continuous casting
CN108838845B (en) * 2017-03-15 2020-05-22 广东省陶瓷研究所 Mechanical device for renovating ceramic burning bearing plate

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Also Published As

Publication number Publication date
BR0212218B1 (en) 2010-06-29
US20040261206A1 (en) 2004-12-30
CN1553833A (en) 2004-12-08
DE50202292D1 (en) 2005-03-24
BR0212218A (en) 2004-09-21
DE10143868A1 (en) 2003-03-27
UA78237C2 (en) 2007-03-15
KR100880148B1 (en) 2009-01-23
CA2459881C (en) 2010-08-24
EG23334A (en) 2004-12-29
RU2004110403A (en) 2005-06-10
AU2002339453B2 (en) 2008-02-21
MXPA04002153A (en) 2004-07-23
KR20040029467A (en) 2004-04-06
CA2459881A1 (en) 2003-03-20
ES2236593T3 (en) 2005-07-16
JP2005501729A (en) 2005-01-20
ATE289233T1 (en) 2005-03-15
WO2003022475A1 (en) 2003-03-20
EP1423216B1 (en) 2005-02-16
RU2296021C2 (en) 2007-03-27

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