EP0266302B1 - Cooling aggregate and method for cooling hotrolled rolling stock with/without direct patenting in presswater - Google Patents
Cooling aggregate and method for cooling hotrolled rolling stock with/without direct patenting in presswater Download PDFInfo
- Publication number
- EP0266302B1 EP0266302B1 EP87710010A EP87710010A EP0266302B1 EP 0266302 B1 EP0266302 B1 EP 0266302B1 EP 87710010 A EP87710010 A EP 87710010A EP 87710010 A EP87710010 A EP 87710010A EP 0266302 B1 EP0266302 B1 EP 0266302B1
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- European Patent Office
- Prior art keywords
- cooling
- presswater
- rolling stock
- pressure
- chamber
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- 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.)
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- 238000001816 cooling Methods 0.000 title claims description 116
- 238000005096 rolling process Methods 0.000 title claims description 76
- 238000000034 method Methods 0.000 title claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 89
- 238000001704 evaporation Methods 0.000 claims description 20
- 230000008020 evaporation Effects 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 18
- 238000009835 boiling Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 230000004075 alteration Effects 0.000 claims 1
- 238000009825 accumulation Methods 0.000 description 10
- 238000009833 condensation Methods 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003623 enhancer Substances 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 241001136792 Alle Species 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000009331 sowing Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 230000035899 viability Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
-
- 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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
Definitions
- the invention relates, according to the preamble of claim 1, to a method with a cooling unit for cooling hot rolled rolling stock, with / without direct patenting, in which pressurized water is pressed within a pressure chamber between accumulation edges (constrictions in the pressurized water flow cross-section) onto the hot-rolled rolling stock surface; see DE-A 1 608 327.
- the invention also relates to a device for carrying out the method having the features according to the preamble of claim 2.
- a method with a cooling unit is useful that on the one hand enables the desired cooling temperature to be reached with little use of the agents and on the other hand prevents undesired overcooling of the edge zone of the rolling stock, which can lead to the formation of undesirable structural components in the finished rolling stock.
- a method with a cooling unit is useful, which on the one hand enables the desired cooling temperature to be reached with little use of the agent and on the other hand enables the freely selected microstructure profile in the finished rolling stock to be achieved without undesirable structural components.
- the hot rolled rolling stock is predominantly cooled with water in one or at intervals, partly with water and then with Blown air or air alone.
- cooling hot strip 8000 m3 / h and more cooling water are used in the spray nozzle and laminar water cooling, on the other hand wire rod with 5.5 mm diameter, from 1000 ° to 650 °, on one wire rolling mill with 240 m3 / h and the other cooled down with 70 m3 / h cooling water.
- These widely differing amounts of cooling water show that with conventional cooling, a very different amount of heat is extracted from the hot rolled rolling stock per m3 of cooling water.
- 5 to 8 are shown for the measurement record at the cooling temperature, the measurement records of the pressure in the pressurized water line and that of the pressurized water quantities, and the symbol for the pressure chamber length.
- the numbers for the length of the pressure chamber and the amount of pressure water are ratio numbers.
- the heat withdrawal increased in seconds oscillating to full evaporation, in which the steam pressure made the pressure chamber free of pressurized water for seconds until just as quickly pressurized water flowed in again and the process was repeated at an ever higher heat transfer value level, whereby the cooling temperature has dropped in a self-propelled manner so that the finished rolled product could not have a uniform structure over the length.
- the invention is based on the object of being able to carry out the cooling of hot rolled rolling stock, from hot wide strip to wire rod, with / without direct patenting, in pressurized water in such a way that during and after the cooling thus carried out, no detectable undesirable, quality-dependent, cooling-related structural components form in the finished rolling stock can and the use of funds is comparatively low.
- the cooling unit is pressurized with the amount of pressurized water that is necessary for the cooling unit, preferably in equilibrium with the amount of heat to be removed from the rolling stock, so that the heat is removed by heating of the pressurized water in the pressure chamber of the convection cooling part, in the convection pressure chamber, and the removal of heat by the evaporation heat given off to the pressurized water / steam mixture in the pressure chamber of the evaporative cooling part, in the evaporation pressure chamber, preferably up to the boiling point of the pressurized water, to the desired cooling temperature of the rolling stock is and the cooling in the pressurized water and in the pressurized water-steam mixture is carried out in such a way that, during and after the cooling thus carried out, no detectable undesirable quality-dependent structural constituents, which are detectable in the finished rolling stock, form en and with a device having the features of claim 2, characterized in that the cooling unit consists primarily of the pressure chamber of the conve
- the pressure chamber according to FIG. 6 were a convection pressure chamber between two evaporation pressure chambers and the effective heat transfer value therein with a magnitude of 100,450 kJ / m2.h. ° C was equal to that in the convection pressure chamber, the cooled rolling stock would have a cooling temperature in the order of magnitude Get 350 ° C, you would not reduce the amount of pressurized water.
- Fig. 9 shows the well-known diagram of the dependency of the heat flow density and heat transfer coefficient on the temperature difference between the heating surface and the water at the pressure of 1 bar, which is used as a representation aid, although the pressure of the pressurized water is higher in the cooling unit according to the invention, the attached ⁇ values are on the CE line.
- Fig. 10 shows the process of heat removal with evaporation in a simplified schematic representation.
- the horizontally hatched area should schematically represent the proportion of pressurized water and the dotted area the proportion of steam.
- the left side should represent the pressurized water-steam mixture ratio when the pressurized water quantity is 1-, the right side with one of 1+.
- FIG. 1 and 2 show an embodiment of a cooling unit for cooling wide flat rolled stock, e.g. Hot wide strip.
- the cooling unit consists primarily of the pressure chamber of the convection cooling part, the convection pressure chamber (1), with the storage edges (7) and (8) and secondarily from the pressure chamber of the evaporative cooling part, the evaporation pressure chamber (2), with the storage edges (9) and (10), plus the pressurized water line (3), the pressurized water valve (4), the pressurized water inflow control valve (5), the inflows (6), the lower part of the cooling unit (11), the upper part of the cooling unit (12), a seal (13) and the turbulence enhancer (15) Flow indicator (16), the laterally variable storage edges (17), the water and condensation box (19), plus the showers (20), the pressurized water / steam mixture retaining elements (21) and the water and condensate drains (22).
- the pressurized water flows from the pressurized water line (3), via the pressurized water valve (4) with approx. 80% and via the pressurized water inflow control valve (5) with approx. 20%, through the inflows (6) into the convection pressure chamber (1), is warmed up to the boiling point by the continuous, warm-rolled rolling stock, the pressurized water-steam mixture generated flows over the accumulation edges (7) and ( 8) into the evaporation pressure chambers (2), then cools the hot rolled rolling stock by removing heat, which the pressurized water-steam mixture extracts from the rolling stock as evaporation heat, and leaves the cooling unit through the accumulation edges (9) and (10).
- the damming edges (7) and (8) are arranged to make it difficult for the pressurized water to leave the convection pressure chamber (1) and to separate the process of heat removal in the two pressure rooms (1) and (2) so that the physical possibility is created to keep the extraction of heat from the hot rolled material stable by convection and evaporation (bubble and film boiling) and to be able to use it as optimally as possible.
- the steam portion of the pressurized water / steam mixture flowing out through the accumulation edges (9) and (10) is condensed on the underside between the roller table rollers with showers (20) for wide flat rolled stock and on the top by means of the pressurized water / steam mixture retaining elements (21 ), e.g. in the form of movable flaps, led into the water and condensation box (19) in the upper part (12) and condensed there with showers (20). Water and condensate flow out through the opening (22).
- FIG. 3 and 4 show an embodiment of a cooling unit for cooling section steel, e.g. I-, L-profiles, reinforcement steel, wire rod.
- a cooling unit for cooling section steel e.g. I-, L-profiles, reinforcement steel, wire rod.
- the cooling unit for this consists in the main parts of the same parts as described for the cooling unit for wide flat rolled stock, with reference to FIGS. 1 and 2.
- the cooling unit body is preferably in one piece (14), so that the pressurized water / steam mixture emerging from the accumulation edges (9) and (10) flows directly into the water and condensation box (19).
- a connector (18) is shown, with which two or more cooling units can be connected if no air should be able to reach the surface of the rolling stock during cooling in the pressurized water.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Laminated Bodies (AREA)
Description
Die Erfindung betrifft gemäß Oberbegriff von Patentanspruch 1 ein Verfahren mit Kühlaggregat zum Abkühlen walzwarmen Walzguts, mit/ohne Direktpatentieren, bei dem Druckwasser innerhalb eines Druckraums zwischen Stauränder (Verengungen im Druckwasser-Strömungsquerschnitt) auf die walzwarme Walzgutoberfläche gedrückt wird; siehe DE-A 1 608 327. Die Erfindung betrifft ausgehend vom genannten Stand der Technik auch eine Vorrichtung zur Durchführung des Verfahrens mit den Merkmalen gemäß Oberbegriff von Patentanspruch 2.The invention relates, according to the preamble of
Beim Abkühlen walzwarmen Walzguts, mit Direktpatentieren, ist ein Verfahren mit Kühlaggregat nützlich, daß einerseits das Erreichen der gewünschten Abkühltemperatur mit geringem Einsatz der Mittel ermöglicht und andererseits eine ungewollte Überkühlung der Randzone des Walzgutes, die zur Bildung unerwünschter Gefügebestandteile im Fertigwalzgut führen kann, vermeidet.When cooling hot rolled rolling stock with direct patenting, a method with a cooling unit is useful that on the one hand enables the desired cooling temperature to be reached with little use of the agents and on the other hand prevents undesired overcooling of the edge zone of the rolling stock, which can lead to the formation of undesirable structural components in the finished rolling stock.
Beim freien Abkühlen walzwarmen Walzguts, ohne Direktpatentieren, ist ein Verfahren mit Kühlaggregat nützlich, daß einerseits das Erreichen der gewünschten Abkühltemperatur mit geringem Einsatz der Mittel ermöglicht und anderereits das Erreichen des frei gewählten Gefügeprofils im Fertigwalzgut, ohne unerwünschte Gefügebestandteile, ermöglicht.For free cooling of hot rolled rolling stock, without direct patenting, a method with a cooling unit is useful, which on the one hand enables the desired cooling temperature to be reached with little use of the agent and on the other hand enables the freely selected microstructure profile in the finished rolling stock to be achieved without undesirable structural components.
Es ist bekannt, daß bei der Herstellung von Warmbreitband Stabstahl bis bin zum Walzdraht, das walzwarme Walzgut zum überviegenden Teil mit Wasser in einem oder in Intervallen abgekühlt wird, teilweise mit Wasser und anschließend mit Gebläseluft oder an Luft alleine. Bei der Abkühlung von Warmbreitband werden in der Spritzdüsen- und Laminarwasserkühlung 8000 m³/h und mehr Kühlwasser eingesetzt, andererseits wird Walzdraht mit 5,5 mm Durchmesser, von 1000° auf 650°, an dem einen Drahtwalzwerk mit 240 m³/h und am anderen mit 70 m³/h Kühlwasser abgekühlt. Diese stark voneinander abweichenden Kühlwassermengen zeigen, daß bei den herkömmlichen Abkühlungen dem walzwarmen Walzgut eine sehr unterschiedliche Wärmemenge pro m³ Kühlwasser entzogen wird.It is known that in the production of hot wide strip steel bars up to the wire rod, the hot rolled rolling stock is predominantly cooled with water in one or at intervals, partly with water and then with Blown air or air alone. When cooling hot strip, 8000 m³ / h and more cooling water are used in the spray nozzle and laminar water cooling, on the other hand wire rod with 5.5 mm diameter, from 1000 ° to 650 °, on one wire rolling mill with 240 m³ / h and the other cooled down with 70 m³ / h cooling water. These widely differing amounts of cooling water show that with conventional cooling, a very different amount of heat is extracted from the hot rolled rolling stock per m³ of cooling water.
Allen Abkühlungen walzwarmen Walzguts mit Wasser ist, bei geringer Walzgutdicke (Walzgutdurchmesser) insbesondere, gemeinsam, daß bei den zunehmenden Walzgeschwindigkeiten und den damit zunehmenden Kühlwassermengen oder den zunehmend höher gefahrenen Wärmeübergangswerten bei der Abkühlung, die Gefahr der unerwünschten Überkühlung der Walzgut-Randzone zunimmt. Um dieser Gefahr zu entgehen, vermeidet man es, z.B. bei Warmbreitband wie auch beim Walzdraht, mit der Abkühlung in der Spritzdüsen- und Laminarwasserkühlung Abkühltemperaturen zu fahren, bei denen während oder nach der Abkühlung die Walzgutrandtemperatur zu nahe an den, im qualitätsbezogenen ZTU-Schaubild ausgewiesen, Härtegefügebereich herankommt. Bei der Herstellung von Warmbreitband ist neben den metallurgischen Folgen, ein zunehmend langer Abkühlrollgang die Folge, ist dessen Längengrenze erreicht, eine höhere Haspeltemperatur. Bei der Herstellung von Walzdraht, der heute zum überviegenden Teil primär mit Wasser und sekundär ausgefächert mit Gebläseluft und an Luft abgekühlt wird, ist die Folge, daß der Walzdraht mit Temperaturen stark oberhalb des Umwandlungspunktes ausgefächert auf das Luftkühlband abgelegt werden muß. Wie groß weltweit die Schwierigkeit bei der Abkühlung von schnell laufendem Walzdraht geworden war, vermittelt ein Bericht in 
Es ist derzeit keine Veröffentlichung bekannt oder zugänglich, die die Phänomene beim Entziehen der Wärme aus geformten, heißen, durchlaufenden Produktionsgut aus Stahl oder Metall, in einem Druckraum durch Druckwasser, im einzelnen beschreibt; an Hand von Meßschrieben werden unterschiedliche Abläufe beim Entziehen der Wärme aus einem walzwarmen Walzgut in Druckwasser innerhalb verschieden langer Kühlaggregate mit nur einem Druckraum zwischen den Staurändern an den Kühlaggregatsenden und unterschiedlicher Druckwassermengen beschrieben.There is currently no known or accessible publication describing in detail the phenomena when the heat is extracted from shaped, hot, continuous production goods made of steel or metal, in a pressure chamber by pressurized water; On the basis of measuring records, different processes for extracting the heat from a hot rolled rolling stock in pressurized water are described within cooling units of different lengths with only one pressure space between the accumulation edges at the ends of the cooling unit and different amounts of pressurized water.
In den Fig. 5 bis 8 sind zum Meßschrieb an der Kühltemperatur, die Meßschriebe des Drucks in der Druckwasserleitung und die der Druckwassermengen dargestellt, sowie das Symbol für die Druckraumlänge eingetragen. Die Zahlen zur Druckraumlänge und Druckwassermenge sind Verhältniszahlen.5 to 8 are shown for the measurement record at the cooling temperature, the measurement records of the pressure in the pressurized water line and that of the pressurized water quantities, and the symbol for the pressure chamber length. The numbers for the length of the pressure chamber and the amount of pressure water are ratio numbers.
Die Meßschriebe in Fig. 5 und Fig. 7 dokumentieren, daß bei einer Druckraumlänge 1 bzw. 3 und einer gleichbleibenden Druckwasser-Menge 3 bzw. 10 der Wärmeentzug in sich instabil wurde, da das Druckraum-Volumen, bezogen auf die eingesetzte Druckwasser-Menge, zu groß war und dabei die Abkühltemperatur von 860° bzw. 780°, über die Walzgutlaufzeit, in Sägeschritten auf 720° bzw. 660° absank, wogegen sie sich in den Meßschrieben in Fig. 6 und Fig. 8 (im Bereich gleichbleibenden Wasserdrucks) als stabil und gleichbleibend zeigt. Bei der Abkühlung nach Fig. 5 und 7 stieg der Wärmeentzug in Sekunden oszillierend bis zur Vollverdampfung, bei der der Dampfdruck den Druckraum für Sekunden druckwasserfrei machte bis ebenso schnell wieder Druckwasser nachströmte und der Vorgang sich auf immer höher liegenden Wärmeübergangswert-Niveau sich wiederholte, wobei die Abkühltemperatur selbstfahrend abgesunken ist und damit das Fertigwalzgut über die Länge kein gleichmäßiges Gefüge haben konnte.The measuring records in Fig. 5 and Fig. 7 document that with a
Der Erfindung liegt die Aufgabe zugrunde, die Abkühlung walzwarmen Walzguts, vom Warmbreitband bis zum Walzdraht, mit/ohne Direktpatentieren, in Druckwasser so durchführen zu können, daß während und nach der so durchgeführten Abkühlung, sich keine nachweisbaren unerwünschten qualitätsabhängig-abkühlungsbedingten Gefügebestandteile im Fertigwalzgut bilden können und der Einsatz der Mittel vergleichsweise gering ist.The invention is based on the object of being able to carry out the cooling of hot rolled rolling stock, from hot wide strip to wire rod, with / without direct patenting, in pressurized water in such a way that during and after the cooling thus carried out, no detectable undesirable, quality-dependent, cooling-related structural components form in the finished rolling stock can and the use of funds is comparatively low.
Die Aufgabe wird erfindungsgemäß mit einem die Verfahrensschritte von Patentanspruch 1 enthaltenden Verfahren dadurch gelöst, daß das Kühlaggregat mit der Menge Druckwasser beaufschlagt wird, die kühlaggregatsbedingt notwendig ist, vorzugsweise mit der den Walzgut zu entziehenden Wärmemenge im Gleichgewicht steht, damit mit dem Wärmeentzug durch das Erwärmen des Druckwassers im Druckraum des Konvektionskühlteils, im Konvektions-Druckraum, und dem Wärmeentzug durch die an das Druckwasser-Dampf-Gemisch abgegebene Verdampfungswärme im Druckraum des Verdampfungskühlteils, im Verdampfungs-Druckraum, vorzugsweise bis an den Siedepunkt des Druckwassers, die gewünschte Abkühltemperatur des Walzguts erreicht wird und dabei die Abkühlung im Druckwasser und im Druckwasser-Dampf-Gemisch so geführt wird, daß sich, während und nach der so durchgeführten Abkühlung, keine im Fertigwalzgut nachweisbaren unerwünschten qualitätsabhängig-abkühlungsbedingte Gefügebestandteile bilden können und mit einer die Merkmale von Patentanspruch 2 aufweisenden Vorrichtung dadurch, daß das Kühlaggregat primär aus dem Druckraum des Konvektionskühlteils, dem Konvektions-Druckraum besteht, in dem dem walzwarmen Walzgut, vornehmlich durch Konvektion, vom auf die walzwarme Walzgutoberfläche gedrückten Druckwasser-Wärme, vorzugsweise bis an den Siedepunkt des Druckwassers, entzogen wird und sekundär aus dem Druckraum des Verdampfungskühlteils, dem Verdampfungs-Druckraum, in dem dem Walzgut, vornehmlich durch die Verdampfungswärme, vom auf die Walzgutoberfläche gedrückten, im Konvektions-Druckraum erzeugten, Druckwasser-Dampf-Gemisch, weiter Wärme entzogen wird.The object is achieved with a method containing the method steps of
Weitere Ausbildungen des Kühlaggregats beinhalten
- daß das Volumen des Konvektions-Druckraums so bemessen ist, daß bei durchlaufenden Walzgut dessen verbleibender Volumenteil ausreichend ist, daß die für die Abkühlung der vorgesehenen Menge Walzgut ermittelte Menge Druckwasser, die aus der Druckwasserleitung, über das Druckwasser-Ventil und das Druckwasser-Zuströmsteuerventil, durch die vorzugsweise mittig liegenden Einströmöffnungen in den Konvektions-Druckraum strömt, darin dem Walzdraht soviel Wärme entziehen kann die notwendig ist, das Druckwasser auf eine qualitätsbedingt festgesetzte Temperatur zu erwärmen,
- daß die Stauränder zwischen dem Konvektions-Druckraum und dem Verdampfungs-Druck so bemessen sind, daß bei durchlaufendem Walzgut der verbleibende Durchströmquerschnitt ausreichend ist, daß die im Kenvektions-Druckraum entstandene Druckwasser-Dampf-Gemisch-Menge in den Verdampfungs-Druckraum einströmt und darin das Walzgut durch den Wärmeentzug den das Druckwasser-Dampf-Gemisch als Verdampfungswärme dem Walzgut entzieht, abkühlt,
- daß der Durchströmquerschnitt im Staurand am Walzguteintritt und -austritt, bezogen auf den verbleibenden Durchströmquerschnitt bei durchlaufendem Walzgut, in seinem Maß von der Walzgutoberfläche bis zum Staurand gleich oder 10 bis 30% größer oder geringer ist als dasselbe Maß bei den der verbleibenden Durchströmquerschnitte in den Staurändern innerhalb des Kühlaggregats, womit erreicht ist, daß die Abkühlintensität des Kühlaggregats den Notwendigkeiten der unterschiedlichen Qualitätsgruppen und Abkühltemperaturen des abzukühlenden Walzguts angepaßt werden kann,
- daß der Kühlaggregats-Körper in ein Unterteil und in ein Oberteil geteilt ist und beide Teile seitlich vorzugsweise eine Labyrinthdichtung angeordnet haben und das Oberteil abstandvariabel und kraftschlüssig geführt ist,
- daß der Kühlaggregats-Körper ungeteilt ausgeführt ,
- daß im Konvektions-Druckraum und/oder im Verdampfungs-Druckraum-Turbulenzerhöher und/oder Strömungsweise angeordnet sind,
daß der Konvektions-Druckraum vorzugsweise zwischen zwei Verdampfungs-Druckräume angeordnet ist, die alle gleiche oder unterschiedliche Länge haben, - daß der Konvektions-Druckraum nach oder vor dem Verdampfungs-Druckraum angeordnet ist,
- daß das Druckwasser-Ventil und das Druckwasser-Zuströmsteuerventil in eins zusammengefaßt sind,
- daß die Regelung der Abkühlintensität während des Durchlaufs des Walzguts mit dem Druckwasser-Zuströmsteuerventil, durch Verändern der Druckwassermenge, erfolgt,
- daß die Regelung der Abkühlintensität während des Durchlaufs des Walzgutes, bei geteilten Kühlaggregats-Körper, auch über abstandsvariable, kraftschlüssige Führung des Oberteils erfolgt,
- daß bei Veränderung der Walzgutbreite, im Konvektions-Druckraum, ggf. auch im Verdampfungs-Druckraum, seitlichvariabel fixierbare Stauränder an den Seiten angeordnet sind,
- daß bei geteilten Kühlaggregats-Körper das Kühlaggregat von seinem geöffneten Zustand über den des Zusammenfahrens des Oberteils auf das Unterteil und dem dabei aufgeschalteten Druckwasser, stufenlos von der offenen Spritzwasser-Abkühlung zur geschlossenen Druckwasser-Abkühlung führbar ist,
- daß dem Druckwasser feine Sande, z.B. schmiergelnde, beigegeben sind,
- daß dem Druckwasser chemisch wirkende Zusätze, z.B. zur Unterstützung einer bestimmten Zunderbildung, zur Neutralisation, beigegeben sind,
- daß dem Druckwasser Luft zugegeben wird,
- daß zum Vermeiden des Luftzutritts, während der Abkühlung in Druckwasser, zwei oder mehr Kühlaggregate mit je einem Verbindungsstück verbunden sind,
- daß das Kühlaggregat an einen Wasser- und Kondensationskasten angeschlossen ist, selbst einen hat oder in einem liegt, der vorzugsweise mit Brausen ausgerüstet ist und ggf. an der Walzgut-Einlauf- und Auslaufseite je ein Druckwasser-Dampf-Gemisch-Rückhalteelement angeordnet trägt und Ablauföffnungen hat und
- daß das Kühlaggregat mit seinem festverbundenen Wasser- und Kondensationskasten vorzugsweise doppelt und parallel angeordnet ist, wobei wechselweise das eine oder andere Kühlaggregat, durch einfache Mechanik, in kürzester Zeit aus und in die Walzgutlinie gerückt wird.
- that the volume of the convection pressure chamber is dimensioned such that when the rolling stock passes through, the remaining part of its volume is sufficient for the quantity of pressurized water determined for cooling the intended amount of rolled material, that from the pressurized water line, via the pressurized water valve and the pressurized water inflow control valve, flows through the preferably central inflow openings into the convection pressure chamber, extracting as much heat from the wire rod as is necessary to heat the pressurized water to a temperature determined by quality,
- that the accumulation edges between the convection pressure chamber and the evaporation pressure are dimensioned such that when the rolling stock passes through, the remaining flow cross-section is sufficient for the quantity of pressurized water / steam mixture produced in the convection pressure chamber to flow into the evaporation pressure chamber and therein Rolled stock cools down due to the heat removal that the pressurized water / steam mixture extracts from the rolled stock as heat of vaporization,
- that the flow cross-section in the accumulation edge at the rolling stock entry and exit, based on the remaining flow cross-section when rolling stock is in transit, is equal in its dimension from the rolling stock surface to the accumulation edge or is 10 to 30% larger or smaller than the same dimension for that of the remaining flow cross-sections in the accumulation edges within the cooling unit, which means that the cooling intensity of the cooling unit can be adapted to the needs of the different quality groups and cooling temperatures of the rolling stock to be cooled,
- that the cooling unit body is divided into a lower part and an upper part and both parts preferably have a labyrinth seal on the side and the upper part is variable and non-positively guided,
- that the cooling unit body is undivided,
- that are arranged in the convection pressure chamber and / or in the evaporation pressure chamber turbulence enhancer and / or flow mode,
that the convection pressure space is preferably arranged between two evaporation pressure spaces, all of which have the same or different lengths, - that the convection pressure chamber is arranged after or before the evaporation pressure chamber,
- that the pressurized water valve and the pressurized water inflow control valve are combined in one,
- that the regulation of the cooling intensity during the passage of the rolling stock with the pressurized water inflow control valve takes place by changing the amount of pressurized water,
- that the regulation of the cooling intensity during the passage of the rolling stock, in the case of a divided cooling unit body, also takes place via distance-variable, non-positive guidance of the upper part,
- that when the width of the rolling stock changes, in the convection pressure space, possibly also in the evaporation pressure space, the sides of the variable-variable retention edges are arranged on the sides,
- that in the case of a divided cooling unit body, the cooling unit can be steplessly guided from the open spray water cooling to the closed pressure water cooling, from its open state to that of the moving together of the upper part onto the lower part and the pressurized water which is thereby switched on,
- that fine sands, e.g. lubricating gels, are added to the pressurized water,
- that chemically active additives are added to the pressurized water, e.g. to support a certain scale formation, for neutralization,
- that air is added to the pressurized water,
- that two or more cooling units are each connected to a connecting piece in order to avoid air access during cooling in pressurized water,
- that the cooling unit is connected to a water and condensation box, itself has or is in one, which is preferably equipped with showers and, if appropriate, carries a pressure water / steam mixture retaining element each on the rolling stock inlet and outlet side and has drain openings has and
- that the cooling unit with its firmly connected water and condensation box is preferably arranged twice and in parallel, alternately one or the other cooling unit is moved out of and into the rolling stock line in a very short time by simple mechanics.
Die mit dem erfindungsgemäße Verfahren mit Kühlaggregat erzielten Vorteile bestehen insbesondere darin,
- daß das walzwarme Walzgut geführt in Druckwasser abgekühlt wird, dadurch nur eine vergleichsweise geringe Druckwassermenge benötigt wird,
- daß sich während und nach der so durchgeführten Abkühlung, mit/ohne Direktpatentierung, im Gefüge des Fertigwalzgutes keine nachweisebaren, unerwünschten qualitätsabhängig-abkühlungsbedingte Gefügebestandteile bilden können,
- daß diese physikalisch sicher führbare Abkühlung walzwarmen Walzguts im Produktionsfluß einerseits das Direktpatentieren in Druckwasser bei einem großen Teil der Walzgutqualitäten ermöglicht, andererseits das Direktpatentieren zu einem großen Teil schon vor dem anschließenden Direktpatentieren in Gebläseluft zuläßt und außerdem jede freie Abkühlung zum Erreichen der unterschiedlichen Oberflächengefügeausbildungen möglich macht,
- daß mit der Zugabe von geeigneten Stoffen zum Druckwasser es möglich ist die Walzgutoberfläche bei der Abkühlung zusätzlich physikalisch und/oder chemisch zu behandeln,
- daß das Verfahren so durchführbar und das Kühlaggregat so einstellbar ist, daß gegenüber der herkömmlich eingesetzten Kühleinrichtungen und
Kühlverfahren mehr als 50%-80% Druckwasser eingespart wird.
- that the hot rolled rolling stock is cooled in pressurized water, so that only a comparatively small amount of pressurized water is required,
- that during and after the cooling thus carried out, with / without direct patenting, no detectable, undesirable, quality-dependent, cooling-related structural components can form in the structure of the finished rolling stock,
- that this physically safe cooling of hot rolled rolling stock in the production flow enables direct patenting in pressurized water for a large part of the rolling stock qualities, on the other hand allows direct patenting to a large extent even before the subsequent direct patenting in blown air and also enables any free cooling to achieve the different surface structure designs ,
- that with the addition of suitable substances to the pressurized water it is possible to additionally treat the surface of the rolling stock physically and / or chemically during cooling,
- that the process can be carried out and the cooling unit can be set such that more than 50% -80% pressurized water is saved compared to the conventionally used cooling devices and cooling processes.
Läge der Druckraum nach Fig. 6 als Konvektions-Druckraum zwischen zwei Verdampfungs-Druckräume und wäre der darin wirksame Wärmeübergangswert mit einer Größenordnung von 100.450 kJ/m².h.°C gleich dem im Konvektions-Druckraum, würde das abgekühlte Walzgut größenordnungsmäßig eine Abkühltemperatur um 350°C bekommen, würde man die Druckwassermenge nicht zurückfahren.If the pressure chamber according to FIG. 6 were a convection pressure chamber between two evaporation pressure chambers and the effective heat transfer value therein with a magnitude of 100,450 kJ / m².h. ° C was equal to that in the convection pressure chamber, the cooled rolling stock would have a cooling temperature in the order of magnitude Get 350 ° C, you would not reduce the amount of pressurized water.
Fig. 9 zeigt das allgemein bekannte Diagramm der Abhängigkeit der Wärmestromdichte und Wärmeübergangszahl von der Temperaturdifferenz zwischen der Heizfläche und dem Wasser bei dem Druck von 1 bar, das als Darstellungshilfe herangezogen wird, obwohl im erfindungsgemäßen Kühlaggregat der Druck des Druckwassers höher ist, dürften die anliegenden α-Werte auf der Linie C-E liegen.Fig. 9 shows the well-known diagram of the dependency of the heat flow density and heat transfer coefficient on the temperature difference between the heating surface and the water at the pressure of 1 bar, which is used as a representation aid, although the pressure of the pressurized water is higher in the cooling unit according to the invention, the attached α values are on the CE line.
Fig. 10 zeigt den Ablauf des Wärmeentzugs mit Verdampfung in vereinfachter schematischer Darstellung. Die waagerecht schraffierte Fläche soll den Druckwasser-Anteil und die gepunktete Fläche den Dampf-Anteil schematisch darstellen. Die linke Seite soll das Druckwasser-Dampf-Gemisch-Verhältnis bei einer Beaufschlagung mit einer Druckwasser-Menge von 1-, die rechte Seite mit einer von 1+ darstellen.Fig. 10 shows the process of heat removal with evaporation in a simplified schematic representation. The horizontally hatched area should schematically represent the proportion of pressurized water and the dotted area the proportion of steam. The left side should represent the pressurized water-steam mixture ratio when the pressurized water quantity is 1-, the right side with one of 1+.
Die rechnerische Ermittlung der genauen Menge Druckwasser für die Abkühlung der verschiedenen Walzgutqualitäten und -abmessungen auf die unterschiedlichen Abkühltemperaturen ist, wegen der Vielzahl der dabei wirksamen bekannten und unbekannten Imponderabilien (wie u.a. die Zunder-Dicke, -Haftung und -Deckungs % pro cm² Walzgutoberfläche) kaum möglich, wogegen es einfach ist die Druckwasser-Menge zu den einzelnen Abkühltemperaturen durch Meßfahrten zu ermitteln, was erfahrungsgemäß im Produktionslauf erfolgen kann, da die Hauptwerte an einfachsten Qualitäten gefahren werden können. Von der vergleichsweise geringen Menge Druckwasser sollen als Grundlast-Menge etwa 80% über das Druckwasser-Ventil und die restliche Menge von 20% über das regelbare Druckwasser-Zuströmventil in das Kühlaggregat einströmen, womit es möglich wird, daß die momentan notwendig einzuströmende Menge Druckwasser, zum Heranführen der momentan anliegenden Ist-Abkühltemperatur an die Soll-Abkühltemperatur, in sehr kurzer Zeit erreicht ist, so daß die Soll-Abkühltemperatur mit minimaler Bandbreite gefahren werden kann.The mathematical determination of the exact amount of pressurized water for the cooling of the different rolling stock qualities and dimensions to the different cooling temperatures is due to the large number of known and unknown imponderables effective (such as the scale thickness, adhesion and coverage% per cm² of rolling stock surface) hardly possible, whereas it is easy to determine the amount of pressurized water at the individual cooling temperatures by measuring runs, which experience has shown that it can be carried out in the production run, since the main values can be measured in the simplest qualities. Of the comparatively small amount of pressurized water, about 80% should flow into the cooling unit as the base load amount via the pressurized water valve and the remaining amount of 20% via the controllable pressurized water inflow valve, which makes it possible for the amount of pressurized water currently required to flow in, to bring the actual cooling temperature currently present to the target cooling temperature is reached in a very short time, so that the target cooling temperature can be operated with a minimal bandwidth.
Zwei Ausführungsbeispiele des erfindungsgemäßen Kühlaggregats und Verfahrens sind in der Zeichnung schematisch dargestellt und werden im folgenden näher beschrieben.Two exemplary embodiments of the cooling unit and method according to the invention are shown schematically in the drawing and are described in more detail below.
Fig. 1 und 2 zeigen ein Ausführungsbeispiel eines Kühlaggregats für die Abkühlung breiten Flachwalzguts, z.B. Warmbreitband.1 and 2 show an embodiment of a cooling unit for cooling wide flat rolled stock, e.g. Hot wide strip.
Das Kühlaggregat besteht primär aus dem Druckraum des Konvektionskühlteils, dem Konvektions-Druckraum (1), mit den Staurändern (7) und (8) und sekundär aus dem Druckraum des Verdampfungskühlteils, dem Verdampfungs-Druckraum (2), mit den Staurändern (9) und (10), dazu die Druckwasser-Leitung (3), das Druckwasser-Ventil (4), das Druckwasser-Zuströmsteuerventil (5), die Einströmungen (6), dem Kühlaggregat-Unterteil (11), dem Kühlaggregat-Oberteil (12), einer Dichtung (13) dazu die Turbulenzerhöher (15) die Strömungsweiser (16), die seitlichvariablen Stauränder (17), dem Wasser- und Kondensationskasten (19), dazu die Brausen (20), die Druckwasser-Dampf-Gemisch-Rückhalteelemente (21) und die Wasser- und Kondensatabflüsse (22).The cooling unit consists primarily of the pressure chamber of the convection cooling part, the convection pressure chamber (1), with the storage edges (7) and (8) and secondarily from the pressure chamber of the evaporative cooling part, the evaporation pressure chamber (2), with the storage edges (9) and (10), plus the pressurized water line (3), the pressurized water valve (4), the pressurized water inflow control valve (5), the inflows (6), the lower part of the cooling unit (11), the upper part of the cooling unit (12), a seal (13) and the turbulence enhancer (15) Flow indicator (16), the laterally variable storage edges (17), the water and condensation box (19), plus the showers (20), the pressurized water / steam mixture retaining elements (21) and the water and condensate drains (22).
Das Druckwasser strömt aus der Druckwasser-Leitung (3), über das Druckwasser-Ventil (4) mit rd. 80 % und über das Druckwasser-Zuströmsteuerventil (5) mit rd. 20%, durch die Einströmungen (6) in den Konvektions-Druckraum (1) ein, wird darin durch das durchlaufende, walzwarme Walzgut bis an den Siedepunkt erwärmt, das dabei erzeugte Druckwasser-Dampf-Gemisch strömt über die Stauränder (7) und (8) in die Verdampfungs-Druckräume (2) ein, kühlt dann das walzwarme Walzgut durch den Wärmeentzug, den das Druckwasser-Dampf-Gemisch als Verdampfungswärme dem Walzgut entzieht, ab und verläßt das Kühlaggregat durch die Stauränder (9) und (10).The pressurized water flows from the pressurized water line (3), via the pressurized water valve (4) with approx. 80% and via the pressurized water inflow control valve (5) with approx. 20%, through the inflows (6) into the convection pressure chamber (1), is warmed up to the boiling point by the continuous, warm-rolled rolling stock, the pressurized water-steam mixture generated flows over the accumulation edges (7) and ( 8) into the evaporation pressure chambers (2), then cools the hot rolled rolling stock by removing heat, which the pressurized water-steam mixture extracts from the rolling stock as evaporation heat, and leaves the cooling unit through the accumulation edges (9) and (10).
Die Stauränder (7) und (8) sind angeordnet um dem Druckwasser das Verlassen des Konvektions-Druckraums (1) zu erschweren und den Vorgang des Wärmeentzugs in den beiden Druckräumen (1) und (2) so zu trennen, daß damit die physikalische Möglichkeit geschaffen ist, den Entzug der Wärme aus dem walzwarmen Walzgut durch Konvektion und Verdampfung (Blasen- und Filmsieden) stabil halten und möglichst optimal nutzen zu können.The damming edges (7) and (8) are arranged to make it difficult for the pressurized water to leave the convection pressure chamber (1) and to separate the process of heat removal in the two pressure rooms (1) and (2) so that the physical possibility is created to keep the extraction of heat from the hot rolled material stable by convection and evaporation (bubble and film boiling) and to be able to use it as optimally as possible.
Der Dampfteil des durch die Stauränder (9) und (10) ausströmenden Druckwasser-Dampf-Gemisches wird bei breitem Flachwalzgut an der Unterseite zwischen den Rollgangsrollen mit Brausen (20) kondensiert und an der Oberseite mittels der Druckwasser-Dampf-Gemisch-Rückhalteelemente (21), z.B. in Form beweglicher Klappen, in den Wasser- und Kondensationskasten (19) im Oberteil (12) geführt und dort mit Brausen (20) kondensiert. Durch die Öffnung (22) fließen Wasser und Kondensat ab.The steam portion of the pressurized water / steam mixture flowing out through the accumulation edges (9) and (10) is condensed on the underside between the roller table rollers with showers (20) for wide flat rolled stock and on the top by means of the pressurized water / steam mixture retaining elements (21 ), e.g. in the form of movable flaps, led into the water and condensation box (19) in the upper part (12) and condensed there with showers (20). Water and condensate flow out through the opening (22).
Fig. 3 und 4 zeigen ein Ausführungsbeispiel eines Kühlaggregats für die Abkühlung von Profilstahl, z.B. I-, L-Profile, Betonbewehrungsstahl, Walzdraht.3 and 4 show an embodiment of a cooling unit for cooling section steel, e.g. I-, L-profiles, reinforcement steel, wire rod.
Das Kühlaggregat dafür besteht in den Hauptteilen aus den gleichen Teilen wie sie beim Kühlaggregat für breites Flachwalzgut, zu Fig. 1 und 2 beschrieben sind. Der Kühlaggregats-Körper ist dafür jedoch vorzugsweise einteilig (14), wodurch das aus den Staurändern (9) und (10) austretende Druckwasser-Dampf-Gemisch direkt in den Wasser- und Kondensationskasten (19) strömt.The cooling unit for this consists in the main parts of the same parts as described for the cooling unit for wide flat rolled stock, with reference to FIGS. 1 and 2. The cooling unit body, however, is preferably in one piece (14), so that the pressurized water / steam mixture emerging from the accumulation edges (9) and (10) flows directly into the water and condensation box (19).
In Fig. 4 ist ein Verbindungsstück (18) dargestellt, mit dem zwei oder mehr Kühlaggregate verbunden werden können, falls während der Abkühlung im Druckwasser keine Luft an die Walzgutoberfläche gelangen können soll.In Fig. 4, a connector (18) is shown, with which two or more cooling units can be connected if no air should be able to reach the surface of the rolling stock during cooling in the pressurized water.
Fig. 11 zeigt die Abkühllinien bei der Abkühlung eines Walzdrahts mit 5,5 mm Durchmesser, bei einer Endwalzgeschwindigkeit von 80 m/s und einer eingesetzten Druckwassermenge von 20 m³/h.
- in einem Kühlaggregat, analog Fig. 5 mit nur einem Druckraum
mit der Länge 1, bei der der Wärmeentzug pro dm³ Druckwasser 83 kcal beträgt und der Walzdraht dabei auf 795°C abkühlt und - in einem Kühlaggregat, analog Fig.10, mit einem Konvektions-Druckraum
mit der Länge 1 und zwei anschließende Verdampfungs-Druckräume mit je der Länge 0,5, bei der der Wärmeentzug pro dm³ Druckwasser 828,729 kJ beträgt und der Walzdraht dabei auf 506°C abkühlt, eine Temperatur die schon unter der bei Betonbewehrungsstählen mit walzhitzevergüteter Oberfläche gefahrenen liegt. Das mit drei Druckräumen ausgestattete Kühlaggregat kühlt den Walzdraht mit rd. 7,5 m³/h auf 795°C - das sind rd. 60% Einsparung an Druckwasser, womit die Wirtschaftlichkeit des erfindungsgemäßen Kühlaggregats und Verfahrens besonders unter Beweis gestellt ist.
- 5 with only one pressure chamber with
length 1, in which the heat removal per dm³ of pressurized water is 83 kcal and the wire rod cools down to 795 ° C. and - in a cooling unit, analogous to Fig. 10, with a convection pressure chamber with a length of 1 and two subsequent evaporation pressure rooms with a length of 0.5, in which the heat removal per dm³ of pressurized water is 828.729 kJ and the wire rod to 506 ° C cools down, a temperature that is already lower than that used for concrete reinforcement steels with a heat-treated surface. The cooling unit equipped with three pressure rooms cools the wire rod with approx. 7.5 m³ / h at 795 ° C - that's approx. 60% savings in pressurized water, which particularly proves the economic viability of the cooling unit and method according to the invention.
Claims (21)
- Method for cooling hot-rolled rolling stock, with/without direct patenting in presswater, at which presswater within a pressure-chamber (1) between constrictions (7 and 8) is pressed to the hot-rolled surface of the rolling stock
characterized in
that the cooling-apparatus is filled with a quantity of presswater, which is preferably in balance with the heat to be abstracted, in order to achieve the desired cooling temperature of the rolled product through the heat abstraction by heating of the presswater in the pressure-chamber of a convection-cooling-part and the heat abstraction through the evaporation heat released to a presswater-steam-mixture in the pressure-chamber of an evaporation-cooling-part (2), preferably up to the boiling point of the presswater, and while doing so the cooling rate in the presswater and the presswater-steam-mixture is controllable. - Cooling-apparatus for the performance of the method according to claim 1 for the cooling of hot-rolled rolling stock, with/without direct patenting, at which presswater is pressed within a pressure-chamber (1) between the constrictions (7 and 8) to the hot-rolled surface of the rolling stock,
characterized in
that the cooling-apparatus (1) consists of the pressure-chamber of a convection-cooling-part, the convection-pressure-part (1) between the constrictions (3 and 8), in which heat is abstracted from the hot-rolled rolling stock, in particular by convection, by the inflowing presswater, which is pressed down on to the hot-rolled surface of the rolling stock, preferably up to the boiling point of the presswater, and out of the pressure-chamber of an evaporation-cooling-part, the evaporation-pressure-chamber (2) between the constrictions (7, 9; 8, 10), in which further heat from the rolling stock in particular by the evaporation heat is abstracted by the inflowing mixture of water and steam, which is pressed on to the surface of the rolling and which is produced in the convection-pressure-chamber. - Cooling-apparatus according to claim 2,
characterized in
that the volume of the convection-pressure-chamber (1) is designed such so that its remaining volume, when a rolling stock is passing through, is sufficient so that the quantity of presswater, determined for the cooling of the designated quantity of rolling stock, which is flowing in from a presswater-pipe through a presswater-valve (4) and a presswater-inflow-control-valve (5) through the preferably centrically provided inlet (6) into the convection-pressure-chamber, can abstract from the rolling stock so much heat as is necessary, to heat the presswater to a quality-determined fixed temperature. - Cooling-apparatus according to claim 2 and 3,
characterized in
that the constrictions (7 and 8) between the convection-pressure-chamber (1) and the evaporation-pressure-chamber (2) are designed in such a way that during passing through of rolling stock the remaining flow-through-cross-section is sufficient that the quantity of presswater-steam-mixture, developed in the convection-pressure-chamber, flows into the evaporation-pressure-chamber and cools therein the rolling stock through the heat abstraction, which the presswater-steam-mixture as evaporation heat abstracts from the rolling stock. - Cooling-apparatus according to claim 2 through 4,
characterized in
that the flow-through-cross-section in the constrictions at the entrance point of the rolling stock (9) and the exit point of the rolling stock (10) in relation to the remaining cross-section during moving through of rolling stock in its size from the rolling stock's surface up to the constrictions (9) and (10) is equal or 10% to 30% bigger or smaller than the same size at the remaining flow-through-cross-sections in the constrictions (7) and (8) within the cooling-apparatus, whereby it is achieved that the cooling intensity of the cooling-apparatus can be adapted to the necessities of the different quality groups and cooling temperatures of the rolling stock to be cooled. - Cooling-apparatus according to claim 2 through 5,
characterized in
that the cooling-apparatus is divided into a lower part (11) and an upper part (12) and both parts are provided with a seal at the side (13) and the upper part is directed at variable distances and in a fixed pattern [kraftschlüßig]. - Cooling-apparatus according to claim 2 through 6,
characterized in
that the body of the cooling-apparatus is designed in an undivided manner (14). - Cooling-apparatus according to claim 2 through 7,
characterized in
that in the convection-pressure-chamber (1) and/or in the evaporation-pressure-chamber (2) turbulence-increasers (15) and/or flow-directing-devices (16) are located. - Cooling-apparatus according to claim 2 through 8,
characterized in
that the convection-pressure-chamber (1) is located between two evaporation-pressure-chambers (2), which all have the same or different length. - Cooling-apparatus according to claim 2 through 9,
characterized in
that the convection-pressure-chamber (1) is located behind or in front of the evaporation-pressure-chamber (2). - Cooling-apparatus according to claim 2 through 10,
characterized in
that the presswater-valve (4) and the presswater-inflow-control-valve (5) are combined in one (5). - Cooling-apparatus according to claim 2 through 11,
characterized in
that the control of the cooling intensity in the course of passing through of rolling stock is made with the presswater-inflow-control-valve (5) by alteration of the quantity of the presswater. - Cooling-apparatus according to claim 2 through 12,
characterized in
that the adjustment of the intensity of the cooling in the course of passing through of rolling stock, with divided cooling-aggregate-bodies (11, 12), also is made through the control of the upper part at variable distances and in a fixed pattern [kraftschlüßig] (12). - Cooling-apparatus according to claim 2 through 13,
characterized in
that with variation of the width of the rolling stock in the convection-pressure-chamber (1), and if necessary as well in the evaporation-pressure-chamber (2), lateral-variable, fixable constrictions (17) are located on both sides. - Cooling-apparatus according to claim 2 through 14,
characterized in
that with divided cooling-apparatus-bodies (11, 12) the cooling-apparatus from its opened status until the lowering of the upper part (12) to the lower part (11) and the hereby admitted presswater is continuously adjustable from the open spray-water-cooling to the closed presswater-cooling. - Cooling-apparatus according to claim 2 through 15,
characterized in
that fine sands, i.e. abrasive sands, are added to the presswater. - Cooling-apparatus according to claim 2 through 16,
characterized in
that chemical additives, for example for support of the development of a special scale, for neutralization are added to the presswater. - Cooling-apparatus according to claim 2 through 17,
characterized in
that air is added to the presswater. - Cooling-apparatus according to claim 2 through 18,
characterized in
that for avoidance of air admission during the cooling in presswater two or more cooling apparatus are linked by a connecting piece (18) each. - Cooling-apparatus according to claim 2 through 19,
characterized in
that the cooling-apparatus is connected to a water-box or condensation-box (19), has one itself or is arranged within one, which preferably is equipped with sprinklers (22) and which has, if necessary, at both the rolling stock's entrance side and the rolling stock's outlet side a presswater-steam-retaining-device (21) assembled and has outflow outlets (22). - Cooling-apparatus according to claim 2 through 19,
characterized in
that the cooling-apparatus with its firmly attached water- and condensation-box is arranged preferably double and parallel, whereby alternatively the one or the other cooling-apparatus by simple mechanical movement, is pushed out or into the rolling line in the shortest time.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863626741 DE3626741A1 (en) | 1986-08-07 | 1986-08-07 | COOLING UNIT AND METHOD FOR COOLING WARM ROLLING, WITH / WITHOUT DIRECT PATENTING, IN PRESSURE COOLING WATER |
| DE3626741 | 1986-08-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0266302A1 EP0266302A1 (en) | 1988-05-04 |
| EP0266302B1 true EP0266302B1 (en) | 1993-09-29 |
Family
ID=6306869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87710010A Expired - Lifetime EP0266302B1 (en) | 1986-08-07 | 1987-08-07 | Cooling aggregate and method for cooling hotrolled rolling stock with/without direct patenting in presswater |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0266302B1 (en) |
| AT (1) | AT390273B (en) |
| DE (2) | DE3626741A1 (en) |
| ES (1) | ES2046213T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19718530A1 (en) * | 1997-05-02 | 1998-11-12 | Schloemann Siemag Ag | Process and cooling unit for cooling hot rolled rolling stock, in particular hot wide strip |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3708128A1 (en) * | 1987-03-13 | 1988-09-22 | Krenn Walter | PROCESS AND PRESSURE COOLING UNIT FOR LEADED COOLING SHAPED, HEAVY TO LIGHT, HOT, CONTINUOUS PRODUCTS OF STEEL AND METAL IN PRESSURE WATER |
| DE4009228A1 (en) * | 1990-03-22 | 1991-09-26 | Krenn Walter | Differential cooling system for profiled metal prods. e.g. rails - has controlled flows of pressurised water, some mixed with air, directed at different parts of prod. |
| DE4201295A1 (en) * | 1992-01-15 | 1993-07-22 | Thaelmann Schwermaschbau Veb | Device for guiding and cooling rolled material in wire rolling blocks - uses pressure water feed arranged on guide by flanges, water quantity is adjusted by diaphragm in feed nozzle |
| DE19850739A1 (en) * | 1998-11-04 | 2000-05-11 | Schloemann Siemag Ag | Method and device for cooling hot rolled material, in particular hot wide strip |
| CN104550275B (en) * | 2014-12-26 | 2016-07-06 | 钢铁研究总院 | A kind of spray vaporization chiller for hot-rolled high-strength reinforcing bar and method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1925416C3 (en) * | 1968-03-12 | 1979-08-02 | Walter 4330 Muelheim Krenn | Cooling section for wire rod or rod material |
| DE1608327C3 (en) * | 1968-03-12 | 1973-10-31 | Walter 4330 Muelheim Krenn | Cooling section for wire rod or rod material |
| DE3043117A1 (en) * | 1968-03-12 | 1982-07-01 | Walter 4330 Mülheim Krenn | Rolled prod. cooling line - comprising cooling pipes of cross=section similar to prod. cross=section |
| DD110774A1 (en) * | 1974-04-10 | 1975-01-12 | ||
| JPS5329212A (en) * | 1976-08-31 | 1978-03-18 | Showa Electric Wire & Cable Co Ltd | Cooling pipe for wire rod |
-
1986
- 1986-08-07 DE DE19863626741 patent/DE3626741A1/en not_active Withdrawn
-
1987
- 1987-07-30 AT AT0192987A patent/AT390273B/en not_active IP Right Cessation
- 1987-08-07 DE DE87710010T patent/DE3787612D1/en not_active Expired - Fee Related
- 1987-08-07 EP EP87710010A patent/EP0266302B1/en not_active Expired - Lifetime
- 1987-08-07 ES ES198787710010T patent/ES2046213T3/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19718530A1 (en) * | 1997-05-02 | 1998-11-12 | Schloemann Siemag Ag | Process and cooling unit for cooling hot rolled rolling stock, in particular hot wide strip |
| DE19718530B4 (en) * | 1997-05-02 | 2005-02-03 | Sms Demag Ag | Process for cooling of rolling-cold rolling stock and apparatus for carrying out the method and use of the apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| AT390273B (en) | 1990-04-10 |
| DE3626741A1 (en) | 1988-02-18 |
| EP0266302A1 (en) | 1988-05-04 |
| ATA192987A (en) | 1989-09-15 |
| ES2046213T3 (en) | 1994-02-01 |
| DE3787612D1 (en) | 1993-11-04 |
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