EP0287503A2 - Method of and pressure cooling apparatus for cooling a continuous product - Google Patents

Method of and pressure cooling apparatus for cooling a continuous product Download PDF

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Publication number
EP0287503A2
EP0287503A2 EP19880730063 EP88730063A EP0287503A2 EP 0287503 A2 EP0287503 A2 EP 0287503A2 EP 19880730063 EP19880730063 EP 19880730063 EP 88730063 A EP88730063 A EP 88730063A EP 0287503 A2 EP0287503 A2 EP 0287503A2
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Prior art keywords
pressure
cooling
water
cooling unit
characterized
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EP19880730063
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German (de)
French (fr)
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EP0287503B1 (en
EP0287503A3 (en
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Walter Dipl.-Ing. Krenn
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Korf Engineering GmbH
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices 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
    • B21B45/0203Cooling
    • B21B45/0209Cooling devices, e.g. using gaseous coolants
    • B21B45/0215Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0224Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62Quenching devices
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54Furnaces for treating strips or wire
    • C21D9/56Continuous furnaces for strip or wire
    • C21D9/573Continuous furnaces for strip or wire with cooling

Abstract

The method described uses a pressure cooling apparatus for the guided cooling of shaped, heavy to light, hot continuous production material of steel and metal in pressurised water. In the method, use is made of one or more pressure chambers, the volume of which can be specified in accordance with production requirements. The volume is in each case delimited by two sharp-edged orifices or constrictions which form the latter. At least one cooling, one guiding and/or one condensation inlet for pressurised water is provided for each pressure chamber. The material to be cooled is subjected to a quantity of pressurised water which is necessary to remove heat from the production material, the pressurised water for cooling which flows into the pressure cooling apparatus - into the convection cooling part - being heated in the said part, together with the pressurised water for guiding, which flows in next to the cooling water, preferably to the boiling point. In the directly adjoining evaporation cooling part, the resulting hot water/steam mixture removes further heat from the production material by virtue of the required heat of evaporation from the hot water/steam mixture. The feed lines carrying pressurised water for cooling and condensation to the pressure cooling apparatus are dimensioned in such a way that the pressure losses in them are small, for which purpose flow-controllable valves with actuators are arranged in the feed lines concerned. <IMAGE>

Description



  • The invention relates to a method and pressure cooling unit for guided cooling shaped, heavy to light, hot, continuous production goods made of steel and metal in pressurized water.
  • The cooling of shaped, hot, continuous production goods has a significant influence on the quality and the production cost of finished products made of steel and metal. To increase the amount of production per unit time of continuous casting, strip casting, rolling stock and the like, by increasing the finished product weight / m and by increasing the production throughput speed in the shaping and shaping, it is useful to use a method and cooling unit that enables the Cooling meets the diverse requirements with regard to the quality of the finished product, the intensity of the heat removal, the time period of the heat removal, the range of the desired cooling temperature, the reproducible accuracy of the target cooling temperature line according to the ZTU diagram and the economy. In the last few years, the final rolling speed in the production of hot wide strip has increased 2.5 times, the coil weight to 45 t and the capacity to 6 million t / year, with wire rod, the final rolling speed has increased to 120 m / s, the coil weight to 3000 kg and the monthly production to 30,000 t / rolling rod (Mommertz, KH: Stahl u. Eisen 106 (1968) No. 6, pp. 255/62).
  • The cooling of shaped, hot, continuous production goods made of steel or metal takes place essentially by immersing in or passing through water basins, with spray water, with spray water and blown air, in air and since 1983 for wire rod and steel bars also in pressurized water within pressure cooling pipes with narrowed pipe ends ( Krenn, W .: DP 16 08 327 and 19 25 416; Schifferl, HA, Eggerth, K. and Nöstelthaller, K .: Berg- und Hüttenmännchen Monthly Notebooks, Volume 131, (1986), Issue 11, pp. 415/21 ; Limper, HG. And Hoffmann, G .: Stahl and Eisen 105 (1985) No. 11, pp. 631/37). The application for the grant of the patent of August 3, 1986 (Krenn, W .: P 36 26 741.4, ANR. 3 058 565) describes a pressure cooling unit with two or three pressure spaces between the storage edges, in which the rolling stock passes through in a convection pressure space heating the Pressurized water is withdrawn to the boiling point and further heat is withdrawn in the subsequent evaporation pressure chamber by the evaporation heat by the hot water-steam mixture, the heat extraction being conducted via the pressurized water flowing into the convection pressure chamber .
  • When critically examining the cooling of shaped, hot, continuous production goods made of steel and metal, it must be considered how the throughput speeds, which are common in m / s, represent a surface length section of 1 mm, which is still large for cooling, since that forming steam nuclei have a diameter which is only a fraction of them.
    Figure imgb0001
    This extremely short time, s / mm, makes it clear that the intensity of the heat removal when a water particle strikes, during spray and laminar water cooling, on a continuous flow of only 15 m / s. Product surface and unpressurized environment can only be very small, which is why all cooling with spray and laminar water requires the use of very high amounts of cooling water and in various areas of application have already reached their limit of effectiveness and economy or it increases due to increasing product weight / m and / or increasing product throughput speed the cooling section.
  • In the cooling of hot wide strip with spray and laminar water, cooling water quantities of the order of 10,000 m³ / h and more are used today.
  • A specialist report from 1982 (Wagner, R. et al.: Stahl u. Eisen 102 (1982) No. 12, pp. 595/99), in which, among other things, shows how great the worldwide difficulty in cooling high-speed wire rod from high-performance wire rod mills had become had even been asked:
    It is considered desirable that, in addition to the different air cooling devices, the mill designer finally offers a suitable and economically working water cooling section using scientific knowledge.
    The problem was solved with cooling in pressurized water within pressure cooling pipes with narrow pipe ends from the beginning of 1983 (Krenn, W .: DP 16 08 327 and 19 25 416). A foreign iron and steel mill left the high-performance wire rolling mill after the retrofitting of the spray water cooling sections, and in late 1983 theirs Equip the steel bar mill with cooling in pressurized water within pressure cooling pipes (Schifferl, HA et al.: Berg- und Hüttenmännchen Monthly Notebooks, 131st Year (1986), Issue 11, p. 418).
  • The first step from the cooling of hot rolled wire rod from the rolling heat with splash water for cooling in pressurized water within single-cell pressure cooling tubes had, when the driven cooling temperature was sufficiently far above the quality-dependent martensite line in the ZTU diagram, solved the problems then pending the time that, compared to cooling with splash water, the considerably higher-reaching cooling intensity in pressurized water was already sufficient. It was reported in 1986 from the cooling of hot-rolled wire rod, which is cooled with fan air on a conveyor belt, that the structure in each individual turn of the wire rod coil is uneven, since the two sections of each turn in the area of the center of the conveyor belt cool more quickly as the sections that lie on the two outer sides of the conveyor belt (Hoss, KF .: Stahl u. Eisen 106 (1986) No. 7, pp. 313/16). In order to avoid or reduce the negative effect of this cooling of the fan-out windings in the fan air, the cooling in pressurized water should be able to be brought to a cooling temperature which is so low that it does not get into the martensite area so that cooling with fan air can be dispensed with. Where this is not possible due to quality, the cooling in pressurized water must be carried out as deeply as possible so that the deficiency from cooling with blown air can be reduced. With the process and three-cell pressure cooling unit described in the application for the grant of a patent dated August 3, 1986, it is possible to drive a cooling temperature that may be closer to the quality-dependent martensite line in the ZTU diagram. The extremely short times mentioned, which are available for the thermal processes in the pressure cooling unit, the unknown, unnamed imponderables when heat is removed within the three-cell pressure cooling unit in pressurized water, lead to fears that the cooling will only be conducted via the one controlled inflow of pressurized water the convection pressure chamber could not be sufficient.
  • The invention has for its object to develop a method and pressure cooling unit with which the heat removal during cooling shaped, heavy to light, hot, continuous production goods made of steel and metal in pressurized water, within a pressure cooling unit, can be performed so that the majority of the steel and metal production goods with increased metallurgical and temperature accuracy, greater uniformity across the width and length of the production goods to be cooled and better economic efficiency.
  • The object is achieved in that the pressure cooling unit in terms of the system from a single pressure chamber, from two, three or more pressure chambers product-dependent volume, each limited by two stagnation edges (constrictions), in which there is preferably at least one cooling and guiding pressure water inflow and a condensation pressurized water inflow, preferably distributed in the form of a shower, is arranged in the respective pressure chamber and, in terms of the process, is preferably subjected to a part of a higher quantity of pressurized water which is necessary to extract heat from the production goods in such a way that the product-dependent cooling unit, in the convection cooling part Length, cooling pressurized water flows in, which is preferably heated up to the boiling point together with the incoming pressurized pressurized water, and that the hot water / steam mixture produced therefrom, in the directly adjoining evaporative cooling section of product-dependent length, by E If the heat of evaporation is removed from the hot water / steam mixture, heat is further removed from the product to be produced, the degree of evaporation being guided by the pressurized condensation water flowing in the region of the evaporation.
  • The convection cooling part is the part of the pressure cooling unit in which the cooling pressure water and preferably the guide pressure cooling water leading to the boiling point is heated to the boiling temperature.
  • The evaporative cooling part is the part of the pressure cooling unit in which the pressurized water, which is preferably heated to boiling temperature in the convection part, evaporates as a hot water / steam mixture, conducted through the condensed pressurized water.
  • Cooling pressurized water is pressurized water that only serves to extract heat.
  • Leading pressurized water is pressurized water that is used to guide the heating of the pressurized water preferably to the boiling point and to remove heat.
  • Condensation pressure water is pressure water that serves to guide the degree of evaporation.
  • The pressure chamber into which the main part of the cooling pressure water flows, usually the middle one, is referred to as a convection pressure chamber, even if the pressure cooling unit has only a single pressure chamber. All other pressure chambers are referred to as the evaporation pressure chamber, irrespective of whether, in terms of the process, the heat is extracted primarily by evaporation or by convection.
  • Inlet stowage edge is the stowage edge of a pressure chamber through which the continuous production material enters the pressure chamber.
  • Inflow stowage edge is the storage edge of a pressure chamber through which the pressurized water / hot water / steam mixture flows into the pressure chamber.
  • In order to be able to process the pressure water flow for cooling with the pressure cooling unit according to the invention in such a way that the selected, product- and quality-related cooling process occurs and the pressure cooling unit can be kept functional, the systematic training is such that
    - The cooling, guiding and condensation pressurized water supply lines to the pressure cooling unit are dimensioned so that the pressure losses in them are low,
    that flow-regulating valves with actuators are arranged in the cooling, guiding and condensation pressurized water supply lines,
    that the separation of the cooling and guide pressurized water can be dispensed with and for these, as guide pressurized water, only one feed line with a flow-regulating valve with an actuator is arranged,
    that the inflow openings for the cooling, guiding and condensing pressurized water are designed with almost no back pressure resistance,
    - that the damming edges of the single pressure chamber and all pressure chambers have so much flow cross-section during the product flow that the quantity of cooling, guiding and condensing pressurized water required for the removal of heat can flow evenly and undisturbed,
    that a preferably coupled water hammer protection and water suction device is preferably arranged in each pressure chamber, as seen in the direction of product flow, which protects the pressure cooling unit against destruction when medium and heavy production goods run in and prevents light goods from breaking out by sucking off the water in the product flow breaks,
    that a flow-controllable hot water-steam mixture extraction device is arranged in the pressure chambers, which enables the use of the hot water-steam mixture outside of the cooling process,
    - That to avoid air access to the product surface to be cooled during the cooling process, between two or more pressure cooling units, the space between the pressure cooling units is covered with displaceable water retention socket.
  • In order to be able to adapt the cooling with the pressure cooling unit according to the invention to the different products and product weights / m as well as the changing product qualities, different pressure cooling unit designs and circuits are selected in terms of process,
    - That in a pressure cooling unit with a single pressure chamber, the cooling and guiding pressure water is preferably routed centrally into the pressure chamber and the condensation pressure water in front of the accumulation edges at the pressure chamber ends,
    - That in a pressure cooling unit with a single pressure chamber, the cooling and guiding pressurized water in the area of the reservoir at one end of the pressurized room and the condensed pressurized water at the other are led into the pressurized room,
    that the cooling and guiding pressure water is led into the convection pressure chamber and the condensation pressure water into one or more evaporation pressure rooms,
    - That the cooling and guiding pressure water is led into the convection pressure chamber, further guiding pressure water into one or more evaporation pressure rooms, preferably after the inflow dam, and the condensation pressure water is led into one or more evaporation pressure rooms,
    - that the condensation pressurized water, in a number of pressure rooms dependent on the product, quality and cooling, does not flow into certain pressure rooms,
    - that the pre-pressure of the pressurized water, in the case of heavy, cooled goods to be cooled compared to light, the weight / m and the product goods cross-section is raised accordingly and the narrowing in the accumulation edges is extended so that the accumulation edges also act as water-lubricated plain bearings,
    - That the course of heat removal can be run both with a quality-related maximum heat transfer value α and with a pressure cooling unit-related minimum, within a comparatively long length of the pressure cooling unit with a comparatively narrow range in the cooling temperature.
  • The advantages achieved by the invention are, in particular, that with the method and pressure cooling unit according to the invention, a large part of the shaped, heavy and medium, hot, continuous production goods can be cooled in a guided manner, so that the desired cooling intensity sequences are in accordance with product dimensions, quality and time sequence can be operated with a comparatively very small bandwidth, so that no undesired structural components can form in the finished product and that only a comparatively small amount of pressurized water is required for this.
  • Since the inventor has no publication that describes the phenomena when extracting the heat from shaped, hot, continuous production goods made of steel and metal, in a pressure chamber by pressurized water, he explains the advantage with the help of measuring records, which the processes during Extraction of the heat from a hot rolled rolling stock in pressurized water within a pressurized cooling unit with only a single pressurized chamber and accumulation edges at the pressurized chamber ends.
    Figure imgb0002
  • The measurement records 1 - 2 and 3 - 4 show that the cooling temperature becomes stable to the extent that the amount of pressure water flowing through increases in relation to the pressure length.
    In other words, the cooling temperature becomes stable to the extent that, in relation to the amount of pressurized water flowing through, the distance between the damming edges decreases and the pressure chamber becomes shorter.
    The measurement records in the sequence 3 - 2, with the pressure chamber lengths 3 - 1, with the pressurized water quantities 10 - 11 (may be considered the same for this consideration), confirm this conclusion.
    The numbers for the length of the pressure chamber and the amount of pressure water are ratio numbers.
    If the pressure chamber according to measurement record 2 were arranged as a convection pressure chamber between two evaporation pressure chambers and the effective heat transfer value in the two subsequent evaporation pressure chambers were only the same, the cooled product would have a cooling temperature of around 350 ° C in the order of magnitude, this would be according to the invention Incoming condensation water does not limit the cooling intensity in the evaporation pressure rooms to, for example, 550 ° C. In practice, the inflowing amount of pressurized water would be reduced in order not to have to limit the effect of the heat removal by the heat of vaporization by a higher amount of condensed pressurized water.
    Figure imgb0003
    For the representation of the heat transfer coefficient α, the well-known diagram of the dependency in container boiling is used as a representation aid.
    The measuring records 2 show a heat removal at an α value of 24,000 kcal / m³.h. ° C (point X). With increasing evaporation of the hot water-steam mixture, the α value self-propels towards its maximum (point Y), in order to then drop sharply to the value of point Z.
  • The addition of cold condensed pressurized water in the evaporative cooling section of the pressure cooling unit increases the density, as a result of which the α value is stopped, stabilized or reduced as it rises as it drives. The α value is increased again by reducing the amount of condensed water under pressure in the same way.
    With the pressure cooling unit according to the invention, the heat extraction up to the α value X is primarily carried out with the guide pressure water and stabilized at this value with the condensation pressure water and kept at this value in the event of changes in the input values, so that it is possible for everyone to be physically in To be able to run pressurized water, product-, dimension- and quality-related cooling process, for heavy, medium and light production goods, with a comparatively small cooling temperature range and small amount of pressurized water.
  • Three exemplary embodiments of the invention are shown schematically in the drawing in terms of the system and process and are described below. Show it
    • 1 is a pressure cooling unit with a single pressure chamber,
    • 2 shows the process of heat removal with guided evaporation, in a simplified, schematic representation,
    • Fig. 3 is a pressure cooling unit with three pressure rooms and
    • Fig. 4 is a pressure cooling unit with five pressure rooms.
  • 1 and 2: In the pressure cooling unit (1) with a single pressure chamber (2), the accumulation edges (3) and (4), also called the inlet and outlet stowage edge, the cooling flows through the inflows (5) and (6) - And guide pressurized water via the valves with actuator (13) and (14), from the pressurized water supply lines (10) and (11) into the pressure chamber (2).
    In the convection cooling part (8), the cooling and guiding pressurized water is preferably heated to its boiling temperature, which flows as a hot water-steam mixture in the evaporative cooling part (9), in which the pressure through the inflow (7) into the pressure chamber (2 ), via the valve with actuator (15), from the pressurized water supply line (12), inflowing condensed pressurized water the increasing, self-propelled evaporation (SV), through the metered inflowing condensed pressurized water, into a guided evaporation (GV) on the product -, dimension and quality-based evaporation guide point (VF) is converted. In order to avoid that production goods - except for light items - are damaged by water hammer when entering the water-filled pressure cooling unit and that the light production product breaks out, a water hammer protection device (19), which is preferably coupled to a water suction device, is preferably arranged in the pressure breaks and sucks water up to the point in time at which the beginning of the continuous production goods has reached the outlet storage rim of the relevant pressure chamber.
    When heat is removed from medium and heavy production goods, a large amount of hot water-steam mixture is produced, so it is useful to arrange a hot water-steam mixture extraction device (20) preferably in all pressure rooms. If two or more pressure cooling units are arranged in series, the air should be admitted to the product surface to be cooled between these are prevented, this space is covered with a displaceable water reservoir sleeve (21).
  • Fig. 3: In the pressure cooling unit (1) flows into the convection pressure chamber (8.1), with the accumulation edges (3) and (4), through the inflow (16), the cooling and guiding pressure water together with the valve Stellglid (18), from the pressurized water supply line (17), is preferably heated there to its boiling point and flows as a hot water / steam mixture over the accumulation edges (3) and (4) into the evaporation pressure chambers (9.1) and (9.2) and flows from there, extracting heat from the production goods through the heat of vaporization, through the accumulation edges (3.1) and (4.1) from the pressure cooling unit.
    The process of cooling medium-sized production goods, from the second cooling process onwards: At the moment the production goods that have previously passed through flow out, the inflow of the cooling and guide pressurized water is interrupted by the inflows (5) and (6) or (16) and (6.1) and (6.2) reduced to a minimum value and the water suction device of the combined water hammer protection with water suction device (19), (19.1) and (19.2) switched on in a pulse-controlled manner, so that the water in the pressure chambers is depressurized and suctioned off. The production goods run into the pressure cooling unit, if the water pressure currently arising in a pressure chamber exceeds a certain level, the water hammer protection devices (19.1), (19) and (19.2) respond as soon as the beginning of the production goods reaches the respective discharge storage rim (3), ( 4) and (4.1) of the pressure chambers (9.1), (8.1) and (9.2), the respective water hammer protection and water suction device (19.1), (19) and (19.2) switches off, at the same time the inflows (7.1), ( 6.1), (5), (4) or (16), (6.2) and (7.2) with the relevant target pressure water quantity, product, dimension and quality related. The target pressure water quantity specified in the recipe is applied to the shaped, hot, continuous surface of the production goods in a split second and extracts heat from it. If the cooling temperature measured after the pressure cooling unit is too high, the inflows (5) or (16), (6.1) and (6.2) are preferably increased in sequence until the target cooling temperature is reached.
    At this moment, the condensed pressure water flowing in through the inflows (7.1) and (7.2) is already leading the degree of evaporation of the hot water-steam mixture at the evaporation guide point VF, which would otherwise reach the outflow dam edges (3.1) and ( 4.1) self-driving would rise up to the arbitrary point SV, so that the desired target cooling temperature is applied to the recorder.
    If physical input data deviate from the data currently present during the passage of the production goods, by fluctuations in the inlet temperature, by changing the throughput speed, by changing the nature of the scale, etc., this is done by metered changes the amount of inflow of the condensation water, the evaporation guide point VF pushed back or forth and thus the degree of evaporation.
    If the amount of hot water-steam mixture generated during heat extraction reaches a specified amount, then a specified partial amount is preferably used via the hot water-steam mixture removal device (20.1) and (20.2) for use outside of this cooling process, the pressure cooling unit (1 ). In order to keep the wear of the baffle edges low, it is useful to increase the pressure of the pressurized water when the production goods get heavier and cool and to lengthen the constrictions in the baffle edges so that the baffle edges (3.1), (3), (4) and (4.1 ) also act as a water-lubricated plain bearing.
  • Fig. 4: The pressure cooling unit (1) functionally shown in Fig. 4, with the convection pressure chamber (8.1) and four evaporation pressure chambers (9.1 - 9.4), is both for cooling with a maximum of heat extraction achievable in such a pressure cooling unit as well suitable for cooling with minimally durable heat removal. The procedure differs only in that the heat transfer value .alpha. Is driven at the quality-related maximum value in one process of heat extraction and at its minimum value in the other process at its pressure cooling unit.
    The length of the pressure cooling unit is of the order of 1 m to 20 m and more. If the pressure cooling unit is used after shaping, if it is used within the deformation process, the lengths must adapt to the deformation conditions and be shortened to a fraction of a meter. Existing short pressure cooling units can also be functionally cut to longer ones with the help of the water retention socket.

Claims (19)

1. Process and pressure cooling unit for guided cooling of shaped, heavy to light, hot, continuous production goods made of steel and metal in pressurized water,
characterized in that the pressure cooling unit (1) systematically from a single (2) pressure space, from two, three or more pressure spaces (8.1) and (9.1 to 9.n) product-dependent volume, each limited by two storage edges (3 to 3.n ) and (4 to 4.n) (constrictions), in which there is preferably at least one cooling (5) and guide pressurized water inflow (6) and a condensation pressurized water inflow (7), these preferably over part of the respective pressure chamber reaching, is arranged and the process is preferably acted upon with a part higher amount of pressurized water which is necessary to extract heat from the production goods in that the (5) cooling flowing into the pressure cooling unit (1), in the convection cooling part (8) depending on the product length -Pressure water, together with the inflowing (6) guide pressure water, is preferably heated there to the boiling point and that the hot water-steam mixture produced in the directly connected to it Eating evaporative cooling section (9) of product-dependent length, by removing the heat of evaporation from the hot water-steam mixture, further heat is withdrawn from the production goods, the degree of evaporation being guided by the (7) condensation pressure water flowing in in the region of the evaporation.
2. The method and pressure cooling unit according to claim 1, characterized in that the cooling (10), guide (11) and condensation pressure water supply line (12) to the pressure cooling unit (1) are dimensioned so that the pressure losses in them are low .
3. The method and pressure cooling unit according to claim 1 and 2, characterized in that in the cooling, guiding and condensing pressurized water supply lines (13) (14) and (15) flow-controllable valves with actuator (13), (14) and (15) are arranged.
4. The method and pressure cooling unit according to claim 1 to 3, characterized in that the separation of cooling and guide pressure water inflow can be omitted (16) and for this together, only one feed line (17) with a flow-controllable valve with actuator (18) is arranged is.
5. The method and pressure cooling unit according to claim 1 to 4, characterized in that the inflows for the cooling, guiding and condensation pressurized water (5), (6) and (7) are formed with almost no dynamic pressure resistance.
6. The method and pressure cooling unit according to claim 1 to 5, characterized in that the baffle edges of the single pressure chamber and all pressure chambers (3 to 3.n) and (4 to 4.n) have as much flow cross-section during the product run that that for the heat removal necessary, product-, quality- and cooling-related cooling, routing and condensation pressurized water can flow evenly and undisturbed.
7. The method and pressure cooling unit according to claim 1 to 6, characterized in that a preferably coupled water hammer protection and water suction device (19) is arranged in each pressure chamber, preferably in the direction of product flow, preferably in front of the outlet stopping edge, which presses the pressure cooling unit in front when medium and heavy production goods run in Protects destruction and prevents the production of light goods from breaking out by sucking off the water during product breaks.
8) Method and pressure cooling unit according to claim 1 to 7, characterized in that a flow-controllable hot water-steam mixture removal device (20) is preferably arranged in the pressure chambers, which enables the use of the hot water-steam mixture outside the cooling process.
9) Method and pressure cooling unit according to claim 1 to 8, characterized in that to avoid air access to the product surface to be cooled during the cooling process between two or more pressure cooling units, the space between the pressure cooling units with displaceable water retention step (21) is bridged.
10) Method and pressure cooling unit according to claim 1 to 9, characterized in that the cross section of the pressure cooling unit (1) is adapted in all its pressure chambers and accumulation edges to the cross-sectional shape of the product to be cooled.
11) Method and pressure cooling unit according to claim 1-10, characterized in that the pressure cooling unit, for cooling heavy production goods, preferably divided into a lower and an upper part, is preferably undivided for cooling light production goods.
12) Method and pressure cooling unit according to claims 1-11, characterized in that in a pressure cooling unit (1) with a single pressure chamber (2), the cooling and guiding pressurized water (5) and (6) preferably centrally in the pressure chamber and that Condensation water (7) is led in front of the accumulation edges at the pressure chamber ends (3) and (4).
13) Method and pressure cooling unit according to claims 1-12, characterized in that in a pressure cooling unit (1) with a single pressure chamber (2) the cooling and guiding pressurized water 85) and (6) in the area of the accumulation on one End of the pressure chamber and the condensation water (7) at the other into the pressure chamber.
14) Method and pressure cooling unit according to claim 12 + 13, characterized in that the position of the inflows of the cooling (5) and guide pressure water (6) and the condensation pressure water (7) also in the convection pressure chamber (8.1) of a pressure cooling unit (1) with the evaporation pressure spaces (8.1 to 8.n) and (9.1 to 9.n).
15. The method and pressure cooling unit according to claim 1-14, characterized in that the cooling (5) and guide pressure water (6) in the convection pressure chamber (8.1) and the condensation pressure water (7) in one or more evaporation Pressure rooms is led.
16. The method and pressure cooling unit according to claim 1-15, characterized in that the cooling (5) and guide pressure water (6) in the convection pressure chamber (8.1), further guide pressure water (6.1 to 6.n) in one or more evaporation pressure spaces (9.1 to 9.n), preferably after the inflow dam, and the condensation water is led into one or more evaporation pressure spaces.
17. The method and pressure cooling unit according to claim 1-16, characterized in that the condensation pressure water, in a product, quality, and cooling-related number of pressure spaces, does not flow into certain pressure spaces.
18. The method and pressure cooling unit according to claim 1-17, characterized in that the pressure of the pressurized water, in the case of heavy, cooled goods to be cooled compared to light, the weight / m and the goods cross-section is raised accordingly and the constriction in the accumulation edges thus extended is that the accumulation edges also act as water-lubricated plain bearings.
19. The method and pressure cooling unit according to claim 1-19, characterized in that the course of heat removal with both a quality-related maximum heat transfer value α and with a pressure cooling unit-related minimum, within a comparatively large length of the pressure cooling unit with a comparatively narrow range in the cooling temperature, are driven can.
EP19880730063 1987-03-13 1988-03-14 Method of and pressure cooling apparatus for cooling a continuous product Expired - Lifetime EP0287503B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3708128 1987-03-13
DE19873708128 DE3708128A1 (en) 1987-03-13 1987-03-13 Process and pressure cooling unit for leaded cooling shaped, heavy to light, hot, continuous products of steel and metal in pressure water

Publications (3)

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EP0287503A2 true EP0287503A2 (en) 1988-10-19
EP0287503A3 EP0287503A3 (en) 1989-02-08
EP0287503B1 EP0287503B1 (en) 1993-07-28

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EP19880730063 Expired - Lifetime EP0287503B1 (en) 1987-03-13 1988-03-14 Method of and pressure cooling apparatus for cooling a continuous product

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EP (1) EP0287503B1 (en)
AT (1) AT391880B (en)
DE (1) DE3708128A1 (en)
ES (1) ES2043880T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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.
DE4429203C2 (en) * 1994-08-18 1997-05-28 Krenn Walter Process and pressure cooling unit for cooling a continuous production item made of steel or other
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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1925416A1 (en) * 1968-03-12 1970-11-26 Walter Krenn Cooling rolled wire
DE1608327A1 (en) * 1968-03-12 1970-12-10 Walter Krenn Kuehlstrecke wire rod or the like.
DD110774A1 (en) * 1974-04-10 1975-01-12
DD147506A1 (en) * 1979-11-29 1981-04-08 Bernhard Hoericke Cooling tube for the direct cooling of warm, preferably rolling material
DE3043117A1 (en) * 1968-03-12 1982-07-01 Walter Krenn Rolled prod. cooling line - comprising cooling pipes of cross=section similar to prod. cross=section
EP0064771A2 (en) * 1981-05-13 1982-11-17 VEB Stahl- und Walzwerk "Wilhelm Florin" Hennigsdorf Pressurised cooling pipe for the direct intensive cooling of rolling mill products
DE3626741A1 (en) * 1986-08-07 1988-02-18 Krenn Walter Cooling unit and method for cooling warm rolling, with / without direct patenting, in pressure cooling water

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU559731B2 (en) * 1981-11-19 1987-03-19 Kawasaki Steel Corp. Continuously quenching steel plates

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1925416A1 (en) * 1968-03-12 1970-11-26 Walter Krenn Cooling rolled wire
DE1608327A1 (en) * 1968-03-12 1970-12-10 Walter Krenn Kuehlstrecke wire rod or the like.
DE3043117A1 (en) * 1968-03-12 1982-07-01 Walter Krenn Rolled prod. cooling line - comprising cooling pipes of cross=section similar to prod. cross=section
DD110774A1 (en) * 1974-04-10 1975-01-12
DD147506A1 (en) * 1979-11-29 1981-04-08 Bernhard Hoericke Cooling tube for the direct cooling of warm, preferably rolling material
EP0064771A2 (en) * 1981-05-13 1982-11-17 VEB Stahl- und Walzwerk "Wilhelm Florin" Hennigsdorf Pressurised cooling pipe for the direct intensive cooling of rolling mill products
DE3626741A1 (en) * 1986-08-07 1988-02-18 Krenn Walter Cooling unit and method for cooling warm rolling, with / without direct patenting, in pressure cooling water

Also Published As

Publication number Publication date
ES2043880T3 (en) 1994-01-01
EP0287503A3 (en) 1989-02-08
DE3708128A1 (en) 1988-09-22
EP0287503B1 (en) 1993-07-28
ATA60088A (en) 1990-06-15
AT391880B (en) 1990-12-10

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