EP2304060B1 - Verfahren und vorrichtung zur regelung der abkühlung und energierückgewinnung eines stahlbands in einer glüh- oder galvanisierungsstufe - Google Patents

Verfahren und vorrichtung zur regelung der abkühlung und energierückgewinnung eines stahlbands in einer glüh- oder galvanisierungsstufe Download PDF

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Publication number
EP2304060B1
EP2304060B1 EP08875607.7A EP08875607A EP2304060B1 EP 2304060 B1 EP2304060 B1 EP 2304060B1 EP 08875607 A EP08875607 A EP 08875607A EP 2304060 B1 EP2304060 B1 EP 2304060B1
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Prior art keywords
water
cooling
pressure
temperature
ejector
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English (en)
French (fr)
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EP2304060A1 (de
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Pierre- Jérôme BORREL
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Clecim SAS
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Primetals Technologies France SAS
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling

Definitions

  • the present invention relates to a method and a device for regulating the cooling necessary for forced cooling of a continuous circulating steel strip in an installation suitable for continuous annealing or continuous dipping according to the preambles of claims 1 and 6.
  • the invention relates to continuous annealing furnaces for the heat treatment of cold rolled steel strips, particularly rapid cooling of said strips.
  • the furnace must be able to provide, for tape speeds of several hundred meters per minute, heating and cooling rates and holding times adapted to the metallurgy of the treated steel. While the heating and maintenance times essentially involve the length of the furnaces and therefore the investment costs, the cooling rate poses real technological problems.
  • the water is treated according to evaporative cooling techniques such as cooling towers or air-cooling devices.
  • evaporative cooling techniques such as cooling towers or air-cooling devices.
  • the efficiency of these cooling processes is limited to minimum temperatures of approximately 30 ° C. at 35 ° C.
  • An object of the present invention is therefore to provide a cooling control method and a device for its implementation, both adapted to a forced cooling of a continuous circulating steel strip in an installation adapted to continuous annealing. or a continuous dipping galvanization allowing an advantageous cooling dynamics for any type of band in various annealing or galvanizing conditions.
  • the invention thus proposes a cooling regulation method and a device for implementing it according to claims 1 and 6.
  • a set of subclaims also has advantages of the invention as described later in the document.
  • the figure 2b schematically describes rapid cooling by cooled rolls:
  • the steel strip (B) winds between a lower layer (RI) and an upper layer (RS) of several rollers arranged side by side and having parallel main axes, said rollers being cooled by circulation of water under low pressure.
  • At least one of the two plies is able to move vertically in order to adjust the nesting of the rollers and, consequently, the arc of contact of the strip with the surface of the rollers in order to regulate the heat exchange. between the two.
  • the greater the arc of contact (by means of a large gap between the layers, that is to say an increase of the consecutive axis deviations of rollers), the more the cooling is intensified, and vice versa for reduce the cooling.
  • the Figure 2c schematically shows the cooling rate range (V Ref ), between 1 and 10000 ° C / s, of conventional steel strip cooling processes: a cooled tube process (T), a gas jet process (JG ), a cooled-roller (RR) process, a water-spray or water-gas (PE) mixing process, and finally, for the quickest, a quenching process in a water tank (TE).
  • V Ref cooling rate range
  • T cooled tube process
  • JG gas jet process
  • RR cooled-roller
  • PE water-spray or water-gas
  • TE water tank
  • the figure 3a shows a schematic diagram of the device according to the invention in relation to the figure 2a for example, where a method of cooling by gas jet (blowing) uses a blowing cell (51) on the strip (B) in continuous scrolling.
  • a method of cooling by gas jet uses a blowing cell (51) on the strip (B) in continuous scrolling.
  • the heated gas is recovered in the furnace enclosure (5) and passes into a gas / water heat exchanger (5142) whose inputs and outputs (51421 and 51422), water side (to be cooled), are connected to a unit vacuum cooling device (52) associated with said exchanger (5142).
  • the blowing of the cooling gas is provided by blowing cells consisting of a motor-blower blowing into diffusion chambers placed on either side of the strip in order to cool them. two faces.
  • the gas reheated in contact with the strip up to about 45 ° C. to 180 ° C. is sucked by the fan into the enclosure of the furnace and passes into an exchange member consisting of a gas / water exchanger from which it exits to 30 ° C - 50 ° C before being reinjected by the fan into the diffusion chambers.
  • the cooling is carried out by several cells placed one after the other along the path of the strip.
  • the device according to the invention may comprise several cooling units each comprising a cell or a battery of several blowing cells.
  • Each unit can be dimensioned to stagger the temperature of the water returned to the exchange member, for example 30 to 10 ° C in order to stagger the temperature of the cooling gases of the strip in the direction of scrolling of it.
  • a first cooling unit associated with a first exchange member located upstream of the fan acts as described above and a second cooling unit associated with a second exchange member located in downstream fan ensures very well, with a chilled water whose temperature is between 5 and 10 ° C, the cooling of the gas entering the diffusion chambers.
  • the exchange member (51, 5142) between the strip and the cooling water can thus advantageously be, depending on the type of embodiment, a water / water or gas / water exchanger and applies to the progressive cooling processes of the band as cooling by cooled tubes or by gas jets or by cooled rollers.
  • the cooling control device may comprise at least one vapor condenser (523) being disposed at the outlet of the ejector (522) of the sealed enclosure and adapted to replenish the sealed enclosure ( 521) by booster (5214) of a water level required in and, if necessary, adapted to redirect a surplus of said vaporized water to an external pipe (5233) for reuse or vapor dissipation, ideally for plant-specific or steam rejection purposes.
  • at least one vapor condenser (523) being disposed at the outlet of the ejector (522) of the sealed enclosure and adapted to replenish the sealed enclosure ( 521) by booster (5214) of a water level required in and, if necessary, adapted to redirect a surplus of said vaporized water to an external pipe (5233) for reuse or vapor dissipation, ideally for plant-specific or steam rejection purposes.
  • the cooling device may be of the "barometric" type, that is to say that the partial vacuum chamber is connected to the exchange member by a water column of height, generally equal or greater than eleven meters. This arrangement is particularly well suited to quenching type exchange sources, an example of application of the invention will be presented later.
  • It can also be of closed type, the sealed enclosure under partial vacuum being connected to the exchange member by a closed circuit comprising a circulation pump.
  • This arrangement is particularly suitable for exchange sources of the heat exchanger type.
  • the steam supplying the ejector comes from a boiler for producing steam heated with the flue gases in the direct flame heating portion of the furnace or with the flue gases from the radiant tubes (see example according to figure 4 ).
  • the amount of steam thus produced is sufficient to meet both the needs of the ejector and a band degreasing section.
  • the increase in combustion efficiency reduces the amount of gas burned and the steam production capacity may be insufficient to cover the only needs of the degreasing but remains sufficient for the supply of the gases. ejectors.
  • the condenser member of the steam coming from the ejector may be an exchanger whose steam exchange circuit is supplied with water at a low pressure, more or less hot, recovered from the installation, for example from a degreasing section, and reheated in the exchanger at a temperature equal to or slightly less than the vaporization temperature at the pressure in question.
  • It can also be constituted by a direct contact exchanger providing a direct exchange between the steam from the ejector and the cooling water to be heated and generally returns a water at a temperature not lower than the vaporization temperature at a pressure considered .
  • a part of the water leaving the condenser element at a temperature may be used, after optional cooling, as demineralized water in the continuous annealing or galvanizing plant.
  • demineralized water for example, for high-pressure cleaning of the rolls of a skin-pass mill or to compensate for the loss of demineralised water by evaporation or banding in the degreasing / rinsing tanks.
  • the method according to the invention allows the water leaving the condensing member (523) at the post-condensation temperature (T VE3 ) to be reintroduced as an addition in the sealed chamber (521) by a sheath (5214) and, if necessary, a surplus of said water is redirected to an external pipe (5233) for reuse (if the condenser is a direct contact exchanger) or vapor dissipation (if the organ condensation is a wall exchanger). Cooling is thus effectively achieved in a circulation loop / dynamic heat transfer and also has a possibility to provide an excess of heat or energy remaining to other applications in need.
  • the cooled water recovered at the outlet (5213) of the sealed enclosure (521) is a so-called ice water at the second temperature (T ER2 ) of between 5 and 10 ° C. .
  • T ER2 the second temperature
  • This is simply led back to the inlet (51421) of the exchange member (5142), for example via a sheath (5215), in order to effectively cool the flow of gas flow in the context of a band blowing cooling.
  • the invention figure 3a in view of the method and the device for its implementation thus very advantageously allows a dynamic recovery of energy stored by the water used for the forced cooling of a continuous circulating steel strip, this same water being reused for cooling purposes of the exchange member (51, 5142).
  • the figure 3b describes a variant of the device according to the figure 3a wherein a first cooling unit (52a) is associated with a first exchange member (5142a) located upstream of the fan (511) and supplied with cooled water at 30 ° C and a second cooling unit (52b) is associated a second exchange member (5142b) located between the fan (511) and the blow box (513) and supplied with ice water with a temperature of less than or equal to 10 ° C.
  • the cooling is thus more effectively accentuable while having the same energy recovery properties and other advantages related to the device according to figure 3a .
  • the figure 4 described by way of example and in relation to the figure 3a and 3b , the general flow diagram of fluids concerned by a cooling control device according to the invention in a continuous annealing system (B).
  • the annealing furnace (5) is equipped with a water cooling unit (52) associated with a rapid cooling unit of the strip according to one of the methods previously described and mentioned in Figure 2c .
  • the device according to the invention also comprises a steam production unit (53) obtained by heating with fumes collected at the entrance of the strip in the oven in the preheating zone by a sheath (531) for collecting the fumes to a boiler (53). The steam thus produced in the boiler feeds the ejector (522) of the cooling unit (52) via the sheath (532).
  • the water heated by the web heat is sensed at a suction port (51422), cooled in the sealed chamber (521) and returned to a discharge port (51421).
  • the condenser (523) receives water at (5231) and discharges heated water at (5232). In this figure, the necessary pumping and winnowing accessories have not been shown for the sake of clarity.
  • the figure 5 describes the block diagram of the device according to the invention adapted to a progressive cooling process (as in figure 2a ), for example by gas jet using four blast cells (51a, 51b, 51c, 51d) each having one of four exchangers (or exchange members) assigned (5142a, 5142b, 5142c, 5142d) and being successively placed in the opposite direction of the running of the strip (B) and two cooling units (52a, 52b) each with a sealed enclosure.
  • the cells (51) are connected in parallel pairs, ie the first two cells (51a, 51b) associated with the first cooling unit (52a) and the two second cells (51c, 51d) associated with the second cooling unit (52b).
  • Water cooled by the second cooling unit (52b) is discharged at its output (5213b) at a first outlet temperature (T ER2b ) sealed chamber partly in the battery of the first two (in the direction of the band) exchangers (5142c, 5142d) by the tubing (51421d) and partly in the first cooling unit (52a) by a booster tubing (5214a).
  • the water cooled by the first cooling unit (52a) is then discharged at its outlet (5213a) at a second outlet temperature (T ER2a ) lower than the first outlet temperature (T ER2b ) in the battery of the last two ( according to the direction of the band) exchangers (5142a, 5142b) by a pipe (51421b).
  • T ER2a second outlet temperature
  • At least one cooling unit (52a, 52b) is coupled to a plurality of heat exchange members (51a, 51b, 51c, 51d) distributed in the direction of travel of the band (B).
  • Each exchange member or group of exchange members (5142a, 5142b) mounted in parallel can thus be advantageously equipped with at least two cooling units connected in series.
  • the exchange member (51) between the steel strip (B) and the cooling water is, for example, a simple quenching cooling tank containing water maintained at a constant temperature. temperature of 30 to 50 ° C which ensures instantaneous cooling of the strip by immersion.
  • This situation exists in the quench tank at the end of maintenance at annealing temperature and before over-aging in the continuous annealing furnaces as well as in the final cooling tanks at the outlet of the furnace of the continuous annealing or final cooling lines at the outlet. of zinc pot in the galvanizing lines.
  • the water of the final quenching tank of a continuous annealing or galvanizing plant is maintained at a temperature of between 5 and 10 ° C. and ensures cooling of the so-called "water” strip.
  • the partial vacuum allows, among other things, the degassing of the water tanks and removal of dissolved oxygen, which significantly reduces the oxidation of the hot band.
  • the figures 7a , 7b illustrate means for serializing devices according to the invention or some of their elements, in order to allow more efficient regulation / dynamic cooling.
  • the figure 7a describes the series connection of two ejectors adapted to equip a sealed cooling chamber such as that described from figure 3a in that each cooling unit (52) is equipped with at least two ejectors (522a, 522b) connected in series.
  • a steam outlet of the first ejector (522a) is directly disposed at one of the inputs of the second ejector (522b) connectable to a condensing member.
  • the two ejectors are for example commonly supplied with steam by a boiler (5221).
  • the two final and common inputs (5221) of the ejectors are connected to the partial evacuation output of a sealed enclosure.
  • cooling units can be coupled to an exchange member (51) in order to advantageously stagger a decrease in the temperature of the cooling water.
  • At least one of these cooling units (52a, 52b, 52c) may also be equipped with at least two ejectors connected in series.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
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Claims (21)

  1. Verfahren zur Regelung der Kühlung, die für eine Zwangskühlung eines Stahlbandes (B) erforderlich ist, das sich im kontinuierlichen Durchlauf durch eine Anlage bewegt, die für das kontinuierliche Glühen oder für eine kontinuierliche Feuerverzinkung ausgelegt ist,
    dadurch gekennzeichnet, dass eine Kühlenergie an durch das Stahlband erwärmtes Wasser (ER) abgegeben wird, danach durch Verdampfung dieses erwärmten Wassers (ER) bei einem Druck (PER2), der niedriger als der atmosphärische Druck (P0) ist, entnommen wird und schließlich durch Kondensation bei einer höheren Temperatur (TVE2) nach thermomechanischer Verdichtung durch eine Venturi-Vorrichtung, die mit Dampf mit einem Druck (PVE1) gespeist wird, der höher als der atmosphärische Druck (P0) ist, zurückgegeben wird,
    und die folgenden Schritte aufweisend:
    • das durch das Band erwärmte Wasser (ER) wird in einem Austauschorgan (5142) bei einem ersten Druck (PER1), der dem atmosphärischen Druck (P0) nahekommt, und einer ersten Temperatur (TER1), die deutlich niedriger als die Verdampfungstemperatur des Wassers bei dem Druck (PER1) ist, aufgenommen,
    • das erwärmte Wasser (ER) wird von dem Austauschorgan (5142) aus in Form eines Strahls in eine dichte Kammer (521) eingeleitet, die mit wenigstens einem Ejektor (522) als Venturi-Vorrichtung ausgestattet ist, wobei dieser Ejektor außerdem mit Wasserdampf (5221) mit einem Eintrittsdruck (PVE1) gespeist wird, der höher als der atmosphärische Druck (P0) ist,
    • der Ejektor gewährleistet in der dichten Kammer (521) ein Teilvakuum, das einem zweiten Druck (PER2) entspricht, welcher niedriger als ein Verdampfungsdruck des Wassers bei der ersten Temperatur (TER1) ist,
    • ein abgekühltes Wasser wird an einem Ausgang (5213) der dichten Kammer (521) bei einer zweiten Temperatur (TER2) zurückgewonnen, die einer Verdampfungstemperatur des Wassers bei dem zweiten Druck (PER2) entspricht, um an das Austauschorgan (5142) zurückgegeben zu werden.
  2. Verfahren nach Anspruch 1, wobei ein zusätzlicher Kühlkreis am Ejektorausgang verwendet wird, wobei:
    • ein Dampf, der aus dem Ejektor (522) austritt und eine thermische Energie aufweist, die mit einer abnehmenden kinetischen Energie zusammenhängt und um den von Kühlwasser stammenden Wärmeanteil erhöht ist, der durch Verdampfung erhalten wurde, mit einem Austrittsdruck (PVE2) des Ejektors erhalten wird, der höher als der atmosphärische Druck (P0) ist,
    • dieser Dampf aus dem Ejektor mit einer Austrittstemperatur (TVE2) austritt, die einem Verdampfungsdruck des Wassers bei dem Austrittsdruck (PVE2) entspricht, und ein Kondensationsorgan (523) speist, aus dem er mit einer Nachkondensations-Temperatur (TVE3) wieder austritt, die niedriger als die Austrittstemperatur (TVE2) des Ejektors ist, und unter einem Verdampfungsdruck des Wassers bei einem Druck, der dem atmosphärischen Druck nahekommt (PVE3 = P0),
    • das Kondensationsorgan (523), durch eine Wand hindurch, die Erwärmung eines äußeren Wasserkreislaufs (5231, 5232) bei einem äußeren Eintrittsdruck (PE1) von einer äußeren Eintrittstemperatur (TE1), die niedriger als eine Verdampfungs-Austrittstemperatur (TE2) bei dem äußeren Eintrittsdruck (PE1) ist, bis auf die äußere Austrittstemperatur (TE2), die einer Verdampfungstemperatur des Wassers bei einem äußeren Austrittsdruck (PE2) entspricht, gewährleistet.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass ein zusätzlicher Kühlkreislauf am Ejektorausgang verwendet wird, wobei:
    • ein Dampf, der aus dem Ejektor (522) austritt und eine thermische Energie aufweist, die mit einer abnehmenden kinetischen Energie zusammenhängt und um den von Kühlwasser stammenden Wärmeanteil erhöht ist, der durch Verdampfung erhalten wurde, mit einem Austrittsdruck (PVE2) erhalten wird, der höher als der atmosphärische Druck (P0) ist,
    • dieser Dampf aus dem Ejektor mit einer Austrittstemperatur (TVE2) austritt, die einem Verdampfungsdruck des Wassers bei dem Austrittsdruck (PVE2) entspricht, und in einem Wärmetauscher mit Direktkontakt durch Wasser in direkten Kontakt gebracht wird, wobei dieses Wasser einen äußeren Eintrittsdruck (PE1) aufweist, von einer äußeren Eintrittstemperatur (TE1), die niedriger als eine Austrittstemperatur (TE2) ist, bis zu dieser Austrittstemperatur (TE2) des Gemisches der zwei Fluide Wasser-Dampf, die in der Lage ist, die Verdampfungstemperatur des Wassers bei einem äußeren Eintrittsdruck (PE1) zu erreichen.
  4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Wasser, das aus dem Kondensationsorgan (523) mit der Nachkondensations-Temperatur (TVE3) austritt, als Zusatz über einen Kanal (5214) wieder in die dichte Kammer (521) eingeleitet wird, und falls erforderlich, ein Überschuss dieses Wassers zu einer äußeren Rohrleitung (5233) zur Wiederverwendung oder zur Ableitung von Dampf umgeleitet wird.
  5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass am Ausgang der Kühleinheit das abgekühlte Wasser, das am Ausgang (5213) der dichten Kammer (521) wiedergewonnen wird, ein sogenanntes Eiswasser ist, bei dem die zweite Temperatur (TER2) zwischen 5 und 10 °C liegt.
  6. Vorrichtung zur Regelung der Kühlung, die für eine Zwangskühlung eines Stahlbandes (B) erforderlich ist, das sich im kontinuierlichen Durchlauf durch eine Anlage bewegt, die für das kontinuierliche Glühen oder für eine kontinuierliche Feuerverzinkung ausgelegt ist, dadurch gekennzeichnet, dass sie aufweist:
    • wenigstens ein Austauschorgan (51, 5142), das einen Wärmeübergang von dem Stahlband auf ein Kühlwasser sicherstellt und einen Auslass (51422) für das so erwärmte Kühlwasser umfasst,
    • wenigstens eine Kühleinheit (52), die aus einer dichten Kammer (521) besteht, die mit dem Auslass (51422) des Austauschorgans (5142) verbunden ist und mit wenigstens einem Ausgang (5211) an einer Venturi-Effekt-Vorrichtung wie etwa einem Dampf-Ejektor (522) ausgestattet ist, und in welcher das Kühlwasser selbst einer Abkühlung durch Verdampfung unter Vakuum unterzogen wird,
    • einen Hilfsausgang (5213) der dichten Kammer (521), der mit einem Eingang (51421) des Austauschorgans (51, 5142) verbunden ist.
  7. Vorrichtung nach Anspruch 6, welche wenigstens ein Dampfkondensationsorgan (523) umfasst, das am Ausgang des Ejektors (522) der dichten Kammer angeordnet ist und dafür eingerichtet ist, die dichte Kammer (521) durch Zusatz einer darin benötigten Wassermenge wieder zu speisen und, falls erforderlich, dafür eingerichtet ist, einen Überschuss dieses verdampften Wassers zu einer äußeren Rohrleitung (5233) zur Wiederverwendung oder zur Ableitung von Dampf umzuleiten.
  8. Vorrichtung nach einem der vorhergehenden Ansprüche 6-7, dadurch gekennzeichnet, dass der Ejektor einen Hilfseingang (5221) zu seinem anderen Eingang am Ausgang (5211) der dichten Kammer (521) aufweist, über welchen der Ejektor mit wenigstens einem Teil oder auch mit der Gesamtmenge des benötigten Dampfes mittels eines Dampferzeugers (53) gespeist wird, der mit Abgasen (531) in einer Heizzone des Ofens mit direkter Flamme oder durch Rauchgase des Strahlrohrabschnitts geheizt wird.
  9. Vorrichtung nach einem der vorhergehenden Ansprüche 6-8, dadurch gekennzeichnet, dass mehrere Kühleinheiten (52a, 52b, 52c) mit einem Austauschorgan (51) gekoppelt sind, um Hinblick auf eine stufenweise Durchführung der Verringerung der Temperatur des Kühlwassers.
  10. Vorrichtung nach einem der vorhergehenden Ansprüche 6-11, dadurch gekennzeichnet, dass wenigstens eine Kühleinheit (52a, 52b) mit mehreren Wärmetauschorganen (51a, 51b, 51c, 51d) gekoppelt ist, die in der Durchlaufrichtung des Bandes (B) verteilt sind.
  11. Vorrichtung nach einem der vorhergehenden Ansprüche 7-10, dadurch gekennzeichnet, dass ein Teil oder auch die Gesamtmenge des Wassers, das aus dem Kondensationsorgan (523) austritt, nach eventueller Abkühlung wieder in einen Kreislauf von vollentsalztem Wasser injiziert werden kann, der von der Anlage zum kontinuierlichen Glühen oder zur kontinuierlichen Feuerverzinkung verwendet werden kann.
  12. Vorrichtung nach einem der vorhergehenden Ansprüche 7-11, dadurch gekennzeichnet, dass das Organ zur Kondensation (523) des Dampfes, mit dem der Ejektor betrieben wird, ein Wandwärmetauscher ist.
  13. Vorrichtung nach einem der vorhergehenden Ansprüche 7-11, dadurch gekennzeichnet, dass das Organ zur Kondensation (523) des Dampfes, mit dem der Ejektor betrieben wird, ein Direktkontakt-Wärmetauscher ist.
  14. Vorrichtung nach einem der vorhergehenden Ansprüche 6-13, dadurch gekennzeichnet, dass jedes Austauschorgan oder jede Gruppe von parallelgeschalteten Austauschorganen (5142a, 5142b) mit wenigstens zwei Kühleinheiten ausgestattet ist, die in Reihe geschaltet sind.
  15. Vorrichtung nach einem der vorhergehenden Ansprüche 6-14, dadurch gekennzeichnet, dass jede Kühleinheit (52) mit wenigstens zwei Ejektoren (522a, 522b) ausgestattet ist, die in Reihe geschaltet sind.
  16. Vorrichtung nach einem der vorhergehenden Ansprüche 6-15, dadurch gekennzeichnet, dass das Austauschorgan (51) zwischen dem Stahlband und dem Kühlwasser ein Gas-Wasser-Wärmetauscher ist.
  17. Vorrichtung nach einem der vorhergehenden Ansprüche 6-16, dadurch gekennzeichnet, dass das Austauschorgan (51) wenigstens zwei Wärmetauscher (5142a, 5142b) aufweist, die auf einem Wärmeaustauschweg zwischen dem Stahlband und dem Kühlwasser in Reihe angeordnet sind, wobei jeder der Wärmetauscher mit einer von zwei Kühleinheiten (51a, 51b) verbunden ist, wobei die zwei Ejektoren-Ausgänge (522a, 522b) dieser letzteren Kühleinheiten parallelgeschaltet sind.
  18. Vorrichtung nach Anspruch 17, wobei:
    - das Austauschorgan (51) wenigstens einen Lüfter (511) umfasst, der über einen Luftkanal (512) einen Gebläsekasten (513) speist, in welchem das Stahlband durchläuft, und von einem Luftkanal (5141) gespeist wird, der die heiße Luft in dem Kasten (513) aufnimmt,
    - jeder der Luftkanäle (512, 513) mit einem der zwei Wärmetauscher (5142a, 5142b) gekoppelt ist.
  19. Vorrichtung nach einem der vorhergehenden Ansprüche 6-18, dadurch gekennzeichnet, dass zwischen der dichten Kammer (521) und dem Austauschorgan (51, 5142) ein Wasserzirkulationskreis angeordnet ist, der einen Aufnahmestutzen (5212) und einen Rücklaufstutzen (5215) umfasst, die im Idealfall eine Wassersäule mit einer Höhe darstellen, die 11 Meter oder mehr beträgt.
  20. Vorrichtung nach einem der vorhergehenden Ansprüche 6-15 und 19, dadurch gekennzeichnet, dass das Austauschorgan (51) zwischen dem Stahlband und dem Kühlwasser ein Behälter zur Kühlung durch direkte Abschreckung (54) ist.
  21. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen der dichten Kammer (521) und dem Austauschorgan (51, 5142) ein Wasserzirkulationskreis angeordnet ist, der aus einem geschlossenen Kreis besteht, der wenigstens eine Umwälzpumpe aufweist.
EP08875607.7A 2008-07-29 2008-07-29 Verfahren und vorrichtung zur regelung der abkühlung und energierückgewinnung eines stahlbands in einer glüh- oder galvanisierungsstufe Not-in-force EP2304060B1 (de)

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DE102012010382A1 (de) * 2012-05-29 2013-12-05 Bilstein Gmbh & Co. Kg Verfahren und Anordnung zur Rückgewinnung von Wärmeenergie bei der Wärmebehandlung von kaltgewalztem Stahlband in einem Haubenglühofen
FR3006694B1 (fr) * 2013-06-10 2015-06-05 Cockerill Maintenance & Ingenierie Sa Installation de traitement thermique de bande metallique en defilement continu avec refroidissement permettant la valorisation de l'energie extraite
FR3008108B1 (fr) * 2013-07-08 2016-12-09 Cockerill Maintenance & Ingenierie Sa Installation de traitement thermique de produits chauds en defilement continu permettant la valorisation de l'energie extraite
CN108772428A (zh) * 2018-06-20 2018-11-09 重庆万达薄板有限公司 一种带钢冷轧机冷却水循环利用系统
CN110052382A (zh) * 2019-06-11 2019-07-26 鞍山发蓝股份公司 包装用钢带生产线涂漆烘干后的在线冷却装置
CN110607434A (zh) * 2019-09-05 2019-12-24 首钢京唐钢铁联合有限责任公司 一种退火炉炉压控制方法及装置
CN114904874B (zh) * 2021-05-08 2023-05-23 宜兴大平杆塔制造有限公司 一种镀锌车间用锌烟收集装置的使用方法

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WO2010012869A1 (fr) 2010-02-04
BRPI0822984A8 (pt) 2016-10-11
US20110186282A1 (en) 2011-08-04
EP2304060A1 (de) 2011-04-06
BRPI0822984B1 (pt) 2017-12-26
BRPI0822984A2 (pt) 2015-06-23

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