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EP0807187B1 - Method and device for cooling hot briquetted spongy iron - Google Patents

Method and device for cooling hot briquetted spongy iron Download PDF

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Publication number
EP0807187B1
EP0807187B1 EP96900197A EP96900197A EP0807187B1 EP 0807187 B1 EP0807187 B1 EP 0807187B1 EP 96900197 A EP96900197 A EP 96900197A EP 96900197 A EP96900197 A EP 96900197A EP 0807187 B1 EP0807187 B1 EP 0807187B1
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EP
European Patent Office
Prior art keywords
sponge iron
cooling
cooling medium
several
briquetted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP96900197A
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German (de)
French (fr)
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EP0807187A1 (en
Inventor
Leopold Werner Kepplinger
Gerhard Cip
Anton Himmel
Karl-Heinz Zimmerbauer
Roland Sachsenhofer
Roy Hubert Whipp, Jr.
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Primetals Technologies Austria GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
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Publication of EP0807187A1 publication Critical patent/EP0807187A1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0086—Conditioning, transformation of reduced iron ores

Definitions

  • the invention relates to a method for cooling hot briquetted sponge iron, and an apparatus for performing the method.
  • Hot briquetted sponge iron has to be safe with economically justifiable Effort to be transported and stored, one of the production of the Sponge iron are subjected to the following cooling as soon as possible.
  • DE-C - 29 35 707 From DE-C - 29 35 707 it is known to be called briquetted sponge iron cool that it is placed in a quenching tank in which it is brought to the desired Final temperature is cooled. In DE-C - 29 35 707 it is also mentioned that instead of Quenching tanks can also be provided with air cooling.
  • a disadvantage of these known submerged water cooling systems is that the mechanical parts used to transport the hot iron sponge briquettes alternately come into contact with hot water with a high solids, CO 2 and suspended matter content and ambient air, so that these parts are subject to very high wear.
  • the contact of the very hot sponge iron briquettes with cooling water creates the risk of water gas reactions. Due to the Leidenfrost phenomenon, which occurs very intensely in this high temperature range, water cooling is also not very efficient.
  • the insulating layer formed here from water vapor on the surface of the sponge iron briquettes has a severe deteriorating effect on the heat transfer in the high temperature range. Furthermore, the contact of the still hot iron sponge briquettes with the cooling water leads to a reduction in the product quality, etc.
  • the invention aims at avoiding these disadvantages and difficulties and presents itself the task, a method of the type described above and a device for Implementation of the process to create a trouble-free cooling process allow for optimal utilization of the capacity of the cooling device.
  • JP-A-06-316718 discloses iron briquettes in a first cooling stage Spray with cooling water and in a second stage with an even faster cooling To cool water. It is also known, first with a gas instead of water spray to cool, with this gas cooling the same high cooling speed as with Spray cooling is provided. The second cooling level is even faster cooling Water provided. From a further embodiment variant of JP-A-06-316718 known, first with inert gas, then with water spray and finally even faster to cool with water.
  • briquetted sponge iron should have a high product quality, one Formation of fine particles is avoided as possible during cooling.
  • the device for Implementation of the method should be subject to a low level of stress, and thus a have a long service life.
  • the briquetted sponge iron is preferably used during the second cooling step additionally flows through a gaseous cooling medium, which makes a special intensive contact of the sponge iron with the cooling medium succeeds.
  • the hot briquetted iron sponge is expediently opened during the first cooling step a temperature at least in the region of half the temperature of the hot Sponge iron, preferably cooled to a temperature below this temperature, which makes the use of the liquid cooling medium particularly efficient, especially since the Intensity with which the Leidenfrost phenomenon occurs and its isolation effect lower temperatures is much lower than at high temperatures.
  • the first cooling step is preferably carried out over a longer period of time than the second Cooling step, preferably over a period of more than 60% of the total cooling time, carried out.
  • the application is carried out according to a preferred embodiment gaseous cooling medium by pressing or by suction.
  • a preferred way of applying liquid to the bound iron sponge Cooling medium takes place by injecting the liquid cooling medium into an air stream. Also this enables an insulating effect due to itself on the surface of the Avoid spongy water vapor.
  • a preferred embodiment of the device is characterized in that the Edition of an endless conveyor belt, such as a plate belt, is formed, the upper Band strand is used to hold the hot briquetted sponge iron.
  • Another preferred embodiment has a support for the sponge iron as Circular cooler trained grid.
  • the gas guide device preferably also extends over the area of the spray nozzles.
  • Either single-substance nozzles or two-substance nozzles are used to apply the liquid cooling medium provided, the liquid cooling medium as well as gaseous cooling medium via the latter briquetted sponge iron can be fed.
  • Fig. 1 is a Cooling device according to the invention in a schematic representation in side view and Fig. 2nd the resulting basic temperature profile over the length of the cooling section illustrate.
  • Fig. 3 shows the structural design of an inventive Cooling device, also in side view.
  • the cooling device with a continuously and uniformly driven endless conveyor belt 1, such as one Plattenband, equipped, the upper band strand 2 as a support for hot Sponge iron briquettes 3 is used.
  • This sponge iron 3 is on the gas-permeable endless conveyor belt 1 appropriately applied in tape form, e.g. in a layer height 4 of about 200 mm and in a width corresponding to the bandwidth, e.g. about 1000 mm.
  • the iron sponge 3 is used to form the most uniform possible Sponge iron belt 9 in layers over the feed chutes 5.
  • the sponge iron belt 9 is then moved through an air cooling zone 11, in which the hot one Iron sponge 3 - it has a temperature TA in the range between 580 and 720 ° C
  • the cooling air is compressed by a compressor 12 and over an air guiding device 13 is fed to the upper belt run 2 in such a way that the air is forced is to flow through the sponge iron strip 9.
  • the cooling air system has a silencer, a volume flow control and not closer shown collection and distribution channels including the necessary shut-off devices and Controls on.
  • a water cooling zone 14 is provided in the approximately third third of the upper belt run 2, in which the sponge iron 3 by means of sprayed water to a surface temperature of about 85 ° C is intensively cooled.
  • the water is sprayed on via a distribution system 15 several spray nozzles 16, which are designed either as single-substance nozzles or as two-substance nozzles are. If two-substance nozzles are used, these are treated with treated water and compressed air.
  • the air supply also extends over the water cooling zone 14, so that in the water cooling zone 14 by an additional cooling effect Cooling air occurs.
  • the air pressed by the hot sponge iron 3 and the resulting steam are in a discharge hood 17 collected and with a suction, not shown Cleaning device derived.
  • FIG. 2 The particularly high efficiency of the cooling method according to the invention can be clearly seen from FIG. 2.
  • the full course of the line I shows the temperature profile on the surface of the sponge iron 3 over the length of the cooling device. It can be seen that the sponge iron 3 is gently and gently cooled in the air cooling zone 11, in which only air is used for cooling. Only when the sponge iron 3 has reached a temperature approximately in the region of half the initial temperature T A or below through the exclusive air cooling does the water cooling according to the invention begin, which causes a relatively abrupt and intensive cooling of the sponge iron 3 in comparison to the air cooling.
  • T E The final temperature of the sponge iron 3 reached after a relatively short cooling time
  • the dashed line II in FIG. 2 illustrates the temperature profile of the sponge iron 3, which would occur over the entire length of the upper belt run 2 if only air cooling was used.
  • the final temperature T " E of the sponge iron which is achieved in this case is clearly above the final temperature T E achieved according to the invention.
  • the device In order to be able to reach the final temperature T E according to the invention exclusively with air cooling, the device would have to extend over a substantially greater length and / or the air throughput would have to be quantitative significantly increased or the layer height 4 of the sponge iron strip 9 and thus the specific throughput can be reduced.
  • a dashed line III in FIG. 2 illustrates a cooling curve that would result from a cooling of the sponge iron 3 if this sponge iron 3 is sprayed in an initial area exclusively with liquid cooling medium, ie cooling water. It can be seen that initially a more abrupt cooling takes place than with air, but that due to the occurrence of the Leidenfrost phenomenon, the effectiveness of the cooling does not reach that of the cooling effect according to the invention, ie the final temperature T " E which can only be achieved with liquid cooling medium is also above the final temperature T E achieved according to the invention, so here too the cooling device would have to be designed longer or the sponge iron would be exposed to cooling medium for a longer time.
  • the invention is not limited to the embodiment shown in the drawing, but can be modified in various ways.
  • the endless conveyor belt 1 it is possible instead of the endless conveyor belt 1 to provide a round cooler by one gas permeable grate is formed and which rotates slowly, the one on the grate sponge iron applied during a rotation of the grate, for example by 260 °, is cooled by means of cooling air and then by means of cooling water.
  • the air supply alone in the air cooling zone 11 and in the Subsequent water cooling zone 14 to work exclusively with one or two-substance nozzles.
  • the cooling air can be sucked or pressed from below or from above through the Sponge iron belt 9 are passed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacture Of Iron (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Abkühlen von heißem brikettiertem Eisenschwamm, sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for cooling hot briquetted sponge iron, and an apparatus for performing the method.

Heißer brikettierter Eisenschwamm muß, um gefahrlos mit wirtschaftlich vertretbarem Aufwand transportiert und gelagert werden zu können, einer der Herstellung des Eisenschwammes möglichst umgehend folgenden Abkühlung unterzogen werden.Hot briquetted sponge iron has to be safe with economically justifiable Effort to be transported and stored, one of the production of the Sponge iron are subjected to the following cooling as soon as possible.

Zur Abkühlung von heißem gebranntem Material, beispielsweise Sinter oder Pellets, ist es bekannt (AT-B - 358.617), das heiße Material durch einen Schachtkühler zu führen und im Gegenstrom Kühlluft durch den Schachtkühler zu leiten. Für eine effiziente Abkühlung des Materials bis zur gewünschten Endtemperatur, beispielsweise zwischen 70 und 80°C, ist es erforderlich, eine große Menge von Kühlluft durch den Schachtkühler zu drücken, wofür ein hoher Energieaufwand erforderlich ist. Weiters kommt es durch die dabei auftretenden hohen Luftgeschwindigkeiten zu einem verstärkten Abführen von Material mit der aus dem Schachtkühler austretenden Kühlluft, insbesondere wenn dieses nur eine geringe Korngröße aufweist.It is for cooling hot fired material, such as sinter or pellets known (AT-B - 358.617) to pass the hot material through a shaft cooler and in Countercurrent cooling air through the shaft cooler. For an efficient cooling of the It is material up to the desired final temperature, for example between 70 and 80 ° C required to push a large amount of cooling air through the shaft cooler, which is why high energy expenditure is required. It also comes through the highs that occur Air velocities to an increased removal of material with the from the Shaft cooler exiting cooling air, especially if this is only a small grain size having.

Aus der DE-C - 29 35 707 ist es bekannt, heißen brikettierten Eisenschwamm dadurch abzukühlen, daß er in einen Abschrecktank eingebracht wird, in dem er auf die gewünschte Endtemperatur abgekühlt wird. In der DE-C - 29 35 707 ist weiters erwähnt, daß anstelle des Abschrecktanks auch eine Luftkühlung vorgesehen sein kann.From DE-C - 29 35 707 it is known to be called briquetted sponge iron cool that it is placed in a quenching tank in which it is brought to the desired Final temperature is cooled. In DE-C - 29 35 707 it is also mentioned that instead of Quenching tanks can also be provided with air cooling.

Aus der DE-C - 29 28 501 und der DE-C - 26 25 223 ist es weiters bekannt heißen brikettierten Eisenschwamm durch einen Abschrecktank mit Hilfe eines Förderbandes zu führen, wobei die Eisenschwammbriketts, die mit einer Temperatur von 550 bis 700°C anfallen, auf etwa 80 bis 90°C abgekühlt werden. Nach Herausführen der Eisenschwammbriketts aus dem Abschrecktank trocknen dieselben durch die in ihrem Inneren vorhandene Restwärme auf.It is also known from DE-C - 29 28 501 and DE-C - 26 25 223 guiding the briquetted sponge iron through a quenching tank using a conveyor belt, the sponge iron briquettes, which are obtained at a temperature of 550 to 700 ° C, on about 80 to 90 ° C are cooled. After removing the sponge iron briquettes from the Quenching tanks dry them up by the residual heat inside them.

Nachteilig bei diesen bekannten Tauch-Wasserkühlungen ist, daß die dem Transport der heißen Eisenschwammbriketts dienenden mechanischen Teile abwechselnd in Kontakt mit heißem Wasser mit hohem Fest-, CO2- und Schwebstoffgehalt und Umgebungsluft treten, so daß diese Teile einem sehr hohen Verschleiß unterliegen. Durch den Kontakt der sehr heißen Eisenschwammbriketts mit Kühlwasser ergibt sich die Gefahr von Wassergasreaktionen. Die Wasserkühlung ist infolge des Leidenfrost'schen Phänomens, das in diesem hohen Temperaturbereich sehr intensiv auftritt, zudem wenig effizient. Die hierbei aus Wasserdampf gebildete Isolierschicht an der Oberfläche der Eisenschwammbriketts wirkt sich im hohen Temperaturbereich stark verschlechternd auf den Wärmeübergang aus. Weiters kommt es durch den Kontakt der noch heißen Eisenschwammbriketts mit dem Kühlwasser zu einer Verminderung der Produktqualität, u.zw. durch Abplatzen von Material der Eisenschwammbriketts. Hierdurch fällt sehr viel Feinmaterial an, welches der Funktion mechanisch bewegter Teile von Förderanlagen etc. abträglich ist und bei der weiteren Verarbeitung der Eisenschwammbriketts oft ebenfalls unerwünscht ist, insbesondere bei der weiteren Verarbeitung der Eisenschwammbriketts.A disadvantage of these known submerged water cooling systems is that the mechanical parts used to transport the hot iron sponge briquettes alternately come into contact with hot water with a high solids, CO 2 and suspended matter content and ambient air, so that these parts are subject to very high wear. The contact of the very hot sponge iron briquettes with cooling water creates the risk of water gas reactions. Due to the Leidenfrost phenomenon, which occurs very intensely in this high temperature range, water cooling is also not very efficient. The insulating layer formed here from water vapor on the surface of the sponge iron briquettes has a severe deteriorating effect on the heat transfer in the high temperature range. Furthermore, the contact of the still hot iron sponge briquettes with the cooling water leads to a reduction in the product quality, etc. by flaking off sponge briquette material. This results in a great deal of fine material which is detrimental to the function of mechanically moving parts of conveyor systems etc. and is often also undesirable in the further processing of the sponge iron briquettes, in particular in the further processing of the sponge iron briquettes.

Aus der DE-C - 29 28 501 ist es weiters bekannt, ein Brikettband auf einen Förderer aufzugeben und mit Flüssigkeit zu besprühen, wodurch das Brikettband auf eine Temperatur im Bereich von 250 bis 350°C abkühlt. Auch hierbei kommt es zu den oben beschriebenen Nachteilen, nämlich zu Wassergasreaktionen, zum Auftreten des Leidenfrost'schen Phänomens und damit zu ungleichmäßiger und unzureichender Kühlung sowie zu thermischen Spannungen und dadurch bedingt zu Abplatzungen.From DE-C - 29 28 501 it is also known to put a briquette tape on a conveyor give up and sprayed with liquid, bringing the briquette tape to a temperature cools in the range of 250 to 350 ° C. This also leads to the ones described above Disadvantages, namely to water gas reactions, to the occurrence of Leidenfrost Phenomenon and thus to uneven and inadequate cooling as well thermal tensions and chipping.

Die Erfindung bezweckt die Vermeidung dieser Nachteile und Schwierigkeiten und stellt sich die Aufgabe, ein Verfahren der eingangs beschriebenen Art sowie eine Vorrichtung zur Durchführung des Verfahrens zu schaffen, welche einen störungsfreien Ablauf der Kühlung bei optimaler Ausnutzung der Kapazität der Kühleinrichtung ermöglichen.The invention aims at avoiding these disadvantages and difficulties and presents itself the task, a method of the type described above and a device for Implementation of the process to create a trouble-free cooling process allow for optimal utilization of the capacity of the cooling device.

Aus der JP-A - 06-316718 ist bekannt, Eisenbriketts in einer ersten Kühlstufe durch Besprühen mit Kühlwasser und in einer zweiten Stufe durch eine noch schnellere Kühlung mit Wasser zu kühlen. Weiters ist bekannt, zunächst mit einem Gas anstelle der Wassersprühung zu kühlen, wobei bei dieser Gaskühlung eine gleich hohe Kühlgeschwindigkeit wie bei Sprühkühlung vorgesehen ist. Als zweite Kühlstufe ist eine noch schnellere Kühlung mit Wasser vorgesehen. Aus einer weiteren Ausführungsvariante der JP-A - 06-316718 ist bekannt, zunächst mit inertem Gas, sodann mit Sprühwasser und schließlich noch schneller mit Wasser zu kühlen.JP-A-06-316718 discloses iron briquettes in a first cooling stage Spray with cooling water and in a second stage with an even faster cooling To cool water. It is also known, first with a gas instead of water spray to cool, with this gas cooling the same high cooling speed as with Spray cooling is provided. The second cooling level is even faster cooling Water provided. From a further embodiment variant of JP-A-06-316718 known, first with inert gas, then with water spray and finally even faster to cool with water.

Erfindungsgemäß soll insbesondere eine Einsparung von Kühlmittel gegenüber herkömmlichen Verfahren durch eine besonders effiziente Verwendung desselben möglich sein. Der brikettierte Eisenschwamm soll eine hohe Produktqualität aufweisen, wobei eine Bildung von Feinteilen während des Kühlens möglichst unterbleibt. Die Vorrichtung zur Durchführung des Verfahrens soll einer geringen Beanspruchung unterliegen und damit eine hohe Lebensdauer aufweisen. According to the invention, savings in coolant are to be compared in particular conventional methods through a particularly efficient use of the same be. The briquetted sponge iron should have a high product quality, one Formation of fine particles is avoided as possible during cooling. The device for Implementation of the method should be subject to a low level of stress, and thus a have a long service life.

Diese Aufgabe wird erfindungsgemäß durch die Kombination folgender Merkmale gelöst:

  • der heiße brikettierte Eisenschwamm wird in Bandform mehrlagig geschichtet, vorzugsweise in einer Höhe von etwa 200 mm,
  • der heiße brikettierte Eisenschwamm wird in einem ersten Kühlschritt ausschließlich von einem gasförmigen Kühlmedium, vorzugsweise Kühlluft, durchströmt und währenddessen schonend gekühlt,
  • worauf in einem zweiten Kühlschritt der brikettierte Eisenschwamm mit einem flüssigen Kühlmedium, vorzugsweise Kühlwasser, besprüht wird und so intensiv auf die gewünschte Endtemperatur unter Ausschluß einer Tauchkühlung gekühlt wird.
This object is achieved according to the invention by combining the following features:
  • the hot briquetted sponge iron is layered in layers in the form of a strip, preferably at a height of about 200 mm,
  • In a first cooling step, the hot briquetted sponge iron is flowed through exclusively by a gaseous cooling medium, preferably cooling air, and is gently cooled in the meantime.
  • whereupon in a second cooling step the briquetted sponge iron is sprayed with a liquid cooling medium, preferably cooling water, and is thus intensively cooled to the desired final temperature with the exception of immersion cooling.

Hierbei wird vorzugsweise während des zweiten Kühlschrittes der brikettierte Eisenschwamm zusätzlich von einem gasförmigen Kühlmedium durchströmt, wodurch ein besonders intensiver Kontakt des Eisenschwammes mit dem Kühlmedium gelingt.The briquetted sponge iron is preferably used during the second cooling step additionally flows through a gaseous cooling medium, which makes a special intensive contact of the sponge iron with the cooling medium succeeds.

Zweckmäßig wird der heiße brikettierte Eisenschwamm während des ersten Kühlschrittes auf eine Temperatur mindestens im Bereich der Hälfte der Temperatur des heißen Eisenschwammes, vorzugsweise auf eine Temperatur unterhalb dieser Temperatur, gekühlt, wodurch der Einsatz des flüssigen Kühlmediums besonders effizient wird, vor allem da die Intensität, mit der das Leidenfrost'sche Phänomen auftritt, und dessen Isolienvirkung bei tieferen Temperaturen wesentlich geringer ist als bei hohen Temperaturen.The hot briquetted iron sponge is expediently opened during the first cooling step a temperature at least in the region of half the temperature of the hot Sponge iron, preferably cooled to a temperature below this temperature, which makes the use of the liquid cooling medium particularly efficient, especially since the Intensity with which the Leidenfrost phenomenon occurs and its isolation effect lower temperatures is much lower than at high temperatures.

Vorzugsweise wird der erste Kühlschritt über eine größere Zeitdauer als der zweite Kühlschritt, vorzugsweise über eine Zeitdauer von mehr als 60 % der Gesamtkühlzeit, durchgeführt.The first cooling step is preferably carried out over a longer period of time than the second Cooling step, preferably over a period of more than 60% of the total cooling time, carried out.

Um einen besonders guten Kontakt des gasförmigen Kühlmediums mit dem Eisenschwamm zu erzielen, erfolgt gemäß einer bevorzugten Ausführungsform die Beaufschlagung mit gasförmigem Kühlmedium durch Drücken oder durch Saugen.To ensure particularly good contact between the gaseous cooling medium and the sponge iron To achieve, the application is carried out according to a preferred embodiment gaseous cooling medium by pressing or by suction.

Eine bevorzugte Art der Beaufschlagung des bnkettierten Eisenschwammes mit flüssigem Kühlmedium erfolgt durch Eindüsen des flüssigen Kühlmediums in einen Luftstrom. Auch hierdurch gelingt es, einen Isoliereffekt aufgrund von sich an der Oberfläche des Eisenschwammes bildendem Wasserdampf weitgehend zu vermeiden.A preferred way of applying liquid to the bound iron sponge Cooling medium takes place by injecting the liquid cooling medium into an air stream. Also this enables an insulating effect due to itself on the surface of the Avoid spongy water vapor.

Um die Staubbelastung der Kühlluft zu verringern und zur Schonung der Vorrichtung wird vorteilhaft vor dem ersten Kühlschritt eine Staubabsaugung durchgeführt. To reduce the dust pollution of the cooling air and to protect the device dust extraction is advantageously carried out before the first cooling step.

Eine Vorrichtung zur Durchführung des Verfahrens ist durch die Kombination nachfolgender Merkmale gekennzeichnet:

  • eine gasdurchlässige Auflage für den brikettierten Eisenschwamm, mit der der Eisenschwamm durch die Vorrichtung bewegbar ist,
  • eine die Auflage zumindest teilweise umgebende Gasleiteinrichtung zum Zuführen eines gasförmigen Kühlmediums zum bnkettierten Eisenschwamm,
  • Sprühdüsen zum Aufsprühen eines flüssigen Kühlmediums auf den brikettierten Eisenschwamm, wobei
  • die Sprühdüsen erst in der zweiten Hälfte - in Bewegungsrichtung der den Eisenschwamm mitnehmenden Auflage gesehen - der ohne Tauchkühleinrichtung gestalteten Vorrichtung angeordnet sind.
A device for performing the method is characterized by the combination of the following features:
  • a gas-permeable support for the briquetted sponge iron, with which the sponge iron can be moved through the device,
  • a gas guide device at least partially surrounding the support for supplying a gaseous cooling medium to the embedded iron sponge,
  • Spray nozzles for spraying a liquid cooling medium onto the briquetted sponge iron, whereby
  • the spray nozzles are only arranged in the second half - seen in the direction of movement of the support that carries the sponge iron - of the device designed without an immersion cooling device.

Eine bevorzugte Ausführungsform der Vorrichtung ist dadurch gekennzeichnet, daß die Auflage von einem Endlos-Förderband, wie einem Plattenband, gebildet ist, dessen oberes Bandtrum zur Aufnahme des heißen brikettierten Eisenschwammes dient.A preferred embodiment of the device is characterized in that the Edition of an endless conveyor belt, such as a plate belt, is formed, the upper Band strand is used to hold the hot briquetted sponge iron.

Eine weitere bevorzugte Ausführungsform weist als Auflage für den Eisenschwamm einen als Rundkühler ausgebildeten Gitterrost auf.Another preferred embodiment has a support for the sponge iron as Circular cooler trained grid.

Vorzugsweise erstreckt sich die Gasleiteinrichtung auch über den Bereich der Sprühdüsen.The gas guide device preferably also extends over the area of the spray nozzles.

Zweckmäßig durchläuft die den Eisenschwamm aufnehmende Auflage nach Aufbringen des Eisenschwammes und vor Eintritt in die Gasleiteinrichtung eine Staubabsaugeinrichtung.Appropriately passes through the pad that holds the sponge iron after application of the Sponge iron and a dust extraction device before entering the gas guide device.

Zur Aufbringung des flüssigen Kühlmediums sind entweder Einstoffdüsen oder Zweistoffdüsen vorgesehen, wobei über letztere flüssiges Kühlmedium als auch gasförmiges Kühlmedium dem brikettierten Eisenschwamm zuführbar ist.Either single-substance nozzles or two-substance nozzles are used to apply the liquid cooling medium provided, the liquid cooling medium as well as gaseous cooling medium via the latter briquetted sponge iron can be fed.

Die Erfindung ist nachfolgend anhand der Zeichnung näher erläutert, wobei Fig. 1 eine erfindungsgemäße Kühlvorrichtung in schematischer Darstellung in Seitenansicht und Fig. 2 den sich hierbei einstellenden prinzipiellen Temperaturverlauf über die Länge der Kühlstrecke veranschaulichen. Fig. 3 zeigt die konstruktive Ausgestaltung einer erfindungsgemäßen Kühlvorrichtung, ebenfalls in Seitenansicht.The invention is explained in more detail below with reference to the drawing, in which Fig. 1 is a Cooling device according to the invention in a schematic representation in side view and Fig. 2nd the resulting basic temperature profile over the length of the cooling section illustrate. Fig. 3 shows the structural design of an inventive Cooling device, also in side view.

Gemäß der in der Zeichnung, Fig. 1, dargestellten Ausführungsform ist die Kühlvorrichtung mit einem kontinuierlich und gleichförmig angetriebenen Endlos-Förderband 1, wie einem Plattenband, ausgestattet, dessen oberes Bandtrum 2 als Auflage für heiße Eisenschwammbriketts 3 dient. Dieser Eisenschwamm 3 wird auf das gasdurchlässige Endlos-Förderband 1 zweckmäßig in Bandform aufgebracht, z.B. in einer Schichthöhe 4 von etwa 200 mm und in einer Breite entsprechend der Bandbreite, wie z.B. etwa 1000 mm. Die Aufgabe des Eisenschwammes 3 erfolgt zur Bildung eines möglichst gleichförmigen Eisenschwammbandes 9 mehrlagig über die Aufgabeschurren 5.According to the embodiment shown in the drawing, Fig. 1, the cooling device with a continuously and uniformly driven endless conveyor belt 1, such as one Plattenband, equipped, the upper band strand 2 as a support for hot Sponge iron briquettes 3 is used. This sponge iron 3 is on the gas-permeable endless conveyor belt 1 appropriately applied in tape form, e.g. in a layer height 4 of about 200 mm and in a width corresponding to the bandwidth, e.g. about 1000 mm. The The iron sponge 3 is used to form the most uniform possible Sponge iron belt 9 in layers over the feed chutes 5.

Bei Bewegen des Eisenschwammes 3 in Richtung des Pfeiles 6 durch Mitnahme mit dem Endlos-Förderband 1 wird dieses zunächst durch eine Entstaubungszone 7 geführt. die eine an eine Staubabsaugung 8 angeschlossene, das Eisenschwammband 9 überdeckende Haube 10 aufweist. In der Entstaubungszone wird das an den Oberflächen der Eisenschwammteilchen, wie z.B. an den Brikettoberflächen, haftende feine Material abgesaugt. When moving the sponge iron 3 in the direction of arrow 6 by taking it with you Endless conveyor belt 1, this is first passed through a dedusting zone 7. the one at a dust extractor 8 connected hood 10 covering the iron sponge belt 9 having. In the dedusting zone, this is on the surfaces of the sponge iron particles, such as. sucked off on the briquette surfaces, adhering fine material.

Danach wird das Eisenschwammband 9 durch eine Luftkühlzone 11 bewegt, in der der heiße Eisenschwamm 3 - es weist eine Temperatur TA im Bereich zwischen 580 und 720°C beim Aufbringen auf das Endlos-Förderband 1 auf - ausschließlich mit Hilfe von Kühlluft, gemäß Fig. 1 mit Hilfe von durch das Eisenschwammband 9 von unten gedrückter Kühlluft, auf ca. 350°C abgekühlt wird. Die Kühlluft wird mittels eines Kompressors 12 verdichtet und über eine Luftleiteinrichtung 13 dem oberen Bandtrum 2 derart zugeführt, daß die Luft gezwungen ist, das Eisenschwammband 9 zu durchströmen.The sponge iron belt 9 is then moved through an air cooling zone 11, in which the hot one Iron sponge 3 - it has a temperature TA in the range between 580 and 720 ° C Apply to the endless conveyor belt 1 - only with the help of cooling air, according to 1 with the aid of cooling air pressed through the iron sponge belt 9 from below to approx. 350 ° C is cooled. The cooling air is compressed by a compressor 12 and over an air guiding device 13 is fed to the upper belt run 2 in such a way that the air is forced is to flow through the sponge iron strip 9.

Das Kühlluftsystem weist einen Schalldämpfer, eine Volumensstromregelung sowie nicht näher dargestellte Sammel- und Verteilkanäle inklusive der erforderlichen Absperreinrichtungen und Steuereinrichtungen auf.The cooling air system has a silencer, a volume flow control and not closer shown collection and distribution channels including the necessary shut-off devices and Controls on.

Im etwa dritten Drittel des oberen Bandtrums 2 ist eine Wasserkühlzone 14 vorgesehen, in der der Eisenschwamm 3 mittels aufgesprühtem Wasser auf eine Oberflächentemperatur von etwa 85°C intensiv gekühlt wird. Die Wasseraufsprühung erfolgt über ein Verteilsystem 15 über mehrere Sprühdüsen 16, die entweder als Einstoffdüsen oder als Zweistoffdüsen ausgebildet sind. Im Falle der Verwendung von Zweistoffdüsen werden diese mit aufbereitetem Wasser und Druckluft gespeist.A water cooling zone 14 is provided in the approximately third third of the upper belt run 2, in which the sponge iron 3 by means of sprayed water to a surface temperature of about 85 ° C is intensively cooled. The water is sprayed on via a distribution system 15 several spray nozzles 16, which are designed either as single-substance nozzles or as two-substance nozzles are. If two-substance nozzles are used, these are treated with treated water and compressed air.

Gemäß der in Fig. 1 dargestellten Ausführungsform erstreckt sich die Luftzuführung auch über die Wasserkühlzone 14, so daß in der Wasserkühlzone 14 eine zusätzliche Kühlwirkung durch Kühlluft auftritt.According to the embodiment shown in Fig. 1, the air supply also extends over the water cooling zone 14, so that in the water cooling zone 14 by an additional cooling effect Cooling air occurs.

Die durch den heißen Eisenschwamm 3 gedrückte Luft und entstehender Dampf werden in einer Ableitungshaube 17 gesammelt und über eine nicht näher dargestellte Absaugung mit Reinigungseinrichtung abgeleitet.The air pressed by the hot sponge iron 3 and the resulting steam are in a discharge hood 17 collected and with a suction, not shown Cleaning device derived.

Nachdem der Eisenschwamm 3 das Endlos-Förderband 1 verlassen hat und über eine Austragsschurre 18 weitergefördert wird, erfolgt das Abtrocknen des Eisenschwammes 3 durch die in ihm noch verbliebene Restwärme.After the sponge iron 3 has left the endless conveyor belt 1 and over a Discharge chute 18 is conveyed further, the sponge iron 3 dries off due to the residual heat remaining in it.

Anhand der Fig. 2 ist die besonders hohe Effizienz des erfindungsgemäßen Kühlverfahrens deutlich zu ersehen. Mit voller ununterbrochener Linie I ist der Temperaturverlauf an der Oberfläche des Eisenschwammes 3 über die Länge der Kühlvorrichtung dargestellt. Es ist ersichtlich, daß der Eisenschwamm 3 in der Luftkühlzone 11, in der ausschließlich mit Luft gekühlt wird, eine sanfte und schonende Abkühlung erfährt. Erst wenn der Eisenschwamm 3 eine Temperatur etwa im Bereich der Hälfte der Ausgangstemperatur TA oder darunter durch die ausschließliche Luftkühlung erreicht hat, setzt erfindungsgemäß die Wasserkühlung ein, die eine im Vergleich zur Luftkühlung verhältnismäßig schroffe und intensive Kühlung des Eisenschwammes 3 bewirkt. Die hierdurch nach relativ kurzer Kühlzeit erreichte Endtemperatur des Eisenschwammes 3 ist mit TE bezeichnet.The particularly high efficiency of the cooling method according to the invention can be clearly seen from FIG. 2. The full course of the line I shows the temperature profile on the surface of the sponge iron 3 over the length of the cooling device. It can be seen that the sponge iron 3 is gently and gently cooled in the air cooling zone 11, in which only air is used for cooling. Only when the sponge iron 3 has reached a temperature approximately in the region of half the initial temperature T A or below through the exclusive air cooling does the water cooling according to the invention begin, which causes a relatively abrupt and intensive cooling of the sponge iron 3 in comparison to the air cooling. The final temperature of the sponge iron 3 reached after a relatively short cooling time is designated T E.

Mit strichlierter Linie II ist in Fig. 2 der Temperaturverlauf des Eisenschwammes 3 veranschaulicht, der bei ausschließlicher Luftkühlung über die Gesamtlänge des oberen Bandtrums 2 eintreten würde. Die hierbei erzielte Endtemperatur T"E des Eisenschwammes liegt deutlich über der erfindungsgemäß erzielten Endtemperatur TE. Um ausschließlich mit Luftkühlung die erfindungsgemäße Endtemperatur TE erreichen zu können, müßte sich die Vorrichtung über eine wesentlich größere Länge erstrecken und/oder es müßte der Luftdurchsatz mengenmäßig wesentlich erhöht bzw. die Schichthöhe 4 des Eisenschwammbandes 9 und damit die spezifische Durchsatzmenge vermindert werden.The dashed line II in FIG. 2 illustrates the temperature profile of the sponge iron 3, which would occur over the entire length of the upper belt run 2 if only air cooling was used. The final temperature T " E of the sponge iron which is achieved in this case is clearly above the final temperature T E achieved according to the invention. In order to be able to reach the final temperature T E according to the invention exclusively with air cooling, the device would have to extend over a substantially greater length and / or the air throughput would have to be quantitative significantly increased or the layer height 4 of the sponge iron strip 9 and thus the specific throughput can be reduced.

Mit strichpunktierter Linie III ist in Fig. 2 eine Abkühlkurve veranschaulicht, die sich bei einer Kühlung des Eisenschwammes 3 ergeben würde, wenn dieser Eisenschwamm 3 in einem Anfangsbereich ausschließlich mit flüssigem Kühlmedium, d.h. Kühlwasser, besprüht wird. Es ist zu erkennen, daß zunächst eine schroffere Abkühlung als mit Luft stattfindet, daß jedoch infolge des Auftretens des Leidenfrost'schen Phänomens im verstärkten Ausmaß die Effektivität der Kühlung nicht die der erfindungsgemäßen Kühlwirkung erreicht, d.h. die ausschließlich mit flüssigem Kühlmedium erzielbare Endtemperatur T"E liegt ebenfalls über der erfindungsgemäß erzielten Endtemperatur TE; also müßte auch hier die Kühlvorrichtung länger gestaltet sein bzw. der Eisenschwamm längere Zeit mit Kühlmedium beaufschlagt werden.A dashed line III in FIG. 2 illustrates a cooling curve that would result from a cooling of the sponge iron 3 if this sponge iron 3 is sprayed in an initial area exclusively with liquid cooling medium, ie cooling water. It can be seen that initially a more abrupt cooling takes place than with air, but that due to the occurrence of the Leidenfrost phenomenon, the effectiveness of the cooling does not reach that of the cooling effect according to the invention, ie the final temperature T " E which can only be achieved with liquid cooling medium is also above the final temperature T E achieved according to the invention, so here too the cooling device would have to be designed longer or the sponge iron would be exposed to cooling medium for a longer time.

Zusätzlich stellt sich hier noch die Gefahr der Bildung von Wassergasreaktionen sowie eine Verminderung der Produktqualität ein, da die schroffe Abkühlung im hohen Temperaturbereich TA für bestimmte Produkte, wie z.B. bei Eisenschwamm, zu Abplatzungen und damit zur Bildung von Feinanteilen in unzulässigem Ausmaß führen kann.In addition, there is also the risk of water gas reactions and a reduction in product quality, since the abrupt cooling in the high temperature range T A for certain products, such as sponge iron, can lead to spalling and thus to the formation of fine particles to an unacceptable extent.

Die Erfindung beschränkt sich nicht auf das in der Zeichnung dargestellte Ausführungsbeispiel, sondern kann in verschiedener Hinsicht modifiziert werden. Beispielsweise ist es möglich, anstelle des Endlos-Förderbandes 1 einen Rundkühler vorzusehen, der von einem gasdurchlässigen Rost gebildet ist und der sich langsam dreht, wobei der auf dem Rost aufgebrachte Eisenschwamm während einer Drehung des Rostes, beispielsweise um 260°, mittels Kühlluft und anschließend mittels Kühlwasser gekühlt wird. Weiters ist es auch möglich, die Luftzuführung alleine in der Luftkühlzone 11 durchzuführen und in der anschließenden Wasserkühlzone 14 ausschließlich mit Ein - oder Zweistoffdüsen zu arbeiten. The invention is not limited to the embodiment shown in the drawing, but can be modified in various ways. For example, it is possible instead of the endless conveyor belt 1 to provide a round cooler by one gas permeable grate is formed and which rotates slowly, the one on the grate sponge iron applied during a rotation of the grate, for example by 260 °, is cooled by means of cooling air and then by means of cooling water. Furthermore, it is possible to carry out the air supply alone in the air cooling zone 11 and in the Subsequent water cooling zone 14 to work exclusively with one or two-substance nozzles.

Die Kühlluft kann durch Saugen oder Drücken von unten oder von oben durch das Eisenschwammband 9 geleitet werden.The cooling air can be sucked or pressed from below or from above through the Sponge iron belt 9 are passed.

Claims (14)

  1. A method of cooling hot briquetted sponge iron (3), characterized by the combination of the following characteristic features:
    the hot briquetted sponge iron (3) is disposed in strip form in several layers, preferably at a height of roughly 200 mm,
    the hot briquetted sponge iron (3), in a first cooling step, is passed exclusively by a gaseous cooling medium, preferably cooling air, while being gently cooled,
    whereupon, in a second cooling step, the briquetted sponge iron (3) is sprayed with a liquid cooling medium, preferably cooling water, thus being intensively cooled to the desired final temperature (TE) under the exclusion of immersion cooling.
  2. A method according to claim 1, characterized in that the briquetted sponge iron (3), during the second cooling step, additionally is passed by a gaseous cooling medium.
  3. A method according to claim 1 or 2, characterized in that the hot sponge iron (3), during the first cooling step, is cooled to a temperature amounting to at least half the temperature (TA) of the hot sponge iron, preferably to a temperature below this temperature.
  4. A method according to one or several of claims 1 to 3, characterized in that the first cooling step is carried out over a longer period of time than the second cooling step, preferably over a period of time of more than 60 % of the overall cooling time.
  5. A method according to one or several of claims 1 to 4, characterized in that feeding of gaseous cooling medium is effected by pressing or sucking.
  6. A method according to one or several of claims 2 to 5, characterized in that feeding of liquid cooling medium is effected by injecting said liquid cooling medium into an air flow through nozzles.
  7. A method according to one or several of claims 1 to 6, characterized in that dust collection by exhaust ventilation is carried out prior to the first cooling step.
  8. An arrangement for carrying out the method according to one or several of claims 1 to 7, characterized by the combination of the following characteristic features:
    a gas-permeable support (2) for the briquetted sponge iron (3), by which the sponge iron (3) is capable of being moved through the arrangement,
    a gas conduction means (13, 17) at least partially surrounding the support (2) and destined for supplying a gaseous cooling medium to the sponge iron (3),
    spraying nozzles (16) for spraying a liquid cooling medium on the sponge iron (3),
    the spraying nozzles (16) being arranged only in the second half- viewed in the direction of movement of the support (2) entraining the sponge iron (3) - of the arrangement constructed without an immersion cooling device.
  9. An arrangement according to claim 8, characterized in that the support is comprised of a continuous conveying belt (1), such as a plate belt, whose upper belt side (2) serves to receive the hot briquetted sponge iron (3).
  10. An arrangement according to claim 8, characterized in that the support (2) is comprised of a grating designed as a rotary cooler.
  11. An arrangement according to one or several of claims 8 to 10, characterized in that the gas conduction means (13, 17) also extends over the area of the spraying nozzles (16).
  12. An arrangement according to one or several of claims 8 to 11, characterized in that the support (2) receiving the sponge iron (3) passes through a dust extraction means (8, 10) after charging of the sponge iron (3) and before entry into the gas conduction means (13, 17).
  13. An arrangement according to one or several of claims 8 to 12, characterized in that mono-component nozzles (16) are provided for applying said liquid cooling medium.
  14. An arrangement according to one or several of claims 8 to 13, characterized in that two-component nozzles (16) are provided for applying said liquid cooling medium, through which both liquid cooling medium and gaseous cooling medium are feedable to the sponge iron (3).
EP96900197A 1995-01-23 1996-01-22 Method and device for cooling hot briquetted spongy iron Expired - Lifetime EP0807187B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0010695A AT404361B (en) 1995-01-23 1995-01-23 METHOD AND DEVICE FOR COOLING HOT IRON SPONGE
AT106/95 1995-02-28
PCT/AT1996/000008 WO1996023081A1 (en) 1995-01-23 1996-01-22 Method and device for cooling hot briquetted spongy iron

Publications (2)

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EP0807187A1 EP0807187A1 (en) 1997-11-19
EP0807187B1 true EP0807187B1 (en) 1998-08-12

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EP (1) EP0807187B1 (en)
JP (1) JP4006022B2 (en)
KR (1) KR100383351B1 (en)
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AT (1) AT404361B (en)
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AU4379596A (en) 1996-08-14
ATA10695A (en) 1998-03-15
EP0807187A1 (en) 1997-11-19
CO4560387A1 (en) 1998-02-10
ZA96468B (en) 1996-08-28
AR000749A1 (en) 1997-08-06
RU2142517C1 (en) 1999-12-10
DE59600430D1 (en) 1998-09-17
JPH11500782A (en) 1999-01-19
JP4006022B2 (en) 2007-11-14
EG21043A (en) 2000-09-30
PE38296A1 (en) 1996-09-25
BR9606929A (en) 1997-11-11
MX9705465A (en) 1998-07-31
KR100383351B1 (en) 2003-07-18
WO1996023081A1 (en) 1996-08-01
CA2211021A1 (en) 1996-08-01
KR19980701673A (en) 1998-06-25
AU703991B2 (en) 1999-04-01
AT404361B (en) 1998-11-25
CA2211021C (en) 2002-01-01

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