WO2004012916A1 - Method and device for providing cooled fresh concrete - Google Patents

Method and device for providing cooled fresh concrete Download PDF

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Publication number
WO2004012916A1
WO2004012916A1 PCT/EP2003/008200 EP0308200W WO2004012916A1 WO 2004012916 A1 WO2004012916 A1 WO 2004012916A1 EP 0308200 W EP0308200 W EP 0308200W WO 2004012916 A1 WO2004012916 A1 WO 2004012916A1
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WO
WIPO (PCT)
Prior art keywords
silo
line
cooling medium
coolant
temperature
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Application number
PCT/EP2003/008200
Other languages
German (de)
French (fr)
Inventor
Alexander Buinger
Original Assignee
Linde Aktiengesellschaft
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Publication date
Application filed by Linde Aktiengesellschaft filed Critical Linde Aktiengesellschaft
Priority to AU2003253324A priority Critical patent/AU2003253324A1/en
Publication of WO2004012916A1 publication Critical patent/WO2004012916A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/30—Mixing gases with solids
    • B01F23/39—Mixing systems, i.e. flow charts or diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/91—Heating or cooling systems using gas or liquid injected into the material, e.g. using liquefied carbon dioxide or steam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/0007—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust
    • B28C7/0023—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust by heating or cooling
    • B28C7/0038—Cooling, e.g. using ice

Definitions

  • the invention relates to a method for providing cooled bulk material for the production of fresh concrete, wherein the bulk material in a silo is flowed through and cooled by a cooling medium. Furthermore, the invention relates to a device for providing cooled bulk material for the production of fresh concrete with cooling for the bulk material in a silo.
  • the concrete components i.e. cement, water or the aggregates (e.g. gravel and / or sand) before mixing.
  • the water for mixing the concrete with a heat exchanger is at a temperature just above that
  • Freezing point cooled by water or the cement in the silo e.g. - Cooled by feeding liquid nitrogen.
  • this usually requires the installation of a second silo, in which the large amount of dust-laden gas generated by the latter method can be freed from the dust again.
  • the problem with cooling the aggregates is the correct metering of the cooling capacity to be introduced into a silo. Is z. For example, if too cold air is blown into a silo, the additives in the silo may freeze, since the additives generally have a certain degree of moisture. In the worst case, for example in the event of fluctuating (unplanned lower) removal quantities from the silo, the concreting work can come to a standstill.
  • the invention is therefore based on the object of providing a method for providing fresh concrete of a selected temperature which is economical is sensible to implement and has a high level of reliability with regard to the availability of fresh concrete.
  • the object is achieved in that the cooling medium is sucked out of the silo at one point and fed back to the silo at another point via a line, a coolant being added to the cooling medium and the temperature being at least in one point of the line is measured, which has the cooling medium, and this temperature is transmitted as an input value to a control or regulating device which adjusts or regulates the amount of refrigerant to be added.
  • control and regulation is intended to express that it is possible to achieve a good result by measuring the temperature once and adjusting the quantity of the refrigerant to be supplied under the same conditions (weather, quantity of concrete required). More often, however, the case occurs that at least one of the conditions mentioned changes and therefore regulation of the amount of refrigerant to be supplied is necessary in order to achieve an essentially constant temperature for the fresh concrete.
  • the bulk materials referred to as aggregates in the production of concrete are particularly advantageous to be cooled with the method according to the invention.
  • Sand and / or gravel are mostly used as additives.
  • the cooling of the aggregates is particularly suitable due to their high caloric content in the concrete mixing temperature, in order to be able to achieve the specifications even at low temperatures of the fresh concrete required for the installation.
  • the cooling medium absorbs energy from the additives. If the bed has not cooled down, the temperature at which the cooling medium exits the silo will only be slightly above the temperature of the uncooled bed. Accordingly, the control device continues
  • the control device interrupts the addition of refrigerant.
  • the performance of the extraction of cooling medium from the silo is expediently reduced.
  • the refrigerant is preferably added to the cooling medium in the line in the region of the feed end of the line. This solution is energetically very cheap, but only if the silo has a cover in the headspace. In the case of a silo open at the top, it is preferable to add the refrigerant further upstream in the line.
  • Air is used with particular advantage as the cooling medium. Above all, the free availability at every place of use as well as the easy miscibility with the refrigerant, especially with an evaporating refrigerant, is considered a particular advantage.
  • a cryogenic gas is preferably added as the refrigerant.
  • z. B. liquid nitrogen is used, which evaporates after addition to the air used as the cooling medium and thereby cools the air.
  • the air cooled in this way reaches an advantageous temperature of -10 ° C during continuous concrete production.
  • a temperature of + 1 ° C i.e. the lowest possible temperature around the freezing point of water, is aimed for. The temperature should not drop below 0 ° C during concreting breaks, otherwise there is a risk that disadvantageous icing will occur.
  • the silo has a suction for a cooling medium and a feed for the cooling medium, which are connected via a line and a blower outside the silo, with a measuring device for determining the temperature at least at one point of the line is provided, which has the cooling medium, and a control or regulating device for controlling or regulating the amount of a refrigerant to be added to the cooling medium is provided.
  • the addition of the refrigerant is advantageously provided in the region of the supply-side end of the line.
  • Air is preferably provided as the cooling medium and a cryogenic gas, in particular liquid nitrogen, as the refrigerant.
  • a cryogenic gas in particular liquid nitrogen
  • Figure a device according to the invention with a silo for bulk material
  • the figure shows a silo 1 for bulk material 5 and a line 2 with a blower 3, the suction direction of the blower 3 being indicated by arrows.
  • the measuring device 4 determines the temperature of the cooling medium extracted from the silo 1 in the line 2 and is connected via a signal line 6 to a control device (TIC) 7, which in turn addresses a valve 9 via a control line 8 and adjusts its degree of opening.
  • TIC control device
  • the valve 9 is mounted in the addition line 10, which is connected to a reservoir 11 (e.g. a tank 11) and opens into the line 2 at the other end.
  • a reservoir 11 e.g. a tank 11
  • the supply of refrigerant for example liquid nitrogen
  • the air in the lower area is extracted from silo 1 via line 2.
  • the fan 3 is installed in the line 2.
  • the air in the silo 1 is circulated downwards and via line 2 upwards and back into the silo 1.
  • the air is thus circulated, so to speak.
  • the temperature is determined with the aid of the measuring device 4, which contains, for example, a thermocouple, and the measured value is transmitted to the control device 7.
  • the degree of opening of the valve 9 is regulated, which determines the amount of liquid nitrogen (refrigerant) added from the tank 11 via the addition line 10 into the line 2.
  • the addition takes place in the vicinity of the feed end of line 2.
  • the speed of the Cooling can be determined.
  • a constant temperature of the cooling medium is advantageously assumed.

Abstract

The invention relates to a method for providing cooled bulk material (5) for producing fresh concrete, whereby the bulk material (5) is cross-flown and cooled by a coolant in a silo (1). The invention is characterized in that the coolant is sucked out of the silo (1) in one location and fed to the silo (1) in another location via a line (2). A cryogen is added to the coolant while the temperature is measured in a location of said line (2) containing the coolant. Said temperature is transmitted to a control or regulating device (7) which controls or regulates the appropriate amount of coolant to be added. The invention also relates to a device for providing cooled bulk material (5) for producing fresh concrete, comprising a cooling device for said bulk material (5) in a silo(1). The inventive device is characterized in that the silo (1) has an extracting device for the coolant and a feeding device for the coolant, which are connected by a line (2) and a blower (3) outside the silo (1). At least one measuring device (4) for detecting the temperature is provided in a location of the line (2) in which the coolant is contained, in addition to a control or regulating device for controlling or regulating the amount of cryogen that is to be added to the coolant.

Description

Beschreibung description
Verfahren und Vorrichtung zur Bereitstellung von gekühltem FrischbetonMethod and device for providing chilled fresh concrete
Die Erfindung betrifft ein Verfahren zur Bereitstellung von gekühltem Schüttgut zur Herstellung von Frischbeton, wobei das Schüttgut in einem Silo von einem Kühlmedium durchströmt und gekühlt wird. Des Weiteren betrifft die Erfindung eine Vorrichtung zur Bereitstellung von gekühltem Schüttgut zur Herstellung von Frischbeton mit einer Kühlung für das Schüttgut in einem Silo.The invention relates to a method for providing cooled bulk material for the production of fresh concrete, wherein the bulk material in a silo is flowed through and cooled by a cooling medium. Furthermore, the invention relates to a device for providing cooled bulk material for the production of fresh concrete with cooling for the bulk material in a silo.
Bekannt ist die Notwendigkeit den Frischbeton zur Erzielung einer zum Einbau üblicherweise geforderten Temperatur zu kühlen. Da eine bevorzugte Einbautemperatur z. B. bei +15 °C liegt, ist eine Kühlung vor allem in den Sommermonaten erforderlich. Üblicherweise wird der Frischbeton im Werks- oder Fahrmischer, also unmittelbar bei der Anmischung des Betons, z. B. durch den Zusatz von Scherbeneis gekühlt, wodurch möglicherweise der Wassergehalt des Betons erhöht wird.It is known to cool the fresh concrete in order to achieve a temperature that is usually required for installation. Since a preferred installation temperature z. B. is at +15 ° C, cooling is necessary especially in the summer months. Usually, the fresh concrete is in the factory or truck mixer, so immediately when mixing the concrete, for. B. cooled by adding flake ice, possibly increasing the water content of the concrete.
Neben dieser herkömmlichen Methode ist es ebenfalls bekannt die Betonkomponenten, also Zement, Wasser oder die Zuschlagstoffe (z. B. Kies und/oder Sand) vor der Mischung zu kühlen. Beispielsweise wird das Wasser zum Anmachen des Betons mit einem Wärmetauscher auf eine Temperatur knapp über demIn addition to this conventional method, it is also known to cool the concrete components, i.e. cement, water or the aggregates (e.g. gravel and / or sand) before mixing. For example, the water for mixing the concrete with a heat exchanger is at a temperature just above that
Gefrierpunkt von Wasser abgekühlt oder der Zement im Silo, z. - durch Einspeisen von flüssigem Stickstoff gekühlt. Allerdings ist dazu meist die Aufstellung eines zweiten Silos notwendig, in dem die bei der zuletzt genannten Methode entstehende große staubbefrachtete Gasmenge wieder vom Staub befreit werden kann. Bei der Kühlung der Zuschlagstoffe besteht die Schwierigkeit darin, die in einen Silo einzubringende Kälteleistung richtig zu dosieren. Wird z. B. zu kalte Luft in einen Silo eingeblasen, kann es zu einer Vereisung der Zuschlagstoffe im Silo kommen, da die Zuschlagstoffe in der Regel einen gewissen Feuchtegrad aufweisen. Dies kann im ungünstigsten Fall, zum Beispiel bei schwankender (ungeplant niedriger) Entnahmemenge aus dem Silo, zu einem Stillstand der Betonierarbeiten führen.Freezing point cooled by water or the cement in the silo, e.g. - Cooled by feeding liquid nitrogen. However, this usually requires the installation of a second silo, in which the large amount of dust-laden gas generated by the latter method can be freed from the dust again. The problem with cooling the aggregates is the correct metering of the cooling capacity to be introduced into a silo. Is z. For example, if too cold air is blown into a silo, the additives in the silo may freeze, since the additives generally have a certain degree of moisture. In the worst case, for example in the event of fluctuating (unplanned lower) removal quantities from the silo, the concreting work can come to a standstill.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Methode zur Bereitstellung von Frischbeton einer ausgewählten Temperatur zur Verfügung zu stellen, die wirtschaftlich sinnvoll zu verwirklichen ist und eine hohe Zuverlässigkeit im Hinblick auf die Verfügbarkeit des Frischbetons aufweist.The invention is therefore based on the object of providing a method for providing fresh concrete of a selected temperature which is economical is sensible to implement and has a high level of reliability with regard to the availability of fresh concrete.
Die gestellte Aufgabe wird verfahrensseitig dadurch gelöst, dass das Kühlmedium an einer Stelle aus dem Silo abgesaugt wird und über eine Leitung dem Silo an einer anderen Stelle wieder zugeführt wird, wobei dem Kühlmedium ein Kältemittel hinzugefügt wird und wobei mindestens an einer Stelle der Leitung die Temperatur gemessen wird, die das Kühlmedium aufweist, und diese Temperatur als Eingangswert an eine Steuer- oder Regeleinrichtung übermittelt wird, die die zuzugebende Menge an Kältemittel einstellt bzw. regelt.On the process side, the object is achieved in that the cooling medium is sucked out of the silo at one point and fed back to the silo at another point via a line, a coolant being added to the cooling medium and the temperature being at least in one point of the line is measured, which has the cooling medium, and this temperature is transmitted as an input value to a control or regulating device which adjusts or regulates the amount of refrigerant to be added.
Die Unterscheidung zwischen Steuern und Regeln soll ausdrücken, dass es möglich ist durch einmalige Temperaturmessung und ein einmaliges Einstellen der Menge des zuzuführenden Kältemittels bei gleichbleibenden Bedingungen (Witterung, benötigte Betonmenge) ein gutes Ergebnis zu erzielen. Häufiger tritt jedoch der Fall auf, dass sich zumindest eine der genannten Bedingungen ändert und somit eine Regelung der zuzuführenden Menge an Kältemittel notwendig ist, um eine im wesentlichen konstante Temperatur für den Frischbeton zu erzielen.The distinction between control and regulation is intended to express that it is possible to achieve a good result by measuring the temperature once and adjusting the quantity of the refrigerant to be supplied under the same conditions (weather, quantity of concrete required). More often, however, the case occurs that at least one of the conditions mentioned changes and therefore regulation of the amount of refrigerant to be supplied is necessary in order to achieve an essentially constant temperature for the fresh concrete.
Besonders vorteilhaft sind die bei der Betonherstellung als Zuschlagstoffe bezeichneten Schüttgüter mit dem erfindungsgemäßen Verfahren zu kühlen. Als Zuschlagstoffe werden meist Sand und/oder Kies verwendet. Die Kühlung der Zuschlagstoffe ist wegen deren hohen kalorischen Anteils an der Betonmischtemperatur besonders geeignet, um auch bei niedrigen zum Einbau geforderten Temperaturen des Frischbetons die Vorgaben erreichen zu können.The bulk materials referred to as aggregates in the production of concrete are particularly advantageous to be cooled with the method according to the invention. Sand and / or gravel are mostly used as additives. The cooling of the aggregates is particularly suitable due to their high caloric content in the concrete mixing temperature, in order to be able to achieve the specifications even at low temperatures of the fresh concrete required for the installation.
Beim Durchströmen der Schüttung im Silo nimmt das Kühlmedium Energie von den Zuschlagstoffen auf. Ist die Schüttung nicht durchgekühlt, wird die Austrittstemperatur des Kühlmediums aus dem Silo nur geringfügig über der Temperatur der ungekühlten Schüttung liegen. Dementsprechend wird von der Regeleinrichtung weiterhinWhen the bulk material flows through the silo, the cooling medium absorbs energy from the additives. If the bed has not cooled down, the temperature at which the cooling medium exits the silo will only be slightly above the temperature of the uncooled bed. Accordingly, the control device continues
Kältemittel in das Kühlmedium eingespeist. Erst wenn die Schüttung durchgekühlt ist, entspricht die Temperatur des abgesaugten Kühlmediums der Solltemperatur der Schüttung. In diesem Fall unterbricht die Regeleinrichtung die Zugabe von Kältemittel. Zweckmäßiger Weise wird in diesem Fall darüber hinaus die Leistung der Absaugung von Kühlmedium aus dem Silo reduziert. Bevorzugt wird das Kältemittel im Bereich des zuführungsseitigen Endes der Leitung dem Kuhlmedium in der Leitung zugegeben. Diese Lösung ist energetisch sehr günstig, jedoch nur wenn der Silo über eine Abdeckung im Kopfraum verfügt. Für den Fall eines oben offenen Silos ist die Zugabe des Kältemittels weiter stromaufwärts in der Leitung zu bevorzugen.Refrigerant fed into the cooling medium. Only when the bed has cooled down does the temperature of the extracted cooling medium correspond to the target temperature of the bed. In this case, the control device interrupts the addition of refrigerant. In this case, the performance of the extraction of cooling medium from the silo is expediently reduced. The refrigerant is preferably added to the cooling medium in the line in the region of the feed end of the line. This solution is energetically very cheap, but only if the silo has a cover in the headspace. In the case of a silo open at the top, it is preferable to add the refrigerant further upstream in the line.
Mit besonderem Vorteil wird als Kühlmedium Luft eingesetzt. Dabei- wird vor allem die freie Verfügbarkeit an jedem Einsatzort sowie die problemlose Mischbarkeit mit dem Kältemittel, vor allem mit einem verdampfenden Kältemittel, als besonderer Vorteil angesehen.Air is used with particular advantage as the cooling medium. Above all, the free availability at every place of use as well as the easy miscibility with the refrigerant, especially with an evaporating refrigerant, is considered a particular advantage.
Bevorzugt wird als Kältemittel ein kryogenes Gas zugegeben. Besonders bevorzugt kommt z. B. flüssiger Stickstoff zum Einsatz, der nach der Zugabe zur als Kühlmedium eingesetzten Luft verdampft und dadurch die Luft abkühlt. Die so abgekühlte Luft erreicht beispielsweise eine vorteilhafte Temperatur von - 10°C während einer kontinuierlichen Betonherstellung. Hingegen wird in Betonierpausen beispielsweise eine Temperatur von +1°C, also eine möglichst niedrige Temperatur um den Gefrierpunkt von Wasser angestrebt. Die 0°C sollten in Betonierpausen jedoch nicht nennenswert unterschritten werden, da andernfalls die Gefahr besteht, dass dann nachteilige Vereisungen auftreten.A cryogenic gas is preferably added as the refrigerant. Particularly preferably, z. B. liquid nitrogen is used, which evaporates after addition to the air used as the cooling medium and thereby cools the air. The air cooled in this way, for example, reaches an advantageous temperature of -10 ° C during continuous concrete production. On the other hand, during concreting breaks, for example, a temperature of + 1 ° C, i.e. the lowest possible temperature around the freezing point of water, is aimed for. The temperature should not drop below 0 ° C during concreting breaks, otherwise there is a risk that disadvantageous icing will occur.
Vorrichtungsseitig wird die gestellte Aufgabe dadurch gelöst, dass der Silo eine Absaugung für ein Kühlmedium und eine Zuführung für das Kühlmedium aufweist, die über eine Leitung und ein Gebläse außerhalb des Silos verbunden sind, wobei mindestens an einer Stelle der Leitung eine Messeinrichtung zur Ermittlung der Temperatur vorgesehen ist, die das Kühlmedium aufweist, sowie eine Steuer- oder Regeleinrichtung zur Steuerung bzw. Regelung der Menge eines dem Kühlmedium zuzugebenden Kältemittels vorgesehen ist.On the device side, the object is achieved in that the silo has a suction for a cooling medium and a feed for the cooling medium, which are connected via a line and a blower outside the silo, with a measuring device for determining the temperature at least at one point of the line is provided, which has the cooling medium, and a control or regulating device for controlling or regulating the amount of a refrigerant to be added to the cooling medium is provided.
Vorteilhaft ist die Zugabe für das Kältemittel im Bereich des zuführungsseitigen Endes der Leitung vorgesehen.The addition of the refrigerant is advantageously provided in the region of the supply-side end of the line.
Bevorzugt ist als Kühlmedium Luft vorgesehen und als Kältemittel ein kryogenes Gas, insbesondere flüssiger Stickstoff. Durch die genannten Ausgestaltungen der Vorrichtung ergeben sich ebenfalls die bereits bei der Beschreibung der Verfahrensschritte geschilderten Vorteile.Air is preferably provided as the cooling medium and a cryogenic gas, in particular liquid nitrogen, as the refrigerant. The mentioned configurations of the device also result in the advantages already described in the description of the method steps.
Die Erfindung sowie weitere Einzelheiten der Erfindung werden im Folgenden anhand eines in der Figur dargestellten Ausführungsbeispiels näher erläutert. Hierbei zeigt dieThe invention and further details of the invention are explained in more detail below with reference to an embodiment shown in the figure. Here shows the
Figur eine erfindungsgemäße Vorrichtung mit einem Silo für SchüttgutFigure a device according to the invention with a silo for bulk material
Im Einzelnen zeigt die Figur ein Silo 1 für Schüttgut 5 sowie eine Leitung 2 mit einem Gebläse 3, wobei die Saugrichtung des Gebläses 3 durch Pfeile gekennzeichnet ist. Die Messeinrichtung 4 ermittelt die Temperatur des aus dem Silo 1 abgesaugten Kühlmediums in der Leitung 2 und ist über eine Signalleitung 6 mit einer Regeleinrichtung (TIC) 7 verbunden, die ihrerseits über eine Steuerleitung 8 ein Ventil 9 anspricht und dessen Öffnungsgrad einstellt. Das Ventil 9 ist in der Zugabeleitung 10 angebracht, die mit einem Reservoir 11 (z. B. einem Tank 11) verbunden ist und am anderen Ende in die Leitung 2 mündet. Bei geschlossener Stellung des Ventils 9 ist die Zufuhr von Kältemittel (z. B. flüssigen Stickstoff) aus dem Tank 11 in die Leitung 2 unterbrochen.In detail, the figure shows a silo 1 for bulk material 5 and a line 2 with a blower 3, the suction direction of the blower 3 being indicated by arrows. The measuring device 4 determines the temperature of the cooling medium extracted from the silo 1 in the line 2 and is connected via a signal line 6 to a control device (TIC) 7, which in turn addresses a valve 9 via a control line 8 and adjusts its degree of opening. The valve 9 is mounted in the addition line 10, which is connected to a reservoir 11 (e.g. a tank 11) and opens into the line 2 at the other end. When the valve 9 is in the closed position, the supply of refrigerant (for example liquid nitrogen) from the tank 11 into the line 2 is interrupted.
Das Beispiel soll anhand der Verfahrensschritte weiter erläutert werden: Das Schüttgut 5 im Silol wird von Luft durchströmt, die beispielsweise von oben,, also im Befüllbereich des Silos eingetreten ist. Die Luft wird im unteren Bereich aus dem Silo 1 über die Leitung 2 abgesaugt. Zu diesem Zweck ist das Gebläse 3 in der Leitung 2 installiert. Es entsteht eine Umwälzung der Luft im Silo 1 nach unten und über Leitung 2 wieder nach oben und in den Silo 1 zurück. Die Luft wird damit sozusagen in einem Kreislauf geführt. Bei der aus dem unteren Bereich des Silos abgesaugten Luft wird mit Hilfe der Messeinrichtung 4, die beispielsweise ein Thermoelement enthält, die Temperatur bestimmt und der Messwert wird an die Regeleinrichtung 7 übermittelt. In Abhängigkeit von dem gemessenen Temperaturwert wird der Öffnungsgrad des Ventils 9 geregelt, das die Zugabemenge von flüssigen Stickstoff (Kältemittel)aus dem Tank 11 über die Zugabeleitung 10 in die Leitung 2 bestimmt. Die Zugabe findet in diesem Ausführungsbeispiel in der Nähe des zuführungsseitigen Endes der Leitung 2 statt. Über das Volumen der umgewälzten Luftmenge kann die Geschwindigkeit der Abkühlung bestimmt werden. Dabei wird vorteilhaft von einer konstanten Temperatur des Kühlmediums ausgegangen. The example will be explained further on the basis of the method steps: air flows through the bulk material 5 in the silol, which has entered, for example, from above, that is to say in the filling area of the silo. The air in the lower area is extracted from silo 1 via line 2. For this purpose, the fan 3 is installed in the line 2. The air in the silo 1 is circulated downwards and via line 2 upwards and back into the silo 1. The air is thus circulated, so to speak. In the case of the air extracted from the lower region of the silo, the temperature is determined with the aid of the measuring device 4, which contains, for example, a thermocouple, and the measured value is transmitted to the control device 7. Depending on the measured temperature value, the degree of opening of the valve 9 is regulated, which determines the amount of liquid nitrogen (refrigerant) added from the tank 11 via the addition line 10 into the line 2. In this exemplary embodiment, the addition takes place in the vicinity of the feed end of line 2. The speed of the Cooling can be determined. A constant temperature of the cooling medium is advantageously assumed.

Claims

Patentansprüche claims
1. Verfahren zur Bereitstellung von gekühltem Schüttgut (5) zur Herstellung von Frischbeton, wobei das Schüttgut (5) in einem Silo (1) von einem Kühlmedium durchströmt und gekühlt wird, dadurch gekennzeichnet, dass das Kühlmedium an einer Stelle aus dem Silo (1) abgesaugt wird und über eine Leitung (2) dem Silo1. A method for providing cooled bulk material (5) for the production of fresh concrete, wherein the bulk material (5) in a silo (1) is flowed through and cooled by a cooling medium, characterized in that the cooling medium at one point from the silo (1 ) is suctioned off and via a line (2) to the silo
(1) an einer anderen Stelle wieder zugeführt wird, wobei dem Kühlmedium ein Kältemittel hinzugefügt wird und wobei mindestens an einer Stelle der Leitung (2) die Temperatur gemessen wird, die das Kühlmedium aufweist, und diese Temperatur als Eingangswert an eine Steuer- oder Regeleinrichtung (7) übermittelt wird, die die zuzugebende Menge an Kältemittel einstellt bzw. regelt.(1) is supplied again at another point, a coolant being added to the cooling medium and the temperature at which the cooling medium is at least at one point of the line (2) measured, and this temperature as an input value to a control or regulating device (7) is transmitted, which adjusts or regulates the amount of refrigerant to be added.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Kältemittel im Bereich des zuführungsseitigen Endes der Leitung (2) dem Kühlmedium in der Leitung (2) zugegeben wird.2. The method according to claim 1, characterized in that the refrigerant in the region of the feed end of the line (2) is added to the cooling medium in the line (2).
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass als Kühlmedium Luft eingesetzt wird.3. The method according to claim 1 or 2, characterized in that air is used as the cooling medium.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass als Kältemittel ein kryogenes Gas, insbesondere flüssiger Stickstoff, zugegeben wird.4. The method according to any one of claims 1 to 3, characterized in that a cryogenic gas, in particular liquid nitrogen, is added as the refrigerant.
5. Vorrichtung zur Bereitstellung von gekühltem Schüttgut (5) zur Herstellung von Frischbeton mit einer Kühlung für das Schüttgut (5) in einem Silo (1), dadurch gekennzeichnet, dass der Silo (1) eine Absaugung für ein Kühlmedium und eine Zuführung für das Kühlmedium aufweist, die über eine Leitung (2) und ein Gebläse5. Device for providing chilled bulk material (5) for the production of fresh concrete with cooling for the bulk material (5) in a silo (1), characterized in that the silo (1) has a suction for a cooling medium and a feed for the Has cooling medium via a line (2) and a blower
(3) außerhalb des Silos (1) verbunden sind, wobei mindestens an einer Stelle der Leitung (2) eine Messeinrichtung (4) zur Ermittlung der Temperatur vorgesehen ist, die das Kühlmedium aufweist, sowie eine Steuer- oder Regeleinrichtung (7) zur Steuerung bzw. Regelung der Menge eines dem Kühlmedium zuzugebenden Kältemittels vorgesehen ist.(3) are connected outside the silo (1), a measuring device (4) for determining the temperature at which the cooling medium is present and a control or regulating device (7) for control being provided at least at one point in the line (2) or regulation of the amount of a refrigerant to be added to the cooling medium is provided.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Zugabe für das Kältemittel im Bereich des zuführungsseitigen Endes der Leitung (2) vorgesehen ist. 6. The device according to claim 5, characterized in that the addition for the refrigerant is provided in the region of the supply-side end of the line (2).
7. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass als Kühlmedium Luft vorgesehen ist.7. The device according to claim 5 or 6, characterized in that air is provided as the cooling medium.
8. Vorrichtung nach einem der.Ansprüche 5 bis 7, dadurch gekennzeichnet, dass als Kältemittel ein kryogenes Gas, insbesondere flüssiger Stickstoff, vorgesehen ist. 8. Device according to one of the . Claims 5 to 7, characterized in that a cryogenic gas, in particular liquid nitrogen, is provided as the refrigerant.
PCT/EP2003/008200 2002-07-26 2003-07-25 Method and device for providing cooled fresh concrete WO2004012916A1 (en)

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DE102009029893B4 (en) * 2009-06-23 2014-05-22 Messer Group Gmbh Apparatus and method for cooling and introducing a trickle or powdery material flow in a storage container

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US2648206A (en) * 1950-03-11 1953-08-11 J Sparks Van Method and apparatus for cooling aggregates
JPS6274603A (en) * 1985-09-30 1987-04-06 清水建設株式会社 Method and device for cooling concrete material
JPH01127302A (en) * 1987-11-13 1989-05-19 Mitsubishi Heavy Ind Ltd Concrete kneading device with aggregate-precooler
JPH02243303A (en) * 1989-03-17 1990-09-27 Kitagawa Iron Works Co Ltd Cooling method for coarse aggregate

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US2491194A (en) * 1948-01-19 1949-12-13 Royal M Mcshea Process for altering the temperature of aggregates
US2648206A (en) * 1950-03-11 1953-08-11 J Sparks Van Method and apparatus for cooling aggregates
JPS6274603A (en) * 1985-09-30 1987-04-06 清水建設株式会社 Method and device for cooling concrete material
JPH01127302A (en) * 1987-11-13 1989-05-19 Mitsubishi Heavy Ind Ltd Concrete kneading device with aggregate-precooler
JPH02243303A (en) * 1989-03-17 1990-09-27 Kitagawa Iron Works Co Ltd Cooling method for coarse aggregate

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