EP1978291B1 - Process for inerting a transport pipeline with a cryogen media and system for transporting cryogen media - Google Patents

Process for inerting a transport pipeline with a cryogen media and system for transporting cryogen media Download PDF

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Publication number
EP1978291B1
EP1978291B1 EP20070105804 EP07105804A EP1978291B1 EP 1978291 B1 EP1978291 B1 EP 1978291B1 EP 20070105804 EP20070105804 EP 20070105804 EP 07105804 A EP07105804 A EP 07105804A EP 1978291 B1 EP1978291 B1 EP 1978291B1
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Prior art keywords
line
transport
storage volume
transport line
pressure
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German (de)
French (fr)
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EP1978291A1 (en
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Stéphane Arnoux
Hervé Boisaubert
Grognet Philippe
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Messer France SAS
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Messer France SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas

Definitions

  • the invention relates to a system for transporting cryogenic media.
  • Carbon dioxide particles in the form of pellets or dry ice snow are conveyed to their place of use after being produced in thermally insulated lines.
  • a propellant is usually compressed air, which is due to the low temperatures of the carbon dioxide particles of up to minus 78 ° C previously subjected to a drying process in order to avoid the risk of ice formation.
  • the pressure in the transport line is higher than that in the outside environment; In this way it is avoided that moist outside air enters through possibly existing leaks in the transport line.
  • DE 102 47 505 A1 relates to a device for the treatment of cryogenic fuel, wherein also here the cryogenic fuel is stored in pressure vessels, wherein the fuel can be supplied via a lock of an internal combustion engine.
  • the lock ensures a pressure equalization of the internal combustion engine supplied medium.
  • the object of the present invention is therefore to permanently avoid the presence of water in the transport line and also to keep the temperature inside the transport line as long as possible as low as possible during breaks in operation.
  • the flow connected to the transport line or integrated in this storage volume is at least partially filled with the transported medium, at the beginning of a break, however, fluidly separated from the transport line or the remaining sections of the transport line, whereupon the remaining in the storage volume cryogenic medium evaporates and the vaporized medium is introduced at least into a line section or a plurality of line sections of the transport line.
  • a gas overpressure with respect to the outside atmosphere is formed there.
  • the gas flows into the flow-connected with the storage volume portions of the transport line and displaces any existing moist air there. Due to the continuous supply of the evaporated medium from the storage volume, a slight overpressure is also formed in the flooded sections of the transport line, which also prevents the entry of moist outside air through any leaks.
  • the transport line due to the low temperature of the evaporated cryogenic medium from initially only slightly above the boiling or sublimation held at a low temperature, which significantly reduces the expended to cool the transport line at its operating temperature at resumption of operation.
  • the overpressure generated by the evaporation of the cryogenic medium can also be used to detect a leak in the transport line.
  • the transport line can be subdivided into two, three or more line sections, which can each be supplied together or only partially with evaporated cryogenic medium.
  • the vaporized medium is introduced into the storage volume only when reaching a predetermined limit pressure in the storage volume.
  • Carbon dioxide is preferably used as the cryogenic medium, in particular solid carbon dioxide, which is conveyed in the form of pellets or snow through the transport line. At the beginning of a break in operation carbon dioxide particles remain in the storage volume, which sublime with gradually increasing temperature and inertize the transport line in the manner mentioned.
  • the object of the invention is achieved with a system for transporting a cryogenic medium in liquid or solid state through a transport line, with a transport line through which the cryogenic medium is transported in the liquid or solid state, which is arranged downstream of a conveyor and a plurality of gas-tight having separable line sections, wherein at least one line section is connected to a storage volume, which is in thermal contact with the external environment, wherein a gas line is provided, the storage volume with at least one further Line section of the transport line connects and which is equipped with a pressure control valve.
  • the cryogenic medium During the passage of the cryogenic medium through the transport line so that connected to this flow-connected storage volume is at least partially filled with the cryogenic medium, wherein the medium is at least partially in the liquid or solid state.
  • part of the medium remains in the storage volume. Due to the thermal contact with the environment, the storage volume heats up and the medium in it becomes gaseous. This leads to an increase in pressure inside the storage volume.
  • the pressure valve mounted in the gas line is designed such that it opens above a certain design-dictated or adjustable limit pressure and releases the flow connection between the storage volume and the flow-connected sections of the transport line. As a result, these sections are flooded with the vaporized medium and there is a uniform inerting and cooling of these line sections.
  • the storage volume is fluidically separated in a preferred embodiment of the transport line by means of controllable closing valves, which automatically go on entering the break in their closed state and at the end of the break in their open state.
  • the storage volume is a line section of the transport line itself.
  • this is separated from the remaining line sections in terms of flow, but remains via a separate gas line, which is preferably initially closed by means of the pressure valve. connected with these.
  • the pressure valve With the evaporation or sublimation of the cryogenic medium, the pressure within the separated line section increases. Above a predetermined or selected limit pressure, the gas line is opened by the pressure valve and the evaporated medium flows into the connected line sections, where it ensures inertization.
  • FIG. 1 schematically shows a system according to the invention for transporting a cryogenic medium.
  • the transport system 1 is a device in which carbon dioxide particles are conveyed in the form of pellets or snow by means of compressed air.
  • carbon dioxide particles are used in a variety of fields, for example in the cleaning of surfaces, in the cooling of food products or pharmaceutical preparations, as well as in various applications in the field of chemistry, metallurgy or electronics.
  • the transport system 1 comprises a transport line 2, in which the carbon dioxide particles are conveyed by means of a conveyor 3. Upstream to the conveyor 3, the transport line is connected in a manner not of interest here with a reservoir for the carbon dioxide particles.
  • the transport line 2 is predominantly provided with a thermal insulation 4, which is, however, at least partially interrupted in the region of a line section 5.
  • This line section 5 is by means of control valves 6,7 fluidically separated from the other, completely thermally insulated line sections 9 of the transport line 2. From the line section 5 opens a gas line 8, which are connected via connecting lines 10,11 with further line sections 9 of the transport line 2. At branch points 12,13 connections can be made with other, not shown here line sections.
  • a pressure valve 15 is provided, which releases the gas line 8 above a certain gas pressure in the interior of the line section 5, but below this gas pressure closes.
  • a control unit 16 monitors and controls the motor of the conveyor 3 and the control valves 6,7.
  • the control valves are opened 6.7.
  • the pressure valve 15 is closed.
  • Carbon dioxide particles are conveyed under the action of the conveyor 3 by means of compressed air through the transport line 2.
  • the motor of the conveyor 3 is turned off by a signal of the control unit 16.
  • the line section 5 may also have a geometry suitable for this purpose or be arranged at a particular location within the transport line 2, at which a particularly high accumulation of particles is to be expected.
  • the line section 5 can be widened with respect to the remaining line sections or arranged in the region of a bend in the transport line 2, or an additional volume can be in flow connection with the line section 5, which then acts as the actual storage volume for the carbon dioxide.
  • the conveyor which are also in communication with the control unit 16 in data exchange control valves 6.7 are closed.
  • the line section 5 is thus hermetically separated from the remaining line sections 9 of the transport line 2. Due to the at least partially missing thermal insulation 4 in the region of the line section 5 (or a storage volume connected to the line section), the carbon dioxide particles located in the interior of the line section 5 heat up and sublimate to carbon dioxide gas, which fills the line section 5 with gradually increasing pressure.
  • a predetermined limit pressure opens the pressure valve 15 and The gaseous carbon dioxide flows into the pipe sections 9 of the transport line 2 connected in fluid flow with the gas line 8. This creates an atmosphere of carbon dioxide in the line sections 9 which has a slight overpressure with respect to the outside atmosphere and thus largely prevents the ingress of moist outside air.
  • the pipe sections 9 are cooled by the carbon dioxide gas which, after sublimation, has a temperature of only slightly above minus 78 ° C.
  • the thermally insulated line sections can be kept so cold over a longer period of time effectively.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Description

Die Erfindung betrifft ein System zum Transportieren von kryogenen Medien.The invention relates to a system for transporting cryogenic media.

Kohlendioxidpartikel in Form von Pellets oder Trockeneisschnee werden nach ihrer Erzeugung in thermisch isolierten Leitungen zu ihrem Einsatzort gefördert. Als Treibmittel dient dabei in der Regel Druckluft, die aufgrund der tiefen Temperaturen der Kohlendioxidpartikel von bis zu minus 78°C zuvor einem Trocknungsprozess unterworfen wird, um die Gefahr einer Eisbildung zu vermeiden. Während des Einsatzes der Transportleitung ist der Druck in der Transportleitung höher als der in der Außenumgebung; auf diese Weise wird vermieden, dass feuchte Außenluft durch möglicherweise vorhandene Leckagen in der Transportleitung eintritt.Carbon dioxide particles in the form of pellets or dry ice snow are conveyed to their place of use after being produced in thermally insulated lines. As a propellant is usually compressed air, which is due to the low temperatures of the carbon dioxide particles of up to minus 78 ° C previously subjected to a drying process in order to avoid the risk of ice formation. During use of the transport line, the pressure in the transport line is higher than that in the outside environment; In this way it is avoided that moist outside air enters through possibly existing leaks in the transport line.

DE 24 10 833 A1 und US 2005/0274127 A1 beschreiben Gegenstände, bei denen ein flüssiges kryogenes Medium unter Druck in einem Tank bevorratetet wird. Unter dem Druck im Innern des Vorratstanks wird das kryogene Medium einem Verbraucher zugeführt. Um nach Trennung vom Verbraucher einen durch das Verdampfen des kryogenen Mediums hervorgerufenen Überdruck zu vermeiden, sind die Zuführungen jeweils mit einer Rückleitung mit Rückschlagventil ausgerüstet, die ein Zurückfließen überschüssigen Mediums in den Vorratstank ermöglicht. DE 24 10 833 A1 and US 2005/0274127 A1 describe articles in which a liquid cryogenic medium is stored under pressure in a tank. Under pressure in the interior of the storage tank, the cryogenic medium is supplied to a consumer. In order to avoid after separation from the consumer caused by the evaporation of the cryogenic medium pressure, the feeders are each equipped with a return line with a check valve, which allows a backflow of excess medium in the storage tank.

DE 102 47 505 A1 betrifft eine Vorrichtung zur Aufbereitung von kryogenem Kraftstoff, wobei auch hier der kryogene Kraftstoff in Druckbehältern bevorratet wird, wobei der Kraftstoff über eine Schleuse einer Brennkraftmaschine zugeführt werden kann. Die Schleuse sorgt für einen Druckausgleich des der Brennkraftmaschine zugeführten Mediums. DE 102 47 505 A1 relates to a device for the treatment of cryogenic fuel, wherein also here the cryogenic fuel is stored in pressure vessels, wherein the fuel can be supplied via a lock of an internal combustion engine. The lock ensures a pressure equalization of the internal combustion engine supplied medium.

Es besteht jedoch die Gefahr, dass während einer Betriebspause der Druck in der Transportleitung allmählich auf den Druck der äußeren Atmosphäre absinkt. Dies hat zur Folge, dass feuchte Außenluft durch etwaig vorhandene Leckagen, durch offen gelassene Verbindungselemente oder durch angeschlossene, nicht gasdichte Apparaturen eintreten kann. Die in der Luft vorhandene Feuchte Luft gefriert beim Kontakt mit dem Trockeneis oder an unterkühlten Wandabschnitten der Transportleitung und kann dadurch zur Beeinträchtigung des Betriebsablaufs bis hin zur völligen Verstopfung der Transportleitung führen. Das Gleiche gilt im Falle längerer Stillstandzeiten: Der sich im Laufe der Zeit ansammelnde Wasserdampf kondensiert bei Betriebsaufnahme durch den Kontakt mit dem geförderten Trockeneis. Dadurch wird ein erheblicher Teil der in den Trockeneisteilchen enthaltenen Kälteenergie absorbiert und verschlechtert somit die Qualität des transportierten Trockeneises. Bei länger andauernden Betriebspausen führt zudem das sich an den Wandabschnitten anlagernde Wasser zu einem erheblich höheren Energieaufwand beim Abkühlen der Transportleitung auf seine Betriebstemperatur von beispielsweise minus 78°C.However, there is a risk that, during a break in operation, the pressure in the transport line gradually drops to the pressure of the external atmosphere. As a result, moist outside air can enter through any leaks present, through open connection elements or through connected, non-gas-tight equipment. The humidity air present in the air freezes on contact with the dry ice or on undercooled wall sections of the transport line and can thus affect the operation process up to lead to complete blockage of the transport line. The same applies in the case of prolonged downtimes: The accumulating over time water vapor condenses at startup by the contact with the conveyed dry ice. As a result, a considerable part of the cold energy contained in the dry ice particles is absorbed and thus deteriorates the quality of the transported dry ice. For longer lasting breaks also leads to the adjoining water to the wall sections to a significantly higher energy consumption when cooling the transport line to its operating temperature of, for example minus 78 ° C.

Aufgabe der vorliegenden Erfindung ist daher, die Präsenz von Wasser in der Transportleitung dauerhaft zu vermeiden und zudem während Betriebspausen die Temperatur im Innern der Transportleitung möglichst lang möglichst niedrig zu halten.The object of the present invention is therefore to permanently avoid the presence of water in the transport line and also to keep the temperature inside the transport line as long as possible as low as possible during breaks in operation.

Diese Aufgabe ist gelöst durch ein Transportsystem mit den Merkmalen des Anspruchs 1.This object is achieved by a transport system having the features of claim 1.

Während des Betriebs der Transportleitung wird das mit der Transportleitung strömungsverbundene oder in diese integrierte Speichervolumen zumindest teilweise mit dem transportierten Medium gefüllt, zu Beginn einer Betriebspause jedoch von der Transportleitung bzw. den übrigen Abschnitten der Transportleitung strömungstechnisch getrennt, woraufhin das im Speichervolumen verbliebene kryogene Medium verdampft und das verdampfte Medium zumindest in einen Leitungsabschnitt oder mehrere Leitungsabschnitte der Transportleitung eingeleitet wird.During operation of the transport line, the flow connected to the transport line or integrated in this storage volume is at least partially filled with the transported medium, at the beginning of a break, however, fluidly separated from the transport line or the remaining sections of the transport line, whereupon the remaining in the storage volume cryogenic medium evaporates and the vaporized medium is introduced at least into a line section or a plurality of line sections of the transport line.

Durch das Verdampfen des kryogenen Mediums im Speichervolumen bildet sich dort ein Gasüberdruck gegenüber der Außenatmosphäre aus. Das Gas strömt in die mit dem Speichervolumen strömungsverbundenen Abschnitte der Transportleitung ein und verdrängt dort etwaig vorhandene feuchte Luft. Durch die fortwährende Zufuhr des verdampften Mediums aus dem Speichervolumen bildet sich auch in den gefluteten Abschnitten der Transportleitung ein geringer Überdruck aus, der auch das Eindringen feuchter Außenluft durch etwaige Leckagen verhindert. Zugleich wird die Transportleitung aufgrund der tiefen Temperatur des verdampften kryogenen Mediums von zunächst nur wenig über dem Siede- bzw. Sublimationspunkt auf einer tiefen Temperatur gehalten, die bei Wiederaufnahme des Betriebs die zur Abkühlung der Transportleitung auf ihrer Betriebstemperatur aufzuwendende Energie deutlich reduziert. Der durch das Verdampfen des kryogenen Medium erzeugte Überdruck kann zudem dazu eingesetzt werden, eine Leckage in der Transportleitung aufzuspüren. Die Transportleitung kann in zwei, drei oder mehr Leitungsabschnitte unterteilt sein, die jeweils gemeinsam oder nur zum Teil mit verdampftem kryogenem Medium versorgt werden können.As a result of the evaporation of the cryogenic medium in the storage volume, a gas overpressure with respect to the outside atmosphere is formed there. The gas flows into the flow-connected with the storage volume portions of the transport line and displaces any existing moist air there. Due to the continuous supply of the evaporated medium from the storage volume, a slight overpressure is also formed in the flooded sections of the transport line, which also prevents the entry of moist outside air through any leaks. At the same time the transport line due to the low temperature of the evaporated cryogenic medium from initially only slightly above the boiling or sublimation held at a low temperature, which significantly reduces the expended to cool the transport line at its operating temperature at resumption of operation. The overpressure generated by the evaporation of the cryogenic medium can also be used to detect a leak in the transport line. The transport line can be subdivided into two, three or more line sections, which can each be supplied together or only partially with evaporated cryogenic medium.

Bevorzugt wird das verdampfte Medium erst bei Erreichen eines vorgegebenen Grenzdruckes im Speichervolumen die Leitungsabschnitte eingeleitet.Preferably, the vaporized medium is introduced into the storage volume only when reaching a predetermined limit pressure in the storage volume.

Als kryogenes Medium kommt vorzugsweise Kohlendioxid zum Einsatz, insbesondere festes Kohlendioxid, das in Form von Pellets oder Schnee durch die Transportleitung gefördert wird. Bei Beginn einer Betriebspause verbleiben Kohlendioxidpartikel im Speichervolumen, die mit allmählich zunehmender Temperatur sublimieren und in der genannten Weise die Transportleitung inertisieren.Carbon dioxide is preferably used as the cryogenic medium, in particular solid carbon dioxide, which is conveyed in the form of pellets or snow through the transport line. At the beginning of a break in operation carbon dioxide particles remain in the storage volume, which sublime with gradually increasing temperature and inertize the transport line in the manner mentioned.

Die Aufgabe der Erfindung wird mit einem System zum Transportieren eines kryogenen Mediums im flüssigen oder festen Zustand durch eine Transportleitung gelöst, mit einer Transportleitung, durch die das kryogene Medium im flüssigen oder festen Zustand transportiert wird, die stromab zu einer Fördereinrichtung angeordnet ist und mehrere gasdicht voneinander abtrennbare Leitungsabschnitte aufweist, wobei wenigstens ein Leitungsabschnitt mit einem Speichervolumen verbunden ist, das mit der Außenumgebung in thermischen Kontakt steht, wobei eine Gasleitung vorgesehen ist, die das Speichervolumen mit zumindest einem weiteren Leitungsabschnitt der Transportleitung verbindet und die mit einem Druckregelventil ausgerüstet ist.The object of the invention is achieved with a system for transporting a cryogenic medium in liquid or solid state through a transport line, with a transport line through which the cryogenic medium is transported in the liquid or solid state, which is arranged downstream of a conveyor and a plurality of gas-tight having separable line sections, wherein at least one line section is connected to a storage volume, which is in thermal contact with the external environment, wherein a gas line is provided, the storage volume with at least one further Line section of the transport line connects and which is equipped with a pressure control valve.

Während der Durchleitung des kryogenen Mediums durch die Transportleitung wird also das mit diesem strömungsverbundene Speichervolumen mit dem kryogenen Medium zumindest teilweise gefüllt, wobei sich das Medium zumindest teilweise im flüssigen oder festen Zustand befindet. Beim Eintritt einer Betriebspause bleibt ein Teil des Mediums im Speichervolumen zurück. Aufgrund des thermischen Kontakts mit der Umgebung erwärmt sich das Speichervolumen und das in ihm befindliche Medium geht in den gasförmigen Zustand über. Dadurch kommt es zu einem Druckanstieg im Innern des Speichervolumens. Das in der Gasleitung montierte Druckventil ist derart ausgelegt, dass es oberhalb eines bestimmten, bauartbedingt vorgegebenen oder einstellbaren Grenzdrucks öffnet und die Strömungsverbindung zwischen dem Speichervolumen und den mit diesem strömungsverbundenen Abschnitten der Transportleitung freigibt. Dadurch werden diese Abschnitte mit dem verdampften Medium geflutet und es kommt zu einer gleichmäßigen Inertisierung und Kühlung dieser Leitungsabschnitte.During the passage of the cryogenic medium through the transport line so that connected to this flow-connected storage volume is at least partially filled with the cryogenic medium, wherein the medium is at least partially in the liquid or solid state. When an interruption occurs, part of the medium remains in the storage volume. Due to the thermal contact with the environment, the storage volume heats up and the medium in it becomes gaseous. This leads to an increase in pressure inside the storage volume. The pressure valve mounted in the gas line is designed such that it opens above a certain design-dictated or adjustable limit pressure and releases the flow connection between the storage volume and the flow-connected sections of the transport line. As a result, these sections are flooded with the vaporized medium and there is a uniform inerting and cooling of these line sections.

Das Speichervolumen ist in einer bevorzugten Ausgestaltung von der Transportleitung mittels ansteuerbarer Schließarmaturen strömungstechnisch trennbar, die automatisch beim Eintritt der Betriebspause in ihren Schließzustand und beim Ende der Betriebspause in ihren Öffnungszustand übergehen.The storage volume is fluidically separated in a preferred embodiment of the transport line by means of controllable closing valves, which automatically go on entering the break in their closed state and at the end of the break in their open state.

In einer besonders vorteilhaften Ausgestaltung der Erfindung handelt es sich bei dem Speichervolumen um einen Leitungsabschnitt der Transportleitung selbst. Beim Eintritt einer Betriebspause wird dieses strömungstechnisch von den übrigen Leitungsabschnitten getrennt, bleibt jedoch über eine separate Gasleitung, die bevorzugt zunächst noch mittels des Druckventils geschlossen ist, mit diesen verbunden. Mit der Verdampfung bzw. Sublimation des kryogenen Mediums steigt der Druck innerhalb des abgetrennten Leitungsabschnitts an. Oberhalb eines vorgegebenen oder gewählten Grenzdrucks wird die Gasleitung durch das Druckventil geöffnet und das verdampfte Medium strömt in die verbundenen Leitungsabschnitte und sorgt dort für eine Inertisierung.In a particularly advantageous embodiment of the invention, the storage volume is a line section of the transport line itself. When an operating pause occurs, this is separated from the remaining line sections in terms of flow, but remains via a separate gas line, which is preferably initially closed by means of the pressure valve. connected with these. With the evaporation or sublimation of the cryogenic medium, the pressure within the separated line section increases. Above a predetermined or selected limit pressure, the gas line is opened by the pressure valve and the evaporated medium flows into the connected line sections, where it ensures inertization.

Anhand der Zeichnung soll ein Ausführungsbeispiel der Erfindung näher erläutert werden. Die einzige Zeichnung (Fig. 1) zeigt schematisch eine erfindungsgemäßes System zum Transportieren eines kryogenen Mediums.Reference to the drawings, an embodiment of the invention will be explained in more detail. The only drawing ( Fig. 1 ) schematically shows a system according to the invention for transporting a cryogenic medium.

Bei dem Transportsystem 1 handelt es sich um eine Einrichtung, bei der Kohlendioxidpartikel in Form von Pellets oder Schnee mittels Druckluft gefördert werden. Derartige Kohlendioxidpartikel kommen in vielfältigen Bereichen zum Einsatz, beispielsweise bei der Reinigung von Oberflächen, bei der Kühlung von Lebensmittelprodukten oder pharmazeutischen Präparaten, ebenso wie bei verschiedenen Einsatzmöglichkeiten aus dem Bereich der Chemie, der Metallurgie oder der Elektronik.In the transport system 1 is a device in which carbon dioxide particles are conveyed in the form of pellets or snow by means of compressed air. Such carbon dioxide particles are used in a variety of fields, for example in the cleaning of surfaces, in the cooling of food products or pharmaceutical preparations, as well as in various applications in the field of chemistry, metallurgy or electronics.

Das Transportsystem 1 umfasst eine Transportleitung 2, in der die Kohlendioxidpartikel mittels einer Fördereinrichtung 3 gefördert werden. Stromauf zur Fördereinrichtung 3 ist die Transportleitung in hier nicht weiter interessierender Weise mit einem Vorratsbehälter für die Kohlendioxidpartikel verbunden. Die Transportleitung 2 ist überwiegend mit einer thermischen Isolierung 4 versehen, die jedoch im Bereich eines Leitungsabschnitts 5 zumindest teilweise unterbrochen ist.The transport system 1 comprises a transport line 2, in which the carbon dioxide particles are conveyed by means of a conveyor 3. Upstream to the conveyor 3, the transport line is connected in a manner not of interest here with a reservoir for the carbon dioxide particles. The transport line 2 is predominantly provided with a thermal insulation 4, which is, however, at least partially interrupted in the region of a line section 5.

Dieser Leitungsabschnitt 5 ist mittels Stellventile 6,7 strömungstechnisch von den übrigen, thermisch vollständig isolierten Leitungsabschnitten 9 der Transportleitung 2 trennbar. Vom Leitungsabschnitt 5 mündet eine Gasleitung 8 aus, die über Verbindungsleitungen 10,11 mit weitern Leitungsabschnitten 9 der Transportleitung 2 verbunden sind. An Abzweigpunkten 12,13 können Verbindungen mit weiteren, hier nicht gezeigten Leitungsabschnitten hergestellt werden. In der Gasleitung 8 ist ein Druckventil 15 vorgesehen, das oberhalb eines bestimmten Gasdrucks im Innern des Leitungsabschnitts 5 die Gasleitung 8 freigibt, unterhalb dieses Gasdrucks jedoch schließt. Eine Steuereinheit 16 überwacht und steuert den Motor der Fördereinrichtung 3 und die Stellventile 6,7.This line section 5 is by means of control valves 6,7 fluidically separated from the other, completely thermally insulated line sections 9 of the transport line 2. From the line section 5 opens a gas line 8, which are connected via connecting lines 10,11 with further line sections 9 of the transport line 2. At branch points 12,13 connections can be made with other, not shown here line sections. In the gas line 8, a pressure valve 15 is provided, which releases the gas line 8 above a certain gas pressure in the interior of the line section 5, but below this gas pressure closes. A control unit 16 monitors and controls the motor of the conveyor 3 and the control valves 6,7.

Beim Betrieb des Transportsystems 1 sind die Stellventile 6,7 geöffnet. Das Druckventil 15 ist geschlossen. Kohlendioxidpartikel werden unter der Wirkung der Fördereinrichtung 3 mittels Druckluft durch die Transportleitung 2 gefördert. Beim Eintritt einer Betriebspause wird der Motor der Fördereinrichtung 3 durch ein Signal der Steuereinheit 16 abgestellt. In Innern der gesamten Transportleitung 2 bleiben Kohlendioxidpartikel zurück. Um eine besonders große Menge an zurückbleibenden Kohlendioxidpartikeln im Innern des Leitungsabschnitts 5 zu gewährleisten, kann der Leitungsabschnitt 5 auch eine hierzu geeignete Geometrie aufweisen oder an einer besonderen Stelle innerhalb der Transportleitung 2 angeordnet sein, an der ein besonders hoher Anfall an Partikeln zu erwarten ist. Beispielsweise kann der Leitungsabschnitt 5 gegenüber den übrigen Leitungsabschnitten verbreitert oder im Bereich eines Knicks in der Transportleitung 2 angeordnet sein, oder es kann ein zusätzliches Volumen mit dem Leitungsabschnitt 5 in Strömungsverbindung stehen, das dann als eigentliches Speichervolumen für das Kohlendioxid fungiert. Zugleich mit der Fördereinrichtung werden die gleichfalls mit der Steuereinheit 16 in Datenaustausch stehenden Stellventile 6,7 geschlossen. Der Leitungsabschnitt 5 ist somit hermetisch von den übrigen Leitungsabschnitten 9 der Transportleitung 2 getrennt. Aufgrund der im Bereich des Leitungsabschnitts 5 (beziehungsweise eines an den Leitungsabschnitt angeschlossenen Speichervolumens) zumindest teilweise fehlenden thermischen Isolierung 4 erwärmen sich die im Innern des Leitungsabschnitts 5 befindliche Kohlendioxidpartikel und sublimieren zu Kohlendioxidgas, das den Leitungsabschnitt 5 bei allmählich ansteigendem Druck ausfüllt. Oberhalb eines vorgegebenen Grenzdrucks öffnet das Druckventil 15 und das gasförmige Kohlendioxid strömt in die mit der Gasleitung 8 strömungsverbundenen Leitungsabschnitte 9 der Transportleitung 2. Dadurch entsteht in den Leitungsabschnitten 9 eine Atmosphäre von Kohlendioxid, die gegenüber der Außenatmosphäre einen geringen Überdruck aufweist und dadurch das Eindringen von feuchter Außenluft weitgehend verhindert. Zugleich werden die Leitungsabschnitte 9 vom Kohlendioxidgas, das nach seiner Sublimation einer Temperatur von nur wenig über minus 78°C aufweist, gekühlt. Die thermisch isolierten Leitungsabschnitte können so wirkungsvoll über einen längeren Zeitraum kalt gehalten werden werden. In dem Fall, dass ein Leitungsabschnitt strömungsoffen ist, also beispielsweise eine Leckage aufweist oder eine nicht gasdichte Verbindung mit einem Endgerät aufweist, erfolgt ein gleichmäßiger Kohlendioxidstrom durch den betreffenden Leitungsabschnitt hindurch. Nach Beendigung der Betriebspause werden die Stellventile 6,7 geöffnet und der Transport von Kohlendioxidpartikeln durch die Transportleitung 2 wird wieder aufgenommen.During operation of the transport system 1, the control valves are opened 6.7. The pressure valve 15 is closed. Carbon dioxide particles are conveyed under the action of the conveyor 3 by means of compressed air through the transport line 2. Upon the occurrence of a break in operation, the motor of the conveyor 3 is turned off by a signal of the control unit 16. Inside the entire transport line 2 carbon dioxide particles remain behind. In order to ensure a particularly large amount of remaining carbon dioxide particles in the interior of the line section 5, the line section 5 may also have a geometry suitable for this purpose or be arranged at a particular location within the transport line 2, at which a particularly high accumulation of particles is to be expected. For example, the line section 5 can be widened with respect to the remaining line sections or arranged in the region of a bend in the transport line 2, or an additional volume can be in flow connection with the line section 5, which then acts as the actual storage volume for the carbon dioxide. At the same time with the conveyor, which are also in communication with the control unit 16 in data exchange control valves 6.7 are closed. The line section 5 is thus hermetically separated from the remaining line sections 9 of the transport line 2. Due to the at least partially missing thermal insulation 4 in the region of the line section 5 (or a storage volume connected to the line section), the carbon dioxide particles located in the interior of the line section 5 heat up and sublimate to carbon dioxide gas, which fills the line section 5 with gradually increasing pressure. Above a predetermined limit pressure opens the pressure valve 15 and The gaseous carbon dioxide flows into the pipe sections 9 of the transport line 2 connected in fluid flow with the gas line 8. This creates an atmosphere of carbon dioxide in the line sections 9 which has a slight overpressure with respect to the outside atmosphere and thus largely prevents the ingress of moist outside air. At the same time, the pipe sections 9 are cooled by the carbon dioxide gas which, after sublimation, has a temperature of only slightly above minus 78 ° C. The thermally insulated line sections can be kept so cold over a longer period of time effectively. In the event that a line section is open to flow, that is, for example, has a leakage or has a non-gas-tight connection with a terminal, a uniform carbon dioxide flow through the line section in question takes place. After completion of the pause in operation, the control valves are opened 6.7 and the transport of carbon dioxide particles through the transport line 2 is resumed.

Die Entstehung von Wassereis in der Transportleitung 2 wird auf diese Weise wirkungsvoll unterbunden. Verluste an Energie und Arbeitszeit werden dadurch deutlich verringert.The formation of water ice in the transport line 2 is effectively prevented in this way. Losses in energy and working hours are thereby significantly reduced.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Transporteinrichtungtransport means
22
Transportleitungtransport line
33
FördereinrichtungConveyor
44
Isolierunginsulation
55
Leitungsabschnittline section
66
StellventilControl valve
77
StellventilControl valve
88th
Gasleitunggas pipe
99
Leitungsabschnittline section
1010
Verbindungsleitungconnecting line
1111
Verbindungsleitungconnecting line
1212
Abzweigpunktbranching point
1313
Abzweigpunktbranching point
1414
--
1515
Druckventilpressure valve
1616
Steuereinheitcontrol unit

Claims (5)

  1. System for transporting a cryogenic medium in the liquid or solid state, with a transport line (2), through which the cryogenic medium is transported in the liquid or solid state and which is arranged downstream of a conveying device (3) and has a plurality of line portions (5, 9) separable from one another in a gas-tight manner, at least one line portion (5) being connected to a storage volume which is in thermal contact with the external surroundings, a gas line (8) being provided, which connects the storage volume (5) to at least one further line portion (9) of the transport line (2) and which is equipped with a pressure-regulating valve (15).
  2. Transport system according to Claim 1, characterized in that the storage volume (5) can be separated fluidically from the transport line (2) by means of activatable closing valves (6, 7) which automatically assume their closing state at the commencement of the operating intermission and assume their opening state at the end of the operating intermission.
  3. Transport system according to Claim 1 or 2, characterized in that a line portion of the transport line (2) is provided as the storage volume (5).
  4. Transport system according to one of the preceding claims, characterized in that the pressure-regulating valve (15) is configured such that the evaporated medium is introduced into the line portions (9) only when a stipulated limit pressure is reached in the storage volume (5).
  5. Transport system according to one of the preceding claims, characterized in that carbon dioxide in the form of pellets or snow is conveyed in the transport line (2) by means of compressed air.
EP20070105804 2007-04-05 2007-04-05 Process for inerting a transport pipeline with a cryogen media and system for transporting cryogen media Not-in-force EP1978291B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20070105804 EP1978291B1 (en) 2007-04-05 2007-04-05 Process for inerting a transport pipeline with a cryogen media and system for transporting cryogen media

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070105804 EP1978291B1 (en) 2007-04-05 2007-04-05 Process for inerting a transport pipeline with a cryogen media and system for transporting cryogen media

Publications (2)

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EP1978291A1 EP1978291A1 (en) 2008-10-08
EP1978291B1 true EP1978291B1 (en) 2012-07-11

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103486442B (en) * 2013-09-26 2016-01-20 瓮福（集团）有限责任公司 A kind of device without transport pump slip

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2410833A1 (en) 1974-03-07 1975-09-11 Messer Griesheim Gmbh Expanding fuel pipeline protection bypass valve system - has bypass pipeline with a nonreturn valve opening in outlet direction
AT405442B (en) * 1997-12-19 1999-08-25 Wiener Stadtwerke METHOD AND ARRANGEMENT FOR REMOVING COMBUSTION GAS FROM GAS NETWORKS
FR2794844B1 (en) * 1999-06-08 2001-08-03 Air Liquide METHOD AND DEVICE FOR GASTING A CORROSIVE GAS DISTRIBUTION LINE
DE10247505A1 (en) 2002-10-11 2004-05-06 Bayerische Motoren Werke Ag An adjustable gate has a separating wall and is positioned between a cryogenic tank and high and low pressure fuel supply inlets for an engine
US20050274127A1 (en) 2004-03-30 2005-12-15 Paul Drube Cryogenic fluid dispensing system
US7426935B2 (en) * 2005-04-14 2008-09-23 Gm Global Technology Operations, Inc. Method of discharging high pressure storage vessels
DE102005057790B4 (en) * 2005-12-03 2010-01-21 Messer France S.A.S Method for inerting a transport line and system for transporting cryogenic media

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