DE102013214044A1 - A method for determining the mass of the medium stored in a cryopressure tank - Google Patents
A method for determining the mass of the medium stored in a cryopressure tank Download PDFInfo
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- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
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- F17C3/00—Vessels not under pressure
- F17C3/02—Vessels not under pressure with provision for thermal insulation
- F17C3/08—Vessels not under pressure with provision for thermal insulation by vacuum spaces, e.g. Dewar flask
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- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/05—Size
- F17C2201/056—Small (<1 m3)
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- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
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- F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
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- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
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- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
- F17C2223/036—Very high pressure (>80 bar)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
Die Erfindung betrifft ein Verfahren zum Bestimmen der Masse des in einem Kryodrucktank gespeicherten Mediums, wobei der Kryodrucktank einen Außenbehälter und einen innerhalb dessen über ein Festlager und zumindest ein Loslager gelagerter Innenbehälter aufweist, in welchem das besagte Medium tiefkalt und unter Druckwerten in der Größenordnung von mehreren hundert Bar speicherbar ist und das oder die Loslager vorgesehen ist oder sind, um Änderungen der Abmessungen des Innenbehälters, welche auf Änderungen von dessen Temperatur und/oder Innendruck zurückzuführen sind, auszugleichen, indem ein dem Innenbehälter zugeordnetes Teil des Loslagers gegenüber einem dem Außenbehälter zugeordneten Teil des Loslagers zumindest geringfügig verlagerbar ist. Dabei werden mittels einer im Loslager vorgesehenen Messvorrichtung die Lageänderungen des dem Innenbehälter zugeordneten Loslager-Teils gegenüber dem fest mit dem Außenbehälter verbundenen Loslager-Teil erfasst und es wird aus diesen Lageänderungen anhand einer in einer elektronischen Steuereinheit hinterlegten Zuordnung auf die im Innenbehälter enthaltene Masse des gespeicherten Mediums geschlossen wird. Vorzugsweise wurde die Zuordnung experimentell bestimmt.The invention relates to a method for determining the mass of the medium stored in a cryopressure tank, the cryopressank having an outer container and an inner container mounted within it via a fixed bearing and at least one movable bearing, in which said medium is cryogenic and under pressure values of the order of several a hundred bar is storable and or the movable bearing or is provided to compensate for changes in the dimensions of the inner container, which are due to changes in its temperature and / or internal pressure, by a the inner container associated part of the movable bearing against a part associated with the outer container the movable bearing is at least slightly displaced. In this case, by means of a measuring device provided in the movable bearing the changes in position of the inner container associated movable bearing part relative to the permanently connected to the outer container movable bearing part detected and it is stored from these changes based on a stored in an electronic control unit allocation to the mass contained in the inner container Medium is closed. Preferably, the assignment was determined experimentally.
Description
Die Erfindung betrifft ein Verfahren zum Bestimmen der Masse des in einem Kryodrucktank gespeicherten Mediums, wobei der Kryodrucktank einen Außenbehälter und einen innerhalb dessen über ein Festlager und zumindest ein Loslager gelagerten Innenbehälter aufweist, in welchem das besagte Medium tiefkalt und unter Druckwerten in der Größenordnung von mehreren hundert Bar speicherbar ist, und das oder die Loslager vorgesehen ist oder sind, um Änderungen der Abmessungen des Innenbehälters, welche auf Änderungen von dessen Temperatur und/oder Innendruck zurückzuführen sind, auszugleichen, indem ein dem Innenbehälter zugeordnetes Teil des Loslagers gegenüber einem dem Außenbehälter zugeordneten Teil des Loslagers zumindest geringfügig verlagerbar ist. Zum Stand der Technik wird neben der
Zur Speicherung eines unter Umgebungsbedingungen gasförmigen Mediums, bei welchem es sich in Verbindung mit der vorliegenden Erfindung insbesondere um Wasserstoff handeln kann, ist neben der kroygenen Speicherung die Kryodruckspeicherung bekannt. Während bei der kryogenen Speicherung das besagte Medium bei vollständig oder annähernd vollständig befülltem Tank „nur” mit einer Temperatur nahe des absoluten Nullpunktes (in der Größenordnung von 20 Kelvin) gespeichert wird, (vgl. hierzu die oben zweitgenannte
An Tanks zur Speicherung flüssiger oder gasförmiger Medien, aus denen bei Bedarf Teilmengen dieses Mediums entnommen werden, und somit auch an einem Kryodrucktank, ist es erwünscht, die aktuell im Tank befindliche Medium-Masse zu kennen, beispielsweise wenn der Kryodrucktank in einem Kraftfahrzeug zur Speicherung von Wasserstoff eingesetzt ist, welcher direkt oder indirekt (nämlich unter Zwischenschaltung einer Brennstoffzelle) zur Versorgung eines Antriebsaggregats des Fahrzeugs dient. Zwar kann hierbei die gezielt aus dem Tank entnommene Masse von Medium kontinuierlich verfolgt werden, jedoch ist eine solche Betrachtung alleine zu ungenau, weswegen eine direkte Bestimmung der aktuell im Tank befindlichen Medium-Masse (im Weiteren wird nur mehr von Wasserstoff als zu speichernden Medium gesprochen ohne hierdurch die Erfindung hierauf beschränken zu wollen) benötigt wird. Letzeres kann entweder durch Wiegen erfolgen, was bei Einsatz im Kraftfahrzeug nicht sinnvoll darstellbar ist oder durch Messung von Druck und Temperatur des im Tank gespeicherten Wasserstoffs. Hierfür kann ein Temperatursensor am Innenbehälter und ein Drucksensor geeignet an bzw. in einer den Wasserstoff aus dem Innenbehälter nach außen führenden Leitung angeordnet sein.On tanks for storing liquid or gaseous media, from which subsets of this medium are removed if necessary, and thus also on a cryogenic pressure tank, it is desirable to know the currently located in the tank medium mass, for example, when the Kryodrucktank in a motor vehicle for storage is used by hydrogen, which serves directly or indirectly (namely, with the interposition of a fuel cell) to supply a drive unit of the vehicle. Although in this case the mass of medium which has been deliberately removed from the tank can be continuously monitored, such a consideration alone is too inaccurate, which is why a direct determination of the medium mass currently in the tank is given (in the following, only hydrogen is spoken of as the medium to be stored without thereby wanting to limit the invention to this) is needed. The latter can be done either by weighing, which is not meaningful displayed when used in the vehicle or by measuring the pressure and temperature of the stored hydrogen in the tank. For this purpose, a temperature sensor on the inner container and a pressure sensor can be suitably arranged on or in a line leading the hydrogen out of the inner container.
Nicht ideal ist derzeit insbesondere die Bestimmung der Temperatur des im Innenbehälter befindlichen Wasserstoffs aus mehreren Gründen. Zum einen ist insbesondere bei der Kryodruckspeicherung innerhalb der im Innenbehälter gespeicherten Wasserstoffmenge eine inhomogene Temperatur-Verteilung zu beobachten, und zum anderen stellt ein Messkabel, welches die Messwerte des Temperatursensors elektrisch/elektronisch nach außen führt, einen unerwünschten Wärmeleitpfad dar, über den ein Wärmeeintrag von außen zum wünschenswerterweise möglich lange so kalt als möglich zu haltenden Innenbehälter erfolgt.In particular, the determination of the temperature of the hydrogen present in the inner container is not ideal at present for a number of reasons. On the one hand, an inhomogeneous temperature distribution can be observed especially in the case of cryopreservation within the quantity of hydrogen stored in the inner container, and on the other hand, a measuring cable which leads the measured values of the temperature sensor electrically / electronically to the outside represents an undesirable heat conduction path via which heat is introduced outside for desirably possible long as cold as possible to be held inner container.
Die eingangs genannte
Ausgehend vom soweit erläuterten Stand der Technik ist es Aufgabe der vorliegenden Erfindung, für einen Kryodrucktank mit den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen ein verbessertes Verfahren zum Bestimmen der Masse des darin gespeicherten Mediums, beispielsweise Wasserstoffs, aufzuzeigen.Starting from the state of the art explained so far, it is an object of the present invention to provide an improved method for determining the mass of the medium stored therein, for example hydrogen, for a cryogenic pressure tank having the features specified in the preamble of
Die Lösung dieser Aufgabe ist dadurch gekennzeichnet, dass mittels einer im Loslager vorgesehenen Messvorrichtung die Lageänderungen des dem Innenbehälter zugeordneten Loslager-Teils gegenüber dem fest mit dem Außenbehälter verbundenen Loslager-Teil erfasst werden und aus diesen Lageänderungen anhand einer in einer elektronischen Steuereinheit hinterlegten Zuordnung auf die im Innenbehälter enthaltene Masse des gespeicherten Mediums geschlossen wird. Dabei kann die besagte Zuordnung experimentell bestimmt und in einer elektronischen Steuereinheit geeignet hinterlegt sein, in welcher anhand von Lageänderungen im Loslager, die für diese Steuereinheit mittels einer Messvorrichtung feststellbar sind, sowie anhand der hinterlegten Zuordnung die im Innenbehälter enthaltene Masse von gespeichertem Medium bestimmt wird. Dabei können mit besonders hoher Genauigkeit Änderungen der Lage und somit der Abmessungen des Innenbehälters und damit auch der in diesem enthaltenen Masse von gespeichertem Medium gegenüber einem bekannten Ausgangszustand festgestellt werden; mit ausreichender Datengrundlage ist es aber auch möglich, einen Rückschluss auf die absolute im Innenbehälter enthaltene Wasserstoff-Masse zu ziehen. The solution to this problem is characterized in that by means of a measuring device provided in the movable bearing position changes of the inner container associated movable bearing part relative to the permanently connected to the outer container movable bearing part are detected and these changes based on a stored in an electronic control unit assignment to the contained in the inner container mass of the stored medium is closed. In this case, the said assignment can be determined experimentally and suitably deposited in an electronic control unit in which the mass of stored medium contained in the inner container is determined on the basis of changes in position in the movable bearing, which are detectable for this control unit by means of a measuring device. It can be determined with a particularly high accuracy changes in the position and thus the dimensions of the inner container and thus also the mass of stored medium contained in this compared to a known initial state; but with sufficient data, it is also possible to draw a conclusion on the absolute hydrogen mass contained in the inner container.
Vorliegend wurde erkannt, dass sich bei einem Kryodrucktank mit einem Innenbehälter, welcher einerseits in der Lage ist, einem Innendruck von beispielsweise 200 bar oder mehr standzuhalten und der andererseits ausreichend leicht aufgebaut und nur über ein Festlager sowie ein oder mehrere Loslager in einem Außenbehälter (unter Bildung einer dazwischen liegenden Vakuum-Isolationsschicht aufgehängt ist, anders als bei „einfachen” Kryotanks nicht nur Temperatur-Änderungen sondern auch Änderungen des Behälter-Innendrucks in Änderungen der Abmessungen des Innenbehälters widerspiegeln, so dass über Lageänderungen in dem oder in den Loslager(n), welche aus den geänderten Abmessungen resultieren, die Gesamtheit von Temperatur-Änderungen und Druck-Änderungen feststellbar ist. Alleine mit diesen Lageänderungen in dem oder den Loslager(n) oder unter Berücksichtigung zumindest einer weiteren Messgröße ist somit die Masse der im Innenbehälter enthaltenen Wasserstoffmenge bestimmbar, wenn die besagte Zuordnung bekannt ist. Als weitere Messgröße kann dabei vorzugsweise der Druck des in einer vom Innenbehälter nach außen führenden Leitung geführten und aus dem Innenbehälter entnommenen Wasserstoffs verwendet werden, der wie weiter oben erläutert wurde einfacher und genauer messbar ist als die Messung der Temperatur des im Tank gespeicherten Wasserstoffs.In the present case, it was recognized that in a Kryodrucktank with an inner container, which on the one hand is able to withstand an internal pressure of, for example, 200 bar or more and on the other hand sufficiently light and constructed only one fixed bearing and one or more floating bearings in an outer container (under Forming an intermediate vacuum insulation layer is suspended, unlike "simple" cryotanks reflect not only temperature changes but also changes in the container internal pressure in changes in the dimensions of the inner container, so that about changes in position in or in the floating bearing (s) , which result from the changed dimensions, the entirety of temperature changes and pressure changes can be determined alone with these changes in position in the movable bearing (s) or taking into account at least one further measured variable thus the mass of the hydrogen contained in the inner container is best immaterial, if said assignment is known. As a further measured variable, the pressure of the hydrogen conducted in a line leading from the inner container to the outside and taken out of the inner container can be used which, as explained above, is easier and more accurately measurable than the measurement of the temperature of the hydrogen stored in the tank.
Die beigefügte Prinzipskizze zeigt einen Kryodrucktank, an dem das erfindungsgemäße Verfahren durchführbar ist.The attached schematic diagram shows a Kryodrucktank on which the inventive method is feasible.
Mit der Bezugsziffer
Eine Leitung
Neben der genannten Druck-Meßstelle
Lediglich der Vollständigkeit halber seien noch die Aufhängungen
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- EP 2217845 B1 [0001, 0002] EP 2217845 B1 [0001, 0002]
- DE 10128516 A1 [0001, 0002, 0005] DE 10128516 A1 [0001, 0002, 0005]
Claims (3)
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DE102013214044.4A DE102013214044A1 (en) | 2013-07-17 | 2013-07-17 | A method for determining the mass of the medium stored in a cryopressure tank |
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DE102013214044.4A DE102013214044A1 (en) | 2013-07-17 | 2013-07-17 | A method for determining the mass of the medium stored in a cryopressure tank |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3064043A1 (en) * | 2017-03-17 | 2018-09-21 | Cryolor | LIQUEFIED FLUID STORAGE TANK |
WO2019158395A1 (en) * | 2018-02-16 | 2019-08-22 | Bundesrepublik Deutschland, Vertreten Durch Die Bundesministerin Für Wirtschaft Und Energie, Diese Vertreten Durch Den Präsidenten Der Bundesanstalt Für Materialforschung Und -Prüfung (Bam) | Device for filling gas holders |
US11387787B2 (en) | 2017-04-28 | 2022-07-12 | Burmester Audiosysteme Gmbh | Signal amplifier circuit, voltage converter and system |
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DE3309672C1 (en) * | 1983-03-17 | 1984-05-24 | Cit-Alcatel GmbH, 6980 Wertheim | Device for level monitoring of a double-walled container for cryogenic liquids |
FR2562246A1 (en) * | 1984-03-29 | 1985-10-04 | Air Liquide | Double-envelope tank for cryogenic liquid |
DE10128516A1 (en) | 2001-06-13 | 2002-12-19 | Linde Ag | Container, in particular for storing cryogenic liquids primarily liquid hydrogen, comprises outer and inner containers joined to one another by at least two suspension units incorporating hinged bars |
EP2217845B1 (en) | 2007-12-03 | 2011-04-27 | Bayerische Motoren Werke Aktiengesellschaft | Operating method for a cryopressure tank |
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2013
- 2013-07-17 DE DE102013214044.4A patent/DE102013214044A1/en not_active Withdrawn
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DE3309672C1 (en) * | 1983-03-17 | 1984-05-24 | Cit-Alcatel GmbH, 6980 Wertheim | Device for level monitoring of a double-walled container for cryogenic liquids |
FR2562246A1 (en) * | 1984-03-29 | 1985-10-04 | Air Liquide | Double-envelope tank for cryogenic liquid |
DE10128516A1 (en) | 2001-06-13 | 2002-12-19 | Linde Ag | Container, in particular for storing cryogenic liquids primarily liquid hydrogen, comprises outer and inner containers joined to one another by at least two suspension units incorporating hinged bars |
EP2217845B1 (en) | 2007-12-03 | 2011-04-27 | Bayerische Motoren Werke Aktiengesellschaft | Operating method for a cryopressure tank |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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FR3064043A1 (en) * | 2017-03-17 | 2018-09-21 | Cryolor | LIQUEFIED FLUID STORAGE TANK |
US11387787B2 (en) | 2017-04-28 | 2022-07-12 | Burmester Audiosysteme Gmbh | Signal amplifier circuit, voltage converter and system |
WO2019158395A1 (en) * | 2018-02-16 | 2019-08-22 | Bundesrepublik Deutschland, Vertreten Durch Die Bundesministerin Für Wirtschaft Und Energie, Diese Vertreten Durch Den Präsidenten Der Bundesanstalt Für Materialforschung Und -Prüfung (Bam) | Device for filling gas holders |
CN111936783A (en) * | 2018-02-16 | 2020-11-13 | 由联邦材料研究和检测机构主席所代表的经济与能源部长所代表的德意志联邦共和国 | Device for filling gas storage tanks |
JP2021514044A (en) * | 2018-02-16 | 2021-06-03 | ブンデスリパブリック ドイチュラント、バートリィトン ドエヒ デン ブンデスミニスター ファ ヴィルトシャフト ウント エネルジー、ディザ バートリィトン ドエヒ デン プレジデンテン デァ ブンデスアンスタルツ ファ マトリアルフォシュン ウント−プロフン (ビーエーエム) | Equipment for filling gas storage tanks |
JP7124878B2 (en) | 2018-02-16 | 2022-08-24 | ブンデスリパブリック ドイチュラント、バートリィトン ドエヒ デン ブンデスミニスター ファ ヴィルトシャフト ウント エネルジー、ディザ バートリィトン ドエヒ デン プレジデンテン デァ ブンデスアンスタルツ ファ マトリアルフォシュン ウント-プロフン (ビーエーエム) | Apparatus for filling gas storage tanks |
US11913605B2 (en) | 2018-02-16 | 2024-02-27 | Bundesrepublik Deutschland, vertreten durch die Bundesministerin für Wirtschaft und Energie | Filling gas storage tanks |
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