EP0625630B1 - Autonomous energy supply device for a gas driven apparatus and its use in a freezing plant - Google Patents

Autonomous energy supply device for a gas driven apparatus and its use in a freezing plant Download PDF

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Publication number
EP0625630B1
EP0625630B1 EP19940400685 EP94400685A EP0625630B1 EP 0625630 B1 EP0625630 B1 EP 0625630B1 EP 19940400685 EP19940400685 EP 19940400685 EP 94400685 A EP94400685 A EP 94400685A EP 0625630 B1 EP0625630 B1 EP 0625630B1
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EP
European Patent Office
Prior art keywords
tank
pump
cryogenic liquid
valve
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19940400685
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German (de)
French (fr)
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EP0625630A1 (en
Inventor
Jean-Pierre Germain
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Publication of EP0625630A1 publication Critical patent/EP0625630A1/en
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Publication of EP0625630B1 publication Critical patent/EP0625630B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0119—Shape cylindrical with flat end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/01—Reinforcing or suspension means
    • F17C2203/011—Reinforcing means
    • F17C2203/013—Reinforcing means in the vessel, e.g. columns
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/0393—Localisation of heat exchange separate using a vaporiser

Definitions

  • the present invention relates to a device for supplying energy to a pneumatic device driven by a pressurized gas and, more particularly, to such a device making it possible to ensure the autonomy of such a device, of the type comprising a transportable cryogenic liquid reservoir and means associated with the reservoir for withdrawing and vaporizing liquid from the reservoir and addressing it to the user device.
  • the object of the present invention is to provide an improved device of this type, of a simplified and robust design, of increased reliability and which can be used for numerous diverse applications.
  • the withdrawal and vaporization means comprise at least one portion of the circuit incorporating a vaporization means and delimited between a non-return valve upstream and a valve controlled downstream.
  • Another object of the present invention is to propose an application of this device to the supply of cryogenic liquid to a freezing installation, in particular for freezing food products.
  • a reservoir 1 of cryogenic liquid conventionally comprising a double wall 1 1 , 1 2 , the internal wall 1 2 containing the cryogenic liquid, liquid nitrogen for example.
  • two serpentine conduits 2 1 and 2 2 are connected at 3 to the bottom of the wall 1 2 of the tank to draw cryogenic liquid contained in the tank.
  • On each conduit 2 1 , 2 2 are fitted, respectively, non-return valves 4 1 , 4 2 , evaporators 5 1 , 5 2 and controlled valves 6 1 , 6 2 .
  • the conduits 2 1 and 2 2 are thus mounted in parallel between the withdrawal point 3 and the inlet 7 1 of engine gas from an apparatus 7 such as a pump or any pneumatic tool.
  • this device is constituted by a pump 7 immersed in the cryogenic liquid from the reservoir to discharge this liquid into a supply duct 8 of an installation using a such liquid.
  • this installation can be that described in European patent application No. 505 222 filed in the name of the applicant, used for freezing food products.
  • the conduits 2 1 and 2 2 and the associated members are arranged between the two walls 1 1 and 1 2 of the tank so as to constitute a transportable whole, possibly using handles 18 1 , 18 2 .
  • the conduits 2 1 and 2 2 are used to vaporize the liquid withdrawn at 3 from this tank. It is understood that the liquid withdrawn having passed through the non-return valve 4 1 for example, flows into the evaporator 5 1 . This can be formed, for example, by a capacity loaded with metal chips. The cryogenic liquid then flows in thin films on the surface of these chips, thereby establishing a large evaporation surface for liquid nitrogen.
  • the vaporized nitrogen then spreads in the coil from the non-return valve 4 1 to the valve 6 1 supposed to be closed.
  • the increasing pressure of nitrogen on the valve prevents it from opening and this pressure can then continue to increase in the closed enclosure delimited in the conduit between the valve 4 1 and the closed valve 6 1 , until that a suitable pressure is established, 6 bars for example for the pump 7.
  • a suitable pressure 6 bars for example for the pump 7.
  • the vaporization of the nitrogen in the pipe 2 1 takes a certain time and that, after the opening of the valve 6 1 , the pressure of the nitrogen gas supplied to the pump begins to decrease, possibly up to a value not suitable for the pump supply.
  • the device according to the invention therefore comprises means for controlling the valves 6 1 , 6 2 .
  • These means may include, as shown in the drawing, a pneumatic reverser 9 supplied with pressurized gas by a line 10 pitted on the circuit 2 1 for example with return to the tank above the free surface of liquid nitrogen, a valve 11 with manual closure being arranged on this line.
  • a pneumatic reverser 9 supplied with pressurized gas by a line 10 pitted on the circuit 2 1 for example with return to the tank above the free surface of liquid nitrogen, a valve 11 with manual closure being arranged on this line.
  • this valve is opened.
  • the switching frequency of the inverter 9 is adjusted by an electronic unit 12, as a function of the time of vaporization of the nitrogen in each of the two circuits 2 1 , 2 2 .
  • This box can also be supplied by signals P 1 , P 2 representative of the pressures prevailing in the circuits 2 1 , 2 2 , respectively, to adjust the frequency of tilting of the inverter so as to best ensure the continuity of the supply of engine gas to the pump 7 at a suitable predetermined pressure.
  • the device according to the invention also comprises a line 13 provided with a pressure regulator 14 and connected between the circuit 2 1 for example, and the reservoir to maintain above the free surface of the liquid nitrogen at a predetermined pressure, for example 0.7 bar, so as to facilitate the flow of liquid nitrogen in the vaporization ducts.
  • a pressure regulator 14 connected between the circuit 2 1 for example, and the reservoir to maintain above the free surface of the liquid nitrogen at a predetermined pressure, for example 0.7 bar, so as to facilitate the flow of liquid nitrogen in the vaporization ducts.
  • safety valves 15, 16, 17 are mounted respectively on the circuits 2 1 , 2 2 and on the tank.
  • the invention makes it possible to ensure the complete autonomy of a cryogenic liquid supply source, with a pump submerged in the tank.
  • the invention is not limited to the embodiment described and shown which has been given only by way of example.
  • the device according to the invention could just as easily supply engine gas to an appliance external to the tank.
  • more than two serpentine circuits could be provided between the two walls of the tank to further smooth the pressure of the engine gas delivered by the device according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Description

La présente invention est relative à un dispositif d'alimentation en énergie d'un appareil pneumatique animé par un gaz sous pression et, plus particulièrement, à un tel dispositif permettant d'assurer l'autonomie d'un tel appareil, du type comprenant un réservoir transportable du liquide cryogénique et des moyens associés au réservoir pour soutirer et vaporiser du liquide du réservoir et l'adresser à l'appareil utilisateur.The present invention relates to a device for supplying energy to a pneumatic device driven by a pressurized gas and, more particularly, to such a device making it possible to ensure the autonomy of such a device, of the type comprising a transportable cryogenic liquid reservoir and means associated with the reservoir for withdrawing and vaporizing liquid from the reservoir and addressing it to the user device.

Un dispositif de ce type est décrit dans le document US-A-4,838,034.A device of this type is described in document US-A-4,838,034.

La présente invention a pour objet de proposer un dispositif perfectionné de ce type, de conception simplifiée et robuste, de fiabilité accrue et pouvant servir à de nombreuses applications diversifiées.The object of the present invention is to provide an improved device of this type, of a simplified and robust design, of increased reliability and which can be used for numerous diverse applications.

Pour ce faire, selon une caractéristique de l'invention, les moyens de soutirage et de vaporisation comportent au moins une portion de circuit incorporant un moyen de vaporisation et délimitée entre un clapet anti-retour en amont et une vanne commandée en aval.To do this, according to a characteristic of the invention, the withdrawal and vaporization means comprise at least one portion of the circuit incorporating a vaporization means and delimited between a non-return valve upstream and a valve controlled downstream.

La présente invention a également pour objet de proposer une application de ce dispositif à l'alimentation en liquide cryogénique d'une installation de congélation, en particulier de congélation de produits alimentaires.Another object of the present invention is to propose an application of this device to the supply of cryogenic liquid to a freezing installation, in particular for freezing food products.

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre et à l'examen du dessin annexé dans lequel la figure unique représente schématiquement le dispositif d'alimentation suivant l'invention.Other characteristics and advantages of the present invention will appear on reading the description which follows and on examining the appended drawing in which the single figure schematically represents the supply device according to the invention.

Sur cette figure, on a représenté en coupe axiale un réservoir 1 de liquide cryogénique, comprenant classiquement une double paroi 11,12, la paroi interne 12 contenant le liquide cryogénique, de l'azote liquide par exemple.In this figure, there is shown in axial section a reservoir 1 of cryogenic liquid, conventionally comprising a double wall 1 1 , 1 2 , the internal wall 1 2 containing the cryogenic liquid, liquid nitrogen for example.

Suivant l'invention, deux conduits à serpentin 21 et 22 sont raccordés en 3 au fond de la paroi 12 du réservoir pour soutirer du liquide cryogénique contenu dans le réservoir. Sur chaque conduit 21,22 sont montés, respectivement, des clapets anti-retour 41,42, des évaporateurs 51,52 et des vannes commandées 61,62. Les conduits 21 et 22 sont ainsi montés en parallèle entre le point de soutirage 3 et l'entrée 71 de gaz moteur d'un appareil 7 tel qu'une pompe ou un outil pneumatique quelconque. Dans le mode de réalisation représenté à la figure, donné seulement à titre d'exemple, cet appareil est constitué par une pompe 7 immergée dans le liquide cryogénique du réservoir pour refouler ce liquide dans un conduit d'alimentation 8 d'une installation utilisant un tel liquide. Toujours à titre d'exemple, cette installation peut être celle décrite à la demande de brevet européen No. 505 222 déposée au nom de la demanderesse, utilisée pour la congélation de produits alimentaires.According to the invention, two serpentine conduits 2 1 and 2 2 are connected at 3 to the bottom of the wall 1 2 of the tank to draw cryogenic liquid contained in the tank. On each conduit 2 1 , 2 2 are fitted, respectively, non-return valves 4 1 , 4 2 , evaporators 5 1 , 5 2 and controlled valves 6 1 , 6 2 . The conduits 2 1 and 2 2 are thus mounted in parallel between the withdrawal point 3 and the inlet 7 1 of engine gas from an apparatus 7 such as a pump or any pneumatic tool. In the embodiment shown in the figure, given only by way of example, this device is constituted by a pump 7 immersed in the cryogenic liquid from the reservoir to discharge this liquid into a supply duct 8 of an installation using a such liquid. Still by way of example, this installation can be that described in European patent application No. 505 222 filed in the name of the applicant, used for freezing food products.

Avantageusement, les conduits 21 et 22 et les organes associés sont disposés entre les deux parois 11 et 12 du réservoir de manière à constituer un tout transportable, éventuellement à l'aide de poignées 181,182. Les conduits 21 et 22 servent à vaporiser du liquide soutiré en 3 de ce réservoir. On comprend que le liquide soutiré ayant franchi le clapet anti-retour 41 par exemple, s'écoule dans l'évaporateur 51. Celui-ci peut être constitué, par exemple, par une capacité chargée de copeaux métalliques. Le liquide cryogénique s'écoule alors en films minces sur la surface de ces copeaux en établissant ainsi une grande surface d'évaporation pour l'azote liquide.Advantageously, the conduits 2 1 and 2 2 and the associated members are arranged between the two walls 1 1 and 1 2 of the tank so as to constitute a transportable whole, possibly using handles 18 1 , 18 2 . The conduits 2 1 and 2 2 are used to vaporize the liquid withdrawn at 3 from this tank. It is understood that the liquid withdrawn having passed through the non-return valve 4 1 for example, flows into the evaporator 5 1 . This can be formed, for example, by a capacity loaded with metal chips. The cryogenic liquid then flows in thin films on the surface of these chips, thereby establishing a large evaporation surface for liquid nitrogen.

L'azote vaporisé se répand alors dans le serpentin depuis le clapet anti-retour 41 jusqu'à la vanne 61 supposée fermée. La pression croissante de l'azote sur le clapet empêche celui-ci de s'ouvrir et cette pression peut alors continuer à croître dans l'enceinte fermée délimitée dans le conduit entre le clapet 41 et la vanne fermée 61, jusqu'à ce qu'une pression convenable soit établie, de 6 bars par exemple pour la pompe 7. Quand cette pression est atteinte, il y a ouverture de la vanne commandée 61 et le gaz contenu dans le conduit 21 alimente la partie motrice de la pompe 7 qui refoule de l'azote liquide dans le conduit 8.The vaporized nitrogen then spreads in the coil from the non-return valve 4 1 to the valve 6 1 supposed to be closed. The increasing pressure of nitrogen on the valve prevents it from opening and this pressure can then continue to increase in the closed enclosure delimited in the conduit between the valve 4 1 and the closed valve 6 1 , until that a suitable pressure is established, 6 bars for example for the pump 7. When this pressure is reached, there is opening of the controlled valve 6 1 and the gas contained in the conduit 2 1 feeds the driving part of the pump 7 which delivers liquid nitrogen into line 8.

On comprend que la vaporisation de l'azote dans le conduit 21 prend un certain temps et que, après l'ouverture de la vanne 61, la pression de l'azote gazeux fourni à la pompe commence à redescendre, éventuellement jusqu'à une valeur ne convenant pas à l'alimentation de la pompe.It is understood that the vaporization of the nitrogen in the pipe 2 1 takes a certain time and that, after the opening of the valve 6 1 , the pressure of the nitrogen gas supplied to the pump begins to decrease, possibly up to a value not suitable for the pump supply.

Grâce à la présence, suivant l'invention, d'au moins un autre conduit à serpentin tel que 22, on peut néanmoins assurer une alimentation continue de la pompe 7 en gaz moteur, à une pression prédéterminée convenable.Thanks to the presence, according to the invention, of at least one other serpentine duct such as 2 2 , it is nevertheless possible to ensure a continuous supply of the pump 7 with engine gas, at a suitable predetermined pressure.

En effet, si alors que la vanne 61 est ouverte pour alimenter la pompe, la vanne 62 est fermée, les phénomènes de soutirage et de vaporisation décrits ci-dessus se produisent dans le conduit à serpentin 22, avec formation dans ce conduit d'azote gazeux à une pression croissante. En commutant l'alimentation de la pompe sur le conduit 22 quand la pression dans ce conduit atteint une valeur prédéterminée convenant à l'alimentation de la pompe, alors que la pression dans le conduit 21 s'est abaissée en dessous de cette valeur, on assure une alimentation continue de la pompe avec un gaz à une pression convenable, en inversant périodiquement l'état des vannes commandées 61,62.Indeed, if while the valve 6 1 is open to supply the pump, the valve 6 2 is closed, the withdrawal and vaporization phenomena described above occur in the coil duct 2 2 , with formation in this duct nitrogen gas at increasing pressure. By switching the supply of the pump to the pipe 2 2 when the pressure in this pipe reaches a predetermined value suitable for supplying the pump, while the pressure in the pipe 2 1 has dropped below this value , a continuous supply of the pump is ensured with a gas at a suitable pressure, by periodically reversing the state of the controlled valves 6 1 , 6 2 .

Le dispositif suivant l'invention comprend donc des moyens de commande des vannes 61,62. Ces moyens peuvent comprendre comme représenté au dessin, un inverseur pneumatique 9 alimenté en gaz sous pression par une ligne 10 piquée sur le circuit 21 par exemple avec retour dans le réservoir au-dessus de la surface libre de l'azote liquide, une vanne 11 à fermeture manuelle étant disposée sur cette ligne. A la mise en service du dispositif suivant l'invention, on ouvre cette vanne. La fréquence de basculement de l'inverseur 9 est réglée par un boîtier électronique 12, en fonction du temps de vaporisation de l'azote dans chacun des deux circuits 21,22. Ce boîtier peut aussi être alimenté par des signaux P1,P2 représentatifs des pressions régnant dans les circuits 21,22, respectivement, pour ajuster la fréquence de basculement de l'inverseur de manière à assurer au mieux la continuité de l'alimentation de la pompe 7 en gaz moteur, à une pression prédéterminée convenable.The device according to the invention therefore comprises means for controlling the valves 6 1 , 6 2 . These means may include, as shown in the drawing, a pneumatic reverser 9 supplied with pressurized gas by a line 10 pitted on the circuit 2 1 for example with return to the tank above the free surface of liquid nitrogen, a valve 11 with manual closure being arranged on this line. When the device according to the invention is put into service, this valve is opened. The switching frequency of the inverter 9 is adjusted by an electronic unit 12, as a function of the time of vaporization of the nitrogen in each of the two circuits 2 1 , 2 2 . This box can also be supplied by signals P 1 , P 2 representative of the pressures prevailing in the circuits 2 1 , 2 2 , respectively, to adjust the frequency of tilting of the inverter so as to best ensure the continuity of the supply of engine gas to the pump 7 at a suitable predetermined pressure.

On remarquera, accessoirement, que le dispositif suivant l'invention comprend encore une ligne 13 munie d'un régulateur de pression 14 et connectée entre le circuit 21 par exemple, et le réservoir pour maintenir au-dessus de la surface libre de l'azote liquide une pression prédéterminée, de 0,7 bar par exemple, de manière à faciliter l'écoulement d'azote liquide dans les conduits de vaporisation. Par ailleurs, des soupapes de sécurité 15,16,17 sont montées respectivement sur les circuits 21,22 et sur le réservoir.It will be noted, incidentally, that the device according to the invention also comprises a line 13 provided with a pressure regulator 14 and connected between the circuit 2 1 for example, and the reservoir to maintain above the free surface of the liquid nitrogen at a predetermined pressure, for example 0.7 bar, so as to facilitate the flow of liquid nitrogen in the vaporization ducts. Furthermore, safety valves 15, 16, 17 are mounted respectively on the circuits 2 1 , 2 2 and on the tank.

Il ressort de la description qui précède que l'invention permet d'assurer l'autonomie complète d'une source d'alimentation en liquide cryogénique, à pompe immergée dans le réservoir. Bien entendu, cependant, l'invention n'est pas limitée au mode de réalisation décrit et représenté qui n'a été donné qu'à titre d'exemple. Ainsi, il est clair que le dispositif suivant l'invention pourrait tout aussi bien alimenter en gaz moteur un appareil extérieur au réservoir. De même on pourrait prévoir entre les deux parois du réservoir plus de deux circuits à serpentin pour lisser encore la pression du gaz moteur délivré par le dispositif suivant l'invention.It appears from the foregoing description that the invention makes it possible to ensure the complete autonomy of a cryogenic liquid supply source, with a pump submerged in the tank. Of course, however, the invention is not limited to the embodiment described and shown which has been given only by way of example. Thus, it is clear that the device according to the invention could just as easily supply engine gas to an appliance external to the tank. Similarly, more than two serpentine circuits could be provided between the two walls of the tank to further smooth the pressure of the engine gas delivered by the device according to the invention.

Claims (6)

  1. Autonomous device for supplying energy to an apparatus (7) driven by a gas under pressure, comprising a transportable cryogenic liquid tank (1) and means associated with the tank for drawing off and vaporizing the liquid in the tank and sending it to the apparatus (7), characterized in that the drawing-off and vaporizing means include at least one circuit portion (21, 22) which incorporates a vaporizing means (51, 52) and is delimited between a non-return valve (41, 42) upstream and a controlled valve (61, 62) downstream.
  2. Device according to Claim 1, characterized in that the tank (1) is of the double-wall (11, 12) type, at least one upstream part of the circuit portion (21, 22) being arranged between the said walls (11, 12).
  3. Device according to either of Claims 1 and 2, characterized in that it includes two circuit portions (21, 22) in parallel, the respective valves (61, 62) of which are sequentially controlled by a control device (9, 12).
  4. Device according to Claim 3, characterized in that the control device (9, 12) is sensitive to the pressure (P1; P2) existing in the circuit portion (21; 22).
  5. Device according to one of Claims 1 to 4, characterized in that the apparatus (7) is a pump for delivering the cryogenic liquid contained in the tank (1).
  6. Application of a device according to Claim 5 to the supplying of cryogenic liquid to a plant for freezing foodstuffs.
EP19940400685 1993-04-16 1994-03-30 Autonomous energy supply device for a gas driven apparatus and its use in a freezing plant Expired - Lifetime EP0625630B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9304501A FR2704026B1 (en) 1993-04-16 1993-04-16 Autonomous device for supplying energy to a pneumatic device driven by a pressurized gas.
FR9304501 1993-04-16

Publications (2)

Publication Number Publication Date
EP0625630A1 EP0625630A1 (en) 1994-11-23
EP0625630B1 true EP0625630B1 (en) 1997-07-09

Family

ID=9446141

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940400685 Expired - Lifetime EP0625630B1 (en) 1993-04-16 1994-03-30 Autonomous energy supply device for a gas driven apparatus and its use in a freezing plant

Country Status (8)

Country Link
US (1) US5442927A (en)
EP (1) EP0625630B1 (en)
JP (1) JPH06307599A (en)
BR (1) BR9401492A (en)
DE (1) DE69404085T2 (en)
DK (1) DK0625630T3 (en)
ES (1) ES2104298T3 (en)
FR (1) FR2704026B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9724168D0 (en) 1997-11-14 1998-01-14 Air Prod & Chem Gas control device and method of supplying gas
GB2338034A (en) * 1998-09-29 1999-12-08 Lannanet Ltd A non combustible expanding gas motor
US6505469B1 (en) 2001-10-15 2003-01-14 Chart Inc. Gas dispensing system for cryogenic liquid vessels
GB0513463D0 (en) * 2005-07-01 2005-08-10 Highview Entpr Ltd Injection apparatus for cryogenic engines
GB2499815B (en) * 2012-02-29 2014-05-28 Siemens Plc Over-pressure limiting arrangement for a cryogen vessel

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2254587A (en) * 1937-11-09 1941-09-02 Linde Air Prod Co Apparatus for dispensing gas material
US3135099A (en) * 1961-12-08 1964-06-02 Air Reduction Vaporizing station for liquefied gas
US3451342A (en) * 1965-10-24 1969-06-24 Everett H Schwartzman Cryogenic engine system and method
US3987632A (en) * 1970-02-27 1976-10-26 Pereda Eugene F Liquid air engine
GB1454128A (en) * 1974-06-10 1976-10-27 Coal Industry Patents Ltd Pneumatic drive using revaporised liquefied-gas
US4676289A (en) * 1984-08-13 1987-06-30 Cherng Yi Su Automobile tire having retractable tread studs
US4838034A (en) * 1988-07-22 1989-06-13 International Cryogenics, Inc. Compressed-gas power source for portable gas-driven tools
US4899546A (en) * 1988-11-02 1990-02-13 Harsco Corporation Cryogenic liquid container
FR2655407B1 (en) * 1989-12-01 1993-10-29 Air Liquide TANK FOR CRYOENIC LIQUID.

Also Published As

Publication number Publication date
US5442927A (en) 1995-08-22
BR9401492A (en) 1994-10-25
DK0625630T3 (en) 1997-12-08
EP0625630A1 (en) 1994-11-23
FR2704026B1 (en) 1995-05-19
FR2704026A1 (en) 1994-10-21
JPH06307599A (en) 1994-11-01
DE69404085D1 (en) 1997-08-14
ES2104298T3 (en) 1997-10-01
DE69404085T2 (en) 1998-01-22

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