FR2906878A1 - Nitrogen supplying method, involves sending liquid nitrogen towards separating apparatus for partially maintaining cooling of apparatus, during operating period, and conveying liquid nitrogen flow to vaporizer during another period - Google Patents

Nitrogen supplying method, involves sending liquid nitrogen towards separating apparatus for partially maintaining cooling of apparatus, during operating period, and conveying liquid nitrogen flow to vaporizer during another period Download PDF

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Publication number
FR2906878A1
FR2906878A1 FR0752579A FR0752579A FR2906878A1 FR 2906878 A1 FR2906878 A1 FR 2906878A1 FR 0752579 A FR0752579 A FR 0752579A FR 0752579 A FR0752579 A FR 0752579A FR 2906878 A1 FR2906878 A1 FR 2906878A1
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FR
France
Prior art keywords
liquid nitrogen
nitrogen
vaporizer
storage
sent
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.)
Pending
Application number
FR0752579A
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French (fr)
Inventor
Benoit Davidian
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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Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Priority to FR0752579A priority Critical patent/FR2906878A1/en
Publication of FR2906878A1 publication Critical patent/FR2906878A1/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/044—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a single pressure main column system only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04254—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using the cold stored in external cryogenic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • F25J3/04824—Stopping of the process, e.g. defrosting or deriming; Back-up procedures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/0489—Modularity and arrangement of parts of the air fractionation unit, in particular of the cold box, e.g. pre-fabrication, assembling and erection, dimensions, horizontal layout "plot"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04763—Start-up or control of the process; Details of the apparatus used
    • F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
    • F25J3/04945—Details of internal structure; insulation and housing of the cold box
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/42—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream being nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/42—One fluid being nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/62—Details of storing a fluid in a tank

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The method involves generating nitrogen gas by an air separating apparatus i.e. cold box (9) of a cryogenic generator, and conveying the nitrogen gas to a consumer (12) after being passed in an emergency vaporizer (5). Liquid nitrogen of a liquid nitrogen storage (1) is sent towards the separating apparatus for partially maintaining cooling of the separating apparatus, during an operating period. A liquid nitrogen flow is conveyed to the vaporizer in which it is vaporized and the vaporized liquid nitrogen is conveyed to the customer during another operating period. An independent claim is also included for an apparatus for supplying nitrogen, comprising a liquid nitrogen storage.

Description

2906878 La présente invention est relative à un procédé et à un appareilThe present invention relates to a method and apparatus

de fourniture d'azote. Lorsqu'un client livré en azote liquide décide d'installer un générateur cryogénique de gaz à la place, il faut minimiser les connexions sur site.  nitrogen supply. When a customer delivering liquid nitrogen decides to install a cryogenic gas generator instead, site connections must be minimized.

Selon l'invention, la connexion entre le générateur cryogénique de gaz et son secours, en cas de défaillance, est réalisée en amont du système de vaporisation. Ceci permet de la réaliser à l'intérieur de l'équipement livré sur le site du client, et donc d'éviter de toucher à la partie vaporisation et tuyauterie vers le client. io Selon l'état de l'art , comme illustré à la Figure 1, chez le client sont installés : • un stockage d'azote liquide 1 ; • un système de vaporisation, généralement par évaporateur atmosphérique 5 ; 15 • une canalisation qui va chez le client 12. Une conduite 3 relie le stockage 1 avec le système de vaporisation 5. On peut éventuellement avoir un certain nombre d'équipements en entrée ou en sortie du système de vaporisation (non représenté sur la figure).  According to the invention, the connection between the cryogenic gas generator and its rescue, in case of failure, is performed upstream of the vaporization system. This makes it possible to realize it inside the equipment delivered on the site of the customer, and thus to avoid touching the part vaporization and piping towards the customer. According to the state of the art, as illustrated in FIG. 1, at the customer's premises are installed: a storage of liquid nitrogen 1; A vaporization system, generally by atmospheric evaporator 5; • a pipe that goes to the customer 12. A pipe 3 connects the storage 1 with the vaporization system 5. It may possibly have a number of equipment input or output of the vaporization system (not shown in FIG. ).

20 Selon l'état de l'art, comme illustré à la Figure 2, chez le client sont installés : • un stockage d'azote liquide 1 ; • un système de vaporisation, généralement par évaporateur atmosphérique 5 ; 25 • une canalisation qui va chez le client 12 ; • un générateur d'azote gazeux 9 alimenté en air refroidi et épuré par une conduite 10 et en liquide de biberonnage par une conduite 8 amenant du liquide du stockage 1. Le stockage existant de la Figure 1 reste en place, ainsi que 30 l'évaporateur, et dans la Figure 2 on ajoute à coté un générateur de gaz 9. Le générateur de gaz 9 est constitué par une simple colonne de séparation d'air produisant de l'azote gazeux 11 en tête de colonne.According to the state of the art, as illustrated in FIG. 2, at the customer's premises are installed: a storage of liquid nitrogen 1; A vaporization system, generally by atmospheric evaporator 5; 25 • a pipe that goes to the customer 12; A nitrogen gas generator 9 supplied with air cooled and purified by a pipe 10 and with a liquid-feeding liquid through a pipe 8 supplying liquid from the storage 1. The existing storage of FIG. 1 remains in place, as well as evaporator, and in Figure 2 is added next to a gas generator 9. The gas generator 9 is constituted by a single air separation column producing nitrogen gas 11 at the top of the column.

2 2906878 Cela nécessite : • d'ajouter une connexion d'azote liquide 8 vers le générateur cryogénique 9 (maintien en froid par biberonnage), ce qui est assez facile à faire, car le stockage 1 est généralement équipé d'au moins deux sorties ; 5 • de modifier la canalisation vers le client en aval du système de vaporisation en ajoutant un piquage et un détendeur 7 sur le gaz provenant de l'évaporateur 5 (utilisé dans cette configuration uniquement en secours ou lors de consommation en pointe). Selon un objet de l'invention, il est prévu un procédé de fourniture io d'azote dans lequel : a) au moins pendant une première période de fonctionnement i) de l'azote gazeux est généré par un appareil de séparation d'air et envoyé au client après être passé dans un vaporiseur de secours ii) de l'azote liquide est envoyé d'un stockage vers l'appareil de 15 séparation d'air pour assurer au moins partiellement le maintien en froid de l'appareil et b) au moins pendant une deuxième période de fonctionnement, on envoie un débit d'azote liquide au vaporiseur de secours où il se 20 vaporise et on envoie l'azote liquide vaporisé au client. Selon d'autres aspects facultatifs : • on envoie un débit d'azote liquide au vaporiseur de secours (uniquement) si la quantité d'azote produite par l'appareil de séparation d'air est insuffisante ou nulle ; 25 • l'azote gazeux généré par l'appareil et l'azote liquide provenant du stockage sont mélangés pour forme un mélange avant d'être envoyés au vaporiseur de secours ; • l'azote liquide est détendu avant d'être mélangé avec l'azote gazeux ; 30 • le mélange envoyé au vaporiseur de secours est diphasique. Selon un autre aspect de l'invention, il est prévu un appareil de fourniture d'azote comprenant un stockage d'azote liquide, au moins une 3 2906878 boîte froide d'un appareil de séparation d'air, des moyens pour envoyer de l'azote liquide du stockage à l'appareil de séparation d'air, une conduite d'amenée d'air reliée à l'appareil de séparation d'air, une conduite de fourniture d'azote liquide connectée au stockage d'azote et une conduite de 5 fourniture d'azote gazeux connectée à l'appareil de séparation d'air, les conduites de fourniture d'azote liquide et d'azote gazeux étant reliées à une conduite collectrice. Optionnellement : • la conduite collectrice est adaptée à être connectée à un io vaporiseur de secours ; • un détendeur d'azote liquide est relié à la conduite d'azote liquide en amont de la conduite collectrice ; • l'appareil comprend une seule boite froide, incluant le stockage d'azote liquide, une colonne de séparation d'air et un échangeur d'air 15 d'alimentation ; • l'unique boite froide est isolée sous vide et perlitée. L'invention sera décrite en plus de détail en se référant à la Figure 3 qui illustre un appareil de fourniture d'azote selon l'invention. Le stockage 1 de la Figure 1 est remplacé par un ensemble complet 6 20 qui comprend un stockage d'azote liquide 1 et au moins la boite froide 9 du générateur cryogénique, sans toucher à la partie aval du système de vaporisation. Le générateur de gaz est constitué par une simple colonne de séparation d'air, à l'intérieur d'une boîte froide 9, produisant de l'azote 25 gazeux 11 en tête de colonne. La colonne est alimentée à partir d'un échangeur de chaleur 13 qui refroidit l'air 10 de préférence par échange de chaleur avec l'azote 11. Cet échange n'est pas illustré pour simplifier la figure. L'échangeur 13 peut alternativement se trouver en dehors de 30 l'ensemble 6. Une connexion d'azote liquide 8 vers la boîte froide 9 du générateur cryogénique assure au moins partiellement le maintien en froid du générateur par biberonnage.2 2906878 This requires: • to add a liquid nitrogen connection 8 to the cryogenic generator 9 (cold hold by biberonnage), which is quite easy to do because the storage 1 is generally equipped with at least two outlets ; 5 • to change the pipe to the customer downstream of the vaporization system by adding a stitching and a pressure reducer 7 on the gas coming from the evaporator 5 (used in this configuration only in emergency or during consumption peak). According to one object of the invention, there is provided a nitrogen supply process in which: a) at least during a first operating period i) nitrogen gas is generated by an air separation apparatus and sent to the customer after passing through an emergency vaporizer ii) liquid nitrogen is sent from storage to the air separation apparatus to at least partially maintain the apparatus in cold condition and at least during a second operating period, a flow of liquid nitrogen is sent to the emergency vaporizer where it vaporises and the vaporized liquid nitrogen is sent to the customer. According to other optional aspects: • a flow of liquid nitrogen is sent to the backup vaporizer (only) if the amount of nitrogen produced by the air separation apparatus is insufficient or zero; • the nitrogen gas generated by the apparatus and the liquid nitrogen from the storage are mixed to form a mixture before being sent to the backup vaporizer; • the liquid nitrogen is expanded before being mixed with the nitrogen gas; • the mixture sent to the emergency vaporizer is two-phase. According to another aspect of the invention, there is provided a nitrogen supply apparatus comprising a storage of liquid nitrogen, at least one cold box of an air separation apparatus, means for sending air liquid nitrogen from the storage at the air separation apparatus, an air supply line connected to the air separation apparatus, a liquid nitrogen supply line connected to the nitrogen storage and a nitrogen gas supply line connected to the air separation apparatus, the supply lines of liquid nitrogen and nitrogen gas being connected to a collecting pipe. Optionally: the collecting duct is adapted to be connected to an emergency vaporizer; • a liquid nitrogen expansion valve is connected to the liquid nitrogen line upstream of the collecting pipe; The apparatus comprises a single cold box, including the storage of liquid nitrogen, an air separation column and a supply air exchanger; • the single cold box is vacuum insulated and pearlised. The invention will be described in more detail with reference to Figure 3 which illustrates a nitrogen supply apparatus according to the invention. The storage 1 of FIG. 1 is replaced by a complete set 6 which comprises a storage of liquid nitrogen 1 and at least the cold box 9 of the cryogenic generator, without touching the downstream part of the vaporization system. The gas generator is constituted by a simple air separation column, inside a cold box 9, producing gaseous nitrogen 11 at the top of the column. The column is fed from a heat exchanger 13 which cools the air 10 preferably by heat exchange with the nitrogen 11. This exchange is not illustrated to simplify the figure. The exchanger 13 may alternatively be outside the assembly 6. A connection of liquid nitrogen 8 to the cold box 9 of the cryogenic generator at least partially ensures the cold maintenance of the generator by biberonnage.

4 2906878 Le stockage est également relié au vaporiseur de secours 5 par la conduite 3. Un détendeur 7 placé sur la conduite 3 de liquide assure le secours ou les pointes de consommation. La connexion gaz du générateur se fait en 5 amont du système de vaporisation 5. Il y a donc une unique tuyauterie 15 de connexion entre l'ensemble complet 6 et la partie qui va vers le système de vaporisation 5 et vers le client. • En fonctionnement normal, le gaz à température ambiante provenant du générateur de gaz 9 passe dans la conduite collectrice 10 et io ensuite à travers l'évaporateur 5, puis est envoyé dans le réseau client. • En fonctionnement avec générateur 9 en défaut, du liquide 3 est soutiré du stockage 1, est détendu dans le détendeur 7, envoyé à la conduite collectrice 15 puis vaporisé (et réchauffé à la température ambiante) dans le système de vaporisation 5. 15 • En cas de débit de pointe, un débit de liquide 3 provenant du stockage 1 est détendu, puis mélangé au flux de gaz 11 provenant du générateur 9 dans la conduite collectrice 15. Ensuite le mélange, éventuellement diphasique, est complètement vaporisé et réchauffé dans le système de vaporisation 5 avant d'être envoyé au client par la conduite 9.4 2906878 The storage is also connected to the backup vaporizer 5 through the pipe 3. A regulator 7 placed on the pipe 3 of liquid provides relief or peak consumption. The gas connection of the generator is upstream of the vaporization system 5. There is therefore a single connection pipe 15 between the complete assembly 6 and the part that goes to the vaporization system 5 and to the customer. In normal operation, the room temperature gas from the gas generator 9 passes into the collection line 10 and then through the evaporator 5, and is then sent to the customer network. • In operation with generator 9 in default, liquid 3 is withdrawn from storage 1, is expanded in the expander 7, sent to the collecting duct 15 and vaporized (and warmed to room temperature) in the vaporization system 5. 15 • In the case of a peak flow, a liquid flow 3 from the storage 1 is expanded and then mixed with the flow of gas 11 from the generator 9 into the collecting pipe 15. Then the mixture, possibly two-phase, is completely vaporized and heated in the spray system 5 before being sent to the customer by the pipe 9.

20 L'intérêt est que : • la connexion liquide n'est pas à faire sur site, car déjà intégrée au système ; • la fonction mélange générateur ù secours ou pointe est intégrée au système, sans nécessité de modifier la partie aval du système 25 de vaporisation. Alternativement dans la Figure 3, une boite froide unique 6 peut entourer un colonne de séparation d'air 9, un stockage d'azote liquide 1 et éventuellement d'autres équipements comme l'échangeur de refroidissement 13 d'air d'alimentation 10 et le vaporiseur-condenseur de tête de la colonne 30 9 (non-illustré). La boîte froide 6 peut est isolée sous vide et perlitée. 20 5The interest is that: • the liquid connection is not to be done on site because already integrated into the system; • The function generator or backup generator tip is integrated into the system, without the need to change the downstream part of the vaporization system. Alternatively in FIG. 3, a single cold box 6 can surround an air separation column 9, a storage of liquid nitrogen 1 and possibly other equipment such as the supply air cooling exchanger 13 and the top vaporizer-condenser of column 9 (not shown). The cold box 6 can be isolated under vacuum and pearlite. 20 5

Claims (10)

REVENDICATIONS 1. Procédé de fourniture d'azote dans lequel : a) au moins pendant une première période de fonctionnement s i) de l'azote gazeux est généré par un appareil de séparation d'air (9) et envoyé au client après être passé dans un vaporiseur de secours (5) ii) de l'azote liquide est envoyé d'un stockage (1) vers l'appareil de séparation d'air pour assurer au moins partiellement le maintien en froid 10 de l'appareil et b) au moins pendant une deuxième période de fonctionnement, on envoie un débit d'azote liquide au vaporiseur de secours où il se vaporise et on envoie l'azote liquide vaporisé au client. 15  A method of supplying nitrogen wherein: a) at least during a first operating period if) nitrogen gas is generated by an air separation apparatus (9) and sent to the customer after being passed through a emergency vaporizer (5) (ii) liquid nitrogen is sent from a storage (1) to the air separation apparatus to at least partially maintain the apparatus in cold condition and (b) at least during a second operating period, a flow of liquid nitrogen is sent to the emergency vaporizer where it vaporises and the vaporized liquid nitrogen is sent to the customer. 15 2. Procédé selon la revendication 1 dans lequel on envoie un débit d'azote liquide au vaporiseur de secours (5) (uniquement) si la quantité d'azote produite par l'appareil de séparation d'air (9) est insuffisante ou nulle.  2. The method of claim 1 wherein a flow of liquid nitrogen is sent to the backup vaporizer (5) (only) if the amount of nitrogen produced by the air separation apparatus (9) is insufficient or zero . 3. Procédé selon la revendication 1 ou 2 dans lequel l'azote gazeux généré par l'appareil (9) et l'azote liquide provenant du stockage (1) sont mélangés pour forme un mélange avant d'être envoyés au vaporiseur de secours (5). 25  The process of claim 1 or 2 wherein the nitrogen gas generated by the apparatus (9) and the liquid nitrogen from the storage (1) are mixed to form a mixture prior to being sent to the backup vaporizer ( 5). 25 4. Procédé selon la revendication 3 dans lequel l'azote liquide (3) est détendu avant d'être mélangé avec l'azote gazeux (11).  4. The method of claim 3 wherein the liquid nitrogen (3) is expanded before being mixed with the nitrogen gas (11). 5. Procédé selon l'une des revendications 3 et 4 dans lequel le mélange 30 envoyé au vaporiseur de secours est diphasique.  5. Method according to one of claims 3 and 4 wherein the mixture 30 sent to the backup vaporizer is two-phase. 6. Appareil de fourniture d'azote comprenant un stockage d'azote liquide (1), au moins une boîte froide (6,9), d'un appareil de séparation d'air des 15 6 2906878 moyens pour` envoyer de l'azote liquide du stockage à l'appareil de séparation d'air, une conduite d'amenée d'air (10) reliée à l'appareil de séparation d'air, une conduite de fourniture d'azote liquide (3) connectée au stockage d'azote et une conduite de fourniture d'azote gazeux (Il) connectée à l'appareil de séparation d'air, les conduites de fourniture d'azote liquide et d'azote gazeux étant reliées à une conduite collectrice (15).  A nitrogen supply apparatus comprising a liquid nitrogen storage (1), at least one cold box (6, 9), an air separation apparatus, means for sending liquid nitrogen from the storage at the air separation apparatus, an air supply line (10) connected to the air separation apparatus, a liquid nitrogen supply line (3) connected to the storage nitrogen and a supply line of nitrogen gas (II) connected to the air separation apparatus, the supply lines of liquid nitrogen and nitrogen gas being connected to a collecting pipe (15). 7. Appareil selon la revendication 6 dans lequel la conduite collectrice lo (15) est adaptée à être connectée à un vaporiseur de secours (5).  7. Apparatus according to claim 6 wherein the lo-collector (15) is adapted to be connected to a backup vaporizer (5). 8. Appareil selon la revendication 6 ou 7 comprenant un détendeur d'azote liquide (7) relié à la conduite d'azote liquide (3) en amont de la conduite collectrice (15).  8. Apparatus according to claim 6 or 7 comprising a liquid nitrogen expander (7) connected to the liquid nitrogen line (3) upstream of the manifold (15). 9. Appareil selon la revendication 6 ou 7 ou 8 comprenant une seule boite froide (6), incluant le stockage d'azote liquide (1), une colonne de séparation d'air (9) et éventuellement un échangeur d'air d'alimentation (13). 20  9. Apparatus according to claim 6 or 7 or 8 comprising a single cold box (6), including the storage of liquid nitrogen (1), an air separation column (9) and optionally an air exchanger. power supply (13). 20 10. Appareil selon la revendication 9 où l'unique boite froide (6) est isolée sous vide et perlitée  10. Apparatus according to claim 9 wherein the single cold box (6) is vacuum-insulated and pearled
FR0752579A 2007-01-09 2007-01-09 Nitrogen supplying method, involves sending liquid nitrogen towards separating apparatus for partially maintaining cooling of apparatus, during operating period, and conveying liquid nitrogen flow to vaporizer during another period Pending FR2906878A1 (en)

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FR3061534A1 (en) * 2017-01-05 2018-07-06 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude METHOD AND APPARATUS FOR HEATING AN ATMOSPHERIC VAPORIZER USING A GAS FROM A CRYOGENIC AIR SEPARATION UNIT
CN112833335A (en) * 2021-02-03 2021-05-25 国家管网集团川气东送天然气管道有限公司 Natural gas line liquid nitrogen gasification system

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US4671813A (en) * 1984-03-29 1987-06-09 Daidousanso Co. Ltd. Highly pure nitrogen gas producing apparatus
US5157927A (en) * 1990-04-10 1992-10-27 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and apparatus for the production of gaseous nitrogen and system for supplying corresponding nitrogen
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US4671813A (en) * 1984-03-29 1987-06-09 Daidousanso Co. Ltd. Highly pure nitrogen gas producing apparatus
US5157927A (en) * 1990-04-10 1992-10-27 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process and apparatus for the production of gaseous nitrogen and system for supplying corresponding nitrogen
EP0538857A1 (en) * 1991-10-25 1993-04-28 Linde Aktiengesellschaft Installation for the low temperature separation
JPH09217982A (en) * 1996-02-09 1997-08-19 Nippon Sanso Kk Method for liquefying and separating air and apparatus therefor
FR2855598A1 (en) * 2003-05-28 2004-12-03 Air Liquide METHOD AND INSTALLATION FOR BACKUP SUPPLY OF A GAS UNDER PRESSURE BY VAPORIZATION OF CRYOGENIC LIQUID

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3061534A1 (en) * 2017-01-05 2018-07-06 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude METHOD AND APPARATUS FOR HEATING AN ATMOSPHERIC VAPORIZER USING A GAS FROM A CRYOGENIC AIR SEPARATION UNIT
US10605410B2 (en) 2017-01-05 2020-03-31 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method for reheating an atmospheric vaporizer using a gas originating from a cryogenic air-separation unit
US11092292B2 (en) 2017-01-05 2021-08-17 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method for reheating an atmospheric vaporizer using a gas originating from a cryogenic air separation unit
CN112833335A (en) * 2021-02-03 2021-05-25 国家管网集团川气东送天然气管道有限公司 Natural gas line liquid nitrogen gasification system

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