EP2191220A2 - Main exchange line and cryogenic distillation air separation unit incorporating such an exchange line - Google Patents

Main exchange line and cryogenic distillation air separation unit incorporating such an exchange line

Info

Publication number
EP2191220A2
EP2191220A2 EP08835215A EP08835215A EP2191220A2 EP 2191220 A2 EP2191220 A2 EP 2191220A2 EP 08835215 A EP08835215 A EP 08835215A EP 08835215 A EP08835215 A EP 08835215A EP 2191220 A2 EP2191220 A2 EP 2191220A2
Authority
EP
European Patent Office
Prior art keywords
exchange
assembly
flow
bodies
assemblies
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.)
Withdrawn
Application number
EP08835215A
Other languages
German (de)
French (fr)
Inventor
Benoît 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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP2191220A2 publication Critical patent/EP2191220A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0037—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other
    • 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
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04193—Division of the main heat exchange line in consecutive sections having different functions
    • 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
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04218—Parallel arrangement of the main heat exchange line in cores having different functions, e.g. in low pressure and high pressure cores
    • 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
    • F25J3/04763—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
    • F25J3/04872—Vertical layout of cold equipments within in the cold box, e.g. columns, heat exchangers etc.
    • 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
    • F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
    • F25J5/002—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants for continuously recuperating cold, i.e. in a so-called recuperative heat exchanger
    • 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/72—Refluxing the column with at least a part of the totally condensed overhead gas
    • 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
    • F25J2290/40—Vertical layout or arrangement of cold equipments within in the cold box, e.g. columns, condensers, heat exchangers etc.
    • 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
    • F25J2290/42—Modularity, pre-fabrication of modules, assembling and erection, horizontal layout, i.e. plot plan, and vertical arrangement of parts of the cryogenic unit, e.g. of the cold box
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0033—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for cryogenic applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2230/00—Sealing means

Definitions

  • Main exchange line and apparatus for separating air by cryogenic distillation incorporating such a line of exchange.
  • the present invention relates to an apparatus for separating air by cryogenic distillation.
  • the main exchange line consists of a set of standardized welded stainless steel plate heat exchangers, which can be installed in a cold box containing vacuum or conventional perlite.
  • Each plate heat exchanger exchances heat between two or more fluids.
  • Exchanges of this type for example, provided by companies
  • Tranter Inc., Swep or Alfa Laval allow the exchange of heat between two fluids, a hot fluid and a cold fluid.
  • a vaporized rich air / liquid exchange The distribution of the air flow towards the two exchanges can be done using balancing valves, or naturally if the losses of air circuit charges in the two exchanges are balanced.
  • the length of these exchangers is quite limited (generally less than 1 m), which is small enough to make the thermal gradient of about 200 0 C between the hot end and the cold end of the exchange, under a small difference in temperature ( ⁇ T logarithmic mean between 2 and 10 0 C).
  • an exchange line adapted to be incorporated in an air separation apparatus, comprising at least two exchange assemblies, the assemblies being connected in parallel, each assembly comprising at least two exchange bodies, preferably at least three exchange bodies, connected in series with each other, means for sending a first flow rate to be cooled at the first assembly, so that the first flow rate cools in each body of exchange of the first assembly, means for sending a second flow to cool to the second assembly, so that the second flow cools in each exchange body of the second assembly, means for sending a first fluid to be heated to a second first exchange assemblies, so that the first fluid is heated in each exchange body of the first assembly and means for sending a second fluid to warm to a second of exchange assemblies, so that the first fluid is heated in each exchange body of the second assembly characterized in that no means allows a part of the first flow to cool in the second assembly, no means allows a portion of
  • the exchange line comprises means for separating a flow rate to be cooled downstream of the two assemblies to form the first and second flow rates, so that the first and second flow rates to be cooled pass in series through each exchange body. their respective assembly. - only two exchange meetings.
  • the bodies of an assembly may be aligned in the direction of their length, arranged with their length parallel to that of adjacent bodies, arranged with their length parallel to that of the adjacent bodies and staggered.
  • Each exchange body may be a stack of rectangular plates (possibly with rounded corners) or a stack of irregular hexagonal plates, connecting elements being placed on either side of each body to connect it to the adjacent body.
  • At least one of the exchange bodies is a standardized exchanger, preferably in which at least two of the exchange bodies are of the same model.
  • an air separation apparatus comprising a distillation column having an overhead condenser, an exchange line as claimed in one of claims 1 to 9, means to send compressed and purified air to each of the exchange assemblies, means for withdrawing nitrogen gas from the column, means for sending the nitrogen gas to a first exchange assembly, means for sending liquid of column from the column to the condenser, means for taking vaporized liquid from the condenser and means for sending the vaporized liquid to the second assembly.
  • the apparatus may include means for controlling the amount of air sent to the exchange assemblies.
  • At least two exchange bodies of the same assembly are placed one above the other, preferably all one above the other.
  • a method for cooling air in an exchange line comprising at least two exchange assemblies, the assemblies being connected in parallel, each assembly comprising at least two bodies of exchange, preferably at least three exchange bodies, connected in series with each other, means for sending a first air flow to be cooled to the first assembly, so that the first flow rate cools in each exchange body the first assembly, means for sending a second air flow to be cooled to the second assembly, so that the second flow is cooled in each exchange body of the second assembly, means for sending a first fluid to be heated at a first of the exchange assemblies, so that the first fluid is heated in each exchange body of the first assembly and means for sending a second fluid to heated ffer to a second of the exchange assemblies, so that the first fluid is heated in each exchange body of the second assembly characterized in that all the first flow is sent only to the first assembly, the whole second flow is sent only at the second assembly, all the first fluid is sent only to the first assembly and all the second fluid is sent only to the second assembly.
  • the first and second flow rates enter their respective assemblies at different pressures and / or temperatures.
  • first and second flow rates are mixed downstream of the first and second assemblies.
  • FIG. 1 represents an exchange line according to the invention
  • FIGS. 1 represents an exchange line according to the invention
  • FIG 5 represent an exchange assembly adapted to be part of a line of exchange according to the invention and Figure 6 shows an air separation apparatus according to the invention.
  • a heat exchange line consists of two exchange assemblies, each comprising three exchange bodies.
  • the six exchange bodies can be identical and are standardized exchangers of the same model from a single manufacturer.
  • Each exchange body carries out a heat exchange between only two fluids.
  • the exchange bodies 13A to 13C are placed one above the other, the 13C being the lowest and the 13A being the highest.
  • the exchange bodies 11A to 11C are placed one above the other, the 11C being the lowest and the 11A being the highest.
  • Air to be cooled 1 is divided in two by means of two valves 7, 9 to form two flow rates 3, 5.
  • the flow 3 is sent to the first assembly formed by the exchange bodies 11 A, 11 B , 11C connected in series and is not sent to the second assembly.
  • the flow 5 is sent to the second assembly constituted by the exchange bodies 13A, 13B, 13C connected in series and is not sent to the first assembly.
  • the air flow is not mixed except possibly downstream of the last bodies 11 C, 13C.
  • the first and second flow rates enter their respective assemblies at different pressures and / or temperatures, having, for example, been compressed at different pressures.
  • a flow of vaporized rich liquid 17 from the condenser of a single column is fed to the bodies 11C, 11B, 11A in order to be heated to room temperature.
  • a nitrogen flow 19 from the same column is sent to the bodies 13C, 13B, 13A.
  • One or both assemblies may be replaced by assemblies as shown in Figures 2 to 5.
  • the inlet of the exchange body is located along the length of the body.
  • the bodies with their staggered lengths as illustrated in Figure 2, connected by pipes 31 perpendicular to the length axis of the body.
  • the body 13A is above the body 13C
  • the body 13B is above the body 13D.
  • the lengths are parallel to each other, possibly with insulating shims 25, perpendicular to the axis of length of the body, placed between the bodies 13.
  • the bodies 13 are connected by pipes 31 perpendicular to the length axis of the bodies.
  • the bodies are placed, in use, one above the other, the 13A being the highest and the 13 E the lowest.
  • the bottom body 13 E is leaning because there is a risk of having drops of liquid air output.
  • FIG 4 the bodies 11 are arranged as in Figure 1.
  • Figure 5 shows a particular arrangement suitable for bodies having an irregular hexagonal section, such as MAXCHANGER ®.
  • the bodies 11A, 11B, 11C are arranged one above the other with connecting elements 21 which fill the voids on either side of the bodies to form a generally rectangular section element capped with four inlets / outlets 23.
  • This monolithic element is particularly easy to install and support. Even if one has the impression of complicating the arrangement with this type of exchangers, it allows the use of standard exchangers inexpensive and with extremely short manufacturing times: the cryogenic exchangers are then no longer on the critical path of realization of the air separation apparatus.
  • Figure 6 shows an air separation apparatus for producing nitrogen comprising an exchange line according to the invention.

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)

Abstract

An exchange line, designed to be incorporated into an air separation unit, comprises at least two exchange assemblies, the 2 assemblies being connected in parallel, each assembly comprising at least two exchange bodies (11A, 11B, 11C, 13A, 13B, 13C), preferably at least three exchange bodies, connected together in series.

Description

Ligne d'échange principale et appareil de séparation d'air par distillation cryogénique incorporant une telle ligne d'échange. Main exchange line and apparatus for separating air by cryogenic distillation incorporating such a line of exchange.
La présente invention est relative à un appareil de séparation d'air par distillation cryogénique.The present invention relates to an apparatus for separating air by cryogenic distillation.
Il est classique d'utiliser des échangeurs à plaques brasées en aluminium pour des échangeurs cryogéniques.It is conventional to use brazed aluminum plate heat exchangers for cryogenic exchangers.
Pour les appareils de petites tailles, les coûts de fabrication sont élevés. Cette technologie est surtout adaptée pour du « sur mesure », « surmesure » non justifié sur des appareils de petites tailles, où c'est le coût qui prime sur la performance de l'appareil. De même, le « sur-mesure » se traduit en général par des délais de fabrication très longs.For smaller devices, manufacturing costs are high. This technology is especially suitable for "tailor-made", "over-measurement" not justified on small devices, where it is the cost that overrides the performance of the device. Similarly, the "custom-made" is generally translated by very long manufacturing lead times.
Ces échangeurs ont néanmoins l'avantage de permettre l'échange de chaleur entre plusieurs fluides.These exchangers nevertheless have the advantage of allowing the exchange of heat between several fluids.
Selon l'invention, la ligne d'échange principale est constituée d'un ensemble d'échangeurs à plaques en acier inoxydable soudées standardisé, qui peuvent être installés dans une boite froide contenant de la perlite sous vide ou conventionnelle.According to the invention, the main exchange line consists of a set of standardized welded stainless steel plate heat exchangers, which can be installed in a cold box containing vacuum or conventional perlite.
Chaque échangeur à plaque effectue un échange de chaleur entre au plus deux fluides. Les échangeurs de ce type (par exemple, fournis par les sociétésEach plate heat exchanger exchances heat between two or more fluids. Exchanges of this type (for example, provided by companies
Tranter Inc., Swep ou Alfa Laval) permettent l'échange de chaleur entre deux fluides, soit un fluide chaud et un fluide froid.Tranter Inc., Swep or Alfa Laval) allow the exchange of heat between two fluids, a hot fluid and a cold fluid.
Sur un générateur cryogénique d'azote, on a en général trois fluides :On a cryogenic nitrogen generator, there are generally three fluids:
• un fluide chaud : air • deux fluides froids : azote et liquide riche vaporisé• a hot fluid: air • two cold fluids: nitrogen and vaporized rich liquid
Pour utiliser ces échangeurs, on va couper le flux d'air en deux (idéalement au prorata des débits de fluides froids ou encore de la charge thermique de chacun des fluides) de façon à faire l'échange global thermique dans deux échanges parallèles :To use these exchangers, we will cut the flow of air in two (ideally in proportion to the flow of cold fluids or the load thermal of each of the fluids) so as to make the global heat exchange in two parallel exchanges:
• un échange Air / Azote• Air / nitrogen exchange
• un échange Air / Liquide riche vaporisé La répartition du débit d'air vers les deux échanges peut se faire à l'aide de vannes d'équilibrage, ou naturellement si les pertes de charges du circuit air dans les deux échanges sont équilibrées.• A vaporized rich air / liquid exchange The distribution of the air flow towards the two exchanges can be done using balancing valves, or naturally if the losses of air circuit charges in the two exchanges are balanced.
Ce découpage en deux du flux d'air n'a pas d'incidence sur les performances globales de l'échange, car le diagramme d'échange initial est quasiment parallèle, avec aucune sortie intermédiaire. Avec la bonne répartition du flux d'air, on peut faire deux échanges en parallèle qui ont chacun un diagramme d'échange parallèle.This split in two of the airflow does not affect the overall performance of the exchange, because the initial exchange diagram is almost parallel, with no intermediate output. With the good distribution of the air flow, one can make two exchanges in parallel which each have a parallel exchange diagram.
Par ailleurs, la longueur de ces échangeurs est assez limitée (en général, inférieure à 1 m), ce qui est assez faible pour faire le gradient thermique d'environ 2000C entre le bout chaud et le bout froid de l'échange, sous un faible écart de température (ΔT moyen logarithmique entre 2 et 100C).Moreover, the length of these exchangers is quite limited (generally less than 1 m), which is small enough to make the thermal gradient of about 200 0 C between the hot end and the cold end of the exchange, under a small difference in temperature (ΔT logarithmic mean between 2 and 10 0 C).
Cela nécessite l'usage d'échangeurs multi-passes et/ou l'usage de plusieurs échangeurs en série pour assurer l'échange thermique. Selon un objet de l'invention, il est prévu une ligne d'échange, adaptée à être incorporée dans un appareil de séparation d'air, comprenant au moins deux assemblées d'échange , les assemblées étant connectés en parallèle, chaque assemblée comprenant au moins deux corps d'échange, de préférence au moins trois corps d'échange, connectés en série entre eux, des moyens pour envoyer un premier débit à refroidir à la première assemblée, de sorte que le premier débit se refroidit dans chaque corps d'échange de la première assemblée , des moyens pour envoyer un deuxième débit à refroidir à la deuxième assemblée, de sorte que le deuxième débit se refroidit dans chaque corps d'échange de la deuxième assemblée, des moyens pour envoyer un premier fluide à réchauffer à une première des assemblées d'échange , de sorte que le premier fluide se réchauffe dans chaque corps d'échange de la première assemblée et des moyens pour envoyer un deuxième fluide à réchauffer à une deuxième des assemblées d'échange , de sorte que le premier fluide se réchauffe dans chaque corps d'échange de la deuxième assemblée caractérisé en ce qu'aucun moyen ne permet à une partie du premier débit de se refroidir dans la deuxième assemblée, qu'aucun moyen ne permet à une partie du deuxième débit de se refroidir dans la première assemblée, qu'aucun moyen ne permet à une partie du premier fluide de se réchauffer dans la deuxième assemblée et qu'aucun moyen ne permet à une partie du deuxième fluide de se réchauffer dans la première assemblée.This requires the use of multi-pass exchangers and / or the use of several exchangers in series to ensure heat exchange. According to an object of the invention, there is provided an exchange line, adapted to be incorporated in an air separation apparatus, comprising at least two exchange assemblies, the assemblies being connected in parallel, each assembly comprising at least two exchange bodies, preferably at least three exchange bodies, connected in series with each other, means for sending a first flow rate to be cooled at the first assembly, so that the first flow rate cools in each body of exchange of the first assembly, means for sending a second flow to cool to the second assembly, so that the second flow cools in each exchange body of the second assembly, means for sending a first fluid to be heated to a second first exchange assemblies, so that the first fluid is heated in each exchange body of the first assembly and means for sending a second fluid to warm to a second of exchange assemblies, so that the first fluid is heated in each exchange body of the second assembly characterized in that no means allows a part of the first flow to cool in the second assembly, no means allows a portion of the second flow to cool in the first assembly, that no means allows a portion of the first fluid to heat up in the second assembly and that no means allows a portion of the second fluid to warm up in the first assembly.
De préférence , la ligne d'échange comprend - des moyens pour séparer un débit à refroidir en aval des deux assemblées pour former le premier et deuxième débits, de sorte que les premier et deuxième débits à refroidir traversent en série chaque corps d'échange de leur assemblée respective. - seulement deux assemblées d'échange.Preferably, the exchange line comprises means for separating a flow rate to be cooled downstream of the two assemblies to form the first and second flow rates, so that the first and second flow rates to be cooled pass in series through each exchange body. their respective assembly. - only two exchange meetings.
Les corps d'une assemblée peuvent être alignés dans le sens de leur longueur, disposés avec leur longueur parallèle à celle des corps adjacents, disposés avec leur longueur parallèle à celle des corps adjacents et en quinconce. Chaque corps d'échange peut être un empilage de plaques rectangulaires (avec éventuellement les coins arrondis) ou un empilage de plaques hexagonales irrégulières, des éléments de liaison étant placés de part et d'autre de chaque corps pour le relier au corps adjacent.The bodies of an assembly may be aligned in the direction of their length, arranged with their length parallel to that of adjacent bodies, arranged with their length parallel to that of the adjacent bodies and staggered. Each exchange body may be a stack of rectangular plates (possibly with rounded corners) or a stack of irregular hexagonal plates, connecting elements being placed on either side of each body to connect it to the adjacent body.
Au moins un des corps d'échange est un échangeur standardisé, de préférence dans lequel au moins deux des corps d'échange sont du même modèle.At least one of the exchange bodies is a standardized exchanger, preferably in which at least two of the exchange bodies are of the same model.
Selon un autre objet de l'invention, il est prévu un appareil de séparation d'air comprenant une colonne de distillation ayant un condenseur de tête, une ligne d'échange telle que revendiquée dans l'une des revendications 1 à 9, des moyens pour envoyer de l'air comprimé et épuré à chacune des assemblées d'échange, des moyens pour soutirer de l'azote gazeux de la colonne, des moyens pour envoyer l'azote gazeux à une première assemblée d'échange, des moyens pour envoyer du liquide de cuve de la colonne au condenseur, des moyens pour prélever du liquide vaporisé du condenseur et des moyens pour envoyer le liquide vaporisé à la deuxième assemblée.According to another object of the invention, there is provided an air separation apparatus comprising a distillation column having an overhead condenser, an exchange line as claimed in one of claims 1 to 9, means to send compressed and purified air to each of the exchange assemblies, means for withdrawing nitrogen gas from the column, means for sending the nitrogen gas to a first exchange assembly, means for sending liquid of column from the column to the condenser, means for taking vaporized liquid from the condenser and means for sending the vaporized liquid to the second assembly.
L'appareil peut comprendre des moyens pour régler la quantité d'air envoyé aux assemblées d'échange.The apparatus may include means for controlling the amount of air sent to the exchange assemblies.
Au moins deux corps d'échange d'une même assemblée sont placés les uns au dessus des autres, de préférence sont tous les uns au dessus des autres.At least two exchange bodies of the same assembly are placed one above the other, preferably all one above the other.
Selon un autre objet de l'invention, il est prévu un procédé de refroidissement d'air dans une ligne d'échange, comprenant au moins deux assemblées d'échange, les assemblées étant connectés en parallèle, chaque assemblée comprenant au moins deux corps d'échange, de préférence au moins trois corps d'échange, connectés en série entre eux, des moyens pour envoyer un premier débit d'air à refroidir à la première assemblée, de sorte que le premier débit se refroidit dans chaque corps d'échange de la première assemblée, des moyens pour envoyer un deuxième débit d'air à refroidir à la deuxième assemblée, de sorte que le deuxième débit se refroidit dans chaque corps d'échange de la deuxième assemblée, des moyens pour envoyer un premier fluide à réchauffer à une première des assemblées d'échange, de sorte que le premier fluide se réchauffe dans chaque corps d'échange de la première assemblée et des moyens pour envoyer un deuxième fluide à réchauffer à une deuxième des assemblées d'échange, de sorte que le premier fluide se réchauffe dans chaque corps d'échange de la deuxième assemblée caractérisé en ce que tout le premier débit est envoyé uniquement à la première assemblée, tout le deuxième débit est envoyé uniquement à la deuxième assemblée, tout le premier fluide est envoyé uniquement dans la première assemblée et tout le deuxième fluide est envoyé uniquement à la deuxième assemblée.According to another object of the invention, there is provided a method for cooling air in an exchange line, comprising at least two exchange assemblies, the assemblies being connected in parallel, each assembly comprising at least two bodies of exchange, preferably at least three exchange bodies, connected in series with each other, means for sending a first air flow to be cooled to the first assembly, so that the first flow rate cools in each exchange body the first assembly, means for sending a second air flow to be cooled to the second assembly, so that the second flow is cooled in each exchange body of the second assembly, means for sending a first fluid to be heated at a first of the exchange assemblies, so that the first fluid is heated in each exchange body of the first assembly and means for sending a second fluid to heated ffer to a second of the exchange assemblies, so that the first fluid is heated in each exchange body of the second assembly characterized in that all the first flow is sent only to the first assembly, the whole second flow is sent only at the second assembly, all the first fluid is sent only to the first assembly and all the second fluid is sent only to the second assembly.
Eventuellement les premier et deuxième débits rentrent dans leurs assemblées respectives à des pressions et/ou à des températures différentes.Optionally, the first and second flow rates enter their respective assemblies at different pressures and / or temperatures.
Eventuellement les premier et deuxième débits sont mélangés en aval des première et deuxième assemblées. L'invention sera décrite en plus de détail en se référant aux figures.Optionally the first and second flow rates are mixed downstream of the first and second assemblies. The invention will be described in more detail with reference to the figures.
La Figure 1 représente une ligne d'échange selon l'invention, les Figures 2 àFIG. 1 represents an exchange line according to the invention, FIGS.
5 représentent une assemblée d'échange adaptée à faire partie d'une ligne d'échange selon l'invention et la Figure 6 représente un appareil de séparation d'air selon l'invention.5 represent an exchange assembly adapted to be part of a line of exchange according to the invention and Figure 6 shows an air separation apparatus according to the invention.
Dans la Figure 1 , une ligne d'échange thermique selon l'invention est constituée par deux assemblées d'échange, chacun comprenant trois corps d'échange. De préférence, les six corps d'échange peuvent être identiques et sont des échangeurs standardisés du même modèle d'un seul fabricant. Chaque corps d'échange effectue un échange de chaleur entre seulement deux fluides. En usage, les corps d'échange 13A à 13C sont placés les uns au dessus des autres, le 13C étant le plus bas et le 13A étant le plus haut. De même, en usage, les corps d'échange 11A à 11C sont placés les uns au dessus des autres, le 11C étant le plus bas et le 11A étant le plus haut.In FIG. 1, a heat exchange line according to the invention consists of two exchange assemblies, each comprising three exchange bodies. Preferably, the six exchange bodies can be identical and are standardized exchangers of the same model from a single manufacturer. Each exchange body carries out a heat exchange between only two fluids. In use, the exchange bodies 13A to 13C are placed one above the other, the 13C being the lowest and the 13A being the highest. Likewise, in use, the exchange bodies 11A to 11C are placed one above the other, the 11C being the lowest and the 11A being the highest.
De l'air à refroidir 1 est divisé en deux à l'aide de deux vannes 7, 9 pour former deux débits 3, 5. Le débit 3 est envoyé à la première assemblée constituée par les corps d'échange 11 A, 11 B, 11C connectés en série et n'est pas envoyé à la deuxième assemblée. Le débit 5 est envoyé à la deuxième assemblée constituée par les corps d'échange 13A, 13B, 13C connectés en série et n'est pas envoyé à la première assemblée. Les débit d'air ne sont pas mélangés sauf éventuellement en aval des derniers corps 11 C,13C. Les premier et deuxième débits rentrent dans leurs assemblées respectives à des pressions et/ou à des températures différentes, ayant été, par exemple, comprimé à des pressions différentes.Air to be cooled 1 is divided in two by means of two valves 7, 9 to form two flow rates 3, 5. The flow 3 is sent to the first assembly formed by the exchange bodies 11 A, 11 B , 11C connected in series and is not sent to the second assembly. The flow 5 is sent to the second assembly constituted by the exchange bodies 13A, 13B, 13C connected in series and is not sent to the first assembly. The air flow is not mixed except possibly downstream of the last bodies 11 C, 13C. The first and second flow rates enter their respective assemblies at different pressures and / or temperatures, having, for example, been compressed at different pressures.
Un débit de liquide riche vaporisé 17 provenant du condenseur d'une simple colonne est envoyé aux corps 11 C, 11 B, 11A dans l'ordre pour être chauffé à la température ambiante. Un débit d'azote 19 provenant de la même colonne est envoyé aux corps 13C, 13B, 13A. Une des assemblées ou les deux assemblées peuvent être remplacées par une assemblées telle qu'illustrées dans les Figures 2 à 5.A flow of vaporized rich liquid 17 from the condenser of a single column is fed to the bodies 11C, 11B, 11A in order to be heated to room temperature. A nitrogen flow 19 from the same column is sent to the bodies 13C, 13B, 13A. One or both assemblies may be replaced by assemblies as shown in Figures 2 to 5.
Dans les Figures 2 et 3, l'entrée du corps d'échange est située sur la longueur du corps. On peut donc envisager de disposer les corps avec leurs longueurs en quinconce telle qu'illustrée dans la Figure 2, reliés par des tubulures 31 perpendiculaires à l'axe de longueur des corps. En usage, le corps 13A est au dessus du corps 13C, et le corps 13B est au dessus du corps 13D. Sinon, comme dans la Figure 3, les longueurs sont parallèles les unes aux autres, éventuellement avec des cales isolante 25, perpendiculaires à l'axe de longueur des corps, posée entre les corps 13. Les corps 13 sont reliés par des tubulures 31 perpendiculaires à l'axe de longueur des corps. Les corps sont placés, en usage, les uns au dessus des autres, le 13A étant le plus élevé et le 13 E le plus bas. Le corps du bas 13 E est penché car il y a un risque d'avoir des gouttes d'air liquide en sortie.In Figures 2 and 3, the inlet of the exchange body is located along the length of the body. We can therefore consider arranging the bodies with their staggered lengths as illustrated in Figure 2, connected by pipes 31 perpendicular to the length axis of the body. In use, the body 13A is above the body 13C, and the body 13B is above the body 13D. Otherwise, as in Figure 3, the lengths are parallel to each other, possibly with insulating shims 25, perpendicular to the axis of length of the body, placed between the bodies 13. The bodies 13 are connected by pipes 31 perpendicular to the length axis of the bodies. The bodies are placed, in use, one above the other, the 13A being the highest and the 13 E the lowest. The bottom body 13 E is leaning because there is a risk of having drops of liquid air output.
Dans la Figure 4 les corps 11 sont disposés comme dans la Figure 1. La Figure 5 montre une disposition particulière adaptée aux corps ayant une section hexagonale irrégulière, telle que les MAXCHANGER ®. Les corps 11 A, 11 B, 11C sont disposés les uns au-dessus des autres avec des éléments de liaison 21 qui comblent les vides de part et d'autre des corps pour former un élément de section globalement rectangulaire coiffé de quatre entrée/sorties de fluides 23. Cet élément monolithique est particulièrement facile à installer et à supporter. Même si on a l'impression de compliquer l'arrangement avec ce type d'échangeurs, cela permet d'utiliser des échangeurs standards peu chers et avec des délais de fabrication extrêmement courts : les échangeurs cryogéniques ne sont alors plus sur le chemin critique de réalisation de l'appareil de séparation d'air. La Figure 6 montre un appareil de séparation d'air pour produire de l'azote comprenant une ligne d'échange selon l'invention. La ligne illustrée est celle des Figures 1 et 4 mais évidemment celles des Figures 2,3 et 5 auraient pu être incorporées de la même manière. L'air 3,5 provenant des deux groupes d'échangeurs est envoyé à la colonne 33. De l'azote 19 est soutiré en tête de colonne et envoyé au groupe13 et du liquide riche vaporisé 17 provenant du condenseur de tête 35 est envoyé au deuxième groupe 11. In Figure 4 the bodies 11 are arranged as in Figure 1. Figure 5 shows a particular arrangement suitable for bodies having an irregular hexagonal section, such as MAXCHANGER ®. The bodies 11A, 11B, 11C are arranged one above the other with connecting elements 21 which fill the voids on either side of the bodies to form a generally rectangular section element capped with four inlets / outlets 23. This monolithic element is particularly easy to install and support. Even if one has the impression of complicating the arrangement with this type of exchangers, it allows the use of standard exchangers inexpensive and with extremely short manufacturing times: the cryogenic exchangers are then no longer on the critical path of realization of the air separation apparatus. Figure 6 shows an air separation apparatus for producing nitrogen comprising an exchange line according to the invention. The line illustrated is that of Figures 1 and 4 but obviously those of Figures 2,3 and 5 could have been incorporated in the same way. The air 3.5 from the two groups of exchangers is sent to the column 33. Nitrogen 19 is withdrawn at the top of the column and sent to the group 13 and the vaporized rich liquid 17 from the overhead condenser 35 is sent to second group 11.

Claims

REVENDICATIONS
1. Ligne d'échange, adaptée à être incorporée dans un appareil de séparation d'air, comprenant au moins deux assemblées d'échange (11 , 13), constituées par une première et deuxième assemblées, les assemblées étant connectés en parallèle, chaque assemblée comprenant au moins deux corps d'échange (11 A, 11 B, 11 C, 11 D, 13A, 13B, 13C), de préférence au moins trois corps d'échange, connectés en série entre eux, des moyens pour envoyer un premier débit à refroidir à la première assemblée, de sorte que le premier débit se refroidit dans chaque corps d'échange de la première assemblée, des moyens pour envoyer un deuxième débit à refroidir à la deuxième assemblée, de sorte que le deuxième débit se refroidit dans chaque corps d'échange de la deuxième assemblée, des moyens pour envoyer un premier fluide à réchauffer (17) à la première assemblée , de sorte que le premier fluide se réchauffe dans chaque corps d'échange (11 A, 11 B, 11 C, 11 D) de la première assemblée et des moyens pour envoyer un deuxième fluide (19) à réchauffer à une deuxième assemblée (13), de sorte que le deuxième fluide se réchauffe dans chaque corps d'échange de la deuxième assemblée (13A, 13B, 13C) caractérisé en ce qu'aucun moyen ne permet à une partie du premier débit de se refroidir dans la deuxième assemblée, qu'aucun moyen ne permet à une partie du deuxième débit de se refroidir dans la première assemblée, qu'aucun moyen ne permet à une partie du premier fluide de se réchauffer dans la deuxième assemblée et qu'aucun moyen ne permet à une partie du deuxième fluide de se réchauffer dans la première assemblée.1. Exchange line, adapted to be incorporated in an air separation apparatus, comprising at least two exchange assemblies (11, 13), constituted by a first and second assembly, the assemblies being connected in parallel, each assembly comprising at least two exchange bodies (11A, 11B, 11C, 11D, 13A, 13B, 13C), preferably at least three exchange bodies, connected in series with each other, means for sending a first flow to be cooled at the first assembly, so that the first flow is cooled in each exchange body of the first assembly, means for sending a second flow to be cooled to the second assembly, so that the second flow cools in each exchange body of the second assembly, means for sending a first fluid to be heated (17) to the first assembly, so that the first fluid is heated in each exchange body (11 A, 11 B, 11 C, 11 D) d e the first assembly and means for sending a second fluid (19) to be heated to a second assembly (13), so that the second fluid is heated in each exchange body of the second assembly (13A, 13B, 13C) characterized in that no means allows a portion of the first flow to cool in the second assembly, that no means allows a portion of the second flow to cool in the first assembly, that no means allows a portion of the first fluid to heat in the second assembly and that no means allows a portion of the second fluid to heat up in the first assembly.
2. . Ligne d'échange selon la revendication 1 comprenant des moyens (3, 5, 7, 9) pour séparer un débit à refroidir en aval des deux assemblées pour former le premier et deuxième débits, de sorte que les premier et deuxième débits à refroidir traversent en série chaque corps d'échange (11A, 11 B, 11C, 11 D, 13A, 13B, 13C) de leur assemblée respective,.2.. Exchange line according to claim 1 comprising means (3, 5, 7, 9) for separating a flow rate to be cooled downstream of the two assemblies to form the first and second flow rates, so that the first and second flow rates to be cooled pass through in series each exchange body (11A, 11B, 11C, 11D, 13A, 13B, 13C) of their respective assembly ,.
3. Ligne d'échange selon l'une des revendications précédentes comprenant deux assemblées d'échange (11 , 13). 3. Exchange line according to one of the preceding claims comprising two exchange assemblies (11, 13).
4. Ligne d'échange selon l'une des revendications précédentes dans laquelle les corps (11 A, 11 B, 11 C, 11 D, 13A, 13B, 13C) d'une assemblée sont alignés dans le sens de leur longueur.4. Exchange line according to one of the preceding claims wherein the bodies (11A, 11B, 11C, 11D, 13A, 13B, 13C) of an assembly are aligned in the direction of their length.
5. Ligne d'échange selon l'une des revendications précédentes dans laquelle les corps (11 A, 11 B, 11 C, 13A, 13B, 13C) d'une assemblée sont disposés avec leur longueur parallèle à celle des corps adjacents.5. Exchange line according to one of the preceding claims wherein the bodies (11A, 11B, 11C, 13A, 13B, 13C) of an assembly are arranged with their length parallel to that of the adjacent bodies.
6. Ligne d'échange selon l'une des revendications précédentes dans laquelle les corps d'une assemblée (11 A, 11 B, 11 C, 13A, 13B, 13C) sont disposés avec leur longueur parallèle à celle des corps adjacents et en quinconce.6. Exchange line according to one of the preceding claims wherein the body of an assembly (11A, 11B, 11C, 13A, 13B, 13C) are arranged with their length parallel to that of the adjacent bodies and staggered.
7. Ligne d'échange selon l'une des revendications précédentes dans laquelle chaque corps d'échange (11 A, 11 B, 11 C, 11 D, 13A, 13B, 13C) est un empilage de plaques rectangulaires (avec éventuellement les coins arrondis). 7. exchange line according to one of the preceding claims wherein each exchange body (11A, 11B, 11C, 11D, 13A, 13B, 13C) is a stack of rectangular plates (with possibly the corners rounded).
8. Ligne d'échange selon l'une des revendications 1 à 6 dans laquelle chaque corps d'échange (11 A, 11 B, 11 C, 11 D, 13A, 13B, 13C) est un empilage de plaques hexagonales irrégulières, des éléments de liaison étant placés de part et d'autre de chaque corps pour le relier au corps adjacent.8. Exchange line according to one of claims 1 to 6 wherein each exchange body (11A, 11B, 11C, 11D, 13A, 13B, 13C) is a stack of irregular hexagonal plates, connecting elements being placed on either side of each body to connect it to the adjacent body.
9. Ligne d'échange selon l'une des revendications précédentes dans lequel au moins un des corps d'échange (11 A, 11 B, 11 C, 11 D, 13A, 13B,9. Exchange line according to one of the preceding claims wherein at least one of the exchange bodies (11A, 11B, 11C, 11D, 13A, 13B,
13C) est un échangeur standardisé, de préférence dans lequel au moins deux des corps d'échange sont du même modèle.13C) is a standardized exchanger, preferably in which at least two of the exchange bodies are of the same model.
10. Appareil de séparation d'air comprenant une colonne de distillation (33) ayant un condenseur de tête (35), une ligne d'échange (11 , 13) telle que revendiquée dans l'une des revendications 1 à 9, des moyens (3, 5, 7, 9) pour envoyer de l'air comprimé et épuré à chacune des assemblées d'échange, des moyens pour soutirer de l'azote gazeux (17) de la colonne, des moyens pour envoyer l'azote gazeux à une première assemblée (11 ) d'échange, des moyens pour envoyer du liquide de cuve de la colonne au condenseur, des moyens pour prélever du liquide vaporisé (19) du condenseur et des moyens pour envoyer le liquide vaporisé à la deuxième assemblée (13). An air separation apparatus comprising a distillation column (33) having a head condenser (35), an exchange line (11, 13) as claimed in one of claims 1 to 9, means (3, 5, 7, 9) for supplying compressed and purified air to each of the exchange assemblies, means for withdrawing nitrogen gas (17) from the column, means for sending the nitrogen gas at a first exchange assembly (11), means for sending column liquid to the condenser, means for taking vaporized liquid (19) from the condenser and means for sending the vaporized liquid to the second assembly ( 13).
11. Appareil selon la revendication 10 comprenant des moyens (7, 9) pour régler la quantité d'air envoyé aux assemblées d'échange.11. Apparatus according to claim 10 comprising means (7, 9) for adjusting the amount of air sent to the exchange assemblies.
12. Appareil selon la revendication 10 ou 11 dans lequel au moins deux corps d'échange (11 A, 11 B, 11 C, 11 D, 13A, 13B, 13C) d'une même assemblée sont placés les uns au dessus des autres, de préférence sont tous les uns au dessus des autres.12. Apparatus according to claim 10 or 11 wherein at least two exchange bodies (11A, 11B, 11C, 11D, 13A, 13B, 13C) of the same assembly are placed one above the other preferably all are above each other.
13. Procédé de refroidissement d'air dans une ligne d'échange, comprenant au moins deux assemblées d'échange (11 , 13), les assemblées étant connectés en parallèle, chaque assemblée comprenant au moins deux corps d'échange (11 A, 11 B, 11 C, 11 D, 13A, 13B, 13C), de préférence au moins trois corps d'échange, connectés en série entre eux, des moyens pour envoyer un premier débit d'air à refroidir à la première assemblée, de sorte que le premier débit se refroidit dans chaque corps d'échange de la première assemblée , des moyens pour envoyer un deuxième débit d'air à refroidir à la deuxième assemblée, de sorte que le deuxième débit se refroidit dans chaque corps d'échange de la deuxième assemblée, des moyens pour envoyer un premier fluide à réchauffer (17) à une première des assemblées d'échange (11 ), de sorte que le premier fluide se réchauffe dans chaque corps d'échange (11 A, 11 B, 11 C, 11 D) de la première assemblée et des moyens pour envoyer un deuxième fluide (19) à réchauffer à une deuxième des assemblées d'échange (13), de sorte que le premier fluide se réchauffe dans chaque corps d'échange de la deuxième assemblée(13A, 13B, 13C) caractérisé en ce que tout le premier débit est envoyé uniquement à la première assemblée, tout le deuxième débit est envoyé uniquement à la deuxième assemblée, tout le premier fluide est envoyé uniquement dans la première assemblée et tout le deuxième fluide est envoyé uniquement à la deuxième assemblée.13. A method of cooling air in an exchange line, comprising at least two exchange assemblies (11, 13), the assemblies being connected in parallel, each assembly comprising at least two exchange bodies (11 A, 11B, 11C, 11D, 13A, 13B, 13C), preferably at least three exchange bodies, connected in series with each other, means for sending a first air flow to be cooled to the first assembly, so that the first flow cools in each exchange body of the first assembly, means for sending a second air flow to be cooled to the second assembly, so that the second flow cools in each exchange body of the second assembly, means for sending a first fluid to be heated (17) to a first of the exchange assemblies (11), so that the first fluid is heated in each exchange body (11 A, 11 B, 11 C, 11 D) of the first meeting and means for e sending a second fluid (19) to be heated to a second of the exchange assemblies (13), so that the first fluid is heated in each exchange body of the second assembly (13A, 13B, 13C) characterized in that all the first flow is sent only to the first assembly, all the second flow is sent only to the second assembly, all the first fluid is sent only in the first assembly and all the second fluid is sent only to the second assembly.
14. Procédé selon la revendication 13 dans lequel les premier et deuxième débits rentrent dans leurs assemblées respectives à des pressions et/ou à des températures différentes.The method of claim 13 wherein the first and second flow rates enter their respective assemblies at different pressures and / or temperatures.
15. Procédé selon la revendication 13 ou 13 dans lequel les premier et deuxième débits sont mélangés en aval des première et deuxième assemblées. 15. The method of claim 13 or 13 wherein the first and second flow rates are mixed downstream of the first and second assemblies.
EP08835215A 2007-09-12 2008-09-09 Main exchange line and cryogenic distillation air separation unit incorporating such an exchange line Withdrawn EP2191220A2 (en)

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FR0757531A FR2920866A1 (en) 2007-09-12 2007-09-12 MAIN EXCHANGE LINE AND CRYOGENIC DISTILLATION AIR SEPARATION APPARATUS INCORPORATING SUCH EXCHANGE LINE
PCT/FR2008/051601 WO2009044065A2 (en) 2007-09-12 2008-09-09 Main exchange line and cryogenic distillation air separation unit incorporating such an exchange line

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WO2009044065A3 (en) 2011-12-08
WO2009044065A2 (en) 2009-04-09
CN102216709A (en) 2011-10-12
BRPI0816327A2 (en) 2015-04-14
JP2011519006A (en) 2011-06-30
US20100206004A1 (en) 2010-08-19
FR2920866A1 (en) 2009-03-13

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