FR2920867A1 - Distillation column i.e. air separation column, for air separation apparatus, has fluid inlet unit connected to point of vaporization passages, gas inlet unit fixed to condensation passages, and vaporizer-condenser formed by exchanger - Google Patents

Distillation column i.e. air separation column, for air separation apparatus, has fluid inlet unit connected to point of vaporization passages, gas inlet unit fixed to condensation passages, and vaporizer-condenser formed by exchanger Download PDF

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Publication number
FR2920867A1
FR2920867A1 FR0757532A FR0757532A FR2920867A1 FR 2920867 A1 FR2920867 A1 FR 2920867A1 FR 0757532 A FR0757532 A FR 0757532A FR 0757532 A FR0757532 A FR 0757532A FR 2920867 A1 FR2920867 A1 FR 2920867A1
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FR
France
Prior art keywords
column
passages
vaporizer
inlet unit
air separation
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Application number
FR0757532A
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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 FR0757532A priority Critical patent/FR2920867A1/en
Publication of FR2920867A1 publication Critical patent/FR2920867A1/en
Withdrawn legal-status Critical Current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
    • F25J3/04624—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 integrated mass and heat exchange, so-called non-adiabatic rectification, e.g. dephlegmator, reflux 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
    • 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
    • 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
    • F25J5/007—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 combined with mass exchange, i.e. in a so-called dephlegmator
    • 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
    • F25J2200/74—Refluxing the column with at least a part of the partially 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
    • 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
    • F25J2250/02—Bath type boiler-condenser using thermo-siphon effect, e.g. with natural or forced circulation or pool boiling, i.e. core-in-kettle 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
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/20—Boiler-condenser with multiple exchanger cores in parallel or with multiple re-boiling or condensing streams
    • 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
    • F25J2290/10—Mathematical formulae, modeling, plot or curves; Design methods
    • 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
    • F25J2290/32—Details on header or distribution passages of heat exchangers, e.g. of reboiler-condenser or plate heat exchangers
    • 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
    • F25J2290/44—Particular materials used, e.g. copper, steel or alloys thereof or surface treatments used, e.g. enhanced surface

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  • 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

The column (1) has a fluid inlet unit connected to a lowest point of vaporization passages, and a gas inlet unit connected to condensation passages, where the column is made up of stainless steel. The fluid inlet unit is formed by a horizontal conduit (17), and the gas inlet unit is formed by a vertical conduit (3). A vaporizer-condenser made up of stainless steel is formed by MAXCHANGER(RTM: Welded Shell plate type heat exchanger) placed on a shell of the column, where the vaporization and condensation passages are shorter than passages in middle of the exchanger.

Description

2920867 La présente invention est relative à une colonne de séparation d'air incorporant un vaporiseur-condenseur. Il est classique d'utiliser des échangeurs à plaques brasées en aluminium pour des échangeurs cryogéniques. The present invention relates to an air separation column incorporating a vaporizer-condenser. It is conventional to use brazed aluminum plate heat exchangers for cryogenic exchangers.

Pour les appareils de petites tailles, les coûts de fabrication sont prohibitifs. Cette technologie est surtout adaptée pour du sur mesure , sur-mesure 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 io fabrication très longs. Le vaporiseur est réalisé en aluminium : il est installé soit dans une virole (vaporiseur immergé dans un bain), soit avec un pot de recirculation externe. Il peut être à déphlegmation du coté condensation.For small devices, manufacturing costs are prohibitive. This technology is especially adapted for tailor-made, custom-made, unjustified on small devices, where it is the cost that overrides the performance of the device. In the same way, the customization generally results in very long manufacturing delays. The vaporizer is made of aluminum: it is installed either in a shell (vaporizer immersed in a bath) or with an external recirculation pot. It can be dephlegmation of the side condensation.

15 Il est connecté aux autres équipements soit à l'aide de jonctions mixtes coûteuses si ces équipements sont en inox (cas le plus courant), soit directement si ceux-ci sont en aluminium. Il est un but de la présente invention de prévoir un vaporiseurcondenseur en plaques d'acier inoxydables, tel que l'on trouve sur le marché 20 en forme standardisée. Les délais de fourniture pour ce genre d'échangeur sont extrêmement courts, leur prix est faible et leur matière rend plus facile l'installation sur une colonne dont la virole est également en acier inoxydable. Selon un objet de l'invention, il est prévu une colonne de distillation 25 incorporant au moins un vaporiseur-condenseur, à plaques, éventuellement d'acier inoxydable, comprenant des passages de vaporisation et des passages de condensation, orientés verticalement, des moyens d'entrée de liquide provenant de la colonne reliés aux passages de vaporisation et des moyens d'entrée de gaz provenant de la colonne reliés aux passages de 30 condensation, caractérisée en ce que les moyens d'entrée de liquide sont reliés au point le plus bas des passages de vaporisation. Selon d'autres aspects de l'invention, il est prévu que : 2 2920867 - les moyens d'entrée de gaz sont constitués par une conduite d'axe vertical ; - les moyens d'entrée de liquide sont constitués par une conduite d'axe horizontal ; 5 - le point le plus bas de la conduite d'entrée de liquide est relié au point le plus bas des passages de vaporisation ; - le vaporiseur condenseur est constitué par au moins deux échangeurs à plaques, éventuellement en acier inoxydable, connectés en parallèle ; io - le vaporiseur-condenseur est constitué par un empilement de plaques identiques superposés et parallèles, chaque plaque ayant deux bords droits parallèles et deux bouts l'un en face de l'autre en forme de V ; - les moyens d'entrée de liquide sont reliés au point le plus bas du vaporiseur ; 15 - le vaporiseur-condenseur est constitué par un modèle prédéfini et/ou préconçu, par exemple d'un modèle préexistant fabriqué par un fabricant d'échangeurs. Un appareil de séparation d'air peut incorporer une colonne telle que décrite ci-dessus.It is connected to other equipment either with costly mixed junctions if this equipment is made of stainless steel (the most common case), or directly if they are made of aluminum. It is an object of the present invention to provide a stainless steel plate vaporizer, as found on the market in standardized form. Delivery times for this type of exchanger are extremely short, their price is low and their material makes it easier to install on a column whose ferrule is also stainless steel. According to one object of the invention, there is provided a distillation column incorporating at least one vaporizer-condenser, with plates, possibly of stainless steel, comprising vaporization passages and condensation passages, oriented vertically, means of distillation. liquid inlet from the column connected to the vaporization passages and gas inlet means from the column connected to the condensation passages, characterized in that the liquid inlet means are connected to the lowest point vaporization passages. According to other aspects of the invention, it is provided that: 2920867 - the gas inlet means are constituted by a pipe of vertical axis; - The liquid inlet means are constituted by a horizontal axis pipe; The lowest point of the liquid inlet pipe is connected to the lowest point of the vaporization passages; - The condenser vaporizer is constituted by at least two plate heat exchangers, optionally stainless steel, connected in parallel; the vaporizer-condenser consists of a stack of identical superimposed and parallel plates, each plate having two parallel straight edges and two ends facing each other in the shape of a V; - The liquid inlet means are connected to the lowest point of the vaporizer; - The vaporizer-condenser is constituted by a predefined model and / or preconceived, for example a pre-existing model manufactured by a manufacturer of exchangers. An air separation apparatus may incorporate a column as described above.

20 Selon un autre aspect de l'invention, il est prévu un procédé de fabrication d'un appareil de séparation d'air par distillation cryogénique, l'appareil comprenant au moins un vaporiseur-condenseur à plaques et une colonne caractérisé en ce que plusieurs modèles d'échangeur sont prédéfinies et le vaporiseur-condenseur est constitué par au moins un 25 échangeur d'un modèle prédéfini. De préférence le vaporiseur-condenseur et la colonne sont en acier inoxydable. Un exemple d'un échangeur à plaques en acier inoxydable soudées standardisé est l'échangeur MAXCHANGER de la marque Tranter.According to another aspect of the invention, there is provided a method of manufacturing an apparatus for separating air by cryogenic distillation, the apparatus comprising at least one evaporator-plate condenser and a column characterized in that several exchanger models are predefined and the vaporizer-condenser is constituted by at least one exchanger of a predefined model. Preferably the vaporizer-condenser and the column are made of stainless steel. An example of a standardized welded stainless steel plate heat exchanger is the MAXCHANGER heat exchanger of the Tranter brand.

30 Ce genre d'échangeur peut être utilisé en déphlegmateur dans les passages de condensation : pour éviter l'engorgement, on pourra éventuellement modifier l'empilage des plaques avec deux passages de condensation pour un passage de vaporisation.This type of exchanger can be used as a dephlegmator in the condensation passages: to avoid clogging, it is possible to modify the stacking of the plates with two condensation passages for a vaporization passage.

3 2920867 Si nécessaire, plusieurs échangeurs peuvent être mis en parallèle si nécessaire pour faire l'échange thermique en remplissant les fonctions du vaporiseur. L'échangeur peut être installé soit dans une virole en acier inoxydable 5 d'une colonne de distillation, soit fixée à la colonne de distillation avec un pot de recirculation en acier inoxydable. L'échangeur peut être accroché au dessus de la colonne en acier inoxydable. L'échangeur peut être installé dans une boite froide sous vide. io Le design permet de plus d'éviter des zones mortes au niveau de l'entrée du liquide riche, ce qui est nécessaire pour éviter des concentrations en hydrocarbures localement. Ceci est dû à la façon dont est faite la distribution du fluide : ceci est radicalement différent de ce qui se fait classiquement sur les échangeurs en 15 acier inoxydable (par exemple sur ceux de Alfalaval ou Swep), où l'on a un distributeur avec une zone morte sous celui-ci. Dans les vaporiseurs des colonnes selon l'invention, le liquide provenant de la colonne rentre dans les passages de vaporisation en passant au moins en partie par la partie la plus basse du vaporiseur. De 20 cette manière le liquide balaie toute la surface des passages de vaporisation et il n'y a pas de zones où peuvent s'accumuler des impuretés. L'invention sera décrite en plus de détail en se référant à la figure qui montre le haut d'une colonne de distillation équipée d'un vaporiseurcondenseur selon l'invention.3 2920867 If necessary, several exchangers can be connected in parallel if necessary to make the heat exchange by fulfilling the functions of the vaporizer. The exchanger may be installed either in a stainless steel ferrule of a distillation column or attached to the distillation column with a stainless steel recirculation pot. The exchanger can be hung on top of the stainless steel column. The exchanger can be installed in a cold box under vacuum. The design also makes it possible to avoid dead zones at the inlet of the rich liquid, which is necessary to avoid hydrocarbon concentrations locally. This is due to the way in which the fluid distribution is made: this is radically different from what is conventionally done on stainless steel exchangers (for example those of Alfalaval or Swep), where there is a distributor with a dead zone beneath it. In the column vaporizers of the invention, the liquid from the column enters the vaporization passages passing at least in part through the lower part of the vaporizer. In this way the liquid sweeps the entire surface of the vaporization passages and there are no areas where impurities can accumulate. The invention will be described in more detail with reference to the figure which shows the top of a distillation column equipped with a vaporizercondenser according to the invention.

25 La colonne 1 est une colonne de distillation d'air à basse température pour la production d'azote. De manière connue, un débit d'air comprimé, épuré et refroidi entre en bas de la colonne et est séparé en un liquide enrichi en oxygène et un gaz enrichi en azote par distillation sur un nombre de plateaux ou de garnissages.Column 1 is a low temperature air distillation column for the production of nitrogen. In known manner, a flow of compressed, purified and cooled air between the bottom of the column and is separated into an oxygen-enriched liquid and a nitrogen-enriched gas by distillation on a number of trays or packings.

30 L'azote gazeux monte verticalement via une conduite 3 fixée au sommet de la colonne et rentre dans un échangeur de chaleur 6 du type MAXCHANGER de la société Telford, tel que décrit dans le brevet US-A-5469914. Cet échangeur possède deux cotés en forme de V en haut et en 4 2920867 bas 7, 9 et deux côtés parallèles verticaux 5. Les plaques soudées utilisées sont en acier inoxydable. Sinon des plaques brasées en aluminium peuvent être utilisées. Les passages juxtaposant les deux bords parallèles sont plus courts que les passages au milieu de l'échangeur.The nitrogen gas rises vertically via a pipe 3 fixed to the top of the column and enters a heat exchanger 6 of the MAXCHANGER type from Telford, as described in US-A-5469914. This exchanger has two V-shaped sides at the top and at the bottom 29, 8, 9 and two vertical parallel sides 5. The welded plates used are made of stainless steel. Otherwise brazed aluminum plates can be used. The passages juxtaposing the two parallel edges are shorter than the passages in the middle of the exchanger.

5 Le côté gauche du V 7 est relié à la conduite verticale 3 et le côté droit à la conduite horizontale 17. Le côté gauche du V 9 est relié au distributeur 11 et le côté droit à la conduite horizontale 15. Les conduites 3, 17, 19 sont coupées en biseauté de sorte que la io longueur de la coupe est égale à la longueur du côté en V. De liquide enrichi en oxygène provenant de la cuve de la colonne est détendu et envoyé à une conduite 23 fixée au haut d'un pot de recirculation 19. Le liquide passe par la conduite 17 en bas de l'échangeur, monte dans les passages de vaporisation de l'échangeur 6 et ressort, au moins 15 partiellement vaporisé, par la conduite 15. Ainsi le liquide provenant de la colonne rentre dans les passages de vaporisation en passant au moins en partie par la partie la plus basse du vaporiseur. Un débit de purge est soutiré régulièrement par la conduite 21 pour éviter l'accumulation d'impuretés.The left side of the V 7 is connected to the vertical pipe 3 and the right side to the horizontal pipe 17. The left side of the V 9 is connected to the distributor 11 and the right side to the horizontal pipe 15. The pipes 3, 17 19, are cut beveled so that the length of the cut is equal to the length of the V-side. Oxygen-enriched liquid from the bottom of the column is expanded and sent to a pipe 23 attached to the top of the column. A recirculation pot 19. The liquid passes through the pipe 17 at the bottom of the exchanger, rises in the vaporization passages of the exchanger 6 and leaves, at least partially vaporized, through line 15. Thus the liquid coming from the column enters the vaporization passages passing at least partly through the lower part of the vaporizer. A purge flow rate is withdrawn regularly by the pipe 21 to prevent the accumulation of impurities.

20 De l'azote condensé dans les passages de condensation retombe dans la colonne à travers la conduite 3. De l'azote gazeux passe verticalement à travers les passages de condensation et arrive en haut des passages dans le collecteur 11 et ensuite dans la conduite 13 formant le produit de l'appareil. 25 5 Condensed nitrogen in the condensing passages falls into the column through line 3. Nitrogen gas passes vertically through the condensing passages and arrives at the top of the passages in manifold 11 and then in line 13. forming the product of the apparatus. 25 5

Claims (10)

REVENDICATIONS 1. Colonne de distillation (1) incorporant au moins un vaporiseurcondenseur (6), à plaques, éventuellement d'acier inoxydable, comprenant des passages de vaporisation et des passages de condensation, orientés verticalement, des moyens d'entrée de liquide (17) provenant de la colonne reliés aux passages de vaporisation et des moyens d'entrée de gaz provenant de la colonne (3) reliés aux passages de condensation, caractérisée en ce que les moyens d'entrée de liquide (17) sont reliés io au point le plus bas des passages de vaporisation. Distillation column (1) incorporating at least one plate vaporizer (6), optionally of stainless steel, comprising vaporization passages and condensation passages, vertically oriented, liquid inlet means (17) from the column connected to the vaporization passages and the gas inlet means from the column (3) connected to the condensation passages, characterized in that the liquid inlet means (17) are connected to the point lower vaporization passages. 2. Colonne selon la revendication 1 dans laquelle les moyens d'entrée de gaz sont constitués par une conduite (3) d'axe vertical. 15 2. Column according to claim 1 wherein the gas inlet means are constituted by a pipe (3) of vertical axis. 15 3. Colonne selon l'une des revendications 1 et 2 dans laquelle les moyens d'entrée de liquide sont constitués par une conduite (17) d'axe horizontal. 3. Column according to one of claims 1 and 2 wherein the liquid inlet means are constituted by a pipe (17) of horizontal axis. 4. Colonne selon la revendication 3 dans laquelle le point le plus bas 20 de la conduite d'entrée de liquide est relié au point le plus bas des passages de vaporisation. The column of claim 3 wherein the lowest point of the liquid inlet pipe is connected to the lowest point of the vaporization passages. 5. Colonne selon une des revendications précédentes dans laquelle le vaporiseur condenseur est constitué par au moins deux échangeurs à 25 plaques, éventuellement en acier inoxydable, connectés en parallèle. 5. Column according to one of the preceding claims wherein the condenser vaporizer is constituted by at least two plate exchangers, optionally stainless steel, connected in parallel. 6. Colonne selon l'une des revendications précédentes dans laquelle le vaporiseur-condenseur est constitué par un empilement de plaques identiques superposés et parallèles, chaque plaque ayant deux bords droits 30 parallèles (5) et deux bouts (7, 9) l'un en face de l'autre en forme de V. 6. Column according to one of the preceding claims wherein the vaporizer-condenser is constituted by a stack of identical plates superimposed and parallel, each plate having two parallel straight edges (5) and two ends (7, 9) one in front of the other V-shaped. 7. Colonne selon une des revendications précédentes dans laquelle les moyens d'entrée de liquide sont reliés au point le plus bas du vaporiseur. 6 2920867 7. Column according to one of the preceding claims wherein the liquid inlet means are connected to the lowest point of the vaporizer. 6 2920867 8. Colonne selon l'une des revendications précédentes dans laquelle le vaporiseur-condenseur est constitué par au moins un échangeur d'un modèle standardisé. 8. Column according to one of the preceding claims wherein the vaporizer-condenser is constituted by at least one exchanger of a standardized model. 9. Colonne selon la revendication 8 dans laquelle le vaporiseur-5 condenseur et la colonne sont en acier inoxydable. 9. Column according to claim 8 wherein the condenser vaporizer and the column are made of stainless steel. 10. Appareil de séparation d'air incorporant une colonne selon l'une des revendications 1 à 9.10 10. Air separation apparatus incorporating a column according to one of claims 1 to 9.10
FR0757532A 2007-09-12 2007-09-12 Distillation column i.e. air separation column, for air separation apparatus, has fluid inlet unit connected to point of vaporization passages, gas inlet unit fixed to condensation passages, and vaporizer-condenser formed by exchanger Withdrawn FR2920867A1 (en)

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FR0757532A FR2920867A1 (en) 2007-09-12 2007-09-12 Distillation column i.e. air separation column, for air separation apparatus, has fluid inlet unit connected to point of vaporization passages, gas inlet unit fixed to condensation passages, and vaporizer-condenser formed by exchanger

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FR0757532A FR2920867A1 (en) 2007-09-12 2007-09-12 Distillation column i.e. air separation column, for air separation apparatus, has fluid inlet unit connected to point of vaporization passages, gas inlet unit fixed to condensation passages, and vaporizer-condenser formed by exchanger

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2102974A1 (en) * 1971-01-22 1972-08-03 Linde Ag, 6200 Wiesbaden Heat exchangers, especially as an evaporator-condenser
FR2431103A1 (en) * 1978-07-12 1980-02-08 Air Liquide Low-temp. fractionation column for sepg. gaseous mixt. - superposed compartments interconnected by vaporiser-condenser circumscribed by column ensuring max. compactness
GB2289122A (en) * 1994-05-06 1995-11-08 Imi Marston Ltd Heat exchanger for oxygen/nitrogen liquefaction
US5469914A (en) * 1993-06-14 1995-11-28 Tranter, Inc. All-welded plate heat exchanger
WO2004109211A1 (en) * 2003-05-30 2004-12-16 Uop Llc Method for making brazed heat exchanger and apparatus
US20050028554A1 (en) * 2000-05-31 2005-02-10 Alfred Wanner Multistoreyed bath condenser

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2102974A1 (en) * 1971-01-22 1972-08-03 Linde Ag, 6200 Wiesbaden Heat exchangers, especially as an evaporator-condenser
FR2431103A1 (en) * 1978-07-12 1980-02-08 Air Liquide Low-temp. fractionation column for sepg. gaseous mixt. - superposed compartments interconnected by vaporiser-condenser circumscribed by column ensuring max. compactness
US5469914A (en) * 1993-06-14 1995-11-28 Tranter, Inc. All-welded plate heat exchanger
GB2289122A (en) * 1994-05-06 1995-11-08 Imi Marston Ltd Heat exchanger for oxygen/nitrogen liquefaction
US20050028554A1 (en) * 2000-05-31 2005-02-10 Alfred Wanner Multistoreyed bath condenser
WO2004109211A1 (en) * 2003-05-30 2004-12-16 Uop Llc Method for making brazed heat exchanger and apparatus

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