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EP2367626A1 - Corrugated criss-crossing packing and column including such a packing - Google Patents

Corrugated criss-crossing packing and column including such a packing

Info

Publication number
EP2367626A1
EP2367626A1 EP09768194A EP09768194A EP2367626A1 EP 2367626 A1 EP2367626 A1 EP 2367626A1 EP 09768194 A EP09768194 A EP 09768194A EP 09768194 A EP09768194 A EP 09768194A EP 2367626 A1 EP2367626 A1 EP 2367626A1
Authority
EP
European Patent Office
Prior art keywords
strip
lamella
element according
strips
valley
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Withdrawn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
EP09768194A
Other languages
German (de)
French (fr)
Inventor
Gilles Lebain
François LECLERCQ
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 EP2367626A1 publication Critical patent/EP2367626A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/32—Packing elements in the form of grids or built-up elements for forming a unit or module inside the apparatus for mass or heat transfer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/322—Basic shape of the elements
    • B01J2219/32203—Sheets
    • B01J2219/3221—Corrugated sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/322—Basic shape of the elements
    • B01J2219/32203—Sheets
    • B01J2219/32213—Plurality of essentially parallel sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/322—Basic shape of the elements
    • B01J2219/32203—Sheets
    • B01J2219/32224—Sheets characterised by the orientation of the sheet
    • B01J2219/32227—Vertical orientation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/322—Basic shape of the elements
    • B01J2219/32203—Sheets
    • B01J2219/32237—Sheets comprising apertures or perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/322—Basic shape of the elements
    • B01J2219/32203—Sheets
    • B01J2219/32248—Sheets comprising areas that are raised or sunken from the plane of the sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/324—Composition or microstructure of the elements
    • B01J2219/32408—Metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85938—Non-valved flow dividers

Definitions

  • the present invention relates to a cross-corrugated packing and to a column incorporating such packing.
  • the packings ordinarily used are constituted by corrugated strips comprising parallel alternating corrugations each arranged in a vertical general plane and against each other. The undulations are oblique and descend in opposite directions from one band to the next. The perforation rate is about 10% for these so-called cross-corrugated packings.
  • Figure 1 is an isometric perspective view of six stacked packing strips.
  • GB-A-1004046 discloses packings of the cross-corrugated type.
  • CA-A-1095827 proposes an improvement of this type of lining by adding a small diameter dense perforation to allow the liquid to pass cross corrugated strips on either side.
  • This lining is generally made from flat product, namely metal sheets in the form of strips 1, 2 as shown in FIG. 1.
  • the strips are first folded (or bent) so as to form a kind of corrugated sheet. in band whose corrugations are oblique with respect to the axis of the band.
  • the folded strips are then cut into sections and then stacked by alternately turning one band out of two.
  • the "small" size perforations (such as the capillary forces of the liquid are sufficient to maintain a good wetting).
  • Such perforations may be filled with a film of continuous liquid or small enough that the liquid bypasses them without creating a dry zone downstream, for example the references: 1, 2, 3, 4, 5, 6.
  • An object of the invention is to present a lining having a cross corrugated base in which planar elements would be integrated in order to reduce the energy dissipations. These elements would possibly be made by cuts whose edges are in a direction close to the line of greater slope. These plans would have at least one link and at least one point of contact with the crossed corrugated structure thus promoting their wetting.
  • a regular packing element intended for material and / or heat exchange columns comprising alternately a plurality of lamellae, each lamella being corrugated, of generally rectangular shape, the lamellae being arranged against each other, so that the corrugations passing through a lamellae are oriented at between 50 ° and 100 ° of the undulations of the adjacent lamella, thus forming a corrugated-cross structure, at least one strip contacting at least one a first peak of a lamella and at least a second peak of the lamella, the second peak being adjacent to the first peak and characterized in that the or each strip is cut in the lamella so as to leave a slot in the corrugation .
  • each lamella being corrugated, of generally rectangular shape, the lamellae being arranged against each other, so that the corrugations passing through a lamellae are oriented at between 50 ° and 100 ° of the undulations of the adjacent lamella, thus forming a corrugated-cross structure,
  • At least one strip cut in the strip so as to leave a slot in the corrugation, contacts at least one first valley of a lamella and at least a second valley of the lamella, the second valley being adjacent to the first valley;
  • the strips are cut in the lamella, leaving a slit in the corrugation of the same shape as the strip; the strips are of triangular or parallelepipedal shape;
  • a strip is formed by two triangular or parallelepiped elements, one joining a crest of a lamella and another joining the adjacent crest, the two elements joining between two ridges;
  • the strips extend at an angle of between 10 ° and 60 ° to the ridges (valleys) of the lamella;
  • the strip is elongated, preferably flat, one side of the strip being attached to a ridge (a valley);
  • the length of the strip is greater than the wavelength of the strip, preferably at least twice the wavelength of the strip.
  • the inserted flat parts connect peaks or valleys of waves between them. This locally avoids the turbulence of the packing wave stacked at 90 °.
  • FIGS. 4A and 4B schematically show a lamella of a packing according to the invention seen from above and from below
  • FIG. 5 shows a packing lamella according to the invention seen from the side
  • FIGS. 6A and 6B schematically show a lamella of FIG.
  • FIG. 7 shows two superimposed lamellae of a packing according to the invention seen from above, with an overview of the lower lamella
  • FIGS. 8, 9 and 10 show perspectives. isometric of a lamella of a lining according to the invention.
  • Figure 4A shows a top view of a slat 1 with a series of strips 7, each connecting only two successive peaks 3, at the same height of the slat.
  • Figure 4B shows a bottom view of a lamella 1 with a series of strips 9, each connecting only two successive valleys 9, at the same height of the lamella.
  • Figures 4A and 4B could be combined so that the coverslip comprises a series of strips connecting the crests and another set of strips connecting the valleys, the two sets being spaced from each other.
  • the "classical" profile of the crossed corrugated is noticeable for the lamella 1.
  • the strip or strips 9 in fact constituted (s) by a series of planes, connect the valleys 5 of the lamella 1.
  • Figures 6A and 6B show a version of Figures 4A and 4B including a second set of strips, which Figures 6A and 6B can obviously be combined.
  • Figure 7 shows two lamellae each having only two sets of strips 7 connecting the ridges. The distance between two series of peaks is chosen so that the slots of a lamella 1 do not overlap those of the successive lamella 2.
  • FIG. 8 is a perspective view of a packing strip according to the invention.
  • the strip 1 generally comprises at least one cut forming a parallelepiped strip ABCD having at least one of the following characteristics:
  • At least one of the edges AD or BC has a direction less than 20 °, or even less than 10 ° of the line of greatest slope, this line being defined as (definition to be added .)
  • one side AB (or CD) is a fold located on a crest 3 (or a valley 5) of the lamella 1 forming part of the crossed corrugated packing.
  • This side has the same inclination with respect to the horizontal as the angle of inclination ⁇ of the channels (generally between 45 and 60 °)
  • the last side CD is an edge obtained by cutting and is positioned in such a way that the plane ABCD comes into contact with another element of the lamella 1 (for example only the successive ridge 3).
  • a plane 7 connected to a peak 3 of a lamella 1 can contact the plane 7A connected with a successive ridge 3A of the same lamella.
  • the plane integrated in the crossed corrugated packing is made from two parallelepipeds: ABCD (plane 7) which would be connected to the lamella 1 by the side AB coincides with the crest 3
  • the strip is constituted by two planes 7.7A.
  • the constraint for promoting the passage of the liquid from one facet to the other is to have a superposition and contact of a part of their surface between them (here represented by the parallelogram A 1 B 11 CD ")
  • the packing modules according to the invention can of course include other devices.
  • EP 0190435 Sulzer 1985 Non-staggered embossing in quincunx Devices to avoid clogging at the interface between packings, such as those described in the following patents:
  • the invention allows a reduction of investments on the distillation column.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The invention relates to a uniform packing element intended for material and/or heat exchange columns, including alternately a plurality of strips (1, 2), each strip being corrugated, with a generally rectangular shape, the strips being arranged against one another, such that the corrugations crossing one strip are directed at 50º to 100º in relation to the corrugations of the adjacent structure, thus forming a corrugated criss-crossing structure, at least one annulet (7, 9) simultaneously contacting at least one first ridge (3, 5) of a strip and at least one second ridge of the strip, the second ridge being adjacent to the first ridge.

Description

Garnissage ondulé-croisé et colonne incorporant un tel garnissage Cross-corrugated packing and column incorporating such packing
La présente invention est relative à un garnissage ondulé-croisé et à une colonne incorporant un tel garnissage. Les garnissages ordinairement utilisés sont constitués par des bandes ondulées comprenant des ondulations alternées parallèles disposées chacune dans un plan général vertical et les unes contre les autres. Les ondulations sont obliques et descendent dans des sens opposés d'une bande à la suivante. Le taux de perforation est d'environ 10 % pour ces garnissages dits ondulés- croisés.The present invention relates to a cross-corrugated packing and to a column incorporating such packing. The packings ordinarily used are constituted by corrugated strips comprising parallel alternating corrugations each arranged in a vertical general plane and against each other. The undulations are oblique and descend in opposite directions from one band to the next. The perforation rate is about 10% for these so-called cross-corrugated packings.
La Figure 1 est une vue en perspective isométrique de six bandes de garnissages empilées.Figure 1 is an isometric perspective view of six stacked packing strips.
GB-A-1004046 divulgue des garnissages du type ondulé-croisé.GB-A-1004046 discloses packings of the cross-corrugated type.
CA-A-1095827 propose une amélioration de ce type de garnissage en ajoutant une perforation dense de petit diamètre pour permettre au liquide de transiter de part et d'autre des bandes ondulées croisées.CA-A-1095827 proposes an improvement of this type of lining by adding a small diameter dense perforation to allow the liquid to pass cross corrugated strips on either side.
Ce garnissage est généralement fabriqué à partir de produit plat, à savoir des feuilles métalliques sous forme de bandes 1 ,2 comme illustré à la Figure 1. Les bandes sont d'abord pliées (ou cintrées) de façon à former une sorte de tôle ondulée en bande dont les ondulations sont obliques par rapport à l'axe de la bande. Les bandes pliées sont ensuite découpées en tronçons puis empilées en retournant alternativement une bande sur deux.This lining is generally made from flat product, namely metal sheets in the form of strips 1, 2 as shown in FIG. 1. The strips are first folded (or bent) so as to form a kind of corrugated sheet. in band whose corrugations are oblique with respect to the axis of the band. The folded strips are then cut into sections and then stacked by alternately turning one band out of two.
Les tronçons de garnissage ainsi obtenus sont appelés en anglais « packs ». Dans le cas d'ondulations simples, comme illustré aux Figures 2 et 3, les différents paramètres permettant de décrire un garnissage ondulé-croisé sont : la hauteur des ondes (H), l'angle de pliage (Y), le rayon de courbure (r) et l'inclinaison des ondes (δ). De lignes de crête 3 et des lignes de vallée 5 sont ainsi formées. The sections of packing thus obtained are called in English "packs". In the case of simple corrugations, as shown in Figures 2 and 3, the various parameters for describing a cross-corrugated packing are: the wave height (H), the bend angle (Y), the radius of curvature (r) and the inclination of the waves (δ). Ridge lines 3 and valley lines 5 are thus formed.
Ces différents brevets décrivent l'ajout de perforations dans la bande de garnissage pour diverses raisons, principalement, pour favoriser l'étalement du liquide, l'échange de liquide entre les deux faces de la bande et la turbulence de la phase vapeur. On peut classer ces perforations dans deux grandes catégories : These various patents describe the addition of perforations in the packing strip for various reasons, mainly to promote the spreading of the liquid, the exchange of liquid between the two faces of the strip and the turbulence of the vapor phase. These perforations can be classified into two broad categories:
- Les perforations de "petite" dimension (telles que les forces de capillarité du liquide sont suffisantes pour conserver un bon mouillage). De telles perforations peuvent être remplies par un film de liquide continu ou suffisamment petites pour que le liquide les contourne sans créer une zone sèche en aval, par exemple les références : 1 , 2, 3, 4, 5, 6.- The "small" size perforations (such as the capillary forces of the liquid are sufficient to maintain a good wetting). Such perforations may be filled with a film of continuous liquid or small enough that the liquid bypasses them without creating a dry zone downstream, for example the references: 1, 2, 3, 4, 5, 6.
- Les perforations de "grande" dimension, ou les fentes largement ouvertes. De telles perforations ont généralement pour but de favoriser la turbulence de la phase vapeur (cf. figure 1 ), mais peuvent avoir l'inconvénient de gêner l'écoulement du liquide et de créer des zones sèches en aval, par exemple les références : 7, 8, 9, 10, 11. Par contre les références 13 et 14 ont l'avantage de ne pas trop perturber le liquide tout en augmentant les turbulences côté gaz mais aux dépend de contraintes géométriques sévères. - "Large" size perforations, or wide open slots. Such perforations are generally intended to promote the turbulence of the vapor phase (see FIG. 1), but may have the disadvantage of impeding the flow of the liquid and creating dry zones downstream, for example the references: , 8, 9, 10, 11. On the other hand, the references 13 and 14 have the advantage of not disturbing the liquid too much while increasing turbulence on the gas side but at the expense of severe geometrical constraints.
1.1. L 'ajout de bande plane entre 2 bandes ondulées croisées.1.1. The addition of plane band between 2 crossed wavy bands.
L'ajout de ces bandes planes est surtout motivé pour réduire voire supprimer les perturbations gaz / gaz se produisant dans le garnissage. En effet les canaux de deux bandes de garnissage étant orientés à 90°, les deux veines gazeuses se perturbent à l'interface : la conséquence est un mouvement d'hélice des deux veines gazeuses. Ces frottements sont à l'origine d'une grande partie des pertes de charge et ne sont pas totalement intéressantes pour l'échange de matière. En ajoutant les bandes planes, cela élimine ce phénomène de rouleaux et donc diminue les dissipations d'énergie. Les inconvénients de l'ajout de bandes planes sont multiples : - La densité globale du nouveau garnissage est augmentée. Il faut donc augmenter la hauteur de l'ondulé croisé pour arriver à une densité globale équivalente. Ceci accentue le profil de concentration au sein de la veine gazeuse et donc diminue les performances de séparation. - Ce phénomène de tourbillon de la veine gazeuse permet un renouvellement de la sous-couche visqueuse à l'interface avec le liquide. Dans un second ordre il contribue à l'échange de matière. Par conséquent en le supprimant totalement par ajout de tôle plane, nous supprimons ce léger avantage.The addition of these flat strips is mainly motivated to reduce or even eliminate the gas / gas disturbances occurring in the lining. Indeed the channels of two packing strips being oriented at 90 °, the two gas streams are disturbed at the interface: the consequence is a propeller movement of the two gaseous veins. This friction is at the origin of a large part of the pressure drop and is not totally interesting for the exchange of material. By adding the flat strips, this eliminates this phenomenon of rolls and therefore decreases the energy dissipation. The disadvantages of adding flat strips are multiple: - The overall density of the new lining is increased. It is therefore necessary to increase the height of the crossed corrugated to arrive at an equivalent overall density. This accentuates the concentration profile within the gas stream and thus decreases the separation performance. - This phenomenon of vortex of the gas vein allows a renewal of the viscous sub-layer at the interface with the liquid. In a second order it contributes to the exchange of matter. Therefore by removing it completely by adding flat sheet, we remove this slight advantage.
- Le mouillage complet de la tôle plane n'est pas évident à assurer. Grâce à l'inclinaison des canaux, une goutte de liquide tombant d'un garnissage finit toujours par rencontrer de l'aluminium. Par contre, à moins de mouiller sur la tranche du feuillard d'aluminium (d'épaisseur 0,2 mm), il n'est pas garanti d'avoir une surface installée correctement mouillée.- The complete wetting of the flat sheet is not easy to ensure. Thanks to the inclination of the channels, a drop of liquid falling from a lining always ends up meeting aluminum. On the other hand, unless wet on the edge of the aluminum strip (thickness 0.2 mm), it is not guaranteed to have a properly installed wet surface.
Comme décrit auparavant, il est difficile de concilier l'intensification de la turbulence de la phase vapeur et un écoulement du liquide soit par déformation locale ou par ajout de tôle plane entre deux éléments de garnissage ondulé croisé. Un but de l'invention est de présenter un garnissage ayant une base d'ondulée croisé dans laquelle seraient intégrés des éléments plans en vue de diminuer les dissipations d'énergie. Ces éléments seraient éventuellement réalisés par des découpes dont les bords sont dans une direction proche de la ligne de plus grande pente. Ces plans auraient au moins un lien et au moins un point de contact avec la structure d'ondulé croisé favorisant ainsi leur mouillage.As previously described, it is difficult to reconcile the intensification of the turbulence of the vapor phase and a flow of the liquid either by local deformation or by adding flat sheet between two elements of crossed corrugated packing. An object of the invention is to present a lining having a cross corrugated base in which planar elements would be integrated in order to reduce the energy dissipations. These elements would possibly be made by cuts whose edges are in a direction close to the line of greater slope. These plans would have at least one link and at least one point of contact with the crossed corrugated structure thus promoting their wetting.
Selon un objet de l'invention, il est prévu un élément de garnissage régulier destiné à des colonnes d'échange de matière et/ou de chaleur comprenant en alternance une pluralité de lamelles, chaque lamelle étant ondulée, de forme générale rectangulaire, les lamelles étant disposées les unes contre les autres, de sorte que les ondulations traversant une lamelles sont orientées à entre 50° et 100° des ondulations de la lamelle adjacente, ainsi formant une structure ondulée-croisée, au moins une bandelette contactant à la fois au moins une première crête d'une lamelle et au moins une deuxième crête de la lamelle, la deuxième crête étant adjacente à la première crête et caractérisé en ce que la ou chaque bandelette est découpée dans la lamelle de manière à laisser une fente dans l'ondulation. Selon d'autres aspects facultatifs :According to an object of the invention, there is provided a regular packing element intended for material and / or heat exchange columns comprising alternately a plurality of lamellae, each lamella being corrugated, of generally rectangular shape, the lamellae being arranged against each other, so that the corrugations passing through a lamellae are oriented at between 50 ° and 100 ° of the undulations of the adjacent lamella, thus forming a corrugated-cross structure, at least one strip contacting at least one a first peak of a lamella and at least a second peak of the lamella, the second peak being adjacent to the first peak and characterized in that the or each strip is cut in the lamella so as to leave a slot in the corrugation . According to other optional aspects:
- au moins une bandelette, découpée dans la lamelle de manière à laisser une fente dans l'ondulation, contacte à la fois au moins une première vallée d'une lamelle et au moins une deuxième vallée de la lamelle, la deuxième vallée étant adjacente à la première vallée ;at least one strip, cut in the strip so as to leave a slot in the corrugation, contacts at least one first valley of a lamella and at least a second valley of the lamella, the second valley being adjacent to the first valley;
- les bandelettes sont découpées dans la lamelle, laissant une fente dans l'ondulation de la même forme que la bandelette ; - les bandelettes sont de forme triangulaire ou parallélépipédique ;the strips are cut in the lamella, leaving a slit in the corrugation of the same shape as the strip; the strips are of triangular or parallelepipedal shape;
- une bandelette est formé par deux éléments triangulaires ou parallélépipédiques, un rejoignant une crête d'une lamelle et un autre rejoignant la crête adjacente, les deux éléments se rejoignant entre deux crêtes ;- A strip is formed by two triangular or parallelepiped elements, one joining a crest of a lamella and another joining the adjacent crest, the two elements joining between two ridges;
- les bandelettes s'étendent à un angle d'entre 10° et 60° aux crêtes (aux vallées) de la lamelle ;the strips extend at an angle of between 10 ° and 60 ° to the ridges (valleys) of the lamella;
- la bandelette est de forme allongée, de préférence plat, un côté de la bandelette étant attaché à une crête (une vallée) ;- The strip is elongated, preferably flat, one side of the strip being attached to a ridge (a valley);
- la bandelette s'étend juste au-delà de la crête adjacente ;- the strip extends just beyond the adjacent ridge;
- un côté opposé de la bandelette étant contiguë avec la crête (la vallée) adjacente ;- an opposite side of the strip being contiguous with the adjacent ridge (valley);
- la longueur de la bandelette est supérieure à la longueur d'onde de la lamelle, de préférence au moins deux fois supérieure à la longueur d'onde de la lamelle.the length of the strip is greater than the wavelength of the strip, preferably at least twice the wavelength of the strip.
Selon un autre aspect de l'invention, il est prévu une colonne d'échange de matière et/ou de chaleur équipée d'un élément tel que décrit ci-dessus, les lamelles étant orientées verticalement, par exemple une colonne de distillation cryogénique, en particulier de l'air.According to another aspect of the invention, there is provided a material exchange column and / or heat equipped with an element as described above, the lamellae being oriented vertically, for example a cryogenic distillation column, especially air.
Les parties planes insérées relient des crêtes ou des vallées d'ondes entre elles. Ceci évite localement les turbulences de l'onde de garnissage empilé à 90°.The inserted flat parts connect peaks or valleys of waves between them. This locally avoids the turbulence of the packing wave stacked at 90 °.
L'invention sera décrite en plus de détail en se référant aux figures. Les Figures 4A et 4B montrent schématiquement une lamelle d'une garnissage selon l'invention vu de dessus et de dessous, la Figure 5 montre une lamelle de garnissage selon l'invention vu de côté, les Figures 6A et 6B montrent schématiquement une lamelle d'une garnissage selon l'invention vu de dessus et de dessous, la Figure 7 montre deux lamelles superposées d'un garnissage selon l'invention vu de dessus, avec aperçu de la lamelle inférieure, les Figures 8,9 et 10 montrent des perspectives isométrique d'une lamelle d'un garnissage selon l'invention. La Figure 4A montre une vue de dessus d'une lamelle 1 avec une série de bandelettes 7, chacune reliant seulement deux crêtes successives 3, à la même hauteur de la lamelle.The invention will be described in more detail with reference to the figures. FIGS. 4A and 4B schematically show a lamella of a packing according to the invention seen from above and from below, FIG. 5 shows a packing lamella according to the invention seen from the side, FIGS. 6A and 6B schematically show a lamella of FIG. According to the invention seen from above and from below, FIG. 7 shows two superimposed lamellae of a packing according to the invention seen from above, with an overview of the lower lamella, FIGS. 8, 9 and 10 show perspectives. isometric of a lamella of a lining according to the invention. Figure 4A shows a top view of a slat 1 with a series of strips 7, each connecting only two successive peaks 3, at the same height of the slat.
La Figure 4B montre une vue de dessous d'une lamelle 1 avec une série de bandelettes 9, chacune reliant seulement deux vallées successives 9, à la même hauteur de la lamelle.Figure 4B shows a bottom view of a lamella 1 with a series of strips 9, each connecting only two successive valleys 9, at the same height of the lamella.
Il sera compris que les Figures 4A et 4B pourraient être combinées de sorte que la lamelle comprenne une série de bandelettes reliant les crêtes et une autre série de bandelettes reliant les vallées, les deux séries étant espacées les unes des autres.It will be understood that Figures 4A and 4B could be combined so that the coverslip comprises a series of strips connecting the crests and another set of strips connecting the valleys, the two sets being spaced from each other.
Sur le dessin de la Figure 5 est représentée une vue dans l'axe des plis.In the drawing of Figure 5 is shown a view in the axis of the folds.
Le profil « classique » de l'ondulé croisé se remarque pour la lamelle 1. La ou les bandelettes 7, en fait constituée(s) par une série de plans, relient les crêtesThe "classical" profile of the crossed corrugated is noticeable for the lamella 1. The strip or strips 7, in fact constituted by a series of planes, connect the ridges
3 de la lamelle. La ou les bandelettes 9, en fait constituée(s) par une série de plans, relient les vallées 5 de la lamelle 1.3 of the coverslip. The strip or strips 9, in fact constituted (s) by a series of planes, connect the valleys 5 of the lamella 1.
Les Figures 6A et 6B montrent une version des Figures 4A et 4B comprenant une deuxième série de bandelettes, ces Figures 6A et 6B pouvant évidemment être combinées.Figures 6A and 6B show a version of Figures 4A and 4B including a second set of strips, which Figures 6A and 6B can obviously be combined.
La Figure 7 montre deux lamelles ayant chacune uniquement deux séries de bandelettes 7 reliant les crêtes. La distance entre deux séries de crêtes est choisie de sorte que les fentes d'une lamelle 1 ne superposent pas celles de la lamelle successive 2.Figure 7 shows two lamellae each having only two sets of strips 7 connecting the ridges. The distance between two series of peaks is chosen so that the slots of a lamella 1 do not overlap those of the successive lamella 2.
La figure 8 est une vue en perspective d'une lamelle de garnissage suivant l'invention. La lamelle 1 comprend en général au moins une découpe formant une bandelette 7 en forme de parallélépipède ABCD ayant au moins une des caractéristiques suivantes :Figure 8 is a perspective view of a packing strip according to the invention. The strip 1 generally comprises at least one cut forming a parallelepiped strip ABCD having at least one of the following characteristics:
- au moins un des bords AD ou BC a une direction inférieur à 20°, voire inférieure à 10° de la ligne de plus grande pente, cette ligne étant définie comme (définition à rajouter....) - un coté AB (ou CD) est un pli situé sur une crête 3 (ou une vallée 5) de la lamelle 1 faisant partie du garnissage ondulé croisé. Ce coté a la même inclinaison par rapport à l'horizontale que l'angle d'inclinaison δ des canaux (en général compris entre 45 et 60°) - le dernier coté CD est un bord obtenu par découpe et est positionné de manière à ce que le plan ABCD vienne en contact avec un autre élément de la lamelle 1 (par exemple uniquement la crête successive 3).at least one of the edges AD or BC has a direction less than 20 °, or even less than 10 ° of the line of greatest slope, this line being defined as (definition to be added ....) - one side AB (or CD) is a fold located on a crest 3 (or a valley 5) of the lamella 1 forming part of the crossed corrugated packing. This side has the same inclination with respect to the horizontal as the angle of inclination δ of the channels (generally between 45 and 60 °) the last side CD is an edge obtained by cutting and is positioned in such a way that the plane ABCD comes into contact with another element of the lamella 1 (for example only the successive ridge 3).
Pour éviter tout phénomène d'accumulation et d'apparition de gouttelettes sur l'extrémité CD pouvant engendrer un décrochage du liquide, il est envisageable que le bord CD soit confondu (aligné et en contact) avec une crête successive 3, comme illustré à la Figure 8 pour une lamelle 2. Pour cela il faut que la distance des droites passant par AB et CD soit égale au pas de l'onde L. Cette disposition s'applique évidemment aussi pour les bandelettes 9 contactant les vallées 5.To avoid any phenomenon of accumulation and appearance of droplets on the CD end may cause a stall of the liquid, it is conceivable that the CD edge is merged (aligned and in contact) with a successive ridge 3, as shown in FIG. Figure 8 for a plate 2. For this it is necessary that the distance of the straight lines passing through AB and CD is equal to the pitch of the wave L. This provision obviously applies also for the strips 9 contacting the valleys 5.
Alternativement, comme illustré dans la Figure 10, un plan 7 reliée avec une crête 3 d'une lamelle 1 peut contacter le plan 7A reliée avec une crête successive 3A de la même lamelle. Ainsi le plan intégré dans le garnissage ondulé croisé est réalisé à partir de deux parallélépipèdes : - ABCD (plan 7) qui serait lié à la lamelle 1 par le côté AB confondu avec la crête 3Alternatively, as shown in Figure 10, a plane 7 connected to a peak 3 of a lamella 1 can contact the plane 7A connected with a successive ridge 3A of the same lamella. Thus the plane integrated in the crossed corrugated packing is made from two parallelepipeds: ABCD (plane 7) which would be connected to the lamella 1 by the side AB coincides with the crest 3
- A'B'C'D' (plan 7A) qui serait lié à la lamelle 1 par le côté CD' confondu avec la crête 3A.- A'B'C'D '(plane 7A) which would be linked to the lamella 1 by the side CD' confused with the crest 3A.
La bandelette est donc constitué par deux plans 7,7A. La contrainte pour favoriser le passage du liquide d'une facette à l'autre est d'avoir une superposition et contact d'une partie de leur surface entre elles (ici représenté par le parallélogramme A1B11CD")The strip is constituted by two planes 7.7A. The constraint for promoting the passage of the liquid from one facet to the other is to have a superposition and contact of a part of their surface between them (here represented by the parallelogram A 1 B 11 CD ")
Pour cette configuration de la Figure 10 il est possible de réaliser ces deux plans non plus reliés aux crêtes ou aux vallées d'onde mais à une élévation quelconque des flancs pour réaliser un sectionnement de la veine gazeuseFor this configuration of Figure 10 it is possible to realize these two planes no longer connected to the peaks or valleys wave but at any elevation of the sidewalls to perform a sectioning of the gas stream
Les modules de garnissage selon l'invention peuvent bien sûr inclure d'autres dispositifs.The packing modules according to the invention can of course include other devices.
Des traitements de surface variés, par exemple :Various surface treatments, for example:
US 4296050 Sulzer 1977 Micro-ondulations transverses à l'écoulement du liquide pour l'étaler.US 4296050 Sulzer 1977 Microwaves transverse to the liquid flow for spreading.
EP 0190435 Sulzer 1985 Gaufrage non crevés en quinconce Des dispositifs pour éviter l'engorgement à l'interface entre corps de garnissages, tels que ceux décrits dans les brevets suivants :EP 0190435 Sulzer 1985 Non-staggered embossing in quincunx Devices to avoid clogging at the interface between packings, such as those described in the following patents:
Des essais expérimentaux ont prouvé que l'engorgement d'un garnissage intervient d'abord à l'interface entre les modules, à un endroit où le gaz est contraint à changer de direction selon un angle d'environ 90° pour passer d'un module à l'autre. Ainsi, on limite la capacité de la colonne, alors que la partie centrale des modules n'a pas encore atteint son point d'engorgement. Ce phénomène est analysé en termes d'engorgement de liquide dans la partie basse des modules au voisinage de l'interface : la perte de charge subie par le gaz au changement de direction provoque une accumulation de liquide dans la zone avoisinante. L'accumulation de liquide provoque un engorgement prématuré de la colonne. L'invention permet la fabrication économique de garnissage ondulé- croisé possédant de meilleures performances. On peut donc réduire le volume de garnissage utilisé pour traiter un débit donné sans perte d'efficacité, puisque la même quantité de métal utilisée pour un garnissage ondulé-croisé classique (sans fentes) est utilisée pour créer un garnissage plus performant. Utilisée dans le cadre de la distillation cryogénique de l'air, elle permet donc de réduire la taille des colonnes et des boîtes froides.Experimental tests have shown that the clogging of a lining first occurs at the interface between the modules, at a place where the gas is forced to change direction at an angle of about 90 ° to pass a module to another. Thus, it limits the capacity of the column, while the central part of the modules has not yet reached its point of congestion. This phenomenon is analyzed in terms of liquid clogging in the lower part of the modules in the vicinity of the interface: the pressure drop experienced by the gas at the change of direction causes an accumulation of liquid in the neighboring zone. The accumulation of liquid causes premature engorgement of the column. The invention allows economical manufacture of cross-corrugated packing having better performance. It is therefore possible to reduce the volume of lining used to treat a given flow without loss of efficiency, since the same amount of metal used for conventional criss-cross lining (without slots) is used to create a higher performance liner. used in the context of cryogenic distillation of air, it therefore reduces the size of columns and cold boxes.
L'invention permet une réduction des investissements sur la colonne de distillation. The invention allows a reduction of investments on the distillation column.

Claims

REVENDICATIONS
1. Elément de garnissage régulier destiné à des colonnes d'échange de matière et/ou de chaleur comprenant en alternance une pluralité de lamelles (1 ,2), chaque lamelle étant ondulée, de forme générale rectangulaire, les lamelles étant disposées les unes contre les autres, de sorte que les ondulations traversant une lamelles sont orientées à entre 50° et 100° des ondulations de la lamelle adjacente, ainsi formant une structure ondulée- croisée, au moins une bandelette (7 ; 7,7A ; 9) contactant à la fois au moins une première crête (3, 5) d'une lamelle et au moins une deuxième crête de la lamelle, la deuxième crête étant adjacente à la première crête caractérisé en ce que la ou chaque bandelette est découpée dans la lamelle , de manière à laisser une fente dans l'ondulation .1. Regular packing element for material exchange columns and / or heat alternately comprising a plurality of slats (1, 2), each slat being corrugated, of generally rectangular shape, the slats being arranged against each other the others, so that the corrugations passing through a lamellae are oriented at between 50 ° and 100 ° of the corrugations of the adjacent lamella, thus forming a corrugated-cross structure, at least one strip (7,7,7A; at least one first peak (3, 5) of a lamella and at least one second peak of the lamella, the second peak being adjacent to the first peak characterized in that the or each strip is cut in the lamella, way to leave a slit in the ripple.
2. Elément selon la revendication 1 dans lequel au moins une bandelette (7,9) découpée dans la lamelle de manière à laisser une fente dans l'ondulation contacte à la fois au moins une première vallée (3,5) d'une lamelle (1 ,2) et au moins une deuxième vallée de la lamelle, la deuxième vallée étant adjacente à la première vallée.2. Element according to claim 1 wherein at least one strip (7,9) cut in the lamella so as to leave a slot in the corrugation contacts both at least one first valley (3,5) of a lamella (1, 2) and at least one second valley of the lamella, the second valley being adjacent to the first valley.
3. Elément selon la revendication 1 ou 2 dans lequel les bandelettes (7 ; 7,7A ; 9) sont découpées dans la lamelle, laissant une fente dans l'ondulation de la même forme que la bandelette.3. Element according to claim 1 or 2 wherein the strips (7; 7,7A; 9) are cut in the lamella, leaving a slot in the corrugation of the same shape as the strip.
4. Elément selon l'une des revendications précédentes dans lequel les bandelettes (7 ; 7,7A ; 9) sont de forme triangulaire ou parallélépipédique.4. Element according to one of the preceding claims wherein the strips (7; 7.7A; 9) are triangular or parallelepiped shape.
5. Elément selon l'une des revendications 1 à 4 dans lequel une bandelette (7 ; 7,7A ; 9) est formée par deux éléments triangulaires ou parallélépipédiques, de préférence sensiblement identiques, un (7) rejoignant une crête d'une lamelle et un autre (7A) rejoignant la crête adjacente, les deux éléments se rejoignant entre deux crêtes. 5. Element according to one of claims 1 to 4 wherein a strip (7; 7.7A; 9) is formed by two triangular or parallelepipedic elements, preferably substantially identical, one (7) joining a ridge of a lamella and another (7A) joining the adjacent ridge, the two elements joining between two ridges.
6. Elément selon l'une des revendications 1 à 5 dans lequel les bandelettes (7 ; 7,7A ; 9) s'étendent à un angle d'entre 10° et 60° aux crêtes (aux vallées) de la lamelle.6. Element according to one of claims 1 to 5 wherein the strips (7; 7,7A; 9) extend at an angle of between 10 ° and 60 ° to the peaks (valleys) of the lamella.
7. Elément selon l'une des revendications 1 à 6 dans lequel la bandelette (7 ; 7,7A ; 9) est de forme allongée, de préférence plate, un côté de la bandelette étant attaché à une crête (une vallée).7. Element according to one of claims 1 to 6 wherein the strip (7; 7.7A; 9) is elongated, preferably flat, one side of the strip being attached to a ridge (a valley).
8. Elément selon l'une des revendications 1 à 7 dans lequel la bandelette (7 ; 7,7A ; 9) s'étend juste au-delà de la crête adjacente.8. Element according to one of claims 1 to 7 wherein the strip (7; 7.7A; 9) extends just beyond the adjacent peak.
9. Elément selon l'une des revendications 1 à 7 dans un côté opposé de la bandelette (7 ; 7,7A ; 9), étant contiguë avec la crête (la vallée) adjacente.9. Element according to one of claims 1 to 7 in an opposite side of the strip (7,7,7A; 9), being contiguous with the adjacent ridge (valley).
10. Elément selon l'une des revendications précédentes dans lequel la longueur de la bandelette (7 ; 7,7A ; 9) est supérieure à la longueur d'onde de la lamelle, de préférence au moins deux fois supérieure à la longueur d'onde de la lamelle. 10. Element according to one of the preceding claims wherein the length of the strip (7; 7.7A; 9) is greater than the wavelength of the lamella, preferably at least twice the length of the strip. wave of the coverslip.
EP09768194A 2008-11-24 2009-11-16 Corrugated criss-crossing packing and column including such a packing Withdrawn EP2367626A1 (en)

Applications Claiming Priority (2)

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FR0857962A FR2938776A1 (en) 2008-11-24 2008-11-24 CROSS-CROSSOVER TRIM AND COLUMN INCORPORATING SUCH A TRIM
PCT/FR2009/052187 WO2010058115A1 (en) 2008-11-24 2009-11-16 Corrugated criss-crossing packing and column including such a packing

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JP2012509757A (en) 2012-04-26
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US20110226360A1 (en) 2011-09-22
WO2010058115A1 (en) 2010-05-27

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