WO2001076730A1 - Grille for maintaining a catalyst in an array of plates of a catalytic reactor - Google Patents

Grille for maintaining a catalyst in an array of plates of a catalytic reactor Download PDF

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Publication number
WO2001076730A1
WO2001076730A1 PCT/FR2001/000588 FR0100588W WO0176730A1 WO 2001076730 A1 WO2001076730 A1 WO 2001076730A1 FR 0100588 W FR0100588 W FR 0100588W WO 0176730 A1 WO0176730 A1 WO 0176730A1
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WO
WIPO (PCT)
Prior art keywords
plates
catalyst
circuit
grid
bundle
Prior art date
Application number
PCT/FR2001/000588
Other languages
French (fr)
Inventor
Sylvain Benezech
Original Assignee
Packinox
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Filing date
Publication date
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Publication of WO2001076730A1 publication Critical patent/WO2001076730A1/en

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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
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
    • 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
    • B01J19/24—Stationary reactors without moving elements inside
    • B01J19/248—Reactors comprising multiple separated flow channels
    • B01J19/249—Plate-type reactors
    • 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
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/008—Details of the reactor or of the particulate material; Processes to increase or to retard the rate of reaction
    • 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
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
    • B01J8/0285—Heating or cooling the reactor
    • 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
    • F28D9/0062—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 spaced plates with inserted elements
    • 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
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/02—Processes carried out in the presence of solid particles; Reactors therefor with stationary particles
    • B01J2208/021—Processes carried out in the presence of solid particles; Reactors therefor with stationary particles comprising a plurality of beds with flow of reactants in parallel
    • B01J2208/022—Plate-type reactors filled with granular catalyst
    • 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
    • B01J2219/24—Stationary reactors without moving elements inside
    • B01J2219/2401—Reactors comprising multiple separate flow channels
    • B01J2219/245—Plate-type reactors
    • B01J2219/2451—Geometry of the reactor
    • B01J2219/2453—Plates arranged in parallel
    • 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
    • B01J2219/24—Stationary reactors without moving elements inside
    • B01J2219/2401—Reactors comprising multiple separate flow channels
    • B01J2219/245—Plate-type reactors
    • B01J2219/2451—Geometry of the reactor
    • B01J2219/2456—Geometry of the plates
    • B01J2219/246—Perforated plates
    • 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
    • B01J2219/24—Stationary reactors without moving elements inside
    • B01J2219/2401—Reactors comprising multiple separate flow channels
    • B01J2219/245—Plate-type reactors
    • B01J2219/2476—Construction materials
    • B01J2219/2477—Construction materials of the catalysts
    • B01J2219/2481—Catalysts in granular from between plates
    • 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
    • B01J2219/24—Stationary reactors without moving elements inside
    • B01J2219/2401—Reactors comprising multiple separate flow channels
    • B01J2219/245—Plate-type reactors
    • B01J2219/2491—Other constructional details
    • B01J2219/2498—Additional structures inserted in the channels, e.g. plates, catalyst holding meshes
    • 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
    • B01J2219/32466—Composition or microstructure of the elements comprising catalytically active material
    • 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
    • B01J2219/32466—Composition or microstructure of the elements comprising catalytically active material
    • B01J2219/32475—Composition or microstructure of the elements comprising catalytically active material involving heat exchange

Definitions

  • the present invention relates to a grid for holding a catalyst in a plate bundle of a catalytic reactor and a plate bundle provided with such a grid.
  • the main fluid circulates in these tubes inside which the reaction takes place and the cooling fluid if this reaction is exothermic or the heat transfer fluid if said reaction is endothermic circulates outside of said tubes, between them and the inner wall of the enclosure.
  • Catalytic plate reactors which comprise a bundle of plates delimiting a first circuit for circulation of a reactive fluid and a second circuit for circulation of a cooling fluid or a heat-transfer fluid, the two circuits circulating against -current or cross-currents in the plate bundle.
  • the reactive fluid circuit includes a catalyst capable of promoting the catalytic reaction and this circuit also includes means for holding this catalyst in the channels of said circuit.
  • the means for holding the catalyst are formed by grids extending over the entire width of the channels of the reactive fluid circuit and each having openings smaller than the size of the grains forming the catalyst.
  • These grids must be able to withstand all mechanical stresses such as the weight of the catalyst, the variations in spacing between two plates of the bundle of plates as well as the expansion of the plates of said bundle by thermal effect.
  • these grids must also resist the compressive and tensile forces at the level of the fixing zones on the plates of the plate bundle and have small openings to avoid the passage of the catalyst, but sufficiently wide to allow the reactive fluid to pass. without generating too much pressure drop.
  • the grids have the shape of a U comprising three flat and rigid branches.
  • this type of grids does not allow to correctly overcome the manufacturing and mounting tolerances between two plates of the bundle of plates as well as the expansion of these plates by thermal effect, which poses problems in the areas of attachment of said grid between the plates of the plate bundle.
  • the object of the invention is to propose a grid for holding a catalyst which avoids the drawbacks mentioned above.
  • the subject of the invention is therefore a grid for holding a catalyst in a bundle of plates of a catalytic reactor, said bundle of plates being formed by a stack of heat exchange plates delimiting between them circuits for circulating fluids. and at least one of which is filled with said catalyst held at each end of the circuit by said grid, characterized in that it is formed by at least one flexible plate of width greater than the space between two adjacent plates of the circuit containing said catalyst and folded according to a radius of curvature substantially equal to or greater than half of said space so that the branches of the folded plate are applied by elasticity to the plates of said circuit.
  • the central part of the folded plate is directed towards the inside of the circuit containing said catalyst, the radius of curvature of said plate is continuous,
  • the central part of the folded plate has slots for the passage of the fluid
  • the slots extend transversely or longitudinally, - the branches of the folded plate are fixed to the plates of said circuit by welding.
  • the invention also relates to a bundle of plates for a catalytic reactor, of the type comprising a stack of heat exchange plates delimiting between them circuits for circulating fluids and at least one of which is filled with a catalyst, characterized in that the catalyst is held at each end of the circuit by a grid as previously mentioned.
  • FIG. 1 is a schematic perspective view, partially broken away, of one end of a bundle of plates of a catalytic reactor, in accordance with the invention
  • FIG. 2 and 3 are schematic perspective views respectively of the grid before folding and of the grid after folding
  • FIG. 4 and 5 are schematic cross-sectional views showing the mounting of a grid in a bundle of plates of a catalytic reactor.
  • Fig. 1 there is shown schematically a bundle of plates designated as a whole by the reference 1 and intended to be placed in a sealed enclosure, not shown, to form a catalytic reactor.
  • the bundle of plates 1 of generally parallelepipedal shape is constituted by a stack of plates 2 parallel to each other and delimiting a multitude of channels which extend longitudinally from one end to the other of the bundle of plates 1.
  • the plates 2 for example made of stainless steel, are held together by suitable means and have edges with a smooth surface and a central part provided with corrugations, not shown, by which they are in contact with one another. the others and by which they delimit said channels.
  • the plates 2 define between them a first series of channels 10A forming a circulation circuit for a reactive fluid A and a second series of channels 10B forming a circulation circuit for a heat transfer fluid B.
  • the channels 10A are distributed over every other channel in the bundle of plates 1 and the fluid A circulates in these channels 10A at cross currents relative to the heat transfer fluid B.
  • channels 10A for circulation of the reactive fluid A contain particles 5 of catalyst so as to cause the desired reaction during the passage of the reactive fluid A.
  • the catalyst particles 5 are held at each end of the channels 10A by a grid 20 which extends over the entire length of the end of said channels 10A of the plate bundle 1.
  • each grid 20 is formed from at least one plate 21 preferably of flexible material and of width "I" greater than the space "e” between two adjacent plates of the circuit formed by the channels 10A containing the catalyst particles 5.
  • the plate 21 is folded according to a radius of curvature "r" whether continuous or not so as to delimit a curved central part 21a and two branches 21b.
  • the radius of curvature "r” is substantially equal to or greater than half the space “e” between two adjacent plates 2 of the circuit containing the catalyst particles 5.
  • the central part 21a of the plate 21 has transverse slots 22 for the passage of the reactive fluid A and distributed, in the embodiment shown in the figures, in two parallel rows.
  • the central part 21a of the plate 21 can comprise a single row of transverse slots 22.
  • the slots 22 extend longitudinally.
  • These slots 22 may or may not be interrupted by a ligament and are sufficiently fine to not allow the catalyst particles 5 to escape through said slots, but they are wide enough to allow the reactive fluid A to pass without generating too much pressure losses.
  • the folded plate 21 is positioned opposite the end of the channel 10A to be closed so that the central part 21a of said plate 21 is directed towards the interior of the circuit containing the particles 5 of catalyst.
  • This folded plate 21 is introduced into the corresponding channel 10A, as shown in FIG. 5.
  • the central part 21a of the plate 21 is therefore oriented towards the inside of the bundle of plates 1 and, after the positioning of this plate 21, the branches 21b are fixed to the adjacent plates 2 by welding.
  • This welding can be carried out by the TIG method, by points or continuously and with or without filler metal, or even by points generated by capacitor discharge.
  • Each end of the channels 10A of the circulation circuit of the reactive fluid A is thus provided with a grid 20 so as to maintain the particles 5 of catalyst in each of said channels 10A.
  • the grid 20 according to the invention has the advantage, due to its shape, of being able to withstand all mechanical stresses such as the weight of the catalyst, the variations in spacing between two adjacent plates of the bundle of plates and also the expansions by thermal effect of these plates.
  • the grids according to the invention also have the advantage of being able to recover the manufacturing tolerances at the level of the welding zone and this thanks to the elasticity effect of the branches of the grid.
  • the grid according to the invention is easily produced by folding or stretching, which makes it possible to be able to produce a grid closing off the entire end of each channel of the corresponding circuit which, in certain embodiments, may have a length of the order of five meters.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Abstract

The invention concerns a grille (20) for maintaining a catalyst in an array of plates (1) of a catalytic reactor, said array of plates (1) being formed by a stack of heat-exchanging plates (2) defining between them fluid flow circuits (10,A, 10B) and one of which at least is filled with the catalyst (5) maintained at each end of the circuit by said grille (20). Said grille (20) is formed by at least a flexible plate with greater width than the space between two adjacent plates of the circuit (10A) containing said catalyst and bent along a radius of curvature substantially equal or greater than half of said space between two adjacent plates (2).

Description

Grille de maintien d'un catalyseur dans un faisceau de plaques d'un réacteur catalytique.Grid for holding a catalyst in a bundle of plates of a catalytic reactor.
La présente invention concerne une grille de maintien d'un catalyseur dans un faisceau de plaques d'un réacteur catalytique et un faisceau de plaques muni d'une telle grille.The present invention relates to a grid for holding a catalyst in a plate bundle of a catalytic reactor and a plate bundle provided with such a grid.
Dans de nombreuses industries, comme par exemple les indus- tries pétrochimiques et chimiques, on utilise des procédés de traitement qui mettent en œuvre des réacteurs dans lesquels se produisent, entre un fluide réactif et un catalyseur, des réactions chimiques qui sont en général des réactions catalytiques ayant lieu dans des conditions données de températures et de pressions. Pour cela, on utilise des réacteurs catalytiques formés par une enceinte étanche à l'intérieure de laquelle sont disposés des tubes parallèles remplis de catalyseurs.In many industries, such as the petrochemical and chemical industries, treatment processes are used which employ reactors in which chemical reactions, which are generally reactions, take place between a reactive fluid and a catalyst. catalysts taking place under given conditions of temperature and pressure. For this, we use catalytic reactors formed by a sealed enclosure inside which are arranged parallel tubes filled with catalysts.
Le fluide principal circule dans ces tubes à l'intérieur desquels se produit la réaction et le fluide de refroidissement si cette réaction est exothermi- que ou le fluide caloporteur si ladite réaction est endothermique circule à l'extérieur desdits tubes, entre ceux-ci et la paroi interne de l'enceinte.The main fluid circulates in these tubes inside which the reaction takes place and the cooling fluid if this reaction is exothermic or the heat transfer fluid if said reaction is endothermic circulates outside of said tubes, between them and the inner wall of the enclosure.
Le principal inconvénient de ces réacteurs tabulaires réside dans leurs dimensions car, pour de grosses unités, le nombre de tubes devient rapidement très important et le diamètre de l'appareil excessif. On connaît également des réacteurs catalytiques à plaques qui comprennent un faisceau de plaques délimitant un premier circuit de circulation d'un fluide réactif et un second circuit de circulation d'un fluide de refroidissement ou d'un fluide caloporteur, les deux circuits circulant à contre-courant ou à courants croisés dans le faisceau de plaques. Le circuit du fluide réactif comporte un catalyseur apte à favoriser la réaction catalytique et ce circuit comporte également des moyens de maintien de ce catalyseur dans les canaux dudit circuit.The main drawback of these tabular reactors lies in their dimensions because, for large units, the number of tubes quickly becomes very large and the diameter of the device excessive. Catalytic plate reactors are also known which comprise a bundle of plates delimiting a first circuit for circulation of a reactive fluid and a second circuit for circulation of a cooling fluid or a heat-transfer fluid, the two circuits circulating against -current or cross-currents in the plate bundle. The reactive fluid circuit includes a catalyst capable of promoting the catalytic reaction and this circuit also includes means for holding this catalyst in the channels of said circuit.
Généralement, les moyens de maintien du catalyseur sont formés par des grilles s'étendant sur toute la largeur des canaux du circuit du fluide réactif et possédant chacune des ouvertures inférieures à la taille des grains formant le catalyseur. Ces grilles doivent pouvoir résister à toutes les sollicitations mécaniques telles que le poids du catalyseur, les variations d'espacement entre deux plaques du faisceau de plaques ainsi qu'aux dilatations des plaques dudit faisceau par effet thermique. Enfin, ces grilles doivent aussi résister aux efforts de compression et de traction au niveau des zones de fixation sur les plaques du faisceau de plaques et avoir des ouvertures de faible dimension pour éviter le passage du catalyseur, mais suffisamment larges pour laisser passer le fluide réactif sans générer trop de pertes de charge. Jusqu'à présent, les grilles ont la forme d'un U comportant trois branches planes et rigides.Generally, the means for holding the catalyst are formed by grids extending over the entire width of the channels of the reactive fluid circuit and each having openings smaller than the size of the grains forming the catalyst. These grids must be able to withstand all mechanical stresses such as the weight of the catalyst, the variations in spacing between two plates of the bundle of plates as well as the expansion of the plates of said bundle by thermal effect. Finally, these grids must also resist the compressive and tensile forces at the level of the fixing zones on the plates of the plate bundle and have small openings to avoid the passage of the catalyst, but sufficiently wide to allow the reactive fluid to pass. without generating too much pressure drop. Until now, the grids have the shape of a U comprising three flat and rigid branches.
Compte tenu de cette forme et de la rigidité des branches latérales, ce type de grilles ne permet pas de s'affranchir correctement des tolérances de fabrication et de montage entre deux plaques du faisceau de plaques ainsi que des dilatations de ces plaques par effet thermique, ce qui pose des problèmes au niveau des zones de fixation de ladite grille entre les plaques du faisceau de plaques.Given this shape and the rigidity of the lateral branches, this type of grids does not allow to correctly overcome the manufacturing and mounting tolerances between two plates of the bundle of plates as well as the expansion of these plates by thermal effect, which poses problems in the areas of attachment of said grid between the plates of the plate bundle.
L'invention a pour but de proposer une grille de maintien d'un catalyseur qui évite les inconvénients précédemment mentionnés. L'invention a donc pour objet une grille de maintien d'un catalyseur dans un faisceau de plaques d'un réacteur catalytique, ledit faisceau de plaques étant formé par un empilement de plaques d'échange thermique délimitant entre elles des circuits de circulation de fluides et dont au moins un est rempli dudit catalyseur maintenu à chaque extrémité du circuit par ladite grille, ca- ractérisée en ce qu'elle est formée par au moins une plaque souple de largeur supérieure à l'espace entre deux plaques adjacentes du circuit contenant ledit catalyseur et pliée selon un rayon de courbure sensiblement égal ou supérieur à la moitié dudit espace pour que les branches de la plaque pliée s'appliquent par élasticité sur les plaques dudit circuit. Selon d'autres caractéristiques de l'invention :The object of the invention is to propose a grid for holding a catalyst which avoids the drawbacks mentioned above. The subject of the invention is therefore a grid for holding a catalyst in a bundle of plates of a catalytic reactor, said bundle of plates being formed by a stack of heat exchange plates delimiting between them circuits for circulating fluids. and at least one of which is filled with said catalyst held at each end of the circuit by said grid, characterized in that it is formed by at least one flexible plate of width greater than the space between two adjacent plates of the circuit containing said catalyst and folded according to a radius of curvature substantially equal to or greater than half of said space so that the branches of the folded plate are applied by elasticity to the plates of said circuit. According to other characteristics of the invention:
- la partie centrale de la plaque pliée est dirigée vers l'intérieur du circuit contenant ledit catalyseur, - le rayon de courbure de ladite plaque est continu,the central part of the folded plate is directed towards the inside of the circuit containing said catalyst, the radius of curvature of said plate is continuous,
- la partie centrale de la plaque pliée comporte des fentes pour le passage du fluide,the central part of the folded plate has slots for the passage of the fluid,
- les fentes s'étendent transversalement ou longitudinalement, - les branches de la plaque pliée sont fixées sur les plaques dudit circuit par soudage.- The slots extend transversely or longitudinally, - the branches of the folded plate are fixed to the plates of said circuit by welding.
L'invention a également pour objet un faisceau de plaques pour un réacteur catalytique, du type comprenant un empilement de plaques d'échange thermique délimitant entre elles des circuits de circulation de fluides et dont au moins un est rempli d'un catalyseur, caractérisé en ce que le catalyseur est maintenu à chaque extrémité du circuit par une grille telle que précédemment mentionnée.The invention also relates to a bundle of plates for a catalytic reactor, of the type comprising a stack of heat exchange plates delimiting between them circuits for circulating fluids and at least one of which is filled with a catalyst, characterized in that the catalyst is held at each end of the circuit by a grid as previously mentioned.
L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée à titre d'exemple et faite en référence aux dessins annexés, sur lesquels :The invention will be better understood on reading the description which follows, given by way of example and made with reference to the appended drawings, in which:
- la Fig. 1 est une vue schématique en perspective et partiellement arrachée d'une extrémité d'un faisceau de plaques d'un réacteur catalytique, conforme à l'invention,- Fig. 1 is a schematic perspective view, partially broken away, of one end of a bundle of plates of a catalytic reactor, in accordance with the invention,
- les Figs. 2 et 3 sont des vues schématiques en perspective res- pectivement de la grille avant pliage et de la grille après pliage,- Figs. 2 and 3 are schematic perspective views respectively of the grid before folding and of the grid after folding,
- les Figs. 4 et 5 sont des vues schématiques en coupe transversale montrant le montage d'une grille dans un faisceau de plaques d'un réacteur catalytique.- Figs. 4 and 5 are schematic cross-sectional views showing the mounting of a grid in a bundle of plates of a catalytic reactor.
Sur la Fig. 1 , on a représenté schématiquement un faisceau de plaques désigné dans son ensemble par la référence 1 et destiné à être placé dans une enceinte étanche, non représentée, pour former un réacteur catalytique.In Fig. 1, there is shown schematically a bundle of plates designated as a whole by the reference 1 and intended to be placed in a sealed enclosure, not shown, to form a catalytic reactor.
Le faisceau de plaques 1 de forme générale parallélépipèdique est constituté par un empilement de plaques 2 parallèles les unes aux autres et délimitant une multitude de canaux qui s'étendent longitudinalement d'une extrémité à l'autre du faisceau de plaques 1. De manière classique, les plaques 2, par exemple en acier inoxydable, sont maintenues entre elles par des moyens appropriés et comportent des bords à surface lisse et une partie centrale munie d'ondulations, non représentées, par lesquelles elles sont en contact les unes sur les autres et par lesquelles elles délimitent lesdits canaux.The bundle of plates 1 of generally parallelepipedal shape is constituted by a stack of plates 2 parallel to each other and delimiting a multitude of channels which extend longitudinally from one end to the other of the bundle of plates 1. Conventionally, the plates 2, for example made of stainless steel, are held together by suitable means and have edges with a smooth surface and a central part provided with corrugations, not shown, by which they are in contact with one another. the others and by which they delimit said channels.
Dans l'exemple de réalisation représenté à la Fig. 1 , les plaques 2 délimitent entre elles une première série de canaux 10A formant un circuit de circulation d'un fluide réactif A et une seconde série de canaux 10B formant un circuit de circulation d'un fluide caloporteur B. Les canaux 10A sont répartis sur un canal sur deux dans le faisceau de plaques 1 et le fluide A circule dans ces canaux 10A à courants croisés par rapport au fluide caloporteur B.In the exemplary embodiment shown in FIG. 1, the plates 2 define between them a first series of channels 10A forming a circulation circuit for a reactive fluid A and a second series of channels 10B forming a circulation circuit for a heat transfer fluid B. The channels 10A are distributed over every other channel in the bundle of plates 1 and the fluid A circulates in these channels 10A at cross currents relative to the heat transfer fluid B.
Par ailleurs, les canaux 10A de circulation du fluide réactif A contiennent des particules 5 de catalyseur de façon à provoquer la réaction dési- rée lors du passage du fluide réactif A.Furthermore, the channels 10A for circulation of the reactive fluid A contain particles 5 of catalyst so as to cause the desired reaction during the passage of the reactive fluid A.
Les particules 5 de catalyseur sont maintenues à chaque extrémité des canaux 10A par une grille 20 qui s'étend sur toute la longueur de l'extrémité desdits canaux 10A du faisceau de plaques 1.The catalyst particles 5 are held at each end of the channels 10A by a grid 20 which extends over the entire length of the end of said channels 10A of the plate bundle 1.
Ainsi que représenté sur les Figs. 2 et 3, chaque grille 20 est formée à partir d'au moins une plaque 21 de préférence en matériau souple et de largeur "I" supérieure à l'espace "e" entre deux plaques adjacentes du circuit formé par les canaux 10A contenant les particules 5 de catalyseur.As shown in Figs. 2 and 3, each grid 20 is formed from at least one plate 21 preferably of flexible material and of width "I" greater than the space "e" between two adjacent plates of the circuit formed by the channels 10A containing the catalyst particles 5.
La plaque 21 est pliée selon un rayon de courbure "r" continu ou non de façon à délimiter une partie centrale courbe 21a et deux branches 21b. Le rayon de courbure "r" est sensiblement égal ou supérieur à la moitié de l'espace "e" entre deux plaques 2 adjacentes du circuit contenant les particules 5 de catalyseur.The plate 21 is folded according to a radius of curvature "r" whether continuous or not so as to delimit a curved central part 21a and two branches 21b. The radius of curvature "r" is substantially equal to or greater than half the space "e" between two adjacent plates 2 of the circuit containing the catalyst particles 5.
La partie centrale 21a de la plaque 21 comporte des fentes 22 transversales pour le passage du fluide réactif A et réparties, dans l'exemple de réalisation représenté sur les figures, selon deux rangées parallèles.The central part 21a of the plate 21 has transverse slots 22 for the passage of the reactive fluid A and distributed, in the embodiment shown in the figures, in two parallel rows.
Selon une variante, la partie centrale 21a de la plaque 21 peut comporter une seule rangée de fentes 22 transversales. Selon une autre variante, les fentes 22 s'étendent longitudinalement.According to a variant, the central part 21a of the plate 21 can comprise a single row of transverse slots 22. According to another variant, the slots 22 extend longitudinally.
Ces fentes 22 peuvent être interrompues par un ligament ou non et sont suffisamment fines pour ne pas laisser la possibilité aux particules 5 de catalyseur de s'échapper par lesdites fentes, mais elles sont suffisamment larges pour laisser passer le fluide réactif A sans générer trop de pertes de charge.These slots 22 may or may not be interrupted by a ligament and are sufficiently fine to not allow the catalyst particles 5 to escape through said slots, but they are wide enough to allow the reactive fluid A to pass without generating too much pressure losses.
Comme représenté sur les Figs. 4 et 5, la plaque 21 pliée est positionnée en face de l'extrémité du canal 10A à obturer pour que la partie centrale 21a de ladite plaque 21 soit dirigée vers l'intérieur du circuit contenant les particules 5 de catalyseur.As shown in Figs. 4 and 5, the folded plate 21 is positioned opposite the end of the channel 10A to be closed so that the central part 21a of said plate 21 is directed towards the interior of the circuit containing the particles 5 of catalyst.
Cette plaque 21 pliée est introduite dans le canal 10A correspondant, ainsi que représenté à la Fig. 5.This folded plate 21 is introduced into the corresponding channel 10A, as shown in FIG. 5.
Du fait du rayon de courbure "r" qui est sensiblement égal ou supérieur à la moitié de l'espace "e" entre deux plaques 2 adjacentes, les branches 21b de la plaque 21 pliée s'appliquent par élasticité sur lesdites plaques 2.Due to the radius of curvature "r" which is substantially equal to or greater than half the space "e" between two adjacent plates 2, the branches 21b of the folded plate 21 are applied by elasticity to said plates 2.
La partie centrale 21a de la plaque 21 est donc orientée vers l'intérieur du faisceau de plaques 1 et, après la mise en place de cette plaque 21 , les branches 21b sont fixées sur les plaques 2 contiguës par soudage.The central part 21a of the plate 21 is therefore oriented towards the inside of the bundle of plates 1 and, after the positioning of this plate 21, the branches 21b are fixed to the adjacent plates 2 by welding.
Ce soudage peut être réalisé par la méthode TIG, par points ou en continu et avec ou sans métal d'apport, ou encore par points générés par décharge de condensateur.This welding can be carried out by the TIG method, by points or continuously and with or without filler metal, or even by points generated by capacitor discharge.
Chaque extrémité des canaux 10A du circuit de circulation du fluide réactif A est ainsi munie d'une grille 20 de façon à maintenir les particules 5 de catalyseur dans chacun desdits canaux 10A. La grille 20 selon l'invention présente l'avantage, du fait de sa forme, de pouvoir résister à toutes les sollicitations mécaniques telles que le poids du catalyseur, les variations d'espacement entre deux plaques adjacentes du faisceau de plaques et également aux dilatations par effet thermique de ces plaques. Les grilles selon l'invention présentent aussi comme avantage de pouvoir récupérer les tolérances de fabrication au niveau de la zone de soudage et cela grâce à l'effet d'élasticité des branches de la grille. Enfin, la grille selon l'invention est facilement réalisable par pliage ou par étirage ce qui permet de pouvoir réaliser une grille obturant la totalité de l'extrémité de chaque canal du circuit correspondant qui, dans certains modes de réalisation, peut avoir une longueur de l'ordre de cinq mètres. Each end of the channels 10A of the circulation circuit of the reactive fluid A is thus provided with a grid 20 so as to maintain the particles 5 of catalyst in each of said channels 10A. The grid 20 according to the invention has the advantage, due to its shape, of being able to withstand all mechanical stresses such as the weight of the catalyst, the variations in spacing between two adjacent plates of the bundle of plates and also the expansions by thermal effect of these plates. The grids according to the invention also have the advantage of being able to recover the manufacturing tolerances at the level of the welding zone and this thanks to the elasticity effect of the branches of the grid. Finally, the grid according to the invention is easily produced by folding or stretching, which makes it possible to be able to produce a grid closing off the entire end of each channel of the corresponding circuit which, in certain embodiments, may have a length of the order of five meters.

Claims

REVENDICATIONS
1. Grille de maintien d'un catalyseur (5) dans un faisceau de plaques (1) d'un réacteur catalytique, ledit faisceau de plaques (1) étant formé par une empilement de plaques (2) d'échange thermique délimitant entre elles des circuits (10A ; 10B) de circulation de fluides et dont au moins un (10A) est rempli du catalyseur (5) maintenu à chaque extrémité du circuit (10A) par ladite grille (20), caractérisée en ce qu'elle est formée par au moins une plaque (21) souple de largeur supérieure à l'espace entre deux plaques (2) adjacentes du circuit (10A) contenant le catalyseur (5) et pliée selon un rayon de courbure sensible- ment égal ou supérieur à la moitié dudit espace pour que les branches (21 b) de la plaque (21) pliée s'appliquent par élasticité sur les plaques (2) dudit circuit (10A).1. Grid for holding a catalyst (5) in a bundle of plates (1) of a catalytic reactor, said bundle of plates (1) being formed by a stack of plates (2) heat exchange delimiting between them circuits (10A; 10B) for circulating fluids and at least one (10A) of which is filled with catalyst (5) held at each end of the circuit (10A) by said grid (20), characterized in that it is formed by at least one flexible plate (21) of width greater than the space between two adjacent plates (2) of the circuit (10A) containing the catalyst (5) and folded according to a radius of curvature substantially equal to or greater than half of said space so that the branches (21 b) of the folded plate (21) are applied by elasticity to the plates (2) of said circuit (10A).
2. Grille selon la revendication 1 , caractérisée en ce que la partie centrale (21 a) de la plaque (21) pliée est dirigée vers l'intérieur du circuit (10A) 5 contenant ledit catalyseur (5).2. Grid according to claim 1, characterized in that the central part (21 a) of the folded plate (21) is directed towards the inside of the circuit (10A) 5 containing said catalyst (5).
3. Grille selon la revendication 1 , caractérisée en ce que le rayon de courbure de ladite plaque (21) est continu.3. Grid according to claim 1, characterized in that the radius of curvature of said plate (21) is continuous.
4. Grille selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la partie centrale (21a) de la plaque (21) pliée comporte des o fentes (22) pour le passage du fluide.4. Grid according to any one of claims 1 to 3, characterized in that the central part (21a) of the folded plate (21) has o slots (22) for the passage of the fluid.
5. Grille selon la revendication 4, caractérisée en ce que les fentes (22) s'étendent transversalement ou longitudinalement.5. Grid according to claim 4, characterized in that the slots (22) extend transversely or longitudinally.
6. Grille selon la revendication 1 , caractérisée en ce que les branches (21b) de la plaque (21) pliée sont fixées sur les plaques (2) dudit circuit 5 (10A) par soudage.6. Grid according to claim 1, characterized in that the branches (21b) of the folded plate (21) are fixed to the plates (2) of said circuit 5 (10A) by welding.
7. Faisceau de plaques pour un réacteur catalytique, du type comprenant un empilement de plaques (2) d'échange thermique délimitant entre elles des circuits (10A ; 10B) de circulation de fluide et dont au moins un (10A) est rempli d'un catalyseur (5), caractérisé en ce que le catalyseur (5) est mainte- 0 nu à chaque extrémité du circuit (10A) par une grille (20) selon l'une quelconque des revendications 1 à 6. 7. A bundle of plates for a catalytic reactor, of the type comprising a stack of heat exchange plates (2) delimiting between them circuits (10A; 10B) for circulation of fluid and of which at least one (10A) is filled with a catalyst (5), characterized in that the catalyst (5) is maintained at each end of the circuit (10A) by a grid (20) according to any one of claims 1 to 6.
PCT/FR2001/000588 2000-04-11 2001-02-28 Grille for maintaining a catalyst in an array of plates of a catalytic reactor WO2001076730A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR00/04656 2000-04-11
FR0004656A FR2807337B1 (en) 2000-04-11 2000-04-11 HOLDING GRID OF A CATALYST IN A PLATE BEAM OF A CATALYTIC REACTOR

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WO2001076730A1 true WO2001076730A1 (en) 2001-10-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007129108A1 (en) * 2006-05-08 2007-11-15 Compactgtl Plc Catalytic reactor comprising first and secondary flow channels arranged alternately
US8262754B2 (en) 2006-05-08 2012-09-11 Compactgtl Plc Catalyst structure for a rapid reaction

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Publication number Priority date Publication date Assignee Title
US1705471A (en) * 1923-06-13 1929-03-19 Georges Jules Prat Heat interchanger of the plate type
US3255816A (en) * 1962-01-02 1966-06-14 Rosenblad Corp Plate type heat exchanger
US4966231A (en) * 1989-03-15 1990-10-30 Rolls-Royce Plc Heat exchanger construction
EP0428265A1 (en) * 1989-11-13 1991-05-22 Koch Engineering Company Inc Process and structure for effecting catalytic reactions in distillation structure
FR2707186A1 (en) * 1993-07-05 1995-01-13 Packinox Sa Isothermal catalytic reactor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1705471A (en) * 1923-06-13 1929-03-19 Georges Jules Prat Heat interchanger of the plate type
US3255816A (en) * 1962-01-02 1966-06-14 Rosenblad Corp Plate type heat exchanger
US4966231A (en) * 1989-03-15 1990-10-30 Rolls-Royce Plc Heat exchanger construction
EP0428265A1 (en) * 1989-11-13 1991-05-22 Koch Engineering Company Inc Process and structure for effecting catalytic reactions in distillation structure
FR2707186A1 (en) * 1993-07-05 1995-01-13 Packinox Sa Isothermal catalytic reactor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007129108A1 (en) * 2006-05-08 2007-11-15 Compactgtl Plc Catalytic reactor comprising first and secondary flow channels arranged alternately
EA014205B1 (en) * 2006-05-08 2010-10-29 КОМПАКТДЖТЛ ПиЭлСи Catalytic reactor comprising first and secondary flow channels arranged alternately
US7897119B2 (en) 2006-05-08 2011-03-01 Compactgtl Plc Catalytic reactor
AU2007246839B2 (en) * 2006-05-08 2011-10-20 Compactgtl Plc Catalytic reactor comprising first and secondary flow channels arranged alternately
CN101437607B (en) * 2006-05-08 2011-11-16 康帕克特Gtl有限公司 Catalytic reactor comprising first and secondary flow channels arranged alternately
US8262754B2 (en) 2006-05-08 2012-09-11 Compactgtl Plc Catalyst structure for a rapid reaction

Also Published As

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FR2807337B1 (en) 2002-07-05
FR2807337A1 (en) 2001-10-12

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