EP0754911B1 - Infrared rays emitter with a catalytic burner - Google Patents

Infrared rays emitter with a catalytic burner Download PDF

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Publication number
EP0754911B1
EP0754911B1 EP96420083A EP96420083A EP0754911B1 EP 0754911 B1 EP0754911 B1 EP 0754911B1 EP 96420083 A EP96420083 A EP 96420083A EP 96420083 A EP96420083 A EP 96420083A EP 0754911 B1 EP0754911 B1 EP 0754911B1
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EP
European Patent Office
Prior art keywords
caisson
emitter
emitter according
oven
air
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.)
Expired - Lifetime
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EP96420083A
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German (de)
French (fr)
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EP0754911A2 (en
EP0754911A3 (en
Inventor
Michel Charmes
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A J C
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A J C
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Publication of EP0754911A3 publication Critical patent/EP0754911A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/02—Structural details of mounting
    • F23C5/06—Provision for adjustment of burner position during operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/18—Radiant burners using catalysis for flameless combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure
    • F26B23/024—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure by means of catalytic oxidation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
    • F26B3/305—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements the infrared radiation being generated by combustion or combustion gases

Definitions

  • the impeller 7 b of the electric fan which is located in the casing 7 a is wedged on one end of a shaft 7 c , the other end of which is assembled with the output shaft of the electric motor 7 d of the electric fan 7.
  • the shaft 7 c is oriented perpendicular to the general direction of the box, as will be explained better below.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Sustainable Development (AREA)
  • Microbiology (AREA)
  • Gas Burners (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

An infrared ray emitter with catalytic burner including a box having an opening covered by a catalytic structure and wherein a supply of combustion gas is applied adjacent the catalytic structure and a supply of recirculating gas is introduced into the box by a fan driven by a motor which extends exteriorly from a furnace in which the emitter is mounted. Brackets are provided to mount the box within a furnace in such a manner that the emitter may be angularly adjusted with respect to the support brackets.

Description

La présente invention est relative aux émetteurs de rayons infrarouges à brûleur catalytique et elle concerne plus particulièrement un tel appareil qui constitue un ensemble monobloc destiné à être installé dans un four.The present invention relates to infrared ray emitters with catalytic burner and it relates more particularly to a such device which constitutes a monobloc assembly intended to be installed in an oven.

On connaít par exemple de GB-A-2 249 491 de tels émetteurs de rayons infrarouges destinés à être installés dans des fours, des tunnels ou étuves destinés plus particulièrement au séchage ou à la polymérisation des peintures liquides ou en poudre sur des supports les plus divers.We know for example from GB-A-2 249 491 such emitters of infrared rays intended to be installed in ovens, tunnels or ovens intended more specifically drying or polymerizing liquid paints or powder on the most diverse supports.

Suivant la technique connue, on dispose sur les parois internes des fours ou analogues des brûleurs catalytiques comportant chacun un cadre qui soutient une structure catalytique composée d'un élément imprégné d'une matière catalytique de combustion. A l'extérieur des cloisons des fours ainsi équipés, il est prévu des tuyauteries d'amenée du gaz combustible qui aboutissent dans chaque brûleur à un Venturi assurant le prémélange air/gaz, des conducteurs d'amenée du courant électrique pour les résistances de pré-chauffage des structures catalytiques et enfin des gaines destinées à diffuser de l'air engendré par un générateur d'air à turbine de manière à diffuser de l'air sur la surface des structures catalytiques.According to the known technique, there are on the internal walls of the furnaces or the like of catalytic burners each comprising a frame which supports a catalytic structure composed of an impregnated element of a catalytic material of combustion. Outside the partitions of ovens thus equipped, fuel gas supply pipes are provided which end in each burner with a Venturi ensuring the air / gas premix, electric current supply conductors for the preheating resistors of the catalytic structures and finally ducts intended to diffuse air generated by a generator turbine air so as to diffuse air on the surface of the structures catalytic.

On comprend qu'une telle construction est complexe, de telle sorte qu'un four ou analogue ainsi équipé est d'un prix de revient très élevé.We understand that such a construction is complex, so that a furnace or the like thus equipped is of a very high cost price.

Les perfectionnements qui font l'objet de la présente invention visent à remédier à ces inconvénients et à permettre la réalisation d'un émetteur de rayons infrarouges à brûleur catalytique qui constitue un ensemble monobloc installé à l'intérieur d'un four ou analogue dont l'ensemble des composants permet un fonctionnement à des températures élevées, de l'ordre de 250°C, tout en comportant des moyens à recycler le milieu gazeux renfermé par le four par oxydation sans flamme des solvants dégagés par la peinture.The improvements which are the subject of the present invention aim to remedy these drawbacks and allow the realization of a infrared ray emitter with catalytic burner which constitutes a monobloc assembly installed inside an oven or the like all components allow operation at temperatures high, of the order of 250 ° C., while comprising means for recycling the gaseous medium enclosed by the furnace by flameless oxidation of the solvents given off by the paint.

A cet effet, l'émetteur de rayons infrarouges à brûleur catalytique suivant l'invention destiné à être installé dans un four comprend :

  • un caisson dont une grande face est ouverte ;
  • une structure catalytique disposée dans la face ouverte du caisson ;
  • un organe d'injection de gaz combustible ;
  • un générateur d'air à turbine envoyant de l'air sous pression dans le caisson qui constitue chambre de distribution d'air sur toute la structure catalytique ;
  • un sytème électrique de préchauffage de la structure catalytique et
  • deux consoles aptes à être rendues solidaires d'une paroi du four, entre lesquelles le caisson est monté et dont l'une au moins comporte un passage centré sur un axe longitudinal du caisson, alors qu'une flasque d'extrémité de caisson comporte une découpe centrale correspondant à ce passage, de l'air pouvant être expulsé par le générateur d'air vers l'intérieur du caisson en traversant le passage et la découpe.
To this end, the emitter of infrared rays with a catalytic burner according to the invention intended to be installed in an oven comprises:
  • a box with a large open side;
  • a catalytic structure arranged in the open face of the box;
  • a fuel gas injection member;
  • a turbine air generator sending pressurized air into the box which constitutes an air distribution chamber over the entire catalytic structure;
  • an electrical system for preheating the catalytic structure and
  • two consoles capable of being made integral with a wall of the furnace, between which the box is mounted and at least one of which has a passage centered on a longitudinal axis of the box, while a box end flange has a central cutout corresponding to this passage, air that can be expelled by the air generator towards the interior of the box by crossing the passage and the cutout.

Suivant une forme de réalisation avantageuse, l'une des consoles étant assemblée à une embase à laquelle est fixée le carter de la turbine du générateur d'air. Cette turbine est calée sur un arbre qui traverse la paroi du four sur laquelle les consoles sont fixées pour coopérer à l'extérieur de celui-ci avec le dispositif d'entraínement de ladite turbine. De manière préférée, le caisson est monté orientable par rapport aux consoles.According to an advantageous embodiment, one of the consoles being assembled to a base to which the air generator turbine housing. This turbine is set on a tree running through the wall of the oven on which the brackets are fixed to cooperate outside of it with the drive device of said turbine. Preferably, the box is mounted adjustable relative to the consoles.

Le dessin annexé, donné à titre d'exemple, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer :

  • Fig. 1 est une vue éclatée en perspective d'un émetteur de rayon infrarouges conforme à l'invention.
  • Fig. 2 en est une coupe suivant II-II (fig. 1).
  • Fig. 3 est une coupe horizontale suivant III-III (fig. 2) d'un four ou analogue à l'intérieur duquel est installé un émetteur de rayons infrarouges suivant l'invention.
    • The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:
  • Fig. 1 is an exploded perspective view of an infrared ray emitter according to the invention.
  • Fig. 2 is a section along II-II (fig. 1).
  • Fig. 3 is a horizontal section along III-III (Fig. 2) of an oven or the like inside which is installed an infrared ray emitter according to the invention.

    • L'émetteur de rayons infrarouges représenté en fig. 1 comprend essentiellement un caisson 1 réalisé sous la forme un parallélipipède allongé fermé sur cinq de ses faces, l'une 10 des grandes faces étant ouverte.The infrared ray emitter shown in fig. 1 includes essentially a box 1 made in the form of a parallelepiped elongated closed on five of its faces, one of the 10 large faces being opened.

    Comme illustré en fig. 2, une structure catalytique 2 est disposée dans la face ouverte 10 du caisson 1. Cette structure est composée d'un élément 20 imprégné d'une matière catalytique de combustion telle que du platine. Cet élément, qui est perméable au mélange gazeux à brûler, est constitué d'un support inerte tel que de la fibre de verre ou analogue et propre à résister aux températures élevées engendrées par la combustion catalytique. On ne reviendra pas sur une telle structure qui est bien connue dans la pratique.As illustrated in fig. 2, a catalytic structure 2 is arranged in the open face 10 of the box 1. This structure is composed of a element 20 impregnated with a catalytic combustion material such as platinum. This element, which is permeable to the gaseous mixture to be burned, is consisting of an inert support such as fiberglass or the like and able to withstand the high temperatures generated by combustion catalytic. We will not return to such a structure which is well known in practice.

    L'élément 20 est soutenu par un cadre 21 fixé de manière étanche par rapport à la face ouverte 10 du caisson 1. On observe que le cadre 21 est associé à un châssis 22 qui détermine un espace correspondant à la section de la grande face ouverte 10 du caisson 1. Une entretoise 23 dont les extrémités sont fixées au châssis 22 soutient un organe 24 d'injection d'un gaz combustible mélangé à de l'air et débouchant sur la face intérieure de l'élément 20, comme cela est bien connu dans la pratique. L'entretoise 23 soutient encore au moins une résistance électrique 25 de préchauffage de l'élément imprégné 20.Element 20 is supported by a frame 21 tightly fixed relative to the open face 10 of the box 1. It can be seen that the frame 21 is associated with a frame 22 which determines a space corresponding to the section of the large open face 10 of the box 1. A spacer 23 the ends of which are fixed to the chassis 22 supports a member 24 injection of a combustible gas mixed with air and leading to the inner face of element 20, as is well known in the convenient. The spacer 23 still supports at least one electrical resistance 25 for preheating the impregnated element 20.

    Comme illustré en fig. 1, le caisson 1 comporte deux flasques extrêmes 11 et 12 qui sont respectivement fixées à une console 4, 5. Chacune de celles-ci est munie d'une couronne de trous lisses 40, 50 dans chacun desquels on peut engager une vis 3 qui vient se visser dans un trou taraudé correspondant 11a, 12a des flasques 11, 12. La console 5 est réalisée sous la forme d'une équerre, comme on l'expliquera mieux plus loin. La console 5 est assemblée à une plaque support 6 sur laquelle est monté le carter 7a d'un électro-ventilateur 7. Ainsi, en modifiant la position angulaire au caisson 1 par rapport aux consoles 4, 5 on peut orienter le caisson dans la direction souhaitée, comme illustré en traits discontinus en fig. 2. La turbine 7b de l'électro-ventilateur qui se trouve dans le carter 7a est calée sur l'une des extrémité d'un arbre 7c dont l'autre extrémité est assemblée à l'arbre de sortie du moteur électrique 7d de l'électroventilateur 7. L'arbre 7c est orienté perpendiculairement à la direction générale du caisson, comme on l'expliquera mieux plus loin.As illustrated in fig. 1, the box 1 comprises two end plates 11 and 12 which are respectively fixed to a console 4, 5. Each of these is provided with a ring of smooth holes 40, 50 in each of which a screw 3 can be engaged which is screwed into a corresponding threaded hole 11, 12a of the flanges 11, 12. the bracket 5 is formed as a square, as will be explained better below. The console 5 is assembled to a support plate 6 on which the casing 7 has of an electro-fan 7. Thus, by modifying the angular position at the box 1 with respect to the consoles 4, 5 one can orient the box in the desired direction, as shown in broken lines in fig. 2. The impeller 7 b of the electric fan which is located in the casing 7 a is wedged on one end of a shaft 7 c , the other end of which is assembled with the output shaft of the electric motor 7 d of the electric fan 7. The shaft 7 c is oriented perpendicular to the general direction of the box, as will be explained better below.

    Comme illustré en fig. 3, l'émetteur de rayons infrarouges suivant l'invention est fixé par ses consoles 4, 5 sur la paroi interne 9a d'une cloison 9 d'un four, tunnel ou étuve convenablement calorifugée. La console 5 est fixée sur la cloison 9 par sa partie à angle droit 52 qui traversée par l'arbre 7c de l'électro-ventilateur 7. Ce dernier traverse cette cloison de manière étanche à la chaleur par tous moyens appropriés, notamment dans un manchon isolant 53. De même manière, le tuyau 24a d'alimentation de l'organe d'injection 24 de gaz combustible et les conducteurs d'alimentation électrique des résistances 25 traversent de manière étanche à la chaleur la cloison 9. Le tuyau 24a et les conducteurs sont issus d'un coffret de commande 8 qui est fixé sur la paroi extérieure 9b de la cloison 9, de manière à ne pas être exposés à la chaleur régnant à l'intérieur du four ou analogue.As illustrated in fig. 3, the infrared radiation according to the invention is fixed by its brackets 4, 5 of the inner wall 9 has a partition 9 of an oven, suitably insulated tunnel or oven. The console 5 is fixed to the partition 9 by its right-angle part 52 which passes through the shaft 7c of the electric fan 7. The latter passes through this partition in a heat-tight manner by any appropriate means, in particular in an insulating sleeve 53. Similarly, the pipe 24 has the injection member 24 supply fuel gas and the power conductors of the resistors 25 through a sealed manner to heat the partition 9. the pipe 24 a and the conductors come from a control box 8 which is fixed to the outer wall 9 b of the partition 9, so as not to be exposed to the heat prevailing inside the oven or the like.

    En revenant à fig. 1, on ccnstate que l'orifice de sortie du carter 7a débouche dans une ouverture correspondante 60 de la plaque support 6 qui est centrée sur l'axe géométrique longitudinal référencé X du caisson 1. A l'intérieur de la couronne de trous 50, la console 5 comporte un passage 51 dont le centre se trouve sur l'axe X. Il en va de même de la flasque 11 qui comporte une découpe centrale 11b correspondant au passage 51. Par contre, la flasque 12 est pleine, c'est-à-dire non percée. Ainsi, lorsque la turbine 7b de l'électro-ventilateur 7 est mise en route, l'air aspiré dans l'enceinte du four ou analogue est expulsé à l'intérieur du caisson 1 en traversant l'ouverture 60, le passage 51 et la découpe 11b de telle manière que le caisson 1 constitue une chambre de distribution de l'air expulsé sur toute la surface de l'élément 20.Returning to fig. 1, it is ccnstate that the outlet orifice of the casing 7 has opens into a corresponding opening 60 of the support plate 6 which is centered on the longitudinal geometrical axis referenced X of the box 1. Inside the ring of holes 50 , the console 5 has a passage 51, the center of which is on the axis X. The same applies to the flange 11 which has a central cutout 11 b corresponding to the passage 51. On the other hand, the flange 12 is full, c is to say not pierced. Thus, when the turbine 7b of the electric fan 7 is started, the air sucked into the oven enclosure or the like is expelled inside the box 1 through the opening 60, the passage 51 and the cutout 11b in such a way that the box 1 constitutes a distribution chamber for the air expelled over the entire surface of the element 20.

    La conception de l'émetteur suivant l'invention permet son montage dans des fours ou analogues existants sans modifications importantes de ceux-ci et avec une mise en place très simple. De plus, du fait que l'air envoyé dans le caisson 1 est celui qui se trouve dans l'enceinte du four ou analogue, les solvants émis par le séchage ou la polymérisation des peintures sont brûlés au niveau de l'élément 20 imprégné d'une matière catalytique, si bien que le milieu gazeux renfermé par le four est recyclé automatiquement de manière intense.The design of the transmitter according to the invention allows its mounting in existing ovens or the like without significant modifications to these and with a very simple set up. In addition, because the air sent into box 1 is that which is inside the enclosure from the oven or the like, the solvents emitted by drying or polymerization paints are burnt at the impregnated element 20 of a catalytic material, so that the gaseous medium contained by the oven is automatically recycled intensively.

    Enfin, par suite de la localisation des appareils délicats (moteur électrique, instruments de commande) hors de l'enceinte du four ou analogue, l'émetteur monobloc suivant l'invention peut supporter des températures élevées, de l'ordre de 250°C.Finally, due to the location of delicate devices (motor electric, control instruments) outside the oven or similar, the monoblock transmitter according to the invention can withstand high temperatures, of the order of 250 ° C.

    Claims (8)

    1. Infrared ray emitter with a catalytic burner, which is designed to be installed in an oven, and comprising:
      a caisson (1), one large surface (10) of which is open;
      a catalytic structure (2), consisting of an element (20) which is impregnated with a catalytic combustion material, placed in a frame (21), which itself is disposed in the open surface (10) of the caisson;
      a unit (24) for injection of a combustible gas, which is situated in the caisson, and opens onto the inner surface of the impregnated element, the said unit being supplied with gas by a pipe (24a);
      an air generator (7) with a turbine (7b), which conveys compressed air into the caisson, which constitutes a chamber for distribution of air over the entire surface of the impregnated element;
      an electrical system (25) for pre-heating of the impregnated element (22), the said emitter constituting a monoblock unit, which is designed to be disposed in the oven, and comprises first means (2, 53) for functioning at high temperatures of approximately 250°C, and second means (2, 5, 7, 11b) for recycling the gaseous medium which is contained in the oven, characterised in that it comprises two consoles (4, 5), which can be rendered integral with a wall (9) of the oven, between which the caisson is mounted, and at least one (5) of which comprises a passage (51), which is centred on a longitudinal axis (X) of the caisson, whereas an end flange (11) of the caisson comprises a central cut-out (11b), which corresponds to this passage, air being able to be expelled by the air generator (7) towards the interior of the caisson, by passing through the said passage (51) and the said cut-out (11b).
    2. Emitter according to claim 1, characterised in that the said console (5) is assembled to a base (6), to which there is secured the housing (7a) of the turbine (7) of the air generator, whereas the outlet aperture of the housing opens into an aperture (60) in the base, this aperture being centred on the longitudinal axis (X) of the caisson.
    3. Emitter according to any one of the preceding claims, characterised in that each console (4, 5) is provided with a ring of smooth holes (40, 50), in each of which there can be engaged a screw (3), which is screwed into a threaded hole (11a, 12a) in one of the end flanges (11, 12) of the caisson.
    4. Emitter according to any one of the preceding claims, characterised in that the caisson (1) is mounted such as to be oriented relative to the consoles (4, 5).
    5. Emitter according to any one of the preceding claims, characterised in that the turbine (7b) is wedged onto a shaft (7c), which is oriented perpendicularly to the general direction (X) of the caisson (1), in order to pass through the partition (9) on which the consoles (4, 5) are secured, in order to co-operate with a drive motor (7d) which is secured to the outer surface (9b) of the said partition.
    6. Emitter according to any one of the preceding claims, characterised in that the pipe (24a) to supply gas to the injection unit (24) and the electrical conductors of the pre-heating system (25) pass through the partition (9), in order to lead to a control box (8), which is secured to the outer surface (9b) of the said partition (9).
    7. Emitter according to any one of the preceding claims, characterised in that the frame (21) of the caisson (1) is associated with a framework (22), on which there is secured a brace (23) to support the unit (24) for injection of gas.
    8. Emitter according to claim 7, characterised in that the brace (23) supports at least one electrical resistor (25), for pre-heating of the impregnated element (20).
    EP96420083A 1995-07-20 1996-03-14 Infrared rays emitter with a catalytic burner Expired - Lifetime EP0754911B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    US08/504,946 US5586877A (en) 1995-07-20 1995-07-20 Infrared ray emitters with catalytic burner
    US504946 1995-07-20

    Publications (3)

    Publication Number Publication Date
    EP0754911A2 EP0754911A2 (en) 1997-01-22
    EP0754911A3 EP0754911A3 (en) 1998-06-03
    EP0754911B1 true EP0754911B1 (en) 2001-12-12

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP96420083A Expired - Lifetime EP0754911B1 (en) 1995-07-20 1996-03-14 Infrared rays emitter with a catalytic burner

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    US (1) US5586877A (en)
    EP (1) EP0754911B1 (en)
    JP (1) JP3098187B2 (en)
    AT (1) ATE210798T1 (en)
    DE (1) DE69617822T2 (en)

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    JPH0929156A (en) 1997-02-04
    DE69617822D1 (en) 2002-01-24
    EP0754911A2 (en) 1997-01-22
    EP0754911A3 (en) 1998-06-03
    JP3098187B2 (en) 2000-10-16
    ATE210798T1 (en) 2001-12-15
    US5586877A (en) 1996-12-24
    DE69617822T2 (en) 2002-08-14

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