EP3899368A1 - Method for depositing a catalyst at the surface of a catalytic combustion burner - Google Patents

Method for depositing a catalyst at the surface of a catalytic combustion burner

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Publication number
EP3899368A1
EP3899368A1 EP19829572.7A EP19829572A EP3899368A1 EP 3899368 A1 EP3899368 A1 EP 3899368A1 EP 19829572 A EP19829572 A EP 19829572A EP 3899368 A1 EP3899368 A1 EP 3899368A1
Authority
EP
European Patent Office
Prior art keywords
burner
catalyst
catalytic
catalytic combustion
composition
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.)
Granted
Application number
EP19829572.7A
Other languages
German (de)
French (fr)
Other versions
EP3899368C0 (en
EP3899368B1 (en
Inventor
Corinne Gerard
Laurent Ozouf
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.)
Produits Berger SAS
Original Assignee
Produits Berger SAS
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 Produits Berger SAS filed Critical Produits Berger SAS
Publication of EP3899368A1 publication Critical patent/EP3899368A1/en
Application granted granted Critical
Publication of EP3899368C0 publication Critical patent/EP3899368C0/en
Publication of EP3899368B1 publication Critical patent/EP3899368B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D3/00—Burners using capillary action
    • F23D3/02—Wick burners
    • F23D3/18—Details of wick burners
    • F23D3/24—Carriers for wicks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2213/00—Burner manufacture specifications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/03081—Catalytic wick burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/31004—Wick burners using alcohol as a fuel

Definitions

  • the present invention relates generally to the field of catalytic combustion, and more specifically that of catalytic combustion burners made of porous material. These burners are in particular used for the diffusion of perfume and or active substances, for the destruction of odorous molecules or not, and / or for the cleaning of the air.
  • Such a burner has for example been described in French patent application FR3061543 in the name of the applicant. It is in particular a burner intended to receive a wick soaking in a combustible liquid contained in a catalytic combustion flask, which receives the burner at its neck.
  • a burner (in particular shown in FIG. 3A) is made of a porous material, which comprises a nozzle having at its upper part a cavity opening to the outside and at its lower part, a cavity in which the end of the the wick. The end piece is extended at its bottom by a sleeve.
  • the outer face of the upper part of the nozzle, and its upper face (of annular shape) are doped with a catalyst.
  • the same is true of the inner face of the upper part of the end piece.
  • the combustible liquid supplied by the wick penetrates into the pores of the porous material of the burner. Part of this liquid passes through the central zone of the burner and undergoes vaporization there.
  • the present invention therefore relates to a process for depositing a catalyst on the surface of a catalytic combustion burner, said catalytic combustion burner being made of a porous material and comprising:
  • a nozzle with an upper part and a lower part, said upper part having a lateral peripheral wall comprising an inner face delimiting a cavity, an outer face of essentially cylindrical shape, and an upper face of crown shape, and
  • a sleeve disposed in the extension of the lower part of said nozzle, and comprising a cavity adapted to enclose a wick intended to bring a combustible composition to the burner,
  • said process being characterized in that said catalytic composition is a non-Newtonian fluid present, before application to the nozzle (1), a dynamic viscosity p c of at least 15 mPa.s. at room temperature.
  • Newtonian fluid is meant, within the meaning of the present invention, a fluid whose viscosity does not depend on its shearing speed, or on the time during which the liquid is sheared.
  • the catalytic composition can comprise: between 1% and 5% by weight relative to the total weight of the catalytic catalyst composition chosen from the metals belonging to groups 9 or 10 of the periodic table of elements, and
  • compound capable of increasing the resistance to flow of a fluid is meant in the sense of the present invention, a compound capable of imparting to said fluid a dynamic viscosity pc of at least 5 mPa.s. at room temperature (that is to say of the order of 20 ° C.).
  • said compound capable of increasing the resistance is selected from
  • the flow can be a polymer derived from glucose or a polymer derived from ethylene oxide.
  • step B) of heat treatment comprises maintaining the temperature Ta for at least 3 hours.
  • the present invention also relates to a catalytic combustion burner capable of being coated with a catalyst according to the method according to the invention.
  • the present invention also relates to a catalytic combustion bottle, adapted to contain a combustible liquid and to receive at its neck a catalytic combustion burner receiving a wick soaking in said liquid, said bottle (20) being equipped with a burner according to the invention.
  • FIG 1 schematically shows a photograph of an example of a catalytic combustion burner with catalyst, which may have been treated by the process according to the invention by impregnating a catalyst on its surface;
  • FIG 2 is a schematic elevational view of a bottle equipped with the catalytic combustion burner burner of Fig 1;
  • FIG 3A is an IR thermography carried out to show the impact of a deposit of the catalyst on the surface of the nozzle of a catalytic combustion burner treated according to a conventional deposit, in the absence of air conditioning
  • FIG 3B is an IR thermography performed to show the impact of a deposit of the catalyst on the surface of the nozzle of a catalytic combustion burner treated according to the method of the invention, in the absence air conditioning;
  • FIG 4A is an IR thermography carried out to show the impact of a deposit of the catalyst on the surface of the nozzle of a catalytic combustion burner treated according to a conventional deposit, in the presence of air conditioning,
  • FIG 4B is an IR thermography performed to show the impact of a deposit of the catalyst on the surface of the nozzle of a catalytic combustion burner treated according to the method of the invention, in the presence of a
  • FIG 5 illustrates the protocol for measuring by infrared camera the impact of air conditioning on the temperature of the burner in operation.
  • Fig 1 is shown schematically a cross section of an example of a catalytic combustion burner with catalyst, which may have been treated by the method according to the invention by impregnating a catalyst on its surface.
  • a burner 1 is made of a porous material, which comprises a nozzle 1 having at its upper part 10 a cavity (or bowl) 100 opening to the outside and at its lower part 1 1, a cavity in which is engaged the end of a wick 40 intended to supply the burner with a combustible composition 30 (in the examples below isopropyl alcohol) coming from the bottle 20, at the neck 5 to which the burner is installed 1.
  • the nozzle 1 is extended at its lower part by a sleeve 2 (also called barrel).
  • a sleeve 2 also called barrel
  • the combustible liquid 30 is usually an alcohol, for example isopropyl alcohol, or any other suitable liquid fuel compatible with the legislation in force. force in this area.
  • the combustible liquid 30 must be such that its vaporization and catalytic combustion do not give off an odor
  • the combustible liquid 30 may further comprise a scented material and / or an active material.
  • the wick 40 is any known wick, for example a cotton wick, or a wick of mineral material, for example of mineral fibers.
  • the combustible liquid 30 of the bottle 20 rises in the wick 40 by capillary action and penetrates into the pores of the porous material of the burner, which when it has been preheated, ensures its catalytic combustion.
  • the upper part 10 of the end piece 1 has a lateral peripheral wall comprising an inner face of essentially frustoconical shape delimiting a cup-shaped cavity 100, an outer face 101 of essentially cylindrical shape, and a crown-shaped upper face 102.
  • a catalyst (not visible in Fig 1 and Fig 2) was deposited on the outer face 101 and the crown 102 of the nozzle 1, either according to the method according to the invention (designated in the examples which follow by "Burner B1"), or in accordance with a process known to those skilled in the art (designated in the examples which follow by "burner BC.”). In the latter case, the burner for which doping has been carried out conventionally is used as a control in the catalytic operation tests with and without
  • the burner 10 (either that according to the invention as shown in Fig 5, or that of the prior art shown in Fig 1, is installed in the neck 50 of the bottle (for example using '' a metal base placed in the neck 50) .
  • the wick 40 is received inside the burner 10, this wick 40 with catalytic combustion receiving a wick (40) dipping in the liquid 30.
  • the bottle 20 can be a bottle of any shape with a neck 50 in which the burner 10 is fitted.
  • Aqueous, alcoholic, or hydro-alcoholic solvent aqueous, alcoholic, or hydro-alcoholic solvent
  • the catalyst used (whether on parts 100, 101 or 102 of the burner) is a metal belonging to groups 9 or 10 of the periodic table of the elements. It is present in an amount of 2% by weight of the weight of the catalytic composition according to the invention.
  • the catalyst used (whether on the sides 100, 101 or 102 of the burner) is a metal belonging to groups 9 or 10 of the periodic table of the elements. It is present in an amount of 2% by weight relative to the weight of the control catalytic composition.
  • thermal conductive compound silicon carbide (1%),
  • refractory compound mullite (66.5%), binder: glass (11.5%),
  • blowing agent polymethyl methacrylate (PMMA: 21.5%).
  • BC burner shown in FIG. 1 made of a porous material obtained from composition C, and whose faces 100, 101 and 102 of the burner are doped with the control catalytic composition permeating them.
  • the application of the catalytic composition on the faces 100, 101 and 102 of the burner nozzle is done by impregnation then baking to a temperature of at least 450 ° C, then maintaining at this temperature for at least 3 hours .
  • Burner “B1" (shown in FIG. 1) made of a porous material obtained from composition C, and the faces 100, 101 and 102 of the burner of which are doped with the catalytic composition according to the invention permeating them.
  • the application of the catalytic composition on the faces 100, 101 and 102 of the burner nozzle is done by impregnation then baking to a temperature of at least 450 ° C, then maintaining at this temperature for at least 3 hours .
  • the test protocol is shown in Fig 5. It generally consists of measure by infrared thermography (IR) using an IR thermal camera the temperature on each of the burners tested (Bl and BC) operating on the bottle 20, placed at a reasonable distance from an air conditioner (whose power is 800 W as part of the tests carried out), at the low level of Fig 4A and Fig 4B. These measurements are also compared, for each burner tested (control 1 C and according to the invention 1 and 2), to measurements carried out without ventilation.
  • IR infrared thermography
  • thermographys of Fig 3A and Fig 3B in the case of an absence of air conditioning, shows that the temperature of the central diffusion zone of the burner decreases by 389 ° C (treatment with the control catalytic composition) to 364 ° C when treating the faces 100, 101 and 102 of the tip of the catalyst according to the method according to the invention.
  • thermographys of Fig 3A and Fig 3B shows a similar effect in the presence of air conditioning: the temperature of the central diffusion zone of the burner decreases by 357 ° C (for treatment with the control catalytic composition) at 318 ° C when treating the faces 100, 101 and 102 of the tip of the catalyst according to the method according to the invention.
  • the catalyst penetrates less deeply inside the burner, so that the temperature of the central diffusion zone of the burner is lower than if the control catalyst composition had been applied.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Catalysts (AREA)
  • Gas Burners (AREA)
  • Spray-Type Burners (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)

Abstract

The present invention also relates to a method for depositing a catalyst at the surface of a catalytic combustion burner, comprising an end piece (1) of which the upper part (10) comprises an inner face (100), an outer face (101) and a crown-shaped upper face (102), and a sleeve (2) in the extension of the end piece (1), suitable for gripping a wick intended to convey a combustible composition to the burner. The method comprises A) a step of impregnating the outer (101), and inner (100) or upper (102), faces with a catalytic composition comprising at least one catalyst belonging to group 9 or 10 of the periodic table of elements; and B) a step of heat-treating the burner at a temperature Ta of at least 450°C. According to the invention, the catalytic composition is a non-Newtonian fluid exhibiting, before application on the end piece (1), a dynamic viscosity μc of at least 15 m Pa.s. at 20°C. The present invention also relates to a catalytic combustion burner which can be coated with a catalyst in accordance with the method according to the invention, and to a catalytic combustion bottle suitable for containing a combustible liquid and for receiving at its neck a catalytic combustion burner according to the invention.

Description

Description Description
Titre de l'invention : PROCÉDÉ DE DEPOT D’UN CATALYSEUR A LA Title of the invention: METHOD FOR DEPOSITING A CATALYST TO THE
SURFACE D’UN BRULEUR A COMBUSTION CATALYTIQUE SURFACE OF A CATALYTIC COMBUSTION BURNER
[0001 ] La présente invention concerne de manière générale le domaine de la combustion catalytique, et plus précisément celui des brûleurs à combustion catalytique en matériau poreux. Ces brûleurs sont en particulier utilisés pour la diffusion de parfum et ou de substances actives, pour la destruction de molécules odorantes ou non, et/ou pour l’assainissement de l’air. The present invention relates generally to the field of catalytic combustion, and more specifically that of catalytic combustion burners made of porous material. These burners are in particular used for the diffusion of perfume and or active substances, for the destruction of odorous molecules or not, and / or for the cleaning of the air.
[0002] Un tel brûleur a par exemple été décrit dans la demande de brevet français FR3061543 au nom de la demanderesse. Il s’agit en particulier d’un brûleur destiné à recevoir une mèche trempant dans un liquide combustible contenu dans un flacon à combustion catalytique, qui reçoit le brûleur au niveau de son goulot. Un tel brûleur (notamment représenté sur la Fig 3A) est réalisé en un matériau poreux, qui comprend un embout présentant à sa partie supérieure une cavité débouchant à l’extérieur et à sa partie inférieure, une cavité dans laquelle est engagée l’extrémité de la mèche. L’embout se prolonge à sa partie inférieure par un manchon. La face extérieure de la partie supérieure de l’embout, et sa face supérieure (de forme annulaire) sont dopées par un catalyseur. De manière avantageuse, il en est de même de la face intérieure de la partie supérieure de l’embout. En fonctionnement, le liquide combustible amené par la mèche pénètre dans les pores du matériau poreux du brûleur. Une partie de ce liquide traverse la zone centrale du brûleur et y subit une vaporisation. Such a burner has for example been described in French patent application FR3061543 in the name of the applicant. It is in particular a burner intended to receive a wick soaking in a combustible liquid contained in a catalytic combustion flask, which receives the burner at its neck. Such a burner (in particular shown in FIG. 3A) is made of a porous material, which comprises a nozzle having at its upper part a cavity opening to the outside and at its lower part, a cavity in which the end of the the wick. The end piece is extended at its bottom by a sleeve. The outer face of the upper part of the nozzle, and its upper face (of annular shape) are doped with a catalyst. Advantageously, the same is true of the inner face of the upper part of the end piece. In operation, the combustible liquid supplied by the wick penetrates into the pores of the porous material of the burner. Part of this liquid passes through the central zone of the burner and undergoes vaporization there.
[0003] On constate toutefois qu’un tel brûleur présente l’inconvénient, lorsqu’il est dopé de conduire, en fonctionnement à une augmentation de la However, it is found that such a burner has the drawback, when it is doped to drive, in operation to an increase in the
température au niveau de la zone centrale de diffusion du brûleur, ce qui nuit à la qualité olfactive lorsque le brûleur est utilisé pour la diffusion de parfum. temperature in the central diffusion zone of the burner, which affects the olfactory quality when the burner is used for the diffusion of perfume.
[0004] Afin de pallier cet inconvénient précité, le demandeur a mis au point un procédé de dépôt du catalyseur permettant une meilleure répartition de celui-ci à la surface de l’embout du brûleur et donc d’éviter une température trop élevée au niveau de la zone centrale. [0005] Plus particulièrement, la présente invention a donc pour objet un procédé de dépôt d’un catalyseur à la surface d’un brûleur à combustion catalytique, ledit brûleur à combustion catalytique étant constitué d’un matériau poreux et comprenant : In order to overcome this aforementioned drawback, the applicant has developed a process for depositing the catalyst allowing a better distribution of the latter on the surface of the burner nozzle and therefore avoiding a temperature that is too high at the level from the central area. More particularly, the present invention therefore relates to a process for depositing a catalyst on the surface of a catalytic combustion burner, said catalytic combustion burner being made of a porous material and comprising:
un embout avec une partie supérieure et une partie inférieure, ladite partie supérieure présentant une paroi périphérique latérale comportant une face intérieure délimitant une cavité, une face extérieure de forme essentiellement cylindrique, et une face supérieure en forme de couronne, et a nozzle with an upper part and a lower part, said upper part having a lateral peripheral wall comprising an inner face delimiting a cavity, an outer face of essentially cylindrical shape, and an upper face of crown shape, and
un manchon disposé dans le prolongement de la partie inférieure dudit embout, et comportant une cavité adaptée à enserrer une mèche destinée à amener au brûleur une composition combustible, a sleeve disposed in the extension of the lower part of said nozzle, and comprising a cavity adapted to enclose a wick intended to bring a combustible composition to the burner,
ledit procédé comprenant : said process comprising:
A) une étape d’imprégnation de ladite face extérieure et, soit de ladite face intérieure, soit de ladite couronne de l’embout, soit de ladite face intérieure et de ladite couronne, par une composition catalytique contenant au moins un catalyseur appartenant aux groupes 9 ou 10 du tableau de classification périodique des éléments ; A) a step of impregnating said outer face and either of said inner face or of said crown of the nozzle, or of said inner face and of said crown, with a catalytic composition containing at least one catalyst belonging to the groups 9 or 10 of the periodic table of the elements;
B) une étape de traitement thermique dudit brûleur ainsi imprégné du catalyseur jusqu’à une température Ta d’au moins 450°C, B) a step of heat treatment of said burner thus impregnated with the catalyst up to a temperature Ta of at least 450 ° C.,
ledit procédé étant caractérisé en ce que ladite composition catalytique est un fluide non newtonien présente, avant application sur l’embout (1 ), une viscosité dynamique pc d’au moins 15 mPa.s. à température ambiante. said process being characterized in that said catalytic composition is a non-Newtonian fluid present, before application to the nozzle (1), a dynamic viscosity p c of at least 15 mPa.s. at room temperature.
[0006] Par fluide newtonien, on entend, au sens de la présente invention, un fluide dont la viscosité ne dépend ni de sa vitesse de cisaillement, ni du temps pendant lequel le liquide est cisaillé. By Newtonian fluid is meant, within the meaning of the present invention, a fluid whose viscosity does not depend on its shearing speed, or on the time during which the liquid is sheared.
[0007] De manière avantageuse, la composition catalytique peut comprendre : entre 1 % et 5 % en poids par rapport au poids total de la composition catalytique catalyseur choisi parmi les métaux appartenant aux groupes 9 ou 10 du tableau de classification périodique des éléments, et Advantageously, the catalytic composition can comprise: between 1% and 5% by weight relative to the total weight of the catalytic catalyst composition chosen from the metals belonging to groups 9 or 10 of the periodic table of elements, and
entre 0,2% et 2% en poids par rapport au poids total de la composition catalytique d’un composé apte à augmenter la résistance à l’écoulement de ladite composition catalytique. [0008] Par composé apte à augmenter la résistance à l’écoulement d’un fluide, on entend au sens de la présente invention, un composé apte à conférer audit fluide une viscosité dynamique pc d’au moins 5 mPa.s. à température ambiante (c’est-à-dire de l’ordre de 20°C). between 0.2% and 2% by weight relative to the total weight of the catalytic composition of a compound capable of increasing the flow resistance of said catalytic composition. By compound capable of increasing the resistance to flow of a fluid, is meant in the sense of the present invention, a compound capable of imparting to said fluid a dynamic viscosity pc of at least 5 mPa.s. at room temperature (that is to say of the order of 20 ° C.).
[0009] De préférence, ledit composé apte à augmenter la résistance à Preferably, said compound capable of increasing the resistance to
l’écoulement peut être un polymère dérivé du glucose ou un polymère dérivé de l’oxyde d’éthylène. the flow can be a polymer derived from glucose or a polymer derived from ethylene oxide.
[0010] De manière avantageuse, l’étape B) de traitement thermique comprend un maintien à la température Ta pendant au moins 3 heures. Advantageously, step B) of heat treatment comprises maintaining the temperature Ta for at least 3 hours.
[0011 ] La présente invention a également pour objet un brûleur à combustion catalytique susceptible d’être revêtu d’un catalyseur conformément au procédé selon l’invention. The present invention also relates to a catalytic combustion burner capable of being coated with a catalyst according to the method according to the invention.
[0012] Enfin, la présente invention a encore pour objet un flacon à combustion catalytique, adapté à contenir un liquide combustible et à recevoir au niveau de son goulot un brûleur à combustion catalytique recevant une mèche trempant dans ledit liquide, ledit flacon (20) étant équipé d’un brûleur selon l’invention. Finally, the present invention also relates to a catalytic combustion bottle, adapted to contain a combustible liquid and to receive at its neck a catalytic combustion burner receiving a wick soaking in said liquid, said bottle (20) being equipped with a burner according to the invention.
[0013] D'autres caractéristiques et avantages de l'invention ressortiront Other features and advantages of the invention will emerge
clairement de la description détaillée qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux figures annexées dans lesquels : clearly from the detailed description given below, by way of indication and in no way limiting, with reference to the appended figures in which:
[0014] [Fig 1 ] représente schématiquement une photographie d'un exemple de brûleur à combustion catalytique avec catalyseur, susceptible d’avoir été traité par le procédé selon l’invention par imprégnation d’un catalyseur à sa surface ; [Fig 1] schematically shows a photograph of an example of a catalytic combustion burner with catalyst, which may have been treated by the process according to the invention by impregnating a catalyst on its surface;
[0015] [Fig 2] est une vue schématique en élévation d’un flacon équipé du brûleur brûleurs à combustion catalytique de la Fig 1 ; [Fig 2] is a schematic elevational view of a bottle equipped with the catalytic combustion burner burner of Fig 1;
[0016] [Fig 3A] est une thermographie IR réalisée pour montrer l’impact d’un dépôt du catalyseur à la surface de l’embout d’un brûleur à combustion catalytique traité selon un dépôt classique, en l’absence de climatisation, [0017] [Fig 3B] est une thermographie IR réalisée pour montrer l’impact d’un dépôt du catalyseur à la surface de l’embout d’un brûleur à combustion catalytique traité selon le procédé de l’invention, en l’absence de climatisation ; [Fig 3A] is an IR thermography carried out to show the impact of a deposit of the catalyst on the surface of the nozzle of a catalytic combustion burner treated according to a conventional deposit, in the absence of air conditioning, [Fig 3B] is an IR thermography performed to show the impact of a deposit of the catalyst on the surface of the nozzle of a catalytic combustion burner treated according to the method of the invention, in the absence air conditioning;
[0018] [Fig 4A] est une thermographie IR réalisée pour montrer l’impact d’un dépôt du catalyseur à la surface de l’embout d’un brûleur à combustion catalytique traité selon un dépôt classique, en présence d’une climatisation, [Fig 4A] is an IR thermography carried out to show the impact of a deposit of the catalyst on the surface of the nozzle of a catalytic combustion burner treated according to a conventional deposit, in the presence of air conditioning,
[0019] [Fig 4B] est une thermographie IR réalisée pour montrer l’impact d’un dépôt du catalyseur à la surface de l’embout d’un brûleur à combustion catalytique traité selon le procédé de l’invention, en présence d’une [Fig 4B] is an IR thermography performed to show the impact of a deposit of the catalyst on the surface of the nozzle of a catalytic combustion burner treated according to the method of the invention, in the presence of a
climatisation; air conditioner;
[0020] [Fig 5] illustre le protocole de mesure par caméra infrarouge de l’impact d’une climatisation sur la température du brûleur en fonctionnement. [Fig 5] illustrates the protocol for measuring by infrared camera the impact of air conditioning on the temperature of the burner in operation.
[0021 ] Les caractéristiques techniques communes aux [Fig 1 ] et [Fig 2] sont désignées chacune par la même référence numérique dans les figures concernées. The technical characteristics common to [Fig 1] and [Fig 2] are each designated by the same reference numeral in the figures concerned.
[0022] Les Fig 3A, Fig 3B, Fig 4A, Fig 4B et Fig 5 sont commentées dans la partie descriptive des exemples, qui suit la description des Fig 1 et Fig 2. Figs 3A, Fig 3B, Fig 4A, Fig 4B and Fig 5 are commented on in the descriptive part of the examples, which follows the description of Fig 1 and Fig 2.
[0023] Sur la Fig 1 , est représentée schématiquement une coupe transversale d'un exemple de brûleur à combustion catalytique avec catalyseur, susceptible d’avoir été traité par le procédé selon l’invention par imprégnation d’un catalyseur à sa surface. Un tel brûleur 1 est réalisé en un matériau poreux, qui comprend un embout 1 présentant à sa partie supérieure 10 une cavité (ou cuvette) 100 débouchant à l’extérieur et à sa partie inférieure 1 1 , une cavité dans laquelle est engagée l’extrémité d’une mèche 40 destinée à amener au brûleur une composition combustible 30 (dans les exemples ci-après de l’alcool isopropylique) provenant du flacon 20, au goulot 5 à duquel est installé le brûleur 1. L’embout 1 se prolonge à sa partie inférieure par un manchon 2 (également appelé fût). Sur la Fig 2, est représentée schématiquement en élévation le flacon 20 équipé du brûleur 1 de la Fig 1.Le liquide combustible 30 est habituellement un alcool, par exemple de l’alcool isopropylique, ou tout autre combustible liquide approprié compatible avec la législation en vigueur dans ce domaine. En particulier, le liquide combustible 30 doit être tel que sa vaporisation et sa combustion catalytique ne dégagent pas d’odeur In Fig 1 is shown schematically a cross section of an example of a catalytic combustion burner with catalyst, which may have been treated by the method according to the invention by impregnating a catalyst on its surface. Such a burner 1 is made of a porous material, which comprises a nozzle 1 having at its upper part 10 a cavity (or bowl) 100 opening to the outside and at its lower part 1 1, a cavity in which is engaged the end of a wick 40 intended to supply the burner with a combustible composition 30 (in the examples below isopropyl alcohol) coming from the bottle 20, at the neck 5 to which the burner is installed 1. The nozzle 1 is extended at its lower part by a sleeve 2 (also called barrel). In FIG. 2, the bottle 20 equipped with the burner 1 in FIG. 1 is shown diagrammatically in elevation. The combustible liquid 30 is usually an alcohol, for example isopropyl alcohol, or any other suitable liquid fuel compatible with the legislation in force. force in this area. In particular, the combustible liquid 30 must be such that its vaporization and catalytic combustion do not give off an odor
désagréable. Le liquide combustible 30 peut en outre comprendre une matière parfumée et/ou une matière active. unpleasant. The combustible liquid 30 may further comprise a scented material and / or an active material.
[0024] La mèche 40 est une mèche connue quelconque, par exemple une mèche en coton, ou une mèche en matière minérale, par exemple en fibres minérales. En fonctionnement, le liquide combustible 30 du flacon 20 monte dans la mèche 40 par capillarité et pénètre dans les pores de la matière poreuse du brûleur, qui lorsqu’il a été préchauffé, assure sa combustion catalytique. En ce qui concerne plus particulièrement la partie supérieure 10 de l’embout 1 , celui-ci présente une paroi périphérique latérale comportant une face intérieure de forme essentiellement tronconique délimitant une cavité en forme de cuvette 100, une face extérieure 101 de forme essentiellement cylindrique, et une face supérieure en forme de couronne 102. The wick 40 is any known wick, for example a cotton wick, or a wick of mineral material, for example of mineral fibers. In operation, the combustible liquid 30 of the bottle 20 rises in the wick 40 by capillary action and penetrates into the pores of the porous material of the burner, which when it has been preheated, ensures its catalytic combustion. As regards more particularly the upper part 10 of the end piece 1, the latter has a lateral peripheral wall comprising an inner face of essentially frustoconical shape delimiting a cup-shaped cavity 100, an outer face 101 of essentially cylindrical shape, and a crown-shaped upper face 102.
[0025] Un catalyseur (non visible sur les Fig 1 et Fig 2) a été déposé sur la face extérieure 101 et la couronne 102 de l’embout 1 , soit conformément au procédé selon l’invention (désigné dans les exemples qui suivent par « brûleur Bl »), soit conformément à un procédé connu de l’homme du métier (désigné dans les exemples qui suivent par « brûleur BC. »). Dans ce dernier cas, le brûleur pour lequel le dopage a été réalisé classiquement est utilisé à titre de témoin dans les essais de fonctionnement catalytique avec et sans A catalyst (not visible in Fig 1 and Fig 2) was deposited on the outer face 101 and the crown 102 of the nozzle 1, either according to the method according to the invention (designated in the examples which follow by "Burner B1"), or in accordance with a process known to those skilled in the art (designated in the examples which follow by "burner BC."). In the latter case, the burner for which doping has been carried out conventionally is used as a control in the catalytic operation tests with and without
climatisation. air conditioner.
[0026] A cet effet, afin de tester le fonctionnement catalytique (en présence ou non d’une climatisation) du bruleur représenté sur la Fig 1 , celui- ci a été disposé dans le flacon 20 à combustion catalytique représenté sur la Fig 2. To this end, in order to test the catalytic operation (whether or not there is air conditioning) of the burner shown in Fig 1, it was placed in the bottle 20 with catalytic combustion shown in Fig 2.
[0027] Le brûleur 10 (soit celui selon l’invention tel que représenté sur la Fig 5, soit celui de l’art antérieur représenté sur la Fig 1 , est installé dans le goulot 50 du flacon (par exemple à l’aide d’une embase métallique placée dans le goulot 50). la mèche 40 est reçue à l’intérieur du brûleur 10, cette mèche 40 à combustion catalytique recevant une mèche (40) trempant dans le liquide 30. Le flacon 20 peut être un flacon de forme quelconque présentant un goulot 50 dans lequel est adapté le brûleur 10. [0028] Les exemples suivants illustrent l’invention, en liaison avec les figures commentées ci-dessus, sans toutefois en limiter la portée. The burner 10 (either that according to the invention as shown in Fig 5, or that of the prior art shown in Fig 1, is installed in the neck 50 of the bottle (for example using '' a metal base placed in the neck 50) .the wick 40 is received inside the burner 10, this wick 40 with catalytic combustion receiving a wick (40) dipping in the liquid 30. The bottle 20 can be a bottle of any shape with a neck 50 in which the burner 10 is fitted. The following examples illustrate the invention, in conjunction with the figures commented above, without however limiting its scope.
[0029] Dans ces exemples, sauf indication contraire, tous les pourcentages et parties sont exprimés en pourcentages massiques. In these examples, unless otherwise indicated, all the percentages and parts are expressed in mass percentages.
[0030] EXEMPLES EXAMPLES
[0031 ] Dispositifs et compositions Devices and compositions
[0032] Composition catalytique selon l’invention Catalytic composition according to the invention
Solvant aqueux, alcoolique, ou hydro-alcoolique, Aqueous, alcoholic, or hydro-alcoholic solvent,
Catalyseur : Catalyst:
Le catalyseur utilisé (que ce soit sur les parties 100, 101 ou 102 du brûleur) est un métal appartenant aux groupes 9 ou 10 du tableau de classification périodique des éléments. Il est présent à raison de 2% en poids du poids de la composition catalytique selon l’invention. The catalyst used (whether on parts 100, 101 or 102 of the burner) is a metal belonging to groups 9 or 10 of the periodic table of the elements. It is present in an amount of 2% by weight of the weight of the catalytic composition according to the invention.
Composé apte à augmenter la résistance à l’écoulement de la Compound capable of increasing the resistance to flow of the
composition catalytique : catalytic composition:
Entre 0,2% et 2% en poids par rapport au poids total de la composition catalytique d’un polymère dérivé du glucose, de manière que la viscosité dynamique pc de la composition avant application est de l’ordre de 20 mPa.s. à 20°C. Between 0.2% and 2% by weight relative to the total weight of the catalytic composition of a polymer derived from glucose, so that the dynamic viscosity p c of the composition before application is of the order of 20 mPa.s . at 20 ° C.
[0033] Composition catalytique témoin : Control catalytic composition:
Eau^ Water ^
Catalyseur, Catalyst,
Le catalyseur utilisé (que ce soit sur les faces 100, 101 ou 102 du brûleur) est un métal appartenant aux groupes 9 ou 10 du tableau de classification périodique des éléments. Il est présent à raison de 2% en poids par rapport au poids de la composition catalytique témoin. The catalyst used (whether on the sides 100, 101 or 102 of the burner) is a metal belonging to groups 9 or 10 of the periodic table of the elements. It is present in an amount of 2% by weight relative to the weight of the control catalytic composition.
[0034] Composition du matériau poreux constitutif des brûleurs : Composition of the porous material constituting the burners:
composé conducteur thermique : carbure de silicium (1 %), thermal conductive compound: silicon carbide (1%),
composé réfractaire : mullite (66,5%), liant : verre (1 1 ,5%), refractory compound: mullite (66.5%), binder: glass (11.5%),
agent porogène : polyméthacrylate de méthyle (PMMA : 21 ,5%). blowing agent: polymethyl methacrylate (PMMA: 21.5%).
[0035] Brûleurs utilisés : Burners used:
A titre d’exemple comparatif : dopage à l’aide de la composition catalytique témoin By way of comparative example: doping using the control catalytic composition
Brûleur « BC » (représenté sur la Fig 1 ) constitué d’un matériau poreux obtenu à partir de la composition C, et dont les faces 100, 101 et 102 du brûleur sont dopées par la composition catalytique témoin les imprégnant. L’application de la composition catalytique sur les faces 100, 101 et 102 de l’embout du brûleur se fait par imprégnation puis cuisson jusqu’à une température d’au moins 450°C, puis maintien à cette température pendant au moins 3 heures. "BC" burner (shown in FIG. 1) made of a porous material obtained from composition C, and whose faces 100, 101 and 102 of the burner are doped with the control catalytic composition permeating them. The application of the catalytic composition on the faces 100, 101 and 102 of the burner nozzle is done by impregnation then baking to a temperature of at least 450 ° C, then maintaining at this temperature for at least 3 hours .
A titre d’exemple selon l’invention : dopage à l’aide de la composition catalytique selon l’invention By way of example according to the invention: doping using the catalytic composition according to the invention
Brûleur « Bl » (représenté sur la Fig 1 ) constitué d’un matériau poreux obtenu à partir de la composition C, et dont les faces 100, 101 et 102 du brûleur sont dopées par la composition catalytique selon l’invention les imprégnant. Burner "B1" (shown in FIG. 1) made of a porous material obtained from composition C, and the faces 100, 101 and 102 of the burner of which are doped with the catalytic composition according to the invention permeating them.
L’application de la composition catalytique sur les faces 100, 101 et 102 de l’embout du brûleur se faisant par imprégnation puis cuisson jusqu’à une température d’au moins 450°C, puis maintien à cette température pendant au moins 3 heures. The application of the catalytic composition on the faces 100, 101 and 102 of the burner nozzle is done by impregnation then baking to a temperature of at least 450 ° C, then maintaining at this temperature for at least 3 hours .
[0036] Flacon utilisé : Bottle used:
Celui représenté sur la Fig 2 pour les brûleurs « Bl » (selon l’invention) et « BC » (comparatif ou témoin). The one shown in Fig 2 for the burners "Bl" (according to the invention) and "BC" (comparison or control).
[0037] Mèche utilisée : Wick used:
Mèches en coton. Cotton wicks.
[0038] Liquide combustible utilisé : Combustible liquid used:
Alcool isopropylique. Isopropylic alcohol.
[0039] Tests et mesures Tests and measurements
Détermination des caractéristiques de fonctionnement des brûleurs Bl et BC installés sur le flacon 20, en présence d’un climatiseur à 18°C, avec ou sans ventilation : Determination of the operating characteristics of the burners Bl and BC installed on the bottle 20, in the presence of an air conditioner at 18 ° C, with or without ventilation:
Le protocole d’essais est représenté sur la Fig 5. Il consiste globalement à mesurer par thermographie infrarouge (IR) à l’aide d’une caméra thermique IR la température sur chacun des brûleurs testés (Bl et BC) en fonctionnement sur le flacon 20, placé à distance raisonnable d’un climatiseur (dont la puissance est de 800 W dans le cadre des essais réalisés), au niveau bas des Fig 4A et Fig 4B. Ces mesures sont par ailleurs comparées, pour chaque brûleur testé (témoin 1 C et selon l’invention 1 et 2), à des mesures réalisées sans ventilation. The test protocol is shown in Fig 5. It generally consists of measure by infrared thermography (IR) using an IR thermal camera the temperature on each of the burners tested (Bl and BC) operating on the bottle 20, placed at a reasonable distance from an air conditioner (whose power is 800 W as part of the tests carried out), at the low level of Fig 4A and Fig 4B. These measurements are also compared, for each burner tested (control 1 C and according to the invention 1 and 2), to measurements carried out without ventilation.
[0040] Les thermographies réalisées sont détaillées ci-après : The thermographies carried out are detailed below:
- Brûleur BC témoin : - Control BC burner:
Sans climatisation : Fig 3A, Without air conditioning: Fig 3A,
Avec climatisation : Fig 4A (vue de dessus). With air conditioning: Fig 4A (top view).
- Brûleur Bl traité selon le procédé selon l’invention : - Burner Bl treated according to the method according to the invention:
Sans climatisation : Fig 3B, Without air conditioning: Fig 3B,
Avec climatisation : Fig 4B (vue de dessus). With air conditioning: Fig 4B (top view).
[0041 ] La comparaison des thermographies des Fig 3A et Fig 3B, dans le cas d’une absence de climatisation, montre que la température de la zone centre de diffusion du brûleur diminue de 389°C (traitement avec la composition catalytique témoin) à 364°C lorsque l’on traite les faces 100, 101 et 102 de l’embout du catalyseur selon le procédé selon l’invention. The comparison of the thermographies of Fig 3A and Fig 3B, in the case of an absence of air conditioning, shows that the temperature of the central diffusion zone of the burner decreases by 389 ° C (treatment with the control catalytic composition) to 364 ° C when treating the faces 100, 101 and 102 of the tip of the catalyst according to the method according to the invention.
[0042] La comparaison des thermographies des Fig 3A et Fig 3B montre un effet similaire en présence d’une climatisation : la température de la zone centrale de diffusion du brûleur diminue de 357°C (pour un traitement avec la composition catalytique témoin) à 318°C lorsque l’on traite les faces 100, 101 et 102 de l’embout du catalyseur selon le procédé selon l’invention. The comparison of the thermographies of Fig 3A and Fig 3B shows a similar effect in the presence of air conditioning: the temperature of the central diffusion zone of the burner decreases by 357 ° C (for treatment with the control catalytic composition) at 318 ° C when treating the faces 100, 101 and 102 of the tip of the catalyst according to the method according to the invention.
[0043] Grâce à l’application selon le procédé de l’invention de la composition catalytique présentant une viscosité dynamique pc de 15 mPa.s. à 20°C, le catalyseur pénètre moins profondément à l’intérieur du brûleur, de sorte que la température de la zone centrale de diffusion du brûleur est moins élevée que si l’on avait appliqué la composition catalytique témoin. Thanks to the application according to the method of the invention of the catalytic composition having a dynamic viscosity p c of 15 mPa.s. at 20 ° C, the catalyst penetrates less deeply inside the burner, so that the temperature of the central diffusion zone of the burner is lower than if the control catalyst composition had been applied.

Claims

Revendications Claims
[Revendication 1 ] Procédé de dépôt d’un catalyseur à la surface d’un [Claim 1] Method for depositing a catalyst on the surface of a
brûleur à combustion catalytique, ledit brûleur à combustion catalytique étant constitué d’un matériau poreux et comprenant : catalytic combustion burner, said catalytic combustion burner being made of a porous material and comprising:
un embout (1 ) avec une partie supérieure (10) et une partie inférieure (1 1 ), ladite partie supérieure (10) présentant une paroi périphérique latérale comportant une face intérieure (100) délimitant une cavité, une face extérieure (101 ) de forme essentiellement cylindrique, et une face supérieure en forme de couronne (102), et a nozzle (1) with an upper part (10) and a lower part (1 1), said upper part (10) having a lateral peripheral wall comprising an inner face (100) delimiting a cavity, an outer face (101) of essentially cylindrical in shape, and a crown-shaped upper face (102), and
un manchon (2) disposé dans le prolongement de la partie inférieure (1 1 ) dudit embout (1 ), et comportant une cavité adaptée à enserrer une mèche destinée à amener au brûleur une composition combustible, a sleeve (2) disposed in the extension of the lower part (1 1) of said nozzle (1), and comprising a cavity adapted to enclose a wick intended to bring a combustible composition to the burner,
ledit procédé comprenant : said process comprising:
A) une étape d’imprégnation de ladite face extérieure (101 ) et, soit de ladite face intérieure (100), soit de ladite couronne (102) de l’embout (1 ), soit de ladite face intérieure (100) et de ladite couronne (102), par une composition catalytique contenant au moins un catalyseur appartenant aux groupes 9 ou 10 du tableau de classification périodique des éléments ; A) a step of impregnating said outer face (101) and either of said inner face (100) or of said crown (102) of the nozzle (1), or of said inner face (100) and of said crown (102), with a catalytic composition containing at least one catalyst belonging to groups 9 or 10 of the periodic table of the elements;
B) une étape de traitement thermique dudit brûleur ainsi imprégné du catalyseur jusqu’à une température Ta d’au moins 450°C ; B) a step of heat treatment of said burner thus impregnated with the catalyst up to a temperature Ta of at least 450 ° C;
ledit procédé étant caractérisé en ce que ladite composition catalytique est un fluide non newtonien présentant, avant application sur l’embout (1 ), une viscosité dynamique pc d’au moins 15 mPa.s. à 20°C. said process being characterized in that said catalytic composition is a non-Newtonian fluid having, before application to the nozzle (1), a dynamic viscosity p c of at least 15 mPa.s. at 20 ° C.
[Revendication 2] Procédé selon la revendication 1 , selon lequel ladite [Claim 2] The method of claim 1, wherein said
composition catalytique comprend : catalytic composition includes:
entre 1 % et 5 % en poids par rapport au poids total de la composition catalytique d’un catalyseur choisi parmi les métaux appartenant aux groupes 9 ou 10 du tableau de classification périodique des éléments, et entre 0,2% et 2% en poids par rapport au poids total de la composition catalytique d’un composé apte à augmenter la résistance à l’écoulement de ladite composition catalytique. between 1% and 5% by weight relative to the total weight of the catalytic composition of a catalyst chosen from metals belonging to groups 9 or 10 of the periodic table of elements, and between 0.2% and 2% by weight based on the total weight of the catalytic composition of a compound capable of increasing the flow resistance of said catalytic composition.
[Revendication 3] Procédé selon la revendication 2, selon lequel ledit [Claim 3] The method of claim 2, wherein said
composé est apte à augmenter la résistance à l’écoulement d’un polymère dérivé du glucose ou un polymère dérivé de l’oxyde d’éthylène. compound is capable of increasing the flow resistance of a polymer derived from glucose or a polymer derived from ethylene oxide.
[Revendication 4] Procédé selon l’une quelconque des revendications 1 à 3, selon lequel l’étape B) de traitement thermique comprend un maintien à la température Ta pendant au moins 3 heures. [Claim 4] Method according to any one of claims 1 to 3, according to which step B) of heat treatment comprises maintaining the temperature Ta for at least 3 hours.
[Revendication 5] Brûleur à combustion catalytique revêtu d’un catalyseur déposé conformément au procédé tel que défini selon l’une quelconque des revendications 1 à 4. [Claim 5] Catalytic combustion burner coated with a catalyst deposited in accordance with the process as defined in any one of Claims 1 to 4.
[Revendication 6] Flacon (20) à combustion catalytique, adapté à contenir un liquide combustible (30) et à recevoir au niveau de son goulot (50) un brûleur à combustion catalytique recevant une mèche (40) trempant dans ledit liquide (30), caractérisé en ce que ledit flacon (20) est équipé d’un brûleur (10) tel que défini selon la revendication 5. [Claim 6] Catalytic combustion bottle (20), adapted to contain a combustible liquid (30) and to receive at its neck (50) a catalytic combustion burner receiving a wick (40) soaking in said liquid (30) , characterized in that said bottle (20) is equipped with a burner (10) as defined in claim 5.
EP19829572.7A 2018-12-21 2019-12-19 Method for depositing a catalyst at the surface of a catalytic combustion burner Active EP3899368B1 (en)

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