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.

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• 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)

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Publications (1)

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Family Applications (1)

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Citations (4)

Family Cites Families (21)

• 2018
  • 2018-12-21 FR FR1873930A patent/FR3090420B1/fr active Active
• 2019
  • 2019-12-19 ES ES19829572T patent/ES2971889T3/es active Active
  • 2019-12-19 EP EP19829572.7A patent/EP3899368B1/fr active Active
  • 2019-12-19 JP JP2021534807A patent/JP7483714B2/ja active Active
  • 2019-12-19 CA CA3121598A patent/CA3121598A1/fr active Pending
  • 2019-12-19 CN CN201980082868.1A patent/CN113195975B/zh active Active
  • 2019-12-19 WO PCT/EP2019/086486 patent/WO2020127848A1/fr unknown
  • 2019-12-19 US US17/416,215 patent/US20220042677A1/en active Pending
  • 2019-12-19 KR KR1020217019314A patent/KR102658559B1/ko active IP Right Grant
  • 2019-12-20 TW TW108147104A patent/TWI731522B/zh active

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