EP2054667A1 - Composition a base de carbure de silicium pour bruleur a combustion catalytique en matiere poreuse - Google Patents
Composition a base de carbure de silicium pour bruleur a combustion catalytique en matiere poreuseInfo
- Publication number
- EP2054667A1 EP2054667A1 EP07823426A EP07823426A EP2054667A1 EP 2054667 A1 EP2054667 A1 EP 2054667A1 EP 07823426 A EP07823426 A EP 07823426A EP 07823426 A EP07823426 A EP 07823426A EP 2054667 A1 EP2054667 A1 EP 2054667A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- burner
- composition
- composition according
- porous material
- catalytic combustion
- 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
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 79
- 239000011148 porous material Substances 0.000 title claims abstract description 40
- 238000007084 catalytic combustion reaction Methods 0.000 title claims abstract description 27
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical group [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 9
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 9
- 150000001875 compounds Chemical class 0.000 claims abstract description 43
- 239000011230 binding agent Substances 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 230000002093 peripheral effect Effects 0.000 claims description 23
- 239000003054 catalyst Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000446 fuel Substances 0.000 claims description 10
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 8
- 229910052863 mullite Inorganic materials 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052878 cordierite Inorganic materials 0.000 claims description 4
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000003361 porogen Substances 0.000 claims description 4
- 239000004604 Blowing Agent Substances 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000005388 borosilicate glass Substances 0.000 claims description 3
- 239000011819 refractory material Substances 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 9
- 239000002304 perfume Substances 0.000 description 7
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- 230000006378 damage Effects 0.000 description 6
- 238000006555 catalytic reaction Methods 0.000 description 5
- 230000000844 anti-bacterial effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 238000013507 mapping Methods 0.000 description 3
- 235000019645 odor Nutrition 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- -1 silicon carbide Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 240000007049 Juglans regia Species 0.000 description 1
- 235000009496 Juglans regia Nutrition 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- VEMKTZHHVJILDY-UXHICEINSA-N bioresmethrin Chemical compound CC1(C)[C@H](C=C(C)C)[C@H]1C(=O)OCC1=COC(CC=2C=CC=CC=2)=C1 VEMKTZHHVJILDY-UXHICEINSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000009766 low-temperature sintering Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical class [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 235000020234 walnut Nutrition 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D3/00—Burners using capillary action
- F23D3/40—Burners using capillary action the capillary action taking place in one or more rigid porous bodies
-
- 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
- F23D2900/05002—Use of porous members to convert liquid fuel into vapor
-
- 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 of catalytic combustion burners porous material.
- these burners are used for the diffusion of perfume, for the destruction of molecules, odorous or not, and / or for the purification of the air.
- the perfume is in a solvent, which is often an alcohol, and for example isopropyl alcohol.
- Fragrance diffusers comprising these burners must ensure a good diffusion of the perfume and the solvent which may have a bactericidal activity.
- the invention relates, according to a first aspect, to a composition for obtaining a porous material intended for the manufacture of a catalytic combustion burner or a catalytic combustion burner element, comprising at least one at least one refractory compound, at least one binder, and at least one pore-forming agent.
- compositions are known in particular from the examples given in EP 0 277 875, EP 1 084 367, EP 1 491 819 and EP 1 491 819.
- compositions are based on a mineral ceramic refractory material, such as cordierite or kaolin.
- the burners used today and based on such materials do not have constant physical, chemical and mechanical properties from one burner to another and homogeneous within the same burner, in particular because the materials used are neither controlled nor controlled, and that the manufacture of the burners is complex and is not constant due to the non-constancy of the powders.
- the mapping of the temperatures of the catalysis and diffusion zones is not well controlled and is therefore not entirely satisfactory.
- the temperature of the diffusion zone • is not constant and can reach a temperature of 250 degrees Celsius.
- Such a temperature of the diffusion zone can cause the deterioration of the olfactory quality of the perfume diffused because of the destruction of the light molecules.
- the bactericidal efficacy can also be impaired because of a diffusion in solvent, such as isopropyl alcohol, less important.
- the ideal temperature for the diffusion zone is around 200 degrees Celsius (160 to 230 degrees Celsius).
- This temperature must not be lower either. Too low a temperature of the diffusion zone can be detrimental in that the diffusion of high molecular weight molecules, such as certain perfume molecules or pyrethroids, is no longer properly ensured.
- the temperature of the catalysis zone is between 450 and 540 degrees Celsius, to allow not only good combustion, but also the destruction of atmospheric molecules, odorous or not, which would circulate near this area.
- the present invention aims to provide a composition free from at least one of the limitations mentioned above.
- the composition of the invention for obtaining a porous material for the manufacture of a catalytic combustion burner or a catalytic combustion burner element, comprising at least one Refractory compound, at least one binder, and at least one pore-forming agent is essentially characterized in that it further comprises at least one thermal conductive compound of thermal conductivity greater than 60 watts per meter-Kelvin (W / mK).
- the invention has the advantage of providing a composition whose properties and quality are controlled, and can be used for any form of burner. Therefore, the burners or burner elements made from this composition have homogeneous physical, chemical and mechanical properties throughout their volume and reproducible properties from one burner, or burner element, to another. At least one of the thermal conductive compounds is, for example, silicon carbide.
- each refractory compound has a thermal conductivity lower than the thermal conductivity of each thermal conductive compound.
- Each refractory compound may in particular be chosen from alumina, silica, mullite, zirconia, cordierite, or a mixture thereof.
- the refractory compound is most preferably mullite.
- each binder is chosen from any mineral compound allowing sintering at a temperature of less than or equal to 1000 degrees Celsius.
- the binder is for example glass, preferably borosilicate glass.
- Each pore-forming agent is advantageously chosen from any porogen with a controlled and controlled particle size distribution.
- the blowing agent is, for example, graphite.
- the composition comprises, as a percentage of its total weight, between 5 and 30% of at least one thermal conductive compound, between 30 and 70% of at least one refractory compound, and and 30% of at least one binder, and between 5 and 40% of at least one pore-forming agent.
- the composition comprises, as a percentage of its total weight, between 8 and 25% of at least one thermal conductive compound, between 40 and 65% of at least one refractory compound, between 5 and 25% of at least one binder, and between 8 and 35% of at least one pore-forming agent.
- the invention also relates to a porous material for the manufacture of a catalytic combustion burner or a catalytic combustion burner element, comprising at least one refractory compound, at least one binder, and at least one porogenic agent, characterized in that it further comprises at least one heat conductive compound.
- the invention also relates to a catalytic combustion burner or catalytic combustion burner element made of a porous material, obtained from a composition according to the invention.
- the burner comprises at least one tip made of porous material having an upper end wall and a lateral peripheral wall defining together a cavity extending along a main axis and opening through a lower opening, this tip being intended to cap an upper end of a wick engaged in the cavity in a first direction and adapted to imbibe the tip of a fuel composition, this tip further having an upper face formed of a central zone and a peripheral zone separated from each other by an annular groove dug in the nozzle in a second direction opposite to the first, the peripheral wall having an external lateral face of which at least a portion is doped by a catalyst, and the central zone of the upper face being free of catalyst, the groove being delimited by inclined lateral faces with respect to the main axis and diverging from each other in the first direction.
- the nozzle advantageously includes first and second distinct elements, which are respectively a head formed of the nozzle -exempt of central zone and an insert forming said central zone, and which consist respectively of a first and a second porous material, said porous materials being each obtained from a composition according to the invention.
- the cavity of the nozzle extends at the level of the lower opening by a cavity of a sleeve of porous material and adapted to grip the wick, said sleeve consisting of a third porous material obtained from a composition according to the invention.
- the burner, or burner element, according to the invention advantageously include pores all having about the same diameter, said diameter being at least equal to 5 microns.
- the lateral peripheral wall of the burner according to the invention advantageously has a support edge adapted to be supported by a support device, said support edge including at least one hollow zone adapted to define an air passage at the periphery of the burner.
- All burner or burner element regardless of its shape can be manufactured advantageously • from the composition of the invention.
- Some known burner structures, which could advantageously be manufactured from the composition according to the invention, are for example those described in documents EP 0 277 875, EP 1 084 367, EP 1 491 819 and EP 1 491 819.
- FIG. 1 shows schematically a cross section of a particular burner
- FIG. 2 shows schematically a cross section of a particular burner
- FIG. 3 shows a perspective view of a particular burner
- FIG. 4A shows a schematic top view of an insert of a particular burner
- Figure 4B shows perspective views of this insert
- FIG. 5 schematically shows a cross section of a particular burner.
- the burner is manufactured with a composition according to the invention and according to a new structure represented by way of example in FIGS. 1 to 5.
- the catalytic combustion burner shown in FIG. 1 comprises a tip 1 made of porous material obtained for example from the composition according to the invention.
- the tip 1 has an upper end wall 2 and a lateral peripheral wall 3, which together define a cavity 4 extending along a main axis 5 and opening through a lower opening 6.
- the diameter of this cavity 4 is advantageously between 5 and 9 millimeters, preferably between 6 and 8.5 millimeters. .
- the tip 1 is intended to cap an upper end of a wick engaged in the cavity 4 in a first direction 7 and adapted to imbibe the tip 1 of a fuel composition.
- This tip 1 further has an upper face 8 formed of a central zone 9 and a peripheral zone
- the peripheral wall 3 has an external lateral face 12 of which at least a portion is doped by a catalyst. According to a preferred embodiment of the invention, at least the lower quarter of the side face 12 is free of catalyst. Most preferably, the portion of the lateral surface 12 free of catalyst corresponds to a lower part of this face 12, having a height of between one-third and one-half the height of the lateral face 12.
- the. central zone 9 of the upper face 8 is free of catalyst, which limits the temperature in this area at which the molecules of the composition to be diffused are not destroyed.
- the groove 11 is delimited by lateral faces 13a and 13b inclined with respect to the main axis 5 and diverging from one another in the first direction 7.
- the lateral faces 13a and 13b of the groove 11 are separated by an angle ⁇ (alpha) between 30 and 40 degrees.
- the annular groove 11 is delimited more precisely by a central lateral face 13a and a peripheral lateral face 13b.
- An advantageous configuration of the burner is that in which the inclination of the central lateral face 13a and the peripheral lateral face 13b with respect to the main axis 5 is respectively 19 and 16 degrees, more or less 2 or 3 degrees.
- the annular groove 11 advantageously has a depth P of between 30 and 55%, preferably between 40 and 50%, of the height H of the tip 1.
- the tip 1 has a height H - between 10 and 15 millimeters and the groove has a depth P between 4.5 and 7.5 millimeters.
- the burner has a nozzle 1 including first and second distinct elements 1a and
- the head la and the insert Ib are each made of a porous material obtained for example from the composition according to the invention.
- the head la and the insert Ib are made from the same composition.
- the porosity of the insert Ib is slightly lower than that of the head 1a.
- the first and second elements 1a and 1b preferably have at least one contact surface 14, 15 with each other. This surface 14, 15 of contact allows the direct passage of the pore fluids of the first element la to those of the second element Ib.
- FIG. 2 two contact surfaces between the first and second elements, a first horizontal contact surface 14 and a second contact surface 15 between the central lateral faces 13a and peripheral 13b of the groove 11.
- the cavity 4 is formed in the first element 1a and in the second element Ib.
- the second element Ib does not include a portion 4b of the cavity 4.
- the tip 1 may comprise at least one open channel 16 communicating the cavity 4 with the atmosphere.
- a burner with such a channel 16 is described in EP '1 084 367. . .
- the presence of the channel 16 makes it possible to further facilitate the cooling of the central zone 9, and thus to obtain an ideal temperature in this zone 9 and also in the peripheral zone 10.
- the open channel 16 prevents the end of the wick carbonizes in the burner.
- recesses 17a and 17b may be provided at the end of the nozzle 1. They may be located at the side faces 13a and 13b of the groove 11 and / or a front surface 18 of the central zone 9.
- the central lateral face 13a of the groove 11 includes recesses, in order to cause a drop in the temperature of the central zone 9 by contact with atmospheric air.
- the front surface 18 of the central zone 9 may also include at least one recess.
- it includes a recess 17a as shown in Figure 3, which can be used to position a bracket for the possible maintenance of the burner on a support.
- the recesses occupy a surface area of at least 5%, generally between 5 and 80%, advantageously between 10 and 60%, and preferably between 25 and 45%, of a total surface area represented by the face.
- FIG. 4 an insert Ib comprising particular recesses is shown in FIG. 4.
- the insert Ib is essentially frustoconical in shape.
- the particular recesses 17b are lateral grooves formed on the periphery of the insert Ib representing the central lateral face 13a of the groove 11.
- a recess in the form of a front groove 17a is also present on the top of the insert.
- Ib representing the front surface 18 of the central zone 9, and may be useful for positioning a stirrup.
- the lateral grooves 17b are eight in number. They are hollowed out in an insert Ib of the order of 12 millimeters of larger diameter and about 6 millimeters in height, by describing an arc of a circle of radius equal to 0.75 millimeters. A 45 degree angle separates each groove 17b from each adjacent groove 17b.
- the tip 1 also comprises an open channel 16.
- the peripheral zone 10 has a front surface 19 free of catalyst.
- the burner of Figure 5 comprises a sleeve 20 of porous material obtained for example from a composition according to the invention and adapted to grip the wick.
- This sleeve 20 has a cavity 4 'located in the extension of the cavity 4 of the nozzle 1.
- Such a sleeve is described in patent EP 1 491 819.
- the sleeve 20 is made of a material identical to or different from each material which constitutes the tip 1.
- the head 1a, the insert Ib and the sleeve 20 are preferably made from the same composition but can also be manufactured from two or three compositions, according to the invention or not, different.
- the sleeve 20 covers at least 5%, preferably between 5 and 40%, and more preferably between 7 and 20%, of the length of the lock.
- the cavity 4 ' is adapted to receive the wick.
- the diameter of this cavity 4 ' is advantageously between 5 and 9 millimeters, preferably between 6 and 8.5 millimeters.
- a sleeve 20 is advantageous for regulating the supply of fuel composition to the nozzle 1, in particular whatever the level of fuel composition in which the wick is soaked.
- the outer lateral face 12 of the tip 1 is inclined at least a portion of its height relative to the main axis 5, the inclination being such that the diameter of the tip 1 increases in the first direction 7.
- the inclination is advantageous in that it makes it possible to increase the contact time of the atmospheric air with the catalysis zone and thus to facilitate the destruction of molecules present in this air and responsible, for example, for bad odors.
- the outer lateral face 12 comprises at least one shoulder 21.
- a shoulder 21 may for example separate the outer lateral face 12 into a high portion doped by the catalyst and a low portion free of catalyst. The presence of this shoulder is therefore advantageous especially at the time of manufacture of the burner to delimit the portion on which the catalyst must be deposited.
- the outer lateral face 12 of the nozzle 1 has the configuration as shown in the figures.
- the outer lateral face 12 has a shoulder 21.
- the outer lateral face 12 comprises an inclined wall 3a below a straight wall 3b, itself below. the front surface 19 of the peripheral zone which can be slightly inclined or horizontal.
- an inclined wall and the advantages thereof are preserved and include a straight wall which may have, according to the deposition technique used, the advantage of facilitating the deposition of catalyst.
- this particular configuration is advantageous for the manufacture of the burner in that it facilitates demolding.
- the front surface 19 of the peripheral zone 10 is advantageously free of catalyst. Atmospheric air, depending on the convection movements that are created naturally around the tip 1 of the burner, normally comes in very little contact with the front surface 19 of the peripheral zone 10.
- the catalyst optionally deposited on this surface 19 is therefore of little use to the action of the burner, and this deposit is rather a loss of catalyst and therefore is not economical.
- the presence of catalyst on this surface 19 may cause undesirable warming of the central diffusion zone 9.
- the composition according to the invention comprises at least one refractory compound at least one binder, at least one pore-forming agent, and at least one thermal conductive compound having a thermal conductivity greater than 60 watts per meter Kelvin. It is chosen for example from silicon carbide SiC or aluminum nitride AlN.
- Each refractory material according to the invention has a thermal conductivity lower than the thermal conductivity of each thermal conductive compound, for example that of SiC which is between 60 and 160 watts per meter-Kelvin, and more particularly between 63 and 155 watts per second. meter-kelvin.
- the refractory material is preferably mullite.
- the mullite may for example be replaced by or mixed with alumina, silica, zirconia, cordierite, or a mixture thereof.
- Silica is preferably introduced into the composition of the invention in admixture with another refractory compound.
- the refractory compound in addition to its good mechanical behavior at high temperature, plays a major role of insulator within the porous material obtained from the composition according to the invention.
- Each binder is selected from any mineral compound allowing sintering at a temperature less than or equal to 1000 degrees Celsius.
- the binder is advantageously glass having a variable silica percentage, more particularly an ordinary oxide-based glass, for example including about 70% of silica and about 30% of calcium and sodium oxides, or a glass special including oxides of various elements such as boron or phosphate, for example a borosilicate glass.
- the binder improves the formability, provides the mechanical cohesion of a piece and allows to obtain a porous and mechanically resistant material.
- the binder is chosen in particular from low temperature sintering compounds, i.e. the compounds for sintering the composition in which they occur at this temperature, typically less than or equal to 1000 degrees Celsius.
- low temperature sintering compounds i.e. the compounds for sintering the composition in which they occur at this temperature, typically less than or equal to 1000 degrees Celsius.
- the glass softens and wets the particles of thermal conductive compound. A glassy phase is obtained. Then, when the temperature drops, the particles are bonded together by solidification of the glassy phase.
- Each blowing agent is preferably chosen from any porogen, such as graphite, sawdust, crushed walnut, or starch, the particle size of which is controlled and controlled.
- the pore-forming agent is for example all synthetic porogenous, but also all natural porogen whose particle size is controlled and controlled, in particular especially during his. manufacture and storage.
- the composition according to the invention comprises, as a percentage of its total weight, between 5 and 30%, preferably between 8 and 25%, most preferably between 10 and 20%, of at least one thermal conductive compound. .
- the composition according to the invention comprises, in percentage of its total weight, between 30 and 70%, preferably between 40 and 65%, most preferably between 48 and 58%, of at least one refractory compound. .
- the composition according to the invention comprises, as a percentage of its total weight, between 2 and 30%, preferably between 5 and 25%, most preferably between 8 and 20%, of at least one binder.
- the composition according to the invention comprises, as a percentage of its total weight, between 5 and 40%, preferably between 8 and 35%, most preferably between 18 and 25%, of at least one porogenic agent.
- a particularly preferred composition according to the invention comprises, as a percentage of its total weight, between 48 and 58% of mullite, between 10 and 20% of SiC, between 8 and 20% of glass, and between 18 and 25% of graphite.
- the thermal conductive compound such as silicon carbide, has a particle size less than or equal to 100 microns.
- Particle size means a median diameter (d ⁇ o) determined according to a laser diffraction gra ⁇ ulometric analysis.
- the median diameter is defined by the geometric mean of the particle distribution.
- the refractory compound such as mullite, has a particle size less than or equal to 250 micrometers.
- the binder such as glass, has a particle size less than or equal to 50 microns.
- the pore-forming agent has a particle size of at least 50 microns.
- the choice of particle size of the powders used for the composition according to the invention in particular influences the pore size of the final material.
- the porous material obtained from the composition according to the invention and intended for the manufacture of a catalytic combustion burner or of a catalytic combustion burner element, comprises at least one refractory compound, at least one binder, and at least one porogenic agent, characterized in that it further comprises at least one thermal conductive compound.
- the composition of the invention is a composition for obtaining a porous material for the manufacture of a catalytic combustion burner or a catalytic combustion burner element.
- the burner element is for example a nozzle 1, a head la, an insert Ib, or a sleeve 20.
- a burner or a burner element of porous material is for example obtained in a conventional manner by pressing a composition according to the invention, then sintering the pressed composition.
- the composition according to the invention has the advantage of allowing the production of a porous material whose characteristics are controlled. Unlike the prior art, these characteristics are homogeneous within the same burner or a burner element and are reproducible from one burner or burner element to another.
- the pore diameter is for example better controlled than in the prior art.
- the porosity of the burner is also an important characteristic in that it determines in particular the circulation of fluids within this burner, the control of which is permitted by the use of the composition according to the invention. Porosity is expressed as a percentage of volume of the voids, or pores, of the material in relation to its total volume. It is determined by the method of Archimedes' push.
- the composition according to the invention makes it possible to obtain a burner including pores all having approximately the same diameter, and distributed in a homogeneous manner.
- the pore diameter, determined by mercury porosity is for example at least 5 microns, generally between 5 and 22 microns, preferably between 7 and 20 microns, and most preferably between 9 and 15 microns.
- the porosity of the head and the sleeve is at least equal to 45%, preferably between 45 and 75%, advantageously between 50 and 70%, and most preferably between 52 and 62%, and the porosity of the insert is at least 35%, preferably between 35 and 80%, advantageously between 40 and 70%, and most preferably between 50 and 60%.
- the invention also has the advantage of providing a burner in which the mapping of the temperatures of the diffusion and catalysis zones is better controlled.
- the invention makes it possible to obtain very good diffusion performances.
- the bactericidal efficacy is at least equal to that of the burner described in patent EP 1 084 367, and the olfactory quality is improved.
- the molecules, odorous or not, present in the atmospheric air are better destroyed and the perfume molecules of the combustible composition are better diffused.
- the olfactory quality is improved thanks to a greater control of the central temperature and its maintenance at about 200 ° C. In particular, the light notes are more noticeable.
- the bactericidal efficacy is maintained at about 68% as for burners made from the compositions of the prior art based on mineral material.
- the temperature of the catalytic zone is controlled. In particular, it can be maintained at a temperature of about 500 degrees Celsius. For comparison, in the burner described in EP 1 084 367, the temperature of the catalytic zone is 450 degrees Celsius.
- the destruction of odors has a greater abatement.
- the efficiency of odor destruction for example on a smoky atmosphere is 1.5 times greater than that obtained for burners made from the compositions of the prior art based on mineral material.
- the side peripheral wall 3 has a bearing edge 22 adapted to be supported by a support device.
- This support edge 22 advantageously comprises at least one hollow zone 23 suitable for defining an air passage at the periphery of the burner.
- Each hollow zone 23 is in any form of cut, for example in the form of crenellations or grooves, and whose possible angles are straight or rounded.
- the hollow zones 23 shown in FIGS. 2 and 3 by way of example are slots at right angles.
- the nozzle 1 of the burner has a total surface of lateral peripheral wall 3 in a sectional plane passing through the support edge 22, and at least one hollow zone 23 seen in section. according to this section plane has a total air passage area at least equal to 10% of the total area of the lateral peripheral wall 3.
- the hollow zone or zones 23 occupy for example a total angle of at least 35 degrees, preferably a total angle of between 35 and 290 degrees, most preferably between 70 and 255 degrees, or even more preferably between 100 and 220 degrees, at the periphery of the burner.
- the burner may include three hollow zones 23 distributed regularly around the periphery of the burner at its support edge 22.
- Each vent or hollow zone 23 occupies a 60 degree angle at the periphery of the burner.
- the three hollow zones 23 are each separated from each other by 60 degrees.
- the support device adapted to receive a burner according to the invention includes a container comprising a neck forming a burner passage opening.
- the support device includes at least one separate part of the container. At least one of these parts is positioned in the neck. The neck and / or at least one of these parts comprise the burner passage opening.
- the support device may for example include a container, a neck, a base and / or a support means.
- the container is likely to contain a clean fuel composition to soak the burner via a wick.
- the support device includes a metal support means adapted to receive the burner, installed on a metal base in the neck of the container.
- the hollow area of the burner then defines an air passage between an interior volume of the container and a volume outside the burner assembly - support device.
- the invention has the advantage of allowing the implementation of a catalytic combustion assembly with one or more vents that allow an air passage between the burner and any support device. A natural ventilation is thus created, making it possible to improve in. operating the evacuation of the gases accumulated in the container containing the fuel composition.
- the absence of contact between the support device and the burner at the hollow zone allows an air passage between the two elements and therefore their cooling at the location and around the hollow zone, which participates the respect of the temperature mapping within the burner.
- the presence of hollow zones 23 on a burner comprising a sleeve 20 is particularly advantageous. Indeed, the presence of this sleeve 20 leads to a greater heat conduction in operation in a container. • The hollow zones 23 allow a circulation of air limiting this heat conduction to the container and promoting the evacuation of the gases accumulated in this container.
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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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0607472A FR2905164B1 (fr) | 2006-08-23 | 2006-08-23 | Composition a base de carbure de silicium pour bruleur a combustion catalytique en matiere poreuse. |
PCT/FR2007/001375 WO2008023111A1 (fr) | 2006-08-23 | 2007-08-16 | Composition a base de carbure de silicium pour bruleur a combustion catalytique en matiere poreuse |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2054667A1 true EP2054667A1 (fr) | 2009-05-06 |
EP2054667B1 EP2054667B1 (fr) | 2016-12-07 |
Family
ID=37890296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07823426.7A Active EP2054667B1 (fr) | 2006-08-23 | 2007-08-16 | Composition a base de carbure de silicium pour bruleur a combustion catalytique en matiere poreuse |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2054667B1 (fr) |
FR (1) | FR2905164B1 (fr) |
WO (1) | WO2008023111A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2950257B1 (fr) | 2009-09-22 | 2012-01-20 | Prod Berger | Ensemble pour la diffusion d'une composition dans l'air |
TWI426934B (zh) * | 2010-10-04 | 2014-02-21 | Prod Berger | 用以將組成物散佈於空氣之總成 |
GB201321309D0 (en) * | 2013-12-03 | 2014-01-15 | Ashleigh & Burwood | A Catalytic fragrance burner assembly and a method of manufacture thereof |
FR3061543B1 (fr) * | 2016-12-30 | 2019-08-23 | Produits Berger | Bruleur a combustion catalytique en materiau poreux a performances de fonctionnement optimisees et flacon equipe d'un tel bruleur |
FR3061544B1 (fr) * | 2016-12-30 | 2019-08-23 | Produits Berger | Bruleur a combustion catalytique en materiau poreux a performances de fonctionnement optimisees et flacon equipe d'un tel bruleur |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2610390B1 (fr) * | 1987-01-29 | 1990-09-07 | Berger Sa Produits | Bruleur a combustion catalytique |
US6585509B2 (en) * | 1995-05-10 | 2003-07-01 | Allports Llc International | Vaporization and pressurization of liquid in a porous material |
EP0798393B1 (fr) * | 1996-03-29 | 2001-11-21 | Hitachi Metals, Ltd. | Procédé de préparation d'un alliage composite en aluminium à faible coefficient de dilatation thermique et à haute conductivité thermique |
CN1392219A (zh) * | 2001-06-15 | 2003-01-22 | 独立行政法人产业技术综合研究所 | 高热导性复合材料及其制备方法 |
DE10325574A1 (de) * | 2003-06-05 | 2004-12-30 | J. Eberspächer GmbH & Co. KG | Brennkammeranordnung für einen Verdampferbrenner, insbesondere für ein Fahrzeugheizgerät |
FR2856775B1 (fr) * | 2003-06-27 | 2005-08-19 | Prod Berger | Bruleur a combustion catalytique en matiere poreuse et flacon equipe d'un tel bruleur |
-
2006
- 2006-08-23 FR FR0607472A patent/FR2905164B1/fr active Active
-
2007
- 2007-08-16 WO PCT/FR2007/001375 patent/WO2008023111A1/fr active Application Filing
- 2007-08-16 EP EP07823426.7A patent/EP2054667B1/fr active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008023111A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2905164B1 (fr) | 2012-12-21 |
EP2054667B1 (fr) | 2016-12-07 |
WO2008023111A9 (fr) | 2008-07-10 |
WO2008023111A1 (fr) | 2008-02-28 |
FR2905164A1 (fr) | 2008-02-29 |
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