EP0683882B1 - Dispositif de vaporisation de combustibles et d'alimentation en air de combustion - Google Patents

Dispositif de vaporisation de combustibles et d'alimentation en air de combustion Download PDF

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Publication number
EP0683882B1
EP0683882B1 EP94905823A EP94905823A EP0683882B1 EP 0683882 B1 EP0683882 B1 EP 0683882B1 EP 94905823 A EP94905823 A EP 94905823A EP 94905823 A EP94905823 A EP 94905823A EP 0683882 B1 EP0683882 B1 EP 0683882B1
Authority
EP
European Patent Office
Prior art keywords
fuel
air
nozzle
chamber
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.)
Expired - Lifetime
Application number
EP94905823A
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German (de)
English (en)
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EP0683882A1 (fr
Inventor
Winfried Jean Werding
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.)
Verbena Corp NV
Original Assignee
Verbena Corp Nv Werding Winfried Jean
Werding Winfried Jean
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
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Publication of EP0683882A1 publication Critical patent/EP0683882A1/fr
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Publication of EP0683882B1 publication Critical patent/EP0683882B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/001—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space spraying nozzle combined with forced draft fan in one unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/02—Disposition of air supply not passing through burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/006—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
    • F23D11/101—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet
    • F23D11/102—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet in an internal mixing chamber
    • F23D11/103—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet in an internal mixing chamber with means creating a swirl inside the mixing chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/02—Liquid fuel
    • F23K5/04—Feeding or distributing systems using pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/02—Liquid fuel
    • F23K5/14—Details thereof
    • F23K5/18—Cleaning or purging devices, e.g. filters

Definitions

  • the present invention relates to a device for the evaporation of fuels, consisting of a nozzle unit, the one via a fuel feed pump and over a fuel line fuel and separated from it over an air generator and air is added via an air line is, the nozzle unit having a longitudinal axis and has a chamber mounted perpendicular to it, into which the fuel and air through feed channels for mixing is promoted, the feed channels for the Fuel flow tangentially into the chamber, and the Fuel in the chamber thereby in a to the longitudinal axis noticeable vertical rotation offset is and wherein the mixture is expelled through a nozzle channel becomes.
  • the heating oils contain i.a. Chlorine and sulfur, the proportion of sulfur all the more is higher, the heavier the heating oil is and can 3.5 wt. % to reach.
  • the main problem with current heating systems is that Particle size of the atomized heating oil, which, by means of a Atomization pressure of approx. 15 bar to 80% between 40 and 80 Micron lies.
  • the heavy heating oils In order to reduce the viscosity of the heavy heating oils, they are heated to 50 ° C to 100 ° C, which is the particle size influenced, but not enough to to bring about maximum combustion, not to mention that heating the heating oil consumes large amounts of energy.
  • French Patent No. 903 293 describes a device which has the features of the preamble of Claim 1 includes.
  • the device has a nozzle unit on which with concentrically arranged feed channels is equipped for fuel and gas that is tangential directed channels open into a vortex chamber the fuel-gas mixture by means of a nozzle channel is expelled. Both the gas and the fuel are fed tangentially into the chamber, where they are rotating. Because the gas and the Fuel and have the same direction of movement move more or less parallel next to each other, can not be fine and continuous through this arrangement Mixing of fuels and gas can be achieved what has a negative effect on the particle size when exiting and excludes optimal combustion.
  • French Patent No. 809 455 the fuel and the air together via helicoid Grooves in the nozzle unit directed to the discharge channel. Also here fuel and air are mixed only moderately well. In addition, there are no means provided here for the compressed air in the fuel can compress what for Evaporation of fuel is very important.
  • the present invention is based on the object to remedy these disadvantages of the known device and Vaporizing fuels instead of atomizing them, whereby the smallest possible particle size can be achieved.
  • this object is achieved by a device for the evaporation of fuels and the Feeding of combustion air as defined in claim 1 is solved.
  • the air used for evaporation at the same time one Part of the combustion air, being by an ultrafine Particle size a faster evaporation and thus better combustion is brought about and thus the undesirable residues, especially the NOx, can be limited.
  • the device according to the invention is based on a device for atomizing liquids with the addition of compressed gas, which with a pressure of only 1 bar a SAUTER-mean particle size from 21.08 micron.
  • a SAUTER-mean particle size from 21.08 micron.
  • the particle size is reduced significantly, so that one can speak of evaporation.
  • This evaporation is the basis of the inventive Device and ensures optimal combustion.
  • Fig. 1 shows a nozzle sleeve 1 in which a nozzle core 2 is stored, which has a mixing chamber 3, in which compressed bores 4 lying parallel to the core axis Air and via feed channels 5 and tangential channels 6 (see also Fig. 2) pressurized heating oil flows in, so that the heating oil and the compressed Can mix air there.
  • the nozzle sleeve 1 has an expansion chamber 7, a compression chamber 8 and a nozzle channel 9.
  • the depth of the expansion chamber 7 and the compression chamber 8 determine the length of the nozzle channel 9, a short nozzle channel 9 gives off a wider cone than a long one.
  • 4 shows a conical Nozzle channel 10, which gives off an even wider cone than an equally long but cylindrical nozzle channel 9.
  • Die Diameters of the nozzle channels 9 and 10 determine the amount of heating oil that is emitted per unit of time: with the same Pressure is small with a small diameter, being but the diameter of the nozzle channels 9 and 10 is not smaller than 0.30 mm and since you can use the evaporating air clean, they remain constant throughout.
  • the feed channels 5 of the nozzle core 2 open into the tangential channels 6, which open into the mixing chamber 3, so that one of the feed channels 5 and the tangential channels 6 incoming heating oil is pushed into the mixing chamber 3 is that there is a rotating motion along its wall into which the compressed air is transferred the hole 4 is pressed vertically, whereby it then after a first compression phase in the mixing chamber 3 can relax in the expansion chamber 7 afterwards highly compressed in the heating oil in the compression chamber 8 to become.
  • FIG. 5 shows another embodiment of a nozzle unit, from a nozzle sleeve 11 and a nozzle core 12 existing, which is used especially for fuels, where the nozzle unit is the viscosity of the heating oil must be adjusted exactly, e.g. with heavy heating oils. If the nozzle unit of FIG. 1 had a viscosity of more than 10 centipoises, the Modifications to both the feed channels 5, the tangential channels 6 and the mixing chamber 3 of the nozzle core 2, such as also take place on the expansion chamber 7 of the nozzle sleeve 1. 5 are the modifications easier.
  • the feed channels 13 are located and the tangential channels 14 in the nozzle sleeve 11, wherein the tangential channels 14 open into the compression chamber 15, which has the nozzle channel 16.
  • the air gets over Bores 18 into the mixing chamber 17, which with the Compression chamber 15 communicates. Do you want this Adjusting the nozzle unit to a higher viscosity is enough it to keep the mixing chamber 17 of the nozzle core 12 lower and enlarge the diameter of the holes.
  • a pressure vessel 19 In the pressure vessel 19 there is a float 23 with a needle 24.
  • Der Lid 20 is with a pressure relief valve 25 and Air outlet 26 provided.
  • At the bottom of the pressure vessel 19 there is a heating oil inlet 27, a heating oil return 28, which is temporarily closed with the needle 24 and the Heating oil outlet 29.
  • a heating oil, not shown, is by means of a pump 30 is conveyed into the pressure vessel 19, while at the same time the compressor 21 the pressure vessel 19 sets at atmospheric pressure, the amount of pressure with the pressure relief valve 25 is adjustable.
  • the Float 23 pulls the needle 24 out of the return 28 as soon as a predetermined amount of heating oil in the pressure tank 19 so that the excess heating oil is returned to the intake pipe the pump 30 flows back.
  • the nozzle sleeve 1 (11) with the nozzle core 2 (12) is in a distributor block 31. This is via the air outlet 26 and a solenoid valve 32 supplied with compressed air, the volume of which with a Needle valve is adjustable.
  • the heating oil is, under identical Pressure like the air, over the heating oil outlet 29 and a solenoid valve 34 pressed into the distributor block 31, the fuel oil volume using a needle valve 35 is adjustable.
  • the distributor block 31 carries a hollow combustion cylinder 36, in the direction of escape of the nozzle axis is provided with a sieve 37 and side holes 38 has, with a slide 39 more or less are closable. Secondary combustion air, coming from a blower 40, in the hollow cylinder 36 and thus in the vaporized, already fuel oil enriched with primary combustion air, blown will.
  • the pressure relief valve 25 can consist of a membrane, which is located in an electrical by means of a magnetic core Coil lifts under a preset current and excess pressure can escape, such a design, provided with a potentiometer that the current of the The spool controls makes it easier to adjust the pressure level essential as there is only a change in current in the coil needed to resist the resistance of the membrane to increase or decrease the pressure.
  • An essential one The advantage of this solution is that the amount of heating oil per unit of time using the pressure in the pressure vessel 19 can be infinitely adjusted without reducing the particle size to change significantly.
  • Fig. 9 shows without taking any scale into account wear, an extremely advantageous embodiment of the inventive Contraption.
  • the main difference, compared 8 is that the Hollow cylinder 36 with, in this embodiment, nine tubes 41 is replaced, the free ends 42 are closed.
  • the Tubes 41 have bores 43 and a blower 44 fills the tubes 41 with compressed air, which via the bores 43 is blown into a flame, not shown. thanks a thread 45 with which the tubes 41 in a distribution plate 46 screwed and blocked by nuts 47, it is possible to blow the bores 43 as desired set, i.e., the one coming from the blower 44 Air can enter both the axis of the flame, as well or less tangent to it, blown, to specifically control a swirl. You can too thus a mixture of axis blowing direction and tangential blowing direction to reach.
  • the bores 43 one tube 41 is offset from that of another tube 41 be attached.
  • FIG. 9 shows two different ways.
  • the housing 49 of the blower 44 has openings 50 which are connected by means of a sleeve 51 are shielded from the outside air.
  • a sleeve 51 is shielded from the outside air.
  • the exhaust gases are via outer tubes 53 which are provided with holes 54, and openings 50 of the housing 49 sucked in and in the manner described in the Blown flame.
  • Supply of secondary combustion air via the tubes 41 has the advantage that the cold coming from the blower 44 Outside air is heated in the tubes 41 and thus the Flame cannot cool down, causing insufficient combustion due to the flame cooling down and thus lowering it heat evaporation of the heating oil is avoided.
  • the diameter the nozzle channels 9 and 16 is at least 0.4 mm can practically never clog, if only because of the Blown nozzle 1 (11) before and after the combustion process becomes.
  • their cross sections are approx. 7 times larger than those of the mechanical ones Atomizer nozzles, the hourly rate be kept at 0.5kg and, as described, with only an increase in air pressure in the pressure vessel 19 can be continuously increased to 1.1kg.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spray-Type Burners (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)

Claims (14)

  1. Dispositif de vaporisation de combustibles et d'alimentation en air de combustion, comprenant une unité d'injecteur (C) alimentée d'une part, par une pompe d'alimentation (30) en carburant, via une conduite d'alimentation en carburant (29) et, d'autre part, par un générateur d'air (21) via une conduite d'air, où l'unité d'injecteur (C) comprend une portion longitudinale et une chambre perpendiculaire à cette portion, dans laquelle sont amenés le combustible et l'air arrivant par les canaux d'alimentation pour s'y mélanger, et où les canaux d'alimentation (6, 14) en combustible débouchent tangentiellement dans la chambre et, de ce fait, mettent le combustible en rotation dans la chambre suivant un mouvement sensiblement perpendiculaire à l'axe longitudinal, et où le mélange est expulsé de l'unité d'injecteur par un canal d'injecteur (9, 16), caractérisé en ce que des canaux d'alimentation en air séparés (4, 18) de l'unité d'injecteur (C) sont constitués par des alésages parallèles disposés suivant la direction axiale, de sorte que l'air est projeté sous pression dans une direction sensiblement perpendiculaire au plan de rotation du combustible tournant dans une première portion (3, 15) de chambre, en ce que la chambre comporte une seconde portion (7, 17) de chambre, disposée axialement à côté de la première portion (3, 15) de chambre et dans laquelle l'air et le mélange peuvent se détendre, et en ce que, directement en amont du canal d'injecteur (6, 16), la chambre comporte une portion de chambre de compression (8, 15) avec un diamètre plus petit que la seconde portion (7, 17) de chambre, dans laquelle le mélange est fortement comprimé avant son expulsion par le canal d'injecteur (9, 16) pour se détendre à la sortie du canal d'injecteur (9, 16), d'une manière explosive, en faisant éclater le combustible en très fines gouttelettes.
  2. Dispositif selon la revendication 1, caractérise en ce que les canaux d'alimentation (6, 14) pour le combustible, dans l'unité d'injecteur, se rétrécissent en largeur, en allant radialement de l'extérieur vers l'intérieur.
  3. Dispositif selon la revendication 1, caractérisé en ce que l'unité d'injecteur (C) est constituée d'une coque d'injecteur (1, 11) et d'un corps d'injecteur (2, 12), la portion de chambre de compression (8, 15) et le canal d'injecteur (9, 16) se trouvant dans la coque d'injecteur (1, 11), et lesdits alésages (4, 18) dans le corps d'injecteur (2, 12).
  4. Dispositif selon la revendication 3, caractérisé en ce que la première portion de chambre est constituée par la portion de chambre de compression (15), en ce que les canaux d'alimentation (14) pour le combustible se trouvent dans la coque d'injecteur (11) et en ce que la seconde portion (17) de chambre se trouve dans la coque d'injecteur (12).
  5. Dispositif selon la revendication 3, caractérisé en ce que les canaux d'alimentation (14) pour le combustible et la première portion (3) de chambre se trouvent dans le corps d'injecteur (2) et en ce que la seconde portion (7) de chambre se trouve dans la coque d'injecteur (1).
  6. Dispositif selon la revendication 1, caractérisé en ce que la profondeur axiale de la seconde chambre (3, 17) et/ou le diamètre des alésages (4, 18) peut ou peuvent être modifiés en fonction de la viscosité du combustible.
  7. Dispositif selon la revendication 1, caractérisé en ce que le combustible et l'air sont soumis à la même pression dans l'unité d'injecteur (C).
  8. Dispositif selon la revendication 1, caractérisé en ce que, à l'intérieur d'un réservoir sous pression (19), dans lequel le combustible est pompé à l'aide d'une pompe d'alimentation (30) en combustible, un compresseur (21) produit une pression d'air, dont le niveau est ajustable par un régulateur (25), en ce que dans le réservoir sous pression (19), il est prévu des moyens (23, 24) qui empêchent un remplissage excessif du réservoir sous pression (19) par le combustible, en ce que le combustible et l'air sous pression sont amenés par une électrovanne (32, 34) hors du réservoir sous pression (19) vers l'unité d'injecteur (C) disposée dans un bloc distributeur (31), en ce que cet air de compression représente une partie de l'air de combustion et en ce que des moyens sont prévus pour projeter de l'air de combustion supplémentaire depuis un ventilateur (40, 44), dans la flamme.
  9. Dispositif selon la revendication 8, caractérisé en ce qu'un cylindre creux (36) connecté avec l'unité d'injecteur comporte des trous latéraux (38), dont la section transversale peut être modifiée par un curseur (39) pour ajuster la quantité d'air de combustion supplémentaire.
  10. Dispositif selon la revendication 8, caractérisé en ce que l'air de combustion supplémentaire est amené perpendiculairement à la flamme, par des tubes (41) dont les extrémités libres (42) sont fermées et qui présentent des trous (43).
  11. Dispositif selon la revendication 10, caractérisé en ce qu'il comporte des moyens (52, 54) par lesquels le ventilateur (44) aspire les gaz d'échappement et mélange ceux-ci avec l'air externe aspiré par les tubes (41), pour les projeter dans la flamme.
  12. Dispositif selon la revendication 8, caractérisé en ce que le ventilateur (44) est un ventilateur axial.
  13. Dispositif selon la revendication 8, caractérisé en ce que le régulateur (25), du réservoir sous pression (19), est à commande électrique.
  14. Dispositif selon la revendication 8, caractérisé en ce que, dans la direction aval, par rapport à l'unité d'injecteur (C), il est prévu un tamis qui peut être chauffé électriquement, sensiblement jusqu'à 750°C.
EP94905823A 1993-02-19 1994-02-17 Dispositif de vaporisation de combustibles et d'alimentation en air de combustion Expired - Lifetime EP0683882B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH514/93 1993-02-19
CH51493 1993-02-19
PCT/IB1994/000015 WO1994019648A1 (fr) 1993-02-19 1994-02-17 Dispositif de vaporisation de combustibles et d'alimentation en air de combustion

Publications (2)

Publication Number Publication Date
EP0683882A1 EP0683882A1 (fr) 1995-11-29
EP0683882B1 true EP0683882B1 (fr) 1998-01-07

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Application Number Title Priority Date Filing Date
EP94905823A Expired - Lifetime EP0683882B1 (fr) 1993-02-19 1994-02-17 Dispositif de vaporisation de combustibles et d'alimentation en air de combustion

Country Status (9)

Country Link
US (1) US5743726A (fr)
EP (1) EP0683882B1 (fr)
JP (1) JPH08506887A (fr)
AT (1) ATE161939T1 (fr)
AU (1) AU5978194A (fr)
CA (1) CA2156248A1 (fr)
DE (1) DE59404953D1 (fr)
HU (1) HUT74194A (fr)
WO (1) WO1994019648A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4431700B2 (ja) * 2004-06-08 2010-03-17 独立行政法人産業技術総合研究所 一酸化炭素除去用触媒及び該触媒を用いた一酸化炭素除去方法
CN100460755C (zh) * 2006-12-04 2009-02-11 潍坊中传拉链配件有限公司 一种燃烧器喷油嘴总成
AT504523B1 (de) * 2007-01-04 2008-06-15 Glueck Christoph Ing Verfahren zum verfeuern von flüssigen brennstoffen
US10689951B2 (en) * 2015-06-29 2020-06-23 Halliburton Energy Services, Inc. Well test burner system and methods of use
CN107388247A (zh) * 2015-11-16 2017-11-24 刘操 一种节能环保气化式燃油燃烧器
CN109855090B (zh) * 2019-01-21 2020-08-04 昆明理工大学 一种生物质液体燃料高效雾化燃烧系统和方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR809455A (fr) * 1935-11-23 1937-03-03 D Applic Mecaniques Soc Ind Perfectionnements apportés aux installations de chauffage par les combustibles liquides
FR855474A (fr) * 1938-05-30 1940-05-11 Garner Submicron Atomizers Ltd Perfectionnements aux brûleurs de combustibles liquides ou atomiseurs de liquides
FR903293A (fr) * 1943-04-14 1945-09-28 Bataafsche Petroleum Procédé et dispositif pour assurer la combustion d'un combustible liquide
GB1364750A (en) * 1972-08-01 1974-08-29 Sred Az Nii Prirodnogo Gaza Sr Gas burners
DE2410141C3 (de) * 1974-03-02 1978-10-26 Sieber, Rolf, 7501 Karlsbad Brenner for fluide Brennstoffe
AT353931B (de) * 1978-04-13 1979-12-10 Hilmar Becker Ges M B H & Co K Oelbrenner
SU775518A1 (ru) * 1978-05-31 1980-10-30 Ивановский энергетический институт им. В.И.Ленина Горелочное устройство
CH680157A5 (fr) * 1989-12-01 1992-06-30 Asea Brown Boveri
US5125828A (en) * 1991-03-18 1992-06-30 Browning James A Granite flame finishing internal burner
US5263849A (en) * 1991-12-20 1993-11-23 Hauck Manufacturing Company High velocity burner, system and method

Also Published As

Publication number Publication date
CA2156248A1 (fr) 1994-09-01
DE59404953D1 (de) 1998-02-12
US5743726A (en) 1998-04-28
JPH08506887A (ja) 1996-07-23
EP0683882A1 (fr) 1995-11-29
AU5978194A (en) 1994-09-14
ATE161939T1 (de) 1998-01-15
HUT74194A (en) 1996-11-28
HU9502439D0 (en) 1995-10-30
WO1994019648A1 (fr) 1994-09-01

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