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WO2008006344A2 - Dispositif brûleur - Google Patents

Dispositif brûleur Download PDF

Info

Publication number
WO2008006344A2
WO2008006344A2 PCT/DE2007/001207 DE2007001207W WO2008006344A2 WO 2008006344 A2 WO2008006344 A2 WO 2008006344A2 DE 2007001207 W DE2007001207 W DE 2007001207W WO 2008006344 A2 WO2008006344 A2 WO 2008006344A2
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
flame
flame holder
burner device
diffuser
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.)
Ceased
Application number
PCT/DE2007/001207
Other languages
German (de)
English (en)
Other versions
WO2008006344A3 (fr
Inventor
Dieter Most
Andreas Rutsche
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.)
Webasto SE
Original Assignee
Webasto SE
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 Webasto SE filed Critical Webasto SE
Publication of WO2008006344A2 publication Critical patent/WO2008006344A2/fr
Publication of WO2008006344A3 publication Critical patent/WO2008006344A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F23D11/36—Details
    • F23D11/40—Mixing tubes; Burner heads
    • F23D11/406—Flame stabilising means, e.g. flame holders
    • 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
    • F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
    • 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
    • F23D2900/00016—Preventing or reducing deposit build-up on burner parts, e.g. from carbon
    • 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

Definitions

  • the invention relates to a burner device for the combustion of liquid fuel with a spray nozzle for mixing the liquid fuel with combustion air to form an ignitable gas mixture and with a flame holder for stabilizing a gas mixture burning flame.
  • Such a burner device is known from DE 103 27 697 Al.
  • This document includes a so-called atomizing burner, in which liquid fuel and combustion air are accelerated and swirled in a nozzle, so that the liquid fuel vaporizes as much as possible; This forms an ignitable fuel gas mixture.
  • the gas mixture is fed into a combustion chamber where it is ignited and burned.
  • the quality of the incineration that is, its completeness and depletion in the first place, is highly dependent on the completeness of the evaporation of the liquid fuel and its good mixing with the combustion air.
  • an additional flame holder for stabilizing the flame is arranged downstream of the atomizing nozzle in the actual combustion chamber.
  • the flame holder is designed as a wire mesh or ceramic perforated plate or ceramic fiber mat and has the task to determine the combustion and stabilize.
  • the combustion takes place under controlled and low-emission conditions inside and / or on the surface of the flame holder.
  • a disadvantage of the known device is its susceptibility to coking of the nozzle. This is the result of successive deposition of incompletely combusted fuel at the nozzle wall. This impedes optimal decomposition. Dusting and further deteriorates the combustion, so that the coke buildup accelerates in the nozzle.
  • a worse atomization can lead to a combustion with a high tendency to soot and concomitant increased aging of the other components of the burner, in particular the heat exchanger or the combustion chamber, and thus to a reduction of the heat output up to the failure of the burner.
  • a reduced atomization can lead to a smoke and odor emission, in particular at the burner start, as well as to flame breaks during burner operation.
  • the burner device according to the invention builds on the generic state of the art in that the flame holder is arranged in the region of the nozzle outlet. It is thus shifted back upstream of the known burner devices from the flame chamber in the region of the nozzle. As a result, the above-explained flame stabilization takes place directly at the nozzle outlet. The position of the flame root is now located directly in the area of the nozzle exit instead of away from the nozzle in the area of the combustion chamber. Due to the greater proximity of the flame root to the nozzle, an increase in the nozzle temperature takes place during burner operation. The temperature of the nozzle wall is thus increased beyond the so-called coking limit, so that there precipitating fuel can not lead to coke formation on the nozzle wall.
  • the nozzle is constructed in the form of a Venturi nozzle or has at least in its end a diverging diffuser.
  • the flame holder At this diffuser is fixed in a preferred embodiment of the invention, the flame holder. It is particularly advantageous if the flame holder is formed integrally with the diffuser.
  • the flame holder it is also possible to manufacture the flame holder as a separate part and set on the diffuser edge or in the diffuser on the inner wall.
  • the definition can be permanent or reversible. The latter allows easy replacement of the diffuser.
  • the flame holder is formed star-shaped.
  • the design has proven to be particularly favorable as a star with three stars.
  • a star-shaped flame holder with comparatively large open areas does not oppose the gas flow too great a resistance, as may be the case when using a pore disk or a fleece at the same location. Nevertheless, the mixing is improved by improved turbulence formation in the nozzle.
  • behind the flame holder there is a division into a plurality of uniform partial flow zones, which leads directly to a homogenization and stabilization of the flame. This results in a more efficient combustion and a reduction of combustion noise.
  • the surface of the flame holder on a porous material Preferably, the surface of the flame holder on a porous material.
  • the porous material of the flame holder can absorb spongy vaporized fuel and gradually release it in vaporized form to the gas stream. In this way, an entry of liquid droplets in the combustion chamber is prevented or at least significantly reduced even when starting the burner in the cold state.
  • the flame holder can be coated with a porous material be.
  • metal foams are also considered, for example.
  • FIG. 1 shows a schematic representation of an embodiment of the burner device according to the invention in FIG.
  • Figure 2 is a schematic representation of an embodiment of the burner device according to the invention in plan view.
  • FIG. 1 shows a schematic representation of a burner device according to the invention in the region of the combustion chamber 10 in a cross-sectional view.
  • a Venturi nozzle 12 On the input side of the combustion chamber 10, a Venturi nozzle 12 is provided, is accelerated by the liquid fuel with combustion air and swirled to feed an ignitable gas mixture into the combustion chamber 10.
  • the exit region of the venturi nozzle 12 is configured as a diffuser 14 diverging in the flow direction.
  • a flame holder 16 is arranged in the end region of the diffuser 14.
  • the flame holder 16 is substantially perpendicular to the flow direction.
  • Figure 2 shows a view of the flame holder 16 according to the section line II-II in Figure 1.
  • the flame holder is designed as a three-bladed star, leaving a large open area 18 in the flame retainer plane unadjusted. As a result, the gas flow is only slightly affected.
  • a flame root can form in the immediate vicinity of the nozzle 12, so that the nozzle temperature is raised above the coking limit.
  • the flame retainer is formed of a porous material, in particular a porous ceramic.
  • an additional function of the flame holder is realized as a drip catcher.
  • This function can be further supported by the fact that, as realized in the illustrated embodiment, the inner wall of the diffuser 14 is covered with a porous material.
  • the diffuser and the flame holder can be formed in one piece from the same porous material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spray-Type Burners (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

Dispositif brûleur destiné à brûler du combustible liquide, qui comporte une buse d'atomisation servant à mélanger le combustible liquide avec de l'air de combustion pour former un mélange gazeux inflammable, et un porte-flamme destiné à stabiliser la flamme brûlant le mélange gazeux. Selon la présente invention, pour empêcher l'encrassement de la buse, le porte-flamme est placé dans la zone de l'orifice de sortie de la buse. Grâce à cette configuration, la racine de la flamme est déplacée vers l'arrière en direction de la buse, ce qui augmente la température de ladite buse au-dessus de la limite d'encrassement.
PCT/DE2007/001207 2006-07-10 2007-07-09 Dispositif brûleur Ceased WO2008006344A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610031868 DE102006031868B4 (de) 2006-07-10 2006-07-10 Brennervorrichtung
DE102006031868.4 2006-07-10

Publications (2)

Publication Number Publication Date
WO2008006344A2 true WO2008006344A2 (fr) 2008-01-17
WO2008006344A3 WO2008006344A3 (fr) 2008-04-17

Family

ID=38825142

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2007/001207 Ceased WO2008006344A2 (fr) 2006-07-10 2007-07-09 Dispositif brûleur

Country Status (2)

Country Link
DE (1) DE102006031868B4 (fr)
WO (1) WO2008006344A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011006370B4 (de) * 2011-03-29 2013-07-04 Webasto Ag Brenner und Verfahren zum Verbrennen eines flüssigen Brennstoffs

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1255497A (fr) * 1960-01-29 1961-03-10 Sicma Soc Pour L Installation Tête de combustion pour brûleurs à combustibles liquides ou gazeux
GB956288A (en) * 1960-02-01 1964-04-22 Gulf Oil Great Britain Ltd Burner apparatus
DE2839948A1 (de) * 1978-09-14 1980-03-27 Thyssen Industrie Verfahren zum herstellen eines flammhalters fuer brenner, insbesondere mit geringer leistung
DE8604089U1 (de) * 1986-02-15 1986-04-03 Klöckner & Co KGaA Zweigniederlassung Hechingen, 7450 Hechingen Mischeinrichtung für einen Gas- und Ölbrenner
DE8609585U1 (de) * 1986-04-09 1986-05-28 Colsmann & Co, 5980 Werdohl Vorrichtung zur Erzeugung eines brennbaren Gemisches aus Butan- oder Propangas und Luft
US5073105A (en) * 1991-05-01 1991-12-17 Callidus Technologies Inc. Low NOx burner assemblies
DE19509854C2 (de) * 1994-09-28 2001-01-04 Abig Werke Carry Gross Gmbh Heizvorrichtung zum Verbrennen von zugeführtem Brennstoff
US20060003275A1 (en) * 2002-03-12 2006-01-05 Roland Oehm Burner, particularly for liquid or gaseous fuels
CH696152A5 (de) * 2003-06-04 2007-01-15 Toby Ag Vormischender Brenner mit einem zylindrischen Flammenhalter.

Also Published As

Publication number Publication date
WO2008006344A3 (fr) 2008-04-17
DE102006031868B4 (de) 2009-07-30
DE102006031868A1 (de) 2008-01-17

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