EP1812747A1 - Bruleur pour un appareil de chauffage, presentant une alimentation en combustible amelioree - Google Patents

Bruleur pour un appareil de chauffage, presentant une alimentation en combustible amelioree

Info

Publication number
EP1812747A1
EP1812747A1 EP05814457A EP05814457A EP1812747A1 EP 1812747 A1 EP1812747 A1 EP 1812747A1 EP 05814457 A EP05814457 A EP 05814457A EP 05814457 A EP05814457 A EP 05814457A EP 1812747 A1 EP1812747 A1 EP 1812747A1
Authority
EP
European Patent Office
Prior art keywords
burner
fuel
heat shield
burner according
baffle plate
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.)
Withdrawn
Application number
EP05814457A
Other languages
German (de)
English (en)
Inventor
Michael PÖHNER
Friedrich Widemann
Steffen Weber
Jan Steffens
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 EP1812747A1 publication Critical patent/EP1812747A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D9/00—Burners in which a stream of liquid fuel impinges intermittently on a hot surface
    • 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
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/40—Mixing tubes or chambers; Burner heads
    • 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, e.g. burner cooling means, noise reduction means
    • F23D11/40—Mixing tubes or chambers; 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
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F23D11/40—Mixing tubes or chambers; Burner heads
    • F23D11/408—Flow influencing devices in the air tube
    • 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
    • F23D2900/11401—Flame intercepting baffles forming part of burner head

Definitions

  • the invention relates to a burner for a heater, in particular for use in motor vehicles, having a burner nozzle for supplying and atomizing fuel, which has a fuel needle for supplying fuel into the burner and a combustion air supply for supplying combustion air into the burner, and a start zone in which an ignition of the fuel to start the burner er ⁇ follows.
  • Such burners which are also referred to as atomizing burners or as spray burners, are used in particular in auxiliary heaters and auxiliary heaters for motor vehicles.
  • auxiliary heaters and auxiliary heaters for motor vehicles.
  • the object of the invention is to at least partially overcome the described problems of the prior art and, in particular, to enable a reliable and low-emissivity or low-smoke starting behavior with different installation positions.
  • the invention is based on the burner of the generic type in that, by choosing the inner diameter of the fuel needle, the exit velocity of the fuel is predetermined in such a way that fuel reaches the starting zone in a substantially unatomized form during a starting phase of the burner.
  • the exit speed of the fuel is increased in Glei ⁇ chem fuel delivery volume.
  • the inner diameter of the fuel needle is between 0.5 and 0.7 mm.
  • the exit velocity at inner diameters between 0.5 and 0.7 mm can be almost doubled or even more than doubled ,
  • the inner diameter of the fuel needle is about 0.6 mm.
  • exit speeds of more than 0.6 m / s are possible in full-load operation, ie at a fuel mass flow of 0.5 kg / h, while at an inner diameter of 0.8 mm, the exit velocity is in the range of 0.35 m / s.
  • the exit speed increases during part-load operation, that is to say at a fuel mass flow of 0.2 kg / h from approximately 0.14 m / s to approximately 0.25 m / s.
  • the goal of a substantially non-atomized jet which reaches the starting zone when starting the heater, can also be achieved with a conventional fuel needle with an inner diameter of approximately 0.8 mm.
  • the starting zone is designed as a starting chamber into which an ignition element protrudes.
  • the wall of the combustion chamber can surround the ignition element in this way.
  • the "ballistic" fuel jet then the ignition element and wet the combustion chamber wall with fuel, so that the combustion chamber wall and adjacent components serve as wall evaporator after their heating.
  • secondary air can be fed into the combustion chamber through openings provided in the heat shield and through a heat shield arranged between the burner nozzle and a combustion chamber the openings are equipped with air guide elements.
  • a heat shield is fundamentally useful for shielding the nozzle and the fuel feed against the heat energy present in the combustion chamber.
  • Secondary air is fed into the combustion chamber via the heat shield.
  • the air guiding elements are formed by tabs formed in the direction of the combustion chamber and integrally formed with the heat shield.
  • a heat shield can be manufactured in a simple manner, for example by forming holes with a V-shaped punching tool, which are bent out of the plane of the heat shield after or with the punching operation.
  • the invention is also usefully further developed in that the tabs are arranged at different angles to the surface of the heat shield and / or to the radius of the heat shield. Shield are formed. If the tabs extend almost perpendicular to the radius of the heat shield, a strong twist is introduced by the latter, while a lesser twist is introduced by tabs with a smaller angle to the radius. Tabs, which occupy a small angle to the surface of the heat shield, produce Heilströ ⁇ regulations, which have a large radial component and a small axial component, while in tabs with large angles to the surface of the heat shield, the axial component dominated. In this way it is possible to direct secondary air with little swirl into the core region of the flame formation.
  • the air required for combustion is supplied; however, there is no excessive swirl which would adversely affect the stabilization of the flame.
  • a division of the secondary air can take place as a function of the orientation of the individual air guiding elements.
  • the tabs are formed in groups at substantially identical angles to the surface of the heat shield and / or to the radius of the heat shield. The collective alignment of the straps results in defined flow states in the combustion chamber.
  • the invention is further useful in that the burner has a burnout zone and that the secondary air supplied to the burnout zone has a higher swirl than the secondary air supplied to the start zone.
  • the burner has a burnout zone and that the secondary air supplied to the burnout zone has a higher swirl than the secondary air supplied to the start zone.
  • a high twist is desired.
  • a radially inward swirled back Stream area improves burnout and ensures that the combustion chamber volume is well utilized.
  • the heat shield has an opening for the passage of an ignition element.
  • the Brenn ⁇ chamber is substantially axially symmetrical, that in the combustion chamber, a baffle plate is arranged and that the baffle plate has a predetermined curvature in the axial direction. Due to the curvature of the baffle plate, there is a temperature-independent defined shaping of the baffle plate. In the case of newly formed baffle plates of the prior art, this is sometimes not the case since, depending on the temperature, spontaneous changes in shape can occur, which can adversely affect the combustion behavior of the burner.
  • the curvature is provided in the direction of the burnout zone. As a result, a sufficient space is provided in the region of the starting chamber. Furthermore, it has been found that the curvature in the direction of the burn-out zone does not adversely affect the flow behavior in this zone. In particular, the turbulent pronounced backflow region is retained in the radially inner region of the burnout zone.
  • the outer circumference of the baffle plate defines a level and that the ratio between the maximum axial distance of the baffle plate from this plane and the diameter of the baffle plate is between 0.07 and 0.21.
  • the most bulged point of the baffle plate is preferably substantially at the center of the assembly with respect to the radial coordinate. From the plane defined by the outer circumference of the baffle plate, this point has an axial distance defined by the specified ratio to the diameter.
  • the ratio between the maximum axial distance of the baffle plate from the plane and the diameter of the baffle disc is about 0.14.
  • the round diameter of the baffle plate is about 40 mm, while the bulge has a value of about 5.7 mm.
  • the invention is based on the finding that the operating behavior of a burner can be markedly improved by the novel fuel feed with a fuel needle having a reduced outlet cross section, in particular in combination with the novel heat shield and the novel baffle plate. This applies in particular to the starting behavior, the stability of the burner operation and the possibilities with regard to the installation position of the burner in the motor vehicle.
  • FIG. 1 shows a sectional view of a burner according to the invention
  • FIG. 2 is a perspective view of a burner flange with a heat shield inserted therein;
  • FIG 3 shows a perspective view of a heat shield.
  • FIG. 1 shows a sectional view of a burner according to the invention.
  • the burner 10 according to the invention has a nozzle 12 which is fixedly connected to a heat shield 24.
  • the heat shield 24, together with a burner tube 40 connected to the heat shield 24, defines a combustion chamber 22.
  • the combustion chamber tube 40 is surrounded by an outer tube 42, which forms the burner flange. At this outer tube 42, a flame tube 38 is attached.
  • the connections between heat shield 24 and combustion chamber tube 40 or between combustion chamber tube 40, outer tube 42 and flame tube 38 are generally welded joints.
  • a fuel feed 50 which has a metal tube 52 for supplying fuel and a fuel needle 14 for injecting fuel into the combustion chamber 22, is arranged on the fuel nozzle 12.
  • a baffle plate 36 is further arranged, which has an advantageous curvature. This curvature in the direction of the burn-out zone 32 is advantageous because heat-induced spontaneous changes in form of the baffle plate 36 are thereby prevented. Due to the curvature of the baffle plate 36 in the direction of the Ausbrandzone 32 is also a sufficient space for the accommodation of the start chamber 18 is available. The wall defining the start chamber 18 is welded to the baffle plate 36.
  • FIG. 2 shows a perspective view of a burner flange with a heat shield inserted therein
  • FIG. 3 shows a perspective view of a heat shield.
  • the heat shield 24 has a central opening 48 through which the fuel-air mixture discharged from the nozzle 12 enters the combustion chamber. Furthermore, a laterally arranged opening 34 for the passage of the ignition element 20 is provided. On the heat shield 24 fastening pins 44, 46 are further provided, on which the nozzle 12 is attached.
  • the heat shield 24 also has a plurality of openings 26 through which secondary air can enter the combustion chamber 22. On the combustion chamber 22 facing side of the Hit ⁇ zeschildes 24 triangular air guide elements 28, 30 are provided.
  • a first group of air guiding elements whose members are partially designated by the reference numeral 28, are at a large angle to the radius of the heat Shield 24 aligned, that is, their orientation is substantially or nearly tangential.
  • the secondary air which passes through the corresponding openings 26 and whose outlet flow direction is indicated by an arrow, passes with high swirl past the baffle plate 36 into the burn-out zone 32.
  • This air which is provided with a high swirl, flows radially outer region of the burn-out zone 32 in the rear region of the combustion chamber 22, that is, in the region of the combustion chamber 22 facing away from the heat shield 24, and then with great turbulence in the central region back towards the baffle plate 36. Consequently, there is an advantageous Mixing of the gaseous components in the burn-out zone 32.
  • Another group of air-guiding elements 30 has a smaller angle to the radius of the heat shield 24 in their orientation. These air guide elements are partially identified by the reference numeral 30. In addition, these air guiding elements 30 have a smaller angle to the surface of the heat shield 24 than the air guiding elements 28. Consequently, secondary air whose outlet flow direction is indicated by a further arrow is guided by these air guiding elements 30 into the core region of the flame with a small twist , which in particular favors a sta ⁇ biles burning behavior.

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)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)

Abstract

L'invention concerne un brûleur destiné à un appareil de chauffage, utilisé en particulier dans des véhicules automobiles, comprenant: une buse (12) qui sert à acheminer et à pulvériser du combustible et présente une aiguille à combustible (14) servant à acheminer du combustible dans le brûleur (10) et un dispositif d'alimentation en air de combustion (16) servant à acheminer de l'air de combustion dans le brûleur; et une zone de démarrage (18) dans laquelle se produit l'allumage du combustible pour le démarrage du brûleur. Selon l'invention, la vitesse de sortie du combustible est prédéterminée par le choix du diamètre intérieur de l'aiguille à combustible (14) de sorte que, pendant une phase de démarrage du brûleur (10), le combustible sous forme sensiblement non pulvérisée atteint la zone de démarrage (18).
EP05814457A 2004-11-17 2005-11-16 Bruleur pour un appareil de chauffage, presentant une alimentation en combustible amelioree Withdrawn EP1812747A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004055437 2004-11-17
PCT/DE2005/002060 WO2006053541A1 (fr) 2004-11-17 2005-11-16 Bruleur pour un appareil de chauffage, presentant une alimentation en combustible amelioree

Publications (1)

Publication Number Publication Date
EP1812747A1 true EP1812747A1 (fr) 2007-08-01

Family

ID=35985443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05814457A Withdrawn EP1812747A1 (fr) 2004-11-17 2005-11-16 Bruleur pour un appareil de chauffage, presentant une alimentation en combustible amelioree

Country Status (9)

Country Link
US (1) US20090239184A1 (fr)
EP (1) EP1812747A1 (fr)
JP (1) JP2008520949A (fr)
KR (1) KR20070086043A (fr)
CN (1) CN101103226A (fr)
CA (1) CA2601319A1 (fr)
DE (1) DE112005003410A5 (fr)
RU (1) RU2361107C2 (fr)
WO (1) WO2006053541A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011087971B4 (de) * 2011-12-08 2021-03-04 Eberspächer Climate Control Systems GmbH Verfahren zum Betreiben eines mit Kohlenwasserstoff-Brennstoff betreibbaren Heizgeräts

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2571336A (en) * 1946-10-02 1951-10-16 Salem Engineering Company Gaseous fuel burner for furnace walls
US3081948A (en) * 1960-12-01 1963-03-19 Exxon Research Engineering Co Oil burner system
SE329230B (fr) * 1968-04-18 1970-10-05 Bahco Ab
DE1935397A1 (de) * 1969-07-11 1971-01-14 Schneider Rohrleitung Paul Verfahren zum Betrieb eines mit OEl als Brennstoff gespeisten Brenners,insbesondere fuer Kalkschachtoefen,sowie Brenner zur Durchfuehrung des Verfahrens
US4561841A (en) * 1980-11-21 1985-12-31 Donald Korenyi Combustion apparatus
DD159018A3 (de) * 1981-04-10 1983-02-16 Werner Penske Brenner fuer fluessige brennstoffe
GB2106632B (en) * 1981-09-11 1985-06-12 Secr Defence Fuel and gas mixing
US4561229A (en) * 1982-09-30 1985-12-31 Pleion Corporation Modular screen assembly
SE454460B (sv) * 1983-06-14 1988-05-02 Sandstroem Christer Brennare for olja, gas, kolpulversuspension m fl brenslen
GB2143938B (en) * 1983-07-23 1986-08-13 Rolls Royce Fuel burner for a gas turbine engine
DE3732656A1 (de) * 1987-09-28 1989-04-13 Edt Technik Consult Und Umwelt Kessel mit brenner fuer fluessige oder gasfoermige fossile brennstoffe
JPH02150607A (ja) * 1988-11-29 1990-06-08 Ebara Corp ガンタイプバーナの旋回型保炎板
DE4301779C2 (de) * 1993-01-23 1997-07-17 Elco Energiesysteme Ag Brenner zur Verbrennung eines flüssigen oder gasförmigen Brennstoffes
DE4323300C2 (de) * 1993-07-12 1998-03-19 Oertli Waermetechnik Ag Mischvorrichtung für einen Brenner
DE10019198A1 (de) * 2000-04-17 2001-10-18 Webasto Thermosysteme Gmbh Zerstäuberbrenner
DE10019890C2 (de) * 2000-04-20 2003-05-22 Webasto Thermosysteme Gmbh Brenner mit Flammrohr
DE10039152A1 (de) * 2000-08-06 2002-02-14 Webasto Thermosysteme Gmbh Zerstäuberbrenner
DE10156980B4 (de) * 2001-11-21 2004-08-05 Lurgi Ag Verfahren zur Herstellung von Synthesegas
DE10347509B4 (de) * 2003-10-13 2006-08-10 Webasto Ag Heizgerät mit einer Zerstäuberdüse
US20090220901A1 (en) * 2004-11-17 2009-09-03 Webasto Ag Burner for a heater with improved fuel supply, improved heat shield and improved baffle plate
WO2006053537A1 (fr) * 2004-11-17 2006-05-26 Webasto Ag Bruleur pour un appareil de chauffage presentant un ecran thermique ameliore
CN101103228A (zh) * 2004-11-17 2008-01-09 韦巴斯托股份公司 具有改进的挡板的用于加热器的燃烧器

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006053541A1 *

Also Published As

Publication number Publication date
US20090239184A1 (en) 2009-09-24
RU2361107C2 (ru) 2009-07-10
JP2008520949A (ja) 2008-06-19
KR20070086043A (ko) 2007-08-27
RU2007122480A (ru) 2008-12-27
WO2006053541A1 (fr) 2006-05-26
CA2601319A1 (fr) 2006-05-26
DE112005003410A5 (de) 2007-10-25
CN101103226A (zh) 2008-01-09

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