US20090239184A1 - Burner for a heater device with improved fuel supply - Google Patents

Burner for a heater device with improved fuel supply Download PDF

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Publication number
US20090239184A1
US20090239184A1 US11/719,573 US71957305A US2009239184A1 US 20090239184 A1 US20090239184 A1 US 20090239184A1 US 71957305 A US71957305 A US 71957305A US 2009239184 A1 US2009239184 A1 US 2009239184A1
Authority
US
United States
Prior art keywords
burner
baffle plate
fuel
combustion chamber
heat shield
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.)
Abandoned
Application number
US11/719,573
Other languages
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
Individual
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 Individual filed Critical Individual
Publication of US20090239184A1 publication Critical patent/US20090239184A1/en
Assigned to Webasto SE reassignment Webasto SE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEBER, STEFFEN, WIDEMANN, FRIEDRICH, POHNER, MICHAEL, STEFFENS, JAN
Abandoned legal-status Critical Current

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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, especially for use in motor vehicles, with a burner nozzle for supply and atomization of fuel, which has a fuel needle for supplying fuel to the burner and a combustion air supply for supplying combustion air to the burner, and a starting zone in which ignition of the fuel to start the burner takes place.
  • Burners of the initially mentioned type which are also called atomization burners or spray burners, are used especially in auxiliary heaters and engine independent heaters for motor vehicles.
  • the object of the invention is to overcome the described problems of the prior art at least in part and especially to enable reliable and low-emission starting behavior with little dense smoke in different installation positions.
  • exit speed of the fuel being predetermined by choosing the inside diameter of the fuel needle such that, during the starting phase of the burner, fuel in essentially unatomized form reaches the starting zone.
  • the inside diameter of the fuel needle be between 0.5 mm and 0.7 mm. Compared to exit speeds for fuel needles of the prior art in which the inside diameter is in the region of 0.8 mm, the exit speed for inside diameters between 0.5 mm and 0.7 mm can be almost doubled or even more than doubled.
  • the inside diameter of the fuel needle is roughly 0.6 mm.
  • exit speeds of more than 0.6 m/s are possible, while for an inside diameter of 0.8 mm, the exit speed is in the region of 0.35 m/s.
  • the exit speed in partial load operation rises accordingly, i.e., for a fuel mass flow of 0.2 kg/h, from roughly 0.14 m/s to roughly 0.25 nm/s.
  • the goal of an essentially unatomized jet which reaches the starting zone when the heater is being started can be achieved even with an otherwise conventional fuel needle with an inside diameter of roughly 0.8 mm.
  • the starting zone is made as a starting chamber into which an ignition element projects.
  • the wall of the combustion chamber can surround the ignition element in this way.
  • the “ballistic” fuel jet can then wet the ignition element and the combustion chamber wall with fuel so that the combustion chamber wall and adjacent components, after being heated, are used as wall vaporizers.
  • secondary air can be supplied to the combustion chamber through openings provided in the heat shield, and that the openings are provided with air guide elements.
  • a heat shield is fundamentally useful to shield the nozzle and the fuel supply against the heat energy present in the combustion chamber.
  • secondary air is supplied to the combustion space via the heat shield.
  • the air guide elements prefferably be formed by tabs which are made integrally with the heat shield and which project in the direction of the combustion chamber.
  • This heat shield can be easily produced, for example, by the tabs being formed with a v-shaped punching tool and being bent out of the plane of the heat shield after or with the punching process.
  • the invention is also usefully developed in that the tabs are made at different angles to the surface of the heat shield and/or to the radius of the heat shield. If the tabs extend almost perpendicularly to the radius of the heat shield, this delivers strong angular momentum, while tabs with a smaller angle relative to the radius deliver smaller angular momentum. Tabs which assume a small angle to the surface of the heat shield produce air flows which have a large radial component and a small axial component, while for tabs with large angles relative to the surface of the heat shield, the axial component dominates. In this way, it is possible to route secondary air with low angular momentum into the core region of flame formation. Thus, on the one hand, the air required for combustion is supplied; but there is no excess angular momentum which would adversely affect stabilization of the flame. In particular, the secondary air can be divided depending on the alignment of the individual air guide elements.
  • the tabs are grouped at essentially identical angles relative to the surface of the heat shield and/or to the radius of the heat shield. Defined flow states in the combustion chamber are formed by the collective alignment of the tabs.
  • the invention is also usefully executed such that the burner has a burnout zone and that the secondary air which is supplied to the burnout zone has higher angular momentum than the secondary air which is supplied to the starting zone.
  • High angular momentum is desired in the burnout zone.
  • a radially inside swirled backflow region improves the burnout and provides for the combustion chamber volume being effectively used.
  • the heat shield has an opening for routing the ignition element through.
  • the combustion chamber is essentially axially symmetrical, that there is a baffle plate in the combustion chamber, and that the baffle plate has a given curvature in the axial direction. Due to the curvature of the baffle plate, there is a defined shaping of the baffle plate which is independent of temperature. For the baffle plates of the prior art which are made flat, this is, among others, not the case since, depending on the temperature, spontaneous changes of shape can occur which can adversely affect the combustion behavior of the burner.
  • the outer periphery of the baffle plate defines a plane 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 heavily arched point of the baffle plate is preferably essentially in the center of the arrangement with respect to the radial coordinate. From the plane which is defined by the outer periphery of the baffle plate, this point has an axial distance which is defined by the indicated ratio to the diameter.
  • the ratio between the maximum axial distance of the baffle plate from the plane and the diameter of the baffle plate is roughly 0.14.
  • the round diameter of baffle plate is roughly 40 mm, while the curvature has a value of roughly 5.7 mm.
  • the invention is based on the finding that the novel fuel supply with a fuel needle with a reduced exit cross section, especially in combination with the novel heat shield and the novel baffle plate, can greatly improve the operating behavior of a burner. This relates especially to the starting behavior, the stability of burner operation and possibilities with respect to the installation position of the burner in the motor vehicle.
  • FIG. 1 is a sectional view of the burner in accordance with the invention.
  • FIG. 2 is a perspective of a burner flange with the heat shield inserted into it.
  • FIG. 3 is a perspective of the heat shield.
  • FIG. 1 shows a sectional view of the burner in accordance with the invention.
  • the burner 10 in accordance with the invention has a nozzle 12 which is securely joined to the heat shield 24 .
  • the heat shield 24 together with a burner tube 40 which is connected to the heat shield 24 defines a combustion chamber 22 .
  • the combustion chamber tube 40 is surrounded by an outer pipe 42 which forms the burner flange.
  • a flame tube 38 is attached to this outer pipe 42 .
  • the connections between the heat shield 24 and the combustion chamber tube 40 or between the combustion chamber tube 40 , the outer pipe 42 and the flame tube 38 are generally welded connections.
  • On the fuel nozzle 12 there is a fuel supply 50 which has a metal pipe 52 for supplying of fuel and a fuel needle 14 for injection of fuel into the combustion chamber 22 .
  • the fuel nozzle 16 there are channels for supplying of primary combustion air into the fuel nozzle 20 which flows past the fuel needle 14 in order to then flow along the radially widening air guide of the fuel nozzle 12 in the direction of the combustion chamber, and finally, into the combustion chamber 22 .
  • the radial widening of the air guide achieves improved atomization due to the Venturi effect.
  • Within the combustion chamber 22 there is also a baffle plate 36 which has an advantageous curvature. This curvature in the direction of the burnout zone 32 is advantageous since, in this way, heat-induced spontaneous changes in the shape of the baffle plate 36 are prevented. By curving the baffle plate 36 in the direction of the burnout zone 32 , moreover, a sufficient space is available for accommodating the starting chamber 18 .
  • the wall which defines the starting chamber 18 is welded to the baffle plate 36 .
  • FIG. 2 shows a perspective view of a burner flange with the heat shield inserted into it
  • FIG. 3 shows a perspective view of heat shield 24
  • the heat shield 24 has a central opening 48 through which the fuel-air mixture which has been delivered from the nozzle 12 enters the combustion chamber. Furthermore, there is a laterally arranged opening 34 through which the ignition element 20 is routed. On the heat shield 24 , there are attachment pins 44 , 46 to which the nozzle 12 is attached.
  • the heat shield 24 also has a host of openings 26 through which secondary air can enter the combustion chamber 22 .
  • On the side of the heat shield 24 facing the combustion chamber 22 there are triangular air guide elements 28 , 30 .
  • the air guide elements 28 , 30 cause division of the secondary air based on the different angles relative to the radius of the heat shield 24 .
  • a first group of air guide elements 28 are aligned at a large angle with respect to the radius of the heat shield 24 , i.e., their alignment is essentially or almost tangential. Based on this alignment, the secondary air passing through the corresponding openings 26 , with an exit flow direction indicated by the arrow, will overflow into the burnout zone 32 past the baffle plate 36 with a high angular momentum.
  • This air which is provided with high angular momentum flows in the radially outlying region of the burnout zone 32 into the posterior region of the combustion chamber 22 , i.e., into the region of the combustion chamber 22 which faces away from the heat shield 24 , and then, with high swirling back in the central region in the direction of the baffle plate 36 . Consequently advantageous mixing of the gaseous components in the burnout zone 32 occurs.
  • Another group of air guide elements 30 are aligned at a smaller angle relative to the radius of the heat shield 24 and also have a smaller angle relative to the surface of the heat shield 24 than the air guide elements 28 . Consequently, these air guide elements 30 route the secondary air with an exit flow direction, indicated by another arrow, into the core region of the flame with low angular momentum; this especially benefits stable combustion chamber 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)
US11/719,573 2004-11-17 2005-11-16 Burner for a heater device with improved fuel supply Abandoned US20090239184A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004055437 2004-11-17
DE102004055437.4 2004-11-17
PCT/DE2005/002060 WO2006053541A1 (de) 2004-11-17 2005-11-16 Brenner für ein heizgerät mit verbesserter brennstoffzuführung

Publications (1)

Publication Number Publication Date
US20090239184A1 true US20090239184A1 (en) 2009-09-24

Family

ID=35985443

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/719,573 Abandoned US20090239184A1 (en) 2004-11-17 2005-11-16 Burner for a heater device with improved fuel supply

Country Status (9)

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

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

Citations (19)

* 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
US3531229A (en) * 1968-04-18 1970-09-29 Bahco Ab Burner
DE3210456A1 (de) * 1981-04-10 1982-11-11 Veb Kombinat Fortschritt Landmaschinen Neustadt In Sachsen, Ddr 8355 Neustadt Brenner fuer fluessige brennstoffe
GB2106632A (en) * 1981-09-11 1983-04-13 Secr Defence Fuel and gas mixing
WO1985000051A1 (en) * 1983-06-14 1985-01-03 Sandstroem Christer Burner for fossil fuels
GB2143938A (en) * 1983-07-23 1985-02-20 Rolls Royce Fuel burner for a gas turbine engine
US4561229A (en) * 1982-09-30 1985-12-31 Pleion Corporation Modular screen assembly
US4561841A (en) * 1980-11-21 1985-12-31 Donald Korenyi Combustion apparatus
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
DE4301779A1 (de) * 1993-01-23 1994-07-28 Elco Energiesysteme Ag Stauscheibe für Öl- und Gasbrenner
DE4323300A1 (de) * 1993-07-12 1995-01-19 Oertli Waermetechnik Ag Mischvorrichtung für einen Brenner
DE10019890A1 (de) * 2000-04-20 2001-10-25 Webasto Thermosysteme Gmbh Brenner mit Flammrohr
US20030095920A1 (en) * 2001-11-21 2003-05-22 Holger Schlichting Process of producing synthesis gas
US20050079458A1 (en) * 2003-10-13 2005-04-14 Webasto Ag Heater with an atomizer nozzle
US20090220903A1 (en) * 2004-11-17 2009-09-03 Webasto Ag Burner for a heater with improved heat shield
US20090220902A1 (en) * 2004-11-17 2009-09-03 Webasto Ag Burner for a heater with improved baffle plate
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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE10019198A1 (de) * 2000-04-17 2001-10-18 Webasto Thermosysteme Gmbh Zerstäuberbrenner
DE10039152A1 (de) * 2000-08-06 2002-02-14 Webasto Thermosysteme Gmbh Zerstäuberbrenner

Patent Citations (19)

* 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
US3531229A (en) * 1968-04-18 1970-09-29 Bahco Ab Burner
US4561841A (en) * 1980-11-21 1985-12-31 Donald Korenyi Combustion apparatus
DE3210456A1 (de) * 1981-04-10 1982-11-11 Veb Kombinat Fortschritt Landmaschinen Neustadt In Sachsen, Ddr 8355 Neustadt Brenner fuer fluessige brennstoffe
GB2106632A (en) * 1981-09-11 1983-04-13 Secr Defence Fuel and gas mixing
US4561229A (en) * 1982-09-30 1985-12-31 Pleion Corporation Modular screen assembly
WO1985000051A1 (en) * 1983-06-14 1985-01-03 Sandstroem Christer Burner for fossil fuels
GB2143938A (en) * 1983-07-23 1985-02-20 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
DE4301779A1 (de) * 1993-01-23 1994-07-28 Elco Energiesysteme Ag Stauscheibe für Öl- und Gasbrenner
DE4323300A1 (de) * 1993-07-12 1995-01-19 Oertli Waermetechnik Ag Mischvorrichtung für einen Brenner
DE10019890A1 (de) * 2000-04-20 2001-10-25 Webasto Thermosysteme Gmbh Brenner mit Flammrohr
US20030095920A1 (en) * 2001-11-21 2003-05-22 Holger Schlichting Process of producing synthesis gas
US20050079458A1 (en) * 2003-10-13 2005-04-14 Webasto Ag Heater with an atomizer nozzle
US20090220903A1 (en) * 2004-11-17 2009-09-03 Webasto Ag Burner for a heater with improved heat shield
US20090220902A1 (en) * 2004-11-17 2009-09-03 Webasto Ag Burner for a heater with improved baffle plate
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

Also Published As

Publication number Publication date
RU2361107C2 (ru) 2009-07-10
JP2008520949A (ja) 2008-06-19
KR20070086043A (ko) 2007-08-27
RU2007122480A (ru) 2008-12-27
WO2006053541A1 (de) 2006-05-26
CA2601319A1 (en) 2006-05-26
DE112005003410A5 (de) 2007-10-25
CN101103226A (zh) 2008-01-09
EP1812747A1 (de) 2007-08-01

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AS Assignment

Owner name: WEBASTO SE, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:POHNER, MICHAEL;WIDEMANN, FRIEDRICH;WEBER, STEFFEN;AND OTHERS;SIGNING DATES FROM 20110307 TO 20110331;REEL/FRAME:028855/0286

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION