US20130344447A1 - Oil premix burner - Google Patents

Oil premix burner Download PDF

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Publication number
US20130344447A1
US20130344447A1 US13/922,009 US201313922009A US2013344447A1 US 20130344447 A1 US20130344447 A1 US 20130344447A1 US 201313922009 A US201313922009 A US 201313922009A US 2013344447 A1 US2013344447 A1 US 2013344447A1
Authority
US
United States
Prior art keywords
swirl
oil
injection device
generating device
combustion air
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
US13/922,009
Other languages
English (en)
Inventor
Antonio MEDEIROS
Raphael Lang
Rainer Rausch
Thomas GESCHWEND
Sadik Cecen
Hans-Joachim Ripplinger
Thorsten Schroeder
Juergen HETCHE
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MEDEIROS, ANTONIO, HETCHE, JUERGEN, LANG, RAPHAEL, RIPPLINGER, HANS-JOACHIM, Cecen, Sadik, GESCHWEND, THOMAS, RAUSCH, RAINER, SCHROEDER, THORSTEN
Publication of US20130344447A1 publication Critical patent/US20130344447A1/en
Abandoned legal-status Critical Current

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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
    • F23D11/10—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
    • F23D11/106—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 at the burner outlet
    • F23D11/107—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 at the burner outlet at least one of both being subjected to a swirling motion
    • 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
    • F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
    • 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
    • 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
    • F23D11/44—Preheating devices; Vaporising devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • F23L15/04—Arrangements of recuperators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Definitions

  • the present invention relates to an oil premix burner having a combustion element.
  • Such oil premix burners have a cylindrical combustion element having a burner surface on the outer lateral surface. Round about a central oil injection device there is a distribution chamber, as a rule, for the oil mist being created, so that the latter uniformly reaches the burner surface from within.
  • the combustion air gets into the distribution chamber via at least one inflow opening in the vicinity of the oil injection device, which may be an injection valve or an oil nozzle which is fastened to a nozzle holder having an oil preheater.
  • premix burners In the case of gas burners, in particular, which are operated in a modulating manner, that is, in which the performance range is able to be controlled between a small proportion of the maximum performance and the maximum performance, the so-called premix burners have proven successful.
  • the fuel and the combustion air required for its combustion are mixed locally separated from the flame and are then combusted.
  • a cylindrical combustion element is mostly used as flame holder, which is permeable to the fuel/air mixture and encloses an internal space to which the fuel/air mixture is supplied.
  • small flames are able to be realized having good exhaust gas values, relatively small flame holders and large modulation ranges.
  • the basic principle of an oil premix burner is the mixing of finely atomized oil with preheated air. Because of this principle, it is possible that a so-called cold flame forms, for example, so that the fuel is able to be combusted over a surface. The surface combustion is, however, also possible without a cold flame. Generally, the heating of air is relatively difficult because of its low heat capacity, because to do it, either an effective heat transition via a wall to the air flow and/or high wall temperatures are required.
  • An oil premix burner is known, for instance, from published German patent application document DE 10 2006 000 174 A1.
  • the fact is used that hot air vaporizes the oil, and consequently a gas mixture is able to be formed which, just as in a gas premix burner, moves all the way through the flame holder and burns off.
  • the formation of nitrogen oxides is reduced in addition, and it is intended that thereby the start-up response is improved, because the operating point is reached relatively rapidly.
  • the combustion air is guided for the take-up of heat by a conducting device that rises, at least in sections, over a burner surface and is guided at a distance from the burner flame, and is accelerated in a nozzle in the guiding device, so that the exhaust gas is able to be aspirated from the combustion chamber and mixed with the air.
  • An oil premix burner is known from German utility model DE 20 2008 005 913 U1, in which an air heat exchanger is assigned for the preheating of the combustion air, which is made up of at least one channel encompassing the combustion element at a distance. It is made up of channels running next to one another, situated in parallel, but flowed through in series, which are both acted upon from the outside by heat from the burner flame.
  • each double tube element is connected to the combustion air channel at its entry side of the inner tube.
  • the combustion air enters and in each case, after leaving the inner tube at a turnaround zone, it gets to the end face of the free end into the annular space formed between the inner tube and the outer tube.
  • this annular space there flows the air, already preheated, back in the direction of the end face close to the oil injection device, and absorbs additional heat. There, it enters into the distribution chamber as preheated combustion air in the region about the oil injection device.
  • the inner tube projects beyond the outer tube in the longitudinal direction at the end near the oil injection device, so that it reaches through the discharge region of the annular gap that is in connection with the distribution chamber and reaches through a limiting wall all the way into the combustion air channel.
  • the present invention is therefore based on the object of optimizing the combustion quality and the robustness, particularly with respect to the modulation capability, of an oil premix burner.
  • the oil premix burner is characterized in that, in each case, the annular space formed between the inner tube and the outer tube of all double tube elements opens out into an annular-shaped collection chamber, and the preheated combustion air, starting from this collection chamber, flows inwards via a swirl-generating device into the area around the oil injection device into the distribution chamber.
  • the swirl-generating device having flow from the outside to the inside, is developed ring-shaped and symmetrically to the center of the oil injection device.
  • the swirl-generating device is designed as an annular disk, which is enclosed on both sides in the axial direction by associated limiting walls and has channels in the radial direction for the combustion air.
  • the swirl-generating device is preferably developed as an annular disk and, in the circumferential direction, has a uniform wave-shaped construction of alternating channels, the wave-shaped outer sides each lying against associated limiting walls, and between the internal wave sides and the limiting walls, lying respectively opposite, a channel is developed in each case for the combustion air.
  • the channels advantageously have the form of flat channels in each case having an essentially rectangular flow-through cross section.
  • the outer wave sides are each equipped with one elongated hole which runs in the direction of a channel, and is used among other things, for welding onto a limiting wall, as well as for tension equalization during a bending process.
  • the channels of the swirl-generating device have a radial angle of incidence, this amounting to approximately within the range of 30 degrees to 75 degrees to the mid-perpendicular.
  • a further advantageous specific embodiment provides that the swirling direction able to be achieved using the swirl-generating device is adjusted to the central oil injection device, especially its spraying behavior.
  • the swirling direction of the air flow accelerated using the swirl-generating device is equal to the swirling direction of the oil spray accelerated correspondingly using the central oil injection device.
  • an associated cone is situated at a distance about the central oil injection device, which forms the transition of the limiting wall close to the combustion rod of the swirl-generating device into the distribution chamber.
  • the cone preferably extends at least over about one-fifth of the length of the distribution chamber and tapers in the flow direction in such a way that the entry diameter is at least 5 percent greater than the exit diameter.
  • the outer diameter of the swirl-generating device is advantageously less than the pitch diameter of the double tube elements and the internal diameters of the swirl-generating device are designed to be greater than, or equal to the inner diameter of the cone about the central oil injection device.
  • both the combustion quality and the robustness are improved in oil premix burners.
  • the system according to the present invention having the integrated air heat exchanger is advantageous, particularly for modulating operation. This applies for burners having a cylindrical combustion element the same as for batwing burners having a horizontal burner surface and the design according to the invention.
  • the flame burns on, or rather in the burner surface, so that, in the process, above it, energy is coupled out and used for heating the combustion air. That being the case, one may omit electrical air preheating during the stationary burner operating state. This has a positive effect on the energy balance of the burner.
  • One considerable advantage of the air preheating function according to the present invention is that with increasing burner surface, for instance, in a combustion element for larger performance ranges, the heat exchanger surface may also be extended to the same degree, by simply using longer double tube elements. With that, the air temperature striven for remains constant.
  • Each tube is defined by its specific performance density and the number of tubes as a function of the overall performance.
  • no constructive changes are required, for the representation of different burner performance variables, on the periphery or other burner components.
  • the remaining burner construction is maintained exactly as the requirements on the surrounding combustion chamber.
  • An enlargement of the passage cross section in the swirl-generating device developed as an annular disk is very simply implemented by increasing the wave-shaped forming. Then, one only has to offset the limiting wall directed upstream, i.e. towards the combustion air channel, slightly, in order to equalize the gap width for a slightly thicker annular disk.
  • combustion air is to be provided at all burner operating points having a minimum temperature of ca. 350° C.
  • the maximum admissible surface temperature at the air heat exchanger is maintained.
  • an intensive swirling of the entire preheated air flow is achieved in the immediate vicinity of the oil injection device. Varying the swirl-generating device, particularly the annular disk is easily possible. Therefore, from performance variable to performance variable, an adjustment of the swirling effect may take place, for example. This is meaningful in the case of different and especially adapted oil injection devices, for instance, having a changed spray image, a varying spray intensity or a specified rotation of the spray image. Consequently, an intensive and complete thorough mixing is assured of oil mists and combustion air for various performance variables and different operating states.
  • the present invention also yields advantages with respect to very slight pressure loss and scalability in the supply path of the combustion air.
  • FIG. 1 shows an oil premix burner in longitudinal section.
  • FIG. 2 shows a perspective view of a swirl-generating device.
  • the oil premix burner is made up essentially of a combustion element 1 , having a burner surface (not shown) on the outer lateral surface, a distribution chamber 2 below the burner surface, a central oil injection device 3 , a combustion air channel 4 connected to a blower situated upstream as well as an air heat exchanger for the preheating of the combustion air in the area of the burner surface.
  • the latter is made up of a plurality of double tube elements 5 that are distributed over the circumference, that extend with their axes parallel to combustion element 1 and have parallel flows through them, and having an inner tube 6 and an outer tube 7 having flows through them in series.
  • each double tube element 5 is connected with the entry side of inner tube 6 to combustion air channel 4 .
  • the combustion air in each case, in a turnaround zone 8 at the end face of the free end gets into annular space 9 that is formed between inner tube 6 and outer tube 7 , and flows back in the direction of the end face close to the oil injection device.
  • annular space 9 of all double tube elements 5 formed in each case between inner tube 6 and outer tube 7 , opens out into an annular collecting chamber 10 .
  • the preheated combustion air starting from this collection chamber 10 , flows inwards via a swirl-generating device 11 , into the region about oil injection device 3 , into distribution chamber 2 .
  • swirl-generating device 11 is developed to be annular and symmetrical to the center of oil injection device 3 .
  • this is as an annular disk, which is enclosed on both sides in the axial direction by associated limiting walls 12 , 13 and has channels in the radial direction for the combustion air.
  • the circumferential direction there comes about a uniform wave-shaped construction of alternating channels, the wavy outer sides 14 , 15 lying in each case against limiting walls 12 , 13 and between the waves' inner sides and the respectively opposite limiting wall 14 , 15 a flat channel is developed in each case for the combustion air.
  • the outer wave sides 14 , 15 are each equipped with one elongated hole 16 , which runs in the direction of a channel, and is used among other things, for welding onto a limiting wall 12 , 13 as well as for tension compensation during a bending process.
  • Cone 17 extends at least over about one-fifth of the length of distribution chamber 2 and into it, and tapers while on this path.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
US13/922,009 2012-06-26 2013-06-19 Oil premix burner Abandoned US20130344447A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012012539.9A DE102012012539A1 (de) 2012-06-26 2012-06-26 Ölvormischbrenner
DE102012012539.9 2012-06-26

Publications (1)

Publication Number Publication Date
US20130344447A1 true US20130344447A1 (en) 2013-12-26

Family

ID=48655983

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/922,009 Abandoned US20130344447A1 (en) 2012-06-26 2013-06-19 Oil premix burner

Country Status (3)

Country Link
US (1) US20130344447A1 (fr)
EP (1) EP2679897B1 (fr)
DE (1) DE102012012539A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150102117A1 (en) * 2013-10-14 2015-04-16 Eberspächer Climate Control Systems GmbH & Co. KG Combustion chamber assembly unit for a vaporizing burner
CN108167857A (zh) * 2017-12-22 2018-06-15 东南大学 一种高效套管式暖风器装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3087532A (en) * 1958-08-01 1963-04-30 Exxon Research Engineering Co Method of reducing noise in oil burners
US20090107489A1 (en) * 2007-10-29 2009-04-30 Gee Randy C Solar thermal energy collector

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1082576A (en) 1912-03-23 1913-12-30 William Albert White Furnace-front.
FR1148255A (fr) * 1955-04-29 1957-12-05 Bataafsche Petroleum Dispositif de combustion
FR2080088A6 (fr) 1970-02-23 1971-11-12 Chaudronnerie Entr Indle
DE2339125A1 (de) * 1973-08-02 1975-02-13 Volkswagenwerk Ag Drallscheibe fuer einen brenner
DE2358187A1 (de) * 1973-11-22 1975-05-28 Ernst Schweppe Vorrichtung an oelbrennern, insbesondere fuer warmwasserheizungen
DE2643293A1 (de) 1976-09-25 1978-03-30 Herbert Ahlgrimm Oelbrenner
US4389185A (en) * 1980-10-31 1983-06-21 Alpkvist Jan A Combustor for burning a volatile fuel with air
ATE374904T1 (de) * 2001-03-20 2007-10-15 Riello Spa Ölbrenner
DE10144400B4 (de) * 2001-09-10 2005-10-13 Webasto Ag Vorrichtung zum Einbringen eines Brennstoff/Luft-Gemisches in einen Brenner
DE10218623B4 (de) * 2002-04-25 2004-03-25 Webasto Thermosysteme International Gmbh Zerstäuberbrenner für ein Heizgerät
DE102006000174B9 (de) 2006-04-13 2009-04-16 Honeywell Technologies Sarl Öl-Vormischbrenner und Betriebsverfahren dafür
DE202008005913U1 (de) 2008-04-29 2009-09-03 Robert Bosch Gmbh Ölvormischbrenner
DE102010046733B4 (de) 2010-09-28 2012-08-02 Robert Bosch Gmbh Ölvormischbrenner

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3087532A (en) * 1958-08-01 1963-04-30 Exxon Research Engineering Co Method of reducing noise in oil burners
US20090107489A1 (en) * 2007-10-29 2009-04-30 Gee Randy C Solar thermal energy collector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150102117A1 (en) * 2013-10-14 2015-04-16 Eberspächer Climate Control Systems GmbH & Co. KG Combustion chamber assembly unit for a vaporizing burner
US9897311B2 (en) * 2013-10-14 2018-02-20 Eberspächer Climate Control Systems GmbH & Co. KG Combustion chamber assembly unit for a vaporizing burner
CN108167857A (zh) * 2017-12-22 2018-06-15 东南大学 一种高效套管式暖风器装置

Also Published As

Publication number Publication date
EP2679897B1 (fr) 2015-08-12
DE102012012539A1 (de) 2014-01-02
EP2679897A1 (fr) 2014-01-01

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Legal Events

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AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MEDEIROS, ANTONIO;LANG, RAPHAEL;RAUSCH, RAINER;AND OTHERS;SIGNING DATES FROM 20130711 TO 20130904;REEL/FRAME:031402/0764

STCB Information on status: application discontinuation

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