EP1657489B1 - Mélangeur de brûleur à prémélange - Google Patents

Mélangeur de brûleur à prémélange Download PDF

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Publication number
EP1657489B1
EP1657489B1 EP05023841A EP05023841A EP1657489B1 EP 1657489 B1 EP1657489 B1 EP 1657489B1 EP 05023841 A EP05023841 A EP 05023841A EP 05023841 A EP05023841 A EP 05023841A EP 1657489 B1 EP1657489 B1 EP 1657489B1
Authority
EP
European Patent Office
Prior art keywords
swirl
gas
displacement body
combustion air
mixing device
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.)
Not-in-force
Application number
EP05023841A
Other languages
German (de)
English (en)
Other versions
EP1657489A1 (fr
Inventor
Rainer Rausch
Heinrich Oehler
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
Publication of EP1657489A1 publication Critical patent/EP1657489A1/fr
Application granted granted Critical
Publication of EP1657489B1 publication Critical patent/EP1657489B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • 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
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air

Definitions

  • the invention relates to a mixing device for a gas premix burner according to the preamble of claim 1.
  • Generic gas premix burners have a fan for conveying a gas / air mixture to a burner surface. Upstream, the combustion air flow from a combustion air duct enters a mixing device. There, gas is added from a gas supply channel, which opens upstream of the fan in the combustion air duct and is connected to a gas valve. Important for good combustion results is generally a very homogeneous composition of the gas / air mixture. This can be achieved either by intensive mixing or long flow paths to homogenize the mixture, so that the known injection of gas upstream of the blower offers advantages.
  • a fuel gas introduction device for a gas premix burner is injected in the fuel gas in the intake of a radial fan and offset by the influence of the impeller in a swirling motion.
  • JP 08128609 A is known from the DE 197 33 768 C2 , which consists of a Venturi tube, which is traversed in the direction of the tube axis of air. In the narrowest area of the Venturi tube, an inflow pipe for fuel gas protrudes into the combustion air duct. This is arranged eccentrically and the inflow opening opens substantially parallel to the longitudinal axis of the Venturi tube.
  • a mixing device for generating a gas / air mixture for a burner, which is also to be arranged upstream of a blower.
  • a tubular venturi having a Venturi nozzle is provided, in the nozzle throat gas via an annular gap, from a part of the Venturi nozzle surrounding annular chamber, is sucked. This occurs approximately tangentially to the air flow within the Venturi nozzle.
  • a throttle body is arranged in the outlet region of the Venturi nozzle.
  • a mixing device for a gas premix burner consisting of a combustion air duct, which flows downstream into a fan for conveying the gas / air mixture to a burner surface, and connected to a gas fitting, annularly arranged around the combustion air duct gas supply channel, which upstream leading into the combustion air duct upstream of the blower, wherein a swirl body and downstream a separate nozzle-like displacement body are inserted into the combustion air duct. Downstream of the cross-sectional constriction, gas is added.
  • the US Pat. No. 4,033,714 relates to a mixing device consisting of a combustion air duct, which flows downstream into a blower for conveying the gas / air mixture to a burner surface. It is a connected to a gas valve, annular, provided around the combustion staged duct gas supply channel, which opens upstream of the fan in the combustion air duct.
  • a displacement body is used in the combustion air duct, which forms a cross-sectional constriction in the combustion air duct and with its outer shell a wall of the gas supply duct. Downstream of the cross-sectional constriction, at the mouth of the displacer, the gas is admixed. It is fed between the outer shell of the displacement body and an associated receptacle.
  • the jacket of the displacement body and the associated receptacle are conical.
  • Gas heaters require modulating the burner output over the widest possible range, in particular down to about 20 percent of the maximum burner output. It should thus be achieved a variable performance adjustment to the current heat demand and a good overall efficiency through optimal utilization of condensing. In addition, burner starts, which possibly lead to slightly more exhaust emissions for a short time, are avoided. Therefore, a mixing device for a generic gas premix burner must ensure an optimal, homogeneous gas / air mixture in all operating situations.
  • the invention is therefore based on the object to produce a homogeneous gas / air mixture for a gas premix burner with a wide modulation range in order to achieve optimum combustion results.
  • the mixing device is characterized in that a swirling and / or displacement body is inserted into the combustion air duct and forms a cross-sectional constriction in the combustion air duct and with its outer jacket a wall of the gas supply duct. Downstream of the cross-sectional constriction, at the mouth of the swirl and / or displacement body, the gas is admixed.
  • the mantle of the swirling and / or displacement body bears against a surface serving as a depth stop in the axial direction in the combustion air duct or at elevations or projections on the receptacle. This results in a distance to the receptacle and thus an annular gap or more openings for the passage of gas, for example, if channels are incorporated into the surface of the receptacle. In the immediate vicinity of the annular gap or to the openings for the passage of gas, an edge pointing in the direction of flow is attached to the casing of the swirling and / or displacement body in the discharge area.
  • a cylindrical, approximately concentric with the combustion air duct area may be provided on a portion of the shell.
  • the swirl and / or displacement body has inside a tapered in the downstream direction free flow cross-section and a plurality of inclined employees, surface, rib-like guide elements. These extend with their outer edges to the inner wall of the shell and are fixed there.
  • the guide elements are connected to each other and in the center of the swirling and / or displacement body, in the region in front of the mouth, they together form an upstream pointing, conical or pyramidal tip as a flow barrier.
  • the length of the interconnected guide elements corresponds approximately to the total length of the swirl and / or displacement body. Particularly good mixing results are achieved if the twisting direction generated by the swirling and / or displacement body and the running direction of the blower match. In the reverse case, that is, when the twisting direction and the running direction of the blower are not the same, flow noise can be reduced particularly well.
  • a very homogeneous gas / air mixture for a gas premix burner with a wide modulation range is generated, so that optimum combustion results are achieved.
  • a very simple, flexible design is ensured, in which many parameters can be changed easily, for example, to create burners of different performance sizes and at the same time to retain as many components as possible.
  • These are essentially the measure of the annular gap with respect to the associated, conical receiving by axial displacement or change of the swirl and / or displacement body, the twist angle, the twisting direction and the displacement ratio or the throttle resistance.
  • the conversion to another type of gas is only by changing a throttle body in the gas supply duct.
  • the mixing device consists of a substantially cylindrical combustion air duct 1, which opens downstream into a blower 2 for conveying the gas / air mixture, with a swirling and / or displacement body 3.
  • Ring-shaped around the combustion air duct 1 is a gas supply duct 4 in the housing 5 arranged.
  • the swirl and / or displacement body 3 forms a cross-sectional constriction in the combustion air duct 1 and with its outer shell 6 a wall of the gas supply channel 4. Downstream of the cross-sectional constriction, at the mouth of the swirl and / or displacement body 3, the gas is in the flow direction over a Ring gap 7 mixed. This results between the outer jacket 6 of the swirl and / or displacement body 3 and an associated receptacle 8.
  • At least one embossed elevation 10 on the outside of the jacket 6 serves as a spacer to the associated surface of the receptacle 8.
  • the swirl and / or displacement body 3 At its orifice, in the immediate vicinity of the annular gap 7 for the passage of gas, the swirl and / or displacement body 3 has an approximately pointing in the flow direction edge 11 for flow guidance.
  • a connecting piece 14 is provided for an air supply line on the combustion air duct 1, upstream of the swirl and / or displacement body 3, wherein this is preferably formed directly on the wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Claims (6)

  1. Dispositif de mélange pour un brûleur à gaz à prémélange, se composant d'un canal d'air de combustion (1), lequel débouche en aval dans un ventilateur (2) pour faire circuler le mélange gaz/air vers une surface du brûleur, ainsi que d'un canal d'alimentation en gaz (4) raccordé à un robinet à gaz et qui est disposé annulairement autour du canal d'air de combustion (1) et qui débouche en amont du ventilateur (2) dans le canal d'air de combustion (1), un élément déflecteur et/ou de tourbillonnement (3) étant mis en place dans le canal d'air de combustion (1), lequel forme une réduction de section dans le canal d'air de combustion (1) ainsi qu'une paroi du canal d'alimentation en gaz (4) grâce à son enveloppe extérieure (6), moyennant quoi en aval de la réduction de section, au débouché de l'élément déflecteur et/ou de tourbillonnement (3), le gaz est ajouté par mélange, le gaz étant amené entre l'enveloppe extérieure (6) de l'élément déflecteur et/ou de tourbillonnement (3) et un logement (8) associé et l'enveloppe (6) de l'élément déflecteur et/ou de tourbillonnement (3) ainsi que le logement (8) associé étant réalisés de manière conique,
    l'enveloppe (6) de l'élément déflecteur et/ou de tourbillonnement (3) reposant contre une surface servant de butée basse en direction axiale dans le canal d'air de combustion (1) ou contre des surélévations (10) ou saillies sur le logement (8), en restant ainsi à distance du logement (8) et en libérant une fente annulaire (7) ou plusieurs ouvertures pour le passage du gaz, caractérisé en ce que l'enveloppe (6) de l'élément déflecteur et/ou de tourbillonnement (3) possède à son débouché, à proximité immédiate de la fente annulaire (7) ou des ouvertures pour le passage du gaz, une arête (11) pointant sensiblement en direction de circulation ou bien sur une pièce partielle, une zone cylindrique sensiblement concentrique avec le canal d'air de combustion (1).
  2. Dispositif de mélange selon la revendication 1,
    caractérisé en ce que l'élément déflecteur et/ou de tourbillonnement (3) possède à l'intérieur une section de passage libre s'amenuisant en direction vers l'aval ainsi que plusieurs éléments de conduite (12) en nappe, semblables à des nervures, placés en biais, lesquels vont avec leurs arêtes extérieures jusqu'à la paroi interne de l'enveloppe (6) et y sont fixés.
  3. Dispositif de mélange selon la revendication 2,
    caractérisé en ce que les éléments de conduite (12) sont reliés ensemble et forment, au centre de l'élément déflecteur et/ou de tourbillonnement (3), dans la zone devant le débouché de celui-ci, une pointe (13) de forme conique ou pyramidale pointant vers l'amont en guise de barrière d'écoulement.
  4. Dispositif de mélange selon la revendication 3,
    caractérisé en ce que la longueur des éléments de conduite (12) reliés ensemble correspond sensiblement à la longueur totale de l'élément déflecteur et/ou de tourbillonnement (3).
  5. Dispositif de mélange selon l'une des revendications 1 à 4,
    caractérisé en ce que la direction de tourbillonnement produite avec l'élément déflecteur et/ou de tourbillonnement (3) et le sens de course du ventilateur (2) sont identiques.
  6. Dispositif de mélange selon l'une des revendications 1 à 5,
    caractérisé en ce que le canal d'air de combustion (1) présente en amont un manchon de raccordement (14) pour un conduit d'alimentation d'air.
EP05023841A 2004-11-12 2005-11-02 Mélangeur de brûleur à prémélange Not-in-force EP1657489B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410054796 DE102004054796B3 (de) 2004-11-12 2004-11-12 Mischeinrichtung für einen Gas-Vormischbrenner

Publications (2)

Publication Number Publication Date
EP1657489A1 EP1657489A1 (fr) 2006-05-17
EP1657489B1 true EP1657489B1 (fr) 2013-03-27

Family

ID=35563507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05023841A Not-in-force EP1657489B1 (fr) 2004-11-12 2005-11-02 Mélangeur de brûleur à prémélange

Country Status (2)

Country Link
EP (1) EP1657489B1 (fr)
DE (1) DE102004054796B3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009024269A1 (de) * 2009-06-05 2010-12-09 Honeywell Technologies S.A.R.L. Mischvorrichtung für einen Gasbrenner
DE102010048626A1 (de) * 2010-10-15 2012-04-19 Friedrich Boysen Gmbh & Co. Kg Mischeinrichtung
IT202000004048A1 (it) * 2020-02-27 2021-08-27 Nordgas S R L Dispositivo di adduzione aria e gas per caldaie a gas.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2125696C3 (de) * 1971-05-24 1975-10-02 Gas-Feuerungen Heinz Handschack & Co, 8130 Starnberg Mischdüse für einen Gasbrenner, insbesondere einen Gebläsegas brenner
US4033714A (en) 1972-04-17 1977-07-05 Radiation Limited Gaseous fuel burners
JPH08128609A (ja) 1994-10-31 1996-05-21 Miura Co Ltd 燃料ガス混合機構を備えた送風機
DE19729047C1 (de) * 1997-07-08 1998-09-24 Honeywell Bv Mischvorrichtung zur Erzeugung eines Gemisches aus Gas und Verbrennungsluft für einen Brenner
DE19733769C2 (de) 1997-08-05 2003-05-22 Dungs Karl Gmbh & Co Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
DE19733768C2 (de) * 1997-08-05 2003-06-26 Dungs Karl Gmbh & Co Brenngas-Einleitungsvorrichtung für einen Gas-Vormischbrenner
IT1315743B1 (it) * 2000-10-03 2003-03-18 Sit La Precisa Spa Dispositivo miscelatore aria-gas perfezionato.
DE202004006645U1 (de) * 2004-04-27 2004-08-26 Buderus Heiztechnik Gmbh Luftleiteinrichtung für einen Gasbrenner

Also Published As

Publication number Publication date
EP1657489A1 (fr) 2006-05-17
DE102004054796B3 (de) 2006-03-16

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