EP1657489A1 - Mélangeur de brûleur à prémélange - Google Patents

Mélangeur de brûleur à prémélange Download PDF

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Publication number
EP1657489A1
EP1657489A1 EP05023841A EP05023841A EP1657489A1 EP 1657489 A1 EP1657489 A1 EP 1657489A1 EP 05023841 A EP05023841 A EP 05023841A EP 05023841 A EP05023841 A EP 05023841A EP 1657489 A1 EP1657489 A1 EP 1657489A1
Authority
EP
European Patent Office
Prior art keywords
gas
displacement body
combustion air
mixing device
swirl
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.)
Granted
Application number
EP05023841A
Other languages
German (de)
English (en)
Other versions
EP1657489B1 (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.
  • DE 197 33 769 C2 discloses a fuel gas introduction device for a gas premix burner, is injected in the fuel gas in the intake of a radial blower and is offset by the influence of the impeller in a swirling motion.
  • a fuel gas introduction device for a gas premix burner is known, which consists of a Venturi tube, which is traversed in the direction of the tube axis of air.
  • 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.
  • DE 197 29 047 C1 contains 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, annular order the combustion air duct arranged gas supply channel, which opens upstream of the fan in the combustion air duct, wherein a swirl body and downstream of a separate nozzle-like displacement body are inserted into the combustion air duct. Downstream of the cross-sectional constriction, gas is added.
  • 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 jacket 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)
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 true EP1657489A1 (fr) 2006-05-17
EP1657489B1 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202000004048A1 (it) * 2020-02-27 2021-08-27 Nordgas S R L Dispositivo di adduzione aria e gas per caldaie a gas.

Families Citing this family (2)

* 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

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2125696A1 (de) * 1971-05-24 1973-01-18 Heinz Handschack Mischduese zur mischung brennbarer gase, insbesondere fuer geblaesebrenner
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
WO2002029319A1 (fr) 2000-10-03 2002-04-11 Sit La Precisa S.P.A. Melangeur air-gaz ameliore
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
DE202004006645U1 (de) * 2004-04-27 2004-08-26 Buderus Heiztechnik Gmbh Luftleiteinrichtung für einen Gasbrenner

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2125696A1 (de) * 1971-05-24 1973-01-18 Heinz Handschack Mischduese zur mischung brennbarer gase, insbesondere fuer geblaesebrenner
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
WO2002029319A1 (fr) 2000-10-03 2002-04-11 Sit La Precisa S.P.A. Melangeur air-gaz ameliore
DE202004006645U1 (de) * 2004-04-27 2004-08-26 Buderus Heiztechnik Gmbh Luftleiteinrichtung für einen Gasbrenner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202000004048A1 (it) * 2020-02-27 2021-08-27 Nordgas S R L Dispositivo di adduzione aria e gas per caldaie a gas.
WO2021170368A1 (fr) * 2020-02-27 2021-09-02 Nordgas S.R.L. Dispositif d'alimentation en air et en gaz pour chaudières à gaz

Also Published As

Publication number Publication date
EP1657489B1 (fr) 2013-03-27
DE102004054796B3 (de) 2006-03-16

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