EP0295157B1 - Luftverteilungsvorrichtung für einen Gebläsebrenner - Google Patents

Luftverteilungsvorrichtung für einen Gebläsebrenner Download PDF

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Publication number
EP0295157B1
EP0295157B1 EP88401130A EP88401130A EP0295157B1 EP 0295157 B1 EP0295157 B1 EP 0295157B1 EP 88401130 A EP88401130 A EP 88401130A EP 88401130 A EP88401130 A EP 88401130A EP 0295157 B1 EP0295157 B1 EP 0295157B1
Authority
EP
European Patent Office
Prior art keywords
slots
air
burner
turbine
sleeve
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.)
Expired - Lifetime
Application number
EP88401130A
Other languages
English (en)
French (fr)
Other versions
EP0295157A1 (de
Inventor
Nicolas Chaumier
Roland Kalms
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.)
AIRELEC INDUSTRIES
Original Assignee
AIRELEC INDUSTRIES
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 AIRELEC INDUSTRIES filed Critical AIRELEC INDUSTRIES
Priority to AT88401130T priority Critical patent/ATE58785T1/de
Publication of EP0295157A1 publication Critical patent/EP0295157A1/de
Application granted granted Critical
Publication of EP0295157B1 publication Critical patent/EP0295157B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F23C7/008—Flow control devices
    • 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

Definitions

  • the present invention relates to an air distribution device for a supply air burner, of the type comprising, downstream of a turbine arranged laterally with respect to the burner, a certain number of longitudinal slots distributed over a cylindrical surface disposed axially with respect to the burner and a plug capable of being actuated in the axial direction in order to partially close said slots for the purpose of adjusting the air intake (see, for example, DE-A 3 433 201).
  • the air-fuel, or more generally oxidant-fuel, mixture is produced in a flame tube comprising a flame holder whose purpose is to rotate an air mass.
  • the intimate air-fuel mixture must be as homogeneous as possible in order to obtain complete combustion. An excess of air is therefore expected, but for reasons of efficiency, this should be as small as possible.
  • no area of the mixture, and therefore of the flame must be locally lacking air.
  • combustion air which passes through the flame tube is generally divided into a so-called primary air flow, rotated by the flame holder, which mixes directly with the fuel, and an air flow said secondary, passing around the flame holder and which has the function of "pinching" the flame and ventilating its periphery.
  • a burner is designed to respond to a certain range of power between a maximum power and a minimum power. Consequently, since the quality of combustion must be maintained over the entire power range, it is necessary, once the calorific flow rate has been set, to adjust the air flow rate to its fair value.
  • the main object of the present invention is therefore to remedy these drawbacks and, to do this, it relates to an air distribution device of the aforementioned type which is essentially characterized in that the passage section of said slots increases progressively as and as one is further away from the air flow generated by the turbine.
  • the slots have a point-shaped profile and are oriented with respect to the plug so that the point corresponds to the lowest air flow.
  • the profile of the slots is designed so that the variation in passage cross section between the different slots varies as a function of the axial position of the plug.
  • the variation is practically zero for low air flows, increasing for average flows and constant for large flows.
  • the burner shown in FIG. 1 comprises first of all, in a manner known per se, a flame tube or barrel 1 inside which is disposed a fuel injector 2.
  • the flame tube 1 is fixed on a cylindrical casing 3 into which there opens laterally a sheath 4 fitted with a turbine 5 intended to blow air inside the burner.
  • the casing is closed by a cover 6, commonly known as the combustion head cover.
  • the fuel injector 2 is centered inside the flame tube 1 by means of a sliding sleeve 7 on which are fixed four wings 8 which come to bear on the inner wall of the tube.
  • the injector ends with a nozzle 9 and in front of the nozzle is arranged a flame catch 10 provided in its center with stamped cutouts 11.
  • the flame catch is fixed on the front end of the wings 8 and is supported at its periphery on six fins 12 integral with the wall of the flame tube 1.
  • the air blown inside the burner by the turbine 5 is thus divided into a primary flow rotated by the cutouts 11 and a secondary flow which passes around the flame holder 10.
  • the position of the flame holder relative to the nozzle 9 can be adjusted by means of a fixing screw 13 intended to make the sliding sleeve 7 integral with the injector.
  • the injector is extended by a fuel supply tube 14, for example fuel oil, which passes axially through the cover 6 via an opening 15.
  • a fuel supply tube 14 for example fuel oil
  • An adjustment knob 16 accessible from the exterior and cooperating with a threaded part of the tube 14, allows the position of the injector / flame holder assembly to be adjusted inside the flame tube 1. The rotation of this assembly is prevented by a tongue 17, integral of the tube 14 and engaging in a slot 18 provided on the cover 6.
  • An electrical fuel preheater 19 is also provided on the injector 2, the supply cable 20 of which passes through the cover 6 via an opening 21.
  • the burner is ignited by means of two electrodes such as 22, each supported by an electrode holder 23 and whose high-voltage power cable 24 passes through the cover via an opening 25.
  • the cover 6 further comprises an inspection eyelet 26 and an opening 27 for the establishment of a photoresist cell 28 for detecting the presence of the flame.
  • the cover 6 is provided on its internal wall with a cylindrical surface 29, disposed axially with respect to the burner and in which a number of longitudinal slots 30 are formed through which the air blown by the turbine 5 gets inside the burner.
  • the passage section of these slots 30 is controlled by means of a cylindrical plug 31, placed inside the cylindrical surface 29 and which is capable of moving axially under the action of a system of screws 32 and nut 33.
  • the screw 32 is rotatably mounted in an opening 34 of the cover 6 so as to be accessible from the outside, while the nut 33 is made integral with the plug 31 by means of a tongue 35.
  • this tongue 35 protrudes outside through a slot 36 in the cover, thus forming a strip 37 which is advantageously provided with graduations making it possible to control the position of the plug.
  • the passage section of the different slots 30 is not identical over the entire periphery of the surface 29, but gradually increases as one is further from the air flow generated by the turbine 5.
  • the slots formed in the cylindrical surface 29 are smaller on the side of the turbine 5 than on the opposite side, this in order to equalize the air flows as a function of the general direction of the flow.
  • each slot is double due to the presence in the center of a symmetrical triangular tooth with double slope 40.
  • the passage section of the slot thus depends both on the total height of the tooth and the height of the slope change. Thanks to this arrangement, the variation in passage cross-section, or asymmetry, between the different slots, changes as a function of the axial position of the plug 31.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Air Supply (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Gas Burners (AREA)

Claims (4)

1. Luftverteilungsvorrichtung für einen Gebläseluftbrenner, bei der nach einer am Brenner seitlich angeordneten Turbine (5) eine gewisse Anzahl von Längsschlitzen (30) vorgesehen sind, die auf einer axial am Brenner vorgesehenen zylindrischen Fläche (29) verteilt sind, sowie eine Büchse (31), die zum teilweisen Verschlissen der Schlitze zum Regeln der Luftzufuhr in axialer Richtung betätigt werden kann, dadurch gekennzeichnet, dass der Durchgangsquerschnitt der Schlitze (30) bei steigernder Entfernung von der von der Turbine (5) erzeugten Luftströmung allmählich zunimmt.
2. Vorrichntung nach Anspruch 1, dadurch gekennzeichnet, dass die Schlitze (30) ein spitzförmiges Profil aufweisen und bezüglich der Büchse so gerichtet sind, dass die Spitze dem geringsten Luftdurchfluss entspricht.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Profil der Schlitze (30) so ausgebildet ist, dass die veränderung des Durchgangsquerschnitts der verschiedenen Schlize je nach der axialen Position der Büchse (31) schwankt.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass bei geringem Luftdurchsatz praktisch keine Veränderung auftritt und dass die Veränderung bei mittlerem Durchsatz zunehmend und bei grossem Durchsatz konstant ist.
EP88401130A 1987-05-20 1988-05-09 Luftverteilungsvorrichtung für einen Gebläsebrenner Expired - Lifetime EP0295157B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88401130T ATE58785T1 (de) 1987-05-20 1988-05-09 Luftverteilungsvorrichtung fuer einen geblaesebrenner.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8707076A FR2615595B1 (fr) 1987-05-20 1987-05-20 Dispositif de distribution d'air pour bruleur a air souffle
FR8707076 1987-05-20

Publications (2)

Publication Number Publication Date
EP0295157A1 EP0295157A1 (de) 1988-12-14
EP0295157B1 true EP0295157B1 (de) 1990-11-28

Family

ID=9351267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88401130A Expired - Lifetime EP0295157B1 (de) 1987-05-20 1988-05-09 Luftverteilungsvorrichtung für einen Gebläsebrenner

Country Status (4)

Country Link
EP (1) EP0295157B1 (de)
AT (1) ATE58785T1 (de)
DE (1) DE3861170D1 (de)
FR (1) FR2615595B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1288866B1 (it) * 1996-03-22 1998-09-25 F I M Fonderia Ind Meccanich E Bruciatore perfezionato per generatore di calore

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3339191A1 (de) * 1982-10-29 1984-05-03 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Mit einem fluiden brennstoff gespeister brenner
DE3433201A1 (de) * 1984-09-10 1986-03-13 Hofamat Hoffmann GmbH & Co KG Öl- und Gasbrennerwerk, 7730 Villingen-Schwenningen Geblaesebrenner fuer heizungskessel, heizungsoefen o.dgl.

Also Published As

Publication number Publication date
FR2615595B1 (fr) 1989-08-18
ATE58785T1 (de) 1990-12-15
FR2615595A1 (fr) 1988-11-25
DE3861170D1 (de) 1991-01-10
EP0295157A1 (de) 1988-12-14

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