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EP0953804B1 - Flammstreifen für atmospherischen und vormischenden Brenner - Google Patents

Flammstreifen für atmospherischen und vormischenden Brenner Download PDF

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Publication number
EP0953804B1
EP0953804B1 EP99401012A EP99401012A EP0953804B1 EP 0953804 B1 EP0953804 B1 EP 0953804B1 EP 99401012 A EP99401012 A EP 99401012A EP 99401012 A EP99401012 A EP 99401012A EP 0953804 B1 EP0953804 B1 EP 0953804B1
Authority
EP
European Patent Office
Prior art keywords
slots
axis
flame
offset
outlet strip
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
EP99401012A
Other languages
English (en)
French (fr)
Other versions
EP0953804A1 (de
Inventor
Lila Menari
Stephen Daemon Andrews
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.)
Saunier Duval Eau Chaude Chauffage SDECC SA
Original Assignee
Saunier Duval Eau Chaude Chauffage SDECC SA
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 Saunier Duval Eau Chaude Chauffage SDECC SA filed Critical Saunier Duval Eau Chaude Chauffage SDECC SA
Publication of EP0953804A1 publication Critical patent/EP0953804A1/de
Application granted granted Critical
Publication of EP0953804B1 publication Critical patent/EP0953804B1/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
    • 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
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F23D14/583—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits

Definitions

  • the invention relates to a gas burner atmospheric and premixed and concerns more particularly the distribution of the outlet orifices of flame on the burner ramp according to the preamble of claim 1.
  • a gas burner atmospheric and premixed and concerns more particularly the distribution of the outlet orifices of flame on the burner ramp according to the preamble of claim 1.
  • Such a burner is known from document FR-A-2 319 080.
  • Gas burners in particular for bath heaters or boilers usually consist of two half-shells stamped lines delimiting the air-gas mixing chamber, the shells being assembled to form an orifice longitudinal, which is capped with a sheet metal grid provided a plurality of gas outlet ports.
  • the ramps of burner thus produced are generally placed side by side side and parallel to form a unit capable of operate with different kinds of gas.
  • a conventional embodiment of a burner ramp consists in piercing the flame outlet grid with a succession of orifices in the form of rectangular slots which are aligned close to one another.
  • the length of the strip covered by the orifices defines the total length of the flame obtained.
  • the surface covered by the flame obviously corresponds to the product of this total length by the width which is none other than the length of a slit.
  • the flame is thus concentrated and the flame front is delimited by the perimeter of the slots thus aligned.
  • the contact surface between the air and the flame corresponds to this perimeter, which limits the entry of cooling air; therefore the sheet metal parts adjacent to the slots are brought to high temperature and subjected to thermomechanical stresses; the production of No x linked to the flame temperature is therefore not negligible.
  • the invention provides a new solution in the arrangement of the flame exit orifices, which allows an increase in the flame front at the same time as a reduction in its thickness, and which goes in the direction of improving stability. flame, better cooling, and reduced emission of No x .
  • the subject of the invention is therefore an exit ramp from flames for atmospheric and premix gas burner comprising a sheet metal grid pierced with a succession of rectangular slots, ramp along which the slots are distributed on either side of the longitudinal axis of the grid and form a sinusoid extending over the entire length of the grid, which increases the length of the front of flames.
  • the slots are spaced apart others by a constant distance along the axis of the wire rack.
  • the slots are identical, each of them being offset from its immediate neighbor.
  • FIG. 1 a flame outlet grid formed of a sheet metal strip 1 from which are cut slots 2 which are distributed on either side of the longitudinal axis 3 of the grid, and arranged in lace.
  • Figure 2 shows these slots 2 of general rectangular shape.
  • the slots are identical and spaced from each other by a constant distance e along axis 3.
  • each slot perpendicular to this axis, each slot is offset from its neighbor immediate, with half a slot length demi / 2.
  • This half length l / 2 is preferable but not compulsory. Through example it could be variable between l / 5 and l / 0.5.
  • the ends of the slots form thus a sinusoid on either side of axis 3 as it appears on the left side of figure 1, this sinusoid extending over the entire length of the grid.
  • the slots are sized to prevent returns from flame and peeling or blowing. Lag thus introduced between the slots, relative to a conventional alignment, increases the length of the front flame, since this corresponds to the sinusoid of slots.
  • This developed perimeter can reach, or even exceed three times the length of the flame front by one traditional grid which makes it possible to obtain a rate high primary air. Similarly, the area covered by the flame is seriously increased, up to six times. Through against the thickness of the flame is reduced by 70%.
  • the flame is thus "stretched" along a path sinusoidal having greater contact with the atmosphere surrounding which allows greater access to air secondary, promoting combustion as well as cooling.
  • the fact that the flame is shorter allows to place the burner closer to the heat exchanger heat which increases its yield and makes it possible to obtain a more compact device.
  • the products of hot combustion are cooled and vented over quickly. Also because there are more surfaces of contact between each slot and the metal part the temperature distribution and the burner cooling are better. So we have a bearable heating of the metal constituting the outputs of flame. Since there are fewer constraints thermomechanical, the service life of the burner is increased.
  • the slots 2 are of different length. There are slots having a length L and slots shorter of length l, the latter being centered on axis 3. the longer slots are grouped by pair, alternating with the short ones and they are shifted alternately on either side of the axis. The ends of the slots staggered along the axis form also a sinusoid, but less regular than that of the figure 1.
  • the burner arm made with an outlet grid flame of this type consists of a shaped shell classic whose dimensions have been optimized for obtain a primary aeration rate close to stoichiometry and uniform distribution of the mixture air / gas outlet. At maximum power, the flames obtained have the main characteristic of being arranged in "lace" and thus offer the maximum of contact surface with surrounding air.

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  • 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. Flammstreifen für atmosphärischen und vormischenden Gasbrenner, ein Blechgitter umfassend, durchbohrt von einer Folge von rechtwinkligen Schlitzen, wobei die genannten Schlitze (2) beiderseits der Längsachse (3) des Gitters verteilt sind,
    dadurch gekennzeichnet, dass diese Schlitze eine Sinuslinie beiderseits der Längsachse (3) bilden und sich über die gesamte Länge des Gitters erstrecken, was die Länge der Flammenfront vergrößert.
  2. Flammstreifen nach Anspruch 1, dadurch gekennzeichnet, dass die Schlitze in der Richtung der Achse (3) durch eine konstante Distanz e voneinander beabstandet sind.
  3. Flammstreifen nach Anspruch 1, dadurch gekennzeichnet, dass die Schlitze (2) identisch sind, wobei jeder versetzt ist in Bezug auf seinen unmittelbaren Nachbarn.
  4. Plammstreifen nach Anspruch 1, dadurch gekennzeichnet, dass die Schlitze (2) unterschiedlich lang sind, wobei lange Schlitze L in Bezug auf die Achse (3) versetzt sind, und kurze Schlitze / auf die Achse (3) zentriert sind.
  5. Flammstreifen nach Anspruch 4, dadurch gekennzeichnet, dass die längeren Schlitze (2) paarweise versetzt sind in Bezug auf die Achse (3).
  6. Flammstreifen nach Anspruch 1, dadurch gekennzeichnet, dass die Schlitze (2) unterschiedlich lang sind und die meisten versetzt sind in Bezug auf die Achse (3).
EP99401012A 1998-04-28 1999-04-26 Flammstreifen für atmospherischen und vormischenden Brenner Expired - Lifetime EP0953804B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9805295 1998-04-28
FR9805295A FR2777978B1 (fr) 1998-04-28 1998-04-28 Rampe de sortie de flammes pour bruleur a gaz atmospherique et a premelange

Publications (2)

Publication Number Publication Date
EP0953804A1 EP0953804A1 (de) 1999-11-03
EP0953804B1 true EP0953804B1 (de) 2003-06-04

Family

ID=9525740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99401012A Expired - Lifetime EP0953804B1 (de) 1998-04-28 1999-04-26 Flammstreifen für atmospherischen und vormischenden Brenner

Country Status (6)

Country Link
US (1) US6123543A (de)
EP (1) EP0953804B1 (de)
JP (1) JPH11337017A (de)
AT (1) ATE242457T1 (de)
DE (1) DE69908486D1 (de)
FR (1) FR2777978B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10053877B4 (de) * 2000-10-31 2004-10-07 Robert Bosch Gmbh Brennerplatte für einen Gasbrenner
DE102022212226A1 (de) * 2022-11-17 2024-05-23 Robert Bosch Gesellschaft mit beschränkter Haftung Brenner

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2644515A (en) * 1947-12-22 1953-07-07 Rheem Mfg Co Gas burner head with secondary air feed grooves
GB1255602A (en) * 1967-09-30 1971-12-01 Sutherland Ltd Ag Gas burners
DE1816948A1 (de) * 1968-12-24 1970-06-25 Vaillant Joh Kg Bunsenbrenner
US3780954A (en) * 1970-05-15 1973-12-25 Robertshaw Controls Co Burner construction
DE2132968A1 (de) * 1970-07-04 1972-01-13 Guiseppe Fogliani Gasbrenner
GB1414979A (en) * 1972-12-07 1975-11-26 Robinson D H Gas burners
NL7508679A (nl) * 1975-07-21 1977-01-25 Remeha Fabrieken Bv Atmosferische gasbrander.
GB1473959A (en) * 1975-08-14 1977-05-18 Aeromatic Co Ltd Natural gas burners
DE2629988A1 (de) * 1976-07-03 1978-01-05 Haller Meurer Werke Ag Kastenfoermiges brennerrohr fuer allgasbrenner von gasheizgeraeten
DE2966549D1 (en) * 1978-07-28 1984-02-23 Aldo Polidoro Atmospheric gas burner with groups of vents for the passage of the mixture of combustible gas and combustion air
US5215457A (en) * 1990-01-24 1993-06-01 Worgas Bruciatori S.R.L. Combustion process and gas burner with low nox, co emissions
AT399552B (de) * 1991-02-22 1995-06-26 Vaillant Gmbh Brenner
DE19541801A1 (de) * 1995-11-09 1997-05-15 Bosch Gmbh Robert Brenner

Also Published As

Publication number Publication date
FR2777978B1 (fr) 2000-06-16
JPH11337017A (ja) 1999-12-10
FR2777978A1 (fr) 1999-10-29
US6123543A (en) 2000-09-26
DE69908486D1 (de) 2003-07-10
EP0953804A1 (de) 1999-11-03
ATE242457T1 (de) 2003-06-15

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