EP0451923A2 - Brûleur - Google Patents

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Publication number
EP0451923A2
EP0451923A2 EP91200856A EP91200856A EP0451923A2 EP 0451923 A2 EP0451923 A2 EP 0451923A2 EP 91200856 A EP91200856 A EP 91200856A EP 91200856 A EP91200856 A EP 91200856A EP 0451923 A2 EP0451923 A2 EP 0451923A2
Authority
EP
European Patent Office
Prior art keywords
primary
mixture
supply conduit
burner
mixture supply
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
EP91200856A
Other languages
German (de)
English (en)
Other versions
EP0451923B1 (fr
EP0451923A3 (en
Inventor
Willem Meijer
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.)
Dru BV
Original Assignee
Dru BV
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19856931&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0451923(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Dru BV filed Critical Dru BV
Publication of EP0451923A2 publication Critical patent/EP0451923A2/fr
Publication of EP0451923A3 publication Critical patent/EP0451923A3/en
Application granted granted Critical
Publication of EP0451923B1 publication Critical patent/EP0451923B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
    • 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/06—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with radial outlets at the burner head
    • 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/10—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head
    • F23D14/105—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head with injector axis parallel to the burner head axis

Definitions

  • the invention relates to a burner comprising a primary conduit for supplying a mixture of combustible gas and air; and at least one primary mixture chamber, having at least one inflow opening connected with the primary mixture supply conduit, the diameter of which opening is of the same order as that of the primary mixture supply conduit, and at least one primary discharge opening, which discharges into the space surrounding the burner, and the diameter of which is small relative to the diameter of the primary mixture supply conduit.
  • the limited adjustability of the known burners is due to the fact that as burner power is increased by increasing mixture supply, at a certain point the velocity at which the mixture to be burnt discharges from the primary discharge openings exceeds its combustion velocity. Thereby, the flame is "blown away" as it were, and the burner extinguishes.
  • the present invention therefore has for its object to provide a burner having an improved adjustability vis-à-vis the burners described above, and in which a relatively low combustion temperature is maintained throughout the entire range of loads. This is accomplished according to the invention by flame stabilizing means arranged near the primary discharge opening.
  • a stable combustion which may also occur outside the burner, can be maintained over a large range of loads.
  • the diameter of the primary discharge opening being small relative to the diameter of the primary mixture supply conduit, at high loads a high flow velocity of the mixture to be burnt develops therein.
  • a fan shaped flame front having a large surface develops, whereby the combustion temperature is kept relatively low (in the order of 1000-1100°C), and the combustion thus clean.
  • the flame stabilizing means function to keep the combustion velocity in at least one point of the flame front substantially equal to the discharge velocity of the mixture to be burnt, whereby the flame "rests" in that point. This point stabilizes the combustion in the remainder of the flame front.
  • the primary mixture chamber has a plurality of discharge areas with primary discharge openings arranged therein in a regular pattern, and the flame stabilizing means have the shape of vortex strips mutually separating the discharge areas, a sturdy burner having an improved adjustability is provided in an easy manner.
  • the burner is made of a ceramic material.
  • Ceramic burners have a very clean combustion relative to conventional steel burners. Especially the emission of nitrogen oxide is strongly reduced when using a ceramic burner. This is due to the isolating action of the ceramic material, whereby a relatively low combustion temperature is maintained. The isolating action of the ceramic material further prevents the gas-air mixture in the supply line of the burner from being preheated. This is important, since with preheating dissociation of the mixture, and thence forming of nitrogen oxide already occurs in the supply line.
  • a ceramic burner 1 (fig. 1) comprises a primary mixture supply conduit 2, around which an annular secondary mixture chamber 3 is arranged in order to stabilize the flame of the burner 1, said chamber being connected with the primary mixture supply conduit 2 over circumferentially spaced, radial secondary mixture supply conduits 4.
  • the secondary mixture chamber 3 is connected to the space surrounding the burner over a secondary discharge opening 5.
  • the primary mixture supply conduit 2 discharges into a cylindrical primary mixture chamber 6, which is connected to the space surrounding the burner 1 over a plurality of circumferentially spaced, radial primary discharge openings 7.
  • the primary and secondary mixture chambers 6,3 are formed by two stackable, concentric annular elements 9,10. By stacking several of these elements 9,10 in the manner indicated in the figure, a burner having the required heating capacity may easily be assembled.
  • a gas-air mixture that is supplied through the primary mixture supply conduit 2 (fig. 2,3 and 4) divides over the secondary mixture chamber 3 (as indicated by the arrows S) and the primary mixture chamber 6 (indicated by the arrows P).
  • the flow velocity of the mixture is relatively low, and combustion of the primary mixture flow P takes place in the primary discharge openings 7.
  • the flame front 11 in this case is arc-shaped.
  • the ceramic burner functions as a source of heat radiation, since the ceramic material surrounding the primary discharge openings 7 glows.
  • the flow velocity of the mixture increases still further, and exceeds the combustion velocity of the mixture by such an amount, that the flame would be blown out.
  • the primary mixture flow P is preheated by the presence of the secondary mixture flow S flowing from the secondary mixture chamber 3, whereby the combustion velocity of the primary mixture flow P increases and in at least one point of the flame front becomes substantially equal to the discharge velocity thereof, so that a stable flame develops. Due to the high flow velocity of the primary mixture flow P in the primary discharge openings 7, the flame fronts 11 assume a fan shape.
  • the heating capacity of a ceramic burner according to the invention may be further increased by connecting several stacks of annular elements 9,10 with a common main supply conduit 12 (fig. 5).
  • the main supply conduit 12 is provided with a gas-air mixture by an injector 13, through which the gas G is spouted into the main supply conduit 12 with such high velocity, that air A is sucked in therewith.
  • the secondary mixture supply conduits 4 are each connected with a primary supply conduit 2, it may of course be envisaged to connect the secondary supply conduit 4 with a source of combustible mixture independent from the primary supply conduit 2.
  • a well burning stabilizing flame is ensured under all circumstances.
  • An alternative embodiment of the ceramic burner according to the invention uses flame stabilizing means in the form of so called vortex strips 14 (fig. 7).
  • the primary mixture chamber 6 is covered on its upper side by a burner plate 15, in which a large number of primary discharge openings 7 is arranged.
  • the primary discharge openings 7 are arranged in regular patterns in a number of separate discharge areas 16, which are separated by the vortex strips 14.
  • the vortex strips 14 form zones of reduced flow velocities between the discharge areas 16, in which the warm mixture swirls around, igniting the mixture that is discharging at a high velocity. Therefore, even at high burner loads (fig. 8) there are points in the flame front 11 where the combustion velocity is substantially equal to the discharge velocity of the mixture. Thus the flame "rests" on those points and the complete flame front is stabilized.
  • the optimum pattern of the vortex strips 14 on the burner plate 15 and the relationship between the widths of the vortex strips 14, the dimensions of the discharge areas 16 and the diameters of the separate discharge openings 7 may be easily determined by someone skilled in the art on the basis of his experience and insight. It is recommended to choose an irregular pattern for the vortex strips 14, in order to prevent as much as possible the occurence of resonances.
  • the primary mixture chamber 6 is rectangular. Possible variations in the flow velocity of the gas-air mixture due to this form hardly influence the performance of the burner 1, since the presence of the vortex strips 14 ensures the stability of the combustion over an extended range of loads, and thus over a large variety of mixture flow velocities.
  • the illustrated burner 1 is further provided with an aligning ring 17 arranged around the burner plate 15, for maintaining the burning mixture flow discharging along the edge of the plate 15 within the circumference of the burner plate 15.
  • an aligning ring 17 Under the inwardly extending part of the aligning ring 17 is arranged an outer row of discharge openings 7, from which the mixture flows against the aligning ring 17, again generating a vortex for stabilizing the flame.
  • a cord-shaped gasket 18 of ceramic material is provided between the aligning ring 17 and the burner plate 15 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Glass Compositions (AREA)
  • Magnetic Heads (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Organic Insulating Materials (AREA)
  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
EP91200856A 1990-04-12 1991-04-11 Brûleur Revoked EP0451923B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9000883A NL9000883A (nl) 1990-04-12 1990-04-12 Keramische brander.
NL9000883 1990-04-12

Publications (3)

Publication Number Publication Date
EP0451923A2 true EP0451923A2 (fr) 1991-10-16
EP0451923A3 EP0451923A3 (en) 1992-07-01
EP0451923B1 EP0451923B1 (fr) 1994-12-07

Family

ID=19856931

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91200856A Revoked EP0451923B1 (fr) 1990-04-12 1991-04-11 Brûleur

Country Status (17)

Country Link
EP (1) EP0451923B1 (fr)
JP (1) JPH04225709A (fr)
AT (1) ATE115260T1 (fr)
BG (1) BG94249A (fr)
CS (1) CS104091A2 (fr)
DE (1) DE69105588T2 (fr)
DK (1) DK0451923T3 (fr)
ES (1) ES2064881T3 (fr)
FI (1) FI911764A (fr)
HU (1) HUT60027A (fr)
LT (1) LTIP1567A (fr)
NL (1) NL9000883A (fr)
NO (1) NO911413L (fr)
PL (1) PL165631B1 (fr)
RU (1) RU2042883C1 (fr)
SI (1) SI9110667A (fr)
YU (1) YU66791A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5368476A (en) * 1991-07-05 1994-11-29 Tokyo Gas Company Ltd. Low-NOx gas burner
EP0751344A1 (fr) * 1995-06-15 1997-01-02 British Gas plc Brûleur opérant au combustible
EP0774623A1 (fr) * 1995-11-17 1997-05-21 Dejatech B.V. Brûleur à surface de sortie segmentée
AT405444B (de) * 1996-01-30 1999-08-25 Vaillant Gmbh Heizeinrichtung mit einem im wesentlichen zylinderförmigen brenner

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0906568A2 (pt) * 2008-01-28 2015-07-07 Tetra Laval Holdings & Finance Queimador de gás
CN103162292B (zh) * 2013-02-26 2015-06-03 宁波方太厨具有限公司 一种燃烧器外火盖

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL83206C (fr) * 1900-01-01
GB735519A (en) * 1951-05-30 1955-08-24 Bataafsche Petroleum Apparatus for stabilising the flames of gas burners
FR1319406A (fr) * 1962-01-18 1963-03-01 Usines Du Pied Selle Soc D Perfectionnements apportés aux brûleurs destinés aux fours-grilloirs de cuisinières à gaz
FR1327885A (fr) * 1962-04-12 1963-05-24 Brûleur à flamme pilote
NL6609404A (fr) * 1966-07-05 1968-01-08
FR1545512A (fr) * 1966-12-05 1968-11-08 W App Nfabriek N V As Brûleur
DE1429133B1 (de) * 1963-09-13 1970-09-24 Bray & Co Ltd Geo Gasbrennerduese
DE2035563A1 (de) * 1970-07-17 1972-01-20 Dreizler W Gasbrennerkopf mit atmosphärischer Gasluftvormischung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL83206C (fr) * 1900-01-01
GB735519A (en) * 1951-05-30 1955-08-24 Bataafsche Petroleum Apparatus for stabilising the flames of gas burners
FR1319406A (fr) * 1962-01-18 1963-03-01 Usines Du Pied Selle Soc D Perfectionnements apportés aux brûleurs destinés aux fours-grilloirs de cuisinières à gaz
FR1327885A (fr) * 1962-04-12 1963-05-24 Brûleur à flamme pilote
DE1429133B1 (de) * 1963-09-13 1970-09-24 Bray & Co Ltd Geo Gasbrennerduese
NL6609404A (fr) * 1966-07-05 1968-01-08
FR1545512A (fr) * 1966-12-05 1968-11-08 W App Nfabriek N V As Brûleur
DE2035563A1 (de) * 1970-07-17 1972-01-20 Dreizler W Gasbrennerkopf mit atmosphärischer Gasluftvormischung

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5368476A (en) * 1991-07-05 1994-11-29 Tokyo Gas Company Ltd. Low-NOx gas burner
EP0751344A1 (fr) * 1995-06-15 1997-01-02 British Gas plc Brûleur opérant au combustible
GB2302401B (en) * 1995-06-15 1999-08-04 British Gas Plc Fuel fired burners
US5993200A (en) * 1995-06-15 1999-11-30 British Gas Plc. Fuel fired burners
EP0774623A1 (fr) * 1995-11-17 1997-05-21 Dejatech B.V. Brûleur à surface de sortie segmentée
NL1001688C2 (nl) * 1995-11-17 1997-05-21 Furigas Assen Bv Brander met gesegmenteerd branderdek.
AT405444B (de) * 1996-01-30 1999-08-25 Vaillant Gmbh Heizeinrichtung mit einem im wesentlichen zylinderförmigen brenner

Also Published As

Publication number Publication date
JPH04225709A (ja) 1992-08-14
BG94249A (bg) 1993-12-24
DE69105588D1 (de) 1995-01-19
SI9110667A (en) 1994-06-30
EP0451923B1 (fr) 1994-12-07
RU2042883C1 (ru) 1995-08-27
EP0451923A3 (en) 1992-07-01
NL9000883A (nl) 1991-11-01
YU66791A (sh) 1994-12-28
HU911220D0 (en) 1991-10-28
NO911413D0 (no) 1991-04-11
LTIP1567A (en) 1995-06-26
FI911764A (fi) 1991-10-13
NO911413L (no) 1991-10-14
DK0451923T3 (da) 1995-05-29
PL165631B1 (pl) 1995-01-31
DE69105588T2 (de) 1995-04-13
ES2064881T3 (es) 1995-02-01
CS104091A2 (en) 1991-12-17
ATE115260T1 (de) 1994-12-15
HUT60027A (en) 1992-07-28
FI911764A0 (fi) 1991-04-11

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