EP0451923B1 - Burner - Google Patents

Burner Download PDF

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Publication number
EP0451923B1
EP0451923B1 EP91200856A EP91200856A EP0451923B1 EP 0451923 B1 EP0451923 B1 EP 0451923B1 EP 91200856 A EP91200856 A EP 91200856A EP 91200856 A EP91200856 A EP 91200856A EP 0451923 B1 EP0451923 B1 EP 0451923B1
Authority
EP
European Patent Office
Prior art keywords
burner
mixture
discharge
discharge openings
supply conduit
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.)
Revoked
Application number
EP91200856A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0451923A2 (en
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(B1) "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/en
Publication of EP0451923A3 publication Critical patent/EP0451923A3/en
Application granted granted Critical
Publication of EP0451923B1 publication Critical patent/EP0451923B1/en
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 conduit for supplying a mixture of combustible gas and air; and at least one mixture chamber, having at least one inflow opening connected with the mixture supply conduit, the cross-section of which opening is of the same order as that of the mixture supply conduit, and at a plurality of discharge openings, which discharge into the space surrounding the burner, and the diameter of which is small relative to the diameter of the mixture supply conduit; and flame stabilizing means arranged near the discharge opening.
  • Such a burner is known from DE-A-2035563.
  • This known burner comprises an annular main mixture chamber located at the end of the mixture supply conduit, and having radially spaced main discharge openings arranged in the sidewall of the mixture chamber.
  • the burner is further provided with flame stabilizing means, which comprise an annular auxiliary mixture chamber arranged concentriccally around the mixture supply conduit, and in communication therewith through radially spaced openings.
  • the auxiliary mixture chamber is further in communication with the space surrounding the burner through a plurality of radially spaced auxiliary discharge openings, which are arranged adjacent the main discharge openings.
  • part of the mixture supplied by the supply conduit is led through the auxiliary mixture chamber and the auxiliary discharge openings, while the greater part of the mixture to be burnt is led through the main mixture chamber and main discharge openings.
  • the velocity at which the mixture is discharged from the auxiliary discharge openings is much lower than the discharge velocity from the main discharge openings.
  • the adjustability of a burner having flame stabilizing means over an extended range of loads is very advantageous when such burners are used in a heating installation. Because of the extended adjustability burners with flame stabilizing means do not have to be turned on and off frequently in order to maintain a temperature within a given range, as is necessary for burners without stabilizing means. A burner having flame stabilizing means therefore is more user friendly and less susceptible to wear. Furthermore, the emission of substances which are damaging to humans and to the environment every time the burner is turned on and off, is reduced with burners having flame stabilizing means.
  • the present invention seeks to provide a burner having flame stabilizing means as described in the preamble of claim 1, which is further improved vis-à-vis the known burner.
  • the mixture chamber has a plurality of discharge areas with the discharge openings arranged therein in a regular pattern
  • the flame stabilizing means have the shape of vortex strips mutually separating the discharge areas and forming zones of reduced flow velocities between the discharge areas, the width of the vortex strips being such at the distance between adjacent discharge areas is greater than the distance between adjacent discharge opening in said discharge areas.
  • a stable combustion which may also occur outside the burner, can be maintained over a wide range of loads.
  • the diameter of the discharge opening being small relative to the diameter of the 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 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. It should be noted that this burner does not contain all features of the independent claim, and therefore does not form part of the present invention.
  • 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 the ceramic burner as shown in fig. 1 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.
  • a ceramic burner comprising all features of the independent claim and therefore embodying the invention is shown in fig. 7 and uses flame stabilizing means in the form of so called vortex strips 14.
  • the mixture chamber 6 is covered on its upper side by a burner plate 15, in which a large number of discharge openings 7 is arranged.
  • the 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 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)
  • 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)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Glass Compositions (AREA)
  • Magnetic Heads (AREA)
EP91200856A 1990-04-12 1991-04-11 Burner Revoked EP0451923B1 (en)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=19856931

Family Applications (1)

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

Country Status (17)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0521568B1 (en) * 1991-07-05 1996-09-18 Tokyo Gas Co., Ltd. A low-nox gas burner
GB2302401B (en) * 1995-06-15 1999-08-04 British Gas Plc Fuel fired burners
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
CA2712497C (en) * 2008-01-28 2016-07-12 Tetra Laval Holdings & Finance Sa Gas burner
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

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL83206C (sh) * 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
GB1037045A (en) * 1963-09-13 1966-07-27 Geo Bray & Company Ltd Improvements in or relating to gas jets or burners
NL6609404A (sh) * 1966-07-05 1968-01-08
FR1545512A (fr) * 1966-12-05 1968-11-08 W App Nfabriek N V As Brûleur
DE2035563C3 (de) * 1970-07-17 1975-03-27 Walter 7000 Stuttgart Dreizler Brennerkopf für einen Vormischgasbrenner

Also Published As

Publication number Publication date
ES2064881T3 (es) 1995-02-01
FI911764A (fi) 1991-10-13
FI911764A0 (fi) 1991-04-11
SI9110667A (en) 1994-06-30
NL9000883A (nl) 1991-11-01
JPH04225709A (ja) 1992-08-14
HU911220D0 (en) 1991-10-28
DK0451923T3 (da) 1995-05-29
CS104091A2 (en) 1991-12-17
LTIP1567A (en) 1995-06-26
EP0451923A2 (en) 1991-10-16
DE69105588D1 (de) 1995-01-19
NO911413D0 (no) 1991-04-11
BG94249A (bg) 1993-12-24
EP0451923A3 (en) 1992-07-01
RU2042883C1 (ru) 1995-08-27
NO911413L (no) 1991-10-14
YU66791A (sh) 1994-12-28
DE69105588T2 (de) 1995-04-13
HUT60027A (en) 1992-07-28
PL165631B1 (pl) 1995-01-31
ATE115260T1 (de) 1994-12-15

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