EP1616128B1 - Brenner mit einer metallmembran - Google Patents

Brenner mit einer metallmembran Download PDF

Info

Publication number
EP1616128B1
EP1616128B1 EP04714333.4A EP04714333A EP1616128B1 EP 1616128 B1 EP1616128 B1 EP 1616128B1 EP 04714333 A EP04714333 A EP 04714333A EP 1616128 B1 EP1616128 B1 EP 1616128B1
Authority
EP
European Patent Office
Prior art keywords
burner
section
base
membrane
gas burner
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
EP04714333.4A
Other languages
English (en)
French (fr)
Other versions
EP1616128A1 (de
Inventor
Dinand Lamberts
Alfred Van Goor
Geert Folkers
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.)
Bekaert NV SA
Bekaert Combustion Technology NV
Original Assignee
Bekaert NV SA
Bekaert Combustion Technology NV
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 Bekaert NV SA, Bekaert Combustion Technology NV filed Critical Bekaert NV SA
Priority to EP04714333.4A priority Critical patent/EP1616128B1/de
Publication of EP1616128A1 publication Critical patent/EP1616128A1/de
Application granted granted Critical
Publication of EP1616128B1 publication Critical patent/EP1616128B1/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
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/101—Flame diffusing means characterised by surface shape
    • F23D2203/1017—Flame diffusing means characterised by surface shape curved
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/20—Burner material specifications metallic
    • F23D2212/201—Fibres

Definitions

  • the present invention relates to a gas burner comprising a metal burner membrane.
  • the first drawback of these burners is that for a given dimension, they do not allow for a large range in output power: at low power, i.e. if the gasflow is low, there is a risk for flame extinguishment, and at high powers, i.e. if the gasflow is high, there is a risk that the flame blows off.
  • a third drawback of these burners is that different parts have to be punched, formed and welded together which leads to expensive burners.
  • the gas burner according the present invention is decribed in Claim 1.
  • the gas burner comprises a metal burner membrane. Geometrically this burner membrane comprises a base section and a closing section.
  • the base section has a smallest radius of curvature R base . What is meant with “smallest radius of curvature” will be explained further on.
  • the base section is connected uninterruptedly to the closing section through a transition region: the transition region burner membrane comprises the same elements as the base and closing section.
  • the transition region has a smallest radius of curvature r transition being larger than zero and being smaller or equal to R base .: 0 ⁇ r transition ⁇ R base .
  • the claimed range is : 0.02 x R base ⁇ r transition ⁇ 0.35 ⁇ R base
  • the invention relates to the embodiment of this geometrical construction, which of course is subject to engineering tolerances.
  • the invention is not delimited to the abstract geometrical shape as such but to the shape of the actual burner membrane. This shape can be easily measured by means of an appropriate computerised 3-D measuring bench that allows for immediate determination of the geometrical features in general and the radii of curvature in particular.
  • the shape of the burner membrane influences the functioning of the burner in the following way: those regions of the burner membrane that have a smaller radius of curvature yield a lower gas speed outside the membrane compared to the regions with a higher radius of curvature. A lower gas speed leads to a lower flame front. So the speed of the gas outside the membrane, and subsequently the flame front, can be advantageously modulated over the surface by changing the radius of curvature.
  • the transition from base section to closing section is realised without interruption.
  • uninterrupted is meant that the membrane forming the different sections (base, transition and closing) are not connected by any means that would lead to a seam of the membrane with a blocked gas flow at the burner surface as a result.
  • the three sections: base, transition and closing must be gas permeable.
  • the fact that the burner membrane is free of interruption ensures a closed flame front throughout the whole burner membrane.
  • FIG. 1 The basic geometrical features of the invention are illustrated in Figure 1 where a shape 100 of a burner membrane is depicted consisting out of a base section 102, a transition section 104 and a top section 106.
  • 'a' has its normal N to the surface.
  • the osculating circle C touches T1 in 'a'. If will be clear that of all planes containing N, the plane P1 determines the trajectory T1 with the smallest radius of curvature R(a) at 'a'.
  • the smallest value of all R(x)'s can be chosen.
  • a smallest radius of curvature 'R base ' is obtained.
  • a smallest radius of curvature 'r transition ' can be found for the transition region. It is essential to the invention that the smallest radius of curvature of the transition region is smaller or equal than the smallest radius of curvature of the base section.
  • Figure 2 depicts a first preferred embodiment 200 in perspective view.
  • the base section 201 is frustoconical in shape and reaches its minimum radius of curvature on the circle 204.
  • the transition region 202 is a surface section of a torus and the closing section 203 is a flat disc.
  • Figure 3 (a) shows the geometrical elements of the first preferred embodiment of Figure 2 according the line AA'. Only the outer surface of the surface membrane is depicted in order to bring forward the geometrical elements.
  • the frustoconical base section 201 has its smallest radius of curvature at the smaller diameter side.
  • the half top angle of the cone 326 was about 30° although 0° (a cylindrical base section) turned out to work just as well (embodiment not shown). Higher top angles are also not excluded. All points on the circle 204 share the same minimum radius of curvature R base 328.
  • the sphere 320 with radius R base defines the largest 'smallest radius of curvature' the transition region may have according the invention but falls outside the scope of the claims.
  • the transition region is part of the surface of a torus formed by a circle 324 that is rotated around the symmetry axis 340.
  • the radius of circle 324 determines the radius of the transition region 'r transition ' 330.
  • Part of a torus surface between the plane of circle 204 and a plane parallel to the latter is taken as the transition region.
  • the torus can also be constructed by rotating an ellipse or an oval or any other rounded figure around the axis of symmetry 340.
  • the torus is degenerate i.e. when there is no hole in the middle, is not excluded. This is e.g. the case in Figure 3a .
  • the closing section 203 is a flat disc in this embodiment. In another preferred embodiment of this invention (no figure provided) the closing section is a small inverted sphere cap thus entailing a depression at the centre of the burner membrane.
  • crossover from base section to transition region need not be smooth (with 'smooth' is meant continuous first order derivatives) but must be uninterrupted (zero order continuity).
  • Figure 3b depicts the physical features of the first preferred embodiment along the cut according plane AA' indicated in Figure 2 .
  • 201' indicates the stamped foraminated metal plate made out of a single piece of metal plate.
  • the foraminated metal plate is provided with a number of holes. As the hole size is relatively large (1 mm for this embodiment), the change in hole size at the transition region due to the deformation of the plate is not relevant to the flow speed of the gas.
  • a piece of knitted metal fibre fabric 305 is tensioned over the base section, the transition section and the closing section.
  • the fabric was attached to the foraminated plate by means of spot welding although other means of fastening are equally well possible for example - without being exhaustive - by sewing or by stapling.
  • the fabric was kept on the foraminated plate by means of a clamping ring that was spot welded to the plate.
  • Knitted metal fibre fabric allows for a high elongation thus leading to a continuous transition from the base section to the closing section.
  • the arrows 307, 308 and 309 indicate the velocity of the gas as it flows out of the membrane.
  • the lower gas velocity in the transition region 202 is represented with a shorter vector 308, while the gas velocity at the base section 201 and the closing section 203 is higher which is represented by a longer vector 309 resp. 307.
  • the lower flame front 310 - where the gas ignites - and the outer flame front 313 - where the top of the flame is - is indicated for each of the sections.
  • Figure 4 a preferred embodiment is illustrated that is more suited for replacement of a rectangular type burner.
  • the cross-section of the base section is essentially rectangular of which the edges are rounded.
  • Figure 4b is a cross-section along plane AA' of Figure 4a : the base section 401 smoothly goes over into the transition region 402 which approximates the upper half of an ellipse with a minor half axis indicated by 406 and a major half axis indicated by 405.
  • 407 indicates the osculating circle associated with the smallest radius of curvature of the transition region.
  • Figure 4c shows a cut along the line BB'.
  • Figure 4c shows an essentially identical shape as the AA' cut, but here the half ellipse has been cut in two, and the two quarter pieces have been displaced the appropriate distance.
  • Figure 4d shows the closing view of a horizontal cut. The rounded corners have essentially merged into a semicircle with a radius equal to the half major axis of the ellipse as described in Figure 4b . Note that in this embodiment, the closing section has vanished into a single line 408.
  • the foraminated plate 201' of Figure 3b was replaced by a stainless steel wire mesh 520.
  • the diameter of the wires was 0.48mm, with a square 24/24 mesh size (24 wires per inch) in a 2/2 twilled weave.
  • the minimum radius of curvature 506 in the transition region 502 was equal to 4 mm although a radius from 2 to 8 mm works equally well.
  • the value of the minimum radius of curvature 508 of the base section 501 was 25 mm and is preferably in the range of 30 to 45 mm.
  • the closing section is a flat disc 504.
  • a knitted metal fibre fabric 512 was spot welded to the wire mesh.
  • FIG. 5(c) An alternative to the third embodiment is depicted in Figure 5(c) .
  • Like parts of the burner membrane according the third embodiment are identified with primed numbers.
  • the transition region 502' is in the form of a circular ridge.
  • the top of the ridge has a radius of curvature 506', which turns out to be the smallest radius of curvature of the transition region.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Feeding And Controlling Fuel (AREA)

Claims (9)

  1. Gasbrenner (200), wobei der Brenner eine Metall-Brennermembran umfasst, wobei die Membran einen Basisabschnitt (201, 401, 501), der einen kleinsten Krümmungsradius aufweist, der RBasis ist, und einen Endabschnitt (203, 408, 504) umfasst, wobei die Membran unterbrechungsfrei ist und einen Übergangsabschnitt (202, 402, 502, 502') zum Verbinden des Basisabschnitts mit dem Endabschnitt aufweist, wobei der Übergangsabschnitt einen kleinsten Krümmungsradius rÜbergang aufweist, der größer oder gleich 0,02 x RBasis und kleiner oder gleich 0,35 x RBasis ist und wobei die Brennermembran ein Gewebe (305, 512) aus geflochtenen oder gewirkten oder gewebten Fasern aus rostfreiem Stahl umfasst, wobei die Brennermembran eine tiefgezogene oder geprägte Platte, in die Löcher gebohrt sind (201'), oder ein tiefgezogenes oder geprägtes Drahtnetz (520) umfasst;
    wobei das Gewebe über die tiefgezogene oder geprägte Platte, in die Löcher gebohrt sind, gezogen ist oder wobei das Gewebe von dem tiefgezogenen oder geprägten Drahtnetz getragen wird;
    und wobei die Brennermembran kleine Schweißnähte umfasst.
  2. Gasbrenner gemäß Anspruch 1, wobei die Fasern aus rostfreiem Stahl im Wesentlichen parallel zu Bündeln angeordnet sind.
  3. Gasbrenner gemäß Anspruch 1 oder 2, wobei das Drahtnetz durch Verflechten oder Verwirken oder Verweben in das Gewebe aus rostfreien Fasern integriert ist.
  4. Gasbrenner gemäß einem der Ansprüche 1 bis 3, wobei der Basisabschnitt eine Kegelstumpfform aufweist.
  5. Gasbrenner gemäß einem der Ansprüche 1 bis 3, wobei der Basisabschnitt eine zylindrische Form aufweist.
  6. Gasbrenner gemäß Anspruch 4 oder 5, wobei der Übergangsbereich Teil einer Torusoberfläche ist, die von zwei Ebenen begrenzt wird, die senkrecht auf die Symmetrieachse des Torus stehen.
  7. Gasbrenner gemäß einem der Ansprüche 1 bis 3, wobei der Basisabschnitt einen polygonalen Querschnitt aufweist, wobei die Ecken des Querschnitts abgerundet sind.
  8. Gasbrenner gemäß einem der Ansprüche 1 bis 3, wobei der Basisabschnitt einen rechteckigen Querschnitt aufweist, wobei die Ecken des Querschnitts abgerundet sind.
  9. Gasbrenner gemäß einem der Ansprüche 1 bis 3, wobei der Basisabschnitt ein Pyramidenstumpf ist, wobei die Pyramide abgerundete Kanten aufweist.
EP04714333.4A 2003-04-18 2004-02-25 Brenner mit einer metallmembran Expired - Lifetime EP1616128B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04714333.4A EP1616128B1 (de) 2003-04-18 2004-02-25 Brenner mit einer metallmembran

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP03101079 2003-04-18
EP04714333.4A EP1616128B1 (de) 2003-04-18 2004-02-25 Brenner mit einer metallmembran
PCT/EP2004/050205 WO2004092647A1 (en) 2003-04-18 2004-02-25 A metal burner membrane

Publications (2)

Publication Number Publication Date
EP1616128A1 EP1616128A1 (de) 2006-01-18
EP1616128B1 true EP1616128B1 (de) 2016-05-04

Family

ID=33185953

Family Applications (1)

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EP04714333.4A Expired - Lifetime EP1616128B1 (de) 2003-04-18 2004-02-25 Brenner mit einer metallmembran

Country Status (5)

Country Link
US (2) US20060251998A1 (de)
EP (1) EP1616128B1 (de)
KR (2) KR20110104080A (de)
CN (2) CN100557310C (de)
WO (1) WO2004092647A1 (de)

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EP2914903B1 (de) * 2012-10-31 2018-03-21 Bekaert Combustion Technology B.V. Gasvormischbrenner
WO2014116970A2 (en) 2013-01-25 2014-07-31 Beckett Gas, Inc. Ultra-low nox burner
EP2789911B1 (de) 2013-04-09 2016-07-20 Bekaert Combustion Technology B.V. Gasvormischbrenner
WO2015000869A1 (en) 2013-07-02 2015-01-08 Bekaert Combustion Technology B.V. Gas premix burner
EP3017099B1 (de) 2013-07-02 2019-05-22 Bekaert Combustion Technology B.V. Gasvormischbrenner
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US20200200437A1 (en) * 2017-07-13 2020-06-25 Bekaert Combustion Technology B.V. Premix gas burner
US11236903B2 (en) 2018-02-23 2022-02-01 Fulton Group N.A., Inc. Compact inward-firing premix fuel combustion system, and fluid heating system and packaged burner system including the same
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EP3755946A1 (de) * 2018-02-23 2020-12-30 Fulton Group N.A., Inc. Vorgemischkraftstoffbrenner mit einwärtsbefeuerung
WO2019207559A2 (en) * 2018-04-13 2019-10-31 Fulton Group N.A., Inc. Compact dual-fuel combustion system, and fluid heating system and packaged burner system including the same
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WO2021140036A1 (en) 2020-01-08 2021-07-15 Bekaert Combustion Technology B.V. Gas burner and heating appliance
NL2024623B1 (en) 2020-01-08 2021-09-07 Bekaert Combustion Tech Bv Gas burner and heating appliance
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Also Published As

Publication number Publication date
US20110081621A1 (en) 2011-04-07
EP1616128A1 (de) 2006-01-18
KR20050122273A (ko) 2005-12-28
CN100557310C (zh) 2009-11-04
CN1777775A (zh) 2006-05-24
KR20110104080A (ko) 2011-09-21
CN101545634A (zh) 2009-09-30
CN101545634B (zh) 2012-04-04
US20060251998A1 (en) 2006-11-09
WO2004092647A1 (en) 2004-10-28

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