WO2012076600A1 - Brûleur doté d'une platine de brûleur fixée localement - Google Patents

Brûleur doté d'une platine de brûleur fixée localement Download PDF

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Publication number
WO2012076600A1
WO2012076600A1 PCT/EP2011/072073 EP2011072073W WO2012076600A1 WO 2012076600 A1 WO2012076600 A1 WO 2012076600A1 EP 2011072073 W EP2011072073 W EP 2011072073W WO 2012076600 A1 WO2012076600 A1 WO 2012076600A1
Authority
WO
WIPO (PCT)
Prior art keywords
burner
deck
burner deck
ionization probe
perforated plate
Prior art date
Application number
PCT/EP2011/072073
Other languages
English (en)
Inventor
Dirk Ten Hoeve
Toby Kuipers
Original Assignee
Bekaert Combustion Technology B.V.
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 Combustion Technology B.V. filed Critical Bekaert Combustion Technology B.V.
Priority to EP11802880.2A priority Critical patent/EP2649372B1/fr
Publication of WO2012076600A1 publication Critical patent/WO2012076600A1/fr

Links

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
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/74—Preventing flame lift-off

Definitions

  • the present invention relates to a burner with a fiber based burner deck
  • the invention further relates to a burner control system with more stable flame controllability over time.
  • an ionization signal which is obtained via an ionization electrode (ionization probe, ionization rod), is used in electronics to measure the presence of the flame and thereby also obtaining a measure for the air-gas ratio lambda.
  • Some methods aim at keeping the air-gas ratio constant, thereby obtaining clean combustion throughout the whole combustion range and/or with differing compositions of the combustion gas and/or with different composition and temperature of the combustion air.
  • An ionization system is generally comprising an electrode (or more than one electrode) and an earth, wherein a voltage is applied over the electrode and the earth. In some systems a further electrode might be the earth, in other systems the burner serves as earth.
  • DE 196 32 983 discloses a measuring device for a flame and an
  • a lambda reference value for low emissions is set by means of an ionization electrode.
  • EP1 154203 also uses a signal obtained by an ionization electrode which is located in the burner flame area as in DE 196 32 983, but further improvements to the digitizing process are found.
  • EP1036984 discloses the use of an ionization electrode in a premix burner wherein the premix burner has locally an increased surface area of the mixture flow passages in order to obtain a representative linear signal throughout the whole working range of the premix burner. This increased surface area of the mixture flow passages is in the direct proximity of the ionization electrode.
  • WO2010/094673 A1 discloses a premix gas burner having a burner
  • the surface which exhibits a plurality of flow passages and at least two ionization electrodes connected to a measuring device and preferably also to a control device.
  • the ionization electrodes are arranged at different distances from the burner surface and the ionization electrodes are arranged electronically in parallel and electric currents are measured over each ionization electrode and the burner surface, the burner thus serving as earth in the electrical circuit.
  • Burners with fiber based burner decks are known in the state of the art.
  • the fiber based burner deck is fixed to the supporting frame, plate or screen structure at the edges of the fiber based burner deck.
  • a common disadvantage of burners with fiber based burner deck is that over time or during use instability can exist in the combustion control.
  • the object of the present invention is to provide a burner with a burner deck made out of fiber based material and with improved burner control possibilities. It is a further object of the present invention to provide a burner control system which permits to control the air gas ratio of a burner in a stable way over the complete duration of a combustion process and over the life of the burner.
  • An aspect of the invention provides a burner comprising a fiber based burner deck, a perforated plate or a screen supporting the fiber based burner deck, and at least one ionization probe mounted at the burner side of the burner deck. A distance is defined between the ionization probe and the burner deck. Near the ionization probe, the burner deck is partially fixed to the perforated plate or the screen supporting the fiber based burner deck, so that the distance between the ionization probe and the burner deck remains constant during burning.
  • the burner can have any shape as is known in the art.
  • One aspect of the invention relates to a burner with a burner deck having a curved surface.
  • Another aspect of the invention relates to a burner with a cylindrical shape (also called a cylindrical burner).
  • Yet another aspect of the invention relates to a burner with a conical.
  • the partial fixation of the burner deck near the ionization probe is present within a specific area of the burner deck.
  • This specific area of the burner deck is defined by the area around the vertical projection of the ionization probe onto the burner deck.
  • the specific area is defined by a distance of 35 mm around the vertical projection of the ionization probe onto the burner deck.
  • the specific area is defined by a distance of 25 mm around the vertical projection of the ionization probe onto the burner deck.
  • the specific area is defined by a distance of 20 mm around the vertical projection of the ionization probe onto the burner deck.
  • the burner deck can be a knitted fabric, a woven fabric or a nonwoven fabric.
  • the burner deck can also be made out of sintered fibrous material.
  • the fixation of the burner deck near the ionization probe can be via
  • the fixation of the burner deck near the ionization probe can be via a combination of techniques resulting in partial fixation of the burner deck near the ionization probe.
  • fixations that fix the fiber based burner deck to the perforated plate or the screen near the ionization probe are 1 - 6 mm wide, preferably 2 - 4 mm wide.
  • the burner can be a premix gas burner.
  • Another aspect of the invention is a burner control system using a burner deck and ionization probe as described in the invention.
  • the measured current of the ionization probe is used to control the air-gas ratio lambda of the burner, thereby steering the combustion and guaranteeing proof of combustion in the way as set by the control parameters.
  • Another aspect of the invention is a heating apparatus comprising a burner as described in the invention.
  • Another aspect of the invention is a heating apparatus comprising a
  • Another aspect of the invention is the use of a burner as described in the invention.
  • One benefit of the invention is that it prevents the burner deck from
  • Another benefit of the fixation as described in the invention is that a better ground connection of the burner deck is realized, with enhanced ionization signal as a result.
  • Yet another benefit of the invention is that, at the positions where the burner deck is connected to the perforated plate or the screen, better flame stability is observed, resulting in a better ionization signal over a wider power range.
  • Figure 1 shows a schematic representation of a burner with a textile based burner deck with a curved surface and with the fixation of part of the burner deck near the ionization probe according to the invention.
  • Figure 2 shows a schematic drawing of the cross section along line ⁇ - ⁇ of figure 1 .
  • Figure 3 shows a schematic drawing of an alternative way of fixation of the burner deck to the perforated plate or the screen.
  • Figure 4 shows a schematic drawing of yet an alternative way of fixation of the burner deck to the perforated plate or the screen.
  • Figure 5 shows a schematic drawing of yet an alternative way of fixation of the burner deck to the perforated plate or the screen.
  • Figure 6 shows a schematic drawing of yet an alternative way of fixation of the burner deck to the perforated plate or the screen.
  • Figure 7 shows a schematic drawing of yet an alternative way of fixation of the burner deck to the perforated plate or the screen.
  • Figure 8 shows a schematic drawing of a cylindrical burner according to the invention.
  • Figure 9 shows a burner and burner control system according to the invention.
  • a burner 10 in figure 1 comprises an
  • FIG. 1 shows a cross section of figure 1 along line ⁇ - ⁇ .
  • the fiber based burner deck 20 is supported by a perforated plate or a screen 22.
  • the fiber based burner deck 20 and the perforated plate or the screen 22 are fixed to frame 24 of the burner. Via fixation points 26, the fiber based burner deck 20 is fixed to the perforated plate or the screen 22 near the ionization probe 28.
  • Figure 3 shows another arrangement for the fixation near the ionization probe of the fiber based burner deck to the perforated plate or screen.
  • the fiber based burner deck 30 is fixed via a linear connection 32 to the underlying perforated plate or screen 34.
  • Figure 4 shows yet another arrangement for the fixation near the
  • the fiber based burner deck 40 is fixed via a dotted line connections 42 to the underlying perforated plate or the screen 44.
  • Figure 5 shows yet another arrangement for the fixation near the
  • the fiber based burner deck 50 is fixed via point fixations 52 on parallel lines to the underlying perforated plate or the screen 54, near the ionization probe 56.
  • Figure 6 shows yet another arrangement for the fixation near the
  • the fiber based burner deck 60 is fixed via dotted fixations 62 on diagonal lines to the underlying perforated plate or the screen 64, near the ionization probe 66.
  • Figure 7 shows yet another arrangement for the fixation near the
  • the fiber based burner deck 70 is fixed via parallel line fixations 72 to the underlying perforated plate or the screen 74.
  • the parallel line fixations 72 are perpendicular to the ionization probe 76.
  • fixation or fixations near the ionization probe of the fiber based burner deck to the perforated plate or the screen are in the form of dashed lines.
  • fixation or fixations comprise crosses.
  • fixation or fixations comprise combinations of fixations that can include (but are not limited to) lines, dots, dashes or crosses.
  • the ionization probe of the fiber based burner deck to the perforated plate or the screen are in line patterns.
  • the line pattern can comprise straight lines or curved lines.
  • the fixations are in a two dimensionally patterned way.
  • FIG. 8 shows a schematic drawing of a cylindrical burner 800 according to the invention.
  • the burner has a gas inlet port 805, supplying the gas-air premix into the cylindrical burner 800.
  • a fibre based burner deck 810 - originally in rectangular shape - has been bent around an internal cylindrical perforated plate or screen structure (not shown on the drawing) to follow the cylindrical structure of the latter.
  • the fibre based burner deck is fixed to the internal cylindrical perforated plate or screen structure. This fixation can be over the full length of the edges of the fibre based burner deck or over only part of the edges.
  • An ionization probe 850 is positioned at the combustion side of the burner. Near ionization probe 850, fixations 860 are fixing the fiber based burner deck to the perforated plate or the screen.
  • an end cap is present at the top side 870 of the
  • an additional fiber based burner deck can be fixed at top side 870.
  • the burner deck on the cylindrical part of the burner and the burner deck at the top side are shaped from one single fiber based substrate.
  • a cylindrical burner deck is made out of a tubular fiber based substrate and slid over the internal cylindrical perforated plate or screen structure to form the burner deck.
  • the tubular fiber based substrate can be a circular knitted fabric, or a circular woven fabric or a circular braided fabric; or a circular fabric made in any other technology known in technology.
  • the fixations, with which the fibre based burner deck is fixed at its edges to the internal cylindrical perforated plate or screen structure are 8 - 10 mm wide.
  • the fixations that fix the fiber based burner deck to the perforated plate or the screen near the ionization probe are each 1 - 6 mm wide, preferably 2 - 4 mm wide.
  • FIG. 9 shows a burner 910 connected to an air supply 920 and a gas supply 930.
  • Burner 910 has a fiber based burner deck 940 connected to the frame 950 and at least one ionization probe 960. At position 965 near the ionization probe the burner deck is partially fixed to perforated plate 970 so that the distance between the ionization probe 960 and the burner deck 940 remains constant during burning.
  • the signal obtained from the ionization probe 960 is directed to a first electronic component 980 measuring the current and possibly amplifying the signal for further processing.
  • the electronic component 980 can be any system for measuring currents available in the market and known to the person skilled in the art.
  • the measured current can then further be used for calculation of the air gas ratio and modulation of the air and/or gas supply by control system 990, which is connected to the air and gas supply lines 920 and 930, thereby steering a clean combustion and guaranteeing proof of clean combustion.
  • control system 990 can be any commercially available system and is known as such to the person skilled in the art.
  • control system 990 and electronic component 980 are combined in one system. Such systems are also freely available on the market and known by the person skilled in the art.
  • the used metal fibers for the burner deck e.g.
  • stainless steel fibers with a diameter less than 40 micrometers, e.g. less than 25 micrometers, are obtained by a bundle drawing technique.
  • This technique is disclosed e.g. in US-A-2050298, US-A-3277564 and in US-A- 3394213.
  • Metal wires are forming the starting material and are covered with a coating such as iron or copper.
  • a bundle of these covered wires is subsequently enveloped in a metal pipe. Thereafter the thus enveloped pipe is reduced in diameter via subsequent wire drawing steps to come to a composite bundle with a smaller diameter.
  • the subsequent wire drawing steps may or may not be alternated with an appropriate heat treatment to allow further drawing.
  • Inside the composite bundle the initial wires have been transformed into thin fibers which are embedded separately in the matrix of the covering material.
  • Such a bundle preferably comprises no more than 2000 fibers, e.g. between 500 and 1500 fibers.
  • the covering material can be removed e.g. by solution in an adequate pickling agent or solvent. The final result is the naked fiber bundle.
  • metal fibers for the burner deck such as
  • stainless steel fibers are manufactured in a cost effective way by machining a thin plate material. Such a process is disclosed e.g. in US-A- 4930199.
  • a strip of a thin metal plate is the starting material. This strip is wound around the cylindrical outer surface of a rotatably supported main shaft a number of times and is fixed thereto. The main shaft is rotated at constant speed in a direction opposite to that in which the plate material is wound.
  • a cutter having an edge line expending perpendicularly to the axis of the main shaft is fed at constant speed. The cutter has a specific face angle parallel to the axis of the main shaft. The end surface of the plate material is cut by means of the cutter.
  • metal fibers of the burner deck are extracted or extruded from a melt.
  • the fiber based burner deck is a metal fiber knitted fabric. In another embodiment, the fiber based burner deck is a metal fiber woven fabric. In another embodiment, the fiber based burner deck is a metal fiber nonwoven fabric. In another embodiment, the burner deck is made out of sintered fibrous material.
  • the burner deck is fixed to the perforated plate or to the screen by means of welding. In another embodiment, the burner deck is fixed to the perforated plate or to the screen by means of glueing. In yet another embodiment, the burner deck is fixed to the perforated plate or to the screen by means of stapling. In yet another embodiment, the burner deck is fixed to the perforated plate or to the screen by means of riveting. In yet another embodiment, the burner deck is fixed to the perforated plate or to the screen by means of stitching.
  • the burner deck is fixed to the perforated plate or screen via a combination of techniques.
  • gluing a glue which is resistant to high temperatures need to be used.
  • a glue which is resistant to high temperatures need to be used.
  • An example of such a glue may be a ceramic glue.
  • the distance between the ionization probe and the burner deck is between 3 and 25 mm. In a preferred embodiment, the distance between between the ionization probe and the burner deck is between 5 and 15 mm. In a more preferred embodiment, the distance between the ionization probe and the burner deck is between 7 and 1 1 mm.
  • the partial fixation of the burner deck near the ionization probe is present within an area of 35 mm around the vertical projection of the ionization probe onto the burner deck. In a more preferred embodiment, the partial fixation of the burner deck near the ionization probe is present within an area of 25 mm around the vertical projection of the ionization probe onto the burner deck. In an even more preferred embodiment, the partial fixation of the burner deck near the ionization probe is present within an area of 20 mm around the vertical projection of the ionization probe onto the burner deck.
  • the perforated plate supporting the burner deck has equal perforation patterns over the full surface of the perforated plate.
  • the perforated plate has a higher percentage of perforated area in the region of the ionization probe.
  • the perforated plate has extra perforations in the region of the ionization probe.
  • the perforated plate supporting the burner deck is made out of stainless steel.
  • the screen supporting the burner deck is a woven metal wire screen.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Control Of Combustion (AREA)

Abstract

La présente invention concerne un brûleur (10) comprenant une platine de brûleur à base de fibres (14), une plaque perforée ou un tamis (16) soutenant la platine de brûleur à base de fibres, et au moins une sonde d'ionisation (12). La sonde d'ionisation est installée sur le côté brûleur de la platine de brûleur et définit une distance entre la sonde d'ionisation et la platine de brûleur. Près de la sonde d'ionisation, la platine de brûleur est partiellement fixée à la plaque perforée ou au tamis, de sorte que la distance entre la sonde d'ionisation et la platine de brûleur demeure constante durant la combustion.
PCT/EP2011/072073 2010-12-09 2011-12-07 Brûleur doté d'une platine de brûleur fixée localement WO2012076600A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11802880.2A EP2649372B1 (fr) 2010-12-09 2011-12-07 Brûleur doté d'un couvercle de brûleur fixé localement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10194289 2010-12-09
EP10194289.4 2010-12-09

Publications (1)

Publication Number Publication Date
WO2012076600A1 true WO2012076600A1 (fr) 2012-06-14

Family

ID=44474980

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/072073 WO2012076600A1 (fr) 2010-12-09 2011-12-07 Brûleur doté d'une platine de brûleur fixée localement

Country Status (2)

Country Link
EP (1) EP2649372B1 (fr)
WO (1) WO2012076600A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20130781A1 (it) * 2013-05-13 2014-11-14 Bertelli & Partners Srl Metodo per realizzare un bruciatore perfezionato a fibra metallica per caldaia premiscelata e buricatore cosi' ottenuto

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202016105039U1 (de) * 2016-09-12 2017-09-14 Viessmann Werke Gmbh & Co Kg Gasbrenner
DE102017128802A1 (de) * 2017-12-05 2019-06-06 Vaillant Gmbh Vollvormischender Gasbrenner

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2050298A (en) 1934-04-25 1936-08-11 Thos Firth & John Brown Ltd Metal reducing method
US3277564A (en) 1965-06-14 1966-10-11 Roehr Prod Co Inc Method of simultaneously forming a plurality of filaments
US3394213A (en) 1964-03-02 1968-07-23 Roehr Prod Co Inc Method of forming filaments
US4900245A (en) * 1988-10-25 1990-02-13 Solaronics Infrared heater for fluid immersion apparatus
US4930199A (en) 1987-12-09 1990-06-05 Akira Yanagisawa Method for manufacturing fiber from thin plate material
DE19632983A1 (de) 1996-08-16 1998-02-19 Stiebel Eltron Gmbh & Co Kg Regeleinrichtung für einen Gasbrenner
EP1036984A1 (fr) 1999-03-18 2000-09-20 G. Kromschröder Aktiengesellschaft Brûleur à prémélange gazeux
EP1154203A2 (fr) 2000-05-12 2001-11-14 Siemens Building Technologies AG Dispositif de mesure pour une flamme
US20090120381A1 (en) * 2007-11-09 2009-05-14 Grupo Calorex, S. De R.L. De C.V. Water heater with ionized ignition and electronic control of temperature
EP2180253A1 (fr) * 2008-10-24 2010-04-28 Worgas Bruciatori S.R.L. Sonde de température pour brûleur et brûleur
WO2010094673A1 (fr) 2009-02-20 2010-08-26 Bekaert Combust. Technol. B.V. Brûleur à gaz à pré-mélange avec surveillance et régulation améliorées de la flamme

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2050298A (en) 1934-04-25 1936-08-11 Thos Firth & John Brown Ltd Metal reducing method
US3394213A (en) 1964-03-02 1968-07-23 Roehr Prod Co Inc Method of forming filaments
US3277564A (en) 1965-06-14 1966-10-11 Roehr Prod Co Inc Method of simultaneously forming a plurality of filaments
US4930199A (en) 1987-12-09 1990-06-05 Akira Yanagisawa Method for manufacturing fiber from thin plate material
US4900245A (en) * 1988-10-25 1990-02-13 Solaronics Infrared heater for fluid immersion apparatus
DE19632983A1 (de) 1996-08-16 1998-02-19 Stiebel Eltron Gmbh & Co Kg Regeleinrichtung für einen Gasbrenner
EP1036984A1 (fr) 1999-03-18 2000-09-20 G. Kromschröder Aktiengesellschaft Brûleur à prémélange gazeux
EP1154203A2 (fr) 2000-05-12 2001-11-14 Siemens Building Technologies AG Dispositif de mesure pour une flamme
US20090120381A1 (en) * 2007-11-09 2009-05-14 Grupo Calorex, S. De R.L. De C.V. Water heater with ionized ignition and electronic control of temperature
EP2180253A1 (fr) * 2008-10-24 2010-04-28 Worgas Bruciatori S.R.L. Sonde de température pour brûleur et brûleur
WO2010094673A1 (fr) 2009-02-20 2010-08-26 Bekaert Combust. Technol. B.V. Brûleur à gaz à pré-mélange avec surveillance et régulation améliorées de la flamme

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20130781A1 (it) * 2013-05-13 2014-11-14 Bertelli & Partners Srl Metodo per realizzare un bruciatore perfezionato a fibra metallica per caldaia premiscelata e buricatore cosi' ottenuto

Also Published As

Publication number Publication date
EP2649372A1 (fr) 2013-10-16
EP2649372B1 (fr) 2015-02-11

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