EP2789911B1 - Gasvormischbrenner - Google Patents
Gasvormischbrenner Download PDFInfo
- Publication number
- EP2789911B1 EP2789911B1 EP13162937.0A EP13162937A EP2789911B1 EP 2789911 B1 EP2789911 B1 EP 2789911B1 EP 13162937 A EP13162937 A EP 13162937A EP 2789911 B1 EP2789911 B1 EP 2789911B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- burner
- fiber based
- deck
- burner deck
- thicker
- 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.)
- Active
Links
- 239000000835 fiber Substances 0.000 claims description 103
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 27
- 239000004744 fabric Substances 0.000 claims description 15
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 239000002759 woven fabric Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Images
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
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- 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
- F23D2203/1012—Flame diffusing means characterised by surface shape tubular
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/10—Flame diffusing means
- F23D2203/105—Porous plates
- F23D2203/1055—Porous plates with a specific void range
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2207/00—Ignition devices associated with burner
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/00019—Outlet manufactured from knitted fibres
Definitions
- the invention relates to gas premix burners that have a fiber based burner deck.
- the gas premix burners use an ignition electrode to ignite the burner.
- Such gas premix burner can e.g. be used in boilers or in instantaneous water heaters.
- Gas premix burners with fiber based burner decks are known. Such burners can have a metal fiber based knitted or woven fabric as burner deck positioned on a perforated plate or woven screen (a woven wire mesh) which is acting as gas distribution plate. It is a benefit of such burners that the metal fiber based burner deck (e.g. a knitted or woven fabric) can freely expand when hot, while the perforated plate, the woven wire mesh or the expanded metal sheet is remaining sufficiently cool. Such burners are e.g. known from US4657506 and WO2004/092647 .
- DE29708377U provides an improvement to the ignition problem by providing the perforated gas distribution plate with a higher percentage of perforated surface area in the region where the ignition electrode is positioned than elsewhere.
- this solution is not ideal, as it cannot be easily used in burners of small size or in burners with complex shape burner decks.
- the solution can also not readily be used or adapted for burners that have a woven wire mesh as gas distribution surface.
- the primary objective of the invention is to provide a gas premix burner with a fiber based burner deck which can be reliably ignited by means of the ignition electrode of the burner.
- the burner is a fully premixed gas burner.
- the characterizing feature ensures that the gas premix burner can be ignited in a proper and reliable way, eliminating problems of bad, late or noisy ignition.
- burners according to the invention can be made that have
- burners according to the invention can be made that have a small size as well as burners with burner decks of complex shape, e.g. burners with undulated, or double curved burner deck or at least double curved burner deck, while having excellent ignition properties.
- the part of the region in which the fiber based burner deck is thicker in at least part of the region where the ignition electrode is located comprises a circular surface of at least 15 mm diameter, and preferably of at least 20 mm diameter, e.g. of 25 mm diameter.
- the circular surface is determined when the fiber based burner deck is taken off the burner and put flat on a surface to observe or determine the region.
- the fiber based burner deck is in one or more elongated zones of the fiber based burner deck thicker than in at least some other areas of the fiber based burner deck, wherein at least one of the elongated zones is starting from the at least part of the region at the ignition electrode where the fiber based burner deck is thicker.
- such elongated zones cover substantially the full length of the burner, in order to facilitate ignition over the full length of the burner.
- elongated zones have a width of at least 8 mm, and preferably of less than 20 mm. A preferred range of the width of elongated zones is between 10 and 15 mm.
- the thickness of the fiber based burner deck is constant.
- the fiber based burner deck is a weft knitted fabric which is in one or more elongated zones of the fiber based burner deck thicker than in at least some other areas of the fiber based burner deck and wherein at least one of the elongated zones is starting from the at least part of the region at the ignition electrode where the fiber based burner deck is thicker.
- at least one of the elongated zones is substantially parallel with the production direction of the weft knitted fabric.
- the thickness of the fiber based burner deck where it is thicker is at least 40% higher than the thickness outside where it is thicker.
- Preferred is when the porosity of the fiber based burner deck where it is thicker is less than 92%.
- the porosity of the fiber based burner deck outside where it is thicker is higher than 75% but preferably below 85%.
- the fiber based burner deck comprises metal fibers, preferably stainless steel fibers.
- the different thickness values of the fiber based burner deck can be obtained by locally compressing the fiber based burner deck or by compressing the full surface of the fiber based burner deck, but with a lower pressure in the areas where a higher thickness is required.
- the variation in fabric thickness can be made before or after applying the fiber based burner deck onto the perforated plate, woven wire mesh or expanded metal sheet.
- the fiber based burner deck can comprise metal fibers.
- metal fibers are stainless steel fibers.
- a specifically preferred range of stainless steel fibers are chromium and aluminium comprising stainless steel fibers as in DIN 1.4767, e.g. as are known under the trademark FeCrAlloy.
- Metal fibers for the burner deck e.g. stainless steel fibers, e.g. with a diameter less than 40 micrometers, e.g. less than 25 micrometers, can be 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 form 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.
- the initial wires have been transformed into thin fibers which are embedded separately in the matrix of the covering material.
- 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 can be manufactured in a cost effective way by machining a thin plate material.
- 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.
- Another alternative way of producing metal fibers is machining fibers from a solid block of metal.
- ceramic fibers can be used in the fiber based burner deck.
- the fiber based burner deck can comprise a textile fabric, e.g. a textile fabric comprising yarns.
- the fiber based burner deck can e.g. comprise or be a woven fabric or a knitted fabric (weft knitted or warp knitted) or a braided fabric comprising yarns with e.g. metal fibers, preferably stainless steel fibers.
- the yarns can be spun from stretchbroken fibers (such as bundle drawn stretch broken fibers) or yarns made from shaved or machined fibers.
- the yarns can be plied yarns, e.g. two ply, three ply...
- Preferred fabrics made from metal fibers have a weight of between 0.6 and 3 kg/m 2 ; preferably between 0.75 and 2.6 kg/m 2 , even more preferred between 0.75 and 2.5 kg/m 2 , and even more preferred between 0.75 and 1.3 kg/m 2 .
- Alternative fiber based burner decks that can be used in the invention can comprise or can be nonwoven fabrics, e.g. comprising metal fibers (preferably stainless steel fibers).
- the nonwoven fabrics can be consolidated by different techniques (e.g. needle punching) and can be sintered or not sintered.
- the gas premix burner according to the invention can be provided in a wide range of different shapes. Examples are flat burners, cylindrical burners and burners that have a conical or frustoconical shape. As known by the person skilled in the art a flat burner can have and mostly has a curved shape or can even have an undulated shape.
- the class of flat burners is distinguished from the other main class of gas premix burners comprising burners that have a conical, cylindrical or frustoconical shape.
- Flat burners with undulated shape or with an otherwise complex shape can be made according to the invention, preferably by using a woven wire mesh onto which the fiber based burner deck is placed.
- a second aspect of the invention are boilers or instantaneous water heaters that comprise a gas premix burner as in the first aspect of the invention.
- Figure 1 shows a flat gas premix burner 100 according to the invention.
- Figure 2 shows a cross section according to line II-II of the flat gas premix burner 100 of figure 1 .
- the gas premix burner 100 has a frame 110 and a fiber based burner deck 130 supported by a woven wire mesh 120.
- the fiber based burner deck can be supported by a perforated metal plate or by an expanded metal sheet.
- the fiber based burner deck 130 can e.g. have a length of 224 mm and a width of 70 mm.
- the burner has an ignition electrode 160.
- the fiber based burner deck is thicker in the region 135 where ignition electrode 160 is located, than in other areas of the fiber based burner deck.
- This region 135 is e.g. circular in shape with a diameter of 25 mm.
- the fiber based burner deck is also in an elongated zone 137 of the fiber based burner deck thicker than in at least some other areas of the fiber based burner deck.
- This elongated zone 137 is starting from the region 135 at the ignition electrode where the fiber based burner deck is thicker.
- the elongated zone 137 is positioned in the length direction of the burner 100.
- the elongated zone 137 is positioned centrally with respect of the width of the fiber based burner deck 130.
- the elongated zone 137 e.g. has a width of 15 mm.
- FIG 3 shows a cylindrical gas premix burner 300.
- the burner 300 has a flange 305 with an inlet through which premix gas is entered into the cylindrical burner 300.
- the burner 300 has a cylindrical fiber based burner deck 330, supported by a cylindrical perforated metal plate (not shown on the figure).
- the fiber based burner deck 330 can be supported by a cylindrical woven wire mesh or expanded metal sheet.
- the burner also has an end cap 340.
- the burner has an ignition electrode 360.
- the fiber based burner deck is thicker in the region 335 where ignition electrode 360 is located, than in other areas of the fiber based burner deck.
- This region 335 is e.g. oval in shape.
- the fiber based burner deck is in one or more elongated zones 337 of the fiber based burner deck thicker than in at least some other areas of the fiber based burner deck.
- the elongated zones 337 are starting from the region 335 at the ignition electrode where the fiber based burner deck is thicker.
- a fabric knitted from yarns made out of stainless steel fibers according to DIN 1.4767 was used as fiber based burner deck.
- the knitted fabric has a surface weight of 1.4 kg/m 2 . Where the fabric is thicker, it has a thickness of 1.6 mm and a porosity of 89%. Outside the thicker zones, it has a thickness of 1.1 mm and a porosity of 82%.
- the exemplary burners of the invention have shown to have reliable and fast ignition, without the occurrence of acoustic instabilities at ignition of the burner. Where the fiber based burner deck is thicker, the flow rate of premix gas is higher, resulting in it that ignition by the ignition electrode is facilitated.
- burners according to the invention in which the burner deck is thicker in one or more elongated zones of the fiber based burner deck ignition over the full surface burner deck is further facilitated as the thicker elongated zones showed to facilitate ignition of the full burner deck.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Claims (10)
- Gasvormischbrenner (100, 300), aufweisend:- eine perforierte Platte, einen Wellengitterdraht (120) oder ein Streckmetallblech;- ein faserbasiertes Brennerdeck (130, 330), das auf der perforierten Platte, dem Wellengitterdraht (120) oder Streckmetallblech angeordnet ist, wobei das faserbasierte Brennerdeck (130, 330) eine gleiche Masse pro Einheit eines Oberflächenbereichs über die vollständige Oberfläche des Brennerdecks (130, 330) hinweg aufweist;- eine Zündelektrode (160, 360) zum Zünden des Gasvormischbrenners,wobei das faserbasierte Brennerdeck (130, 330) in mindestens einem Teil des Bereichs (135, 335), in dem sich die Zündelektrode (160, 360) befindet, stärker als in mindestens einigen anderen Bereichen des faserbasierten Brennerdecks (130, 330) ist, um zu gewährleisten, dass der Gasvormischbrenner zweckmäßig und zuverlässig gezündet werden kann.
- Gasvormischbrenner (100, 300) nach Anspruch 1, wobei der Teil des Bereichs, in dem das faserbasierte Brennerdeck (130, 330) stärker ist, eine kreisförmige Oberfläche mit einem Durchmesser von mindestens 15 mm aufweist.
- Gasvormischbrenner (100, 300) nach einem der vorhergehenden Ansprüche, wobei die Stärke des Gasbrennerdecks (130, 330), wo es stärker ist, mindestens 40% höher als die Stärke außerhalb der stärkeren Stelle ist.
- Gasvormischbrenner (100, 300) nach einem der vorhergehenden Ansprüche, wobei die Porosität des faserbasierten Brennerdecks (130, 330), wo es stärker ist, weniger als 92% beträgt.
- Gasvormischbrenner (100, 300) nach einem der vorhergehenden Ansprüche, wobei die Porosität des faserbasierten Brennerdecks (130, 330) außerhalb der Stelle, wo es stärker ist, höher als 75% ist, jedoch vorzugsweise unterhalb von 85% liegt.
- Gasvormischbrenner (100, 300) nach einem der vorhergehenden Ansprüche, wobei das faserbasierte Brennerdeck Metallfasern, vorzugsweise Edelstahlfasern, aufweist.
- Gasvormischbrenner (100, 300) nach einem der vorhergehenden Ansprüche, wobei das faserbasierte Brennerdeck (130, 330) in einer oder mehr gestreckten Zonen (137, 337) des faserbasierten Brennerdecks (130, 330) stärker als in mindestens einigen anderen Bereichen des faserbasierten Brennerdecks (130, 330) ist, wobei mindestens eine der gestreckten Zonen (137, 337) ab dem mindestens einen Teil des Bereichs an der Zündelektrode (160, 360) beginnt, an dem das faserbasierte Brennerdeck stärker ist.
- Gasvormischbrenner (100, 300) nach Anspruch 7, wobei das faserbasierte Brennerdeck (130, 330) ein Gestrick ist, wobei vorzugsweise mindestens eine der gestreckten Zonen (137, 337) im Wesentlichen parallel zur Erzeugungsrichtung des Gestricks ist.
- Kessel, aufweisend einen Gasvormischbrenner (100, 300) gemäß einem der vorhergehenden Ansprüche.
- Durchlaufwassererhitzer, aufweisend einen Gasvormischbrenner (100, 300) gemäß einem der Ansprüche 1 bis 8.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13162937.0A EP2789911B1 (de) | 2013-04-09 | 2013-04-09 | Gasvormischbrenner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13162937.0A EP2789911B1 (de) | 2013-04-09 | 2013-04-09 | Gasvormischbrenner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2789911A1 EP2789911A1 (de) | 2014-10-15 |
EP2789911B1 true EP2789911B1 (de) | 2016-07-20 |
Family
ID=48047904
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13162937.0A Active EP2789911B1 (de) | 2013-04-09 | 2013-04-09 | Gasvormischbrenner |
Country Status (1)
Country | Link |
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EP (1) | EP2789911B1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019526777A (ja) * | 2016-09-13 | 2019-09-19 | ベーカート・コンバスチョン・テクノロジー・ベスローテン・フェンノートシャップ | 予混合ガスバーナ |
US11326808B2 (en) | 2017-07-13 | 2022-05-10 | Bekaert Combustion Technology B.V. | Premix gas burner |
IT202100026435A1 (it) * | 2021-10-15 | 2023-04-15 | Beckett Thermal Solutions S R L | Membrana di combustione per un bruciatore a gas |
IT202100026447A1 (it) * | 2021-10-15 | 2023-04-15 | Beckett Thermal Solutions S R L | Membrana di combustione per un bruciatore a gas |
IT202100026453A1 (it) * | 2021-10-15 | 2023-04-15 | Beckett Thermal Solutions S R L | Membrana di combustione per un bruciatore a gas |
Family Cites Families (10)
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 |
FR2526919B1 (fr) * | 1982-05-17 | 1987-05-22 | Osaka Gas Co Ltd | Bruleur a combustion en surface alimente totalement en air primaire |
US4657506A (en) | 1984-12-10 | 1987-04-14 | Glowcore Corporation | Gas burner |
US4721456A (en) * | 1986-05-08 | 1988-01-26 | A. O. Smith Corporation | Combustion element for a radiant energy burner and method of making same |
CA1320616C (en) | 1987-12-09 | 1993-07-27 | Akira Yanagisawa | Fiber manufacturing method and apparatus therefor |
BE1006069A3 (nl) * | 1992-07-01 | 1994-05-03 | Bekaert Sa Nv | Heterogene breistof omvattende metaalvezels. |
DE29708377U1 (de) | 1997-05-09 | 1997-07-17 | Viessmann Werke Gmbh & Co, 35108 Allendorf | Gasflächenbrenner |
CN100557310C (zh) | 2003-04-18 | 2009-11-04 | 贝卡尔特股份有限公司 | 气体燃烧室 |
-
2013
- 2013-04-09 EP EP13162937.0A patent/EP2789911B1/de active Active
Also Published As
Publication number | Publication date |
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EP2789911A1 (de) | 2014-10-15 |
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