EP3336427B1 - Gas burner - Google Patents
Gas burner Download PDFInfo
- Publication number
- EP3336427B1 EP3336427B1 EP16382614.2A EP16382614A EP3336427B1 EP 3336427 B1 EP3336427 B1 EP 3336427B1 EP 16382614 A EP16382614 A EP 16382614A EP 3336427 B1 EP3336427 B1 EP 3336427B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- air
- main
- distribution means
- communicated
- 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.)
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Links
- 239000007789 gas Substances 0.000 description 100
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- 239000000203 mixture Substances 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- -1 propane or butane Chemical compound 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
Images
Classifications
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- 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
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/9901—Combustion process using hydrogen, hydrogen peroxide water or brown gas as fuel
-
- 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
-
- 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
- F23D2900/00012—Liquid or gas fuel burners with flames spread over a flat surface, either premix or non-premix type, e.g. "Flächenbrenner"
-
- 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
- F23D2900/14—Special features of gas burners
- F23D2900/14641—Special features of gas burners with gas distribution manifolds or bars provided with a plurality of nozzles
Definitions
- the present invention relates to gas burners, and more specifically to burners for gas boilers.
- a burner is a device for burning gas, liquid and solid fuel (for example, pellets) such that heat is generated by means of flame.
- a burner is usually associated with a boiler or a generator for heating water.
- burners in which said gas, usually mixed with air, burns when a spark is generated. Burners of this type in which gas and air are mixed before ignition occurs are called premix burners. However, burners called diffusion burners in which combustible gas and oxygen are not mixed beforehand, but rather mixed where ignition occurs are also known.
- patent document JP2006056743A discloses a gas burner comprising a structure in which gas distribution means direct a combustible gas, such as hydrogen, to a mixing area, and oxygen distribution means direct oxygen to the mixing area.
- the gas distribution means comprise an open chamber arranged inside said structure and the oxygen distribution means comprise a plurality of conduits arranged inside said open chamber such that the combustible gas flows between the oxygen conduits.
- the gas distribution means are communicated with a combustible gas inlet conduit and the oxygen distribution means with an oxygen inlet conduit.
- DE4317797C1 discloses a gas burner wherein a fuel gas and a gas comprising oxygen are guided independently through concentric conduits.
- the gas burner comprises a chamber for the fuel gas and another chamber for the gas with oxygen.
- DE4339012A1 discloses a gas burner comprising an air distribution means communicated with an air inlet conduit and gas distribution means communicated with a gas inlet conduit.
- the gas distribution means comprise main conduits communicated with the gas inlet conduit and which transport the combustible gas to a mixing area.
- the air distribution means comprises an air chamber communicated with the air inlet conduit, part of each main conduit being allocated in said chamber.
- the air distribution means also comprise a distribution plate comprising a plurality of passage openings for directing the air towards the outlets of each main conduit and a centering plate arranged below said distribution plate, so that a gap is provided between said centering plate and the distribution plate. The air from the air chamber passes into said gap and is directed to the surface through the passage openings.
- DE10052614A1 also discloses a gas burner comprising an air distribution means communicated with an air inlet conduit and gas distribution means communicated with a gas inlet conduit.
- the gas distribution means comprise main conduits communicated with the gas inlet conduit and which transport the combustible gas to a mixing area.
- the air distribution means comprises an air chamber communicated with the air inlet conduit, part of each main conduit being allocated in said chamber.
- the air distribution means also comprise a distribution plate comprising a plurality of passage openings for directing the air towards the outlets of each main conduit.
- the gas distribution means also comprise a main chamber which is divided into two auxiliary chambers by a separation wall, the first auxiliary chamber being communicated with the gas inlet conduit and the second auxiliary chamber being communicated with each main conduit. Both auxiliary chambers are communicated through holes disposed in the separation wall.
- the object of the invention is to provide a gas burner, as defined in the claims.
- the gas burner according to the invention comprises a structure comprising gas distribution means which are configured for directing combustible gas to a mixing area, and air distribution means configured for directing air to said mixing area.
- the gas distribution means are communicated with a combustible gas inlet conduit and the air distribution means are communicated with an air inlet conduit.
- the gas distribution means comprise a plurality of main conduits communicated with the gas inlet conduit and configured for transporting combustible gas to the mixing area providing a mixing point at the outlet of each main conduit.
- the air distribution means comprise an air chamber communicated with the air inlet conduit in which at least part of each main conduit is housed.
- the air distribution means also comprise a distribution plate arranged in the mixing area comprising a plurality of passage openings, each passage opening being configured for directing air to at least one mixing point.
- the gas distribution means comprise a main chamber, which is communicated with the gas inlet conduit and with each main conduit, and a constricted area disposed between the main chamber and each main conduit.
- Each main conduit is communicated with the main chamber through a respective constricted area.
- the gas burner of the invention allows efficiently directing the required air to the combustible gas so that it burns quickly and effectively when the ignition means, for example, a spark generator, are activated.
- the ignition means for example, a spark generator
- Focusing the passage of air through the passage openings of the distribution plate assures, on one hand, that the amount of air required for combustible gas ignition to occur reaches each mixing point, and on the other hand, that the same amount of air reaches all the mixing points, leading to the flames that burn at the outlet of the main conduits being similar, so a homogenous distribution of flames throughout the burner is achieved.
- FIG. 1 shows an embodiment of a gas burner 1 according to the invention.
- Said burner 1 comprises a structure 1A comprising gas distribution means which are configured for directing combustible gas to a mixing area 7, and air distribution means configured for directing air to said mixing area 7.
- the gas distribution means are communicated with a combustible gas inlet conduit 2 and the air distribution means are communicated with an air inlet conduit 3.
- the gas distribution means comprise a plurality of main conduits 4b, as shown in Figures 2 to 5 , configured for transporting combustible gas to the mixing area 7 providing a mixing point at the outlet of each main conduit 4b.
- the air distribution means comprise an air chamber 5 which is communicated with the air inlet conduit 3, said main conduits 4b being at least partially housed in said air chamber 5.
- the air distribution means also comprise a distribution plate 5' arranged in the mixing area 7 comprising a plurality of passage openings 5a, each passage opening 5a being configured for directing air to at least one mixing point.
- the required air is efficiently directed to the combustible gas so that it burns quickly and effectively when ignition means, not shown in the drawings, for example a spark generator, are activated.
- Focusing the passage of air through the passage openings 5a of the distribution plate 5' assures, on one hand, that the amount of air required for combustible gas ignition to occur reaches each mixing point, and on the other hand, that the same amount of air reaches all the mixing points equally, leading to the flames that burn at the outlet of the main conduits 4b being similar, so a homogenous distribution of flames throughout the burner 1 is achieved.
- the air inlet conduit 3, the gas inlet conduit 2 and the air and gas distribution means are independent from one another, i.e., the combustible gas and air are transported to the mixing area 7 in an independent manner and further in a fragmented manner through the different main conduits 4b and the different passage openings 5a of the distribution plate 5'.
- each main conduit 4b a mixing point is generated since it is there where the combustible gas and the oxygen contained in the air transported by the air distribution means will mix, the oxygen being necessary for combustion to occur, i.e., to generate the flame, when the ignition means are activated.
- the mixing points generated at the outlet of all the main conduits 4b define the mixing area 7 of the burner 1, successfully improving the quality of the air-gas mixture in the burner 1 of the invention since this leads to the air-gas mixture in said mixing area 7 being homogenous, which will give rise to the formation of homogenous flames throughout the burner 1.
- the combustible gas used in the preferred embodiment of the invention is hydrogen, although it is also possible to use natural gas, liquefied petroleum gas, such as propane or butane, as well as hydrogenated mixtures of natural gas and/or biogas which can comprise up to 25% or even up to 50% of hydrogen.
- each main conduit 4b is configured in the form of a tube and each passage opening 5a of the distribution plate 5' is a circular hole arranged coaxially with a respective main conduit 4b, as seen in Figure 4 , the diameter of said passage opening 5a logically being larger than the corresponding main conduit 4b to allow the passage of air through the distribution plate 5' and the respective main gas conduit 4b.
- the diameter of the passage opening 5a is twice the diameter of the corresponding main conduit 4b.
- the air passage openings 5a are at the same height as the outlets of the main gas conduits 4b, as seen in Figures 3, 4 or 5 , i.e., the outer surface of the distribution plate 5' is arranged at the same height as the outlets of the main conduits 4b.
- the air passage openings 5a are arranged above the main gas conduits 4b.
- the air passage openings 5a are arranged below the main gas conduits 4b.
- the distribution plate 5' of the preferred embodiment of the invention comprises a reduced thickness in comparison with the height of the structure 1A of the burner 1, as seen in Figure 4 , said thickness being the smallest possible thickness so that said plate 5' can withstand the high temperatures to which it will be subjected when the burner 1 is in use without deforming excessively.
- the material of the distribution plate 5' according to the preferred embodiment of the invention is steel, preferably steel that is resistant to high temperatures. above 900°C for example.
- the passage openings 5a have the same section along the entire width of the distribution plate 5', as seen in the detail of Figure 4 , i.e., the wall of the passage openings 5a is a straight wall.
- the section of the passage openings 5a increases along the width of the distribution plate 5' in the air exit direction.
- the section of the passage openings 5a decreases along the width of the distribution plate 5' in the air exit direction.
- variants like the variants described above, are also intended for favoring, according to need and to the properties of the combustible gas used, the mixing of combustible gas with air to assure the correct ignition. Likewise, it would also be possible to combine all these variants with one another, or with the preferred embodiment, for optimizing the correct mixing of combustible gas and air.
- the gas distribution means comprise a main chamber 4 which is communicated with the gas inlet conduit 2 as well as with each main conduit 4b, as seen in Figures 2 or 3 .
- Said main chamber 4 is independent of the air chamber 5, i.e., both chambers 4 and 5 are not communicated with one another.
- the main chamber 4 as well as the gas inlet conduit 2 are arranged in the lower part of the burner 1, the air chamber 5 being arranged above the main chamber 4 and the air conduit 3 being arranged above the gas conduit 2. Both chambers 4 and 5 are separated by a separation plate 8, as shown in Figures 3, 4 or 5 .
- the gas distribution means of the gas burner 1 of the invention comprise a constricted area 4a between the main chamber 4 and each main conduit 4b.
- there is one constricted area 4a for each main conduit 4b such that each main conduit 4b is communicated with the main chamber 4 through a respective constricted area 4a, as seen in Figure 3 .
- Said constricted areas 4a allow regulating combustible gas head loss so that all the main conduits 4b conduct the same amount of combustible gas.
- constricted areas 4a are arranged in the lower part of the separation plate 8, one of the ends of each constricted area 4a being in contact with the main chamber 4.
- the corresponding main conduits 4b are arranged in contact with the other end of each constricted area 4a, said main conduits 4b being housed in a corresponding housing comprised in the separation plate 8. Each housing is arranged after a corresponding constricted area 4a.
- the cross-section of the main conduits 4b is larger than the section of the constricted areas 4a, as shown in Figures 3, 4 or 5 .
- the speed of the combustible gas directed to the corresponding mixing point in all the main conduits 4b is therefore slowed down.
- the sections and lengths of all the constricted areas 4a are the same, as well as of all the main conduits 4b. This thereby assures that the same amount of gas reaches all the mixing points and with the same intensity, therefore, the flame generated in all the mixing points will be similar, which favors a homogenous distribution of the flames in the mixing area 7, giving rise to uniform heat distribution in said mixing area 7.
- the main chamber 4 comprises a cross-section which gradually decreases as it moves away from the gas inlet conduit 2, as shown in Figure 3 , resembling a triangular cross-section.
- the speed of the combustible gas in all the constricted areas 4a can thereby be kept equal.
- the main conduits 4b of the distribution means are parallel to one another, said main conduits 4b in the preferred embodiment of the invention being arranged in a staggered manner, as shown in Figures 2 or 4 .
- the gas burner 1 comprises a ceramic structure 6, preferably of silicon carbide fibers, arranged on the mixing area 7, said ceramic structure 6 being fixed preferably on the distribution plate 5'.
- said ceramic structure 6 has been depicted in a transparent manner to favor understanding of the drawings.
- the ceramic structure 6 is a porous structure and the flames generated at each mixing point can be partially contained inside said ceramic structure 6, flame peaks that may give rise to a poor operation of the gas boiler 1 being prevented.
- the ceramic structure 6 As a result of the ceramic structure 6, combustible gas and air blend together so that the air-gas mixture also expands horizontally, i.e., according to a direction substantially perpendicular to the gas exit direction of the corresponding main conduit 4b, such that a homogeneous distribution of the air-gas mixture is obtained not only in the gas exit direction of the main conduits 4b, but also in a direction perpendicular to it. Therefore, the distribution of flames obtained in the mixing area 7 will be a uniform and homogenous distribution throughout the entire burner 1, flame peaks and valleys being prevented.
- the length of the gas burner 1 is in a range between 100 mm and 200 mm, the width is in a range between 80 mm and 120 mm and the height is in a range between 25 mm and 40 mm.
- the gas burner 1 of the invention is suitable to be used in a gas boiler, preferably in a domestic boiler as a result of its small dimensions, giving rise to a safe and reliable boiler where it is assured that heat distribution throughout the entire burner 1 is homogenous, while at the same time preventing flame flashback.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Description
- The present invention relates to gas burners, and more specifically to burners for gas boilers.
- A burner is a device for burning gas, liquid and solid fuel (for example, pellets) such that heat is generated by means of flame. A burner is usually associated with a boiler or a generator for heating water.
- The most widely used burners are gas burners in which said gas, usually mixed with air, burns when a spark is generated. Burners of this type in which gas and air are mixed before ignition occurs are called premix burners. However, burners called diffusion burners in which combustible gas and oxygen are not mixed beforehand, but rather mixed where ignition occurs are also known.
- In this sense, patent document
JP2006056743A -
DE4317797C1 discloses a gas burner wherein a fuel gas and a gas comprising oxygen are guided independently through concentric conduits. The gas burner comprises a chamber for the fuel gas and another chamber for the gas with oxygen. -
DE4339012A1 discloses a gas burner comprising an air distribution means communicated with an air inlet conduit and gas distribution means communicated with a gas inlet conduit. The gas distribution means comprise main conduits communicated with the gas inlet conduit and which transport the combustible gas to a mixing area. In the other hand, the air distribution means comprises an air chamber communicated with the air inlet conduit, part of each main conduit being allocated in said chamber. The air distribution means also comprise a distribution plate comprising a plurality of passage openings for directing the air towards the outlets of each main conduit and a centering plate arranged below said distribution plate, so that a gap is provided between said centering plate and the distribution plate. The air from the air chamber passes into said gap and is directed to the surface through the passage openings. -
DE10052614A1 also discloses a gas burner comprising an air distribution means communicated with an air inlet conduit and gas distribution means communicated with a gas inlet conduit. The gas distribution means comprise main conduits communicated with the gas inlet conduit and which transport the combustible gas to a mixing area. In the other hand, the air distribution means comprises an air chamber communicated with the air inlet conduit, part of each main conduit being allocated in said chamber. The air distribution means also comprise a distribution plate comprising a plurality of passage openings for directing the air towards the outlets of each main conduit. The gas distribution means also comprise a main chamber which is divided into two auxiliary chambers by a separation wall, the first auxiliary chamber being communicated with the gas inlet conduit and the second auxiliary chamber being communicated with each main conduit. Both auxiliary chambers are communicated through holes disposed in the separation wall. - The object of the invention is to provide a gas burner, as defined in the claims.
- The gas burner according to the invention comprises a structure comprising gas distribution means which are configured for directing combustible gas to a mixing area, and air distribution means configured for directing air to said mixing area. The gas distribution means are communicated with a combustible gas inlet conduit and the air distribution means are communicated with an air inlet conduit.
- The gas distribution means comprise a plurality of main conduits communicated with the gas inlet conduit and configured for transporting combustible gas to the mixing area providing a mixing point at the outlet of each main conduit.
- The air distribution means comprise an air chamber communicated with the air inlet conduit in which at least part of each main conduit is housed.
- The air distribution means also comprise a distribution plate arranged in the mixing area comprising a plurality of passage openings, each passage opening being configured for directing air to at least one mixing point.
- The gas distribution means comprise a main chamber, which is communicated with the gas inlet conduit and with each main conduit, and a constricted area disposed between the main chamber and each main conduit. Each main conduit is communicated with the main chamber through a respective constricted area.
- The gas burner of the invention allows efficiently directing the required air to the combustible gas so that it burns quickly and effectively when the ignition means, for example, a spark generator, are activated.
- Focusing the passage of air through the passage openings of the distribution plate assures, on one hand, that the amount of air required for combustible gas ignition to occur reaches each mixing point, and on the other hand, that the same amount of air reaches all the mixing points, leading to the flames that burn at the outlet of the main conduits being similar, so a homogenous distribution of flames throughout the burner is achieved.
- These and other advantages and features of the invention will become evident in view of the drawings and the detailed description of the invention.
-
-
Figure 1 shows a perspective view of the gas burner according to an embodiment of the invention. -
Figure 2 shows a sectioned perspective view of the gas burner ofFigure 1 . -
Figure 3 shows a sectioned front view of the gas burner ofFigure 1 . -
Figure 4 shows a perspective view of a first detail of the gas burner ofFigure 1 . -
Figure 5 shows a second detail of the gas burner ofFigure 1 . -
Figure 1 shows an embodiment of a gas burner 1 according to the invention. Said burner 1 comprises astructure 1A comprising gas distribution means which are configured for directing combustible gas to a mixing area 7, and air distribution means configured for directing air to said mixing area 7. The gas distribution means are communicated with a combustible gas inlet conduit 2 and the air distribution means are communicated with anair inlet conduit 3. - The gas distribution means comprise a plurality of
main conduits 4b, as shown inFigures 2 to 5 , configured for transporting combustible gas to the mixing area 7 providing a mixing point at the outlet of eachmain conduit 4b. - The air distribution means comprise an
air chamber 5 which is communicated with theair inlet conduit 3, saidmain conduits 4b being at least partially housed in saidair chamber 5. - The air distribution means also comprise a distribution plate 5' arranged in the mixing area 7 comprising a plurality of
passage openings 5a, each passage opening 5a being configured for directing air to at least one mixing point. - With the gas burner of the invention, the required air is efficiently directed to the combustible gas so that it burns quickly and effectively when ignition means, not shown in the drawings, for example a spark generator, are activated.
- Focusing the passage of air through the
passage openings 5a of the distribution plate 5' assures, on one hand, that the amount of air required for combustible gas ignition to occur reaches each mixing point, and on the other hand, that the same amount of air reaches all the mixing points equally, leading to the flames that burn at the outlet of themain conduits 4b being similar, so a homogenous distribution of flames throughout the burner 1 is achieved. - The
air inlet conduit 3, the gas inlet conduit 2 and the air and gas distribution means are independent from one another, i.e., the combustible gas and air are transported to the mixing area 7 in an independent manner and further in a fragmented manner through the differentmain conduits 4b and thedifferent passage openings 5a of the distribution plate 5'. - As has already been described, at the outlet of each
main conduit 4b a mixing point is generated since it is there where the combustible gas and the oxygen contained in the air transported by the air distribution means will mix, the oxygen being necessary for combustion to occur, i.e., to generate the flame, when the ignition means are activated. - Likewise, since only combustible gas (oxygen-free) is transported through the inside of the
main conduits 4b, flame flashback into the burner 1 is prevented, preventing the burner from being able to explode. - The mixing points generated at the outlet of all the
main conduits 4b define the mixing area 7 of the burner 1, successfully improving the quality of the air-gas mixture in the burner 1 of the invention since this leads to the air-gas mixture in said mixing area 7 being homogenous, which will give rise to the formation of homogenous flames throughout the burner 1. - The combustible gas used in the preferred embodiment of the invention is hydrogen, although it is also possible to use natural gas, liquefied petroleum gas, such as propane or butane, as well as hydrogenated mixtures of natural gas and/or biogas which can comprise up to 25% or even up to 50% of hydrogen.
- In an embodiment not being part of the invention, each
main conduit 4b is configured in the form of a tube and each passage opening 5a of the distribution plate 5' is a circular hole arranged coaxially with a respectivemain conduit 4b, as seen inFigure 4 , the diameter of said passage opening 5a logically being larger than the correspondingmain conduit 4b to allow the passage of air through the distribution plate 5' and the respectivemain gas conduit 4b. In a non-limiting example, the diameter of the passage opening 5a is twice the diameter of the correspondingmain conduit 4b. - In an embodiment not being part of the invention, the
air passage openings 5a are at the same height as the outlets of themain gas conduits 4b, as seen inFigures 3, 4 or 5 , i.e., the outer surface of the distribution plate 5' is arranged at the same height as the outlets of themain conduits 4b. - Optionally, in a variant not shown in the drawings and not being part of the invention, the
air passage openings 5a are arranged above themain gas conduits 4b. - In another variant not shown in the drawings and not being part of the invention, the
air passage openings 5a are arranged below themain gas conduits 4b. - These two variants are intended for favoring, according to need and to the properties of the combustible gas used, the mixing of combustible gas with air to assure the correct ignition.
- The distribution plate 5' of the preferred embodiment of the invention comprises a reduced thickness in comparison with the height of the
structure 1A of the burner 1, as seen inFigure 4 , said thickness being the smallest possible thickness so that said plate 5' can withstand the high temperatures to which it will be subjected when the burner 1 is in use without deforming excessively. - The material of the distribution plate 5' according to the preferred embodiment of the invention is steel, preferably steel that is resistant to high temperatures. above 900°C for example.
- In an embodiment of the invention not being part of the invention, the
passage openings 5a have the same section along the entire width of the distribution plate 5', as seen in the detail ofFigure 4 , i.e., the wall of thepassage openings 5a is a straight wall. - However, in a variant not shown in the drawings and not being part of the invention, the section of the
passage openings 5a increases along the width of the distribution plate 5' in the air exit direction. - In another variant not shown in the drawings and not being part of the invention, the section of the
passage openings 5a decreases along the width of the distribution plate 5' in the air exit direction. - These variants, like the variants described above, are also intended for favoring, according to need and to the properties of the combustible gas used, the mixing of combustible gas with air to assure the correct ignition. Likewise, it would also be possible to combine all these variants with one another, or with the preferred embodiment, for optimizing the correct mixing of combustible gas and air.
- According to the preferred embodiment of the invention, the gas distribution means comprise a main chamber 4 which is communicated with the gas inlet conduit 2 as well as with each
main conduit 4b, as seen inFigures 2 or3 . Said main chamber 4 is independent of theair chamber 5, i.e., bothchambers 4 and 5 are not communicated with one another. - In the preferred embodiment of the invention, the main chamber 4 as well as the gas inlet conduit 2 are arranged in the lower part of the burner 1, the
air chamber 5 being arranged above the main chamber 4 and theair conduit 3 being arranged above the gas conduit 2. Bothchambers 4 and 5 are separated by a separation plate 8, as shown inFigures 3, 4 or 5 . - The gas distribution means of the gas burner 1 of the invention comprise a constricted area 4a between the main chamber 4 and each
main conduit 4b. In the preferred embodiment of the invention, there is one constricted area 4a for eachmain conduit 4b such that eachmain conduit 4b is communicated with the main chamber 4 through a respective constricted area 4a, as seen inFigure 3 . Said constricted areas 4a allow regulating combustible gas head loss so that all themain conduits 4b conduct the same amount of combustible gas. - The constricted areas 4a are arranged in the lower part of the separation plate 8, one of the ends of each constricted area 4a being in contact with the main chamber 4. The corresponding
main conduits 4b are arranged in contact with the other end of each constricted area 4a, saidmain conduits 4b being housed in a corresponding housing comprised in the separation plate 8. Each housing is arranged after a corresponding constricted area 4a. - The cross-section of the
main conduits 4b is larger than the section of the constricted areas 4a, as shown inFigures 3, 4 or 5 . The speed of the combustible gas directed to the corresponding mixing point in all themain conduits 4b is therefore slowed down. - Likewise, to assure uniformity of the flames at all the mixing points, the sections and lengths of all the constricted areas 4a are the same, as well as of all the
main conduits 4b. This thereby assures that the same amount of gas reaches all the mixing points and with the same intensity, therefore, the flame generated in all the mixing points will be similar, which favors a homogenous distribution of the flames in the mixing area 7, giving rise to uniform heat distribution in said mixing area 7. - In the preferred embodiment of the invention, the main chamber 4 comprises a cross-section which gradually decreases as it moves away from the gas inlet conduit 2, as shown in
Figure 3 , resembling a triangular cross-section. The speed of the combustible gas in all the constricted areas 4a can thereby be kept equal. - As seen in the drawings, the
main conduits 4b of the distribution means are parallel to one another, saidmain conduits 4b in the preferred embodiment of the invention being arranged in a staggered manner, as shown inFigures 2 or4 . - In order to make the flames generated in the mixing area 7 even more uniform and homogeneous, the gas burner 1 according to an embodiment not being part of the invention comprises a
ceramic structure 6, preferably of silicon carbide fibers, arranged on the mixing area 7, saidceramic structure 6 being fixed preferably on the distribution plate 5'. InFigures 2 and4 , saidceramic structure 6 has been depicted in a transparent manner to favor understanding of the drawings. - The
ceramic structure 6 is a porous structure and the flames generated at each mixing point can be partially contained inside saidceramic structure 6, flame peaks that may give rise to a poor operation of the gas boiler 1 being prevented. - As a result of the
ceramic structure 6, combustible gas and air blend together so that the air-gas mixture also expands horizontally, i.e., according to a direction substantially perpendicular to the gas exit direction of the correspondingmain conduit 4b, such that a homogeneous distribution of the air-gas mixture is obtained not only in the gas exit direction of themain conduits 4b, but also in a direction perpendicular to it. Therefore, the distribution of flames obtained in the mixing area 7 will be a uniform and homogenous distribution throughout the entire burner 1, flame peaks and valleys being prevented. - In a non-limiting example of the invention, the length of the gas burner 1 is in a range between 100 mm and 200 mm, the width is in a range between 80 mm and 120 mm and the height is in a range between 25 mm and 40 mm.
- The gas burner 1 of the invention is suitable to be used in a gas boiler, preferably in a domestic boiler as a result of its small dimensions, giving rise to a safe and reliable boiler where it is assured that heat distribution throughout the entire burner 1 is homogenous, while at the same time preventing flame flashback.
Claims (4)
- Gas burner for a gas boiler, comprising a structure (1A), said structure (1A) comprising gas distribution means configured for directing combustible gas to a mixing area (7), said distribution means being communicated with a gas inlet conduit (2), and air distribution means configured for directing air to the mixing area (7), said gas distribution means being communicated with an air inlet conduit (3), the gas distribution means comprising a plurality of main conduits (4b) communicated with the gas inlet conduit (2) which are configured for transporting combustible gas to the mixing area (7), providing a mixing point at the outlet of each main conduit (4b), the air distribution means comprising an air chamber (5) communicated with the air inlet conduit (3), at least part of each main conduit (4b) being housed in said air chamber (5), said air distribution means also comprising a distribution plate (5') arranged in the mixing area (7) comprising a plurality of passage openings (5a), each passage opening (5a) being configured for directing air to at least one mixing point, the gas distribution means comprising a main chamber (4) which is communicated with the gas inlet conduit (2) and with each main conduit (4b), characterized in that the gas distribution means also comprise a constricted area (4a) between the main chamber (4) and each main conduit (4b), each main conduit (4b) being communicated with the main chamber (4) through a respective constricted area (4a).
- Gas burner according to claim 1, wherein the main conduits (4b) of the distribution means are parallel to one another.
- Gas burner according to claim 1, wherein the main conduits (4b) of the gas distribution means are arranged in a staggered manner.
- Gas boiler characterized in that it comprises at least one gas burner (1) according to any of the preceding claims.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16382614.2A EP3336427B1 (en) | 2016-12-16 | 2016-12-16 | Gas burner |
ES16382614T ES2747398T3 (en) | 2016-12-16 | 2016-12-16 | Gas burner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16382614.2A EP3336427B1 (en) | 2016-12-16 | 2016-12-16 | Gas burner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3336427A1 EP3336427A1 (en) | 2018-06-20 |
EP3336427B1 true EP3336427B1 (en) | 2019-07-03 |
Family
ID=57906402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16382614.2A Active EP3336427B1 (en) | 2016-12-16 | 2016-12-16 | Gas burner |
Country Status (2)
Country | Link |
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EP (1) | EP3336427B1 (en) |
ES (1) | ES2747398T3 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL2024101B1 (en) * | 2019-10-25 | 2021-07-19 | Bekaert Combustion Tech Bv | Surface stabilized fully premixed gas premix burner for burning hydrogen gas, and method for starting such burner |
DE102020133955A1 (en) * | 2020-12-17 | 2022-06-23 | Vaillant Gmbh | Method and device for protecting a heater when igniting a mixture of air and fuel gas containing hydrogen |
EP4253837A1 (en) | 2022-03-28 | 2023-10-04 | Orkli, S. Coop. | Gas burner |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1249366A (en) * | 1916-12-23 | 1917-12-11 | Arthur B Lewis | Gas-burning grate. |
FR639438A (en) * | 1927-01-24 | 1928-06-21 | Gas burner | |
DE4317797C1 (en) * | 1993-05-28 | 1994-12-15 | Jenaer Glaswerk Gmbh | Externally mixing burner |
DE4339012A1 (en) * | 1993-11-10 | 1995-06-08 | Witeg Mbh | Externally mixing flat face burner |
ATE198658T1 (en) * | 1994-10-06 | 2001-01-15 | Viessmann Werke Kg | GAS HEATING BOILER |
US5601073A (en) * | 1995-01-06 | 1997-02-11 | Shimek; Ronald J. | Flat pan gas burner for gas fireplaces |
DE10052614B4 (en) * | 2000-10-13 | 2006-01-26 | Alfons Krapf | External gas burner used as a melting burner or a burner for fire-polishing in the glass industry comprises a burner plate and several adjacent first outlet openings for a combustion gas and second outlet openings for oxygen or air |
JP2006056743A (en) | 2004-08-19 | 2006-03-02 | Sumitomo Electric Ind Ltd | Heating method for glass preform |
BRPI0606693B1 (en) * | 2005-01-12 | 2019-05-14 | The Babcock & Wilcox Company | STEAM GENERATION BOILER |
WO2015042613A1 (en) * | 2013-09-23 | 2015-03-26 | Christopher A. Wiklof | POROUS FLAME HOLDER FOR LOW NOx COMBUSTION |
-
2016
- 2016-12-16 ES ES16382614T patent/ES2747398T3/en active Active
- 2016-12-16 EP EP16382614.2A patent/EP3336427B1/en active Active
Non-Patent Citations (1)
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Also Published As
Publication number | Publication date |
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ES2747398T3 (en) | 2020-03-10 |
EP3336427A1 (en) | 2018-06-20 |
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