Burner device with a blocking device for blocking a flame flashback, burner system and heating device

Abstract

The invention is based on a burner device for combusting a, in particular gaseous, fuel-air mixture stream, comprising a burner plate with a plurality of third flow openings for the fuel-air mixture stream for forming and maintaining combustion flames, and a blocking device adjacent upstream of the burner plate with a plurality of first and second flow openings for the fuel-air mixture stream for blocking flashback. It is proposed that the blocking device comprise a first blocking plate and a second blocking plate adjacent downstream of the first blocking plate, wherein the first flow openings are formed in the first blocking plate and the second flow openings are formed in the second blocking plate. The first blocking plate and the second blocking plate are arranged substantially evenly spaced from one another and form a flow-through gap between them.The gap has a substantially constant clear gap height S, wherein the height S is at most 2 millimeters, preferably at most 1 millimeter, particularly preferably in the range 0.2 millimeters to 0.7 millimeters.

Description

State of the art

[0001] Burner devices for burning a gaseous fuel-air mixture stream, comprising a burner plate and a blocking device for blocking a flashback, are known from the prior art.

[0002] It is an object of the invention to provide an improved burner device. Disclosure of the invention

[0003] The invention is based on a burner device for burning a, in particular gaseous, fuel-air mixture flow, comprising a burner plate with a plurality of third flow openings for the fuel-air mixture flow for forming and maintaining flames of a combustion and a blocking device adjacent to the burner plate upstream with a plurality of first and second flow openings for the fuel-air mixture flow for blocking a flashback.

[0004] It is proposed that the blocking device comprises a first blocking plate and a second blocking plate adjacent to the first blocking plate downstream, wherein the first flow openings are formed in the first blocking plate and the second flow openings are formed in the second blocking plate. The first blocking plate and the second blocking plate are arranged at a distance from one another, in particular substantially equal, and form a gap between them through which flow can pass. The gap has a, in particular substantially constant, clear gap height S, wherein the height S is at most 2 millimeters, preferably at most 1 millimeter, particularly preferably in the range from 0.2 millimeters to 0.7 millimeters.

[0005] By means of the design according to the invention, a flashback at the burner device can be reliably prevented or made more difficult.

[0006] In this context, a burner device is understood to mean, in particular, a surface burner with a flat or curved (cylindrical or spherical) burner surface. A burner device with a cylindrical burner surface is also called a fuel rod. In this context, a burner device is understood to mean, in particular, a burner device designed for fully premixed or partially premixed combustion. In this context, a fuel-air mixture flow is understood to mean, in particular, a combustible mixture flow that arises by mixing a fuel flow with an air flow, in particular in a mixing device. A fuel is understood here to mean, in particular, a gaseous or vaporous fuel, for example a combustible gas such as natural gas, methane, propane, butane, hydrogen, or mixtures thereof.A burner plate is understood here, in particular, to be a thin-walled, flat, perforated object, for example, a sheet of metal, a foil, or a metal wire mesh. Third flow openings formed in the burner plate allow a fuel-air mixture flow to flow through the burner plate. The flow openings are, in particular, circular or slot-shaped. In particular, the entire fuel-air mixture flow intended for combustion flows through the third flow openings of the burner plate. During proper combustion operation, an (unburned) fuel-air mixture flow is supplied to the burner plate on a "cold" side of the burner plate. The fuel-air mixture flow flows through the burner plate and exits at its burner surface ("hot" side of the burner plate) into a combustion chamber, where it is ignited and burns with flame formation in a continuous combustion process.During proper combustion operation, the burner plate also serves as a flame holder to keep the flames on the hot side of the burner plate facing the combustion chamber; the flames should thus neither lift off the surface and / or extinguish, nor flash back upstream through the burner plate.

[0007] Flashback is understood here in particular as an undesirable, deviating from proper combustion operation, flashback of the flames from the combustion chamber upstream through the third flow openings to the normally cold side of the burner plate. From there, the flame can then travel further upstream through a mixture path and stabilize, for example, in the mixing device or at the air blower, causing significant damage.

[0008] A barrier device is understood here, in particular, to be a device by means of which an undesirable flame flashback is prevented and / or its harmful effects are minimized. A flame that undesirably flashes back through the burner plate cannot overcome the barrier device. The barrier device is arranged upstream of the burner plate with respect to a fuel-air mixture flow during normal combustion operation and comprises two barrier plates.

[0009] A barrier plate is understood here, in particular, to be a thin-walled, flat, perforated object, for example, a sheet of metal or a foil. The first barrier plate and the second barrier plate each have two large, in particular parallel, surfaces (as well as at least one much smaller, very narrow edge surface perpendicular thereto). Flow openings formed in a barrier plate connect one surface to the other surface of the same barrier plate in a flow-permeable manner. The flow openings allow a fuel-air mixture flow through the barrier plate. The flow openings are, in particular, circular.In particular, during proper combustion operation, the entire fuel-air mixture flow intended for combustion flows first through the first flow openings of the first blocking plate, then through the second flow openings of the second blocking plate, and finally through the third flow openings of the burner plate.

[0010] The first blocking plate and the second blocking plate are arranged adjacently, in particular in a stacked manner or as superimposed layers, and form a gap between them. In particular, the gap height S is in a range less than or equal to the extinguishing distance of the fuel-air mixture flow reaching combustion.

[0011] The fact that two plates are arranged at a substantially equal distance from one another is to be understood here in particular to mean that the vertical, clear distance between the two opposing surfaces of the two plates is, in particular, substantially constant at every point. The terms "substantially uniform" and "substantially constant" are intended here in particular to mean that an individual distance at an individual point deviates from a mean distance by at most a tolerance amount. The mean distance is obtained in particular as the arithmetic mean of the individual distances.

[0012] The fact that two plates are arranged at a distance from one another, in particular substantially, is to be understood here in particular to mean that the two plates are arranged, in particular substantially, parallel to one another.

[0013] The fact that the first locking plate and the second locking plate are arranged at a substantially uniform distance from one another is to be understood here in particular to mean that the gap height S (the clear gap dimension) between the two opposing surfaces of the first and second locking plates is, in particular, substantially constant at every point. The terms substantially uniform and substantially constant are intended here in particular to mean that an individual gap height Si deviates from an average gap height S by at most 50%, preferably at most 25%, particularly preferably at most 10%.

[0014] The flow of the fuel-air mixture through the first flow openings in the first blocking plate, then through the second flow openings in the second blocking plate ensures good protection against flashback.

[0015] By means of the two locking plates separated from each other by the gap it is achieved in particular that at least the first locking plate does not

[0016] Not only is the burner plate not exposed to heat radiation, but it is also well cooled. This cold barrier plate provides effective protection against flashback.

[0017] In an advantageous embodiment, first longitudinal axes of the first flow openings in the first blocking plate are arranged radially offset from second longitudinal axes of the second flow openings in the second blocking plate, so that the longitudinal axes of the first flow openings do not coincide with the longitudinal axes of the second flow openings.

[0018] A longitudinal axis is understood here to mean, in particular, the central axis or rotational axis of a flow opening. The term radial refers here in particular to the longitudinal axis. Radially offset here means laterally offset with respect to the longitudinal axis.

[0019] The fuel-air mixture flow is deflected twice on its path from a first flow opening in the first baffle plate to a second flow opening in the second baffle plate. The two-fold deflection of the fuel-air mixture flow and / or the flow through the narrow gap ensures good protection against flashback.

[0020] The gap height S is selected so that a flame cannot flash back through the gap. In particular, the gap height S is less than or equal to the extinguishing distance of the fuel-air mixture flow reaching combustion.

[0021] In a further advantageous embodiment, the second longitudinal axes of the second flow openings in the second blocking plate are arranged radially offset from third longitudinal axes of the third flow openings in the burner plate, so that the longitudinal axes of the second flow openings do not coincide with the longitudinal axes of the third flow openings.

[0022] The fuel-air mixture flow is deflected twice on its way from a second flow opening in the second barrier plate to a third flow opening in the burner plate. During the first deflection, the fuel-air mixture flow impacts the burner plate, particularly a section of the burner plate not perforated with third flow openings, and then flows along the burner plate, cooling the burner plate. This cooling further improves safety against flashback.

[0023] In a further advantageous embodiment, the first blocking plate and the second blocking plate, advantageously also the burner plate, are in particular substantially flat and are arranged, in particular substantially evenly spaced from one another.

[0024] The term essentially flat is to be understood here in particular to mean that at least one surface of the plate lies entirely between two imaginary parallel planes whose distance E from one another is at most 2 millimetres, preferably at most 1 millimetre, particularly preferably at most 0.5 millimetres.

[0025] The gap height S between the first blocking plate and the second blocking plate on the one hand and the height V between the second blocking plate and the burner plate are in particular of different sizes.

[0026] In a further advantageous embodiment, the first blocking plate and the second blocking plate, advantageously also the burner plate, are curved, in particular substantially cylindrical or spherical, and are arranged, in particular substantially concentrically to one another.

[0027] The term substantially cylindrical or spherical is to be understood here in particular to mean that at least one surface of the plate lies entirely between two imaginary concentric, cylindrical or spherical surfaces, the distance K between which is at most 2 millimeters, preferably at most 1 millimeter, particularly preferably at most 0.5 millimeters.

[0028] The fact that the first blocking plate and the second blocking plate and / or the burner plate are arranged substantially concentrically to one another is to be understood here in particular to mean that the aforementioned two imaginary concentric, cylindrical, or spherical surfaces have a common geometric center of curvature. The center of curvature can be a center point or a longitudinal axis.

[0029] A further advantageous embodiment has a flow-through supply chamber arranged upstream of the blocking device for supplying the fuel-air mixture flow, wherein the first flow openings in the first blocking plate open into the supply chamber.

[0030] In a further advantageous embodiment, the blocking device and the burner plate form a flow-through distribution space between them, wherein the second flow openings in the second blocking plate open into the distribution space.

[0031] In a further advantageous embodiment, the blocking device, in particular the second blocking plate of the blocking device, and the burner plate are, in particular substantially, evenly spaced from one another and form a flow-through distribution space between them, wherein the distribution space has a, in particular substantially, constant clear height V, wherein the height V is at most 5 millimeters, preferably in the range 0.5 millimeters to 4 millimeters.

[0032] During proper combustion operation, the fuel-air mixture flow is fed into the supply chamber, flows from there through the first flow openings, then through the gap between the first blocking plate and the second blocking plate, then through the second flow openings into the distribution chamber, and finally through the third flow openings into the combustion chamber. The distribution chamber also serves to evenly distribute the fuel-air mixture flow, particularly in terms of quantity, to the third flow openings. The supply chamber, the gap, and / or the distribution chamber are designed, in particular, as cavities.

[0033] In a further advantageous embodiment, images of the first flow openings projected perpendicularly onto the second blocking plate do not overlap and / or touch the second flow openings.

[0034] The projection of a first flow opening onto the second blocking plate is particularly parallel to a projection axis. The projection axis is particularly perpendicular to the projection plane, in this case the surface of the second blocking plate. The projection axis particularly coincides with the longitudinal axis of the projected flow opening or runs parallel to it.

[0035] The fuel-air mixture flow is deflected twice on its path from a first flow opening in the first baffle plate into the narrow gap and to a second flow opening in the second baffle plate, traveling a finite distance within the gap. The two deflections of the fuel-air mixture flow and the flow through the narrow gap ensure good protection against flashback.

[0036] In a further advantageous embodiment, a distance A between an image of a first hole edge of a first flow opening projected perpendicularly onto the second blocking plate and a second hole edge, in particular the nearest one, of a nearest second flow opening is greater than or equal to zero.

[0037] In a further advantageous embodiment, a distance A between an image of a first hole edge of a first through-flow opening projected perpendicularly onto the second blocking plate and a second hole edge, in particular the closest one, of a closest second through-flow opening is greater than or equal to five times, preferably greater than or equal to ten times, particularly preferably greater than or equal to twenty times, the height S of the gap.

[0038] The fuel-air mixture flow is deflected in the gap on its path from a first flow opening in the first blocking plate to a second flow opening in the second blocking plate, in particular deflected twice, and travels a considerable distance A (distance A) in the gap. The distance A in the gap is many times longer than the gap height S.

[0039] The gap height S and the distance A (distance A) in the gap can be used to design the burner device's flameback safety. The gap height S and the distance A in the gap can also have a significant impact on the pressure loss during flow through the burner device. When designing the burner device, a well-chosen compromise in the selection of gap height S and distance A can ensure both sufficiently high flameback safety and sufficiently low pressure loss in the fuel-air mixture flow.

[0040] In a further advantageous embodiment, the blocking device and the burner plate form a flow-through distribution chamber between them, with both the second flow openings in the second blocking plate and the third flow openings in the burner plate opening into the distribution chamber. Images of the second flow openings projected perpendicularly onto the burner plate do not overlap and / or touch the third flow openings.

[0041] The projection of a second flow opening onto the burner plate is particularly parallel to a projection axis. The projection axis is particularly perpendicular to the projection plane, in this case the surface of the burner plate. The projection axis particularly coincides with the longitudinal axis of the projected flow opening or runs parallel to it.

[0042] The fuel-air mixture flow is deflected twice on its way through a second flow opening in the second blocking plate into the distribution chamber and further through a third flow opening in the burner plate. During the first deflection in the distribution chamber, the fuel-air mixture flow impacts the burner plate, in particular a section of the burner plate not perforated with third flow openings, and then flows along the burner plate, cooling the burner plate. This cooling further improves safety against flashback. In particular, spontaneous ignition of the fuel-air mixture flow upstream of the burner plate is effectively suppressed.

[0043] In a further advantageous embodiment, at least one spacer, preferably a plurality of spacers, is arranged in the gap between the first locking plate and the second locking plate, which spacer defines the height S of the gap. In particular, the height S of the gap is defined by a height of the spacer.

[0044] The spacer is designed in particular not to disturb the fuel-air mixture flow in the gap or at most to disturb it only slightly.

[0045] The spacer ensures that the gap height S is permanently maintained, especially under changing operating conditions, for example changing temperatures, but also in the event of vibrations, for example during transport or undesired hard (late) ignition of the fuel-air mixture flow.

[0046] In a further advantageous embodiment, the at least one spacer is formed from the first locking plate and / or the second locking plate, in particular in the form of a nub. The spacer is arranged on a side of the first locking plate and / or the second locking plate facing the gap.

[0047] The spacer is, in particular, firmly bonded to at least one of the two locking plates. Such a nub is created, in particular, by means of local plastic forming.

[0048] In a further advantageous embodiment, the first blocking plate and the second blocking plate, advantageously also the burner plate, are held at their edges by means of a support structure, wherein the at least one spacer is formed in the support structure and projects into the gap between the first blocking plate and the second blocking plate.

[0049] The support structure can be designed, in particular, as a frame, flange, and / or cover of the burner device. The support structure can, in particular, also represent a guide structure for the directed flow of the fuel-air mixture stream through the burner device. The support structure can, in particular, also have a sealing function to prevent the fuel-air mixture stream from unintentionally escaping at locations on the burner device that are unsuitable for this purpose. In particular, at least one spacer can also be formed in the support structure, which protrudes into the gap between the second blocking plate and the burner plate.

[0050] In a further advantageous embodiment, the burner device is designed to burn a fuel-air mixture stream containing hydrogen, wherein the fuel contains hydrogen or is hydrogen.

[0051] Hydrogen as a fuel or fuel blend offers many advantages, including lower emissions. Hydrogen burns with specific properties that must be considered in the design, particularly through appropriate flow cross-section dimensions.

[0052] The invention also relates to a burner system for generating combustion heat by burning a gaseous fuel-air mixture stream, comprising an air supply device, in particular with an air blower, for supplying and / or conveying an air stream, a fuel supply device with a fuel valve device for supplying and / or metering a fuel stream, and a mixing device for generating the fuel-air mixture stream by mixing the air stream with the fuel stream. The burner system further comprises a burner device as described above.

[0053] Furthermore, the burner system can comprise an ignition device for igniting combustion of the fuel-air mixture stream at the burner device and / or at least one monitoring device for monitoring flame formation and / or combustion quality. Furthermore, the burner system can comprise at least one control device or regulating device configured to communicate with the air blower and / or the fuel valve device and / or the ignition device and / or the monitoring device in order to control and / or regulate the burner system and / or its components.

[0054] In this context, a burner system is to be understood in particular as a system for generating heat by supplying and / or conveying an air flow, supplying and / or metering a fuel flow, generating a fuel-air mixture flow, igniting and burning the fuel-air mixture flow, monitoring flame formation and / or combustion quality, and controlling and / or regulating the burner system and / or its components.

[0055] The burner system is designed specifically for fully premixed or partially premixed combustion.

[0056] The invention also relates to a heating device for providing heat, in particular for heating a working fluid, by burning a gaseous fuel-air mixture stream, comprising a heat exchanger for transferring combustion heat to the working fluid. The heating device further comprises a burner system as described above for generating combustion heat with a burner device as described above. Furthermore, the heat can also be provided by means of radiation generated by the heating device. A working fluid is understood here to mean, in particular, heating water and / or drinking water and / or hot air. drawing

[0057] Further embodiments and advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will conveniently consider the features individually and combine them into useful further combinations. The following schematically show: Figure 1a burner device with a flat burner plate and a flat locking device, Figure 2a burner device with a curved burner plate and a curved locking device.

[0058] Figure 1a shows a longitudinal section through a burner device 100 with a flat burner plate 110, a flat locking device 200 and a support structure 120. Figure 1b shows a perspective exploded view of the burner device 100 from Figure 1awith the flat burner plate 110 and the locking device 200, which comprises a first flat locking plate 210 and a second flat locking plate 220 (without support structure). Figure 1c shows a detail of the Figure 1b . In Figure 1 the first blocking plate 210, the second blocking plate 220 and the burner plate 110 are arranged in a stack or as superimposed layers.

[0059] Figure 2a shows a longitudinal section through a burner device 100 with curved (cylindrical) burner plate 110, curved (cylindrical) locking device 200 and support structure 120 (front flange and front cover). Figure 2b shows a perspective exploded view of the burner device 100 from Figure 2a with the curved (cylindrical) burner plate 110 and the locking device 200, which comprises a first curved (cylindrical) locking plate 210 and a second curved (cylindrical) locking plate 220. Figure 2cshows a detail of the Figure 2b . In Figure 2 the first blocking plate 210, the second blocking plate 220 and the burner plate 110 are arranged concentrically to each other.

[0060] The burner device 100 has a burner plate 110 with a plurality of third flow openings 112 (slot-shaped or circular) for the flow of a fuel-air mixture flow M. The burner plate 110 faces a combustion chamber 30 downstream of the mixture flow M. Flames F of a combustion process can be ignited at the third flow openings 112. A blocking device 200 is arranged upstream of the burner plate 110 and is designed to block unwanted flashback against the mixture flow M.

[0061] The blocking device 200 comprises a first blocking plate 210 with first flow openings 212 formed therein for the fuel-air mixture flow M to flow through, and a second blocking plate 220 adjacent to the first blocking plate 210 downstream and with second flow openings 222 formed therein. The first blocking plate 210 and the second blocking plate 220 are arranged at equal distances from one another and form a flow-through gap 230 between them. The gap 230 has a constant clear gap height S, wherein the gap height S is at most 1.2 millimeters and preferably lies in the range of 0.2 millimeters to 0.7 millimeters.

[0062] At least one spacer 232, preferably a plurality of spacers 232, is arranged in the gap 230 between the first locking plate 210 and the second locking plate 220. The spacer 232 or the plurality of spacers 232 defines the height S of the gap.

[0063] Arranged upstream of the blocking device 200 is a supply chamber 10 for supplying the fuel-air mixture flow M to the burner device 100. The first flow openings 212 in the first blocking plate 210 open upstream into the supply chamber 10 and downstream into the gap 230. The second flow openings 222 in the second blocking plate 220 open upstream into the gap 230 and downstream into the distribution chamber 20. The distribution chamber 20 for distributing the fuel-air mixture flow M to the third flow openings 112 in the burner plate 110 is formed between the blocking device 200 and the burner plate 110. The blocking device 200 and the burner plate 110 are evenly spaced from one another. The distribution space 20 has a constant clear height V, wherein the height V is at most 5 millimeters and preferably lies in the range of 2 millimeters to 4 millimeters.The third flow openings 112 in the burner plate 110 open upstream into the distribution chamber 20 and downstream into the combustion chamber 30 arranged downstream of the burner plate 110.

[0064] Figure 1a shows that the first blocking plate 210, the second blocking plate 220, and the burner plate 110 are held at their edges by a support structure 120, with bead-like spacers 232 formed in the support structure 120 and projecting into the gap 230 between the first blocking plate 210 and the second blocking plate 220. Further bead-like spacers 232 formed in the support structure 120 project into the distribution space 20 between the second blocking plate 220 and the burner plate 110 and define the height V of the distribution space 20.

[0065] The Figure 1a and 1b further show spacers 232 formed in a knob-like manner from the first locking plate 210.

[0066] The first flow openings 212 in the first blocking plate 210 have first longitudinal axes 214. Likewise, the second flow openings 222 in the second blocking plate 220 have second longitudinal axes 224. The first longitudinal axes 214 and second longitudinal axes 224 are advantageously arranged radially offset from one another by a distance R, so that the first longitudinal axes 214 of the first flow openings 212 do not coincide with the second longitudinal axes 224 of the second flow openings 222.

[0067] If, as in Figure 1c, the first flow openings 212 are projected perpendicularly onto the second blocking plate 220, projected images 216 (shown here in dashed lines) of the first flow openings 212 are obtained. These images 216 do not overlap and / or touch the second flow openings 222.

[0068] If you project, as in Figure 2c, the first flow openings 212 are perpendicular to the second blocking plate 220, projected images 216 (shown here in dashed lines) of the first flow openings 212 are produced there. These images 216 do not overlap and / or touch the second flow openings 222.

[0069] If, as in Figure 1c, the first flow openings 212 are projected perpendicularly onto the second blocking plate 220, projected images (shown here in dashed lines) of the hole edges of the first flow openings 212 are obtained. A distance A between an image of a first hole edge of a first flow opening 212 projected perpendicularly onto the second blocking plate 220 and a second hole edge of a nearest second flow opening 222 is greater than or equal to ten times, preferably greater than or equal to fifteen times, particularly preferably greater than or equal to twenty times, the height S of the gap 230.

[0070] If you project, as in Figure 2c , the first flow openings 212 perpendicular to the second blocking plate 220, projected images (shown here in dashed lines) of the hole edges of the first flow openings 212 are produced there. A distance A between an image of a first hole edge of a first flow opening 212 projected perpendicularly onto the second blocking plate 220 and a second hole edge of a nearest second flow opening 222 is greater than or equal to ten times, preferably greater than or equal to fifteen times, particularly preferably greater than or equal to twenty times, the height S of the gap 230.

Claims

1. Burner device (100) for burning a fuel-air mixture flow (M), comprising • a burner plate (110) with a plurality of third flow openings (112) for the fuel-air mixture flow (M) for forming and maintaining flames (F) of a combustion, • a blocking device (200) adjacent to the burner plate (110) upstream with a plurality of first and second flow openings (212, 222) for the fuel-air mixture flow (M) for blocking a flashback, characterized by • that the locking device (200) comprises a first locking plate (210) and a second locking plate (220) adjacent to the first locking plate (210) downstream, • that the first flow openings (212) are formed in the first blocking plate (210) and the second flow openings (222) are formed in the second blocking plate (220), • thatthe first blocking plate (210) and the second blocking plate (220) are arranged, in particular substantially, evenly spaced from one another and form a flow-through gap (230) between them, wherein the gap (230) has a, in particular substantially, constant clear gap height (S), • that the gap height (S) is at most 2 millimeters, preferably at most 1 millimeter, and particularly preferably in the range 0.2 millimeters to 0.7 millimeters.

2. Burner device (100) according to claim 1, wherein first longitudinal axes (214) of the first flow openings (212) are arranged radially offset by a distance (R) from second longitudinal axes (224) of the second flow openings (222), so that the first longitudinal axes (214) of the first flow openings (212) do not coincide with the second longitudinal axes (224) of the second flow openings (222).

3. Burner device (100) according to claim 1 or 2, wherein the first blocking plate (210) and the second blocking plate (220), advantageously also the burner plate (110), are in particular substantially planar and are arranged, in particular substantially evenly spaced from one another.

4. Burner device (100) according to claim 1 or 2, wherein the first blocking plate (210) and the second blocking plate (220), advantageously also the burner plate (110), are curved, in particular substantially cylindrical or spherical, and are arranged, in particular substantially concentrically to one another.

5. Burner device (100) according to one of the preceding claims, characterized by a flow-through feed chamber (10) arranged upstream of the blocking device (200) for supplying the fuel-air mixture flow (M), wherein the first flow openings (212) in the first blocking plate (210) open into the feed chamber (10).

6. Burner device (100) according to one of the preceding claims, characterized in that the blocking device (200) and the burner plate (110) form a flow-through distribution space (20) between them, wherein the second flow openings (222) in the second blocking plate (220) open into the distribution space (20).

7. Burner device (100) according to one of the preceding claims, characterized in that the blocking device (200) and the burner plate (110) are, in particular substantially, evenly spaced from one another and form a flow-through distribution space (20) between them, wherein the distribution space (20) has a, in particular substantially, constant clear height (V), wherein the height (V) is in particular at most 5 millimeters, preferably in the range 0.5 millimeters to 4 millimeters.

8. Burner device (100) according to one of the preceding claims, wherein images (216) of the first flow openings (212) projected perpendicularly onto the second blocking plate (220) do not overlap and / or do not touch the second flow openings (222).

9. Burner device (100) according to one of the preceding claims, wherein a distance (A) between an image of a first hole edge of a first flow-through opening (212) projected perpendicularly onto the second blocking plate (220) and a second hole edge of a nearest second flow-through opening (222) is greater than or equal to five times, preferably greater than or equal to ten times, particularly preferably greater than or equal to twenty times, the height (S) of the gap.

10. Burner device (100) according to one of the preceding claims, characterized in thatthe blocking device (200) and the burner plate (110) form a flow-through distribution space (20) between them, wherein the second flow openings (222) in the second blocking plate (220) open into the distribution space (20), and wherein the third flow openings (112) in the burner plate (110) open into the distribution space (20), wherein images of the second flow openings (222) projected perpendicularly onto the burner plate (110) do not overlap and / or do not touch the third flow openings (112).

11. Burner device (100) according to one of the preceding claims, wherein at least one spacer (232), preferably a plurality of spacers (232), is arranged in the gap (230) between the first blocking plate (210) and the second blocking plate (220), which spacer defines the height (S) of the gap (230).

12. Burner device (100) according to claim 11, wherein the at least one spacer (232) is formed from the first blocking plate (210) and / or the second blocking plate (220), in particular in the form of a knob.

13. Burner device (100) according to claim 11 or 12, wherein the first locking plate (210) and the second locking plate (220), advantageously also the burner plate (110), are held at their edges by means of a support structure (120), wherein the at least one spacer (232) is formed in the support structure (120) and projects into the gap (230) between the first locking plate (210) and the second locking plate (220).

14. Burner device (100) according to one of the preceding claims, characterized in that the burner device (100) is designed to burn a fuel-air mixture stream (M) containing hydrogen, wherein the fuel contains hydrogen or is hydrogen.

15. Burner systemfor generating combustion heat by burning a gaseous fuel-air mixture stream (M), comprising an air supply device, in particular with an air blower, for supplying an air stream, a fuel supply device with a fuel valve device for supplying a fuel stream, a mixing device for generating the fuel-air mixture stream (M) by mixing the air stream with the fuel stream, characterized by a burner device (100) according to one of claims 1 to 14.

16. heater for providing heat, in particular for heating a useful fluid, by burning a gaseous fuel-air mixture stream (M), comprising a heat exchanger for transferring combustion heat to the useful fluid, characterized by a burner system for generating combustion heat according to claim 15.

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