EP4092321A1 - Hydrogen gas burner apparatus - Google Patents

Abstract

The present invention relates to a hydrogen gas burner device (1), comprising an elongate, tubular housing (2) extending in an axial direction (A) with an outer housing shell (3), a housing (2) formed inside, Combustion chamber (5) extending in the axial direction (A) and delimited on the outside by the housing shell (3), at least one burner nozzle (6) which is designed to inject a hydrogen-oxygen mixture into the combustion chamber (5) burning flame, and an exhaust gas duct (7) formed inside the housing (2), extending in the axial direction (A), fluidly connected to the combustion chamber (5) and into which the exhaust gas coming from the combustion chamber (5) is introduced , characterized in that an end face of the housing (2) is completely closed by an end-side housing wall (4), that the combustion chamber (5) and the exhaust gas duct (7) in a direction transverse, in particular lower are arranged adjacent to one another right to the axial direction (A), and that a partition (8) extending in the axial direction (A) is provided, which separates the combustion chamber (5) and the exhaust gas duct (7) from one another in certain areas. It is also proposed to use such a device (1) as a heating element of a heat exchanger, which in particular forms part of a waste heat boiler.

Description

The present invention relates to a hydrogen gas burner device, comprising an elongate, tubular housing, extending in an axial direction, with an outer housing shell, a combustion chamber formed inside the housing, extending in the axial direction and delimited to the outside by the housing shell, at least a burner nozzle adapted to burn a hydrogen-oxygen mixture to produce a flame burning in the combustion chamber, and an exhaust gas passage formed inside the housing, extending in the axial direction and fluidly connected to the combustion chamber, into which the exhaust gas from the Combustion chamber coming exhaust gas is introduced.

Gas burner devices of the type mentioned are known in principle in the prior art. They use hydrogen as fuel, which is a great advantage in that neither carbon monoxide nor carbon dioxide are released during combustion. The exhaust gas generated in the combustor can then be used to heat circulating water in a cycle. For this purpose, the exhaust gas is fed to a heat exchanger in which it flows around water-carrying pipes and gives off heat to the water. The cooled exhaust gas is then released into the environment. Such a hydrogen gas burner device is, for example, in the reference DE 10 2004 012 988 A1 disclosed.

In the case of new designs, such hydrogen gas burner devices have basically proven their worth. A problem comes, however come into play when, for example, the natural gas or oil burner of an existing system is to be replaced by a hydrogen gas burner device, since existing systems, such as existing boiler systems of building heating systems or the like, are usually not suitable for the exhaust gas with a high water vapor content from hydrogen gas burner devices and that from this condensed water are designed. This means that a fuel change from gas or oil to hydrogen is usually associated with a large conversion effort and correspondingly high costs.

Proceeding from this state of the art, it is an object of the present invention to create a hydrogen gas burner device of the type mentioned at the beginning with an alternative structure.

To solve this problem, the present invention creates a hydrogen gas burner device of the type mentioned at the outset, which is characterized in that one end face of the housing is completely closed by an end face housing wall, that the combustion chamber and the exhaust gas duct run in a direction transverse, in particular perpendicular, to the axial Direction are arranged adjacent to each other, and that a partition wall extending in the axial direction is provided, which partially separates the combustion chamber and the exhaust gas duct from one another.

During the operation of the hydrogen gas burner device according to the invention, the at least one burner nozzle is supplied with hydrogen and oxygen, in particular in the form of ambient air. For this purpose, corresponding feeds are provided in the region of that free end of the housing which is opposite the completely closed end. The fuel-oxygen mixture is ignited at the burner nozzle. The exhaust gas produced in the combustion chamber gives off heat to the area of the housing shell that delimits the combustion chamber and is then discharged through the exhaust duct. Since the exhaust gas duct does not adjoin the combustion chamber in the axial direction, but is arranged according to the invention in a direction transverse to the axial direction adjacent to the combustion chamber, the exhaust gas is routed via the exhaust gas duct to that free end area of the housing from which hydrogen and oxygen the housing are introduced, and there discharged from the housing. The opposite front end of the housing is completely closed. Correspondingly, the housing forms a heating element, which emits heat to the environment at least via the area of the housing shell that delimits the combustion chamber on the outside.

An essential advantage of the hydrogen gas burner device according to the invention is that the exhaust gas, which contains a lot of water vapor, can be prevented from reaching the environment that is heated via the housing. For example, oil or natural gas burners of existing boilers can be replaced by hydrogen gas burner devices according to the invention without major and costly conversion measures. This makes the hydrogen gas burner device according to the invention very flexible to use.

Preferably, the thermal conductivity of that material from which the region of the housing jacket that outwardly delimits the combustion chamber is made is higher than the thermal conductivity of that material from which the partition wall is made, advantageously significantly higher. The heat output naturally increases with the level of thermal conductivity of the housing jacket. On the other hand, the thermal conductivity of the partition wall should be as low as possible in most designs of the hydrogen gas burner device according to the invention in order to prevent the already cooled exhaust gas flowing through the exhaust gas duct from being reheated by the hotter exhaust gas flowing through the combustion chamber, which would reduce the heating capacity of the device would decrease. A suitable material for the housing jacket is metallic material, in particular one with a thermal conductivity λ≧120 W/Km, better still ≧150 W/Km, such as tungsten or the like. A suitable material for the partition is non-metallic material, in particular one with a thermal conductivity λ≦2 W/Km, better still ≦1 W/Km, such as enamel or the like.

According to one embodiment of the present invention, the combustion chamber surrounds the exhaust gas channel in a ring shape and the partition wall is of tubular design. This design is advantageous in that heat is emitted over the entirety of the housing jacket, which optimizes the heating output.

The dividing wall advantageously ends at a predetermined distance in front of the end-side housing wall, as a result of which a transition between the combustion chamber and the exhaust gas duct is created in a simple design.

The tubular partition can alternatively or additionally have at least one opening, in particular on its underside, through which exhaust gas from the combustion chamber is introduced into the exhaust gas duct during operation.

According to a further embodiment of the present invention, the dividing wall is flat, the dividing wall ending in particular at a predetermined distance in front of the end-side housing wall, whereby an opening is formed through which exhaust gas from the combustion chamber is introduced into the exhaust gas duct during operation. This leads to a very simple construction.

Advantageously, the thickness of the housing jacket delimiting the combustion chamber tapers in the direction of flow through the combustion chamber, in particular continuously. This type of construction is ideal when the temperature within the combustion chamber decreases in the flow direction and the heat dissipation that is as uniform as possible via the housing jacket is desired.

According to one embodiment of the present invention, the combustion chamber has at least one gas-permeable wall that extends transversely to the axial direction over the entire cross-section of the combustion chamber, the gas-permeable wall being designed in particular as a membrane, grid or perforated plate. Such a gas-permeable wall represents an obstacle for the exhaust gas flowing through the combustion chamber, whereby the dwell time of the exhaust gas in the combustion chamber is extended and the heat transfer from the exhaust gas to the area of the housing shell delimiting the combustion chamber is improved.

The gas-permeable wall preferably has a convex curvature in relation to the direction of flow through the combustion chamber, in particular the wall positioned furthest upstream if a plurality of walls are provided. The convex curvature causes parts of the exhaust gas to be recirculated, which means that the proportion of nitrogen oxides (NOx) in the exhaust gas leaving the housing can be reduced.

Exhaust gas recirculation openings are preferably provided in the partition wall, through which part of the exhaust gas flowing through the exhaust gas duct is routed back into the combustion chamber, which is also beneficial for reducing nitrogen oxides.

In the combustion chamber, in particular in the rear area of the combustion chamber viewed in the direction of flow, it is advantageous for the exhaust gas to flowable, provided with the combustion chamber delimiting housing jacket connected heat transfer structures that extract heat from the exhaust gas and transfer it to the housing jacket, whereby the heating output is improved.

According to one embodiment of the present invention, the at least one burner nozzle is arranged on that end face of the housing which is opposite the end face closed by the end face housing wall.

According to an alternative embodiment of the present invention, a multiplicity of burner nozzles are provided, which are arranged at a distance from one another in the axial direction within the combustion chamber and, in particular, are distributed uniformly in such a way that their flames burn into the combustion chamber.

The combustion chamber is preferably provided with at least one condensate outlet opening, via which condensate that forms inside the combustion chamber can be discharged.

According to one embodiment of the present invention, the at least one condensate outlet opening is formed in the partition wall or in the housing shell at the downstream end of the exhaust gas duct. Correspondingly, condensate arising in the combustion chamber is routed through the at least one condensate outlet opening into the exhaust gas duct and discharged via the exhaust gas duct.

It is also proposed to use a device according to the invention as a heating element of a heat exchanger, the heat exchanger forming in particular part of a waste heat boiler.

• Figur 1 eine schematische Längsschnittansicht einer Wasserstoff-Gasbrennervorrichtung gemäß einer ersten Ausführungsform der vorliegenden Erfindung;
• Figur 2 eine schematische Längsschnittansicht einer Wasserstoff-Gasbrennervorrichtung gemäß einer zweiten Ausführungsform der vorliegenden Erfindung;
• Figur 3 eine schematische Längsschnittansicht einer Wasserstoff-Gasbrennervorrichtung gemäß einer dritten Ausführungsform der vorliegenden Erfindung;
• Figur 4 eine schematische Längsschnittansicht einer Wasserstoff-Gasbrennervorrichtung gemäß einer vierten Ausführungsform der vorliegenden Erfindung;
• Figur 5 eine schematische Schnittansicht entlang der Linie V-V in Figur 4 und
• Figur 6 eine schematische Längsschnittansicht einer Wasserstoff-Gasbrennervorrichtung gemäß einer fünften Ausführungsform der vorliegenden Erfindung.

Other features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings. inside is

• figure 1 12 is a schematic longitudinal sectional view of a hydrogen gas burner device according to a first embodiment of the present invention;
• figure 2 12 is a schematic longitudinal sectional view of a hydrogen gas burner device according to a second embodiment of the present invention;
• figure 3 12 is a schematic longitudinal sectional view of a hydrogen gas burner device according to a third embodiment of the present invention;
• figure 4 12 is a schematic longitudinal sectional view of a hydrogen gas burner device according to a fourth embodiment of the present invention;
• figure 5 a schematic sectional view along the line VV in figure 4 and
• figure 6 12 is a schematic longitudinal sectional view of a hydrogen gas burner device according to a fifth embodiment of the present invention.

In the following, the same reference numerals refer to the same or similar components or component areas.

figure 1 12 shows a hydrogen gas burner device 1 according to a first embodiment of the present invention. This comprises an elongate, tubular housing 2 extending in an axial direction A, which has an outer housing casing 3 and is completely closed at one end by an end-side housing wall 4 . Furthermore, the hydrogen gas burner device 1 comprises a combustion chamber 5 formed in the interior of the housing 2, extending in the axial direction A and delimited to the outside by the housing jacket 3 and a plurality of burner nozzles 6, presently arranged in a ring shape, which are designed to produce a hydrogen-oxygen Mixture to burn to produce a burning in the combustion chamber 5 flame. In addition, inside the housing 2 there is an exhaust gas channel 7 which extends in the axial direction A and is fluidly connected to the combustion chamber 5, into which the exhaust gas coming from the combustion chamber 5 is introduced. The combustion chamber 5 and the exhaust gas duct 7 are arranged adjacent to one another in a direction transverse, in this case perpendicular to the axial direction A, and are separated from one another in regions by a partition wall 8 extending in the axial direction A. The partition 8 is tubular in this case, positioned centrally within the housing 2 and ends at a distance a in front of the front housing wall 4. The interior of the tubular partition 8 forms the exhaust gas duct 7, the combustion chamber 5 surrounds this ring. The thickness d of the housing jacket 3 delimiting the combustion chamber 5 tapers steadily in the direction of flow through the combustion chamber 5 until it reaches the end-side housing wall 4, although this does not necessarily have to be the case. In the present case, a plurality of gas-permeable walls 9 are arranged at a distance from one another in the combustion chamber 5 along the axial direction A. The housing shell 3 can on its inside and/or be provided with structures 10 at least in regions on its outside, which increase the outside and/or the inside surface of the housing shell 3 compared to a flat surface. In figure 1 rib-like structures 10 arranged on the outer surface of the housing jacket 3 are shown. Alternatively or additionally, the inner and/or outer surface of the housing jacket 3 can also be porous. It is also possible to dispense with such structures 10 entirely. In the region of that free end at which the burner nozzles 6 are also positioned, the housing 2 is provided with an outwardly projecting annular flange 12 which is circumferentially provided with a thread 11 and which projects radially outwards over the structures 10 . Viewed in longitudinal section, the inner surface of the housing shell 3 is preferably at least slightly inclined at an angle α relative to the horizontal 13 in the lower region, with a condensate outlet opening 14 preferably being formed in the housing shell 3 in the region of the lowest point of the slope. Exhaust gas recirculation openings 15 are advantageously provided in the partition wall 8 in the region of the downstream end, through which a part of the exhaust gas flowing through the exhaust gas duct 7 is routed back into the combustion chamber 5 . Furthermore, the partition wall 8 can have condensate outlet openings 14 which are arranged in such a way that condensate occurring in the combustion chamber 5 is discharged into the exhaust gas duct 7 through these.

During operation of the device 1 , hydrogen and oxygen are supplied to the burner nozzles 6 and ignited in the area of the outlet opening of the burner nozzles 6 , forming a flame which burns into the combustion chamber 5 . The hydrogen supply is in figure 1 indicated by arrows 16 and the oxygen supply by arrows 17. The exhaust gas produced by the combustion flows through the combustion chamber 5 in the direction of the arrows 18, the flow rate being reduced by the gas-permeable walls 9 through which the exhaust gas must pass. While As it flows through the combustion chamber 5 , the exhaust gas gives off heat to the housing shell 3 . The heat dissipation is promoted by the structures 10 . A uniform heat dissipation via the housing jacket 3 in the axial direction A is realized by the steadily decreasing thickness d of the housing jacket 3 . Shortly before the front housing wall 4, the exhaust gas is introduced into the exhaust gas duct 7, as indicated by the arrow 19, and then flows through the exhaust gas duct 7 in the direction of the arrow 20. Parts of the exhaust gas are fed back into the combustion chamber 5 through the exhaust gas recirculation openings 15 to reduce nitrogen oxide formation. The remaining exhaust gas is discharged from the exhaust gas duct 7 in the direction of the arrow 21 . Condensate arising within the combustion chamber 5 or the exhaust gas duct 7 is discharged from the housing 2 via the condensate outlet opening 14 and can then be collected.

In the figure 1 The hydrogen gas burner device 1 shown forms a heating element, the housing jacket 3 of which absorbs heat from the exhaust gas flowing through the combustion chamber 5 and then releases it to the environment 22 . For this purpose, it is expedient to manufacture at least the region of the housing 2 that delimits the combustion chamber 5 from a material with the highest possible thermal conductivity, for example from a metallic material that in particular has a thermal conductivity λ ≥ 120 W/Km, better still ≥ 150 W/Km , such as tungsten or the like. In order to prevent the already cooled exhaust gas flowing through the exhaust gas duct 7 from being heated again in counterflow by the exhaust gas flowing through the combustion chamber 5, the partition wall 8 is preferably made of a material with very low thermal conductivity, for example non-metallic material, which in particular has a thermal conductivity λ ≤ 2 W/Km, better still ≤ 1 W/Km, such as enamel or the like. The hydrogen gas burner device 1 can, for example, be inserted into a through-opening provided with an internal thread that matches the thread 11 of a heat exchanger in the manner of a cartridge with the end-side housing wall 4 in front and then fastened by screws. The heat exchanger can be, for example, a boiler of a domestic heating system that has previously been fired with gas burners or oil burners.

figure 2 12 shows a hydrogen gas burner device 1 according to a second embodiment of the present invention. This includes a housing 2, which is essentially analogous to that in figure 1 housing 2 shown is formed. Deviating from this, the in figure 2 however, the housing 2 shown has no outwardly protruding structures 10. The hydrogen gas burner device 1 comprises a partition wall 8 which is planar, in the present case extends horizontally and ends at a predetermined distance a in front of the end-side housing wall 4 . Through this partition 8, which preferably extends approximately centrally through the housing 2, the interior of the housing 2 is based on figure 2 a combustion chamber 5 is formed above the partition wall 8 and an exhaust gas channel 7 is formed below the partition wall 8 , which are connected to one another just before the end-side housing wall 4 . At the upstream end of the combustor 5, a single burner nozzle 6 is provided. However, it should be clear that several burner nozzles 6 can also be positioned there. Furthermore, a gas-permeable wall 9 is positioned inside the combustion chamber 5, which extends transversely to the axial direction A over the entire cross section of the combustion chamber 5 and, analogously to the previously described embodiment, is preferably embodied as membrane-like, grid-like or as a lock plate. The gas-permeable wall 9 has a convex curvature in relation to the flow direction 18 of the combustion chamber. In the present case, heat transfer structures through which the exhaust gas can flow and which are connected to the housing jacket 3 are provided in the downstream area of the combustion chamber 5 .

During the operation of the in figure 2 In the device 1 shown, hydrogen and oxygen are supplied to the burner nozzle 6 and ignited in the area of the outlet opening of the burner nozzle 6 to form a flame which burns into the combustion chamber 5 . The supply of hydrogen is indicated here by the arrow 16 and the supply of oxygen by the arrow 17. The exhaust gas produced by the combustion flows through the combustion chamber 5 in the direction of the arrow 18, the flow velocity through the gas-permeable wall 9, which the exhaust gas has to pass, is reduced. Due to the convex curvature of the gas-permeable wall 9, parts of the exhaust gas are guided back in the direction of the burner nozzle 6 in order to reduce the formation of nitrogen oxide. Furthermore, the exhaust gas flowing through the combustion chamber 5 passes through the heat transfer structures 23 and is then introduced into the exhaust gas duct 7 in the direction of the arrow 19 . As the exhaust gas flows through the combustion chamber 5 , it gives off heat to the housing shell 3 . This heat dissipation is supported in the downstream area of the combustion chamber 5 by the heat transfer structures 23 . The cooled exhaust gas flows through the exhaust gas duct 7 in the direction of the arrow 20 and is then discharged from the housing 2 in the direction of the arrow 21 . Condensate arising within the combustion chamber 5 or the exhaust gas duct 7 is discharged from the housing 2 via the condensate outlet opening 14 and can then be collected.

Also the in figure 2 The hydrogen gas burner device 1 shown forms a heating element, the housing jacket 3 of which absorbs heat from the exhaust gas flowing through the combustion chamber 5 and then releases it to the environment 22 . Here, too, it is expedient to manufacture both the housing 2 and the heat transfer structures 23 from a material with the highest possible thermal conductivity. The partition wall 8 should be made of a material with low thermal conductivity in order to reheat the already cooled exhaust gas flowing through the exhaust gas duct 7 avoid. With regard to the preferred materials, reference is made to the comments on the first embodiment.

figure 3 shows a hydrogen gas burner device 1 according to a third embodiment of the present invention, in which the housing 2 and the partition wall 8 and thus also the combustion chamber 5 and the exhaust gas channel 7 analogously to FIG figure 2 embodiment shown are formed. A difference from the embodiment described above is that instead of the heat transfer structures 23 in the downstream area of the combustion chamber 5 , a guide structure 24 is provided, which meanders the exhaust gas through the downstream part of the combustion chamber 5 . In addition, in the region of the downstream end of the exhaust gas duct 7 there is a preferably water-carrying line 25 which protrudes into the latter and forms part of an external heat exchanger system which is not shown in detail.

During the operation of the in figure 3 Device 1 shown are hydrogen and oxygen supplied in the direction of arrows 16 and 17 and ignited in the area of the outlet opening of the burner nozzle 6 to form a flame that burns in the combustion chamber 5. The exhaust gas resulting from the combustion flows through the combustion chamber 5 in the direction of the arrow 18 and then passes through the meandering guide structure 24. While flowing through the combustion chamber 5, the exhaust gas gives off heat to the housing jacket 3, which then conducts the absorbed heat on to the environment 22 . Thanks to the meandering guide structure 24, the dwell time of the exhaust gas within the combustion chamber 5 and thus also the heat transfer to the housing shell 3 is improved. It should be clear that the guide structure 24 can also have a shape other than a meandering shape. The exhaust gas flows from the combustion chamber 5 in the direction of the arrow 19 into the exhaust gas duct 7 and is there in the direction of the arrow 20 to the downstream end directed. There the exhaust gas, which has already cooled down, then gives off heat to the medium of the external heat exchanger flowing through the line 25 in the direction of the arrows 26 and 27 before it leaves the exhaust gas duct 7 in the direction of the arrow 21 . Condensate arising within the combustion chamber 5 or the exhaust gas duct 7 is discharged from the housing 2 via the condensate outlet opening 14 and can then be collected.

In the figure 3 The hydrogen gas burner device 1 shown forms a heating element, the housing jacket 3 of which absorbs heat from the exhaust gas flowing through the combustion chamber 5 and then releases it to the environment 22 . It is expedient to manufacture both the housing 2 and the conductive structure 24 from a material with the highest possible thermal conductivity. The partition wall 8 should be made of a material with low thermal conductivity in order to prevent the already cooled exhaust gas flowing through the exhaust gas channel 7 from being reheated by the hot exhaust gas flowing through the combustion chamber 5 . With regard to the preferred materials, reference is made to the comments on the first embodiment.

the figures 4 and 5 12 show a hydrogen gas burner device 1 according to a fourth embodiment of the present invention. This comprises an elongate, tubular housing 2 extending in an axial direction A, which has an outer housing casing 3 and is completely closed at one end by an end-side housing wall 4 . The housing 2 is provided with a condensate outlet opening 14 analogously to the previously described embodiments. Furthermore, the hydrogen gas combustion device 1 comprises a combustion chamber 5 formed inside the housing 2, extending in the axial direction A and delimited to the outside by the housing jacket 3, and an exhaust gas channel 7, which extends in the axial direction A and is fluidly connected to the combustion chamber 5. The combustion chamber 5 and the exhaust duct 7 are in one direction arranged transversely, in this case perpendicular to the axial direction A, adjacent to one another and separated from one another in regions by a tubular partition 8 extending in the axial direction A, the partition 8 extending through the entire housing 2 up to the end-side housing wall 4. The hydrogen gas combustion device 1 is provided with a plurality of burner nozzles 6 positioned along the circumference of the partition wall 8 and preferably equally spaced from one another in the axial direction A within the combustion chamber 5 , the flames of which burn substantially radially into the combustion chamber 5 . The burner nozzles 6 are supplied with fuel and oxygen via supply lines 28 which extend axially through the partition wall 8 and are fluidly connected to the burner nozzles 6 . The fluidic connection between the combustion chamber 5 and the exhaust gas duct 7 is implemented here by a slot-like opening 29 which is formed on the underside of the partition wall 8 . Alternatively, however, the opening 29 can also be provided at a different position of the partition wall 8 . Furthermore, it is possible that several openings 29 are provided in order to realize the fluid connection between the combustion chamber 5 and the exhaust gas duct 7 . A negative pressure source (not shown in detail here) can be connected to the exhaust gas duct 7 on the downstream side in order to actively suck the exhaust gas present in the combustion chamber 5 into the exhaust gas duct 7 . In the region of that free end which is opposite the front-side housing wall 4, the housing 2 is provided with an annular flange 12 which projects radially outwards and has a thread 11 on the circumference.

During the operation of the device 1, the burner nozzles 6 are supplied with hydrogen and oxygen and the mixture in the area of the outlet opening of the burner nozzles 6 is ignited with the formation of flames which burn into the combustion chamber 5. The supply of hydrogen and oxygen is in figure 4 indicated by the arrow labeled 16,17. That through the Combustion resulting exhaust gas is distributed evenly in the combustion chamber 5 and gives off heat to the housing jacket 3 . The exhaust gas then passes through the opening 29 provided in the partition 8 into the exhaust gas duct 7 and is conducted there out of the housing 2 in the direction of the arrow 21 .

The in the figures 4 and 5 The hydrogen gas burner device 1 shown forms a heating element, the housing jacket 3 of which absorbs heat from the exhaust gas flowing through the combustion chamber 5 and then releases it to the environment 22 . For this purpose, it is expedient to manufacture at least the area of the housing 2 delimiting the combustion chamber 5 from a material with the highest possible thermal conductivity. With regard to the preferred materials, reference is made to the comments on the first embodiment. Condensate arising within the combustion chamber 5 or the exhaust gas duct 7 is discharged from the housing 2 via the condensate outlet opening 14 and can then be collected.

figure 6 12 shows a hydrogen gas combustor 1 according to a fifth embodiment of the present invention. This comprises an elongate, tubular housing 2 extending in an axial direction A, which has an outer housing casing 3 and is completely closed at one end by an end-side housing wall 4 . Furthermore, the hydrogen gas burner device comprises an annular combustion chamber 5 which is formed inside the housing 2, extends in the axial direction A and is delimited to the outside by the housing jacket 3 and a plurality of burner nozzles 6 which are arranged in an annular manner in the present case and which are designed to produce a hydrogen-oxygen Mixture to burn with the generation of burning in the combustion chamber 5 flames. In addition, inside the housing 2 there is an exhaust gas channel 7 which extends in the axial direction A and is fluidly connected to the combustion chamber 5, into which the exhaust gas coming from the combustion chamber 5 is introduced. The combustion chamber 5 and the exhaust gas duct 7 are arranged adjacent to one another in a direction transverse, in this case perpendicular to the axial direction A, and are separated from one another in regions by a partition wall 8 extending in the axial direction A. The partition 8 is tubular in this case, positioned centrally within the housing 2 and ends at a distance a in front of the front housing wall 4. The interior of the tubular partition 8 forms the exhaust gas duct 7, the combustion chamber 5 surrounds this ring. At the downstream end of the combustion chamber 5, the front housing wall 4 forms an annular section 30 that is convexly curved in the flow direction of the combustion chamber 5 and serves to deflect the exhaust gas impacting this section, as indicated by the arrows 34. An annular gap 31 is left between the annular section 30 and the free end of the annular partition 8 , through which the exhaust gas can flow in the direction of the arrow 19 from the combustion chamber 5 into the exhaust gas duct 7 . Furthermore, the housing 2 is provided with connecting ducts 32 which are circumferentially spaced from one another and extend respectively through the housing jacket 3 and the end wall 4 of the housing 2 and conduct exhaust gas from the upstream end of the combustion chamber 5 to the exhaust gas duct 7 . At the upstream end of the exhaust gas duct 7, a guide vane ring 33 is preferably provided, which is designed to deflect the exhaust gas flowing obliquely in the direction of the exhaust gas duct 7, so that it flows through the exhaust gas duct 7 in the direction of arrow 20 without major turbulence. At the downstream end of the exhaust gas duct 7 , exhaust gas recirculation openings 15 are advantageously provided which extend through the partition wall 8 and through which a part of the exhaust gas flowing through the exhaust gas duct 7 is routed back into the combustion chamber 5 . The remainder of the exhaust gas is routed out of the housing 2 in the direction of the arrow 21 .

During the operation of the device 1, the burner nozzles 6 are supplied with hydrogen and oxygen and the mixture in the area of the outlet opening of the burner nozzles 6 is ignited to form flames which burn into the combustion chamber 5. The supply of hydrogen and oxygen is in figure 6 indicated by arrows 16 and 17. The exhaust gas produced by the combustion flows through the combustion chamber 5 in the direction of the arrow 18 and gives off heat to the housing shell 3 . At the downstream end of the combustion chamber, part of the exhaust gas is deflected by the annular section 30 in the direction of arrows 34 and flows in the direction of arrows 35 back towards the burner nozzles 6, where it at least partially enters the connecting duct 32 and towards the exhaust gas duct 7 flows. The remainder of the exhaust gas arriving at the downstream end of the combustion chamber 5 is routed through the annular gap 31 directly in the direction of the exhaust gas duct 7 . At the upstream end of the exhaust gas duct, the exhaust gas is deflected by the vanes of the vane ring 33 , then guided through the exhaust gas duct 7 in the direction of arrow 20 and discharged from the housing 2 in the direction of arrow 21 . Condensate arising within the combustion chamber 5 or the exhaust gas duct 7 is drained out of the housing 2 via the condensate outlet opening 14 and can then be collected.

In the figure 6 The hydrogen gas burner device 1 shown forms a heating element, the housing jacket 3 of which absorbs heat from the exhaust gas flowing through the combustion chamber 5 and then releases it to the environment 22 . It is expedient to manufacture both the housing 2 and the conductive structure 24 from a material with the highest possible thermal conductivity. The partition wall 8 should be made of a material with low thermal conductivity in order to prevent the already cooled exhaust gas flowing through the exhaust gas channel 7 from being reheated by the hot exhaust gas flowing through the combustion chamber 5 . With regard to the preferred materials, reference is made to the comments on the first embodiment.

It should be understood that the embodiments described above are exemplary only and should not be construed as limiting. On the contrary, modifications are possible without departing from the scope of protection as defined by the appended claims.

reference number list

1

Hydrogen gas burner device

2

Housing

3

housing jacket

4

housing wall

5

combustion chamber

6

burner nozzle

7

exhaust duct

8th

partition wall

9

gas permeable wall

10

structure

11

thread

12

ring flange

13

horizontal

14

condensate outlet opening

15

exhaust gas recirculation opening

16

Arrow

17

Arrow

18

Arrow

19

Arrow

20

Arrow

21

Arrow

22

vicinity

23

heat transfer structure

24

lead structure

25

Management

26

Arrow

27

Arrow

28

supply line

29

opening

30

annular section

31

annular gap

32

connecting channel

33

vane ring

34

Arrow

35

Arrow

A

axial direction

a

Distance

i.e

thickness

a

angle

Claims (16)

Hydrogen gas burner device (1), comprising an elongate, tube-like housing (2) extending in an axial direction (A) with an outer housing shell (3), a housing (2) formed inside the housing (2) extending in the axial direction ( A) at least one burner nozzle (6) extending and outwardly delimited by the housing jacket (3), which is designed to burn a hydrogen-oxygen mixture while generating a flame that burns in the combustion chamber (5), and an exhaust gas duct (7) formed inside the housing (2), extending in the axial direction (A) and fluidly connected to the combustion chamber (5), into which the exhaust gas coming from the combustion chamber (5) is introduced, characterized in that one end of the housing (2) is completely closed by an end-side housing wall (4) so that the combustion chamber (5) and the exhaust gas duct (7) are adjacent in a direction transverse, in particular perpendicular, to the axial direction (A). t are arranged relative to one another, and that a partition wall (8) extending in the axial direction (A) is provided, which separates the combustion chamber (5) and the exhaust gas duct (7) from one another in certain areas. Device (1) according to Claim 1, characterized in that the thermal conductivity of that material from which the region of the housing casing (3) which outwardly delimits the combustion chamber (5) is made is higher than the thermal conductivity of that material from which the partition wall ( 8) is made. Device (1) according to Claim 1 or 2, characterized in that the combustion chamber (5) surrounds the exhaust gas duct (7) in the form of a ring and that the partition wall (8) is of tubular design. Device (1) according to Claim 3, characterized in that the partition (8) ends at a predetermined distance (a) in front of the end-side housing wall (4). Device (1) according to Claim 3 or 4, characterized in that the tubular partition (8) preferably has at least one opening (29) on its underside, through which exhaust gas from the combustion chamber (5) flows into the exhaust gas duct (7 ) is initiated. Device (1) according to Claim 1 or 2, characterized in that the partition (8) is flat, the partition (8) ending in particular at a predetermined distance (a) in front of the end-side housing wall (4), thereby forming an opening is, through which exhaust gas from the combustion chamber (5) is introduced into the exhaust gas duct (7) during operation. Device (1) according to one of the preceding claims, characterized in that the thickness (d) of the housing jacket (3) delimiting the combustion chamber (5) tapers in the flow direction of the combustion chamber (5), in particular tapers continuously. Device (1) according to one of the preceding claims, characterized in that the combustion chamber (5) has at least one gas-permeable wall (9) which extends transversely to the axial direction (A) over the entire cross section of the combustion chamber (5), the gas-permeable wall (9) is designed in particular in the manner of a membrane, grid-like or as a perforated plate. Device (1) according to Claim 8, characterized in that the gas-permeable wall (9) has a convex curvature in relation to the direction of flow through the combustion chamber (5). Device (1) according to one of the preceding claims, characterized in that exhaust gas recirculation openings (15) are provided in the partition (8), through which part of the exhaust gas flowing through the exhaust gas duct (7) is routed back into the combustion chamber (5). Device (1) according to one of the preceding claims, characterized in that in the combustion chamber (5), in particular in the rear region of the combustion chamber (5, viewed in the direction of flow), through which the exhaust gas can flow and with the housing jacket (3 ) associated heat transfer structures (23) are provided. Device (1) according to one of the preceding claims, characterized in that the at least one burner nozzle (6) is arranged on that end face of the housing (2) which is opposite the end face closed by the end face housing wall (4). Device (1) according to one of Claims 1 to 11, characterized in that a large number of burner nozzles (6) are provided, which are spaced apart from one another in the axial direction (A) within the combustion chamber (5) and in particular are uniformly distributed in such a way that burn their flames into the combustion chamber (5). Device (1) according to one of the preceding claims, characterized in that the combustion chamber (5) is provided with at least one condensate outlet opening (14). Device (1) according to Claim 14, characterized in that the at least one condensate outlet opening (14) is formed in the partition (8) or in the housing jacket (3) at the downstream end of the exhaust gas duct (7). Use of a device (1) according to one of the preceding claims as a heating rod of a heat exchanger which in particular forms part of a waste heat boiler.

Images