Burner element for a heating device, method for producing a burner element and heating device

Abstract

A burner element (4) for a heating appliance (10) is proposed. The burner element (4) is designed to be supplied with a combustion mixture of fuel gas and combustion air, which is then combusted at an outlet (32). It comprises a burner outlet element (24) and at least one burner part (34), which is arranged largely parallel to the burner outlet element (24). The burner outlet element (24) and the at least one burner part (34) are positively connected to each other by a first connection to form the burner element (4), and the burner element (4) is designed to be connected to a burner (1) of a heating appliance (10) by means of a second connection. Furthermore, a heating appliance (10) and a method for manufacturing a burner element (4) are proposed. The burner element (4) can significantly simplify the assembly of a burner (1).

Description

[0001] The invention relates to a burner element for a heating appliance, a method for manufacturing a burner element and a heating appliance.

[0002] Burners for heating appliances are known in a wide variety of designs. Typically, a conveying system in a heating appliance feeds a combustible mixture of fuel and combustion air into a burner cavity. From there, the mixture exits through a burner plate and combusts in a combustion chamber. Modern heating appliances usually incorporate additional components in the combustion chamber or burner cavity, such as a flame arrestor to prevent flame flashbacks. Distribution devices for placement within the burner cavity are also known. These devices homogenize the combustion air-fuel mixture and can stabilize flame formation. The use of such components is increasingly common with regard to the use of hydrogen-containing fuel gases.

[0003] The combustion of hydrogen differs significantly from the combustion of fossil fuels. Among other things, due to the considerably higher flame speed of hydrogen, the flame is less stable when burned in a heating appliance, and flame flashbacks are more likely to occur. Furthermore, the combustion of hydrogen can produce disruptive noise.

[0004] A burner with a flame arrestor is proposed, for example, in EP 4 160 092 A1.

[0005] The use of one or more internal components on a burner significantly complicates installation. Disassembly and / or reassembly of the burner may be necessary during maintenance or repair work. This creates the risk of forgetting one or more components or confusing their installation positions. Furthermore, imprecise assembly can lead to leaks and bypass flow. Both of these factors can reduce combustion quality and increase the likelihood of critical operating conditions. Finally, installing such a burner is time-consuming.

[0006] US Patent 5,240,411A discloses an atmospheric gas burner with a burner unit in which an outlet element of the burner is positively connected to at least one distribution element and the burner hood. A disadvantage is that maintenance work on such a burner is not possible, and in the event of a defect, the only option is a costly replacement of the burner unit.

[0007] DE 91 17 075 U1 describes an atmospheric, gas-fired radiant burner in which a radiant grid is attached by means of a screw connection that also secures the burner outlet element. A disadvantage is that the assembly and disassembly of such a burner is time-consuming and prone to errors.

[0008] It is therefore an object of the invention to at least partially alleviate or solve the problems described with reference to the prior art. In particular, a burner element for a heating appliance, a method for its manufacture, and a heating appliance are to be provided, which simplify the assembly of a burner. At the same time, high precision in the assembly of the burner should enable permanently reliable operation of the heating appliance.

[0009] These problems are solved by the features of the independent claims. Further advantageous embodiments of the solution proposed here are specified in the independent claims. It should be noted that the features listed in the dependent claims can be combined with one another in any technologically meaningful way and define further embodiments of the invention. Furthermore, the features specified in the claims are further specified and explained in the description, which also presents further preferred embodiments of the invention.

[0010] This is achieved using a burner element for a heating appliance. The burner element is designed to be permeated by a combustion mixture of fuel gas and combustion air, which is then combusted at an outlet of the burner element. The burner element comprises at least one burner outlet element and at least one burner part, which is arranged largely parallel to the burner outlet element. The at least one burner outlet element and the at least one burner part are positively connected to each other by a first connection. The burner element is designed to be attached to a burner of a heating appliance by a second connection.

[0011] According to the invention, a burner element is provided that positively connects at least one burner outlet element and at least one further burner part to form a one-piece, monolithic burner element. The burner element is thus configured to perform at least one additional function besides providing a burner outlet element through which the combustion mixture can exit into the combustion chamber and burn. This additional function can, in particular, involve homogenizing the combustion mixture by means of a distribution device (integrated into the burner element) as well as preventing flame propagation against the flow direction of the heating device and thus preventing flame flashback by means of a flame arrestor integrated into the burner element.This design significantly simplifies burner assembly, as only a monolithic burner element needs to be mounted instead of numerous components. The first connection allows at least the combustion outlet element and at least one burner part to be joined to form the burner element, which is then configured to be attached to a heating appliance burner via the second connection. This second connection can also be a positive-locking connection, particularly a screw connection. Furthermore, it is advantageous to manufacture the burner element under ideal conditions, thus achieving high precision and functionality. The burner element is designed to cover the entire flow cross-section and be positioned within part or all of the available flow cross-section between the burner cavity and the combustion chamber.The burner element has one inlet side facing the burner cavity and one outlet side facing the combustion chamber of the heating appliance. The heating appliance can supply a building with heating and / or hot water and can be wall-mounted or freestanding. In particular, the heating appliance can deliver a heat output of up to 50 kilowatts.

[0012] The heating appliance can draw in a mass flow of combustion air via an air supply using a conveying device. A mass flow of fuel gas corresponding to a predetermined combustion air ratio, also known as lambda or air ratio, is added to this air. The resulting combustion mixture can be fed to the burner via a mixture channel, flowing into the burner cavity. It then flows through the burner element from an inlet side to an outlet side, exiting into the combustion chamber and combusting. For this purpose, the heating appliance can include an ignition device to ignite the combustion mixture at the burner element. The combustion products can then be discharged via an exhaust duct from the heating appliance into the building's exhaust system. The heating appliance can include a control unit that regulates the combustion process and, in particular, sets a predetermined combustion air ratio.

[0013] The heating appliance can have a gas valve to control the mass flow of fuel gas, which typically includes a gas safety valve and a gas control valve. The gas control valve can be, in particular, a stepper motor valve capable of setting a defined mass flow of fuel gas. Alternatively, the gas control valve can also deliver a mass flow of fuel gas according to a transmitted control pressure. The control pressure can be measured in a Venturi device and serve as a measure of the delivered mass flow of combustion air. This configuration is also known as a pneumatic gas-air system. The safety valve is designed to prevent the escape of unburned fuel gas and, for example, during the heating appliance's start-up process, is only released after the delivery system has been activated to a starting power level suitable for the start-up process. The aforementioned components can be any part of the heating appliance itself.

[0014] The heating appliance can adjust its burner output to the demand, a process also known as "modulation." Upon detecting a change in heat demand, for example, by considering the flow and return temperatures of a heating circuit connected to the appliance, the control unit can adjust the fan output (the air supply unit) and thus the combustion air flow rate to match the heat demand. Simultaneously, the combustion control system adjusts the fuel gas flow rate to the changing combustion air flow rate. To prevent flame flashbacks at low output levels, the combustion air ratio is often adjusted, particularly by increasing the proportion of combustion air. The resulting increase in flow velocity (at the same heating appliance output) and reduction in flame speed can mitigate the risk of flame flashbacks.Nevertheless, during a modulation process of the heating device, there is an increased risk of flame flashback or combustion noises occurring.

[0015] The combustion chamber can include one or more heat exchangers that transfer the heat generated during combustion to a heat transfer fluid circulating in a heating circuit or to domestic hot water. The heating appliance can be, in particular, a condensing boiler, in which the exhaust gas is cooled to a temperature that allows the utilization of the condensation heat of the water vapor contained in the exhaust gas. For example, a primary heat exchanger can be located at least partially in or on a wall of the combustion chamber, thus enabling the transfer of heat from the exhaust gas flow as well as the heat radiation from the flame to a heat transfer fluid.

[0016] The heating appliance can be designed to burn a fuel gas with a (pure) hydrogen content of at least 80 percent, in particular a fuel gas with a hydrogen content of at least 90 or 95 percent, or even virtually pure hydrogen. Here, "fuel gas" refers to the fuel that is added to the combustion air according to a specific air-fuel ratio.

[0017] The burner of the heating appliance can include a burner housing that forms a burner flange to which the burner element can be attached. This can be done, in particular, by means of a screw connection. The burner housing, in conjunction with the burner element, can form a burner cavity into which the combustion mixture can flow from the mixture channel and exit through the burner element into the combustion chamber.

[0018] The burner element can be designed to be largely flat. This applies particularly to an outer contour of the burner element. For example, a burner outlet element and / or a burner part can have a three-dimensional shape and, in particular, be curved within an inner area enclosed by the outer contour. Specifically, an outer contour of the at least one burner outlet element and the at least one burner part can be flat or planar, allowing the burner element to be sealed to a burner flange of the burner hood. A sealing element can be arranged between the burner hood and the burner element for this purpose. The outer contour refers to an outer area of ​​the burner element that encloses an inner region through which the combustion mixture flows.The external dimensions can correspond to those of a burner flange; in particular, mounting points on the burner element can correspond to predefined mounting points on the burner flange. Therefore, the invention is also very well suited for use with existing heating appliances, since the burner element can be configured for mounting on any burner flange.

[0019] The burner element can also have a cylindrical shape, wherein the burner outlet element and the at least one burner part have the shape of a hollow cylinder, in particular with a circular base, and can be mounted on a burner door as a burner hood. The diameter (of the base) of a burner part can be selected to be slightly smaller than the diameter (of the base) of the burner outlet element, so that they can be arranged parallel or one inside the other.

[0020] The burner outlet element comprises numerous openings through which the combustion mixture can flow. A burner outlet element is often also referred to as a perforated plate. During normal operation of the heating appliance, the combustion mixture passes through the burner outlet element and then combusts at one of its outlet sides in the combustion chamber. Therefore, the burner outlet element can be located at or even form the outlet side of the burner assembly.

[0021] The at least one burner outlet element and the at least one burner part are positively connected to each other by means of the first connection. The positively connected first connection is characterized in particular by the fact that it flushly, and especially gas-tightly, encompasses the lateral or circumferential outer surface of the burner outlet element and burner part. Preferably, the positively connected first connection extends over the entire circumference of the burner outlet element and burner part. For this purpose, a type of frame or surround can be provided, which rests on an (upper or lower) edge region of the burner outlet element and burner part and spans the circumferential region of the burner outlet element and burner part (completely), thereby also essentially positively enclosing the circumferential outer contour of the burner outlet element and burner part.The form-fitting first connection is designed in particular to prevent lateral escape of gas and / or flames.

[0022] The at least one burner outlet element and the at least one burner part can form a kind of stack, wherein the components are arranged (only) in abutting each other at the edge and / or substantially completely abutting each other. This can be described as a layered structure. Preferably, all burner outlet elements, burner parts, and any components arranged between them abut each other, at least in a common edge region, so that a jointly interlocking first connection is feasible or has been realized for this stack or layered structure.

[0023] According to one embodiment, the at least one burner part can be a flame arrestor, a distribution device, and / or a fixing of the flame arrestor or distribution device. The at least one burner part can, in particular, be designed as a planar structure with an outer contour that is largely identical to the outer contour of the burner outlet element.

[0024] A flame arrestor is designed to prevent flame penetration and thus the propagation of a flame flashback into the mixture channel. A variety of flame arrestors are known from the prior art. For this purpose, the flame arrestor can have channels through which the combustion mixture can flow. These channels can have a diameter smaller than a predetermined critical diameter. The critical diameter is the diameter above which a flame can penetrate the channel. The flame arrestor can, in particular, be arranged directly adjacent to the inlet side of the at least one burner outlet element.

[0025] A distribution device can have a multitude of openings that ensure mixing and homogenization of the combustion mixture. For this purpose, the distribution device can comprise or consist of a fibrous material, a grid structure, a (3D) fabric, and / or a braid. The distribution device can be located, in particular, at or form the inlet side of the burner element.

[0026] A fixing structure for a flame arrestor or distribution device can provide mechanical support for the flame arrestor or distribution device. Such a fixing structure is particularly useful when the flame arrestor or distribution device has low mechanical stability, especially low flexural stiffness. The fixing structure can then prevent bulging of the flame arrestor or distribution device, for example, due to a pressure impulse such as a hard ignition or a flame flashback. Therefore, the fixing structure can be located adjacent to and upstream of the flame arrestor or distribution device, relative to the flow direction.

[0027] According to one embodiment, at least one sealing element can be arranged on one or both sides of the burner outlet element and / or the at least one burner part. In particular, each burner outlet element and each burner part can have a sealing element on both the inlet and outlet sides.

[0028] According to one embodiment, the positive-locking first connection can be a crimp connection. A crimp connection is a positive-locking connection formed by plastic deformation. Advantageously, such a (first) connection can be produced in a simple manner. Areas of the outer contour of one or more components to be joined (burner outlet element, burner component(s), sealing elements) can be plastically deformed in such a way that a one-piece burner element is formed.

[0029] According to one embodiment, a retaining element can be designed to enclose the outer contours of the components (burner outlet element, burner component(s), sealing elements). This enclosing can be achieved by plastic deformation of the retaining element. The retaining element can be understood as a frame-like structure that covers the outer contours of the components as well as the outer area of ​​the inlet and outlet sides of the burner element. Through plastic deformation during the manufacturing of the burner element, the retaining element can also exert a compressive force between the inlet and outlet sides, pressing the components of the burner element together. This advantageously minimizes leakage and bypass paths. The retaining element can, in particular, be designed to be connected to a burner flange of the heating device. In this respect, the retaining element can form the outer surface of the burner element.The retaining part is specifically designed to fulfill the functions of the positively locked first connection described above (independently or completely).

[0030] According to one embodiment, the retaining element can be made of a material with a thermal conductivity exceeding a predetermined limit. This allows the retaining element, which is thermally coupled to the components of the burner element, to effectively support heat dissipation from the burner element. The limit can be specified to ensure that a maximum temperature of the burner element is not exceeded and can be determined, for example, in laboratory tests using a reference heater.

[0031] According to one embodiment, the retaining part can have openings for fasteners for attachment to a burner flange of the burner. The fasteners can correspond to attachment points of the burner flange.

[0032] Another aspect is addressed, and a method for manufacturing a burner element described here is proposed. This method comprises at least the following steps: a) Forming a stack consisting of at least one burner outlet element and / or at least one burner part and / or at least one fixing of flame arrestor or distribution device and / or at least one sealing element, and b) Enclosing and forming a retaining part by means of plastic deformation around a common outer contour of the stack formed in step a), whereby the burner element is formed in one piece.

[0033] During a regular execution of the procedure, steps a) and b) can be performed at least once in the specified order. The procedure is designed to simplify the installation of a burner in a heating appliance.

[0034] According to step a), a stack can be formed from a burner outlet element and / or at least one burner part and / or at least one flame arrestor or distribution device fixing and / or at least one sealing element. Forming a stack means arranging the components (burner outlet element(s), burner part(s), sealing element(s)) in the desired sequence. The stack can thus be understood as a straight cylinder in which the base is oriented perpendicular to the flow direction and the outer surface is formed by the outer contours or end faces of the components. An exemplary arrangement, starting from the outlet side of the burner element, can consist of the following sequence: sealing element, burner outlet element, sealing element, flame arrestor, sealing element, distribution device, sealing element.

[0035] According to step b), a retaining element can be formed by plastic deformation around a common outer contour of the stack formed in step a), thereby forming the burner element in one piece. This can also be understood as forming a first connection between the stack and a monolithic burner element. In other words, a monolithic burner element is joined from the stack and the retaining element by plastic deformation. This can be achieved, for example, by arranging the stack from step a) in a retaining element that is open at one end and then closing the retaining element on both sides by plastic deformation. "Closing on both sides" here means that the retaining element encloses the outer contour, and thus the outer surface, of the cylinder formed by the stack, and also projects into the outer area of ​​the side designed for flow.The term "outer area" here refers to the external area necessary for securing / enclosing the stack, analogous to a flange. This outer area can correspond to the outer shape of the burner flange of the insert heater.

[0036] The details, features, and designs discussed in connection with the burner element can also occur in a method and a heating device proposed here, and vice versa. In this respect, the features relating to the burner element can also be used to characterize the method and / or the heating device, and vice versa.

[0037] This document describes a burner element, a heating device, and a method for manufacturing a burner element, which at least partially solve the problems described with reference to the prior art. In particular, the burner element and the method for its manufacture contribute significantly to simplifying the assembly of a burner and thus of a heating device. Furthermore, potential sources of error during assembly can be eliminated, thereby increasing the operational reliability of the heating device.

[0038] Furthermore, the invention is very well suited for retrofitting existing heating devices and can often be carried out without structural modifications to the heating device.

[0039] The invention and its technical context are explained in more detail below with reference to the accompanying figures. It should be noted that the invention is not intended to be limited by the exemplary embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the situations described in the figures and combine them with other components and findings from the present description. It should be emphasized that the figures, and especially the depicted dimensions, are only schematic. They show: Fig. 1: a heating device proposed here, and Fig. 2: a burner element proposed here in assembly drawing, Fig. 3: the burner element made of Fig. 3 with retaining part, Fig. 4: an assembly drawing of another burner element, and Fig. 5: a burner with a burner element.

[0040] Fig. 1 Figure 10 shows an exemplary and schematic representation of a heating device 10. This device can include a burner 1, which is at least partially arranged in a combustion chamber 3. Combustion air can be drawn from the environment via an air supply 13 in a flow direction 15 by means of a conveying device 6, which here is designed as a blower. The conveying device 6 can have an electric motor as its drive, which can be connected to a speed control 9 that can regulate the speed of the conveying device 6 by means of a pulse-width modulated (PWM) signal. A gas valve 12 can add fuel gas (here hydrogen) from a fuel gas supply 11 to the intake air mass flow and includes a safety valve and a fuel gas control valve for controlling the mass flow of fuel gas to be added. The resulting combustion mixture of fuel gas and combustion air can flow to the burner 1 via a mixture channel 7 and be ignited there by an ignition device.The heat generated during combustion can be transferred, for example, to a heat transfer medium in a heating circuit by means of a heat exchanger 19.

[0041] The burner 1 comprises a burner hood 2, a burner cavity 28 into which the combustion mixture is supplied from the mixture channel 7 and exits via a burner element 4 into the combustion chamber 3, where it burns, forming a flame 5. The burner element 4 can be configured in the burner 1 as shown in Fig. 1 The burner hood 2 is shown to have a cylindrical shape and can be attached to a burner door with a base surface such that the combustion mixture can flow from the mixture channel 7 into the burner hood 2 and thus into the burner cavity 28. After combustion, the combustion products can be discharged to the outside via an exhaust gas channel 18 arranged in the heating unit 10 and an exhaust system 17 in the flow direction 15.

[0042] The heating device 10 shown here is designed for the combustion of hydrogen. The heating device 10 can also include a flame monitoring device 14, which can be configured, for example, as an electrode for measuring ionization current. Alternatively or additionally, another sensor, such as a thermal, optical, acoustic, or chemical sensor, can be provided to perform the flame monitoring function 14. In particular, the use of a sensor for UV (ultraviolet) radiation emitted by the flame has proven suitable for flame monitoring 14 of a flame 5 during hydrogen combustion.

[0043] A control and regulating unit 8 can be configured to regulate the heating device 10. For this purpose, it can be electrically connected, for example, to the speed control 9, the conveying device 6, the gas valve 12, and the flame monitoring 14.

[0044] Fig. 2 The diagram shows components of a burner element 4, which are designed to be largely flat for a flat burner. With the components shown in the diagram... Fig. 2 The components shown can be used to create a monolithic burner element 4, in particular with a component located in the Fig. 2 The retaining part 16 (not shown) is produced by connecting the components to the burner element 4 via a first connection. A burner outlet element 24 can be arranged on or form an outlet side 32 of the burner element 4. Upstream of the burner outlet element 24, in the flow direction 15, a fixing 23 for a flame arrestor 22, the flame arrestor 22, and a distribution device 20 can be arranged in this order. A sealing element 21 can be arranged between each of the aforementioned components, i.e., between the burner outlet element 4 and the fixing 23, and between the fixing 23 and the distribution device 22, forming a stack 33. Furthermore, a sealing element 21 can be arranged on an inlet side 31 of the burner element 4 with respect to the flow direction 15, and another on an outlet side 32 of the burner element 4 with respect to the flow direction 15.A distribution device 20, a flame arrestor 22, a fixing 23, and a sealing element 21 can also be understood as burner components 34. The burner components 34 and the burner outlet element 24 can have a largely identical outer contour 27 and thus be arranged one above the other, forming an end face of the stack 33. The aforementioned formation of the stack 33 can also represent an embodiment of step a) of a method proposed here.

[0045] Fig. 3 The burner element 4 is shown after carrying out step b) of a procedure proposed here with the in Fig. 2 The stack 33 shown is inserted into a retaining element 16, and the retaining element 16 is then plastically deformed by crimping such that the stack 33 is compressed with a compressive force in the flow direction 15 greater than a predetermined threshold value. For this purpose, the retaining element 16 can enclose the stack 33 in an outer area 26 of the inlet side 31 and the outlet side 32. In the outer area 26, the retaining element 16 can include mounting openings 25 for assembly with a second connection to a burner flange 30. The retaining element 16 can also include openings. The burner element 4 produced in this way can be easily mounted to a burner 1 with the second connection. The precise assembly of the burner element 4 using the method proposed here can ensure that no bypass flows or leaks occur.

[0046] Fig. 4 shows an assembly drawing according to Fig. 2 an alternative embodiment of the burner element 4. This element comprises, as burner parts 34, a flame arrestor 22, a fixing 23 for the flame arrestor 23, and sealing elements 21. The resulting stack 33 can be connected to the first connection by means of a retaining part 16 and according to step b) of a method proposed here to form a burner element 4.

[0047] Fig. 5 shows a burner 1 with a burner element 4 proposed here. The burner 1 in Fig. 5 can be in a heating appliance 10 according to Fig. 1 be installed. For burner 1 according to Fig. 5This is a flat burner with a burner hood 2 which, together with the burner element 4, forms the burner cavity 28, which is connected to the mixture channel 7. The combustion mixture can enter the burner cavity 28 from the mixture channel 7 in the flow direction 15, flow through the burner element 4, exit into the combustion chamber 3 and burn there, forming a flame 5.

[0048] The burner hood 2 can form the burner flange 30, which can receive the burner element 4 and to which it can be mounted by means of a fastening 29, forming the second connection, here designed as a screw connection. As an advantage of the invention, when mounting the burner 1, only the burner element 4 needs to be attached to the burner flange 30 in a sealing manner, thus creating only one sealing connection. Reference symbol list

[0049] 1 Burner 2 Burner cover 3 Combustion chamber 4 Burner element 5 Flame 6 Conveyor device 7 Mixing channel 8 Control and regulating unit 9 Speed ​​control 10 Heater 11 Fuel gas supply 12 Gas valve 13 Air supply 14 Flame monitoring 15 Flow direction 16 Mounting bracket 17 Exhaust system 18 Exhaust duct 19 Heat exchanger 20 Distribution device 21 Sealing element 22 Flame arrestor 23 Fixing 24 Burner outlet element 25 Mounting openings 26 Exterior 27 Outer contour 28 Burner cavity 29 Mounting 30 Burner flange 31 Inlet side 32 Outlet side 33 Stack 34 Burner part

Claims

1. Burner element (4) for a heating appliance (10), configured to be supplied with a combustion mixture of a fuel gas and combustion air and to burn this mixture at an outlet side (32), comprising a burner outlet element (24), and at least one burner part (34) arranged parallel to the burner outlet element (24), wherein the burner outlet element (24) and the at least one burner part (34) are positively connected to each other by a first connection to form the burner element (4) and the burner element (4) is configured to be attached to a burner of a heating appliance by a second connection.

2. Burner element (4) according to claim 1, wherein the at least one burner part (34) is a flame arrestor (22), a distribution device (20) and / or a fixing (23) of flame arrestor (22) or distribution device (20), which are arranged facing an inlet side (31) of the burner element (4).

3. Burner element (4) according to one of the preceding claims, wherein at least one sealing element (21) is arranged on one or both sides of the burner outlet element (24) and / or the at least one burner part (34).

4. Burner element (4) according to one of the preceding claims, wherein the first positive-locking connection is a crimp connection.

5. Burner element (4) according to claim 4, wherein a retaining part (16) surrounds outer contours (27) of the burner outlet element (24), of the at least one burner part (34) and / or of the at least one sealing element (21) and forms the first connection.

6. Burner element (4) according to claim 5, wherein the retaining part (16) has fastening openings (25) for fastening means for fastening (29) to a burner flange (30) of the burner (1).

7. Burner element (4) according to claim 5 or 6, wherein the burner element (4) comprises a distribution device (20) and a flame arrestor (22) arranged between the burner outlet element (24) and the distribution device (20), and a sealing element (21) is arranged between the retaining part (16), the flame arrestor (22), the distribution device (20) and the burner outlet element (24).

8. Heating appliance (10) comprising a conveying device (6) configured to convey a combustion mixture of a fuel and combustion air to a burner (1), wherein the burner (1) comprises a burner element (4) according to one of the preceding claims.

9. Heating device (10) according to claim 8, wherein the heating device (10) is configured for the combustion of a fuel gas containing at least 80 percent hydrogen as fuel.

10. Method for manufacturing a burner element (4) according to any one of claims 1 to 7, comprising at least the following steps: a) forming a stack (33) from at least one burner outlet element (24) and at least one burner part (34), and b) enclosing a retaining part (16) by means of plastic deformation around a common outer contour (27) of the stack (33) formed in step a), whereby the burner element (4) is formed in one piece.

11. Method according to claim 10, wherein, during the execution of step b), a compressive force connecting the stack (33) and the retaining part (16) is applied greater than a threshold value.

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