BURNER DEVICE, HEAT GENERATOR, HEATING SYSTEM AND SERVICE WATER SUPPLY SYSTEM AND METHOD FOR VIBRATION ADAPTATION OF A BURNER DEVICE

Abstract

The invention provides a burner device 100 for providing thermal energy by combustion of an air-fuel mixture G, which burner device comprises a flame body 1 which delimits an interior space 11 which is connected via openings in the flame body 1 to an outer combustion surface 12 of the flame body 1, on which the combustion of an air-fuel mixture G, which is introduced into the interior space 11 and flows through the openings, takes place in one or more burner flames, and a flow guiding device 2 which comprises an axial flow channel 21, which is located mostly or completely in the interior space 11, for guiding through the air-fuel mixture G, which runs in particular parallel to a longitudinal axis LA of the flame body 1, the axial length of which is selected as a function of an oscillation frequency induced by the one or more burner flames.

Claims

1-15. (canceled)

16. A burner device for providing thermal energy by combustion of an air-fuel mixture, comprising: a flame body which delimits an interior space which is connected via openings in the flame body to an outer combustion surface of the flame body, on which a combustion of the air-fuel mixture, which is introduced into the interior space and flows through the openings, takes place in one or more burner flames, and a flow guiding device which comprises an axial flow channel, which is located mostly or completely in the interior space, for guiding through the air-fuel mixture, which runs in parallel to a longitudinal axis of the flame body, the axial length of which is selected as a function of an oscillation frequency induced by the one or more burner flames.

17. The burner device according to claim 16, wherein the axial length is selected as a function of an oscillation frequency of the burner device which occurs when the burner device is operated without a flow guiding device.

18. The burner device according to claim 17, wherein the axial length is additionally selected as a function of the speed of sound of the air-fuel mixture.

19. The burner device according to claim 16, wherein a ratio of a cross-sectional area of the axial flow channel in a cross section perpendicular to the longitudinal axis of the flame body to an inlet surface via which the air-fuel mixture is introduced into the interior space is greater than or equal to 15%.

20. The burner device according to claim 16, wherein the axial flow channel is arranged centrally with respect to the flame body, so that, in the cross section perpendicular to the longitudinal axis of the flame body, it is spaced apart from a circumferential inner wall of the flame body adjoining the interior space.

21. The burner device according to claim 20, characterized in that the flow guiding device comprises further flow channels for guiding through the air-fuel mixture, which run in parallel to a longitudinal axis of the flame body, which are arranged between the axial flow channel and the circumferential inner wall of the flame body with respect to the cross section perpendicular to the longitudinal axis of the flame body.

22. The burner device at least according to claim 21, wherein the flow guiding device comprises at least three further flow channels which, with respect to the cross section perpendicular to the longitudinal axis of the flame body, completely surround an outer circumference of the axial flow channel.

23. The burner device at least according to claim 21, wherein the flow guiding device is designed as a pipe insert which comprises a central pipe element which forms the axial flow channel, and a plurality of fin elements which are arranged directed outwardly on an outer circumference of the central pipe element, wherein in each case two of the plurality of fin elements delimit one of the further flow channels in a circumferential direction of the pipe insert.

24. The burner device according to claim 23, characterized in that radial end portions of the fin elements terminate flush with a circumferential inner wall of the flame body, such that the further flow channels in the cross section perpendicular to the longitudinal axis of the flame body are formed in each case by a portion of the pipe element, portions of two of the plurality of fin elements and by a portion of the circumferential inner wall of the flame body.

25. The burner device at least according to claim 23, wherein the burner device furthermore comprises a flame barrier arranged mostly or completely in the interior space, wherein the flow guiding device is arranged mostly or completely within the flame barrier, and radial end portions of the fin elements terminate flush with a circumferential inner wall of the flame barrier, such that the further flow channels in the cross section perpendicular to the longitudinal axis of the flame body are formed in each case by a portion of the pipe element, portions of two of the plurality of fin elements and by a portion of a circumferential inner wall of the flame barrier.

26. The burner device according to claim 16, wherein the burner device furthermore comprises a flame barrier arranged mostly or completely in the interior space, wherein the flow guiding device is arranged mostly or completely within the flame barrier.

27. A method for vibration adaptation of a burner device which is configured for providing thermal energy by combustion of an air-fuel mixture, and which comprises a flame body delimiting an interior space which is connected via openings in the flame body to an outer combustion surface of the flame body, on which a combustion of an air-fuel mixture, which is introduced into the interior space and flows through the openings, takes place in one or more burner flames, the method comprising: operating the burner device with combusting the air-fuel mixture on the outer combustion surface of the flame body; detecting an oscillation frequency of the burner device during operation, with a detection point in a combustion chamber of the burner device or in an environment of the burner device; providing a flow guiding device which comprises an axial flow channel for guiding through the air-fuel mixture, which in turn comprises: determining an axial length of the axial flow channel as a function of the detected oscillation frequency; and creating the flow guiding device, the axial flow channel of which has a length which corresponds to the determined axial length; and inserting the provided flow guiding device into the interior space of the burner device.

28. A heat generator for transferring thermal energy onto a fluid, for use in a heating system or in a service water supply system, the heat generator comprising: a burner device for providing thermal energy by combustion of an air-fuel mixture, including: a flame body which delimits an interior space which is connected via openings in the flame body to an outer combustion surface of the flame body, on which a combustion of the air-fuel mixture, which is introduced into the interior space and flows through the openings, takes place in one or more burner flames, and a flow guiding device which comprises an axial flow channel, which is located mostly or completely in the interior space, for guiding through the air-fuel mixture, which runs in parallel to a longitudinal axis of the flame body, the axial length of which is selected as a function of an oscillation frequency induced by the one or more burner flames; and a heat exchanger which is coupled to the burner device and via which thermal energy provided by the burner device can be transferred onto the fluid.

29. The heat generator according to claim 28, which is incorporated in a heating system for heating a building, wherein the heating system includes a pipe system for transporting a fluid energy transport medium; and the heat generator is for heating the energy transport medium to be transported through the pipe system.

30. The heat generator according to claim 28, which is incorporated in a service water supply system for supplying service water, wherein the heating system includes a pipe system for transporting the service water; and the heat generator is for heating the service water to be transported through the pipe system.

Description

[0081] FIGS. 1A and 1B show cross sections of a partial region of a first exemplary embodiment of the burner device according to the invention.

[0082] FIGS. 2A and 2B show cross sections of a partial region of a second exemplary embodiment of the burner device according to the invention.

[0083] FIG. 3 shows a perspective view of a flow guiding device, as is used in the exemplary embodiments in FIGS. 1 and 2.

[0084] FIG. 4 shows a schematic flow diagram of an exemplary embodiment of the method according to the invention for vibration reduction.

[0085] It is emphasized that the present invention is in no way limited to the exemplary embodiments described below and the exemplary features thereof. The invention furthermore comprises modifications of the exemplary embodiments mentioned, in particular those which emerge from modifications and/or combinations of individual or a plurality of features of the exemplary embodiments described within the scope of protection of the independent claims.

DETAILED DESCRIPTION OF THE FIGURES

[0086] In the following figures, flow directions of the air-fuel mixture G are indicated by the arrows which are partially denoted by G.

[0087] FIG. 1A shows a cross section of a partial region of a first exemplary embodiment of the burner device 100 according to the invention along a longitudinal axis LA of a flame body 1. FIG. 1B shows a cross section perpendicular to the longitudinal axis LA in the section plane A-A denoted in FIG. 1A.

[0088] The burner device 100 is configured for providing thermal energy by combustion of an air-fuel mixture G and comprises a flame body 1 and a flow guiding device 2.

[0089] The flame body 1 delimits an interior space 11 which is connected via openings in the flame body 1 to an outer combustion surface 12 of the flame body 1, on which the combustion of an air-fuel mixture G, which is introduced into the interior space 11 and flows through the openings, takes place in one or more burner flames.

[0090] The flow guiding device 2 is arranged in the interior space 11 and comprises an axial flow channel 21, which is located in the interior space 11, for guiding through the air-fuel mixture G, which runs parallel to the longitudinal axis LA of the flame body 1 in the first exemplary embodiment. Furthermore, the flow guiding device 2 comprises three further flow channels 22 which, with respect to a cross section perpendicular to the longitudinal axis LA of the flame body 1, completely surround an outer circumference of the axial flow channel 21 (see FIG. 1B).

[0091] The axial length L of the axial flow channel 21 is selected as a function of an oscillation frequency induced by the one or more burner flames. With respect to the flame body 1, the axial flow channel 21 is arranged centrally, so that, in the cross section perpendicular to the longitudinal axis LA of the flame body 1, it is spaced apart from a circumferential inner wall of the flame body 1 adjoining the interior space 11.

[0092] The flow guiding device 2 is designed as a pipe insert which comprises a central pipe element 23 which forms the axial flow channel 21, and three fin elements 24 which are arranged directed outwardly on an outer circumference of the central pipe element 23, wherein in each case two of the plurality of fin elements 24 delimit one of the three further flow channels 22 in a circumferential direction of the pipe insert.

[0093] Radial end portions of the fin elements 24 terminate flush with a circumferential inner wall of the flame body 1, such that the three further flow channels 22 in the cross section perpendicular to the longitudinal axis LA of the flame body 1 are formed in each case by a portion of the pipe element 23, portions of in each case two of the three fin elements 24 and by a portion of the circumferential inner wall of the flame body 1 (see FIG. 1B).

[0094] In this case, the air-fuel mixture G is introduced via the right-hand opening of the circular cylindrical flame body 1 to the interior space 11, the opening surface of which in this case also corresponds to an inlet surface 13 for the air-fuel mixture G.

[0095] In this case, the axial flow channel 21, which is likewise of circular cylindrical configuration, in the cross section perpendicular to the longitudinal axis LA of the flame body 1 has approximately a diameter which corresponds to 50% or more of the diameter of the inlet surface 13.

[0096] By means of the flow guiding device 2, a type of resonator for the air-fuel mixture G is formed in the interior space 11, which resonator is adapted to the oscillation frequency and via which the vibration behavior of the entire burner device 100 is significantly changed in comparison with an embodiment without a flow guiding device 2, in order thus in particular to reduce vibrations of the burner device 100 and/or of the components thereof, as a result of which the risk of incomplete combustion and/or of flame flashbacks into the interior space 11 is reduced, which in turn increases the efficiency of the burner device 100. In addition, this results in a lower sound emission during operation, which is perceived by the user as high comfort.

[0097] FIG. 2A shows a cross section of a partial region of a second exemplary embodiment of the burner device 100 according to the invention along a longitudinal axis LA of a flame body 1. FIG. 2B shows a cross section perpendicular to the longitudinal axis LA in the section plane A-A denoted in FIG. 2A.

[0098] The basic construction corresponds approximately to that of the first exemplary embodiment, for which reason a further description is dispensed with at this point.

[0099] The essential difference between the first and the second exemplary embodiment is that the latter also has a flame barrier 3 arranged mostly in the interior space 11, which is suitable in particular for use with hydrogen-containing fuels.

[0100] In this case, the inlet surface 13 corresponds to the opening surface of the right-hand opening of the flame barrier 3 from FIG. 2A, via which opening surface the air-fuel mixture G is introduced into the interior space 11 or into the interior of the flame barrier 3 and is offset parallel with respect to an opening surface 11 of the flame body 1 along the longitudinal axis LA. The interior of the flame barrier 3 is at least a partial region of the interior space 11.

[0101] Thus, the introduction into the flame barrier 3 takes place, which is permeable for the air-fuel mixture G, so that during operation the air-fuel mixture G flows from the partial region of the interior space 11 located in the interior of the flame barrier 3 through the flame barrier 3 into one of the remaining partial regions of the interior space 11 and exits from there through the openings in the flame body onto the combustion surface 12.

[0102] In contrast to the first exemplary embodiment from FIGS. 1A and 1B, the pipe insert in this case is not fitted into the flame body 1, but rather mostly into the flame barrier 3, and is thus located merely in the partial region of the interior space 11 delimited by the flame barrier 3.

[0103] In this way, the flow guiding device 2 is arranged upstream (with respect to the flow direction of the air-fuel mixture G during the operation of the burner device 100) of the flame barrier 3 and can contribute there to the vibration reduction, wherein said flame barrier is not only protected against recoiling flames, but rather also does not impede a flow of the air-fuel mixture G in the region of the openings of the flame body 1.

[0104] FIG. 3 shows a perspective view of a flow guiding device 2, as is used in the exemplary embodiments in FIGS. 1A, 1B and 2A, 2B.

[0105] The flow guiding device 2 is designed as a pipe insert which is fitted either into the flame body 1 from FIGS. 1A, 1B or into the flame barrier 3 from FIGS. 2A, 2B.

[0106] The pipe insert comprises a central pipe element 23 which forms the axial flow channel 21 with the axial length L selected as a function of the oscillation frequency, and three fin elements 24 which are arranged directed outwardly on an outer circumference of the central pipe element 23.

[0107] The pipe insert in this case can be manufactured from one piece. Alternatively, the finished fin elements 24 can also be cohesively connected to the pipe element in order to provide the pipe insert.

[0108] At least one of the fin elements 24 has, on the rear side, a cutout which serves as an anti-rotation safeguard within the interior space 11 or within the flame barrier 3.

[0109] FIG. 4 shows a schematic flow diagram of an exemplary embodiment of the method according to the invention for vibration reduction on a burner device.

[0110] In step S1, a burner device is operated with combusting an air-fuel mixture on an outer combustion surface of the flame body.

[0111] In this case, the burner device is configured for providing thermal energy by combustion of the air-fuel mixture and for this purpose comprises the flame body which delimits an interior space which is connected via openings in the flame body to the outer combustion surface of the flame body, on which the combustion of the air-fuel mixture, which is introduced into the interior space and flows through the openings, takes place in one or more burner flames.

[0112] In step S2, an oscillation frequency of the burner device is detected during operation, in turn comprising the substeps S2.1 and S2.2.

[0113] In step S2.1, a frequency spectrum of the vibrations of the burner device is detected and, in step S2.2, an oscillation frequency is selected from the detected oscillation spectrum, in particular such that the frequency spectrum at the selected oscillation frequency has a peak with respect to the oscillation amplitude.

[0114] In step S3, a flow guiding device is provided which comprises an axial flow channel for guiding through the air-fuel mixture, for which an axial length takes place in substep S3.1 as a function of the oscillation frequency selected in step S2 and on the basis of which the flow guiding device is created in substep S3.2, the axial flow channel of which has a length which corresponds to the determined axial length from substep S3.1.

[0115] In step S4, the provided flow guiding device is inserted into the interior space of the burner device.

[0116] Exemplary embodiments of the present invention and the advantages thereof have been described in detail above with reference to the accompanying figures.

[0117] It is again emphasized that the present invention is in no way limited to the exemplary embodiments described above and the exemplary features thereof. The invention furthermore comprises modifications of the exemplary embodiments mentioned, in particular those which emerge from modifications and/or combinations of the features of the exemplary embodiments described within the scope of protection of the independent claims.

LIST OF REFERENCE SIGNS

[0118] 1 Flame Body [0119] 2 Flow Guiding Device [0120] 3 Flame Barrier [0121] 11 Interior Space [0122] 12 Combustion Surface [0123] 13 Inlet Surface [0124] 21 Axial Flow Channel [0125] 22 Further Flow Channels [0126] 23 Pipe Element [0127] 24 Fin Element [0128] 100 Burner device [0129] G air-fuel mixture [0130] LA longitudinal axis fuel