Heat exchanger burner base unit and heat exchanger burner
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- KUSOL ADDITIVES LLC
- Filing Date
- 2024-09-27
- Publication Date
- 2026-06-19
Smart Images
Figure CN122249674A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a heat exchanger burner base unit having the features of the preamble of claim 1. Background Technology
[0002] This heat exchanger-type burner base unit constitutes the basic component module of the heat exchanger-type burner, and then it is especially necessary to add burner tubes and burner nozzles located in the burner tubes.
[0003] EP 4 105 552 A1 discloses a heat exchanger-type burner base unit with a heat exchanger having a heat transfer body with a complex geometry in which the heat transfer surface between two internal air and exhaust gas flow channels is maximized. This geometry can only be manufactured using additive manufacturing processes. This heat transfer body results in significantly improved heat transfer performance. However, the pot-shaped burner base, with its connections for at least two media (i.e., combustion air and exhaust gas) and the flow paths formed therein, is designed to be very large, making integral molding using additive manufacturing processes correspondingly time-consuming and costly. Summary of the Invention
[0004] Therefore, the object of the present invention is to realize the production of a more cost-effective heat exchanger burner base unit.
[0005] This objective is achieved in each case by a heat exchanger-type burner base unit having the features of claim 1.
[0006] The core element of the heat exchanger-type burner base unit according to the present invention is a flat burner base element as part of the burner base, comprising at least one air passage opening, at least one exhaust gas passage opening, and at least one opening. The at least one air passage opening is used to connect the combustion air interface to a flow channel in the heat exchanger, the at least one exhaust gas passage opening is used to connect to the exhaust gas interface, and the at least one opening is used to connect to the combustion gas interface. The heat exchanger and the burner base element are integrally connected to form a single unit, wherein the flow paths within or on the heat exchanger are directly incorporated into the openings of the burner base element. More broadly, the present invention proposes to print the heat exchanger onto the support surface of the burner base element, that is, particularly using additive manufacturing processes (e.g., selective laser melting (SLM)) to print the heat exchanger onto the support surface of the burner base element.
[0007] A flat burner base element allows for the simple and cost-effective fabrication of the required openings. This flat burner base element replaces the printing plate in a 3D printer, or its seat plane is placed on top of the printing plate. To enable the heat exchanger to be built layer by layer onto the burner base element, at least one support surface is formed on the front side, and a seat plane parallel to the support surface is provided on the back side, or a seat plane parallel to the support surface can be formed on the back side.
[0008] The supporting surface may consist at most the entire front side, or at least a narrow strip of the surface to be constructed, while the rest of the front side remains untreated. Multiple supporting surfaces may also be provided, either lying in the same plane or staggered and parallel to each other along the Z-coordinate direction.
[0009] A seat plane parallel to the support surface is formed on the back side of the burner base element. This can be achieved, for example, by milling or grinding the entire back side to make it completely parallel to the support surface. However, it is equally sufficient to provide three support points on the back side, which are located in the seat plane parallel to the support surface.
[0010] Finally, it can also be configured to combine the burner base element with at least one adapter element, thereby enabling it to be placed in the additive manufacturing machine in such a way that the support surface is parallel to the machine bed or another reference plane of the manufacturing machine.
[0011] The burner base is the part that is placed outside the furnace wall during installation, while the heat exchanger and burner tubes pass through the furnace wall and extend into the furnace.
[0012] In a preferred embodiment of the invention, the burner base consists only of burner base elements and connectors attached to the burner base elements for combustion gas, exhaust gas, and combustion air piping. Eliminating any other housing components from the burner base enables particularly cost-effective production of heat exchanger-type burner base units.
[0013] However, the flat burner base element can also be used as an intermediate component arranged near the furnace wall, with other modules for combustion gas, exhaust gas and airflow connected to this intermediate component.
[0014] A particular advantage in terms of production costs stems from the fact that the dimensions of the burner base elements are optimized to allow multiple heat exchanger burner base units to be produced side-by-side in an additive manufacturing machine. For this purpose, the burner base elements are rectangular, and particularly square, with the distance between the edges of the burner base elements being approximately the same as the extension dimension of the heat transfer element in that direction.
[0015] For example, if the heat transfer medium has a cylindrical envelope, then the inscribed circle of a square burner base element is essentially the same diameter as that envelope, possibly with a small margin. This allows multiple burner base elements to be placed close together, and multiple heat exchangers to be tightly assembled using 3D printing.
[0016] Alternatively, hexagonal burner base elements can be used, enabling the creation of multiple rows of base units arranged in a staggered manner to better utilize the bottom area of the additive manufacturing machine.
[0017] In terms of space optimization, the following conditions are particularly advantageous:
[0018] - There is a material bond between the support surface and the inner tube of the heat exchanger along a closed inner line, within which at least one recess is formed on the burner base element for guiding through or connecting at least one combustion gas pipeline.
[0019] - There is a material bond between the support surface and the heat exchanger along the centerline of the first closed section, and
[0020] - At least one exhaust gas passage opening is arranged between the inner line and the first center line, and at least one air passage opening is located between the first center line and the second center line.
[0021] Additive manufacturing along these closed lines automatically creates sealed channels leading to the heat exchanger, eliminating the need for additional seals.
[0022] Alternatively, the air intake opening can be located outside the centerline, while the exhaust intake opening is located between the inner line and the centerline.
[0023] It may also be advantageous if the inner line extends parallel to the center line. This creates a flow channel (e.g., a flow channel for guiding burner air) with a constant cross-section in the circumferential direction.
[0024] In another advantageous embodiment of the invention, both the inner line and the center line are circular. This results in a simple and space-saving configuration.
[0025] To minimize the footprint of the burner base element while still providing a large flow cross-section for burner air and exhaust gas, the preferred embodiment of the heat exchanger-type burner base unit specifies:
[0026] - The inner line is circular;
[0027] - The distance between the inner line and the middle line in at least one segment is less than the diameter of the gas passage opening located between the inner line and the middle line;
[0028] - The distance between the inner line and the segment of the centerline located at the gas conduction opening is at least equal to the diameter of the gas conduction opening; and
[0029] - The centerline is arc-shaped around the periphery of the gas conduction opening in this section, and connects to the arc-shaped section through a further tangential section.
[0030] Specifically, it can be specified that the centerline extends along an arc-shaped section parallel to the periphery of another gas passage opening in the burner base element and converges toward the inner line.
[0031] The proximity of the inner and middle lines can be so great that a section of the middle line at the gas passage opening is guided to and connect with the inner line, thereby interrupting the flow path and preventing circulation. This reduces lateral flow in the heat exchanger and forces the flow to proceed longitudinally along the flow path that runs through the heat exchanger.
[0032] The spatially optimized layout on the burner base element can be further simplified by arranging two gas passage openings (i.e., exhaust gas passage opening and air passage opening) on the same nodal circle, with the center of the nodal circle located at the center of the inner line of the circle.
[0033] Preferably, the central region within the inner line is used for the conduction of at least one combustion gas line, particularly two combustion gas lines (e.g., combustion gas lines for methane and hydrogen), thereby enabling the burner to operate using different energy sources or in a mixed mode.
[0034] In addition, further conductive parts may be provided in this area, such as openings for bypass pipelines and / or ignition electrodes and / or sensor elements for flame monitoring.
[0035] A particular advantage is that the area within the inner wire is constructed in an insert element that can be detached from the burner base element, so that the cable attached to the insert element can be pulled out of the burner from outside the furnace.
[0036] In addition to the two separate walls provided in the preferred embodiment, additional circumferential walls may be formed along other circumferential lines.
[0037] For example, the heat transfer element of the heat exchanger may be provided with an outer sheath formed by material bonding, and an additional circumferential line may be provided outside the centerline, on which the outer sheath is connected to the burner base element by material bonding.
[0038] The outer sheath located on the circumferential line can form an intermediate tube through which the burner base element, together with the end section of the heat exchanger, is moved from the furnace wall to the outside. In this case, the exhaust gas is not drawn in directly at the exhaust gas intake opening, but is drawn in via an additional exhaust gas duct formed between the centerline and the circumferential line.
[0039] To reduce flow obstruction, it may be advantageous to design the area where the exhaust gas duct and air duct transition into the burner base element as annular or approximately trapezoidal recesses in the burner base element. These recesses are then merged into a circular connection portion attached to the rear gas connection flange, thereby facilitating the attachment of fittings for connecting external piping.
[0040] It may also be advantageous to provide a pair of circumferential lines outside the centerline, allowing the heat exchanger to be additionally integrated with the burner base element at that location, and to provide at least one medium passage opening in the burner base element between the pair of circumferential lines. This creates another flow channel between the pair of circumferential lines, through which heat transfer oil can be introduced into the heat exchanger, for example. Attached Figure Description
[0041] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings. The accompanying drawings show in detail:
[0042] Figure 1 A perspective view of the heat exchanger burner base unit is shown;
[0043] Figure 2 A perspective view of the front side of the burner base element is shown;
[0044] Figure 3 A cross-sectional view of the heat exchanger is shown at the area where it connects to the burner base element;
[0045] Figure 4 A perspective view of the heat exchanger burner base unit as seen from behind is shown;
[0046] Figure 5 A perspective view of the rear side of the burner base element is shown;
[0047] Figure 6 A perspective view of the rear side of a heat exchanger burner, viewed from an oblique rear angle, is shown.
[0048] Figure 7 A cross-sectional view of the rear section of a heat exchanger burner is shown.
[0049] Figure 8 A top view of a first embodiment of a grid-like production layout is shown;
[0050] Figure 9A top view of a second embodiment of the grid-like production layout is shown;
[0051] Figure 10 An exploded perspective view of another embodiment of the heat exchanger type burner base unit is shown;
[0052] Figure 11 It shows according to Figure 10 A perspective view of the front side of the burner base element;
[0053] Figure 12 It shows according to Figure 10 and Figure 11 A top view of the front side of the burner base element;
[0054] Figure 13 A rear perspective view of a burner base element according to another embodiment is shown;
[0055] Figure 14 It shows according to Figure 13 A top view of the front side of the burner base element; and
[0056] Figure 15 , Figure 16 It shows according to Figure 13 and Figure 14 A cross-sectional view of the heat exchanger burner base unit in staggered cutting planes. Detailed Implementation
[0057] Figure 1 A perspective view of a heat exchanger-type burner base unit 100 is shown. This unit (as a single unit) includes a burner base 1 and an adjacent heat exchanger 20, with only the flat burner base element 10 visible. The heat exchanger 20 is integrally connected to the burner base element 10. The connection is achieved via a transition body 22 on the heat exchanger 20, which adapts to the geometry of the burner base element 10 and its contained connections, holes, and channels, allowing the transition body 22 and other parts of the heat exchanger 20 to be directly printed onto the flat support surface 10.3 on the front side 10.1 of the burner base element 10 in an additive manufacturing process. For this purpose, the profile of the transition body 22 at its connection with the support surface 10.3 on the burner base element 10 is specially designed.
[0058] like Figure 1 It can also be seen that a first gas passage opening 13 is recessed on the transition body 22, that is, the outer wall of the transition body 22 is concave at this point, so that the entire cross-section of the gas passage opening 13 remains exposed. Preferably, the exhaust gas pipeline is connected to the first gas passage opening. This allows exhaust gas to be drawn directly from the combustion chamber via the burner base element 10.
[0059] Above the transition body 22, the heat transfer body 21 is connected to the heat exchanger 20, with only the cylindrical outer wall of the heat transfer body 21 visible. The interior of the heat transfer body 21 has a complex geometry that maximizes the heat exchange surface size between the airflow channel and the exhaust gas flow channel, and can only be manufactured using additive manufacturing processes. Exhaust gas is first introduced into the heat transfer body 21 from the combustion chamber through the exhaust gas intake opening 28, and then discharged at the bottom of the transition body 22, subsequently exiting from the bottom of the transition body 22 through the exhaust gas conduction opening 13.
[0060] Combustion air is introduced into another flow channel in the heat transfer body 21 through another gas passage in the burner base element 10. In this other flow channel, the combustion air flows in the opposite direction to the exhaust gas flow and is heated by the exhaust gas flow. The combustion air is discharged through the annular gap 25, where the combustion air acts as a jet pump, thereby promoting the exhaust gas to be drawn into the exhaust gas intake opening 28. In the illustrated embodiment, the heat transfer body 21 has an inner tube 26 with an inner cavity 27 inside.
[0061] Figure 2 A perspective view of the front side 10.1 of the burner base element 10 is shown. At least one internal region has a flat surface that serves as a support surface 10.3 for additive manufacturing processes. The profile of the support surface 10.3 may correspond to or be larger than the centerline 24 of the outer wall of the transition body 22. The inner tube 26 of the heat exchanger 20 (see...) Figure 1 The inner wire 23 is connected to the burner base element 10.
[0062] In the preferred embodiment shown, the burner base element 10 has a special hole layout:
[0063] - The first gas passage opening 13 formed by the through hole serves as an exhaust gas passage opening in the illustrated embodiment. The first gas passage opening is located outside the centerline 24.
[0064] - Another gas passage opening 14 is located between the inner line 23 and the middle line 24 and serves as an air passage opening.
[0065] - Additional gas passage openings in the burner base element 10 form combustion gas conduits 11 and 12. These combustion gas conduits are used to selectively or simultaneously supply methane and hydrogen into the combustion chamber. Combustion gas conduits 11 and 12 originate from boreholes drilled in the side surface of the burner base element 10 and terminate at the front 10.1, within the inner line 23.
[0066] - Additional through-holes 15, 16 allow ignition elements and / or sensors to pass through to the inner tube 26 of the heat transfer body 21, or can serve as bypass lines for fresh air to temporarily bypass the air passage through the heat transfer body 21.
[0067] - Mounting hole 18 is located in the corner area outside the centerline 24. The mounting hole is used to connect the heat exchanger burner base unit 100 to the furnace flange.
[0068] - Additional mounting holes 19 are located within the inner line 23. These additional mounting holes are used to secure a burner insert element that carries at least one combustion gas line and to which a burner nozzle is attached.
[0069] In the illustrated embodiment, the inner line 23 surrounding the through holes 15, 16, 17, and 18 is circular. The center line 24 is arc-shaped only in sections 24.1 and extends parallel to the inner line 23 only in those sections 24.1 near the outer mounting hole 18.
[0070] At the exhaust gas duct opening 13, the outer line 24 is concave and offset inward in section 24.2. The outer line can even selectively connect with the inner line 23. In section 24.3, opposite in diameter, the outer line extends around the gas duct opening 14 for combustion air, which is arranged between the inner line 23 and the center line 24. Here, the distance between the inner line 23 and the center line 24 increases to the diameter of the gas duct opening 14.
[0071] The contact between section 24.2 and inner line 23 forms a two-part air duct 29. This is in... Figure 3 It is especially clear in China that Figure 3 A cross-sectional schematic view of the heat exchanger 20 at the transition point with the burner base element 10 is shown.
[0072] The beak-shaped section 24.3 at the lower left extends around the gas passage opening 14. From there, the tangential section 24.4 extends to the arc-shaped section 24.1 on both sides. Between the convex sections 24.1 is the concave section 24.2. An air duct 29 is formed between the inner line 23 and the middle line 24. Due to the interruption at section 24.2, the air duct 29 is divided into two parts. Therefore, circulation is impossible in the air passage opening 29, and turbulence is avoided. Instead, this bifurcated structure facilitates vertical flow into the heat transfer body 21.
[0073] Figure 4 The back side 10.2 of the burner base element 10 is shown, where it is actually located Figure 4 The inner line 23 and the middle line 24 on the anterior side of the dorsal side are mirrored onto the dorsal side 10.2 for illustrative purposes only.
[0074] In the following details, the hole layout of each opening and the front side (see...) Figure 2 The hole layout on the surface is consistent:
[0075] - Gas passage opening 13 located outside the centerline 24;
[0076] - Gas conduction opening 14 located between inner line 23 and middle line 24;
[0077] - Holes 15 and 16, which serve as openings through which, for example, ignition elements and / or sensors are guided;
[0078] - Mounting hole 18 located in the corner area outside the centerline 24, and
[0079] - Mounting hole 19 located within inner line 23.
[0080] The orifice layout differs only in the combustion gas conduits 11 and 12. At the back side 10.2, the combustion gas conduits 11 and 12 begin outside the centerline 24 and terminate at the inner line 23 at the front side 10.1 (see...). Figure 2 The lateral connection is achieved by drilling holes in the side surface of the burner base element 10, and these holes are sealed.
[0081] exist Figure 4 Gas passage openings 13 and 14 are arranged on the nodal circle indicated by the dotted line. The center of this arrangement coincides with the center of the inner arc 23.
[0082] Figure 5 A heat exchanger burner 101 is shown, which is mounted on the heat exchanger burner base unit 100 described above.
[0083] The heat exchanger 20 is connected to the combustion chamber tube 40. An ejector 42 is formed at the transition between the heat exchanger 20 and the combustion chamber tube 40, and the ejector 42 is mechanically connected to the heat exchanger 20 via a connecting element 44. An annular gap opening 43 is formed in the middle, which is open to the outside, so that a portion of the exhaust gas can be re-inhaled into the combustion chamber tube 40 from the outside for afterburning. Another portion enters the flow channel in the heat transfer element 21 of the heat exchanger 20 through the exhaust gas intake opening 28.
[0084] The heat exchanger burner base unit 100 is also connected to the furnace flange 50 so that the heat exchanger burner 101 can be mounted on the furnace wall.
[0085] The connectors for the following components are directly inserted into the openings in the heat exchanger burner base unit 100:
[0086] - Two combustion gas interfaces 32, for example, for supplying methane and / or hydrogen to the burner;
[0087] - Combustion air interface 33;
[0088] - Exhaust gas extraction port 34;
[0089] - Ignition electrode 36; and
[0090] - A conduit 35 for a flame image monitoring sensor, which can also be used as a bypass conduit for combustion air to direct fresh air directly to the burner nozzle during the preheating phase and temporarily bypass the afterburning of exhaust gases.
[0091] Figure 6 A perspective view of the rear side of the heat exchanger burner, viewed from a rearward angle, is shown. It can be seen that all connecting elements for the combustion gas connections 31 and 32, the combustion air inlet 33, the exhaust gas extraction inlet 34, the conduit 35, and the ignition electrode 36 are directly screwed into designated holes in the burner base element 10. No other housing components or other accessories are required.
[0092] Figure 7 A cross-sectional view of the rear of the heat exchanger burner 101 is shown, including the burner base 1 with interfaces 31, 34, and 35. Combustion gas ducts 11 and 12 in the burner base element 10 are located in the cross-sectional plane, and fastening screws 65 are also visible, which are inserted into… Figure 4 The visible mounting hole 19 is positioned at its center. A flange 63 holds the burner insert 60 above the burner base element. Combustion gas lines 61 and 62 are connected to the flange 63. A sealing plane is formed between the flange 63 and the area on the front side 10.1 of the burner base element 10, where combustion gas lines 61 and 62 converge into combustion gas conduits 11 and 12, respectively. A burner nozzle is located at the other end of the combustion gas lines 61 and 62, which can be positioned in the end section of the burner tube 40 (see [reference]). Figure 5 The burner insert 60, as a whole, can be pushed into the cavity 27 inside the burner tube 40 and the heat exchanger until the flange plate 63 contacts the burner base element 10. This allows for quick replacement of the burner nozzle.
[0093] To simplify production and reduce production costs, it is advantageous to manufacture heat exchangers for multiple heat exchanger-type burner base units 100 in a single operation using additive manufacturing. For this purpose, the burner base elements 10 are placed in a grid arrangement 2 within a production apparatus, the grid arrangement 2 being... Figure 8 The diagram is schematically shown from a top view. The external dimensions of the heat transfer element 21 of the heat exchanger 20 are chosen so that it does not extend laterally beyond the edge of the burner base element 10, but rather maintains a small gap of at least 1 mm from the edge. Thus, multiple adjacent heat transfer elements 21 with small gaps between them can be manufactured in a single operation without fusing these heat transfer elements 21 together or requiring subsequent separation of these heat transfer elements 21.
[0094] To enable the fabrication of more heat exchanger-type burner base units on existing support surfaces in production equipment, polygonal burner base elements 10' can be used instead of the aforementioned square-profile burner base elements. For example, if a hexagonal burner base element 10' is used, then... Figure 9 The more dense grid arrangement shown 2'. The staggered arrangement of the middle row relative to the upper and lower rows allows for better utilization of available space in the production equipment.
[0095] Figure 10 A heat exchanger-type burner base unit 200 is shown, which includes a burner base element 210 and a portion of the lower section of a heat exchanger 220. For ease of illustration, in Figure 10 The heat exchanger is shown separately from the burner base element 210. In fact, the heat exchanger is 3D printed on a flat area of the burner base element 210 and thus connected to the burner base element in a material-sealed manner, or formed as an integral element including the burner base element 210 and the heat exchanger.
[0096] The heat exchanger 220 has a heat transfer element 221 with an inner cavity 227 defined by an inner tube 226. A transition body 222 is formed outside the inner tube, through which the larger diameter of the heat transfer element 221 is reduced to a smaller diameter. An annular air duct 229 is formed between the inner tube 226 and the transition body 222, through which air enters the heat transfer element 221 from a gas passage opening 213 in the burner base element 210.
[0097] In the illustrated embodiment, the burner base element 210 has an inner circular region that forms a support surface for the heat exchanger 220 at its front side 210.1 and has a central opening 215 through which combustion gas lines, ignition elements, and / or sensors can be guided to the inner tube 226 of the heat transfer element 221. Larger annular recesses form gas passage openings 213 and 214. This region is surrounded by a furnace flange 250 on its outer periphery.
[0098] A gasket 240 is inserted on the back of the burner base element 210. The gasket 240 seals the gas passage openings 213 and 214 through gasket sections 241 and 242. With regard to the central opening 215, the corresponding section of the gasket 240 does not surround the entire cross-section of the opening, but is divided into four holes, which are respectively designated for the aforementioned elements (e.g., combustion gas lines, ignition elements, and / or sensors).
[0099] At the rear, the heat exchanger-type burner base unit 200 is enclosed by a flat gas connection flange 230. The gas connection flange 230 has:
[0100] - Two combustion gas inlets are located on the outer perimeter, one of which, 231, is visible;
[0101] - Burner air inlet 233;
[0102] - Exhaust gas extraction port 234; and
[0103] - Additional recesses 235, 236 for the instrument tube and ignition electrode.
[0104] Figure 11 A perspective view of the front side 210.1 of the burner base element 210 is shown. At least one internal region located inside the external furnace flange 250 with mounting holes 251 has a flat surface, which serves as a support surface for the heat exchanger manufactured by an additive manufacturing process. The contour of the support surface corresponds to a circumferential line 225, which represents the outer wall of the transition body on the heat exchanger. The inner tubes of the heat exchanger connect to an inner line 223 on the burner base element 210. Combustion gas connections 231, 232 terminate at the center. Recesses 235, 236 are also visible at this location.
[0105] Air duct 228 and exhaust duct 229 are formed between the walls of the heat exchanger (which are constructed above lines 223, 224 and 225).
[0106] from Figure 11 As can be seen, the annular and approximately trapezoidal recesses forming gas passage openings 213 and 214 in the burner base element 210 merge into the circular combustion air inlet 233 and the circular exhaust gas extraction inlet 234 in the gas connection flange 230 attached to the rear side. The annular recesses facilitate gas entry from the gas passage opening 213 into the air duct 228, or from the exhaust gas duct 229 into the gas passage opening 214. The circular holes in the subsequent gas connection flange 230 make it easier to attach pipe fittings and other components for connecting external pipelines.
[0107] Figure 12 The front side 210.1 of the burner base element 210 is shown again in a top view. It can be clearly seen that the air duct 228 narrows at the gas passage opening 214 located on its outer side. Conversely, the exhaust duct 229 narrows at the gas passage opening 213. Since both air and exhaust gas flow into the heat exchanger from the plane shown in the figure, circulation in channels 228 and 229 is not necessary, so this narrowing does not constitute an obstacle. However, even in the narrowed areas, the air duct 228 and exhaust duct 229 are not completely interrupted. On the one hand, this avoids dead zones in the air duct 228 and exhaust duct 229 that are not flowed through; on the other hand, the walls built on lines 223, 224, and 225 can be formed with a constant wall thickness, thereby avoiding material buildup and the resulting potential problems with 3D printing.
[0108] Figure 13 A perspective view of a burner base element 310 for another embodiment of a heat exchanger type burner base unit is shown, viewed from the rear.
[0109] The burner base element 310 extends forward, i.e., toward the furnace, via an extension ring 352, which terminates at the furnace flange 350. The extension ring can be 3D printed onto the burner base element 310 along with the heat exchanger. Technically, the furnace flange 350 can also be integrally formed at the same time, but for logistical reasons, it is more advantageous to weld it on later, as the diameter, number, and pitch of the threaded connections depend on the individual furnace design.
[0110] In the illustrated embodiment, the air passage opening 313 and the exhaust gas intake opening 314 are directly disposed in the burner base element 310. A gas connection flange 330 is provided at the center of the burner base element 310, the gas connection flange 330 having a lateral combustion gas connection 331 and further passage openings 333, 334 (e.g., passage openings for ignition electrodes and inspection tubes).
[0111] The exhaust gas intake opening 314 is located on the outer side of the circumference. In order to form an opening with a larger cross-section, the burner base element 310 and the adjacent extension ring 351 are not completely circular, but each has a protruding area from the cylindrical shell surface, which is arc-shaped in cross-section.
[0112] Figure 14 The plan view of the front side 310.1 of the burner base element 310 is shown again from a top view. This front side forms the support surface for other components manufactured using 3D printing.
[0113] - Inner line 323 is used to manufacture the inner tubes of heat exchangers;
[0114] - Centerline 324 is used to manufacture the transition body that connects to the heat transfer medium;
[0115] - Formed on circumferential line 325 during manufacturing. Figure 13 The extended ring 352 is visible in the middle.
[0116] An air duct 353 is formed between the inner line 323 and the middle line 324. Combustion air drawn in from the outside enters the heat exchanger through the air duct 353 and is preheated in the heat exchanger. An exhaust gas duct 354 is formed between the inner line 324 and the circumferential line 325. Exhaust gas drawn in from the combustion chamber is discharged through the heat exchanger via the exhaust gas duct 354.
[0117] The centerline 324 is eccentrically positioned relative to the inner line 323. The circumferential line 325 is roughly centered relative to the inner line 323, but is not perfectly circular; instead, the circumferential line is further widened by a convex surface. Therefore, Figure 14 The exhaust gas duct 354 in the upper region is widened, thereby enabling the formation of a gas passage opening 314 with a larger cross-section.
[0118] The extension ring 352 is provided so that the burner base element 310 can be staggered relative to the furnace flange in the longitudinal direction.
[0119] Figure 15 This is a cross-sectional view of a heat exchanger-type burner base unit 300, which includes a burner base element 310 and a portion of a lower section of a heat exchanger 320 having a heat transfer body 321. The heat transfer body 321 transitions toward the burner base element 310 into a non-rotationally symmetric transition body 322, which extends radially outward, exceeding the radius of the opening 355 in the furnace flange 350. Only in this way... Figure 14 Only the eccentric arrangement of the centerline on which the transition body 322 is constructed, as can be seen in the diagram, can be realized.
[0120] from Figure 15 It can also be seen that the front side 310.1 of the burner base element 310, which serves as the support surface for additive manufacturing, and the back side 310.2, which serves as the support surface for the printer bed, are parallel planes. The gas connection flange 330 is sealed relative to the back side 310.2.
[0121] The furnace flange 350 is welded to the extension ring 352, which is integrally formed with the burner base element 310.
[0122] The heat exchanger 320 is not directly connected to the front side 310.1 of the burner base element 310 with its inner tube 326. Instead, a metal bellows element 329 is inserted between the two to avoid different thermal expansion between the burner base element 310 and the inner tube 326, and to avoid different thermal expansion between the burner base element 310 and the transition body 322.
[0123] Figure 16 It is relative to Figure 15 A cross-sectional view on a 45° rotated cutting plane clearly shows the location of the combustion gas conduit in the gas connection flange 330. The combustion gas conduit enters the gas connection flange 330 from the interior 327 of the inner tube 326 of the heat exchanger 320, and after being laterally deflected by 90°, opens from the combustion gas connections 331 and 332 at the side edges.
[0124] Figure Labels
[0125] 100 heat exchanger type burner base unit
[0126] 101 heat exchanger burner
[0127] 2; 2' grid pattern
[0128] 10; 10' Burner base element
[0129] 10.1 Front
[0130] 10.2 Dorsal side
[0131] 11, 12 Combustion gas conduits
[0132] 13 Gas conduction openings
[0133] 14 Gas conduction openings
[0134] 15, 16 concave parts
[0135] 18, 19 Mounting holes
[0136] 20 heat exchangers
[0137] 21 heat transfer body
[0138] 22 transition bodies
[0139] 23 inside players
[0140] 24-line
[0141] Sections of the central line in sections 24.1, 24.2, 24.3, and 24.4
[0142] 25 Annular gap
[0143] 26 inner tube
[0144] 27 Inner cavity
[0145] 28 Exhaust gas intake opening
[0146] 29 air ducts
[0147] 31, 32 Combustion Gas Connection Section
[0148] 33 Burner Air Interface
[0149] 34 Exhaust Gas Extraction Interface
[0150] 35 Conductor
[0151] 36 ignition electrodes
[0152] 40 Combustion Chamber Tube
[0153] 41 Burner Nozzle
[0154] 42 ejectors
[0155] 43 Annular gap opening
[0156] 44 connecting elements
[0157] 50-furnace flange
[0158] 60 Burner Insert
[0159] 61, 62 Combustion gas pipelines
[0160] 63 flange plate
[0161] 200 heat exchanger type burner base unit
[0162] 210 burner base element
[0163] 210.1 Front
[0164] 211, 212 Combustion gas conduits
[0165] 213, 214 Gas conduction openings
[0166] 215 Central Opening
[0167] 220 heat exchanger
[0168] 221 heat transfer body
[0169] 222 transition body
[0170] 223 inside
[0171] 224 Middle Line
[0172] 225 circumferential line
[0173] 226 inner tube
[0174] 227 inner cavity
[0175] 228 Exhaust Gas Duct
[0176] 229 Air Duct
[0177] 230 Gas Connection Flange
[0178] 231, 232 Combustion Gas Interface
[0179] 233 Burner Air Interface
[0180] 234 Exhaust Gas Extraction Interface
[0181] 235, 236 Gas conduction openings
[0182] 237, 238 concavity
[0183] 240 gasket
[0184] 241, 242 gasket sections
[0185] 250 furnace flange
[0186] 251 mounting holes
[0187] 300 heat exchanger type burner base unit
[0188] 310 burner base element
[0189] 310.1 Front
[0190] 310.2 Dorsal side
[0191] 313 Gas Conductive Opening
[0192] 314 Gas Conductive Opening
[0193] 320 heat exchanger
[0194] 321 heat transfer body
[0195] 322 transition body
[0196] 323 inside
[0197] 324 midline
[0198] 325 circumferential line
[0199] 326 inner tube
[0200] 327 inner cavity
[0201] 329 Corrugated Pipe
[0202] 330 Gas Connection Flange
[0203] 331, 332 Combustion Gas Interface
[0204] 333 Burner Air Interface
[0205] 334 Exhaust Gas Extraction Interface
[0206] 335, 336 Gas conduction openings
[0207] 337, 338 concavity
[0208] 350 furnace flange
[0209] 351 mounting holes
[0210] 352 extension ring
[0211] 353 air duct
[0212] 354 Exhaust Gas Duct
Claims
1. A heat exchanger-type burner base unit (100; 200; 300), comprising at least: - Burner base (1), which has - Burner air inlet (33; 233;) for supplying air to the burner. 313）， - Exhaust gas inlets (34; 234; 314) for drawing in exhaust gases, and - Combustion gas inlets (31, 32; 231, 232; 331, 332); - A heat exchanger (20; 220; 320) connected to the burner base (1) and having a heat transfer body (21; 221; 321) having at least two separate flow channels for guiding counter-flowing fluids, and the heat transfer body also having an inner cavity (27; 227; 327) for forming or guiding through at least one combustion gas line (31, 32); Its features are, - The burner base (1) is designed as a flat burner base element (10; 10'; 210; 310) or comprises a flat burner base element. - The burner base element (10; 10'; 210; 310) includes at least one gas passage opening (14; 214; 314) for connecting the combustion air interface (33; 233; 313) to a flow passage in the heat exchanger (20; 220; 320) and / or at least one gas passage opening (13; 213; 313) for connecting to the exhaust gas interface (34; 234; 314) and / or at least one opening for connecting to the combustion gas interface (31, 32; 231, 232; 331, 332). - In the burner base element (10; The burner base element (10'; 210; 310) has at least one flat support surface (10.3) on its front side (10.1; 210.1; 310.1) intended to be connected to the heat exchanger (20; 220; 320); and the heat exchanger (20; 220; 320) is integrally connected to at least one support surface (10.3) of the burner base element (10; 10'; 210; 310).
2. The heat exchanger-type burner base unit (100; 200; 300) according to claim 1, characterized in that, - A seat plane is formed on the back side (10.2; 310.2) of the burner base element (10; 10'; 210; 310), or the seat plane can be formed by means of at least one adapter element that can be attached to the back side (10.2; 310.2); and - On the front side (10.1; 210.1; 310.1) facing the heat exchanger (20; 120; 220), there is at least one flat support surface (10.3) parallel to the seat plane.
3. The heat exchanger burner base unit (100; 200; 300) according to claim 1 or 2, characterized in that, - The support surface (10.3) and the inner tube (26; 226; 326) of the heat exchanger (20; 120; 220) forming the inner cavity (27; 227; 327) are connected by a material seal along a closed inner line (23; 223; 323), within which at least one recess (16; 237, 238; 337, 338) is provided for guiding through or connecting at least one combustion gas pipeline (61, 62). - There is a material-sealed connection between the support surface and the heat exchanger (20; 120; 220) along the closed centerline (24; 224; 324) on the burner base element (10; 10'; 210; 310). - At least one gas passage opening (14; 214; 314) is located between the inner line (23; 223; 323) and the middle line (24; 224; 324), and at least one gas passage opening (13; 213; 313) is located outside the middle line (24; 224; 324).
4. Heat exchanger burner base unit (100; 200; 300) according to claim 3, characterized in that The gas passage opening (14; 214; 314) located between the inner line (23; 223; 323) and the middle line (24; 224; 324) serves as an air passage opening and is connected to the combustion air interface (33; 233; 333) by gas conduction. The gas passage opening (13; 213; 313) located outside the middle line (24; 224; 324) serves as an exhaust gas passage opening and is connected to the exhaust gas interface (34; 234; 334) by gas conduction.
5. The heat exchanger-type burner base unit (100; 200; 300) according to claim 3, characterized in that, - The gas passage opening (14; 214; 314) located between the inner line (23; 223; 323) and the middle line (24; 224; 324) serves as an exhaust gas passage opening and is connected to the exhaust gas inlet (34; 234; 334), and - Gas passage openings (13; 213; 313) located outside the centerline (24; 224; 324) serve as air passage openings and are connected to the combustion air interface (33; 233; 333).
6. The heat exchanger burner base unit (100) according to any one of claims 3 to 5, characterized in that, - The inner line (23) is circular. - The distance between the inner line (23) and the middle line (24) in at least one segment (24.1, 24.2) is less than the diameter of the gas passage opening (14) located between the inner line (23) and the middle line (24); - The distance between the inner line (23) and the segment (24.3) of the center line (24) located at the gas passage opening (14) is at least equal to the diameter of the gas passage opening (14), and - The centerline (24) is arc-shaped around the edge region of the gas passage opening (14) in the section (24.3) and is connected to the arc-shaped section (24.3) by another tangential section (24.4).
7. Heat exchanger burner base unit (100; 200; 300) according to any one of claims 3 to 6, characterized in that The centerline (24; 224; 324) extends in an arc along the circumference of the gas passage opening (13; 213; 313) in a segment (24.2) at the gas passage opening (13; 213; 313) located outside it, and is guided toward the direction of the inner line (23; 223; 323).
8. The heat exchanger burner base unit (100; 200; 300) according to claim 7, characterized in that, The centerline (24; 224; 324) is guided to the inner line (23; 223; 323) and connected to the inner line in a segment (24.2) at the gas passage opening (13; 213; 313).
9. The heat exchanger-type burner base unit (100; 200; 300) according to any one of claims 3 to 8, characterized in that, Within the inner line (23; 223; 323), in addition to at least one opening for connection to the combustion gas interface (31, 32; 231, 232; 331, 332), there is also an opening for bypassing the pipeline and / or the ignition electrode and / or sensor element.
10. The heat exchanger-type burner base unit (100; 200; 300) according to any one of claims 3 to 9, characterized in that, Within the inner lines (23; 223; 323), there are components capable of being drawn from the burner base element (10; The insert element removed from 10'; 210; 310) has at least one opening arranged in it for connection with the combustion gas interface (31, 32; 231, 232; 331, 332).
11. The heat exchanger-type burner base unit (100; 200; 300) according to any one of claims 3 to 10, characterized in that, - The heat transfer elements (21; 221; 321) of the heat exchanger (20; 120; 220) are surrounded by an outer sheath formed by material bonding, and - A circumferential line (225; 325) is provided outside the center line (24; 224; 324), and the outer sheath is attached to the burner base element (10;) on the circumferential line by a material bonding method. Connect 10'; 210; 310).
12. The heat exchanger burner base unit (300) according to any one of claims 3 to 12, characterized in that, The heat transfer element (321) of the heat exchanger (320) is combined into a tapered transition body (322), which terminates on the centerline (324).
13. The heat exchanger-type burner base unit (100; 200; 300) according to any one of claims 3 to 8, characterized in that, The combustion gas inlets (231, 232; 331, 332) are formed in separate combustion gas flanges (230; 330), which are connected to the back side (310.2) of the burner base element (210; 310).
14. A heat exchanger type burner (101), comprising at least: - The heat exchanger-type burner base unit (100; 200; 300) according to any of the preceding claims; and - A combustion chamber tube (40) connected to a heat exchanger (20; 120; 220) is provided with at least one burner nozzle in the combustion chamber tube (40), and at least one combustion gas line connected to a combustion gas interface (31, 32; 231, 232; 331, 332) is fluid-conductingly connected to the burner nozzle.
15. The heat exchanger burner (101) according to claim 14, characterized in that, A burner insert (60) is arranged in the inner cavity (27) of the heat exchanger (20), the burner insert (60) including at least the burner nozzle and the combustion gas pipeline, wherein the combustion gas pipeline terminates at a flange (63) which is capable of sealing relative to the front side (10.1) of the burner base element (10; 10).
Citation Information
Patent Citations
Recuperator burner with a recuperator for guiding counter-flowing fluids
EP4105552A1