CN114754378B - Gas turbine combustor structure - Google Patents
Gas turbine combustor structure Download PDFInfo
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- CN114754378B CN114754378B CN202210659852.6A CN202210659852A CN114754378B CN 114754378 B CN114754378 B CN 114754378B CN 202210659852 A CN202210659852 A CN 202210659852A CN 114754378 B CN114754378 B CN 114754378B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
Abstract
The invention discloses a combustor structure of a gas turbine, wherein a first air duct is arranged in a first air supply channel, an air inlet end and an air outlet end of the first air duct are hermetically connected with the inner wall of the first air supply channel, a duct transition section is arranged between the air inlet end and the air outlet end of the first air duct, a gas circulation gap is arranged between the duct transition section and the inner wall of the first air supply channel, and the gas circulation gap penetrates through two sides of a combustor casing; a third gas supply pipe joint is arranged on the other side of the combustor casing and communicated with the gas circulation gap; and one side of the combustor casing is provided with a bent pipe, and the bent pipe is respectively communicated with the gas circulation gap and the first swirler. The invention meets the requirement of multi-path gas supply of the burner under the condition of compact structure and limited space, fully utilizes the existing spatial layout of the burner, is convenient to adjust the gas supply state of the burner and improves the combustion performance of the combustion chamber.
Description
Technical Field
The invention belongs to the technical field of gas turbines, and particularly relates to a gas turbine combustor structure.
Background
The Gas Turbine (Gas Turbine) is an internal combustion type power machine which takes continuously flowing Gas as a working medium to drive an impeller to rotate at a high speed and converts the energy of fuel into useful work, and is a rotary impeller type heat engine.
The gas turbine combustor air supply pipeline at the present stage generally adopts a single axial pipeline, and is a structure capable of supplying one path of gas, because in the existing gas turbine structure, the structure of the inner space is compact, the number of the air supply pipelines is difficult to increase under the condition of compact structure space, if the air supply pipelines are divided into a plurality of paths, the split-flow can be realized by using a three-way structure, but the on-off of the fuel supply after the split-flow can not be controlled after the three-way structure is split, unless the valve control is added, and if the air supply state of the combustor needs to be adjusted, the combustion performance of the combustion chamber is improved, and the scheme has certain limitation.
Disclosure of Invention
It is an object of the present invention to provide a gas turbine combustor configuration that addresses the above-identified problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a gas turbine combustor structure comprises a combustor body, wherein a first swirler and a second swirler which are positioned on one side of a combustor casing are arranged on the combustor body, a first gas supply channel for supplying gas to the first swirler and a second gas supply channel for supplying gas to the second swirler are also arranged on the combustor body, and a gas inlet of the first gas supply channel and a gas inlet of the second gas supply channel are both arranged on the other side of the combustor casing; a first air duct is arranged in the first air supply channel, the air inlet end and the air outlet end of the first air duct are hermetically connected with the inner wall of the first air supply channel, a duct transition section is arranged between the air inlet end and the air outlet end of the first air duct, a gas circulation gap is arranged between the duct transition section and the inner wall of the first air supply channel, and the gas circulation gap penetrates through two sides of the combustor casing; a third gas supply pipe joint is arranged on the other side of the combustor casing and communicated with the gas circulation gap; and one side of the combustor casing is provided with a bent pipe, and the bent pipe is respectively communicated with the gas circulation gap and the first swirler.
In the technical scheme, the three-way gas supply function is provided under the conditions of meeting the requirement of multi-way gas supply of the burner and having a compact structure and limited space, the existing spatial layout of the burner is fully utilized, the three-way gas supply is provided under the limitation of space, and the gas supply quantity of each pipeline is also met.
Specifically, a first air duct is arranged in the first air supply channel, an air inlet end and an air outlet end of the first air duct are hermetically connected with the inner wall of the first air supply channel, so that the air tightness of the first air supply channel during air supply is ensured, a duct transition section is arranged between the air inlet end and the air outlet end of the first air duct, and an air circulation gap is formed between the duct transition section and the inner wall of the first air supply channel, so that an independent air circulation channel can be formed in the air circulation gap, the air circulation gap penetrates through two sides of the combustor casing, a third air supply pipe joint is arranged on the other side of the combustor casing and is communicated with the air circulation gap, air can be supplied to the air circulation gap through the third air supply pipe joint and is matched with the first air supply channel and the second air supply channel to form three paths of air supply to the combustor; one side of combustor machine casket is provided with the return bend, and the return bend communicates gas circulation clearance and first swirler respectively, and the third gas supply pipe connects the gas supply to gas circulation clearance, and gas in the gas circulation clearance passes through in the return bend flows into first swirler, and then realizes the gas supply to first swirler to the convenience is adjusted the combustor air feed state, promotes combustion chamber combustion performance.
As a preferable technical solution of the present invention, the third air supply pipe joint is integrally formed with or welded to the burner body, and both of the two manners can ensure airtightness between the third air supply pipe joint and the burner body.
As a preferred technical solution in the present invention, the first swirler and the burner body on the side of the gas flow gap are both provided with an elbow connection portion, the elbow connection portion is provided with a connection hole, and two ends of the elbow are respectively welded in the corresponding connection holes.
In above-mentioned technical scheme, guarantee the stable connection of return bend and combustor body through the welded mode to and the gas tightness between the structure, and then stability when guaranteeing the air feed.
As a preferred technical scheme, the end part of the bent pipe is in transition fit or interference fit with the connecting hole, an annular brazing filler metal filling groove is formed in the outer wall of the end part of the bent pipe, annular welding grooves which are convenient for connecting the bent pipe and the connecting hole are formed in two sides of the brazing filler metal filling groove, and strip-shaped brazing filler metal for welding is filled between the brazing filler metal filling groove and the inner wall of the connecting hole.
In above-mentioned technical scheme, transition fit or interference fit between the tip of return bend and the connecting hole, further strengthen the gas tightness between the tip of return bend and the connecting hole, also more stable when the welding simultaneously, annular welding groove is as the welding clearance of reservation, pack banded brazing filler metal between the inner wall of brazing filler metal filling groove and connecting hole, material when banded brazing filler metal is as the welding, combine transition fit or interference fit between return bend tip and the connecting hole, can prevent that banded brazing filler metal from flowing out the annular owing to capillary effect after melting, and then guarantee the sealed effect after the welding.
As a preferable technical scheme in the invention, when the end part of the elbow is in transition fit with the connecting hole, the clearance between the outer wall of the elbow and the inner wall of the connecting hole is not more than 0.01 mm.
As a preferable technical scheme in the invention, the distance between the inner bottom surface of the annular welding groove and the inner wall of the connecting hole is 0.1mm +/-0.03 mm.
As a preferable technical scheme in the invention, the distance between the inner bottom surface of the brazing filler metal filling groove and the inner wall of the connecting hole is 0.5-0.7 mm.
In a preferred embodiment of the present invention, the thickness of the brazing filler metal ribbon is 0.5 mm.
In a preferred embodiment of the present invention, the width of the brazing filler metal filling groove is equal to the width of the band-shaped brazing filler metal, and the width of the brazing filler metal filling groove and the width of the band-shaped brazing filler metal are not greater than 10 mm.
As a preferable aspect of the present invention, the ratio of the volume of the brazing filler metal strip before welding to the sum of the volumes of the two annular welding grooves is in the range of 0.9 to 5.
In the technical scheme, the proportion range of the volume of the strip-shaped brazing filler metal before welding and the sum of the volumes of the two annular welding grooves is 0.9-5, so that the gaps of the welded parts can be filled as much as possible, the brazing filler metal is not sufficiently filled due to insufficient supply of the brazing filler metal when the proportion is less than 0.9, the welding tightness and the welding strength are not up to the standard, and the wall thickness of the inner pipe is increased when the proportion is more than 5.
Has the advantages that: the structure of the invention provides three air supply functions under the conditions of meeting the requirement of multi-path air supply of the burner and compact structure and limited space, and fully utilizes the existing spatial layout of the burner, thereby not only providing three air supplies under the limitation of space, but also meeting the air supply quantity of each pipeline.
Specifically, the first air supply channel is internally provided with a first air duct, the air inlet end and the air outlet end of the first air duct are hermetically connected with the inner wall of the first air supply channel, so that the air tightness of the first air supply channel during air supply is ensured, a duct transition section is arranged between the air inlet end and the air outlet end of the first air duct, and a gas circulation gap is formed between the duct transition section and the inner wall of the first air supply channel, so that an independent gas circulation channel can be formed in the gas circulation gap, the gas circulation gap penetrates through two sides of the combustor casing, a third air supply pipe connector is arranged on the other side of the combustor casing and is communicated with the gas circulation gap, the air can be supplied to the gas circulation gap through the third air supply pipe connector and is matched with the first air supply channel and the second air supply channel to form a three-way gas supply combustor; one side of combustor machine casket is provided with the return bend, and the return bend communicates gas circulation clearance and first swirler respectively, and the third gas supply pipe connects the gas supply to gas circulation clearance, and gas in the gas circulation clearance passes through in the return bend flows into first swirler, and then realizes the gas supply to first swirler to the convenience is adjusted the combustor air feed state, promotes combustion chamber combustion performance.
Drawings
FIG. 1 is a cross-sectional view of a gas turbine combustor configuration of the present invention;
FIG. 2 is a schematic perspective view of the gas turbine combustor configuration of the present invention;
FIG. 3 is a schematic view of the end of the elbow of the present invention prior to vacuum welding in the connecting hole of the connecting portion of the elbow;
FIG. 4 is a schematic view of the end of the elbow pipe of the present invention after vacuum welding in the connecting hole of the elbow pipe connecting portion.
In the figure: 1-a burner body; 101-a combustor case; 102-a first cyclone; 103-a second cyclone; 104-a first gas supply channel; 105-a second gas supply channel; 106-gas flow gap; 107-elbow connection; 2-a first vent conduit; 3-a third gas supply pipe joint; 4-bending the pipe; 401-solder filling grooves; 402-annular weld groove.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly described below with reference to the accompanying drawings and the embodiments or the description of the prior art, it is obvious that the following description of the structure of the drawings is only some embodiments of the present invention, and it is also possible for those skilled in the art to obtain other drawings based on the drawings without creative efforts. It should be noted that the description of the embodiments is provided to help understanding of the present invention, and the present invention is not limited thereto.
The first embodiment is as follows:
as shown in fig. 1 and fig. 2, the present embodiment provides a gas turbine combustor structure, which includes a combustor body 1, the combustor body 1 is provided with a first swirler 102 and a second swirler 103 located on one side of a combustor casing 101, the combustor body 1 is further provided with a first air supply channel 104 for supplying air to the first swirler 102 and a second air supply channel 105 for supplying air to the second swirler 103, in practice, the original air supply pipe joints are reserved on the first air supply channel 104 and the second air supply channel 105, the first air supply channel 104 and the second air supply channel 105 are two main air supply pipelines, and the air inlet of the first air supply channel 104 and the air inlet of the second air supply channel 105 are both arranged on the other side of the combustor casing 101, which is the same as the structure in the prior art and is not modified.
A first air duct 2 is arranged in the first air supply channel 104, the air inlet end and the air outlet end of the first air duct 2 are hermetically connected with the inner wall of the first air supply channel 104, the air tightness of the first air supply channel 104 during air supply is ensured, the sealing connection between the inlet end and the outlet end of the first vent pipe 2 and the inner wall of the first vent pipe 2 can be performed in many ways, such as welding the inlet end and the outlet end of the first vent pipe 2 directly into the first vent pipe 2, or the air inlet end and the air outlet end of the first vent pipe 2 are directly and integrally formed, or a sealing ring and the like are arranged between the air inlet end and the air outlet end of the first vent pipe 2 and the inner wall of the first vent pipe 2, so that the air inlet end and the air outlet end of the first vent pipe 2 are hermetically connected with the inner wall of the first vent pipe 2, and therefore, the specific sealing mode in the embodiment is not limited specifically.
Specifically, a pipeline transition section is arranged between the air inlet end and the air outlet end of the first ventilation pipeline 2, an air circulation gap 106 is arranged between the pipeline transition section and the inner wall of the first air supply channel 104, the air circulation gap 106 is actually an annular air circulation channel, so that an independent air circulation channel can be formed in the air circulation gap 106, the air circulation gap 106 penetrates through two sides of the combustor casing 101, and the subsequent installation of the third air supply pipe joint 3 and the elbow 4 is facilitated, so that a complete air supply flow path is formed.
Specifically, a third gas supply pipe joint 3 is arranged on the other side of the burner casing 101, the third gas supply pipe joint 3 is communicated with the gas circulation gap 106, gas can be supplied to the gas circulation gap 106 through the third gas supply pipe joint 3, and the third gas supply pipe joint is matched with the first gas supply channel 104 and the second gas supply channel 105 to form three paths of gas supply to the burner; one side of combustor machine casket 101 is provided with return bend 4, and return bend 4 communicates gas circulation clearance 106 and first swirler 102 respectively, and third gas supply coupling 3 is to gas circulation clearance 106 gas supply, and the gas in the gas circulation clearance 106 flows into in the first swirler 102 through return bend 4, and then realizes the gas supply to first swirler 102 to in the convenience of adjusting combustor gas supply state, promote the combustion chamber performance.
The structure of the invention provides three-way air supply function under the condition of meeting the requirement of multi-way air supply of the burner and having compact structure and limited space, and fully utilizes the existing spatial layout of the burner, thereby not only providing three-way air supply under the limitation of space, but also meeting the air supply quantity of each pipeline.
Specifically, the first air duct 2 is arranged in the first air supply channel 104, the air inlet end and the air outlet end of the first air duct 2 are hermetically connected with the inner wall of the first air duct 2 to ensure the air tightness when the first air supply channel 104 supplies air, a duct transition section is arranged between the air inlet end and the air outlet end of the first air duct 2, a gas circulation gap 106 is formed between the duct transition section and the inner wall of the first air supply channel 104, so that an independent gas circulation channel can be formed in the gas circulation gap 106, the gas circulation gap 106 penetrates through two sides of the burner case 101, a third air supply pipe joint 3 is arranged on the other side of the burner case 101, the third air supply pipe joint 3 is communicated with the gas circulation gap 106, the third air supply pipe joint 3 can supply air to the gas circulation gap 106 and is matched with the first air supply channel 104 and the second air supply channel 105, forming three paths of gas to be supplied to a burner; an elbow 4 is arranged on one side of the burner casing 101, the elbow 4 is respectively communicated with the gas circulation gap 106 and the first swirler 102, the third gas supply pipe joint 3 supplies gas to the gas circulation gap 106, and the gas in the gas circulation gap 106 flows into the first swirler 102 through the elbow 4, so that the gas supply to the first swirler 102 is realized, the gas supply state of the burner is conveniently adjusted, and the combustion performance of the combustion chamber is improved.
As a preferred embodiment in this embodiment, it should be further explained that the third gas supply pipe joint 3 is integrally formed with the burner body 1 or welded to the burner body 1, and both of them can ensure the airtightness between the third gas supply pipe joint 3 and the burner body 1.
Example two:
the present embodiment is a further improvement on the basis of the first embodiment, and specific differences between the present embodiment and the first embodiment are as follows:
as shown in fig. 3 and 4, as a preferred technical solution of the present invention, it should be further explained that the burner body 1 on the side of the first cyclone 102 and the gas flowing gap 106 is provided with an elbow connection portion 107, the elbow connection portion 107 is provided with a connection hole, two ends of the elbow 4 are respectively welded in the corresponding connection holes, and stable connection between the elbow 4 and the burner body 1 and airtightness between structures are ensured by welding, so as to ensure stability during gas supply.
It should be noted that, in the current stage, the end face of the gas turbine pipe joint is generally filled with brazing filler metal in the vacuum brazing process, the brazing filler metal is exposed on the outer surface, and after the brazing filler metal is melted at high temperature, the brazing filler metal is guided into a gap of the pipe joint by means of gravity and capillary effect, so that the gap is filled to complete welding. In addition, flow resisting agent is coated to prevent the brazing filler metal from flowing to the other direction after melting. After welding, because the gaps are not uniform, the flowing direction of the brazing filler metal is unstable, and the brazing filler metal is influenced by factors such as the quantity of the brazing filler metal, welding seam defects exist after welding, most commonly, welding breakpoints exist in the circumferential direction of the pipe fitting, and sealing is not formed. If a plurality of welding seams exist in the welding process of one pipe fitting, the welding seams in multiple directions can be placed in the welding direction, and the filling amount of the welding flux has higher requirements.
Therefore, summarizing the existing welding structure, although the structure is relatively simple, the following disadvantages exist: 1. the welding qualification rate is relatively low, the filling of brazing filler metal at the welding position is uneven, and the welding strength is relatively low; 2. the placing direction needs to consider the flowing direction of the brazing filler metal during welding, and is preferably consistent with the gravity direction; 3. the utilization rate of the brazing filler metal is low, and most of the brazing filler metal cannot flow into the gaps. In view of the above problems, various welding structures are provided in the present embodiment to solve the above problems.
Specifically, as a preferred embodiment in this embodiment, it needs to be further noted that the end of the elbow 4 is in transition fit or interference fit with the connecting hole, so as to further enhance the air tightness between the end of the elbow 4 and the connecting hole, and meanwhile, the welding is more stable, when the end of the elbow 4 is in transition fit with the connecting hole, the gap between the outer wall of the elbow 4 and the inner wall of the connecting hole is not greater than 0.01mm, an annular brazing filler metal filling groove 401 is arranged on the outer wall of the end of the elbow 4, annular welding grooves 402 which are convenient for connecting the elbow 4 and the connecting hole together are arranged on both sides of the brazing filler metal filling groove 401, the annular welding grooves 402 are used as reserved welding gaps, a strip-shaped brazing filler metal for welding is filled between the brazing filler metal filling groove 401 and the inner wall of the connecting hole, the strip-shaped brazing filler metal is used as a material during welding, and is combined with transition fit or interference fit between the end of the elbow 4 and the connecting hole, the strip-shaped brazing filler metal can be prevented from flowing out of the ring groove due to capillary effect after being melted, and then the sealing effect after welding is guaranteed.
The whole gas supply process of the invention is three-way gas supply from the three-way gas inlet joint to the two axial gas supply pipelines, and then three-way gas supply from the three gas outlets in the two cyclones by using the space of the conventional two channels. The first air supply channel is supplied to the first swirler, the second air supply channel is supplied to the second swirler, and the third air supply pipe joint can be supplied to the first swirler for ignition starting and duty. The third gas supply pipe joint is supplied to the elbow, and can be directly supplied to the central nozzle of the starting nozzle through the elbow, and the outlet of the third gas supply pipe joint can gradually reduce the gas supply quantity until the supply quantity reaches 0 after the combustion chamber is started stably.
Due to the structural limitation, if fuel is supplied in the combustor in three paths in an axially separated mode, the combustor has the condition of space limitation, and the problem of an air supply path is difficult to solve. The connecting structure of vacuum brazing is adopted at the bent pipe in the pipeline corresponding to the third gas supply pipe joint, the structural limitation is considered, whether the sealing requirement is met or not is difficult to judge through a pressing mode or other nondestructive testing modes due to the structural limitation, and the welding reliability is required to be higher due to certain difficulty and inaccuracy in the detection of the welding sealing effect after brazing. The bent pipe and the gas circulation gap 106 adopts an inner pipe and an outer pipe, and the welding reliability and the sealing performance are improved through a sealing structure filled with brazing filler metal.
As a preferred embodiment in this embodiment, it needs to be further noted that, a distance between an inner bottom surface of the annular welding groove 402 and an inner wall of the connecting hole is 0.1mm ± 0.03mm, and a gap of 0.07mm to 0.13mm, preferably 0.1mm, is reserved between the inner wall of the connecting hole and the inner bottom surface of the annular welding groove 402, and is used for a welding position after the brazing filler metal is melted, the annular welding groove 402 may be manufactured by mechanical processing, the size of the gap is relatively stable, the surface finish is high, an outer ring groove is formed on the elbow 4 to facilitate filling of the strip-shaped brazing filler metal, and in an actual application process, it can also be proved that the gap of 0.1mm is most suitable for flowing under the capillary effect of the brazing filler metal.
As a preferred embodiment in this embodiment, it needs to be further explained that the distance between the inner bottom surface of the solder filling groove 401 and the inner wall of the connecting hole is 0.5 to 0.7mm, the thickness of the band-shaped solder is required to be 0.5mm, the width of the solder filling groove 401 is equal to the width of the band-shaped solder, and the width of the solder filling groove 401 and the width of the band-shaped solder are not greater than 10mm, which is more beneficial for the solder to flow into the gaps on both sides after melting at high temperature.
As a preferred embodiment in this embodiment, it needs to be further noted that, in order to ensure that the volume amount of the brazing filler metal fills the gap at the welding position as much as possible, the ratio of the volume of the strip-shaped brazing filler metal before welding to the sum of the volumes of the two annular welding grooves 402 is in a range of 0.9 to 5, when the ratio is less than 0.9, the brazing filler metal is not sufficiently filled due to insufficient supply of the brazing filler metal, so that the welding tightness and strength are not up to the standard, and when the ratio is greater than 5, the inner pipe wall thickness is increased. As shown in fig. 4, the brazing filler metal flows into the gaps at two sides under the capillary effect after vacuum brazing, the position of the parts can be randomly placed during brazing, a flow resisting agent is not needed to be coated, the influence of the gravity direction is avoided, the utilization rate of the brazing filler metal is high, and the surface of the brazing filler metal is more attractive compared with the surface of the existing welding structure.
Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A gas turbine combustor structure comprises a combustor body (1), wherein a first swirler (102) and a second swirler (103) which are positioned on one side of a combustor casing (101) are arranged on the combustor body (1), a first gas supply channel (104) for supplying gas to the first swirler (102) and a second gas supply channel (105) for supplying gas to the second swirler (103) are also arranged on the combustor body (1), and a gas inlet of the first gas supply channel (104) and a gas inlet of the second gas supply channel (105) are both arranged on the other side of the combustor casing (101); the combustor is characterized in that a first ventilation pipeline (2) is arranged in the first gas supply channel (104), a gas inlet end and a gas outlet end of the first ventilation pipeline (2) are hermetically connected with the inner wall of the first gas supply channel (104), a pipeline transition section is arranged between the gas inlet end and the gas outlet end of the first ventilation pipeline (2), a gas circulation gap (106) is arranged between the pipeline transition section and the inner wall of the first gas supply channel (104), and the gas circulation gap (106) penetrates through two sides of the combustor casing (101); a third gas supply pipe joint (3) is arranged on the other side of the burner casing (101), and the third gas supply pipe joint (3) is communicated with a gas circulation gap (106); an elbow (4) is arranged on one side of the combustor casing (101), and the elbow (4) is respectively communicated with the gas circulation gap (106) and the first swirler (102).
2. A gas turbine burner arrangement according to claim 1, wherein the third gas supply pipe connection (3) is formed integrally with the burner body (1) or welded to the burner body (1).
3. A gas turbine burner structure according to claim 1, wherein the burner body (1) on the side of the first swirler (102) and the gas flow gap (106) is provided with an elbow connection portion (107), the elbow connection portion (107) is provided with a connection hole, and both ends of the elbow (4) are respectively welded in the corresponding connection holes.
4. A gas turbine combustor structure according to claim 3, wherein the end of the elbow (4) is in transition fit or interference fit with the connecting hole, an annular brazing filler metal filling groove (401) is formed in the outer wall of the end of the elbow (4), annular welding grooves (402) for connecting the elbow (4) and the connecting hole together are formed in both sides of the brazing filler metal filling groove (401), and a welding ribbon-shaped brazing filler metal is filled between the brazing filler metal filling groove (401) and the inner wall of the connecting hole.
5. A gas turbine burner structure according to claim 4, characterized in that the clearance between the outer wall of the elbow (4) and the inner wall of the attachment hole is not more than 0.01mm when the end of the elbow (4) is in transitional engagement with the attachment hole.
6. A gas turbine combustor configuration according to claim 4, wherein the distance between the inner bottom surface of the annular weld groove (402) and the inner wall of the attachment hole is 0.1mm ± 0.03 mm.
7. A gas turbine combustor structure according to claim 6, wherein a distance between an inner bottom surface of the brazing filler metal filling groove (401) and an inner wall of the joining hole is 0.5 to 0.7 mm.
8. The structure of a gas turbine combustor according to claim 7, wherein the brazing filler metal ribbon has a thickness of 0.5 mm.
9. A gas turbine combustor structure according to claim 7, wherein the brazing filler metal filling groove (401) has a width equal to that of the brazing filler metal strip, and the width of the brazing filler metal filling groove (401) and the width of the brazing filler metal strip are not more than 10 mm.
10. A gas turbine burner structure according to claim 4, wherein the ratio of the volume of the brazing filler metal ribbon before welding to the sum of the volumes of the two annular welding grooves (402) is in the range of 0.9 to 5.
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