Cooling micro-mixing nozzle, combustor and gas turbine

Abstract

The invention discloses a cooling micro-mixing nozzle, a combustor and a gas turbine, the cooling micro-mixing nozzle comprises a nozzle body, a gas outlet and a plurality of cooling holes are formed in the gas injection end of the nozzle body, the gas outlet is arranged to inject combustible gas, and the cooling holes are arranged to eject cooling air to cool the gas injection end; a micro-mixing channel, a cooling channel and a cooling cavity are arranged in the nozzle body, the micro-mixing channel is arranged to convey combustible gas, the outlet end of the micro-mixing channel is a fuel gas outlet, and the cooling channel, the cooling cavity and the cooling hole are sequentially communicated so that the cooling channel can provide cooling air for the cooling cavity. And cooling air in the cooling cavity is sprayed out from the cooling holes. According to the scheme, the air injection end of the micro-mixing nozzle can be effectively protected through cooling air, and the service life of the micro-mixing nozzle is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and in particular to a cooling micro-mixing nozzle, a burner and a gas turbine. Background Art

[0002] Gas turbines are one of the important equipment for clean utilization of fossil energy and are widely used in power generation, aviation, industrial power and other fields.

[0003] After the combustion gas ejected from the micro-mixing nozzle used in the gas turbine is burned, the flame will reflux in the recirculation zone at the jet end to form a cycle, thereby producing a continuous ignition effect. However, while this recirculation phenomenon improves the combustion efficiency, it may also cause thermal damage to the nozzle material. Especially when using hydrogen fuel, the combustion characteristics of hydrogen fuel will cause the flame temperature to increase significantly, the flame speed to increase, and the high-temperature gas will cause serious damage to the nozzle, resulting in a shorter service life of the nozzle.

[0004] Therefore, how to design an effective cooling air structure to prevent the high-temperature combustion gas from damaging the nozzle is a technical problem that needs to be solved at present. Summary of the invention

[0005] The embodiments of the present application provide a cooling micro-mixing nozzle, a burner and a gas turbine to solve the problem that the micro-mixing nozzle currently used in the gas turbine is damaged by heat and has a short service life.

[0006] The embodiment of the present application provides a cooling micro-mixing nozzle for a gas turbine, the cooling micro-mixing nozzle comprising a nozzle body, the jet end of the nozzle body being provided with a gas outlet and a plurality of cooling holes, the gas outlet being provided to jet combustible gas, the cooling holes being provided to jet cooling air to cool the jet end; A micro-mixing channel, a cooling channel and a cooling cavity are arranged in the nozzle body. The micro-mixing channel is arranged to convey combustible gas and an outlet end of the micro-mixing channel is the gas outlet. The cooling channel, the cooling cavity and the cooling hole are connected in sequence so that the cooling channel provides cooling air to the cooling cavity, and the cooling air in the cooling cavity is ejected from the cooling hole.

[0007] In one embodiment, the gas outlet is provided in plurality, and the plurality of cooling holes include a plurality of first cooling holes and a plurality of second cooling holes, the plurality of first cooling holes are arranged at the periphery of the plurality of gas outlets, and the plurality of second cooling holes are arranged at the center of the plurality of gas outlets.

[0008] In one embodiment, the nozzle body is further provided with a fuel cavity and a fuel channel for inputting fuel into the fuel cavity, a micro-mixing tube section having the micro-mixing channel passes through the fuel cavity, a connecting hole for connecting the micro-mixing channel with the fuel cavity is provided on the tube wall of the micro-mixing tube section, and the inlet end of the micro-mixing channel is provided as an air inlet, so that the fuel entering from the connecting hole and the air entering from the air inlet are mixed in the micro-mixing channel and then ejected from the gas outlet.

[0009] In one embodiment, the fuel cavity and the cooling cavity are separated by a partition, the cooling cavity is closer to the injection end than the fuel cavity, and the micro-mixing tube section passes through the fuel cavity, the partition and the cooling cavity in sequence.

[0010] In one embodiment, each of the micro-mixing tube segments is provided with at least one group of communicating holes, and each group of communicating holes includes a plurality of communicating holes at the same height position of the micro-mixing tube segment and arranged at intervals along the circumferential direction; The injection angle of at least one group of communicating holes is set so that a swirl is formed when the fuel is injected from the group of communicating holes into the micro-mixing channel.

[0011] In one embodiment, a plurality of cooling channels are provided, and the cooling micro-mixing nozzle further includes at least one baffle, each of which is configured to open and close a cooling air inlet of the cooling channel, and the flow rate of the cooling air is adjusted by adjusting the number of cooling air inlets opened by the baffle.

[0012] In one embodiment, a plurality of cooling air inlets are arranged at intervals on the periphery of the mild mixing channel; The cooling micro-mixing nozzle also includes a fixing ring detachably mounted on the nozzle body, a plurality of receiving grooves corresponding to the cooling air inlets are formed between the fixing ring and the nozzle body, and the baffle is fixed to the receiving groove when the fixing ring is mounted on the nozzle body, and the number of cooling air inlets opened is changed by installing different numbers of baffles.

[0013] In one embodiment, a fuel pipe having the fuel channel is provided on the nozzle body, and the fuel pipe includes an extended pipe section extending into the fuel cavity, so that the gas transported to the fuel cavity by the fuel channel flows back from bottom to top and enters the connecting hole.

[0014] An embodiment of the present application also provides a combustor, comprising at least one cooling micro-mixing nozzle as described above.

[0015] An embodiment of the present application also provides a gas turbine, comprising the combustor as described above.

[0016] The technical solution provided by the embodiment of the present application is that the cooling air ejected from the cooling hole can protect the jet end of the nozzle body from being eroded by high-temperature combustion gas, and by setting a cooling channel, the cooling air is first provided to the cooling cavity, and then the cooling air in the cooling cavity is redistributed to each cooling hole, which not only makes the cooling air evenly distributed to each cooling hole, but also makes the setting of the cooling holes more flexible, and the cooling holes can be arbitrarily arranged on the end face of the jet end corresponding to the cooling cavity as needed. Therefore, the solution provided by the present application can effectively protect the jet end of the micro-mixing nozzle by cooling air and extend the service life of the micro-mixing nozzle.

[0017] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0019] Figure 1 A schematic diagram of the structure of a cooling micro-mixing nozzle according to an embodiment of the present application; Figure 2 for Figure 1 The schematic diagram of the structure of the cooling micro-mixing nozzle viewed from the jet end; Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the cooling micro-mixing nozzle; Figure 4 is a schematic structural diagram of a micro-mixing pipe section cut at a connecting hole according to an embodiment of the present application; Figure 5 is a schematic structural diagram of a nozzle body according to an embodiment of the present application; Figure 6 Schematic diagram of the structure of a fixing ring according to an embodiment of the present application.

[0020] Description of reference numerals: 1-nozzle body; 11-cooling channel; 111-cooling air inlet; 12-cooling cavity; 13-cooling hole; 13a-first cooling hole; 13b-second cooling hole; 14-micro-mixing channel; 141-air inlet; 142-gas outlet; 15-micro-mixing pipe section; 151-connecting hole; 16-fuel channel; 161-extension pipe section; 162-connecting pipe section; 17-fuel cavity; 18-partition; 19-limiting recess; 2-fixing ring; 21-groove; 3-baffle. DETAILED DESCRIPTION

[0021] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0022] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique invention scheme. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0023] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0024] The embodiment of the present application provides a cooling micro-mixing nozzle for a gas turbine, such as Figure 1-Figure 3 As shown, the nozzle body 1 includes a nozzle body, and the nozzle body 1 is provided with a gas outlet 142 and a plurality of cooling holes 13 ( Figure 2 The nozzle body 1 shows the jet end thereof), the gas outlet 142 is configured to jet combustible gas, and the cooling hole 13 is configured to jet cooling air to cool the jet end.

[0025] The nozzle body 1 is provided with a micro-mixing channel 14, a cooling channel 11 and a cooling cavity 12. The micro-mixing channel 14 is configured to convey combustible gas and the outlet end of the micro-mixing channel 14 is the gas outlet 142. The cooling channel 11, the cooling cavity 12 and the cooling hole 13 are connected in sequence, so that the cooling channel 11 provides cooling air to the cooling cavity 12, and the cooling air in the cooling cavity 12 is ejected from the cooling hole 13.

[0026] According to the technical solution provided by the embodiment of the present application, the cooling air ejected from the cooling hole 13 can protect the jet end of the nozzle body 1 from being eroded by high-temperature combustion gas, and the cooling air is first provided to the cooling cavity 12 by setting the cooling channel 11, and then the cooling air in the cooling cavity 12 is redistributed to each cooling hole 13, which not only makes the cooling air evenly distributed to each cooling hole 13, but also makes the setting of the cooling holes 13 more flexible, and the cooling holes 13 can be arbitrarily arranged on the end face of the jet end corresponding to the cooling cavity 12 as needed.

[0027] Therefore, the solution provided in the present application can effectively protect the jet end of the micro-mixing nozzle by cooling air, thereby extending the service life of the micro-mixing nozzle.

[0028] In one embodiment, the gas outlet 142 is provided with a plurality of cooling holes 13, the plurality of cooling holes 13 include a plurality of first cooling holes 13a and a plurality of second cooling holes 13b, the plurality of first cooling holes 13a are arranged at the periphery of the plurality of gas outlets 142, and the plurality of second cooling holes 13b are arranged at the center of the plurality of gas outlets 142, Figure 2 As shown, a plurality of first cooling holes 13a are arranged at intervals on a circumference located at the outer periphery, and a plurality of second cooling holes 13b are arranged at intervals on a circumference located at the center.

[0029] In this embodiment, a plurality of first cooling holes 13a located at the periphery and a plurality of second cooling holes 13b located at the center are provided, and cooling air can be sprayed out from the periphery and the center of the plurality of gas outlets 142, respectively, thereby facilitating the formation of a cooling air protective film on the entire jet end, thereby more effectively protecting the jet end.

[0030] It is understandable that the arrangement of the cooling holes 13 is not limited to the above, and may be other arrangements. For example, more cooling holes 13 may be arranged in the high-temperature area of ​​the jet end.

[0031] In one embodiment, Figure 3As shown, the nozzle body 1 is further provided with a fuel cavity 17 and a fuel channel 16 for inputting fuel into the fuel cavity 17. A micro-mixing tube section 15 having a micro-mixing channel 14 passes through the fuel cavity 17. A connecting hole 151 for connecting the micro-mixing channel 14 with the fuel cavity 17 is provided on the tube wall of the micro-mixing tube section 15. The inlet end of the micro-mixing channel 14 is provided as an air inlet 141. The fuel entering from the connecting hole 151 and the air entering from the air inlet 141 are mixed in the micro-mixing channel 14 and then ejected from the gas outlet 142.

[0032] This embodiment provides a fuel cavity 17 so that the fuel in the fuel cavity 17 enters the micro-mixing channel 14 through the connecting hole 151 provided on the micro-mixing pipe section 15, thereby achieving mixing of fuel and air. This mixing method can enhance the mixing effect of fuel and air, and can achieve rapid and uniform mixing of fuel and air under high flow rate conditions, significantly improve the stability and efficiency of combustion, and reduce the spontaneous combustion and flashback caused by uneven fuel concentration. In addition, under the high temperature and high pressure environment of the gas turbine, the uniform fuel-air mixture can achieve more efficient combustion and reduce the emission of harmful NOx.

[0033] exist Figure 3 In the example, the fuel cavity 17 is separated from the cooling cavity 12 by a partition 18, the cooling cavity 12 is closer to the jet end of the nozzle body 1 than the fuel cavity 17, and the micro-mixing tube section 15 sequentially passes through the fuel cavity 17, the partition 18 and the cooling cavity 12. Since the cooling cavity 12 is closer to the jet end than the fuel cavity 17, the cooling cavity 12 separates the fuel from the high temperature area of ​​the jet end, which can further improve the protection performance of the nozzle.

[0034] In one embodiment, at least one group of connecting holes 151 is provided on each micro-mixing tube segment 15, and each group of connecting holes 151 includes a plurality of connecting holes 151 arranged at the same height position of the micro-mixing tube segment 15 and spaced apart along the circumferential direction. Since the fuel at different positions in the fuel cavity 17 may have different pressures, a plurality of connecting holes 151 are spaced apart along the circumferential direction on each micro-mixing tube segment 15, so that the fuel in the fuel cavity 17 can enter the micro-mixing tube segment 15 from different directions, which is conducive to improving the uniformity of the fuel entering the plurality of micro-mixing channels 14.

[0035] In one example, the injection angle of at least one group of communication holes 151 is set so that a swirl is formed when the fuel is injected into the micro-mixing channel 14 from the group of communication holes 151. The swirl formed by injecting the fuel into the micro-mixing channel 14 can enhance the mixing effect with the air flowing in the micro-mixing channel 14, so that the fuel and the air in the micro-mixing channel 14 are fully mixed.

[0036] like Figure 3-Figure 4In the example, each micro-mixing tube segment 15 is provided with a group of communicating holes 151, each group of communicating holes 151 is provided with four communicating holes 151, and the hole depth direction of each communicating hole 151 (the hole depth direction determines the injection direction of the hole) deviates from the radial direction of the micro-mixing tube segment 15, that is, the multiple communicating holes 151 in each group form a roughly spiral arrangement, so that the fluid injected into the micro-mixing channel 14 by the multiple communicating holes 151 can form a swirl.

[0037] It is understandable that each micro-mixing tube segment 15 may be provided with multiple groups of communication holes 151, not limited to one group, and each group may be provided with three or five or other numbers of communication holes 151. In addition, the communication holes 151 may also be arranged in other ways, not limited to the arrangement described in the above embodiment.

[0038] In one embodiment, a fuel pipe having the fuel channel 16 is provided on the nozzle body 1, and the fuel pipe includes an extended pipe section 161 extending into the fuel cavity 17, so that the gas transported to the fuel cavity 17 by the fuel channel 16 flows back from bottom to top and enters the connecting hole 151. Here, up and down are defined according to the upstream and downstream of the gas transport direction of the fuel channel 16, and the position located relatively upstream is defined as "up".

[0039] By setting the extension pipe section 161, the fuel can be directed to a certain position in the fuel chamber 17, and then the fuel flows back from the bottom to the top at the position in the fuel chamber 17 and then enters the connecting hole 151. Because the refluxed fuel can be more evenly distributed at various positions in the fuel chamber 17, the pressure in the fuel chamber 17 is uniform, so that the fuel can be evenly distributed to multiple micro-mixing channels 14 to prevent local rich or lean combustion. The length of the extension pipe section 161 can be set so that the extension pipe section 161 extends to a certain distance from the bottom of the fuel chamber 17, or the outlet of the extension pipe section 161 exceeds a certain distance from the connecting hole 151 in the gas delivery direction of the fuel channel 16.

[0040] The fuel pipe may further include a connecting pipe section 162 connected to the extending pipe section 161 , and the connecting pipe section 162 may be conveniently connected to a fuel supply device.

[0041] In one embodiment, the cooling channel 11 is provided with a plurality of cooling channels, and the cooling micro-mixing nozzle further includes at least one baffle 3, each baffle 3 being configured to open and close a cooling air inlet 111 of a cooling channel 11. The number of cooling air inlets 111 opened is adjusted by the baffle 3, so that the flow rate of cooling air can be adjusted. For different combustion conditions, for example, when using different fuels, the flow rate of cooling air can be adjusted to ensure that the cooling effect and the combustion effect of the nozzle are optimally balanced.

[0042] exist Figure 1In the example, the multiple air inlets 141 of the multiple micro-mixing channels 14 and the cooling air inlets 111 of the multiple cooling channels 11 are located at the same end, and an air supply cavity can be set at the end. The air in the air supply cavity is simultaneously provided to the micro-mixing channels 14 and the cooling channels 11. By changing the flow rate of the cooling air entering the cooling channels 11, the flow rate of the air entering the micro-mixing channels 14 can be changed. Therefore, by accurately controlling the flow rate of the cooling air entering the cooling channels, the best combustion effect can be ensured.

[0043] exist Figure 1-Figure 3 In the example, a plurality of cooling air inlets 111 are arranged at intervals on the periphery of the micro-mixing channel 14. To facilitate the installation of the baffle 3, the cooling micro-mixing nozzle further includes a fixing ring 2 detachably mounted on the nozzle body 1, and a plurality of receiving grooves corresponding to the cooling air inlets 111 are formed between the fixing ring 2 and the nozzle body 1. When the fixing ring 2 is fixed to the nozzle body 1, the baffle 3 is fixed to the receiving groove, and the number of cooling air inlets 111 opened can be changed by installing different numbers of baffles 3. When adjusting the number of cooling air inlets 111 opened, the fixing ring 2 can be removed and the number of baffles 3 installed can be adjusted.

[0044] Figure 6 The fixing ring 2 in one embodiment is shown. A groove 21 is provided on one side of the fixing ring 2 facing the nozzle body 1 and at a position corresponding to each cooling air inlet 111. When the fixing ring 2 is installed on the nozzle body 1, the groove 21 and the nozzle body 1 together form a receiving groove for receiving the baffle 3. In addition, in order to facilitate the positioning of the fixing ring 2 on the nozzle body 1, as shown in FIG. Figure 5 As shown, the nozzle body 1 is provided with an annular limiting recess 19, which is substantially consistent in shape with the fixing ring 2, so that the fixing ring 2 can be installed in cooperation with the limiting recess 19. When each baffle 3 is placed between the fixing ring 2 and the nozzle body 1, and the fixing ring 2 is fixed to the nozzle body 1, the baffle 3 can be fixed in the receiving groove between the two. The fixing ring 2 can be fixed to the nozzle body 1 by bolts.

[0045] It is understandable that the baffle 3 may also be installed in other ways, for example, the baffle 3 may be rotatably installed, the cooling air inlet 111 is opened when the baffle 3 is rotated to the first position, and the cooling air inlet 111 is closed when the baffle 3 is rotated to the second position.

[0046] An embodiment of the present application also provides a combustor, comprising at least one cooling micro-mixing nozzle as described above.

[0047] An embodiment of the present application also provides a gas turbine, comprising the combustor as described above.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include at least one of the features.

[0050] In the description of the present application, “plurality” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0054] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A cooling micro-mixing nozzle for a gas turbine, characterized in that: The cooling micro-mixing nozzle comprises a nozzle body, the jet end of the nozzle body is provided with a gas outlet and a plurality of cooling holes, the gas outlet is configured to jet combustible gas, and the cooling holes are configured to jet cooling air to cool the jet end; A micro-mixing channel, a cooling channel and a cooling cavity are arranged in the nozzle body. The micro-mixing channel is arranged to convey combustible gas and an outlet end of the micro-mixing channel is the gas outlet. The cooling channel, the cooling cavity and the cooling hole are connected in sequence so that the cooling channel provides cooling air to the cooling cavity, and the cooling air in the cooling cavity is ejected from the cooling hole.

2. The cooling micro-mixing nozzle according to claim 1, characterized in that: The gas outlet is provided with a plurality of cooling holes, the plurality of cooling holes include a plurality of first cooling holes and a plurality of second cooling holes, the plurality of first cooling holes are arranged at the periphery of the plurality of gas outlets, and the plurality of second cooling holes are arranged at the center of the plurality of gas outlets.

3. The cooling micro-mixing nozzle according to claim 1, characterized in that: The nozzle body is further provided with a fuel cavity and a fuel channel for inputting fuel into the fuel cavity, a micro-mixing tube section having the micro-mixing channel passes through the fuel cavity, a connecting hole for connecting the micro-mixing channel with the fuel cavity is provided on a tube wall of the micro-mixing tube section, and an inlet end of the micro-mixing channel is provided as an air inlet, so that the fuel entering from the connecting hole and the air entering from the air inlet are mixed in the micro-mixing channel and then ejected from the gas outlet.

4. The cooling micro-mixing nozzle according to claim 3, characterized in that: The fuel cavity is separated from the cooling cavity by a partition, the cooling cavity is closer to the injection end than the fuel cavity, and the micro-mixing tube section passes through the fuel cavity, the partition and the cooling cavity in sequence.

5. The cooling micro-mixing nozzle according to claim 3, characterized in that: Each of the micro-mixing tube sections is provided with at least one group of communication holes, and each group of communication holes includes a plurality of communication holes which are arranged at the same height position of the micro-mixing tube section and are spaced apart along the circumferential direction; The injection angle of at least one group of communicating holes is set so that a swirl is formed when the fuel is injected from the group of communicating holes into the micro-mixing channel.

6. The cooling micro-mixing nozzle according to any one of claims 3 to 5, characterized in that: There are multiple cooling channels, and the cooling micro-mixing nozzle also includes at least one baffle, each of which is configured to open and close a cooling air inlet of the cooling channel, and the flow rate of the cooling air is adjusted by adjusting the number of cooling air inlets opened by the baffle.

7. The cooling micro-mixing nozzle according to claim 6, characterized in that: A plurality of cooling air inlets are arranged at intervals on the periphery of the mild mixing channel; The cooling micro-mixing nozzle also includes a fixing ring detachably mounted on the nozzle body, a plurality of receiving grooves corresponding to the cooling air inlets are formed between the fixing ring and the nozzle body, and the baffle is fixed to the receiving groove when the fixing ring is mounted on the nozzle body, and the number of cooling air inlets opened is changed by installing different numbers of baffles.

8. The cooling micro-mixing nozzle according to any one of claims 3 to 5, characterized in that: The nozzle body is provided with a fuel pipe having the fuel channel, and the fuel pipe includes an extended pipe section extending into the fuel cavity, so that the gas transported to the fuel cavity by the fuel channel flows back from bottom to top and enters the connecting hole.

9. A burner, characterized in that: The method comprises at least one cooling micro-mixing nozzle according to any one of claims 1 to 8.

10. A gas turbine, characterized in that: Comprising a burner according to claim 9.

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