Micro-mix service nozzle, combustion nozzle and gas turbine

Abstract

The application discloses a kind of micro-mixing watch nozzle, combustion nozzle and gas turbine, the micro-mixing watch nozzle includes first shell, second shell and cover plate, first shell is sleeved on second shell, and watch air passage is defined between first shell and second shell, second shell defines watch fuel passage, cover plate is located at the same end of first shell and second shell, cover plate is equipped with multiple micro-mixing orifices, which are spaced along the circumference of the cover plate, the micro-mixing orifices extend in the direction from the inner end of the cover plate to the outer end of the cover plate and are inclined along the circumference of the cover plate, the inlet ends of the multiple micro-mixing orifices are in communication with the watch air passage, the cover plate is also provided with multiple feed branches extending along the radial direction of the cover plate, the multiple feed branches are spaced along the circumference of the second shell, the inlet ends of the multiple feed branches are in communication with the watch fuel passage, and the outlet ends of the multiple feed branches are in corresponding communication with the multiple micro-mixing orifices. The micro-mixing watch nozzle of the application has high adaptability and strong environmental protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbine technology, in particular, to a micro-mixing pilot nozzle, a combustion nozzle and a gas turbine. BACKGROUND

[0002] The gas turbine is a kind of rotary heat engine that converts heat energy into mechanical work by burning continuous flowing gas as working medium to drive the impeller to rotate at high speed, and its main components include compressor, combustion chamber and gas turbine.

[0003] To meet the requirements of relevant environmental regulations, the mainstream gas turbine currently adopts lean premixed combustion technology, that is, air and fuel are premixed in a proportion less than the theoretical stoichiometric ratio, and then the mixed gas is input into the combustion chamber through the combustion nozzle for combustion, thereby improving the combustion efficiency of the gas turbine and reducing the nitrogen oxide emission of the gas turbine, however, under partial load conditions, for example, when the air flow velocity in the premixing channel is too high and the equivalent ratio is low, the flame stability formed by the combustion nozzle is poor, which will cause the combustion temperature to decrease and trigger thermal acoustic oscillation, seriously damaging the service life of the combustion chamber related components.

[0004] In the related art, to solve the above problems, a pilot nozzle is usually arranged downstream of the combustion nozzle, and the gas ejected from the pilot nozzle will form a diffusion flame during combustion, thereby improving the stability of combustion of the combustion nozzle, however, the diffusion flame generated by the pilot nozzle in the related art has a relatively high combustion temperature and a relatively concentrated heat release, when the gas turbine is in a low load condition, the emission of carbon monoxide and unburned hydrocarbons is high, and when the gas turbine is in a basic load or high load condition, the emission of nitrogen oxides is high. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a micro-mixing pilot nozzle, which has strong stability of diffusion flame and can adapt to various operating conditions of the gas turbine, thereby reducing the emission of nitrogen oxides, carbon monoxide and unburned hydrocarbons.

[0006] The embodiment of the present application also provides a combustion nozzle.

[0007] The embodiment of the present application also provides a gas turbine.

[0008] The micro-mixing duty nozzle comprises a first shell and a second shell, the first shell and the second shell extend along a first direction, the first shell is sleeved on the second shell, a duty air passage is defined between the inner circumferential surface of the first shell and the outer circumferential surface of the second shell, and the inner circumferential surface of the second shell defines a duty fuel passage; a cover plate is arranged at one end of the first shell and one end of the second shell in the first direction to cover the duty air passage and the duty fuel passage, the cover plate is provided with a plurality of micro-mixing injection holes arranged along the circumferential direction of the cover plate, the micro-mixing injection holes extend along the direction from the inner end of the cover plate to the outer end of the cover plate and are arranged obliquely along the circumferential direction of the cover plate, the inlet ends of the plurality of micro-mixing injection holes are communicated with the duty air passage, and the cover plate is further provided with a plurality of fuel supply branches extending along the radial direction of the cover plate, the plurality of fuel supply branches are arranged along the circumferential direction of the second shell, the inlet ends of the plurality of fuel supply branches are communicated with the duty fuel passage, and the outlet ends of the plurality of fuel supply branches are communicated with the plurality of micro-mixing injection holes.

[0009] According to the micro-mixing duty nozzle, the duty air passage between the first shell and the second shell is used for flowing of duty air, after the duty air flows to the front end of the duty air passage, the duty air continues to flow out of the outer end of the cover plate through the plurality of micro-mixing injection holes arranged along the circumferential direction of the cover plate, the duty fuel passage in the second shell is used for flowing of duty fuel, after the duty fuel flows to the front end of the duty fuel passage, the duty fuel continues to flow into the micro-mixing injection holes through the plurality of fuel supply branches arranged along the circumferential direction of the second shell, thereby in the micro-mixing injection holes, the duty air and the duty fuel are mixed in the micro-pipeline to form the premixed gas, so that the combustion efficiency of the duty nozzle is improved, the stability of the diffusion flame formed by the duty nozzle is improved, various operating conditions of the gas turbine are adapted, and the emission amounts of nitrogen oxides, carbon monoxide and unburned hydrocarbons are reduced.

[0010] In addition, in the micro-mixing duty nozzle, each fuel supply branch communicates the duty fuel passage and the micro-mixing injection hole along the radial direction of the cover plate, thereby the fuel originally flowing along the axial direction of the second shell in the duty fuel passage changes to flow along the radial direction of the second shell after being transferred to the fuel supply branch, so that in the micro-mixing injection hole, the fuel flowing along the radial direction of the second shell is mixed with the air flowing along the axial direction of the second shell, the mixing effect of the premixed gas is improved, and the applicability of the nozzle is improved.

[0011] In some embodiments, in a projection plane perpendicular to the first direction, the center of the projection of the inlet end of the micro-mixing injection hole and the center of the projection of the outlet end of the micro-mixing injection hole are located on the same circumference with the center of the projection of the cover plate as the center, and the projection of the inlet end of the micro-mixing injection hole and the projection of the outlet end of the micro-mixing injection hole do not overlap.

[0012] In some embodiments, the center axis of the micro-mixing injection hole has an inclination angle of a with respect to the first direction, and 0 < a ≤ 80°.

[0013] In some embodiments, the center axis of the supply branch intersects with the center axis of the micro-mixing injection hole.

[0014] In some embodiments, the cover plate has a cooling cavity, a plurality of the micro-mixing injection holes are arranged around the cooling cavity at intervals, an inner end surface of the cover plate is provided with a gas supply branch extending along the first direction, the gas supply branch communicates the cooling cavity with the on-duty air passage, and an outer end surface of the cover plate is provided with a plurality of first cooling injection holes extending along the first direction and communicating with the cooling cavity.

[0015] In some embodiments, the gas supply branch has a plurality of gas supply branches arranged at intervals along the circumference of the cover plate, and in a cross section of the cover plate, the gas supply branches and the supply branches are arranged alternately along the circumference of the cover plate.

[0016] In some embodiments, the flow area of the micro-mixing injection hole is S1, the flow area of the gas supply branch is S2, and the flow area of the supply branch is S3, and S1 > S2 > S3.

[0017] In some embodiments, at least part of the first cooling injection holes are distributed in rotational symmetry around the center of the cover plate, the flow area of the first cooling injection hole is S4, and S4 < S3.

[0018] In some embodiments, the cover plate is provided with a plurality of second cooling injection holes penetrating through the cover plate along the first direction, a plurality of the second cooling injection holes are arranged at intervals around a plurality of the micro-mixing injection holes, and the inlet end of the second cooling injection hole communicates with the on-duty air passage.

[0019] The fuel nozzle of the embodiment of the present application comprises: a micro-mix duty nozzle, which is the micro-mix duty nozzle according to the above embodiment; a fuel input pipe, which defines a fuel input channel, the fuel input channel being communicated with the duty fuel channel of the micro-mix duty nozzle; an air input pipe, which is sleeved on the fuel input pipe, and an air input channel is defined between the inner circumferential surface of the air input pipe and the outer circumferential surface of the fuel input pipe, the air input channel being communicated with the duty air channel of the micro-mix duty nozzle; and a premix fuel input pipe, which is sleeved on the air input pipe, and a premix fuel channel is defined between the inner circumferential surface of the premix fuel input pipe and the outer circumferential surface of the air input pipe, the premix fuel input pipe being provided with a plurality of premix fuel injection holes at one end thereof towards the micro-mix duty nozzle, the plurality of premix fuel injection holes being arranged at intervals along the circumference of the premix fuel input pipe.

[0020] The fuel nozzle according to the embodiment of the present application can provide the duty fuel to the micro-mix duty nozzle of the above embodiment through the fuel input channel, provide the duty air to the micro-mix duty nozzle of the above embodiment through the air input channel, to ensure the normal operation of the micro-mix duty nozzle, and the premix fuel in the premix fuel channel is ejected from the premix fuel injection holes to contact the diffusion flame formed by the duty nozzle to burn, to ensure the stable combustion of the combustion nozzle and reduce the emission of pollution gas by the combustion nozzle.

[0021] The gas turbine according to the embodiment of the present application comprises the fuel nozzle according to the above embodiment.

[0022] The gas turbine according to the embodiment of the present application has strong operation stability and good environmental protection by adopting the combustion nozzle according to the above embodiment. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of the micro-mix duty nozzle according to the embodiment of the present application.

[0024] Figure 2 is an axial side view of the micro-mix duty nozzle according to the embodiment of the present application.

[0025] Figure 3 is an axial side view of the micro-mix duty nozzle according to the embodiment of the present application from another perspective.

[0026] Figure 4 is Figure 2 an A-A sectional view of

[0027] Figure 5 is Figure 2 a B-B sectional view of

[0028] Figure 6 is Figure 2CC cross-section view.

[0029] Figure 7 This is a schematic diagram of the structure of a combustion nozzle according to an embodiment of the present invention.

[0030] Figure label:

[0031] 1. First housing; 2. Second housing; 3. Cover plate; 31. Micro-mixing nozzle; 32. Feeding branch; 33. Cooling chamber; 34. Air supply branch; 35. First cooling nozzle; 36. Second cooling nozzle; 4. Shift air passage; 5. Shift fuel passage; 6. Fuel input pipe; 7. Air input pipe; 8. Premixed fuel input pipe; 81. Premixed fuel nozzle; Detailed Implementation

[0032] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] like Figures 1-6 As shown, the micro-mixing duty nozzle of this embodiment of the invention includes a first housing 1, a second housing 2, and a cover plate 3.

[0034] Specifically, the first housing 1 and the second housing 2 are along a first direction (e.g., Figure 2 Extending in the front-back direction (as shown), the first housing 1 is fitted onto the second housing 2. The inner circumferential surface of the first housing 1 and the outer circumferential surface of the second housing 2 define a duty air passage 4. The inner circumferential surface of the second housing 2 defines a duty fuel passage 5. A cover plate 3 is provided at one end of the first housing 1 in the first direction and at one end of the second housing 2 in the first direction to cover the duty air passage 4 and the duty fuel passage 5. The cover plate 3 is provided with a plurality of micro-mixing spray holes 31 spaced apart along the circumference of the cover plate 3. The micro-mixing spray holes 31 extend from the inner end of the cover plate 3 to the outer end of the cover plate 3 and are inclined along the circumference of the cover plate 3. The inlet end of the plurality of micro-mixing spray holes 31 is connected to the duty air passage 4. The cover plate 3 is also provided with a plurality of feeding branches 32 extending radially along the cover plate 3. The plurality of feeding branches 32 are arranged spaced apart along the circumference of the second housing 2. The inlet end of the plurality of feeding branches 32 is connected to the duty fuel passage 5. The outlet end of the plurality of feeding branches 32 is connected to the plurality of micro-mixing spray holes 31 respectively.

[0035] It can be understood that the first shell 1 and the second shell 2 form a double-channel sleeve structure, and a spacing space between the first shell 1 and the second shell 2 is used for circulating the duty air, after the duty air flows to the front end of the first shell 1, the duty air continues to flow out to the outer end surface of the cover plate 3 through the plurality of micro-mixing injection holes 31 arranged at intervals along the circumference of the cover plate 3, and the space in the second shell 2 is used for circulating the duty fuel, after the duty fuel flows to the front end of the second shell 2, the duty fuel continues to flow into the micro-mixing injection hole 31 through the plurality of fuel supply branches 32 arranged at intervals along the circumference of the second shell 2, so that in the micro-mixing injection hole 31, the duty air and the duty fuel are mixed in the micro-pipeline to form a premixed gas, thereby improving the combustion efficiency of the micro-mixing duty nozzle, and further improving the stability of the diffusion flame formed by the micro-mixing duty nozzle, so as to adapt to various operating conditions of the gas turbine, reduce the emission of nitrogen oxides, carbon monoxide and unburned hydrocarbons, and at the same time, the caliber of the micro-mixing injection hole 31 is small, and the self-quenching effect can improve the anti-backfire capability of the micro-mixing duty nozzle and improve the safety of the diffusion flame formed by the micro-mixing duty nozzle.

[0036] It can be understood that under different operating conditions of the gas turbine, the mixing ratio of the duty air and the duty fuel can be changed by adjusting the supply amount of the air in the micro-mixing injection hole 31 or the supply amount of the fuel in the fuel supply branch 32, so as to obtain better diffusion flame stability and less pollution gas emission.

[0037] It should be noted that the inventor has found through research that in the related art, in order to prevent backfire, the premixed air injection holes of the duty nozzle are usually arranged radially along the circumference of the duty nozzle, however, the premixed gas sprayed by this injection hole arrangement will form a horn-shaped airflow downstream of the duty nozzle, and the flame stabilizing effect is poor, while in the micro-mixing duty nozzle of the present application, the micro-mixing injection hole 31 extends along the direction from the inner end of the cover plate 3 to the outer end of the cover plate 3 and is arranged obliquely along the circumference of the cover plate 3, that is, in the projection plane perpendicular to the first direction, the center of the projection of the inlet end of the micro-mixing injection hole 31 and the center of the projection of the outlet end of the micro-mixing injection hole 31 are located on the same circumference with the center of the projection of the cover plate 3 as the center, and the projection of the inlet end of the micro-mixing injection hole 31 and the projection of the outlet end of the micro-mixing injection hole 31 do not coincide, so that under the restriction of the extension direction of the micro-mixing injection hole 31, the sprayed premixed gas will form a rotating airflow on the outer end surface of the cover plate 3, and the rotating airflow can produce a better flame stabilizing effect to protect the diffusion flame formed by the micro-mixing duty nozzle, thereby improving the applicability of the nozzle.

[0038] Preferably, as Figures 1-6As shown, the plurality of micro-mixing injection holes 31 are distributed at equal intervals around the central axis of the cover plate 3, at this time, the inlet ends of the plurality of micro-mixing injection holes 31 are located on the same circumference with the center of the cover plate 3 as the center, the outlet ends of the plurality of micro-mixing injection holes 31 are also located on the same circumference with the center of the cover plate 3 as the center, and the radii of the two circumferences are consistent, thereby improving the rationality of the nozzle structure while ensuring that the amount of premixed gas sprayed in each direction remains uniform.

[0039] It can be understood that the central axis of the micro-mixing injection hole 31 has an inclination angle relative to the first direction, the inclination angle is α, and 0 < α ≤ 80°, that is, the central axis of the micro-mixing injection hole 31 has an included angle with the first direction, and the range of the included angle is between 0-80°, which avoids affecting the normal flow of the premixed gas due to the excessive inclination angle of the micro-mixing injection hole 31, and preferably, the inclination angle α is 60°. In some embodiments, the central axis of the micro-mixing injection hole 31 is inclined in the clockwise direction of the cover plate 3, and in other embodiments, the central axis of the micro-mixing injection hole 31 is inclined in the counterclockwise direction of the cover plate 3.

[0040] The inventor found through in-depth research that in the related art, in order to ensure the uniformity of the mixing of the standby air and the standby fuel, the front end of the standby nozzle is usually provided with a special premixing cavity, the standby air and the standby fuel are mixed in the premixing cavity and then discharged outward through the injection hole communicating with the premixing cavity, which leads to an increase in the space occupation volume of the standby nozzle, and in the micro-mixing standby nozzle of the present application, the plurality of fuel supply branches 32 distribute the standby fuel into different micro-mixing injection holes 31 to directly mix with the standby air in the micro-mixing injection holes 31, in each micro-mixing injection hole 31, the standby air and the standby fuel are mixed in a small amount and then directly discharged outward, which improves the mixing uniformity of the premixed air while avoiding the increased space occupation of the standby nozzle due to the setting of the premixing cavity, and in the micro-mixing standby nozzle of the present application, each fuel supply branch 32 communicates the standby fuel channel 5 and the micro-mixing injection hole 31 in the radial direction of the cover plate 3, thereby the fuel originally flowing in the axial direction of the second shell 2 in the standby fuel channel 5 is changed to flow in the radial direction of the second shell 2 after being transferred to the fuel supply branch 32, so that in the micro-mixing injection hole 31, the fuel flowing in the radial direction of the second shell 2 is mixed with the air flowing in the axial direction of the second shell 2, which improves the uniformity of the premixed gas, and the uniformly mixed premixed gas can optimize the combustion effect of the micro-mixing standby nozzle and reduce the emission of pollutants from the gas turbine.

[0041] Optionally, the first shell 1, the second shell 2 and the cover plate 3 are integrally formed, or the first shell 1, the second shell 2 and the cover plate 3 are separately provided, which can be reasonably selected according to the process requirements of the gas turbine, and in some embodiments, the first shell 1 and the second shell 2 are circular pipes with different diameters, and the central axes of the two circular pipes are coaxial, which improves the uniformity of gas flow and simplifies the production process of the micro-mixing standby nozzle.

[0042] According to the micro-mixing duty nozzle of the embodiment of the present application, the duty air passage between the first shell and the second shell is used for the flow of duty air, after the flow of duty air flows to the front end of the duty air passage, the duty air continues to flow out of the outer end surface of the cover plate through the plurality of micro-mixing injection holes arranged along the circumference of the cover plate, and the duty fuel passage in the second shell is used for the flow of duty fuel, after the flow of duty fuel flows to the front end of the duty fuel passage, the duty fuel continues to flow into the micro-mixing injection hole through the plurality of fuel supply branches arranged along the circumference of the second shell, so that in the micro-mixing injection hole, the duty air and the duty fuel are mixed in the micro-passage to form the premixed gas, thereby improving the combustion efficiency of the duty nozzle, and further improving the stability of the diffusion flame formed by the micro-mixing duty nozzle to adapt to various operating conditions of the gas turbine, and reducing the emission of nitrogen oxides, carbon monoxide and unburned hydrocarbons.

[0043] In addition, in the micro-mixing duty nozzle of the present application, each fuel supply branch communicates the duty fuel passage and the micro-mixing injection hole along the radial direction of the cover plate, so that the fuel originally flowing in the duty fuel passage along the axial direction of the second shell changes to flow along the radial direction of the second shell after being transferred to the fuel supply branch, so that in the micro-mixing injection hole, the fuel flowing along the radial direction of the second shell is mixed with the air flowing along the axial direction of the second shell, thereby improving the uniformity of the mixing of the premixed gas, and the uniformly mixed premixed gas can optimize the combustion effect of the micro-mixing duty nozzle and reduce the emission of pollutants from the gas turbine.

[0044] Further, as shown in Figure 1 and Figure 6 , the central axis of the fuel supply branch 32 intersects the central axis of the micro-mixing injection hole 31, at this time, the flow of duty fuel in the fuel supply branch 32 is mixed orthogonally with the flow of duty air in the micro-mixing injection hole 31, thereby improving the uniformity of the mixing of the duty fuel and the duty air.

[0045] Further, as shown in Figures 1-3 , the cover plate 3 has a cooling cavity 33, a plurality of micro-mixing injection holes 31 are arranged along the circumference of the cooling cavity 33, the inner end surface of the cover plate 3 is provided with a gas supply branch 34 extending along the first direction, the gas supply branch 34 communicates the cooling cavity 33 and the duty air passage 4, and the outer end surface of the cover plate 3 is provided with a plurality of first cooling injection holes 35 extending along the first direction and communicating with the cooling cavity 33.

[0046] It should be noted that the standby air in the standby air passage 4 can be mixed with the standby fuel to form a premixed gas, and can also be used as a cooling gas for the micro-mixing standby nozzle. Specifically, in the micro-mixing standby nozzle of the present application, a plurality of micro-mixing injection holes 31 are arranged around the cooling cavity 33, so that after the standby air flows into the cooling cavity 33 from the gas supply branch 34 to form a low-temperature gas flow, the low-temperature gas flow can directly exchange heat with the high-temperature gas flow generated in the micro-mixing injection hole 31 due to combustion, thereby reducing the temperature of the cover plate 3 and improving the durability of the standby nozzle. The exchanged gas is then discharged outwardly through the plurality of first cooling holes.

[0047] Optionally, in the first direction, the thickness of the cooling cavity 33 is 30%-50% of the thickness of the cover plate 3, so as to avoid affecting the structural rigidity of the cover plate 3 due to the excessive size of the cooling cavity 33.

[0048] Further, as shown in Figure 1 , Figure 2 , Figure 5 and Figure 6 , the gas supply branch 34 has a plurality of gas supply branches 34 arranged along the circumference of the cover plate 3, and in the cross section of the cover plate 3, the gas supply branch 34 and the material supply branch 32 are arranged alternately along the circumference of the cover plate 3.

[0049] It can be understood that the standby air can be input into the cooling cavity 33 through the plurality of gas supply branches 34 arranged along the circumference of the cover plate 3, thereby improving the uniformity of the distribution of the standby air in the cooling cavity 33. In some embodiments, the number of gas supply branches 34 is 10-16, the center axes of the plurality of gas supply branches 34 are located on the same circle with the center of the cover plate 3 as the center, and the spacing distance between adjacent gas supply branches 34 is kept consistent, so as to improve the rationality of the structural design of the plurality of gas supply branches 34.

[0050] It can be understood that since the gas supply branch 34 extends along the radial direction of the cover plate 3, there is a spacing space between adjacent gas supply branches 34, and the material supply branch 32 is arranged in the spacing space along the axial direction of the cover plate 3 (i.e. the included angle between the extension directions of the gas supply branch 34 and the material supply branch 32 is 90°), thereby improving the compactness of the pipeline design of the cover plate 3. In some embodiments, one gas supply branch 34 is arranged between each pair of adjacent material supply branches 32, and in other embodiments, 2-3 gas supply branches 34 can be arranged between each pair of adjacent material supply branches 32, which can be reasonably designed according to the size of the spacing space.

[0051] Further, as shown in Figure 1 , Figure 2 , Figure 5 and Figure 6 , the flow area of the micro-mixing injection hole 31 is S1, the flow area of the gas supply branch 34 is S2, and the flow area of the material supply branch 32 is S3, and S1>S2>S3.

[0052] It can be understood that the flow rate of the duty air is the same in the duty air passage 4, and the flow rate of the duty air changes after the duty air is branched to the micro-mixing injection hole 31 and the air supply branch 34 due to the different flow areas of the micro-mixing injection hole 31 and the air supply branch 34. When S1>S2, the flow rate of the duty air in the air supply branch 34 is greater than that in the micro-mixing injection hole 31, so that fresh low-temperature gas in the cooling cavity 33 is always used to exchange heat with the high-temperature gas flow in the micro-mixing injection hole 31, and rapid cooling of the micro-mixing duty injection nozzle is realized.

[0053] It can be understood that the small flow area of the fuel supply branch 32 can ensure the jet rigidity of the duty fuel in the fuel supply branch 32, so that the duty fuel has a large enough momentum to mix with the duty air after entering the micro-mixing injection hole 31, and the mixing uniformity of the duty air and the duty fuel is improved.

[0054] Preferably, the micro-mixing injection hole 31, the air supply branch 34 and the fuel supply branch 32 are circular pipelines with diameters decreasing in sequence.

[0055] Further, as shown in Figure 4 At least part of the plurality of first cooling injection holes 35 is distributed in a rotational symmetry with the center of the cover plate 3, and the flow area of the first cooling injection hole 35 is S4, and S4<S3.

[0056] It can be understood that the first cooling injection hole 35 has multiple arrangements. The first cooling injection hole 35 can be densely arranged near the micro-mixing injection hole 31 on the outer end surface of the cover plate 3, and can be appropriately arranged away from the micro-mixing injection hole 31 on the outer end surface of the cover plate 3, so as to guide the cooling gas flow to the heat-concentrated part of the micro-mixing duty injection nozzle. In some embodiments, the first cooling injection hole 35 has multiple groups, and the multiple groups of first cooling injection holes 35 are located on different circumferences with the center of the cover plate 3 as the center.

[0057] Further, as shown in Figures 4-6 The cover plate 3 is provided with a plurality of second cooling injection holes 36 penetrating the cover plate 3 in the first direction, and the plurality of second cooling injection holes 36 are arranged at intervals around the plurality of micro-mixing injection holes 31. The inlet end of the second cooling injection hole 36 is in communication with the duty air passage 4.

[0058] Preferably, the plurality of second cooling orifices 36 are located on the same circle with the center of the cover plate 3 as the center, the outlet ends of the plurality of micro-mixing orifices 31 are also located on the same circle with the center of the cover plate 3 as the center, and the radius of the circle where the second cooling orifices 36 are located is greater than the radius of the circle where the micro-mixing orifices 31 are located. Thus, when the service air in the service air passage 4 is sprayed outwards by the second cooling orifices 36, the service air flow can cool the outer periphery of the micro-mixing service nozzle, avoiding damage to the micro-mixing service nozzle caused by high-temperature air flow. In some embodiments, the diameters of the first cooling orifices 35 and the second cooling orifices 36 are consistent.

[0059] As shown in Figure 7 the fuel nozzle of the embodiment of the present application includes a micro-mixing service nozzle, an air input pipe 7, a fuel input pipe 6, and a premixed fuel input pipe 8.

[0060] Specifically, the micro-mixing service nozzle is the micro-mixing service nozzle of the above-mentioned embodiment, the fuel input pipe 6 defines a fuel input passage that is in communication with the service fuel passage 5 of the micro-mixing service nozzle, the air input pipe 7 is sleeved on the fuel input pipe 6, and the inner periphery of the air input pipe 7 and the outer periphery of the fuel input pipe 6 define an air input passage that is in communication with the service air passage 4 of the micro-mixing service nozzle, and the premixed fuel input pipe 8 is sleeved on the air input pipe 7, and the inner periphery of the premixed fuel input pipe 8 and the outer periphery of the air input pipe 7 define a premixed fuel passage, and the end of the premixed fuel input pipe 8 towards the micro-mixing service nozzle is provided with a plurality of premixed fuel orifices 81, and the plurality of premixed fuel orifices 81 are arranged along the circumference of the premixed fuel input pipe 8.

[0061] It can be understood that the service fuel can flow into the service fuel passage 5 through the fuel input passage to supply the service fuel to the micro-mixing service nozzle, the service air can flow into the service air passage through the air input passage to supply the service air to the micro-mixing service nozzle, thereby ensuring the normal operation of the micro-mixing service nozzle, and the premixed fuel in the premixed fuel passage is sprayed out of the premixed fuel orifices 81 to contact the diffusion flame formed by the service nozzle to burn, thereby ensuring the normal operation of the gas turbine.

[0062] The fuel nozzle according to the embodiment of the present application can supply the service fuel to the micro-mixing service nozzle of the above-mentioned embodiment through the fuel input passage, supply the service air to the micro-mixing service nozzle of the above-mentioned embodiment through the air input passage, thereby ensuring the normal operation of the micro-mixing service nozzle, and the premixed fuel in the premixed fuel passage is sprayed out of the premixed fuel orifices to contact the diffusion flame formed by the micro-mixing service nozzle to burn, thereby ensuring the stable combustion of the combustion nozzle and reducing the emission of pollutants by the combustion nozzle.

[0063] The gas turbine of the embodiment of the present application includes the fuel nozzle according to the above-mentioned embodiment.

[0064] The gas turbine according to the embodiment of the application has stable operation and good environmental protection by using the combustion nozzle according to the above embodiment.

[0065] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0066] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0067] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0069] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising but not limited to, that is, it is open-ended and does not exclude the presence of additional features, structures, materials, or characteristics.

[0070] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present disclosure, and the ordinary skilled in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present disclosure.

Claims

1. A micro-mixing service nozzle characterized by, The micro-mix duty nozzle comprises: a first shell and a second shell, the first shell and the second shell extend along a first direction, and the first shell is sleeved on the second shell, an inner peripheral surface of the first shell and an outer peripheral surface of the second shell define a duty air passage, and an inner peripheral surface of the second shell defines a duty fuel passage; a cover plate, the cover plate is arranged at one end of the first shell in the first direction and one end of the second shell in the first direction to cover the duty air passage and the duty fuel passage, a plurality of micro-mix injection holes are arranged on the cover plate and spaced along the circumferential direction of the cover plate, the micro-mix injection holes extend along the direction from the inner end of the cover plate to the outer end of the cover plate and are arranged obliquely along the circumferential direction of the cover plate, the inlet ends of the plurality of micro-mix injection holes are communicated with the duty air passage, and a plurality of fuel supply branches extending along the radial direction of the cover plate are further arranged on the cover plate, the plurality of fuel supply branches are arranged along the circumferential direction of the second shell, the inlet ends of the plurality of fuel supply branches are communicated with the duty fuel passage, and the outlet ends of the plurality of fuel supply branches are communicated with the plurality of micro-mix injection holes correspondingly; in a projection plane perpendicular to the first direction, the center of the projection of the inlet end of the micro-mix injection hole and the center of the projection of the outlet end of the micro-mix injection hole are located on the same circumference with the center of the projection of the cover plate as the center, and the projection of the inlet end of the micro-mix injection hole and the projection of the outlet end of the micro-mix injection hole do not coincide; the cover plate has a cooling cavity, the plurality of micro-mix injection holes are arranged around the cooling cavity, the inner end surface of the cover plate is provided with a gas supply branch extending along the first direction, the gas supply branch communicates the cooling cavity with the duty air passage, and the outer end surface of the cover plate is provided with a plurality of first cooling injection holes, the first cooling injection holes extend along the first direction and are communicated with the cooling cavity; the flow area of the fuel supply branch is S3, at least part of the plurality of first cooling injection holes are distributed in rotational symmetry with the center of the cover plate, the flow area of the first cooling injection hole is S4, and S4 < S3.

2. The micro-pulse service nozzle of claim 1 wherein, the center axis of the micro-mix injection hole has an inclination angle relative to the first direction, the inclination angle is α, and 0 < α ≤ 80°.

3. The micro-pulse service nozzle of claim 1 wherein, the center axis of the fuel supply branch intersects with the center axis of the micro-mix injection hole.

4. The micro-pulse service nozzle of claim 1 wherein, the gas supply branch has a plurality of gas supply branches, the plurality of gas supply branches are arranged along the circumferential direction of the cover plate, and in the cross section of the cover plate, the gas supply branch and the fuel supply branch are arranged alternately along the circumferential direction of the cover plate.

5. The micro-pulse service nozzle of claim 1 wherein, the flow area of the micro-mix injection hole is S1, the flow area of the gas supply branch is S2, and S1 > S2 > S3.

6. The micro-pulse service nozzle of claim 1 wherein, a plurality of second cooling injection holes are arranged on the cover plate and penetrate the cover plate along the first direction, the plurality of second cooling injection holes are arranged around the plurality of micro-mix injection holes, and the inlet ends of the second cooling injection holes are communicated with the duty air passage.

7. A fuel nozzle characterized by, The micro-mix duty nozzle comprises: a micro-mix duty nozzle according to any one of claims 1-6. a fuel input pipe defining a fuel input passage which communicates with a duty fuel passage of the pilot fuel nozzle; an air input pipe which is fitted on the fuel input pipe, and an inner peripheral surface of which defines an air input passage which communicates with a duty air passage of the pilot fuel nozzle, between the outer peripheral surface of the fuel input pipe; a premix fuel input pipe which is fitted on the air input pipe, and an inner peripheral surface of which defines a premix fuel passage between the outer peripheral surface of the air input pipe, and which is provided with a plurality of premix fuel injection holes at one end thereof toward the pilot fuel nozzle, the plurality of premix fuel injection holes being disposed at intervals in a circumferential direction of the premix fuel input pipe.

8. A gas turbine engine characterized by, A fuel nozzle comprising the fuel nozzle according to claim 7.

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