Combustor

Abstract

The present disclosure provides a combustor comprising: an end plate; and a plurality of nozzle units arranged on the end plate, the plurality of nozzle units being configured to be arranged in axial and / or central symmetry about a center of the end plate, each of the plurality of nozzle units having a plurality of nozzles therein, the nozzles being adapted to contain a mixture of fuel and air to form an outgoing premixed gas; wherein at least one of the plurality of nozzle units has a portion of the nozzles therein configured to have different structural features from the other nozzles to cause the premixed gas mixed by the portion of the nozzles to form an outlet jet velocity and / or a premixing uniformity of the premixed gas that is different from the other nozzles to suppress a thermoacoustic coupling of a thermoacoustic oscillation generated by the combustor.

Description

Technical Field

[0001] At least one embodiment of this disclosure relates to the field of gas turbine technology, and more specifically, to a burner. Background Technology

[0002] Hydrogen, as a carbon-free clean energy source, is widely used as fuel for gas turbines because it helps meet current low-carbon emission requirements.

[0003] Hydrogen is chemically more reactive than current fuels (such as natural gas), exhibiting higher adiabatic flame temperatures, laminar flame velocities, and thermal diffusivity. When hydrogen mixes with air in the combustion chamber and undergoes subsequent combustion, the flame produced by the nozzles generates thermoacoustic oscillations at corresponding frequencies. Through the interaction of the nozzles, these oscillations undergo thermoacoustic coupling, leading to significant pressure pulsations in the burner. Severe pressure pulsations can even cause structural damage to the burner.

[0004] Therefore, how to suppress the thermoacoustic coupling caused by the thermoacoustic oscillations generated by each nozzle has become an urgent technical problem to be solved. Summary of the Invention

[0005] To address at least one technical problem mentioned above and in other aspects of the prior art, this disclosure provides a burner that reduces the interaction between nozzles and suppresses thermo-acoustic coupling by configuring a portion of the nozzles with a different structure from the other nozzles, thereby giving the portion of the nozzles different outlet jet velocities.

[0006] One aspect of the embodiments of this disclosure provides a burner, including: an end plate; and a plurality of nozzle units disposed on the end plate, the plurality of nozzle units being configured to be arranged axially and / or centrally symmetrically about the center of the end plate, each of the nozzle units having a plurality of nozzles, the nozzles being adapted to contain a fuel and air mixture to form an ejected premixed gas; wherein, at least a portion of the nozzles in at least one of the nozzle units are configured to have structural features different from those of the other nozzles, so that the premixed gas mixed through the nozzles forms an outlet jet velocity and / or a premixing uniformity of the premixed gas different from that of the premixed gas mixed through the other nozzles, thereby suppressing thermoacoustic coupling of thermoacoustic oscillations generated by the burner.

[0007] According to an embodiment of the present disclosure, the end plate is configured as a disc-shaped structure, and a plurality of nozzle units are arranged circumferentially on the end plate; wherein, a plurality of nozzles in each nozzle unit are arranged radially along the end plate, so that the burner has different outlet jet velocities along the radial direction of the end plate.

[0008] According to an embodiment of the present disclosure, the end plate is configured as a rectangular structure, and a plurality of nozzle units are arranged on the end plate along the transverse and longitudinal directions; wherein, the plurality of nozzles in each nozzle unit form a row and / or column array so that the burner has different outlet jet velocities along the length and / or width of the end plate.

[0009] According to an embodiment of the present disclosure, the nozzle includes: a body configured as a generally tubular structure, the interior of the body defining a mixing chamber; wherein the body is provided with a fuel injection port for receiving the fuel entering the mixing chamber, an air inlet port for receiving air entering the mixing chamber, and an outlet port for receiving premixed gas mixed in the mixing chamber and ejected from the body.

[0010] According to an embodiment of the present disclosure, one axial end of the body is provided with the fuel injection hole, which is suitable for guiding the fuel into the mixing chamber along the axial direction of the body. The other axial end of the body is provided with the outlet. An air inlet is provided on the side wall of the body between the fuel injection hole and the outlet, which is suitable for guiding the air into the mixing chamber along the radial direction of the body and mixing with the fuel.

[0011] According to an embodiment of the present disclosure, the above-mentioned body is provided with a plurality of air inlets, the plurality of air inlets are evenly spaced along the circumference of the above-mentioned body, and the plurality of air inlets located at the same axial position of the above-mentioned body form an air inlet array.

[0012] According to an embodiment of the present disclosure, at least two air intake hole arrays are disposed on the body, and the air intake holes in two adjacent air intake hole arrays are offset along the circumference of the body.

[0013] According to an embodiment of the present disclosure, the burner further includes a film gas hole disposed on the body downstream of the air inlet, which is adapted to guide air from the outside of the body into the mixing chamber and form a film gas on at least a portion of the inner wall of the mixing chamber.

[0014] According to embodiments of the present disclosure, a portion of the nozzles in each of the above-described nozzle units are configured such that the axial length of the body is different from that of the other nozzles.

[0015] According to an embodiment of this disclosure, the burner further includes a mounting plate that is spaced parallel to the end plate, and the side of the body with the outlet is mounted in the mounting plate.

[0016] According to embodiments of the present disclosure, a portion of the nozzles in each of the above-described nozzle units is configured such that the inner diameter of the body is different from that of the other nozzles.

[0017] According to embodiments of the present disclosure, a portion of the nozzles in each of the above-described nozzle units are configured such that the axial position of the air inlet provided in the body is different from that of the other nozzles.

[0018] According to embodiments of the present disclosure, a portion of the nozzles in each of the above-described nozzle units are configured such that the diameter of the air inlet provided in the body is different from that of the other nozzles.

[0019] According to the burner provided in this disclosure, a plurality of nozzle units are arranged on the end plate. A portion of the nozzles in the nozzle units are configured to have different structural features from other nozzles, so that the premixed gas mixed in the portion of the nozzles has a different outlet jet velocity than the other nozzles in the nozzle unit, so as to form thermoacoustic oscillations of different frequencies in the subsequent combustion process, thereby suppressing the thermoacoustic coupling of the thermoacoustic oscillations of different nozzles. Attached Figure Description

[0020] Figure 1 This is a front view of a burner according to an illustrative embodiment of the present disclosure, showing nozzle units arranged in a centrally symmetrical manner;

[0021] Figure 2 This is a front view of a burner according to another illustrative embodiment of the present disclosure, showing an axisymmetrically arranged nozzle unit;

[0022] Figure 3 This is a front view of a burner according to another illustrative embodiment of the present disclosure, showing nozzle units arranged in a manner that is both axisymmetric and centrosymmetric.

[0023] Figure 4 This is a cross-sectional view of the nozzle of a burner according to an embodiment of the present disclosure;

[0024] Figure 5 This is a cross-sectional view of a burner nozzle configuration according to an embodiment of the present disclosure, showing that at least a portion of the nozzles within the same nozzle unit are configured to have a different axial length from the other nozzles;

[0025] Figure 6 This is a cross-sectional view of another configuration of the nozzles of a burner according to an embodiment of the present disclosure, showing that at least a portion of the nozzles within the same nozzle unit are configured to have a different inner diameter than the other nozzles; and

[0026] Figure 7 This is a cross-sectional view of another configuration of the nozzles of a burner according to an embodiment of the present disclosure, showing that the air inlet of at least a portion of the nozzles within the same nozzle unit is configured to have a different axial position from the other nozzles.

[0027] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0028] 1. End plate;

[0029] 2. Nozzle;

[0030] 21. Ontology;

[0031] 22. Fuel intake chamber;

[0032] 23. Fuel injection port;

[0033] 24. Air intake vent;

[0034] 241. First air intake array;

[0035] 242. Second air intake array;

[0036] 25. Mixing chamber;

[0037] 26. Air film pores; and

[0038] 3. Mounting plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0040] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0041] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0042] When using expressions such as "at least one of A, B, and C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C. Similarly, when using expressions such as "at least one of A, B, or C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C.

[0043] Figure 1 This is a front view of a burner according to an illustrative embodiment of the present disclosure, showing nozzle units arranged in a centrally symmetrical manner. Figure 2 This is a front view of a burner according to another illustrative embodiment of the present disclosure, showing an axisymmetrically arranged nozzle unit. Figure 3 This is a front view of a burner according to another illustrative embodiment of the present disclosure, showing nozzle units arranged in a manner that is both axisymmetric and centrosymmetric.

[0044] According to the burner provided in this disclosure, such as Figures 1 to 3 As shown, the device includes an end plate 1 and multiple nozzle units disposed on the end plate 1. The multiple nozzle units are configured to be arranged axially and / or centrally symmetrically about the center of the end plate 1. Each nozzle unit has multiple nozzles 2, which are adapted to contain a fuel-air mixture to form an ejected premixed gas. At least one portion of the nozzles 2 in at least one nozzle unit is configured to have structural features different from the other nozzles 2, so that the premixed gas mixed through the nozzles 2 forms an outlet jet velocity and / or a premixing uniformity different from the premixed gas mixed through the other nozzles 2, thereby suppressing thermoacoustic coupling of thermoacoustic oscillations generated by the burner.

[0045] In one illustrative embodiment, the structural features of the nozzle include, but are not limited to, at least one of the following: the axial length of the nozzle body, the inner diameter of the nozzle body, and the axial position of the air inlet provided by the nozzle.

[0046] In this embodiment, a plurality of nozzle units are arranged on the end plate 1. By constructing a portion of the nozzles 2 in at least one nozzle unit with different structural features from the other nozzles 2, the internal structure of the nozzle unit and / or the nozzle unit and other nozzle units in the orthogonal projection direction of the end plate (e.g., Figure 1Different outlet jet velocities are formed in different parts of the end plate (facing the paper). Based on the different outlet jet velocities during the combustion of the premixed gas, local thermoacoustic oscillations (such as frequencies) different from those of other parts are formed in the orthogonal projection direction of the end plate (facing the paper). This can prevent mutual interference caused by the formation of thermoacoustic oscillations of the same frequency by the nozzles, thereby suppressing the thermoacoustic coupling of thermoacoustic oscillations of different nozzles.

[0047] According to embodiments of this disclosure, such as Figures 1 to 3 As shown, the end plate 1 is constructed as a disc-shaped structure, and multiple nozzle units are arranged circumferentially on the end plate 1. Multiple nozzles 2 in each nozzle unit are arranged radially along the end plate 1 so that the burner has different outlet jet velocities along the radial direction of the end plate 1.

[0048] In one illustrative embodiment, such as Figures 1 to 3 As shown, end plate 1 is constructed as a generally circular disc structure. Specifically, multiple nozzle units are arranged circumferentially on end plate 1. It should be understood that the embodiments of this disclosure are not limited thereto.

[0049] For example, end plate 1 can be constructed as an elliptical disk structure.

[0050] In one illustrative embodiment, such as Figure 1 and Figure 2 As shown, the burner includes a first nozzle unit and a second nozzle unit. Specifically, the first nozzle unit has multiple identical nozzles (i.e., have the same structural features) to ensure that the premixed gas mixed through each nozzle of the first nozzle unit has the same outlet jet velocity; a portion of the nozzles in the second nozzle unit have different structural features to ensure that the premixed gas mixed through the nozzles has different outlet jet velocities and / or different degrees of premixing uniformity.

[0051] In one illustrative embodiment, such as Figure 1 and Figure 2 As shown, the second nozzle unit includes three sets of nozzles. Specifically, two nozzles with the same structural features in the same set are positioned at the same radial position on the end plate 1, and three sets of nozzles with different structural features are arranged at radial intervals along the end plate 1.

[0052] In this embodiment, the configured first and second nozzle units locally generate different outlet jet velocities in the orthogonal projection direction (facing the paper) of the end plate 1. Furthermore, multiple sets of nozzles in the same second nozzle unit generate different outlet jet velocities along the radial direction of the end plate 1. Thus, during the combustion of the premixed gas, different thermoacoustic oscillations are generated locally in the circumferential and radial directions of the end plate 1, thereby reducing the interaction between the nozzles and suppressing the thermoacoustic coupling of the thermoacoustic oscillations.

[0053] In one illustrative embodiment, such as Figure 3 As shown, the burner includes multiple third nozzle units. Specifically, some nozzles within the third nozzle units have different structural features, resulting in different outlet jet velocities for the premixed gas passing through the nozzles.

[0054] In one illustrative embodiment, such as Figure 3 As shown, the third nozzle unit includes three groups of nozzles. Specifically, twelve nozzles with the same structural features in the same group are arranged at the same radial position on the end plate 1, and three groups of nozzles with different structural features are arranged at radial intervals along the end plate 1.

[0055] In this embodiment, the multiple sets of nozzles in the configured third nozzle unit form different outlet jet velocities along the radial direction of the end plate 1. Thus, during the combustion of the premixed gas, different thermoacoustic oscillations (such as having different frequencies and / or amplitudes) are locally formed in the radial direction of the end plate 1, thereby reducing the interaction between the nozzles and suppressing the thermoacoustic coupling of the thermoacoustic oscillations.

[0056] In one illustrative embodiment, the end plate 1 is configured as a circular structure. Specifically, the diameter of the end plate 1 is, but is not limited to, configured to be 20–40 mm. Furthermore, the end plate 1 is circumferentially arranged with a plurality of nozzle units, each nozzle unit including a plurality of nozzles 2 arranged radially at intervals.

[0057] In another illustrative embodiment, multiple nozzles 2 are arranged in a row array to form a nozzle unit. Nozzles 2 in the same row have the same structure, while nozzles in different rows have different structures. Furthermore, to optimize the suppression of thermoacoustic vibrations, the number of nozzles 2 with different structures needs to be limited, ensuring that the percentage of nozzles 2 with different structures does not exceed half of the total number of nozzles.

[0058] In one illustrative embodiment, the wall thickness of nozzle 2 is configured to be 1–2 mm, and the inner diameter of nozzle 2 is configured to be 5–10 mm. Furthermore, the spacing between adjacent nozzles is configured to be 2–4 times the nozzle inner diameter. It should be understood that the embodiments of this disclosure are not limited thereto.

[0059] For example, the spacing between multiple nozzles in the same nozzle unit and / or multiple nozzles in different nozzle units can be configured to be different from the spacing between other nozzles to form an asymmetrical structure on end plate 1.

[0060] For example, the end plate 1 can also be configured as rectangular, fan-shaped, or any other shape suitable for arranging the nozzles 2. According to an embodiment of the present disclosure, not shown in the figures, the end plate 1 is configured as a rectangular structure, and a plurality of nozzle units are arranged on the end plate 1 along the transverse and longitudinal directions. The plurality of nozzles 2 in each nozzle unit form a row and / or column array so that the burner has different outlet jet velocities along the length and / or width of the end plate 1.

[0061] In one illustrative embodiment, not shown in the figures, the end plate 1 is constructed as a generally square plate structure (i.e., the width (lateral dimension) and length (longitudinal dimension) are approximately the same). Specifically, the end plate is divided into four regions along its lateral and longitudinal centerlines, with the fourth and fifth nozzle units arranged in two diagonal regions. Furthermore, each fourth and fifth nozzle unit includes nine nozzles arranged in a three-row, three-column configuration, wherein one nozzle in the fifth nozzle unit is configured with a different structural feature.

[0062] In one illustrative embodiment, nozzles with different structural features are arranged in the middle of the other eight nozzles.

[0063] In another illustrative embodiment, nozzles with different structural features are arranged on the outer rows or columns.

[0064] In this implementation, the configured fifth nozzle unit forms different outlet jet velocities in the longitudinal and transverse and / or longitudinal directions of the end plate. Furthermore, the nine nozzles in the same fifth nozzle unit also form different outlet jet velocities in the transverse and / or longitudinal directions. Even further, two diagonally arranged fifth nozzle units can also be configured to have different outlet jet velocities (e.g., the nozzle in the middle of one fifth nozzle unit is configured with different structural features than the other nozzles, and the nozzles on the edge of another fifth nozzle unit are configured with different structural features than the other nozzles). Thus, during the premixed gas combustion process, not only are locally different thermoacoustic oscillations formed in various regions of the transverse and longitudinal directions of the end plate 1, but an asymmetrical structure is also formed in the orthographic projection direction of the end plate, thereby further reducing the interaction of thermoacoustic oscillations formed between nozzle units and suppressing the thermoacoustic coupling of thermoacoustic oscillations from different nozzles.

[0065] Figure 4 This is a cross-sectional view of the nozzle of a burner according to an embodiment of the present disclosure.

[0066] According to embodiments of this disclosure, such as Figure 4As shown, the nozzle 2 includes a body 21. The body 21 is constructed in a generally tubular shape, and the interior of the body 21 defines a mixing chamber 25. The body 21 is provided with a fuel injection port 23 for receiving fuel into the mixing chamber 25, an air inlet port 24 for receiving air into the mixing chamber 25, and an outlet port for receiving premixed air mixed in the mixing chamber 25 and ejected from the body 21.

[0067] According to embodiments of this disclosure, such as Figure 4 As shown, a fuel injection hole 23 is provided at one axial end of the body 21, which is suitable for guiding fuel into the mixing chamber 25 along the axial direction of the body 21. An outlet is provided at the other axial end of the body 21. An air inlet hole 24 is provided on the side wall of the body 21 between the fuel injection hole 23 and the outlet, which is suitable for guiding air into the mixing chamber 25 along the radial direction of the body 21 and mixing with the fuel.

[0068] In one illustrative embodiment, such as Figure 4 As shown, the body 21 is constructed as a generally cylindrical hollow tube. Specifically, one end of the body 21 along its axial direction (as shown) Figure 4 The lower end shown is provided with a baffle plate that divides the body into fuel intake chamber 22 (i.e. Figure 4 The cavity located below the partition) and the mixing cavity 25 (i.e. Figure 4 The cavity located above the partition is further configured to connect the fuel intake chamber 22 to an external fuel source (such as a hydrogen storage tank). The partition is provided with multiple fuel injection holes 23 to connect the fuel intake chamber 22 to the mixing chamber 25 and to accelerate the fuel (such as hydrogen, i.e., f1 accelerates to form f2) passing through the fuel injection holes 23 into the mixing chamber 25.

[0069] According to embodiments of this disclosure, such as Figure 4 As shown, the main body 21 is provided with a plurality of air inlet holes 24. The plurality of air inlet holes 24 are evenly spaced along the circumference of the main body 21, and the plurality of air inlet holes 24 located at the same axial position of the main body 21 form an air inlet hole array.

[0070] According to embodiments of this disclosure, such as Figure 4 As shown, the main body 21 is provided with at least two air inlet arrays, and the air inlets 24 in two adjacent air inlet arrays are offset along the circumference of the main body 21.

[0071] In one illustrative embodiment, such as Figure 4As shown, the body 21 includes, but is not limited to, configurations having two air intake hole arrays. Specifically, the air intake holes 24 of the first air intake hole array 241 and the second air intake hole array 242 are configured to be offset circumferentially along the body 21. Further, the air intake holes 24 are configured along the radial direction of the body 21 (e.g., ...). Figure 4 The left and right directions are shown in the diagram, indicating a through-type arrangement. It should be understood that the embodiments disclosed herein are not limited thereto.

[0072] For example, the main body 21 can be configured with three, four, five or other numbers of air intake arrays.

[0073] For example, the extension direction of the air intake hole can form an angle with the axial direction of the body 21.

[0074] In this embodiment, the air inlet 24 is suitable for connecting the mixing chamber to the external gas environment to introduce air into the mixing chamber. Furthermore, configuring multiple air inlets 24 as an array with different axial positions relative to the body 21 allows the fuel to mix with air multiple times and sequentially as it flows along the mixing chamber. This ensures thorough mixing of fuel and air while reducing the equivalence ratio of the premixed gas, which helps suppress backfire at the nozzle exit.

[0075] According to embodiments of this disclosure, such as Figure 4 As shown, the burner also includes a film gas hole 26 disposed on the body 21 downstream of the air inlet 24, which is adapted to guide air from the outside of the body 21 into the mixing chamber 25 and form a film gas on at least a portion of the inner wall of the mixing chamber 25.

[0076] In one illustrative embodiment, such as Figure 4 As shown, the portion of the body 21 downstream of the air inlet is provided with a plurality of film-forming holes 26. More specifically, the plurality of film-forming holes 26 located at the same axial position on the body 21 form a film-forming hole array. Further, the body 21 is provided with a plurality of film-forming hole arrays along the axial direction.

[0077] In this embodiment, during the process of the premixed gas passing through the film gas pore array, air can enter the mixing chamber 25 along the film gas pores 26 and flow along the flow direction of the mixed gas (e.g., ...). Figure 4 As shown from bottom to top, a gas film is formed near the nozzle outlet to isolate the flames at the outlets of adjacent nozzles, thereby reducing mutual disturbance of the flames between nozzles and helping to suppress backfire.

[0078] Figure 5 This is a cross-sectional view of a burner nozzle configuration according to an embodiment of the present disclosure, showing that at least a portion of the nozzles within the same nozzle unit are configured to have a different axial length from the other nozzles.

[0079] According to embodiments of this disclosure, such as Figure 5 As shown, a portion of the nozzles 2 in each nozzle unit are configured such that the axial length of the body 21 is different from that of the other nozzles 2.

[0080] According to embodiments of this disclosure, such as Figure 5 As shown, the burner also includes a mounting plate 3 that is spaced parallel to the end plate 1, and the body 21 with the outlet side is installed in the mounting plate 3.

[0081] In one illustrative embodiment, such as Figure 5 As shown, the nozzle unit includes, but is not limited to, three nozzles 2 with different axial lengths. Specifically, the lengths of the three nozzles 2 are configured as l1, l2, and l3, respectively, where l3 > l1 > l2. A larger l indicates a longer premixing chamber, resulting in more thorough premixing and a higher outlet jet velocity. Simultaneously, it reduces the equivalence ratio of the premixed gas, which helps suppress backfire at the nozzle outlet.

[0082] In one illustrative embodiment, such as Figure 5 As shown, to restrict the position of nozzle 2, a restriction is also placed at the end of nozzle 2 furthest from end plate 1 (e.g., Figure 5 The right end shown is provided with a mounting plate 3. Specifically, the mounting plate 3 is provided with through holes to accommodate the nozzle 2 extending into and / or exiting. Furthermore, the nozzle 2 is fixed to the mounting plate 3 by means of welding, screwing, or any other joining method.

[0083] In this implementation, all other things being equal, in response to the axial length of the nozzle, the longer the axial length of the nozzle, the higher the outlet jet velocity of the premixed gas passing through the nozzle. (Refer to...) Figure 5 As shown, the axial lengths of multiple nozzles within the same nozzle unit are all configured to be different, allowing each nozzle to have a different outlet jet velocity and a different combustion position, thereby reducing interference caused by adjacent nozzles during premixed gas combustion. Furthermore, the nozzles within the same nozzle unit are configured such that the outlet jet velocity of the nozzle located in the middle is different from the outlet jet velocities of the other nozzles located on either side of this nozzle. This allows the nozzles within the same nozzle unit to generate asymmetrical (i.e., nozzles on either side of the central nozzle with different structural features) thermoacoustic oscillations during premixed gas combustion, thus suppressing thermoacoustic coupling of the nozzles' thermoacoustic oscillations within the same nozzle unit.

[0084] Figure 6 This is a cross-sectional view of another configuration of the nozzles of a burner according to an embodiment of the present disclosure, showing that at least a portion of the nozzles within the same nozzle unit are configured to have a different inner diameter than the other nozzles.

[0085] According to embodiments of this disclosure, such as Figure 6 As shown, a portion of the nozzles 2 in each nozzle unit are configured such that the inner diameter of the body 21 is different from that of the other nozzles 2.

[0086] According to embodiments of this disclosure, such as Figure 6 As shown, a portion of the nozzles 2 in each nozzle unit are configured such that the diameter of the air inlet 24 provided in the body 21 is different from that of the other nozzles 2.

[0087] In one illustrative embodiment, such as Figure 6 As shown, the nozzle unit includes, but is not limited to, three nozzles 2. Specifically, the diameter of the air inlet 24 of the nozzle 2 located in the middle is configured to be larger than the diameter of the air inlet 24 of the nozzles located on both sides. Furthermore, the inner diameter (i.e., d1) of the body of the lower nozzle 2 is larger than the inner diameter (i.e., d2) of the body of the two nozzles 2 mentioned above.

[0088] In one illustrative embodiment, the outer diameter of the nozzle body 21 is, but is not limited to, configured to be 5 mm to 15 mm. Specifically, the inner diameter of the nozzle is configured to be substantially uniform along the axial direction. It should be understood that embodiments of this disclosure are not limited thereto.

[0089] For example, the inner diameter of the body 21 can be configured as a variable diameter structure.

[0090] In detail, the interior of the body 21 includes a throat segment, an expanding segment with an inner diameter larger than that of the throat segment, and / or a constricting segment with an inner diameter smaller than that of the throat segment. The connection between the expanding segment and the throat segment, and between the constricting segment and the throat segment, can form a smooth, arc-shaped transition. It should be understood that the embodiments of this disclosure are not limited thereto.

[0091] The inner diameter of the body 21 is designed to facilitate the mixing of the premixed gas, meet the outlet jet velocity requirements of the premixed gas, and enable the premixed gas to form a better flame shape during combustion.

[0092] In this implementation, all other things being equal, in response to the inner diameter of the nozzle body, the larger the inner diameter, the higher the outlet jet velocity of the premixed gas through the nozzle. In response to the orifice diameter of the air inlet of the nozzle, the larger the orifice diameter, the lower the outlet jet velocity of the premixed gas through the nozzle.

[0093] In this implementation, when the burner is limited by the space constraints of the installation location and cannot be configured with nozzles of different axial lengths, the overall design can be achieved by configuring the diameter of the air inlet of the nozzle and the inner diameter of the nozzle body to meet the design requirements of different nozzles having different outlet jet velocities. Among them, the nozzle 2 with a smaller inner diameter has a higher outlet jet velocity of the premixed gas through the nozzle, which is beneficial to improving the mixing uniformity.

[0094] Figure 7 This is a cross-sectional view of another configuration of the nozzles of a burner according to an embodiment of the present disclosure, showing that the air inlet of at least a portion of the nozzles within the same nozzle unit is configured to have a different axial position from the other nozzles.

[0095] According to embodiments of this disclosure, such as Figure 7 As shown, a portion of the nozzles 2 in each nozzle unit are configured such that the axial position of the air inlet 24 provided by the body 21 is different from that of the other nozzles 2.

[0096] In one illustrative embodiment, such as Figure 7 As shown, the nozzle unit includes, but is not limited to, three nozzles 2 with different axial positions of air inlets 24. Specifically, the distances between the air inlets 24 and the nozzle outlets of the three nozzles 2 are configured as L1, L2, and L3, respectively, where L1 > L2 > L3. A larger distance L between the air inlets 24 and the nozzle outlet results in a longer premixing section, greater flow resistance along the flow path, and a lower outlet jet velocity of the premixed gas through the nozzle, leading to slightly better mixing uniformity, but this is not absolute (because a lower velocity reduces turbulence intensity).

[0097] In this implementation, all other things being equal, the larger the distance between the air inlet 24 and the nozzle outlet, the higher the outlet jet velocity of the premixed gas through the nozzle.

[0098] In this implementation, the axial length of the nozzle body, the inner diameter of the nozzle body, and the axial position of the air inlet hole provided with the nozzle can be designed as a whole according to the required outlet jet velocity.

[0099] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of this disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this disclosure.

[0100] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A burner, characterized in that, include: End plate (1); as well as Multiple nozzle units are disposed on the end plate (1), the multiple nozzle units are configured to be arranged in an axisymmetric and / or centrally symmetrical manner with respect to the center of the end plate (1), each nozzle unit having multiple nozzles (2), the nozzles (2) being adapted to contain fuel and air mixture to form an ejected premixed gas; In this embodiment, at least one part of the nozzle (2) in the nozzle unit is configured to have structural features different from those of the other nozzles (2) so that the premixed gas mixed through the nozzle (2) forms an outlet jet velocity and / or a premixing uniformity of the premixed gas different from those of the other nozzles (2) in order to suppress the thermoacoustic coupling of the thermoacoustic oscillations generated by the burner. The nozzle (2) includes: The body (21) is constructed as a generally tubular structure, and the interior of the body (21) defines a mixing cavity (25). The body (21) is provided with a fuel injection port (23) for accommodating the fuel entering the mixing chamber (25), an air intake port (24) for accommodating the air entering the mixing chamber (25), and an outlet for accommodating the premixed gas after being mixed in the mixing chamber (25) and being ejected from the body (21). The nozzle unit includes three different nozzles (2). The diameter of the air intake port (24) of the nozzle (2) located in the middle is configured to be larger than the diameter of the air intake ports (24) of the nozzles located on both sides. The inner diameter of the body of the nozzle (2) located in the lower part is larger than the inner diameter of the body of the other two nozzles (2).

2. The burner according to claim 1, characterized in that, The end plate (1) is constructed as a disc-shaped structure, and a plurality of nozzle units are arranged circumferentially on the end plate (1); In each nozzle unit, a plurality of nozzles (2) are arranged radially along the end plate (1) so that the burner has different outlet jet velocities along the radial direction of the end plate (1).

3. The burner according to claim 1, characterized in that, The end plate (1) is constructed into a rectangular structure, and a plurality of nozzle units are arranged on the end plate (1) along the transverse and longitudinal directions; In each nozzle unit, a plurality of nozzles (2) form a row and / or column array to give the burner different outlet jet velocities along the length and / or width of the end plate (1).

4. The burner according to claim 1, characterized in that, The fuel injection hole (23) is provided at one end of the axial direction of the body (21), which is suitable for guiding the fuel into the mixing chamber (25) along the axial direction of the body (21). The outlet is provided at the other end of the axial direction of the body (21). The air inlet hole (24) is provided on the side wall of the body (21) between the fuel injection hole (23) and the outlet, which is suitable for guiding the air into the mixing chamber (25) along the radial direction of the body (21) and mixing with the fuel.

5. The burner according to claim 4, characterized in that, The main body (21) is provided with a plurality of air inlet holes (24), which are evenly spaced along the circumference of the main body (21). The plurality of air inlet holes (24) located at the same axial position of the main body (21) form an air inlet hole array.

6. The burner according to claim 5, characterized in that, The body (21) is provided with at least two air inlet arrays, and the air inlets (24) in two adjacent air inlet arrays are offset along the circumference of the body (21).

7. The burner according to claim 1, characterized in that, It also includes an air film hole (26) disposed on the body (21) downstream of the air inlet (24), which is adapted to guide air from the outside of the body (21) into the mixing chamber (25) and form an air film on at least a portion of the inner wall of the mixing chamber (25).

8. The burner according to any one of claims 4 to 7, characterized in that, A portion of the nozzles (2) in each nozzle unit is configured such that the axial length of the body (21) is different from that of the other nozzles (2).

9. The burner according to claim 8, characterized in that, It also includes a mounting plate (3) that is parallel and spaced apart from the end plate (1), and the body (21) with the outlet side is installed in the mounting plate (3).

10. The burner according to any one of claims 4 to 7, characterized in that, A portion of the nozzles (2) in each nozzle unit is configured such that the inner diameter of the body (21) is different from that of the other nozzles (2).

11. The burner according to any one of claims 4 to 7, characterized in that, A portion of the nozzles (2) in each nozzle unit are configured such that the axial position of the air inlet (24) provided by the body (21) is different from that of the other nozzles (2).

12. The burner according to any one of claims 4 to 7, characterized in that, A portion of the nozzles (2) in each of the nozzle units is configured such that the diameter of the air inlet (24) provided by the body (21) is different from that of the other nozzles (2).

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