Combustor capable of adjusting inclination angle and axial position of swirl vane in linkage mode and adjusting method of combustor

Abstract

The invention discloses a combustor capable of adjusting the inclination angle and the axial position of a swirl vane in a linkage mode and an adjusting method of the combustor. The combustor comprises a fixed center bluff body, a blade driving assembly capable of axially moving, a dip angle adjusting mechanism and an axial driving mechanism. Wherein the inclination angle of a rotational flow blade of the blade driving assembly can be continuously adjusted through a gear transmission mechanism, and meanwhile, the whole blade driving assembly can move in the axial direction through a limiting sleeve matched with a sliding rail groove in the fixed center bluff body, so that the adjustment of the axial position of the blade is achieved. Through cooperative work of two sets of independent mechanisms, two-degree-of-freedom accurate control over the rotational flow intensity and the mixing position of the combustor is achieved, and the problems that an existing rotational flow combustor is poor in adaptability to variable loads and multi-fuel working conditions due to a fixed structure or a single adjustment dimension are solved; the load adjusting range and the fuel adaptability of the combustor are remarkably widened, the combustion efficiency and the stability are improved, generation of nitric oxide is effectively inhibited, and important industrial application value is achieved.

Description

Technical Field

[0001] This invention relates to the field of combustion equipment technology, and in particular to a burner and its adjustment method capable of independently and in conjunction with adjusting the tilt angle and axial position of the swirl blades. Background Technology

[0002] Swirl burners are key components of various thermal power plants. They generate a high-intensity rotating jet of combustion air, forming stable inner and outer recirculation zones at the burner outlet. This entrains high-temperature flue gas, achieving rapid and stable ignition and enhanced combustion of the fuel. However, most existing swirl burners have fixed swirler structures, and the tilt angle (installation angle) and axial installation position of the swirling blades cannot be changed after manufacturing. This means the burner can only achieve optimal performance near its design operating point. When industrial boilers or gas turbines operate under variable load conditions (especially deep peak shaving), or when fuel characteristics (such as volatile matter content, calorific value, ash content, and reactivity) change significantly, traditional fixed-structure swirlers often experience unstable combustion (even flameout), decreased combustion efficiency, and excessive emissions of pollutants (especially thermal nitrogen oxides, NOx) because they cannot effectively adjust the combustion air dynamic field.

[0003] To improve the adaptability of combustion devices to load changes, some existing technologies employ adjustable swirl blade angles. By rotating the blades and changing their angle with the axis, the swirl intensity of the airflow can be adjusted, thereby optimizing the recirculation zone intensity to a certain extent to adapt to stable operation of the combustion device under different loads. However, this existing technology is a one-dimensional adjustment with a fundamental limitation: the axial position of the blades is fixed. This means that key parameters such as the initial mixing point of the fuel jet and swirling air, the relative axial positions and geometry of the inner and outer recirculation zones, cannot be optimized according to the operating conditions of the combustion device. For example, under low loads, simply increasing the swirl intensity may not be sufficient to form a sufficiently strong central recirculation zone to ensure stable combustion; under high loads, simply weakening the swirl intensity may not effectively achieve staged mixing of fuel and air to reduce NO. x Emissions. It is evident that the existing single-dimensional adjustable burners still fall short in terms of adjustment range, operating performance, and adaptability to complex operating conditions, making it difficult to meet the stringent requirements of modern industry for combustion equipment to be highly efficient, have a wide operating load range, low emissions, and strong adaptability. Summary of the Invention

[0004] In order to solve the above problems, the present invention aims to provide a burner with adjustable swirl blade tilt angle and axial position, and a method for adjusting the burner thereof.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a burner with adjustable swirl blade tilt angle and axial position, characterized in that it includes: a premixing chamber and a combustion chamber connected to each other, one end of the premixing chamber is provided with an air inlet and a fuel passage, the premixing chamber is provided with an adjustable swirl assembly, the adjustable swirl assembly includes a fixed central blunt body and a blade drive assembly integrated thereon, the blade drive assembly is connected to a tilt angle adjustment mechanism for adjusting the tilt angle of the swirl blades and an axial drive mechanism for adjusting the axial position of the swirl blades.

[0007] Furthermore, the burner with adjustable swirl blade tilt angle and axial position provided by the present invention may also have the following feature: wherein the fixed center blunt body includes a hollow blunt body pipe and a solid blunt body head connected to the front end of the hollow blunt body pipe.

[0008] Furthermore, the burner with adjustable swirl blade tilt angle and axial position provided by the present invention may also have the following feature: the head of the solid blunt body has a frustum-shaped structure, and its diameter gradually increases from the end near the premixing chamber towards the inlet of the combustion chamber.

[0009] Furthermore, the burner with adjustable tilt angle and axial position of the swirl blades provided by the present invention may also have the following features: the blade drive assembly is composed of several blade drive units with identical structures, each blade drive unit includes a tilt angle adjustment rod, one end of the tilt angle adjustment rod is fixedly connected to a driven gear, the other end of the tilt angle adjustment rod is fixedly connected to a limiting shaft, the end face of the limiting shaft is fixed with a swirl blade, a limiting sleeve is sleeved on the outer periphery of the limiting shaft, and several axially extending slide rail grooves are provided on the side wall of the hollow blunt body pipe. The limiting sleeve slides in cooperation with the slide rail grooves, so that the blade drive assembly slides along the slide rail grooves. The swirl blades are located outside the hollow blunt body pipe, and the tilt angle adjustment rod is located inside the hollow blunt body pipe.

[0010] Furthermore, the burner with adjustable swirl blade tilt angle and axial position provided by the present invention may also have the following features: the two side walls of the slide rail groove are symmetrically provided with limiting guide grooves, and multiple limiting guide grooves are arranged parallel to the axis of the slide rail groove and at equal intervals. The outer wall of the limiting sleeve has symmetrically arranged support rods. When the support rods are inserted into the limiting guide grooves, the blade drive assembly is limited and stationary within the slide rail groove.

[0011] Furthermore, the burner with adjustable swirl blade tilt angle and axial position provided by the present invention may also have the following feature: the surface of the slide rail groove is provided with a wear-resistant hard alloy coating.

[0012] Furthermore, the burner with adjustable swirl blade tilt angle and axial position provided by the present invention may also have the following features: wherein the tilt angle adjustment mechanism includes an adjustment rod, one end of the adjustment rod is located outside the premixing chamber and an adjustment handle is fixed to the end of the rod, the other end of the adjustment rod is located inside the premixing chamber and an axial rotating shaft is connected and fixed to the end of the rod, and a drive wheel is installed and fixed to the other end of the axial rotating shaft, and all driven gears mesh with the drive gear.

[0013] Furthermore, the burner with adjustable swirl blade tilt angle and axial position provided by the present invention may also have the following features: wherein the axial drive mechanism includes an axial sleeve, the axial sleeve is sleeved on the outer periphery of the axial rotating shaft, and a plurality of L-shaped limiting guide posts are fixedly fixed at intervals along the circumferential direction on the outer wall of the axial sleeve, and the other end of the L-shaped limiting guide post is connected and fixed to the outer wall of the limiting sleeve.

[0014] This invention also provides a method for adjusting the above-mentioned burner with adjustable swirl blade tilt angle and axial position, characterized by comprising the following steps:

[0015] S1. Obtain the current operating parameters of the burner;

[0016] S2. Based on the current operating parameters, determine the target tilt angle and target axial position of the swirl blades;

[0017] S3. Adjust the swirl blades to the target tilt angle by operating the tilt angle adjustment mechanism;

[0018] S4. By operating the axial drive mechanism, adjust the blade drive assembly and all swirl blades to the target axial position.

[0019] Furthermore, the adjustment method provided by this invention may also have the following features: step S2 determines the target tilt angle and target axial position of the swirl blades based on the current operating parameters, specifically including the following situations: when the load is less than 50% of the rated load, the target tilt angle is determined to be 40°-50°, and the target axial position is such that the leading edge of the swirl blades is located at a distance of 0.2D-0.3D from the premixing chamber outlet, where D is the premixing chamber diameter; when the load is 50%-80% of the rated load, the target tilt angle is determined to be 30°-40°, and the target axial position is the middle position; when the load is higher than 80% of the rated load, the target tilt angle is determined to be 20°-30°, and the target axial position is such that the leading edge of the swirl blades is located at a distance of 0.5D-0.6D from the premixing chamber outlet.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This invention realizes a dual-degree-of-freedom coordinated control mechanism for cyclone separator blades. By adjusting the tilt angle, rotating the blades changes the angle between them and the incoming flow direction, directly and continuously altering the tangential velocity component of the airflow after passing over the blades, thereby precisely controlling the swirl intensity of the airflow. The change in swirl intensity directly determines the intensity, size, and recirculation rate of the central recirculation zone at the burner outlet, which is the most critical factor affecting flame stability, especially low-load stable combustion capability. By independently controlling the axial position of the blade assembly through the axial drive mechanism, the initial mixing point of the swirl field and fuel can be changed, thereby controlling the fuel-air mixing process and the morphology of the inner and outer recirculation zones. Advancing or delaying the mixing point will significantly change the fuel-air mixing process, the position of the flame front, and the axial shape and relative size of the inner and outer recirculation zones. The two degrees of freedom can be adjusted independently to meet specific needs, and can also be preset for coordinated adjustment. This coordinated control capability allows the burner to actively and extensively "shape" the flow field that best meets the current operating conditions, which is unattainable by fixed or single-dimensional adjustable burners.

[0022] 2. This invention broadens the operating range of the combustion device. At low loads, the blade tilt angle can be increased and the blade assembly moved forward, creating a central recirculation zone with greater swirl intensity and return flow, closer to the flame root, thus achieving stable ignition. At high loads or when ultra-low NOx operation is required, the tilt angle can be decreased and the blade assembly moved backward, achieving staged mixing and combustion, and suppressing NOx formation. This flexible adjustment method significantly broadens the load adjustment range of the combustion device.

[0023] 3. This invention features a sophisticated and reliable structure with precise adjustment. It cleverly integrates rotary motion (tilt adjustment) and linear motion (axial adjustment) into a single component. Precise guidance is achieved through the cooperation of the limiting sleeve and the slide rail groove. The structure is compact and space-efficient. Tilt adjustment is achieved using gear transmission with a constant transmission ratio, ensuring precise and repeatable adjustment. The mechanical limiting guide groove ensures the synchronicity of multiple blades during adjustment, preventing airflow distortion caused by blade asynchrony, and provides physical limitation, ensuring safety and reliability.

[0024] 4. This invention transforms the burner from a passively adaptive device into an actively optimized system. It can continuously achieve the optimal dynamic balance between ignition stability, combustion efficiency, and pollutant emissions throughout the entire operational lifespan of the combustion unit. This has broad engineering application value and market prospects for promoting the clean, efficient, and flexible operation of gas turbines in my country and improving the energy-saving and environmental protection levels of various industrial boilers. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the burner with adjustable swirl blade tilt angle and axial position in an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the overall structure of the adjustable cyclone assembly in an embodiment of the present invention;

[0027] Figure 3 yes Figure 1 Longitudinal cross-sectional detail of the intermediate premixing chamber (red indicates the cross-section);

[0028] Figure 4 This is a schematic diagram of the gear transmission mechanism in an embodiment of the present invention;

[0029] Figure 5 yes Figure 3 A partially enlarged schematic diagram of the tilt adjustment rod and blade section;

[0030] Figure 6 This is an exploded view of the structure of the limiting sleeve and rotating shaft in the embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the longitudinal structure when the blade tilt angle is 30° in an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the longitudinal structure when the blade tilt angle is 50° in an embodiment of the present invention.

[0033] The markings in the diagram are: 1. Adjusting handle; 2. Adjusting rod; 3. Air inlet; 4. Fuel passage; 5. Premixing chamber; 6. Combustion chamber; 7. Hollow blunt body pipe; 8. Solid blunt body head; 9. Slide rail groove; 10. Limiting guide groove; 11. Swirl blade; 12. Driving gear; 13. Driven gear; 14. Tilt adjustment rod; 15. Limiting sleeve; 151. Support rod; 16. L-shaped limiting guide post; 17. Axial sleeve; 18. Limiting pivot; 19. Axial pivot. Detailed Implementation

[0034] To clearly illustrate the technical solution, design features, intended purpose, and technical effects of the present invention, the technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings and specific embodiments.

[0035] <Example 1>

[0036] See Figure 1 This embodiment provides a combustor with adjustable swirl blade tilt angle and axial position, comprising a premixing chamber 5 and a combustion chamber 6 connected to each other. One end of the premixing chamber 5 is provided with an air inlet 3 and a fuel passage 4. The air inlet 3 is used for air intake, and the fuel passage 4 is used for fuel intake. The premixing chamber 5 is equipped with an adjustable swirl assembly, which includes a fixed center blunt body, a blade drive assembly, a tilt angle adjustment mechanism, and an axial drive mechanism.

[0037] See Figure 2 and Figure 3The fixed-center bluff body is made of a high-temperature resistant casting alloy and includes a hollow bluff body pipe 7 and a solid bluff body head 8. The rear end of the hollow bluff body pipe 7 is fixedly connected to the front end plate of the premixing chamber 5 by welding, ensuring that its overall axial and radial positions are absolutely fixed during burner operation. The solid bluff body head 8 is connected to the front end of the hollow bluff body pipe 7. The solid bluff body head 8 has a frustum-shaped structure, and the diameter of the frustum-shaped structure gradually increases towards the inlet of the combustion chamber 6.

[0038] The hollow blunt-body pipe 7 has several parallel, axially extending slide rail grooves 9 evenly distributed on its sidewalls. The number of slide rail grooves 9 is the same as the number of swirl blades. The slide rail grooves 9 are rectangular long grooves, and their surfaces are coated with a wear-resistant hard alloy coating. See also... Figure 5 The slide rail groove 9 has symmetrical limit guide grooves 10 on both sides. Multiple limit guide grooves 10 are parallel to the axis of the slide rail groove 9 and are arranged at equal intervals.

[0039] See Figure 2 , Figures 4 to 6 The blade drive assembly consists of several identical blade drive units, which are evenly distributed circumferentially. Preferably, the number of blade drive units is 6-8, and in this embodiment, it is set to 8. Each group of blade drive units includes a driven gear 13, an inclination adjustment rod 14, a limiting sleeve 15, a limiting rotating shaft 18, and a swirl blade 11.

[0040] See Figure 4 and Figure 6 A swirl vane 11 is fixed to the front end of the limiting shaft 18, and the rear end of the limiting shaft 18 is fixedly connected to the tilt adjustment rod 14 to ensure that the limiting shaft 18, the tilt adjustment rod 14, and the swirl vane 11 rotate synchronously. The swirl vane 11 is made of a high-temperature resistant and wear-resistant nickel-based alloy material, and the limiting shaft 18 is made of high-strength stainless steel. The driven gear 13 is fixedly connected to the rear end of the tilt adjustment rod 14.

[0041] See Figures 4 to 6 A limiting sleeve 15 is fitted onto a limiting rotating shaft 18. The limiting sleeve 15 is an annular sleeve with supporting rods 151 symmetrically arranged. The limiting sleeve 15 is made of high-strength stainless steel. The limiting sleeve 15 is fitted onto the limiting rotating shaft 18 and is rotatably connected to it via a bearing rotor. The limiting sleeve 15 slides into the slide rail groove 9 of the hollow blunt body pipe, allowing the blade drive assembly to slide along the slide rail groove 9. When the supporting rods 151 of the limiting sleeve 15 are engaged in the limiting guide groove 10, the blade drive assembly is then limited and stationary within the slide rail groove 9. The sliding engagement of the limiting sleeve 15 with the slide rail groove 9 and the limiting guide groove 10 enables the linear movement of the blade drive assembly along the burner axis; while the blade drive assembly, through the bearing connection between the rotating shaft 18 and the limiting sleeve 15, enables independent rotational movement around the axis.

[0042] Eight swirl blades are located outside the hollow bluff body pipe 7, and eight tilt adjustment rods 14 are located inside the hollow bluff body pipe 7. The blade roots of the swirl blades 11 are fixed to the front protruding parts of the corresponding limiting shafts 18 by welding. Since the limiting shafts 18 are fixedly connected to the tilt adjustment rods 14, when the blade drive assembly rotates as a whole, it will drive all the swirl blades 11 to rotate synchronously around their respective limiting shafts 18, thereby realizing the synchronous adjustment of the blade installation tilt angle.

[0043] The tilt adjustment mechanism is used to drive the blade drive assembly to rotate, thereby adjusting the tilt angle. See also Figures 2 to 4 The tilt adjustment mechanism includes an adjusting rod 2, an adjusting handle 1, an axial rotating shaft 19, and a drive gear 12. One end of the adjusting rod 2 is located outside the premixing chamber 5, and the adjusting handle 1 is fixed to this end. The other end of the adjusting rod 2 is located inside the premixing chamber 5, and the axial rotating shaft 19 is connected and fixed to this end. The drive gear 12 is installed and fixed to the other end of the axial rotating shaft 19, ensuring that the axial rotating shaft 19 rotates synchronously with the adjusting rod 2 and the drive gear 12. All driven gears 13 mesh with the drive gear 12, and both the drive gear 12 and the driven gear 13 adopt a straight bevel gear (also known as a bevel gear) design. The drive gear 12 is fixed to the end of the axial rotating shaft 19, and its axis is parallel to the burner axis; the driven gear 13 is fixedly mounted on the end of the tilt adjustment rod 14 of the blade drive assembly, and its axis is perpendicular to the burner main axis. The axes of the two gears intersect perpendicularly at 90° in space, and the tooth surfaces adopt an equal-height tooth design to ensure smooth and efficient power transmission and direction conversion under intersecting axis conditions. This gear pair design not only converts the circumferential rotational motion applied by the operator to the adjustment handle 1 into radial torque that drives the blade assembly to rotate, completing a 90-degree change in the transmission direction, but also increases the output torque through a reasonable gear ratio, making the tilt angle adjustment operation more effortless.

[0044] In this embodiment, rotating the adjustment handle 1 transmits power through the adjustment rod 2 and the axial shaft 19, driving the drive gear 12 to rotate, which in turn drives the driven gear 13 meshing with it to rotate. The driven gear 13 drives the entire blade drive assembly (all blade drive units) to rotate together, ultimately achieving synchronous changes in the tilt angle of all swirl blades 11.

[0045] The axial drive mechanism is used to drive the entire blade drive assembly to move axially linearly along the slide rail groove 9, thereby changing the axial installation position of the swirl blade assembly. See also Figure 3 and Figure 4The axial drive mechanism includes an axial sleeve 17 and L-shaped limiting guide posts 16. The axial sleeve 17 is sleeved on the axial shaft 19 at the root of the adjusting rod 2 and is rotatably connected to the axial shaft 19 via a bearing rotor. The diameters of both the axial sleeve 17 and the axial shaft 19 are smaller than those of the adjusting rod 2, and their function is to fix the axial position of the axial sleeve and provide torque for axial sliding. Several L-shaped limiting guide posts 16 are fixedly fixed circumferentially along the outer wall of the axial sleeve 17, and the other end of the L-shaped limiting guide posts 16 is connected and fixed to the outer wall of the limiting sleeve 15.

[0046] In this embodiment, pulling the adjusting handle 1 along the axis transmits power through the adjusting rod 2. The linear motion of the adjusting rod 2 is transmitted to the L-shaped limiting guide post 16 through the axial sleeve 17, thereby driving the entire blade drive assembly to move precisely axially along the slide rail groove 9 inside the hollow blunt body pipe 7. This mechanism is mechanically decoupled from the tilt angle adjustment mechanism, and they do not interfere with each other, realizing independent control of the two functions of tilt angle adjustment and axial position adjustment of the swirl blade.

[0047] <Example 2>

[0048] This embodiment provides a method for adjusting the above-mentioned burner with adjustable swirl blade tilt angle and axial position, which includes the following steps:

[0049] S1. Obtain the current operating parameters of the burner;

[0050] S2. Based on the current operating parameters, determine the target tilt angle and target axial position of the swirl blades, specifically including the following scenarios:

[0051] When the load is less than 50% of the rated load, the target tilt angle is determined to be 40°-50°, and the target axial position is such that the leading edge of the swirl blade is located 0.2D-0.3D from the outlet of the premixing chamber 5, where D is the diameter of the premixing chamber 5.

[0052] When the load is 50%-80% of the rated load, the target tilt angle is determined to be 30°-40°, and the target axial position is the middle position;

[0053] When the load is higher than 80% of the rated load, the target tilt angle is determined to be 20°-30°, and the target axial position is such that the leading edge of the swirl blade is located 0.5D-0.6D from the outlet of the premixing chamber 5.

[0054] S3. Adjust the swirl blades to the target tilt angle by operating the tilt angle adjustment mechanism;

[0055] S4. By operating the axial drive mechanism, adjust the blade drive assembly and all swirl blades to the target axial position.

[0056] See Figure 7 and Figure 8The diagrams illustrate the longitudinal structures when the blade tilt angle is 30° and 50°, respectively.

[0057] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A burner with adjustable swirl blade tilt angle and axial position, and its adjustment method, characterized in that, include: The premixing chamber and the combustion chamber are connected. One end of the premixing chamber is provided with an air inlet and a fuel passage. The premixing chamber is provided with an adjustable swirling assembly. The adjustable swirling assembly includes a fixed central blunt body and a blade drive assembly integrated thereon. The blade drive assembly is connected to an angle adjustment mechanism for adjusting the tilt angle of the swirling blades and an axial drive mechanism for adjusting the axial position of the swirling blades.

2. The burner and its adjustment method with adjustable swirl blade tilt angle and axial position as described in claim 1, characterized in that: The fixed-center bluff body includes a hollow bluff body pipe and a solid bluff body head connected to the front end of the hollow bluff body pipe.

3. The burner with adjustable swirl blade tilt angle and axial position as described in claim 2, characterized in that: The head of the solid blunt body has a frustum-shaped structure, and the diameter of the frustum-shaped structure gradually increases towards the inlet of the combustion chamber.

4. The burner with adjustable swirl blade tilt angle and axial position as described in claim 2, characterized in that: The blade drive assembly consists of several blade drive units with identical structures. Each blade drive unit includes a tilt adjustment rod, one end of which is fixedly connected to a driven gear, and the other end of which is fixedly connected to a limit shaft. A swirl blade is fixed to the end face of the limit shaft, and a limit sleeve is provided on the outer periphery of the limit shaft. The hollow bluff body pipe has several axially extending slide rail grooves on its sidewall. The limiting sleeve slides into the slide rail grooves, allowing the blade drive assembly to slide along the slide rail grooves. The swirl blades are located outside the hollow blunt body pipe, and the tilt adjustment rod is located inside the hollow blunt body pipe.

5. The burner with adjustable swirl blade tilt angle and axial position as described in claim 4, characterized in that: The slide rail groove has symmetrically arranged limit guide grooves on both sides, and the plurality of limit guide grooves are arranged parallel to the axis of the slide rail groove and at equal intervals. The outer wall of the limiting sleeve has symmetrically arranged support rods. When the support rods are inserted into the limiting guide groove, the blade drive assembly is limited and stationary within the slide rail groove.

6. The burner with adjustable swirl blade tilt angle and axial position as described in claim 4, characterized in that: The surface of the slide rail groove is coated with a wear-resistant hard alloy.

7. The burner with adjustable swirl blade tilt angle and axial position as described in claim 4, characterized in that: The tilt adjustment mechanism includes an adjustment rod. One end of the adjustment rod is located outside the premixing chamber and an adjustment handle is fixed to that end. The other end of the adjustment rod is located inside the premixing chamber and an axial rotating shaft is connected and fixed to that end. A drive gear is installed and fixed to the other end of the axial rotating shaft, and all the driven gears mesh with the drive gear.

8. The burner with adjustable swirl blade tilt angle and axial position as described in claim 7, characterized in that: The axial drive mechanism includes an axial sleeve, which is sleeved on the outer periphery of the axial shaft. Several L-shaped limiting guide posts are fixedly fixed at circumferential intervals on the outer wall of the axial sleeve, and the other end of the L-shaped limiting guide posts is connected and fixed to the outer wall of the limiting sleeve.

9. A method for adjusting a burner with adjustable swirl blade tilt angle and axial position as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Obtain the current operating parameters of the burner; S2. Based on the current operating parameters, determine the target tilt angle and target axial position of the swirl blade; S3. By operating the tilt angle adjustment mechanism, adjust the swirl blades to the target tilt angle; S4. By operating the axial drive mechanism, adjust the blade drive assembly and all swirl blades to the target axial position.

10. The adjustment method as described in claim 9, characterized in that: in, Step S2 determines the target tilt angle and target axial position of the swirl blades based on the current operating parameters, specifically including the following scenarios: When the load is less than 50% of the rated load, the target tilt angle is determined to be 40°-50°, and the target axial position is such that the leading edge of the swirl blade is located at a distance of 0.2D-0.3D from the outlet of the premixing chamber, where D is the diameter of the premixing chamber; When the load is 50%-80% of the rated load, the target tilt angle is determined to be 30°-40°, and the target axial position is such that the leading edge of the swirl blade is located at a distance of 0.3D-0.5D from the outlet of the premixing chamber. When the load is higher than 80% of the rated load, the target tilt angle is determined to be 20°-30°, and the target axial position is such that the leading edge of the swirl blade is located at a distance of 0.5D-0.6D from the outlet of the premixing chamber.

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