A high turndown ratio low-nitrogen burner

Abstract

The application provides a high-adjustment-ratio low-nitrogen combustor, comprising a central combustion unit, a plurality of premix combustion units, a combustion air supply unit and a combustion air baffle mechanism. By arranging the openable and closable combustion air baffle mechanism, the switching of the high and low power modes of the combustor is realized. In the high load mode, the premix cylinder air inlet is unobstructed, the gas and combustion air are fully premixed, the flame temperature is uniform, the combustion is sufficient, the advantages of low-nitrogen emission and high thermal efficiency of premix combustion are continued; in the low load mode, the premix cylinder air inlet is closed, the backfire safety hazard in low power operation is avoided, the combustion temperature is stable under the low load condition, the generation of carbon monoxide is effectively inhibited, the low load combustion condition is greatly optimized, the power adjustment ratio of the combustor is greatly improved from the traditional 4:1 to more than 20:1, the wide load and high adjustment ratio operation is realized, more working condition scenes are adapted, and the low-nitrogen environmental protection, operation safety and combustion efficiency are considered.

Description

Technical Field

[0001] This invention relates to the field of burner technology, specifically a high-tuning-ratio, low-NOx burner. Background Technology

[0002] The core design principle of low-NOx burners is to reduce the formation of nitrogen oxides (NOx) by controlling flame temperature and optimizing the combustion process. They employ a premixed combustion mode, where the fuel gas and combustion air are thoroughly and uniformly mixed before being introduced into the combustion zone. This mode ensures a uniform and stable flame temperature distribution, eliminating localized high-temperature points and fundamentally suppressing NOx formation while also improving combustion efficiency.

[0003] For example, Chinese patent document CN120947024A discloses a dual-fuel low-NOx burner. In this burner, multiple premixing cylinders are arranged in a ring array around the central ignition unit. Most of the fuel gas and combustion air are first thoroughly and uniformly mixed in the outer premixing cylinders before combustion in the combustion zone at the burner head. This type of burner has a high heat load and a uniform and stable flame temperature. However, premixed combustion also has significant drawbacks: the control ratio is relatively low, with a typical premixed combustion control ratio of approximately 4:1 (the ratio of maximum operating power to minimum operating power). When the burner's operating power falls below this lower limit of the control ratio, only combustion in the central ignition unit is maintained. At this time, the large amount of combustion air in the premixing cylinders can easily cause backfire, posing a safety hazard. Furthermore, the excessive air cooling can affect combustion efficiency and easily produce large amounts of carbon monoxide. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a high-tuning-ratio low-NOx burner.

[0005] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is: a high-adjustment-ratio low-NOx burner, comprising: A central combustion unit is located at the center of the gasifier. The central combustion unit includes a central cylinder, a central fuel supply pipe, and an ignition gun. The central fuel supply pipe and the ignition gun axially penetrate the inner cavity of the central cylinder. Multiple premixed combustion units, each premixed combustion unit includes a premixing cylinder and a premixed fuel distribution pipe, the front end of each premixed fuel distribution pipe extends to the inner cavity of the corresponding premixing cylinder, and the multiple premixing cylinders are distributed in a circumferential array around the central cylinder. A combustion air supply unit includes a combustion air duct that surrounds the rear of a central cylinder and a premixing cylinder. Combustion-supporting wind deflector mechanism, which is used to control the opening and closing of the rear ports of each premixing cylinder; When the burner is in the first power mode, both the central fuel supply pipe and the premixed fuel distribution pipe supply fuel. The combustion air baffle mechanism controls the opening of the rear ports of each premixing cylinder. Part of the combustion air enters the inner cavity of the premixing cylinder from the rear port of the combustion air duct, and another part of the combustion air enters the inner cavity of the central cylinder from the hole at the rear of the central cylinder. When the burner is in the second power mode, the premixed fuel distribution pipe stops supplying fuel, and only the central fuel supply pipe supplies fuel. The combustion air baffle mechanism controls the rear port of each premixed cylinder to close to prevent the combustion air from entering the inner cavity of the premixed cylinder. The combustion air from the combustion air duct enters the inner cavity of the central cylinder from the hole in the rear part of the central cylinder.

[0006] This invention achieves switching between high and low power modes of the burner by setting up an openable and closable combustion air baffle mechanism. In the high-load first power mode, the premixing cylinder air intake is unobstructed, and the fuel gas and combustion air are fully premixed, ensuring uniform flame temperature and complete combustion, continuing the advantages of premixed combustion such as low nitrogen emissions and high thermal efficiency. In the low-load second power mode, the premixing cylinder air intake channel can be completely closed, eliminating the problem of a large amount of combustion air remaining in the premixing cylinder, and fundamentally avoiding the backfire safety hazard during low-power operation. At the same time, it avoids the cooling effect of excess cold air on the combustion flame, ensuring stable combustion temperature under low-load conditions, effectively suppressing carbon monoxide generation, and significantly optimizing low-load combustion conditions. The burner power regulation ratio is greatly improved from the traditional 4:1 to over 20:1, achieving wide-load, high regulation ratio operation, adapting to more operating scenarios, and taking into account low nitrogen environmental protection, operational safety, and high combustion efficiency.

[0007] Furthermore, the combustion-supporting wind deflector mechanism includes an opening and closing drive mechanism and multiple wind deflector units. The number of wind deflector units is the same as the number of premixing cylinders. One wind deflector unit is provided between the rear ports of adjacent premixing cylinders. The opening and closing drive mechanism is used to drive multiple wind deflector units to open or close synchronously.

[0008] By adopting the above-mentioned preferred scheme, the synchronous opening and closing of the downstream ports of all premixing cylinders can be achieved, ensuring that the air intake state of each premixing cylinder is completely consistent, and avoiding problems such as flame deviation and uneven combustion caused by abnormal air intake of a single cylinder.

[0009] Furthermore, each wind deflector unit includes a first wind deflector and a second wind deflector, both of which are pivotally mounted at the rear port of the premixing cylinder. When the wind deflector unit is in the closed state, the first wind deflector and the second wind deflector are on the same plane and cover the rear port of the premixing cylinder. When the wind deflector unit is in the open state, the first wind deflector and the second wind deflector pivotally flip back.

[0010] The preferred scheme described above employs a double-baffle split-type pivot structure, which can smoothly avoid the obstruction of the premixed fuel distribution pipe in the middle of the premixing cylinder. The opening and closing stroke is small and the operation is flexible, which can quickly complete the sealing and conduction switching of the premixing cylinder port.

[0011] Furthermore, each windbreak unit also includes a first fixed plate, a second fixed plate, a first arc-shaped crank, a second arc-shaped crank, a balance support plate, and a chain rod mechanism. The first fixed plate and the second fixed plate are fixedly installed on the combustion air duct wall at the rear port of the premixing cylinder. The first windbreak plate and the second windbreak plate are both pivotally connected between the first fixed plate and the second fixed plate. The first windbreak plate and the second windbreak plate are each provided with connecting ears offset from their respective pivot axes. One end of the first arc-shaped crank is hinged to the connecting ear of the first windbreak plate, and the other end of the first arc-shaped crank is hinged to one end of the balance support plate. One end of the second arc-shaped crank is hinged to the connecting ear of the second windbreak plate, and the other end of the second arc-shaped crank is hinged to the other end of the balance support plate. One end of the chain rod mechanism is hinged to the middle position of the balance support plate.

[0012] By adopting the above-mentioned preferred scheme, a linkage transmission structure is formed by using symmetrically arranged arc-shaped cranks in conjunction with a balance plate and a chain rod mechanism. This structure can accurately convert the linear tension of the chain rod mechanism into the synchronous pivoting power of the two wind deflectors, resulting in balanced force and good motion synchronization during the transmission process.

[0013] Furthermore, the opening and closing drive mechanism includes a linear drive device, multiple connecting rods, multiple triangular rotating disks, and multiple fixed columns. The number of connecting rods, triangular rotating disks, and fixed columns is consistent with the number of premixing cylinders. The fixed columns are fixedly installed on the rear wall of the combustion-supporting air duct. The connecting rods and triangular rotating disks are sequentially and spaced apart to form a polygonal linkage ring. The first corner of the triangular rotating disk is hinged to the fixed column, the second corner of the triangular rotating disk is hinged to the first end of one connecting rod, and the third triangular part of the triangular rotating disk is hinged to the second end of another connecting rod. The other end of each link mechanism is hinged to one connecting rod. The telescopic rod end of the linear drive device is hinged to one of the connecting rods. The base of the linear drive device is hinged to the wall of the combustion-supporting air duct.

[0014] By adopting the above-mentioned preferred scheme, a ring-shaped linkage structure consisting of a linear drive mechanism, a triangular rotating disk, and a connecting rod is used. This effectively avoids intermediate fuel pipelines, and the entire polygonal linkage ring can be driven to move synchronously by a single drive source, thereby driving all wind-blocking units to open and close synchronously, greatly simplifying the drive structure. The overall linkage structure is stably installed, has strong wind load resistance, and can adapt to the complex wind field environment inside the burner.

[0015] Furthermore, the first and second wind deflectors have a semi-circular notch at their joint when closed to avoid the premixed fuel distribution pipe.

[0016] By adopting the above-mentioned preferred solution, the premixed fuel distribution pipe can be precisely avoided by setting a semi-circular notch, thus preventing hard interference and squeezing between the wind deflector and the pipeline when the deflector is closed.

[0017] Furthermore, the connection line between the first and second wind deflectors in their closed state points radially toward the axis of the central cylinder.

[0018] By adopting the above-mentioned preferred scheme, the layout of the wiring along the radial direction of the central cylinder axis makes the force structure of the double wind deflector symmetrical and optimizes the synchronous movement effect of the double deflector.

[0019] Furthermore, the fixed column is parallel to the burner axis, the triangular rotating disk is perpendicular to the fixed column, and the contour formed by the multiple connecting rods is located outside the contour formed by the multiple fixed columns.

[0020] By adopting the above-mentioned preferred scheme, the overall external layout of the connecting rod can effectively avoid the internal air duct of the combustion air duct, prevent the linkage structure from blocking or interfering with the combustion air flow, and ensure smooth air duct and stable air intake.

[0021] Furthermore, the first and second arc-shaped cranks on the same windshield unit are arranged symmetrically to each other.

[0022] Furthermore, the length of the chain mechanism is adjustable, and it is locked by a locking sleeve after being adjusted to a preset length.

[0023] By adopting the above-mentioned preferred solution, the chain length can be precisely adjusted according to the actual assembly conditions, and the opening and closing stroke and closing fit of the wind baffle can be adjusted to ensure that all wind baffle units can be completely sealed after closing and maximize the flow area after opening. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of one embodiment of the burner of the present invention.

[0026] Figure 2 This is a cross-sectional view of one embodiment of the burner of the present invention.

[0027] Figure 3 This is one of the structural schematic diagrams of the burner concealing the combustion-supporting air duct of the present invention.

[0028] Figure 4This is the second schematic diagram of the structure of the burner concealing the combustion-supporting air duct of the present invention.

[0029] Figure 5 This is a schematic diagram of the wind deflector of the combustion-supporting wind deflector mechanism in the open state.

[0030] Figure 6 This is a schematic diagram of the combustion wind deflector mechanism with the deflector in the closed state.

[0031] The numbers and letters in the diagram represent the names of the corresponding components: 10-Central combustion unit; 11-Central cylinder; 12-Central fuel supply pipe; 13-Ignition gun; 20 - Premixed combustion unit; 21 - Premixing cylinder; 22 - Premixed fuel distribution pipe; 30 - Combustion air supply unit; 31 - Combustion air duct; 40 - Combustion-supporting wind deflector mechanism; 42 - Wind deflector unit; 421 - First wind deflector plate; 4211 - Connecting ear; 4212 - Semi-circular notch; 422 - Second wind deflector plate; 423 - First fixing plate; 424 - Second fixing plate; 425 - First arc-shaped crank; 426 - Second arc-shaped crank; 427 - Balance support plate; 428 - Chain rod mechanism; 44 - Opening and closing drive mechanism; 441 - Linear drive device; 442 - Connecting rod; 4421 - First end; 4422 - Second end; 443 - Triangular rotating disk; 4431 - First corner; 4432 - Second corner; 4433 - Third corner; 444 - Fixed column. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figure 1-6 As shown, one embodiment of the present invention is: a high-tuning-ratio low-NOx burner, comprising: The central combustion unit 10 is located at the center of the gasifier. The central combustion unit 10 includes a central cylinder 11, a central fuel supply pipe 12, and an ignition gun 13. The central fuel supply pipe 12 and the ignition gun 13 axially penetrate the inner cavity of the central cylinder 11. Multiple premixed combustion units 20, each premixed combustion unit 20 includes a premixing cylinder 21 and a premixed fuel distribution pipe 22, the front end of each premixed fuel distribution pipe 22 extends into the inner cavity of the corresponding premixing cylinder 21, and the multiple premixing cylinders 21 are arranged in a circumferential array around the central cylinder 11. Combustion air supply unit 30 includes combustion air duct 31, which surrounds the rear of central cylinder 11 and premixing cylinder 21; Combustion-supporting windbreak mechanism 40, which is used to control the opening and closing of the rear ports of each premixing cylinder 21; When the burner is in the first power mode, both the central fuel supply pipe 12 and the premixed fuel distribution pipe 22 supply fuel. The combustion air baffle mechanism 40 controls the rear port of each premixed cylinder 21 to open. Part of the combustion air from the combustion air duct 31 enters the inner cavity of the premixed cylinder 21 from the rear port of the premixed cylinder 21, and another part of the combustion air enters the inner cavity of the central cylinder 11 from the hole at the rear of the central cylinder 11. When the burner is in the second power mode, the premixed fuel distribution pipe 22 stops supplying fuel, and only the central fuel supply pipe 12 supplies fuel. The combustion air baffle mechanism 40 controls the rear port of each premixed cylinder 21 to close to prevent the combustion air from entering the inner cavity of the premixed cylinder 21. The combustion air from the combustion air duct 31 enters the inner cavity of the central cylinder 11 from the hole in the rear part of the central cylinder 11.

[0034] The beneficial effects of adopting the above technical solution are as follows: By setting an openable and closable combustion air baffle mechanism, the high and low power modes of the burner can be switched. In the high-load first power mode, the premixing cylinder air intake is unobstructed, and the gas and combustion air are fully premixed, ensuring uniform flame temperature and complete combustion, thus continuing the advantages of premixed combustion such as low nitrogen emissions and high thermal efficiency. In the low-load second power mode, the premixing cylinder air intake channel can be completely closed, eliminating the problem of a large amount of combustion air remaining in the premixing cylinder, and fundamentally avoiding the backfire safety hazard during low-power operation. At the same time, it avoids the cooling effect of excess cold air on the combustion flame, ensuring stable combustion temperature under low-load conditions, effectively suppressing carbon monoxide generation, significantly optimizing low-load combustion conditions, and greatly increasing the burner power regulation ratio from the traditional 4:1 to over 20:1, achieving wide-load, high regulation ratio operation, adapting to more operating scenarios, and taking into account low nitrogen environmental protection, operational safety, and high combustion efficiency.

[0035] Taking a low-NOx burner with a maximum power of 30MW and a ring array premixing cylinder as an example, the existing low-NOx burner without a combustion air baffle mechanism has a regulation ratio of about 4:1, and the minimum adjustable power is 7.5MW. By adopting the technical solution of this application and configuring a combustion air baffle mechanism, in high-load mode, the combustion air baffle mechanism opens, allowing the combustion air to enter the premixing cylinder and mix with the gas before participating in combustion, achieving a maximum power of 30MW. When low-load mode is required, the combustion air entering the premixing cylinder is closed by the combustion air baffle mechanism. Without the influence of external combustion air, the power of the central combustion unit can be adjusted to 1MW or even lower, with stable combustion, and the regulation ratio is increased to over 30:1.

[0036] In other embodiments of the present invention, the combustion air baffle mechanism 40 includes an opening and closing drive mechanism 44 and multiple baffle units 42. The number of baffle units 42 is the same as the number of premixing cylinders 21. One baffle unit 42 is respectively arranged between the rear ports of adjacent premixing cylinders 21. The opening and closing drive mechanism 44 is used to drive multiple baffle units 42 to open or close synchronously. The beneficial effect of adopting the above technical solution is that it can realize the synchronous opening and closing of the rear ports of all premixing cylinders, ensure that the air intake state of each premixing cylinder is completely consistent, and avoid flame deviation and uneven combustion caused by abnormal air intake of a single cylinder.

[0037] like Figure 5 , 6 As shown, in some embodiments of the present invention, each wind deflector unit 42 includes a first wind deflector plate 421 and a second wind deflector plate 422, both of which are pivotally mounted at the rear port of the premixing cylinder 21. When the wind deflector unit 42 is in the closed state, the first wind deflector plate 421 and the second wind deflector plate 422 are on the same plane and cover the rear port of the premixing cylinder 21. When the wind deflector unit 42 is in the open state, the first wind deflector plate 421 and the second wind deflector plate 422 pivotally flip back. The beneficial effects of the above technical solution are: the use of a double-wind deflector plate split-opening pivoting structure can smoothly avoid the obstruction of the premixed fuel distribution pipe in the middle of the premixing cylinder, the opening and closing stroke is small, the action is flexible, and the sealing and conduction switching of the premixing cylinder port can be completed quickly.

[0038] like Figure 5 , 6 As shown, in other embodiments of the present invention, each windbreak unit 42 further includes a first fixing plate 423, a second fixing plate 424, a first arc-shaped crank 425, a second arc-shaped crank 426, a balance support plate 427, and a chain rod mechanism 428. The first fixing plate 423 and the second fixing plate 424 are fixedly installed on the combustion air duct wall at the rear port of the premixing cylinder. The first windbreak plate 421 and the second windbreak plate 422 are both pivotally connected between the first fixing plate 423 and the second fixing plate 424. The first windbreak plate 421... Both the first and second windshields 422 are provided with connecting ears 4211 offset from their respective pivot axes. One end of the first arc-shaped crank 425 is hinged to the connecting ear of the first windshield 421, and the other end of the first arc-shaped crank 425 is hinged to one end of the balance plate 427. One end of the second arc-shaped crank 426 is hinged to the connecting ear of the second windshield 422, and the other end of the second arc-shaped crank 426 is hinged to the other end of the balance plate 427. One end of the chain rod mechanism 428 is hinged to the middle position of the balance plate 427. The beneficial effect of adopting the above technical solution is that by using symmetrically arranged arc-shaped cranks in conjunction with the balance plate and chain rod mechanism to form a linkage transmission structure, the linear tension of the chain rod mechanism can be accurately converted into the synchronous pivoting power of the two windshields, resulting in balanced force and good motion synchronization during the transmission process.

[0039] like Figure 5 , 6 As shown, in some other embodiments of the present invention, the opening and closing drive mechanism 44 includes a linear drive device 441, a plurality of connecting rods 442, a plurality of triangular rotating disks 443, and a plurality of fixed posts 444. The number of connecting rods 442, triangular rotating disks 443, and fixed posts 444 are all the same as the number of premixing cylinders 21. The fixed posts 444 are fixedly installed on the rear side wall of the combustion-supporting air duct. The connecting rods 442 and triangular rotating disks 443 are sequentially and spaced apart to form a polygonal linkage ring. The first corner of the triangular rotating disk 443 4 431 is hinged to the fixed column 444; the second corner 4432 of the triangular rotating disk is hinged to the first end 4421 of a connecting rod 442; the third triangular part 4433 of the triangular rotating disk is hinged to the second end 4422 of another connecting rod 442; the other end of each link mechanism 428 is hinged to the middle position of a connecting rod 442; the end of the telescopic rod of the linear drive device 441 is hinged to one of the connecting rods 442; and the base of the linear drive device 441 is hinged to the wall of the combustion air duct. The specific structural form of the linear drive device 441 is not limited and can be selected from existing technologies, such as preferably using a cylinder. The beneficial effect of adopting the above technical solution is that the ring linkage structure composed of the linear drive device, the triangular rotating disk, and the connecting rod effectively avoids the intermediate fuel pipeline, and the entire polygonal linkage ring can be driven to move synchronously by a single drive source, thereby driving all the wind deflector units to open and close synchronously, greatly simplifying the drive structure. The integrated linkage structure is stable and has strong wind load resistance, which can adapt to the complex wind field environment inside the burner.

[0040] like Figure 6 As shown, in some other embodiments of the present invention, the first baffle plate 421 and the second baffle plate 422 are provided with a semi-circular notch 4212 at the joint when they are closed to avoid the premixed fuel distribution pipe. The beneficial effect of adopting the above technical solution is that by setting the semi-circular notch, the premixed fuel distribution pipe can be accurately avoided, and the hard interference or squeezing between the baffle plate and the pipeline can be avoided when the baffle plate is closed.

[0041] In other embodiments of the present invention, the connecting line of the first wind deflector 421 and the second wind deflector 422 in their closed state points radially perpendicularly to the axis of the central cylinder. The beneficial effect of adopting the above technical solution is that the arrangement of the connecting line pointing radially to the axis of the central cylinder makes the force-bearing structure of the two wind deflectors symmetrical, optimizing the synchronous movement effect of the two plates.

[0042] In other embodiments of the present invention, the fixed column 444 is arranged parallel to the burner axis, the triangular rotating disk 443 is arranged perpendicular to the fixed column 444, and the contour formed by the multiple connecting rods 442 is located outside the contour formed by the multiple fixed columns 444. The beneficial effects of adopting the above technical solution are: the layout of the connecting rods being externally positioned can effectively avoid the internal air duct of the combustion air duct, avoid the linkage structure from blocking or interfering with the combustion air flow, and ensure smooth air duct and stable air intake.

[0043] In some other embodiments of the present invention, the first arc-shaped crank 425 and the second arc-shaped crank 426 on the same windshield unit are arranged symmetrically to each other.

[0044] In other embodiments of the present invention, the length of the chain rod mechanism 428 is adjustable, and it is locked by a locking sleeve after being adjusted to a preset length. The beneficial effects of adopting the above technical solution are: the chain rod length can be precisely and finely adjusted according to the actual assembly conditions, the opening and closing stroke and the closing fit of the wind deflector can be adjusted, ensuring that all wind deflector units can be completely sealed after closing and the flow area is maximized after opening.

[0045] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A high-adjustment-ratio, low-NOx burner, characterized in that, include: A central combustion unit is located at the center of the gasifier. The central combustion unit includes a central cylinder, a central fuel supply pipe, and an ignition gun. The central fuel supply pipe and the ignition gun axially penetrate the inner cavity of the central cylinder. Multiple premixed combustion units, each premixed combustion unit includes a premixing cylinder and a premixed fuel distribution pipe, the front end of each premixed fuel distribution pipe extends into the inner cavity of the corresponding premixing cylinder, and the multiple premixing cylinders are distributed in a circumferential array around the central cylinder. A combustion air supply unit includes a combustion air duct that surrounds the rear of a central cylinder and a premixing cylinder. Combustion-supporting wind deflector mechanism, which is used to control the opening and closing of the rear ports of each premixing cylinder; When the burner is in the first power mode, both the central fuel supply pipe and the premixed fuel distribution pipe supply fuel. The combustion air baffle mechanism controls the opening of the rear ports of each premixing cylinder. Part of the combustion air enters the inner cavity of the premixing cylinder from the rear port of the combustion air duct, and another part of the combustion air enters the inner cavity of the central cylinder from the hole at the rear of the central cylinder. When the burner is in the second power mode, the premixed fuel distribution pipe stops supplying fuel, and only the central fuel supply pipe supplies fuel. The combustion air baffle mechanism controls the rear port of each premixed cylinder to close to prevent the combustion air from entering the inner cavity of the premixed cylinder. The combustion air from the combustion air duct enters the inner cavity of the central cylinder from the hole in the rear part of the central cylinder.

2. The high-adjustment-ratio low-NOx burner according to claim 1, characterized in that, The combustion-supporting wind deflector mechanism includes an opening and closing drive mechanism and multiple wind deflector units. The number of wind deflector units is the same as the number of premixing cylinders. One wind deflector unit is set between the rear ports of adjacent premixing cylinders. The opening and closing drive mechanism is used to drive multiple wind deflector units to open or close synchronously.

3. The high-adjustment-ratio low-NOx burner according to claim 2, characterized in that, Each wind deflector unit includes a first wind deflector and a second wind deflector, both of which are pivotally mounted at the rear port of the premixing cylinder. When the wind deflector unit is in the closed state, the first wind deflector and the second wind deflector are on the same plane and cover the rear port of the premixing cylinder. When the wind deflector unit is in the open state, the first wind deflector and the second wind deflector pivotally flip back.

4. The high-adjustment-ratio low-NOx burner according to claim 3, characterized in that, Each windbreak unit further includes a first fixed plate, a second fixed plate, a first arc-shaped crank, a second arc-shaped crank, a balance support plate, and a chain rod mechanism. The first fixed plate and the second fixed plate are fixedly installed on the combustion air duct wall at the rear port of the premixing cylinder. The first windbreak plate and the second windbreak plate are both pivotally connected between the first fixed plate and the second fixed plate. The first windbreak plate and the second windbreak plate are each provided with connecting ears offset from their respective pivot axes. One end of the first arc-shaped crank is hinged to the connecting ear of the first windbreak plate, and the other end of the first arc-shaped crank is hinged to one end of the balance support plate. One end of the second arc-shaped crank is hinged to the connecting ear of the second windbreak plate, and the other end of the second arc-shaped crank is hinged to the other end of the balance support plate. One end of the chain rod mechanism is hinged to the middle position of the balance support plate.

5. The high-adjustment-ratio low-NOx burner according to claim 4, characterized in that, The opening and closing drive mechanism includes a linear drive device, multiple connecting rods, multiple triangular rotating disks, and multiple fixed columns. The number of connecting rods, triangular rotating disks, and fixed columns is the same as the number of premixing cylinders. The fixed columns are fixedly installed on the rear wall of the combustion-supporting air duct. The connecting rods and triangular rotating disks are sequentially and spaced apart to form a polygonal linkage ring. The first corner of the triangular rotating disk is hinged to the fixed column, the second corner of the triangular rotating disk is hinged to the first end of one connecting rod, and the third triangular part of the triangular rotating disk is hinged to the second end of another connecting rod. The other end of each link mechanism is hinged to one connecting rod. The telescopic rod end of the linear drive device is hinged to one of the connecting rods. The base of the linear drive device is hinged to the wall of the combustion-supporting air duct.

6. The high-adjustment-ratio low-NOx burner according to claim 5, characterized in that, The first and second wind deflectors have a semi-circular notch at their joint when closed to avoid the premixed fuel distribution pipe.

7. The high-adjustment-ratio low-NOx burner according to claim 5, characterized in that, The connection line between the first and second wind deflectors in their closed state points radially toward the axis of the central cylinder.

8. The high-adjustment-ratio low-NOx burner according to claim 5, characterized in that, The fixed column is parallel to the burner axis, the triangular rotating disk is perpendicular to the fixed column, and the contour formed by the multiple connecting rods is located outside the contour formed by the multiple fixed columns.

9. The high-adjustment-ratio low-NOx burner according to claim 5, characterized in that, The first and second arc-shaped cranks on the same windshield unit are arranged symmetrically on an axis.

10. The high-adjustment-ratio low-NOx burner according to claim 5, characterized in that, The length of the chain mechanism is adjustable, and it is locked by a locking sleeve after being adjusted to a preset length.

Images