Precise secondary air supply device for boiler

Abstract

The invention relates to the technical field of boiler air supply equipment, in particular to a boiler secondary air precise air supply device which comprises a hollow fixing frame with the two ends open. One end of the air outlet guide cover is rotationally connected with the fixing frame, two air leakage openings are formed between the air outlet guide cover and the fixing frame after the air outlet guide cover rotates, and the rotating axis of the air outlet guide cover is located between the two air leakage openings; the two shielding plates slide relative to the outer side wall of the fixing frame, and the two shielding plates are arranged close to the two air leakage openings correspondingly so as to achieve blocking of the air leakage openings; the air supply angle of secondary air can be changed through rotation of the air outlet guide cover, so that air quantity organization form adjustment of a main combustion area in the combustion chamber is achieved, an air leakage opening formed when the air outlet guide cover rotates can be blocked through a baffle plate, the air leakage amount of the secondary air is reduced while precise air supply of the secondary air is achieved, and the service life of the secondary air is prolonged. Therefore, the effect of accurately controlling the coal ash combustion condition in the combustion chamber is achieved.

Description

Technical Field

[0001] This application relates to the field of boiler air supply equipment technology, and in particular to a boiler secondary air precision air supply device. Background Technology

[0002] Secondary air in a boiler is a crucial part of the combustion system. It refers to the air supplied to the furnace from above the grate or through specific nozzles after the initial combustion of fuel. Its core mission is to ensure complete combustion of fuel, improve efficiency, and reduce pollutant emissions. Conventional secondary air outlets are fixed and can only deliver air to specific locations within the combustion chamber at a fixed angle. This results in different combustion patterns of coal ash in specific locations compared to other areas. To further ensure precise delivery of secondary air to different locations within the combustion chamber, or to adjust the existing airflow pattern through secondary air, the secondary air outlet is usually designed to be swingable. In ordinary secondary air systems, the baffle plate is flush with the tail of the secondary air nozzle. When the secondary air outlet is horizontal and does not swing, it can effectively prevent air leakage. However, when the swing angle of the secondary air outlet is large, the air leakage will increase dramatically, severely affecting the airflow organization in the main combustion zone of the combustion chamber, and consequently affecting the combustion of coal ash in the boiler. Summary of the Invention

[0003] In order to reduce air leakage while achieving precise secondary air supply, this application provides a boiler secondary air precision supply device.

[0004] The boiler secondary air precision air supply device provided in this application adopts the following technical solution: A boiler secondary air precision air supply device includes: A fixed frame with a hollow structure and openings at both ends; An air outlet guide hood is provided, one end of which is rotatably connected to the fixed frame, and after the air outlet guide hood rotates, an air leakage port is formed between the air outlet guide hood and the fixed frame. There are two air leakage ports, and the rotation axis of the air outlet guide hood is located between the two air leakage ports. Two baffles are provided, which slide relative to the outer wall of the fixed frame, and the two baffles are respectively positioned close to the two air leaks to block the air leaks.

[0005] By adopting the above technical solution, external gas is drawn in by an air supply device such as a blower, preheated, and then sent into the inner cavity of the fixed frame. It then enters the inner cavity of the air outlet guide hood and is sent into the combustion chamber through the air outlet of the air outlet guide hood, replenishing the gas volume in the combustion chamber. Simultaneously, when it is necessary to adjust the angle of the air outlet guide hood to change the secondary air inlet angle, force is applied to the air outlet guide hood to rotate it. Then, force is applied to the baffle plate, which slides relative to the fixed frame and blocks the air leakage port formed after the air outlet guide hood rotates, thus preventing secondary air from leaking out through the air leakage port. The designed boiler secondary air precision air supply device uses the fixed frame as a secondary air delivery channel, the air outlet guide hood to deliver secondary air into the combustion chamber, and the rotation of the air outlet guide hood to change the secondary air inlet angle, thereby adjusting the air volume organization pattern of the main combustion zone in the combustion chamber. The baffle plate can block the air leakage port formed when the air outlet guide hood rotates, achieving precise secondary air supply while reducing secondary air leakage, thus achieving precise control of the coal ash combustion in the combustion chamber.

[0006] In one specific implementation scheme, the bottom plate of the air outlet guide hood is provided with a plurality of air passage holes, and the air passage holes are located on the side of the rotation axis of the air outlet guide hood close to the fixed frame.

[0007] By adopting the above technical solution, external gas is drawn in by an air supply device such as a blower, preheated, and then sent into the inner cavity of the fixed frame. It then enters the inner cavity of the air outlet guide hood and is sent into the combustion chamber through the air outlet of the air outlet guide hood to replenish the gas volume in the combustion chamber. Simultaneously, when it is necessary to adjust the angle of the air outlet guide hood to change the secondary air inlet angle, force is applied to the air outlet guide hood to rotate. At this time, the bottom plate of the air outlet guide hood penetrates into the inner cavity of the fixed frame, and the air passage hole rotates with the bottom plate of the air outlet guide hood. At this time, part of the secondary air in the fixed frame passes through the air passage hole. The airflow enters the inner cavity of the air outlet guide hood, and then force is applied to the baffle plate. At this time, the baffle plate slides relative to the fixed frame and blocks the air leakage port formed after the air outlet guide hood rotates, thereby preventing secondary air from leaking out through the air leakage port. The designed air passage hole can facilitate the entry of secondary air into the air outlet guide hood through the air passage hole when the air outlet guide hood rotates downward and the bottom plate extends into the inner cavity of the fixed frame. At the same time, it can also reduce the thrust exerted on the air outlet guide hood by the secondary air flow, ensure the stability of the tilt angle of the air outlet guide hood, and extend the service life of the air outlet guide hood rotation control unit.

[0008] In one specific implementation scheme, the air passage is inclinedly opened on the bottom plate of the air outlet guide hood, and when the air outlet guide hood is set horizontally, the angle between the air passage and the gas flow direction in the fixed frame is an acute angle.

[0009] By adopting the above technical solution, the inclined air passage hole can reduce the possibility of secondary air leaking out through the air passage hole when the air outlet guide cover is set horizontally, and can facilitate the smooth passage of secondary air through the air passage hole after rotation.

[0010] In one specific implementation scheme, a hole-blocking step is rotatably connected to the lower baffle plate. When the air outlet guide hood is horizontally set, the hole-blocking step can fit against the bottom plate of the air outlet guide hood to block the air passage.

[0011] By adopting the above technical solution, the designed hole-blocking step can block the lower opening of the air passage, thereby reducing the possibility of secondary air leaking out through the air passage.

[0012] In one specific implementation scheme, two control guide plates are rotatably connected inside the fixed frame. The rotation axis of the control guide plates is parallel to the rotation axis of the air outlet guide hood, and the rotation of the two control guide plates can reduce the acute angle between the gas inside the fixed frame and the air outlet guide hood.

[0013] By adopting the above technical solution, external gas is drawn in by an air supply device such as a blower, preheated, and then sent into the inner cavity of the fixed frame. It then enters the inner cavity of the air outlet guide hood and is sent into the combustion chamber through the air outlet of the air outlet guide hood to replenish the gas volume in the combustion chamber. Simultaneously, when it is necessary to adjust the angle of the air outlet guide hood to change the secondary air inlet angle, force is applied to the air outlet guide hood to rotate it. At this time, the bottom plate of the air outlet guide hood penetrates into the inner cavity of the fixed frame, and the air passage hole rotates with the bottom plate of the air outlet guide hood. At this time, part of the secondary air in the fixed frame enters the inner cavity of the air outlet guide hood through the air passage hole. Simultaneously, the angle of the control guide plate is adjusted, thereby using two control guide plates to circulate the secondary air within the fixed frame... The airflow attitude is adjusted in advance so that the secondary air inside the fixed frame can enter the air outlet guide hood at a small angle and then exert force on the baffle plate. At this time, the baffle plate slides relative to the fixed frame and blocks the air leakage port formed after the air outlet guide hood rotates, thereby preventing the secondary air from leaking out through the air leakage port. The designed control guide plate can adjust the flow path of the secondary air in advance within the fixed frame by adjusting the angle of the two control guide plates when the air outlet guide hood rotates, so that the secondary air enters the air outlet guide hood at a relatively parallel angle. This not only makes it easier to control the flow trajectory of the secondary air in the air outlet guide hood, but also effectively reduces the force exerted by the secondary air in the fixed frame on the air outlet guide hood.

[0014] In one specific implementation, at least one linkage rod is integrally connected to the control guide plate. The linkage rod is rotatable relative to the fixed frame, extends to the outside of the fixed frame, and the shield plate has a through groove for the linkage rod to extend into.

[0015] By adopting the above technical solution, the designed linkage rod can simultaneously control the rotation of the air guide plate while the baffle slides to block the air leakage port, thereby achieving synchronous adjustment of the rotation angle of the air outlet guide shroud and the control air guide plate.

[0016] In one specific implementation, a sliding body is formed on the shield, a slot is provided on the sliding body, and the sliding body is capable of moving up and down relative to the shield in a vertical direction.

[0017] By adopting the above technical solution, a sliding body that can slide vertically relative to the baffle can be designed. This can change the corresponding ratio between the rotation angle of the control guide plate when the baffle slides, thereby facilitating the solution of the problem of improper ratio between the sliding distance of the baffle and the rotation angle of the control guide plate caused by factors such as component size processing or assembly errors.

[0018] In one specific implementation, multiple guide plates are connected inside the air outlet guide hood, the multiple guide plates form multiple guide channels, and the guide plates are arranged close to the air outlet of the air outlet guide hood.

[0019] By adopting the above technical solution, the designed guide plate can facilitate the flow direction control of secondary air inside the air outlet guide hood.

[0020] In one specific implementation, the air outlet guide hood has an inner flow channel size that gradually decreases from the side closer to the fixed frame to the side farther away from the fixed frame.

[0021] By adopting the above technical solution, the air outlet guide hood with gradually decreasing internal flow channel size can facilitate the effective concentration of secondary air.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The designed boiler secondary air precision air supply device uses a fixed frame as a secondary air delivery channel and an air outlet guide hood to deliver secondary air into the combustion chamber. The rotation of the air outlet guide hood can change the angle of secondary air delivery, thereby adjusting the air volume organization pattern of the main combustion zone in the combustion chamber. The baffle plate can block the air leakage caused by the rotation of the air outlet guide hood, thereby reducing the leakage of secondary air while achieving precise secondary air supply, thus achieving precise control of the coal ash combustion in the combustion chamber.

[0023] 2. The designed boiler secondary air precision air delivery device can facilitate the entry of secondary air into the outlet air guide hood through the air passage when the outlet air guide hood rotates downward and the bottom plate extends into the inner cavity of the fixed frame. At the same time, it can also reduce the thrust exerted on the outlet air guide hood by the secondary air flow, ensure the stability of the tilt angle of the outlet air guide hood, and extend the service life of the outlet air guide hood rotation control unit.

[0024] 3. The designed boiler secondary air precision air supply device can adjust the flow path of the secondary air in advance within the fixed frame by adjusting the angle of the two control guide plates after the air outlet guide hood rotates. This allows the secondary air to enter the air outlet guide hood at a relatively parallel angle, which not only facilitates the control of the flow trajectory of the secondary air in the air outlet guide hood, but also effectively reduces the force exerted by the secondary air in the fixed frame on the air outlet guide hood.

[0025] 4. The designed boiler secondary air precision air supply device has a sliding body that can slide vertically relative to the baffle plate. It can change the corresponding ratio between the rotation angle of the control guide plate when the baffle plate slides, thereby facilitating the solution of the problem of improper ratio between the sliding distance of the baffle plate and the rotation angle of the control guide plate caused by factors such as component size processing or assembly errors. Attached Figure Description

[0026] Figure 1 This is a front view of the boiler secondary air precision air supply device according to an embodiment of this application.

[0027] Figure 2 This is a top view after cross-section of the boiler secondary air precision air supply device according to an embodiment of this application.

[0028] Figure 3 yes Figure 1 A schematic diagram showing the state after the air outlet guide cover is rotated downwards by 30 degrees and a baffle is added.

[0029] Figure 4 Is Figure 3 A schematic diagram of a structure with air passage holes opened on the bottom plate of the air outlet guide cover.

[0030] Figure 5 Is Figure 4 A schematic diagram of the structure after adding the hole-blocking step body to the basic structure.

[0031] Figure 6 Is Figure 5 A schematic diagram of the structure after adding a control guide plate to the original structure.

[0032] Figure 7 Is Figure 6 A schematic diagram of the structure after further adding linkage rods and sliding bodies.

[0033] Explanation of reference numerals in the attached drawings: 1. Fixed frame; 2. Air outlet guide cover; 21. Air passage hole; 3. Air leak; 4. Baffle plate; 5. Baffle step body; 6. Control guide plate; 7. Linkage rod; 8. Sliding body; 9. Guide plate. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0035] This application discloses a boiler secondary air precision air supply device.

[0036] Reference Figure 1 and Figure 2 A boiler secondary air precision air supply device includes a fixed frame 1 and an air outlet guide hood 2. The fixed frame 1 is hollow and has openings at both ends. The air inlet of the fixed frame 1 is connected to an external air supply device such as a blower. In order to reduce the temperature difference between the secondary air and the gas in the combustion chamber, a preheating structure such as an electric heating wire or a heating rod can be installed inside the fixed frame 1. One end of the air outlet guide hood 2 is rotatably connected to the fixed frame 1 through a rotating shaft, and the rotation axis of the air outlet guide hood 2 is horizontal. By rotating the air outlet guide hood 2, secondary air can be supplied into the combustion chamber at different angles, thereby providing uniform combustion of coal ash in various areas of the combustion chamber and realizing the adjustment of the air volume organization pattern in the main combustion zone of the combustion chamber.

[0037] Reference Figure 2 In some embodiments of this application, multiple guide plates 9 are welded and fixed inside the air outlet guide hood 2. The multiple guide plates 9 form multiple guide channels, and the guide plates 9 are set close to the air outlet of the air outlet guide hood 2. Through the guide plates 9, it is convenient to control the flow direction of the secondary air inside the air outlet guide hood 2. The size of the inner flow channel of the air outlet guide hood 2 gradually decreases from the side close to the fixed frame 1 to the side away from the fixed frame 1. Through the air outlet guide hood 2 with the gradually decreasing inner flow channel size, it is convenient to achieve effective gathering of secondary air.

[0038] Reference Figure 3 and Figure 4After the air outlet guide hood 2 rotates, it forms an air leakage port 3 at the end of the fixed frame 1 away from the air supply equipment. There are two air leakage ports 3, distributed along the height direction, and the rotation axis of the air outlet guide hood 2 is located between the two air leakage ports 3. Furthermore, due to the presence of the air leakage ports 3, some secondary air will leak out through them, causing a difference between the actual air volume delivered into the combustion chamber by the air supply equipment and the initial metering value. To reduce air leakage, the boiler secondary air precision air supply device also includes two baffle plates 4. The baffle plates 4 are connected to the outer edge of the fixed frame 1. The side walls slide relative to each other, and the two baffles 4 are respectively set close to the two air leaks 3. After the baffles 4 slide, they can abut against the top or bottom plate of the air outlet guide hood 2, thereby sealing the air leaks 3. In this application, the sliding of the baffles 4 can be achieved by an electric telescopic rod, a hydraulic cylinder, or other structures. The baffles 4 can seal the air leaks 3 formed when the air outlet guide hood 2 rotates, thereby achieving precise secondary air delivery and reducing the leakage of secondary air, thus achieving precise control of the coal ash combustion in the combustion chamber.

[0039] Reference Figure 4 Furthermore, when the air outlet guide hood 2 rotates from a horizontal position to a downward tilt, the bottom plate of the air outlet guide hood 2 will intrude into the fixed frame 1, thereby obstructing the entry of secondary air from the fixed frame 1 into the air outlet guide hood 2. Therefore, multiple air passage holes 21 are provided on the bottom plate of the air outlet guide hood 2. The air passage holes 21 are located on the side of the rotation axis of the air outlet guide hood 2 close to the fixed frame 1. That is, when the air outlet guide hood 2 rotates downward, the bottom plate of the air outlet guide hood 2 with air passage holes 21 extends into the inner cavity of the fixed frame 1. This allows secondary air to enter the air outlet guide hood 2 through the air passage holes 21 when the air outlet guide hood 2 rotates downward and the bottom plate extends into the inner cavity of the fixed frame 1. At the same time, it can also reduce the thrust exerted on the air outlet guide hood 2 by the secondary air flow, ensure the stability of the tilt angle of the air outlet guide hood 2, and extend the service life of the rotation control unit of the air outlet guide hood 2.

[0040] Reference Figure 4 Specifically, the air passage 21 is inclinedly opened on the bottom plate of the air outlet guide hood 2, and when the air outlet guide hood 2 is set horizontally, the angle between the air passage 21 and the horizontal line where the gas flow direction is located in the fixed frame 1 is an acute angle; by the inclined air passage 21, the possibility of secondary air leaking out through the air passage 21 can be reduced when the air outlet guide hood 2 is set horizontally, and secondary air can pass through the air passage 21 more smoothly after rotation.

[0041] Reference Figure 5Furthermore, a diaphragm step 5 is rotatably connected to the lower baffle plate 4. The rotation axis of the diaphragm step 5 is consistent with the rotation axis of the air outlet guide hood 2. When the air outlet guide hood 2 is set horizontally, the diaphragm step 5 can fit against the bottom plate of the air outlet guide hood 2 to block the air passage 21, thereby reducing the possibility of secondary air leaking out through the air passage 21.

[0042] Reference Figure 6 Furthermore, two control guide plates 6 are rotatably connected inside the fixed frame 1. The rotation axis of the control guide plates 6 is parallel to the rotation axis of the air outlet guide hood 2. After the two control guide plates 6 rotate, the acute angle between the secondary air in the fixed frame 1 and the air outlet guide hood 2 is reduced, which means that the secondary air in the fixed frame 1 can enter the air outlet guide hood 2 at a smaller angle. Through the control guide plates 6, the flow path of the secondary air can be adjusted in advance in the fixed frame 1 by adjusting the angle of the two control guide plates 6 when the air outlet guide hood 2 rotates, so that the secondary air enters the air outlet guide hood 2 at a relatively parallel angle. This not only makes it easier to control the flow trajectory of the secondary air in the air outlet guide hood 2, but also effectively reduces the force exerted by the secondary air in the fixed frame 1 on the air outlet guide hood 2.

[0043] Reference Figure 7 Specifically, to facilitate the linkage control of the attitude of the baffle plate 4 and the control guide plate 6, at least one linkage rod 7 is integrally connected to the control guide plate 6. The linkage rod 7 can rotate relative to the fixed frame 1 and extends to the outside of the fixed frame 1. The baffle plate 4 has through slots for the linkage rod 7 to enter. The number of through slots is the same as the number of linkage rods 7 connected to the control guide plate 6. Through the linkage rod 7, the control guide plate 6 can be rotated while the baffle plate 4 slides to block the air vent 3, thereby realizing the synchronous adjustment of the rotation angle of the air outlet guide hood 2 and the control guide plate 6.

[0044] Reference Figure 7 Furthermore, a sliding body 8 is formed on the baffle plate 4, and a slot is provided on the sliding body 8. The sliding body 8 can move up and down relative to the baffle plate 4 in the vertical direction. That is, the sliding body 8 can change the distance between itself and the rotation axis of the linkage rod 7, thereby changing the proportional relationship between the sliding distance of the baffle plate 4 and the rotation angle of the linkage rod 7. In this application, the raising and lowering of the sliding body 8 can be achieved by adjusting bolts, hydraulic cylinders, electric telescopic rods, or other structures. By using the sliding body 8, which can slide relative to the baffle plate 4 in the vertical direction, the corresponding ratio between the rotation angle of the control guide plate 6 when the baffle plate 4 slides can be changed. This helps to solve the problem of improper corresponding ratio between the sliding distance of the baffle plate 4 and the rotation angle of the control guide plate 6 caused by factors such as component size processing or assembly errors.

[0045] The implementation principle of a boiler secondary air precision air supply device in this application embodiment is as follows: external gas is drawn in by an air supply device such as a blower, preheated, and then sent into the inner cavity of the fixed frame 1. Subsequently, it enters the inner cavity of the air outlet guide hood 2 and is sent into the combustion chamber through the air outlet of the air outlet guide hood 2 to replenish the gas volume in the combustion chamber.

[0046] When it is necessary to adjust the angle of the air outlet guide hood 2 to change the secondary air entry angle, force is applied to the air outlet guide hood 2 to make it rotate. When the air outlet guide hood 2 rotates downward and the bottom plate extends into the inner cavity of the fixed frame 1, it is convenient for the secondary air to enter the air outlet guide hood 2 through the air passage 21. At the same time, it can also reduce the thrust exerted on the air outlet guide hood 2 by the secondary air flow, ensure the stability of the tilt angle of the air outlet guide hood 2, and extend the service life of the air outlet guide hood 2 rotation control unit.

[0047] When the air outlet guide hood 2 rotates, the angle of the two control guide plates 6 is adjusted in advance to adjust the flow path of the secondary air within the fixed frame 1, so that the secondary air enters the air outlet guide hood 2 at a relatively parallel angle. This not only makes it easier to control the flow trajectory of the secondary air within the air outlet guide hood 2, but also effectively reduces the force exerted by the secondary air within the fixed frame 1 on the air outlet guide hood 2.

[0048] Then, force is applied to the baffle plate 4. At this time, the baffle plate 4 slides relative to the fixed frame 1 and blocks the air leakage port 3 formed after the air outlet guide hood 2 is rotated, thereby preventing secondary air from leaking out through the air leakage port 3. The fixed frame 1 can be used as a secondary air delivery channel, and the air outlet guide hood 2 can deliver secondary air into the combustion chamber. The rotation of the air outlet guide hood 2 can change the angle of secondary air delivery, thereby adjusting the air volume organization pattern of the main combustion zone in the combustion chamber. The baffle plate 4 can block the air leakage port 3 formed when the air outlet guide hood 2 is rotated, thereby achieving precise secondary air delivery and reducing the leakage of secondary air, thus achieving precise control of the coal ash combustion in the combustion chamber.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A boiler secondary air precision air supply device, characterized in that: include: A hollow fixed frame with openings at both ends (1); An air outlet guide hood (2) is rotatably connected to the fixed frame (1) at one end, and an air leakage port (3) is formed between the air outlet guide hood (2) and the fixed frame (1) after rotation. There are two air leakage ports (3), and the rotation axis of the air outlet guide hood (2) is located between the two air leakage ports (3). Two baffles (4) slide relative to the outer wall of the fixed frame (1), and the two baffles (4) are respectively set close to the two air leaks (3) to achieve the sealing of the air leaks (3).

2. The boiler secondary air precision air supply device according to claim 1, characterized in that: The bottom plate of the air outlet guide cover (2) is provided with a plurality of air passage holes (21), and the air passage holes (21) are located on the side of the rotation axis of the air outlet guide cover (2) close to the fixed frame (1).

3. The boiler secondary air precision air supply device according to claim 2, characterized in that: The air passage (21) is inclinedly opened on the bottom plate of the air outlet guide cover (2), and when the air outlet guide cover (2) is set horizontally, the angle between the air passage (21) and the gas flow direction in the fixed frame (1) is an acute angle.

4. The boiler secondary air precision air supply device according to any one of claims 2 or 3, characterized in that: A hole-blocking step body (5) is rotatably connected to the lower baffle plate (4). When the air outlet guide hood (2) is set horizontally, the hole-blocking step body (5) can fit against the bottom plate of the air outlet guide hood (2) to block the air passage hole (21).

5. The boiler secondary air precision air supply device according to claim 1, characterized in that: Two control guide plates (6) are rotatably connected inside the fixed frame (1). The rotation axis of the control guide plate (6) is parallel to the rotation axis of the air outlet guide hood (2). After the two control guide plates (6) rotate, the acute angle between the gas in the fixed frame (1) and the air outlet guide hood (2) can be reduced.

6. The boiler secondary air precision air supply device according to claim 5, characterized in that: At least one linkage rod (7) is integrally connected to the control guide plate (6). The linkage rod (7) can rotate relative to the fixed frame (1). The linkage rod (7) extends to the outside of the fixed frame (1), and the shield plate (4) has a through groove for the linkage rod (7) to extend into.

7. The boiler secondary air precision air supply device according to claim 6, characterized in that: A sliding body (8) is formed on the shield (4), and a slot is provided on the sliding body (8), and the sliding body (8) can move up and down relative to the shield (4) in the vertical direction.

8. The boiler secondary air precision air supply device according to claim 1, characterized in that: The air outlet guide cover (2) is connected to multiple guide plates (9), which form multiple guide channels, and the guide plates (9) are located close to the air outlet of the air outlet guide cover (2).

9. The boiler secondary air precision air supply device according to claim 1, characterized in that: The air outlet guide hood (2) has a gradually decreasing inner flow channel size from the side closer to the fixed frame (1) to the side farther away from the fixed frame (1).

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