Once-through boiler nozzle swing mechanism and swing method

Abstract

The invention provides a once-through boiler nozzle swing mechanism and swing method, and belongs to the technical field of boiler combustors. The problem that in the prior art, a once-through boiler burner nozzle cannot swing independently in a limited space is solved. The device comprises a power source, a main driving rod, an inner swing mechanism and transmission assemblies, the main driving rod is connected with the power source, a plurality of transmission assemblies are evenly distributed on the main driving rod, the transmission assemblies are connected with the inner swing mechanism, the inner swing mechanism is connected with a nozzle, the transmission assemblies are connected with a control mechanism, and each transmission assembly comprises a first-stage worm, a first-stage worm gear, a second-stage worm and a second-stage worm gear. The primary worm is installed on the outer side of the main driving rod, the primary worm gear is connected with the primary worm, the primary worm gear is installed at one end of the clutch shaft, the secondary worm is installed at the other end of the clutch shaft, the secondary worm gear is connected with the secondary worm, and the secondary worm gear is connected with the inner swing mechanism through the swing shaft. The nozzle swinging device is mainly used for independent boiler nozzle swinging.

Description

Technical Field

[0001] This invention belongs to the field of boiler burner technology, and in particular relates to a DC boiler nozzle swing mechanism and swing method. Background Technology

[0002] Angled tangential DC pulverized coal burners are widely used in power plant boilers. To adjust the dynamic and temperature fields of combustion within the furnace to optimize combustion, adjust steam temperature, and reduce nitrogen oxide emissions, it is typically necessary for the nozzles on the burner to swing up and down. Traditional nozzle swing mechanisms often employ a four-bar linkage, connecting all nozzles in series and driving them synchronously with a single power source. The disadvantage of this method is that it cannot achieve independent swinging of individual nozzles, resulting in poor adjustment flexibility.

[0003] If a separate drive unit is installed on each floor to achieve independent control of each nozzle, the space around the burner is extremely limited, and a large number of air ducts, coal feeding pipes and other equipment are arranged, which will result in a complex structure, high cost and difficult installation and maintenance. Summary of the Invention

[0004] In view of this, the present invention aims to provide a DC boiler nozzle swing mechanism and swing method to solve the problem that the burner nozzle of a DC boiler cannot achieve independent swing within a limited space in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A DC boiler nozzle swing mechanism includes a power source, a main drive rod, an inner swing mechanism, and a transmission assembly. The main drive rod is connected to the power source. Multiple transmission assemblies are evenly distributed on the main drive rod. The transmission assemblies are connected to the inner swing mechanism, which is connected to the nozzle. The transmission assemblies are also connected to a control mechanism. Each transmission assembly includes a primary worm, a primary worm wheel, a secondary worm, and a secondary worm wheel. The primary worm is mounted on the outside of the main drive rod. The primary worm wheel is connected to the primary worm. The primary worm wheel is mounted on one end of a clutch shaft. The other end of the clutch shaft is equipped with a secondary worm. The secondary worm wheel is connected to the secondary worm. The secondary worm wheel is connected to the inner swing mechanism via a swing shaft.

[0006] Furthermore, the swing shaft is equipped with an angular displacement sensor to detect the swing angle of the nozzle.

[0007] Furthermore, the control mechanism includes a clutch mechanism, which is mounted on the outside of the clutch shaft and is located between the first-stage worm gear and the second-stage worm.

[0008] Furthermore, the control mechanism also includes a drive device, and the clutch mechanism is controlled to open and close via the drive device.

[0009] Furthermore, the angular displacement sensor transmits the nozzle angle information to the control system, and the control system sends an open / close command to the drive device 7.

[0010] Furthermore, the driving device is a motor or a cylinder, and the clutch mechanism is an electric clutch mechanism or a pneumatic clutch mechanism.

[0011] Furthermore, both the transmission assembly and the control mechanism are installed outside the boiler burner.

[0012] Furthermore, the power source is an electric motor or a pneumatic motor.

[0013] Furthermore, the secondary worm gear and the secondary worm have a self-locking function.

[0014] A method for swinging a direct-current boiler nozzle, employing a direct-current boiler nozzle swinging mechanism, the swinging method comprising the following steps: Step 1: Start the power source to drive the main drive rod to rotate in one direction; Step 2: Engage the clutch mechanism corresponding to the nozzle that needs to swing upward; Step 3: During the rotation of the main drive rod, the nozzle swings upward through the transmission assembly and the inner swing mechanism; Step 4: Monitor the nozzle angle in real time using an angle sensor. When the preset upward swing angle is reached, disconnect the corresponding clutch mechanism through the drive device, and lock the inner swing mechanism using the self-locking function of the secondary worm gear and the secondary worm, thereby locking the nozzle. Step 5: After all the nozzles that need to swing upwards have been adjusted, rotate the main drive rod in the opposite direction to Step 1. Step 6: Engage the clutch mechanism corresponding to the nozzle that needs to swing downwards, and repeat the above swinging and locking process until all nozzles are adjusted to the target angle.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention drives multiple evenly distributed transmission components through a main drive rod, and utilizes worm gear transmission and clutch mechanism to achieve independent swing control of each nozzle within a limited space, without the need to configure a large drive device for each nozzle separately.

[0016] 2. This invention monitors the angle in real time by using an angular displacement sensor mounted on the swing shaft, and combines this with the on / off state of the clutch mechanism to achieve precise control of the nozzle swing angle. Utilizing the self-locking function of the secondary worm gear, the nozzle angle can be reliably locked after adjustment, ensuring the stability of boiler operation.

[0017] 3. When the internal nozzle is stuck, only the clutch mechanism is worn, avoiding damage to other components in the power transmission process due to overload, thus improving the reliability of the system.

[0018] 4. The present invention arranges the transmission components and control mechanism outside the burner air box, isolating them from the high temperature and high dust environment inside the air box, while placing the relatively simple internal swing mechanism inside the air box, which not only protects the precision components, but also facilitates inspection and maintenance. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of a DC boiler nozzle swing mechanism according to the present invention; Figure 2 This is a top view of the transmission assembly described in this invention; Figure 3 This is a front view of the transmission assembly described in this invention.

[0020] In the picture: 1-Power source, 2-Main drive rod, 3-First-stage worm gear, 4-First-stage worm wheel, 5-Clutch shaft, 6-Clutch mechanism, 7-Drive device, 8-Second-stage worm gear, 9-Second-stage worm wheel, 10-Swing shaft, 11-Internal swing mechanism. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0022] Detailed Implementation Method 1: See Figure 1-3 This embodiment describes a DC boiler nozzle swing mechanism, comprising a power source 1, a main drive rod 2, an inner swing mechanism 11, and a transmission assembly. The main drive rod 2 is connected to the power source 1. Multiple transmission assemblies are evenly distributed on the main drive rod 2. The transmission assemblies are connected to the inner swing mechanism 11, which is connected to the nozzle. The transmission assemblies are also connected to a control mechanism. The transmission assembly includes a primary worm gear 3, a primary worm wheel 4, a secondary worm gear 8, and a secondary worm wheel 9. The primary worm gear 3 is installed on the outside of the main drive rod 2. The primary worm wheel 4 is connected to the primary worm gear 3. The primary worm wheel 4 is installed at one end of a clutch shaft 5. The secondary worm gear 8 is installed at the other end of the clutch shaft 5. The secondary worm wheel 9 is connected to the secondary worm gear 8. The secondary worm wheel 9 is connected to the inner swing mechanism 11 via a swing shaft 10.

[0023] In this embodiment, the power source 1 can be an electric motor or a pneumatic motor, whose output end is connected to the main drive rod 2 to drive the main drive rod 2 to rotate in both forward and reverse directions. Each transmission component controls each layer of nozzles. The transmission component includes a first-stage worm 3, a first-stage worm wheel 4, a clutch shaft 5, a second-stage worm 8, a second-stage worm wheel 9, and a swing shaft 10. The control mechanism includes a clutch mechanism 6 and a drive device 7. The first-stage worm 3 is fixedly mounted on the main drive rod 2. When the main drive rod 2 rotates, it drives all the first-stage worms 3 to rotate synchronously. The first-stage worm 3 meshes with the first-stage worm wheel 4 to achieve the first stage of deceleration. The first-stage worm wheel 4 is installed at one end of the clutch shaft 5, and a clutch is mounted on the clutch shaft 5. Mechanism 6, the clutch mechanism 6 is controlled by an independent drive device 7 to engage and disengage. The other end of the clutch shaft 5 is equipped with a secondary worm gear 8. When the clutch mechanism 6 is engaged, the power of the primary worm wheel 4 is transmitted to the secondary worm gear 8 through the clutch shaft 5. When the clutch mechanism 6 is disengaged, the power transmission is cut off, and the secondary worm gear 8 meshes with the secondary worm wheel 9 to achieve the second stage of deceleration and has a self-locking function. The secondary worm wheel 9 is fixed on the swing shaft 10. An angular displacement sensor is installed on the swing shaft 10 to detect the rotation angle of the swing shaft 10, that is, the swing angle of the nozzle. The swing shaft 10 is connected to the nozzle through the inner swing mechanism 11. The swing shaft 10 and the inner swing mechanism 11 control the up and down swing of the nozzle.

[0024] When the DC boiler nozzle swing mechanism is working, the power source 1 is first started, causing the main drive rod 2 to rotate in one direction. Then, through the control system, a command is sent to the drive device 7 corresponding to the nozzle that needs to swing upward, causing it to engage the corresponding clutch mechanism 6. During the rotation of the main drive rod 2, the nozzle swings upward through the transmission assembly and the inner swing mechanism 11. The angular displacement sensor monitors the angle of the swing shaft 10 in real time and feeds it back to the control system. When the feedback angle reaches the preset upward swing angle, the control system commands the drive device 7 to act, disengaging the clutch mechanism 6 corresponding to the nozzle, cutting off the power transmission. At the same time, due to the self-locking effect of the secondary worm 8 and the secondary worm wheel 9, the nozzle is locked at the current angle. After all the nozzles that need to swing upward have been adjusted, the control system reverses the power source 1, causing the main drive rod 2 to rotate in the opposite direction. Then, the clutch mechanism 6 corresponding to the nozzle that needs to swing downward is engaged. By repeating the above process, the nozzle can be swinged downward. Through multiple adjustments, all nozzles can be precisely swinged to the preset target angle.

[0025] Detailed Implementation Method 2: See Figure 1-3 This embodiment describes a method for swinging a DC boiler nozzle, which employs a DC boiler nozzle swinging mechanism. The swinging method includes the following steps: Step 1: Start power source 1 to drive main drive rod 2 to rotate in one direction; Step 2: Engage the clutch mechanism 6 corresponding to the nozzle that needs to swing upward; Step 3: During the rotation of the main drive rod 2, the nozzle swings upward through the transmission assembly and the inner swing mechanism 11; Step 4: The nozzle angle is monitored in real time by the angle sensor. When the preset upward swing angle is reached, the corresponding clutch mechanism 6 is disengaged by the drive device 7. The inner swing mechanism 11 is locked by the self-locking function of the secondary worm gear 9 and the secondary worm 8, thereby locking the nozzle. Step 5: After all the nozzles that need to swing upwards have been adjusted, rotate the main drive rod 2 in the opposite direction to Step 1. Step 6: Engage the clutch mechanism 6 corresponding to the nozzle that needs to swing downwards, and repeat the above swinging and locking process until all nozzles are adjusted to the target angle.

[0026] The specific embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific embodiments described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A DC boiler nozzle oscillation mechanism, characterized in that: The device includes a power source (1), a main drive rod (2), an inner swing mechanism (11), and a transmission assembly. The main drive rod (2) is connected to the power source (1). Multiple transmission assemblies are evenly distributed on the main drive rod (2). The transmission assemblies are connected to the inner swing mechanism (11). The inner swing mechanism (11) is connected to the nozzle. The transmission assemblies are connected to the control mechanism. The transmission assembly includes a first-stage worm (3), a first-stage worm wheel (4), a second-stage worm (8), and a second-stage worm wheel (9). The first-stage worm (3) is installed on the outside of the main drive rod (2). The first-stage worm wheel (4) is connected to the first-stage worm (3). The first-stage worm wheel (4) is installed at one end of the clutch shaft (5). The other end of the clutch shaft (5) is equipped with the second-stage worm (8). The second-stage worm wheel (9) is connected to the second-stage worm (8). The second-stage worm wheel (9) is connected to the inner swing mechanism (11) through a swing shaft (10).

2. The DC boiler nozzle oscillation mechanism according to claim 1, characterized in that: An angular displacement sensor for detecting the swing angle of the nozzle is provided on the swing shaft (10).

3. The DC boiler nozzle oscillation mechanism according to claim 2, characterized in that: The control mechanism includes a clutch mechanism (6), which is installed on the outside of the clutch shaft (5). The clutch mechanism (6) is located between the first-stage worm gear (4) and the second-stage worm (8).

4. The DC boiler nozzle oscillation mechanism according to claim 3, characterized in that: The control mechanism also includes a drive device (7), and the clutch mechanism (6) is controlled to open and close by the drive device (7).

5. The DC boiler nozzle oscillation mechanism according to claim 4, characterized in that: The angular displacement sensor transmits the nozzle angle information to the control system, and the control system sends an open / close command to the drive device (7).

6. The DC boiler nozzle swing mechanism according to claim 4, characterized in that: The drive device (7) is a motor or a cylinder, and the clutch mechanism (6) is an electric clutch mechanism or a pneumatic clutch mechanism.

7. The DC boiler nozzle swing mechanism according to claim 1, characterized in that: Both the transmission components and the control mechanism are installed outside the boiler burner air box.

8. The DC boiler nozzle swing mechanism according to claim 1, characterized in that: The power source (1) is an electric motor or a pneumatic motor.

9. The DC boiler nozzle oscillation mechanism according to claim 1, characterized in that: The secondary worm gear (9) and the secondary worm (8) have a self-locking function.

10. A method for oscillating the nozzle of a DC boiler, characterized in that: The oscillation method of the DC boiler nozzle oscillation mechanism as described in any one of claims 1-9 includes the following steps: Step 1: Start the power source (1) to drive the main drive rod (2) to rotate in one direction; Step 2: Engage the clutch mechanism (6) corresponding to the nozzle that needs to swing upward; Step 3: During the rotation of the main drive rod (2), the nozzle swings upward through the transmission assembly and the inner swing mechanism (11); Step 4: Monitor the nozzle angle in real time using the angle sensor. When the preset upward swing angle is reached, disconnect the corresponding clutch mechanism (6) through the drive device (7), and lock the inner swing mechanism (11) using the self-locking function of the secondary worm gear (9) and the secondary worm (8), thereby locking the nozzle. Step 5: After all the nozzles that need to swing upwards have been adjusted, rotate the main drive rod (2) in the opposite direction to step 1. Step 6: Engage the clutch mechanism (6) corresponding to the nozzle that needs to swing downwards, and repeat the above swinging and locking process until all nozzles are adjusted to the target angle.

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