Adjustable coal dust distributor

Abstract

The utility model relates to the field of coal powder distribution adjusting equipment of coal power plant, specifically is a kind of adjustable coal powder distributor. Including distribution cylinder, the distribution cylinder has distribution cavity in, the distribution cylinder upper end is equipped with multiple powder outlet pipe, the lower end of the powder outlet pipe is equipped with rotatable pipe;The lower end of the rotatable pipe is equipped with bevelled cutout;Rotatable pipe is connected with rotation control device, and the rotation of rotatable pipe is controlled by rotation control device.Controlled rotatable pipe rotates. Rotatable bevelled cut steel pipe structure, rotatable steel pipe is installed in the lower part of each powder outlet pipe, and the end thereof forms 15 °-45 ° adjustable angle with vertical direction. Bevelled cutout is opened in the outer wall of steel pipe, and the area of windward surface is changed by rotating. Dynamic adjustment mechanism: drive device drives steel pipe to rotate→change bevelled cutout exposure area→real-time adjustment each branch pipe wind powder flow.

Description

Technical Field

[0001] This utility model relates to the field of coal powder distribution and regulation equipment for coal-fired power plants, specifically an adjustable coal powder distributor. Background Technology

[0002] The medium-speed coal mill distributor, also known as a pulverized coal distributor or primary air-coal distributor, is a key component connecting the coal mill outlet to the pulverized coal pipelines leading to the boiler burners. Its purpose is to ensure that the pulverized coal-air mixture (air-coal mixture) from the coal mill is evenly distributed into the pipelines leading to each burner.

[0003] Uniform pulverized coal distribution is a prerequisite for ensuring stable, efficient, and low-pollution combustion in all burners within the boiler. However, uneven distribution can lead to some burners receiving too much pulverized coal (excessive concentration), potentially resulting in incomplete combustion, producing large amounts of unburned carbon (high carbon content in fly ash), and reduced efficiency; or causing localized overheating, leading to slagging and high-temperature corrosion. Conversely, some burners receiving too little pulverized coal (excessive concentration) may experience unstable flames, be prone to flameout, have low combustion efficiency, and even require oil injection for combustion assistance. In short, uneven heat load on each burner affects the overall temperature field distribution and steam parameter control of the boiler.

[0004] Traditional pulverized coal distributors use a fixed structure, resulting in uneven air and coal flow rates in each outlet pipe, leading to a low pulverized coal uniformity index (only 1.1-1.2). This reduces boiler combustion efficiency, increases NOx emissions, and negatively impacts the economic and environmental performance of the power plant. Summary of the Invention

[0005] In order to solve some problems existing in the coal powder distributor in the prior art, this utility model provides an adjustable coal powder distributor.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an adjustable pulverized coal distributor, including a distribution cylinder, the distribution cylinder having a distribution cavity, the upper end of the distribution cylinder being provided with multiple pulverized coal outlet pipes, the lower end of the pulverized coal outlet pipes being provided with a rotatable pipe; the lower end of the rotatable pipe being provided with a beveled cut.

[0007] The rotatable tube is connected to a rotation control device, which controls the rotation of the rotatable tube.

[0008] Furthermore, the angle between the oblique cut and the horizontal plane is 10°-30°.

[0009] Furthermore, the rotation control device includes a drive unit, a first transmission shaft, a gear set, a second transmission shaft, a universal coupling, a third transmission shaft, and a support rod connected in sequence;

[0010] The gear set is installed on the upper side wall of the powder outlet pipe, and the output end of the drive device is connected to the first transmission shaft, which drives the gear set to rotate.

[0011] The universal coupling is located below the gear set, and the universal coupling and the gear set are driven by the second drive shaft.

[0012] The support rod is installed on the outer wall of the rotatable tube, and a third drive shaft is provided between the universal coupling and the support rod.

[0013] Furthermore, the angle between the oblique cut and the vertical direction is 15°-45°, and the angle between the axis of the rotatable tube and the horizontal plane is 30-60°.

[0014] Furthermore, the rotatable tube is made of stainless steel.

[0015] Furthermore, the driving device is a stepper motor or a pneumatic actuator.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: a rotatable oblique-cut steel pipe structure is provided, in which a rotatable steel pipe is installed at the bottom of each powder outlet pipe, and its end is at an adjustable angle of 15°-45° (preferably 30°) with the vertical direction. An oblique cut is made on the outer wall of the steel pipe, and the windward surface area is changed by rotation.

[0017] Dynamic adjustment mechanism: The drive device rotates the steel pipe → changes the exposed area of ​​the oblique cut → adjusts the air and powder flow rate of each branch pipe in real time.

[0018] This increases the pulverized coal uniformity index from 1.1-1.2 to 1.3-1.4; completes the flow adjustment and rebalancing of each pulverized coal tank within 3 seconds; improves boiler efficiency by 0.8%-1.2% and saves approximately 2 million yuan in coal costs annually (based on a 600MW unit). Attached Figure Description

[0019] Figure 1 A cross-sectional view of the adjustable pulverized coal distributor provided by this utility model;

[0020] Figure 2 A cross-sectional view of the adjustable pulverized coal distributor provided by this utility model;

[0021] Figure 3 A partial schematic diagram of the adjustable pulverized coal distributor provided by this utility model;

[0022] Figure 4 This is a schematic diagram of an existing pulverized coal distributor;

[0023] The components include: a dispensing cylinder 1, a dispensing chamber 2, a rotatable tube 3, a beveled opening 4, a powder outlet tube 5, a drive unit 6, a first drive shaft 7, a gear set 8, a second drive shaft 9, a universal coupling 10, a third drive shaft 11, and a support rod 12. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figures 1-3 As shown, this embodiment provides an adjustable pulverized coal distributor, including a distribution cylinder 1. The upper diameter of the distribution cylinder 1 is larger than that of the lower diameter, making its cross-section an inverted trapezoid. The distribution cylinder 1 has a distribution cavity 2. Four to six pulverized coal outlet pipes 5 are evenly distributed at the upper end of the distribution cylinder 1. The air-pulverized coal mixture rises in a spiral manner from bottom to top and enters the boiler for combustion through the pulverized coal outlet pipes 5. A rotatable tube 3 is provided at the lower end of the pulverized coal outlet pipe 5. The lower end of the rotatable tube 3 is provided with a beveled cut 4. The rotatable tube 3 is made of stainless steel and has wear resistance. The rotatable tube 3 is connected to a rotation control device. The rotation of the rotatable tube 3 is controlled by the rotation control device. By rotating the rotatable tube 3, the contact area with the air-pulverized coal mixture can be adjusted, thereby realizing the flow control of each pulverized coal outlet pipe and thus adjusting the uniformity of pulverized coal.

[0026] In another embodiment of this application, the angle between the oblique cut 4 and the horizontal plane is 10°-30°. At this angle, the air-powder flow rate is uniform, and the coal powder uniformity index can be improved to 1.3-1.4.

[0027] In another embodiment of this application, the rotation control device includes a drive device 6, a first transmission shaft 7, a gear set 8, a second transmission shaft 9, a universal coupling 10, a third transmission shaft 11, and a support rod 12 connected in sequence; the drive device 6 may be a stepper motor or a pneumatic actuator.

[0028] The gear set 8 is installed on the upper side wall of the powder outlet pipe 5. The output end of the drive device 6 is connected to the first drive shaft 7. The first drive shaft 7 meshes with the gear set 8 and drives the gear set 8 to rotate through the first drive shaft 7.

[0029] Universal coupling 10 is located directly below gear set 8, specifically at the end of powder outlet pipe 5, near the connection between powder outlet pipe 5 and rotatable pipe 3; universal coupling 10 and gear set 8 are driven by second drive shaft 9.

[0030] The support rod 12 is installed on the outer wall of the rotatable tube 3, and a third drive shaft 11 is provided between the universal coupling 10 and the support rod 12; the universal coupling 10 drives the third drive shaft 11 to rotate, thereby driving the support rod 12 to rotate, and thus realizing the rotation of the rotatable tube 3.

[0031] In another embodiment of this application, the angle between the oblique cut 4 and the vertical direction is adjustable from 15° to 45°, with the most preferred angle being 30°, and the angle between the axis of the rotatable tube 3 and the horizontal plane is 30° to 60°.

[0032] The working process of the rotation control device is as follows: the drive device 6 rotates to drive the first transmission shaft 7 to rotate, the gear set 8 causes the second transmission shaft 9 to rotate, and the universal coupling 10 causes the third transmission shaft 11 to rotate. The third transmission shaft 11 is fixedly connected to the support rod 12, and the other end of the support rod 12 is fixedly connected to the rotatable tube 3. In this way, the rotation of the drive device 6 is converted into the rotation of the rotatable tube 3, and the rotation range of the rotatable tube 3 is 0-180°.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable pulverized coal distributor, characterized in that: It includes a distribution cylinder (1), which has a distribution cavity (2) inside. The upper end of the distribution cylinder (1) is provided with a plurality of powder outlet pipes (5), and the lower end of the powder outlet pipes (5) is provided with a rotatable pipe (3); the lower end of the rotatable pipe (3) is provided with a beveled cut (4). The rotatable tube (3) is connected to a rotation control device, which controls the rotation of the rotatable tube (3).

2. The adjustable pulverized coal distributor according to claim 1, characterized in that: The angle between the oblique cut (4) and the horizontal plane is 10°-30°.

3. The adjustable pulverized coal distributor according to claim 1, characterized in that: The rotation control device includes a drive unit (6), a first transmission shaft (7), a gear set (8), a second transmission shaft (9), a universal coupling (10), a third transmission shaft (11), and a support rod (12) connected in sequence. The gear set (8) is installed on the upper side wall of the powder outlet pipe (5), and the output end of the drive device (6) is connected to the first transmission shaft (7), which drives the gear set (8) to rotate through the first transmission shaft (7). The universal coupling (10) is located below the gear set (8), and the universal coupling (10) and the gear set (8) are driven by the second drive shaft (9); One end of the support rod (12) is connected to the third drive shaft (11), and the other end is connected to the rotatable tube (3). The third drive shaft (11) is provided between the universal coupling (10) and the support rod (12).

4. The adjustable pulverized coal distributor according to claim 1, characterized in that: The angle between the oblique cut (4) and the vertical direction is 15°-45°, and the angle between the axis of the rotatable tube (3) and the horizontal plane is 30°-60°.

5. The adjustable pulverized coal distributor according to claim 1, characterized in that: The rotatable tube (3) is made of stainless steel.

6. The adjustable pulverized coal distributor according to claim 3, characterized in that: The drive device (6) is a stepper motor or a pneumatic actuator.

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