A high-efficiency boiler coal powder separation device

Abstract

The application discloses a boiler coal powder efficient separation device and belongs to the technical field of crushing and recycling equipment. The device comprises a shell provided with a feeding hopper, a discharging hopper communicated with the shell, and a plurality of end cover assemblies symmetrically arranged on the two sides of the shell. The end cover assembly comprises a first end cover and a second end cover symmetrically arranged on the two sides of the shell and a roller assembly arranged between the first end cover and the second end cover. The roller assembly is used for screening the fly ash. A crushing assembly is arranged on the roller assembly and used for crushing the fly ash. A first recycling pipe is used for recycling the fly ash from the discharging hopper. A second recycling pipe is communicated with the first recycling assembly. A reversing assembly is arranged on the first recycling assembly and used for switching the loop of the first recycling assembly and the second recycling assembly. The device solves the technical problem of coal particle crushing in the process of realizing the crushing separation of the fly ash and the unburned coal particles by using the existing fly ash vibrating screen separation device and is mainly applied to the coal powder recycling and crushing.

Description

Technical Field

[0001] This invention belongs to the technical field of crushing and recycling equipment, specifically relating to a high-efficiency boiler pulverized coal separation device. Background Technology

[0002] A fluidized bed boiler is a coal-fired boiler that uses air in a wind chamber to blow the hot material layer, mainly ash particles, on a fixed grate or chain grate into a fluidized state, causing it to tumble and burn together with the coal particles. It is also known as a fluidized bed combustion boiler.

[0003] When coal is burned, the ash from the burnt coal adheres to the surface of the unburned coal, resulting in incomplete combustion of the coal before it is discharged from the combustion furnace. The fully burned fly ash needs to be recycled, and the unburned coal can be reburned. In order to save economic costs, it is necessary to separate and screen the coal ash to separate and reuse the large particles of coal ash. In the existing technology, vibrating screens are generally used for screening.

[0004] However, when using a vibrating screen, the separated coal particles need to be removed and crushed before use. During the coal combustion process, fully burned fly ash adheres to the burning coal particles, causing agglomeration. If the coal particles separated by vibration are burned, the fly ash on the coal surface makes combustion difficult when put into use. This will lead to inaccurate estimation when feeding the boiler, resulting in excessive feeding leading to excessive temperature rise, or insufficient feeding leading to insufficient temperature rise. Based on this, our company has made improvements to develop a high-efficiency boiler fly ash separation device that separates fly ash from coal particles and crushes the coal particles to replace the existing technology. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide a high-efficiency coal powder separation device for boilers, so as to solve the technical problem of coal particle crushing in the process of achieving the crushing and separation of fly ash and unburned coal particles by existing coal ash vibrating screening devices.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a high-efficiency boiler pulverized coal separation device, comprising a shell with a feed hopper and a discharge hopper communicating with the shell, characterized in that:

[0007] An end cap assembly, comprising a first end cap and a second end cap symmetrically mounted on both sides of a housing, and a roller assembly located between the first end cap and the second end cap, wherein fly ash is screened by the roller assembly;

[0008] A crushing assembly, which is installed on the drum assembly, crushes the coal ash.

[0009] The first recovery pipe is used to connect to the discharge hopper to recover fly ash.

[0010] The second recycling pipe is connected to the first recycling component;

[0011] A reversing assembly is installed on the first recycling assembly to switch the circuits of the first recycling assembly and the second recycling assembly.

[0012] Furthermore: the first end cap and the second end cap have the same structure;

[0013] The first end cap includes an inner ring and an outer ring, which are arranged in a stepped manner. A first bearing is sleeved on the inner ring and fixed to the housing. Chain teeth are arranged on the annular surface of the outer ring.

[0014] The roller assembly includes a first crushing roller and a second crushing roller arranged vertically and symmetrically. A second bearing is installed at each end of the first crushing roller and the second crushing roller. The ends of the second bearings rotate in the first end cover and the second end cover. The first crushing roller and the second crushing roller are driven to rotate by a second motor.

[0015] The first recovery pipe is equipped with a first fan to send the powder to the first dust collector, and the second recovery pipe is equipped with a second fan to send the powder to the second dust collector;

[0016] The reversing assembly includes a swinging component, which is rotatably restricted to the first recovery tube by a first pin. One end of the first pin is rotatably restricted to the wall of the first recovery tube, and the other end is fixedly connected to a first sprocket. The first sprocket is driven by a first motor, and the first sprocket and the chain teeth are driven by a chain. An expansion chamber is opened on the first recovery tube in the swinging trajectory of the swinging component.

[0017] The roller assembly includes a first screen plate and a second screen plate, which are fixed between a first end cap and a second end cap. The first screen plate and the second screen plate are arranged symmetrically above and below each other, and there is a notch at the interval between the first screen plate and the second screen plate.

[0018] Furthermore: the roller assembly also includes a third crushing roller, and the first crushing roller, the second crushing roller and the third crushing roller are arranged in a triangular shape;

[0019] The roller assembly includes a first screen plate and a second screen plate, which are fixed between a first end cover and a second end cover, and are arranged adjacent to each other, with a notch at the interval between the first screen plate and the second screen plate.

[0020] Furthermore, the reversing assembly includes a second swing member and a third swing member, the first swing member and the second swing member are arranged intersectingly along the first pin, wherein the first swing member has mesh holes on both sides, the second swing member is closed, and the first pin restricts the rotation of the second swing member and the third swing member to the first recovery tube.

[0021] Compared with the prior art, the present invention has the following advantages: by adding a drum assembly to replace the first and second recovery pipes, as well as the reversing assembly, and by using the first motor that drives the reversing assembly to drive the rotation of the drum assembly, the separation of fly ash and unburned coal ash is achieved, and the equipment can also be used to crush coal particles.

[0022] On the other hand, the cross-type reversing component also realizes secondary filtration of coal particles, and sends the secondary filtered coal particles to the second recovery pipe for recycling and then to the boiler for combustion. This avoids the mixing of coal particles in the recovered fly ash, which would cause a technical problem of reduced product quality when fly ash is reused. It has good applicability and promotion potential. Attached Figure Description

[0023] Figure 1 This is the main view of the present invention;

[0024] Figure 2 This is a structural diagram of the first end cap of the present invention;

[0025] Figure 3 This is a combined diagram of the drum assembly and crushing assembly of the present invention;

[0026] Figure 4 This is a partial structural diagram of the crushing component of the present invention;

[0027] Figure 5 This is the present invention. Figure 1 Partial sectional view at point A;

[0028] Figure 6 This is a structural diagram of the third embodiment of the present invention;

[0029] Figure 7 This is a structural diagram of the fourth embodiment of the present invention. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] In the description of the invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the first embodiment of the present invention, as Figure 1 As shown, a high-efficiency boiler pulverized coal separation device includes a shell 1 with a feed hopper 1 and a discharge hopper 3 communicating with the shell 1, characterized in that:

[0033] The end cap assembly includes a first end cap 4 and a second end cap 5 symmetrically installed on both sides of the housing 1, and a roller assembly located between the first end cap 4 and the second end cap 5, through which fly ash is screened.

[0034] A crushing assembly, which is installed on the drum assembly, crushes the coal ash.

[0035] The first recovery pipe 6 is used to connect to the discharge hopper 3 to recover fly ash.

[0036] The second recycling pipe 7 is connected to the first recycling component;

[0037] A reversing assembly is installed on the first recycling assembly to switch the circuits of the first recycling assembly and the second recycling assembly.

[0038] By adopting the above technical solution, the implementation method of the present invention is as follows:

[0039] Before coal is fed into the boiler for combustion, it needs to be crushed to improve the combustion efficiency of coal. Therefore, when this equipment is used to supply coal ash to the boiler, coal is added into the shell 1 through the feed hopper 1. At the same time, the second motor 15 drives the crushing component to crush the coal. The crushed coal powder enters the second recovery pipe 7 and is then sent to the boiler for combustion.

[0040] When this equipment is used to recover coal ash after boiler combustion, the fully burned white ash covers the unburned or incompletely burned coal particles during the combustion process, causing the incompletely burned particles to be discharged directly. Therefore, this part needs to be recycled when recovering the white ash. The first motor 35 drives the reversing assembly to feed fly ash into the first recovery pipe 6. During the reversing process, the end cover assembly screen is aligned with the feed hopper via a chain. The fly ash powder in the shell 1 passes through the screen and goes to the first recovery pipe 6 for recovery. After a period of time, the first motor 35 drives the reversing assembly to reverse, and the reversing assembly feeds material into the second recovery pipe 7. At the same time, it drives the end cover to rotate, exposing the opening in the drum assembly. The lumpy, incompletely burned coal particles enter the shell, and the second motor drives the crushing assembly to crush the coal particles. The crushed coal particles enter the second recovery pipe 7 for recovery and supply to the boiler for combustion.

[0041] In the second embodiment of the present invention, as Figures 1-5 As shown, the first end cap 4 and the second end cap 5 have the same structure.

[0042] The first end cap 4 includes an inner ring 8 and an outer ring 9. The inner ring 8 and the outer ring 9 are arranged in a stepped manner. A first bearing 10 is sleeved on the inner ring and fixed on the housing 1. Chain teeth 11 are arranged on the annular surface of the outer ring 9.

[0043] The roller assembly includes a first crushing roller 12 and a second crushing roller 13 arranged vertically. The first crushing roller 12 and the second crushing roller 13 are arranged symmetrically vertically. A second bearing 14 is installed at each end of the first crushing roller 12 and the second crushing roller 13. The end of the second bearing 14 rotates in the first end cover 4 and the second end cover 5. The first crushing roller 13 and the second crushing roller 14 are driven to rotate by a second motor 15.

[0044] The first recovery pipe 6 is equipped with a first fan 16 to send the powder to the first dust collector 17, and the second recovery pipe 7 is equipped with a second fan 18 to send the powder to the second dust collector 19.

[0045] The reversing assembly includes a swing member 20, which is rotatably restricted to the first recovery pipe 6 by a first pin 21. One end of the first pin 21 is rotatably restricted to the pipe wall of the first recovery pipe 6. A first sprocket 26 is driven by a first motor 35, and the other end is fixedly connected to the first sprocket 26. The first sprocket 26 and the chain teeth 11 are driven by a chain 27. An expansion chamber 22 is opened on the first recovery pipe 6 in the swing trajectory of the swing member 20.

[0046] The roller assembly includes a first screen plate 23 and a second screen plate 24. The first screen plate 23 and the second screen plate 24 are fixed between the first end cover 4 and the second end cover 5, and the first screen plate 23 and the second screen plate 24 are arranged symmetrically in the upper and lower parts. There is a notch 25 at the interval between the first screen plate 23 and the second screen plate 24.

[0047] By adopting the above technical solution, the implementation of this solution is as follows: the position of the drum assembly is adjusted in advance according to the application mode of this equipment. When used for fly ash recovery and unburned coal ash recovery, the drum assembly should be in the position of the screen plate, and the position of the swinging part should be in the position of conveying powder to the first recovery pipe. The screen plate corresponds to the feed hopper. The above method is that the first motor 35 drives the first sprocket 26 to rotate, thereby driving the chain 27 to rotate the first end cover 4 and the second end cover with chain teeth 11, thereby adjusting the position of the swinging part 20 and the first screen plate 23. The first sprocket 26 is a proportionally reduced version of the first end cover 4 or the second end cover 5 with chain teeth 11. The coal ash composition after boiler combustion enters the shell 1 from the feed hopper 1 and falls on the surface of the first screen plate 23. The fly ash enters the drum assembly through the mesh on the first screen plate 23 and falls into the discharge hopper 3 from both sides of its surface when it encounters the vertically arranged first crushing roller 12 or the second crushing roller 13.

[0048] During the above operation, the first fan 16 equipped with the first recovery pipe 6 is started to generate negative pressure suction in the first recovery pipe 16. As a result, the coal powder in the discharge hopper 3 is sucked by the first fan 16 through the surface of the swinging part 20 and sent to the first filter 17. Our filter adopts a bag dust collector.

[0049] After the above operation has been running for a period of time, the first motor 35 drives the first sprocket 26. During the rotation of the first sprocket 26, the chain 27 is driven, which causes the first end cap 4 and the second end cap with chain teeth 11 to rotate. This causes the swinging component 20 to swing and be conveyed into the second recovery pipe 7. At the same time, the notch 25 of the roller assembly is exposed. Before the lumpy coal particles fall into the parallel first crushing roller 12 and second crushing roller 13, the second motor 15 is started to make the first crushing roller 12 and the second crushing roller 13 rotate to crush the coal. At the same time, the second fan 18 equipped in the second recovery pipe 7 is started to create negative pressure suction in the second recovery pipe 7. The crushed coal powder enters the discharge hopper 3 and falls on the surface of the swinging component 20. It is then sucked by the second fan 18 and sent to the second filter 19. Our filter adopts a bag filter dust collector.

[0050] In the third embodiment of the present invention, as Figure 6 As shown, the roller assembly also includes a third crushing roller 28, and the first crushing roller 12, the second crushing roller 13 and the third crushing roller 28 are arranged in a triangular shape.

[0051] The roller assembly includes a first screen plate 23 and a second screen plate 24. The first screen plate 23 and the second screen plate 24 are fixed between the first end cover 4 and the second end cover 5, and the first screen plate 23 and the second screen plate 24 are arranged adjacent to each other. There is a notch 25 at the interval between the first screen plate 23 and the second screen plate 24.

[0052] By adopting the above technical solution, the implementation of this solution is as follows: Since the fixed form of the first screen plate 23 and the second screen plate 24 we use causes the fly ash falling onto the screen plate to accumulate and not fall off, we adopt the adjacent form of the first screen plate 23 and the second screen plate 24. During the sieving process, the shell drives the first screen plate 23 and the second screen plate 24 to swing at the joint of the feed inlet 3 through the reciprocating rotation of the second motor 15, thereby improving the dust removal efficiency.

[0053] Meanwhile, by adding a third crushing roller 28 and arranging the first crushing roller 12, the second crushing roller 13 and the third crushing roller 28 in a specific shape, larger coal particles can be crushed when the screen aperture is large.

[0054] In the fourth embodiment of the present invention, as Figure 7 As shown, the reversing assembly includes a second swing member 29 and a third swing member 30. The first swing member 29 and the second swing member 30 are arranged crosswise along the first pin 21. The first swing member 29 has mesh holes on both sides, and the second swing member 30 is closed. The first pin 21 restricts the rotation of the second swing member 29 and the third swing member 30 to the first recovery tube 6.

[0055] By adopting the above technical solution, the usage of this solution is as follows: Since there is a phenomenon that coal particles are not fully crushed and fall into the recovery pipe, we use a cross-shaped second swing member 29 and a third swing member 30. By arranging the second swing member 29 and the third swing member 30 crosswise, four included angles are formed between the second swing member 29 and the third swing member 30. These are divided into a first included angle, a second included angle, a third included angle, and a fourth included angle along the circumference of the first pin shaft. The first included angle and the third included angle convey powder to the first recovery pipe 6, and the second included angle and the fourth included angle convey powder to the second recovery pipe 7, thus realizing the second recovery of the powder. At the same time, the second swing member 29 can be used to perform secondary filtration of the powder. The second motor 15 can also be used to drive the first included angle, the second included angle, the third included angle, and the fourth included angle to send the filtered large coal particles into the second recovery pipe 7 and transport them to the boiler for combustion.

[0056] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A high-efficiency boiler pulverized coal separation device, comprising a shell (2) having a feed hopper (1) and a discharge hopper (3) communicating with the shell (2), characterized in that: The end cap assembly includes a first end cap (4) and a second end cap (5) symmetrically installed on both sides of the housing (2), and a roller assembly located between the first end cap (4) and the second end cap (5). The roller assembly is used to screen fly ash. The first end cap (4) and the second end cap (5) have the same structure. The first end cap (4) includes an inner ring (8) and an outer ring (9). The inner ring (8) and the outer ring (9) are arranged in a stepped manner. A first bearing (10) is sleeved on the inner ring. The first bearing (10) is fixed on the housing (2). Chain teeth (11) are arranged on the annular surface of the outer ring (9). The roller assembly includes a first crushing roller (12) and a second crushing roller (13) arranged vertically. The first crushing roller (12) and the second crushing roller (13) are arranged symmetrically vertically. A second bearing (14) is installed at each end of the first crushing roller (12) and the second crushing roller (13). The end of the second bearing (14) rotates in the first end cover (4) and the second end cover (5). The first crushing roller (13) and the second crushing roller (13) are driven to rotate by a second motor (15). The roller assembly includes a first screen plate (23) and a second screen plate (24). The first screen plate (23) and the second screen plate (24) are fixed between the first end cap (4) and the second end cap (5). The first screen plate (23) and the second screen plate (24) are arranged symmetrically up and down. There is a notch (25) at the interval between the first screen plate (23) and the second screen plate (24). A crushing assembly, which is installed on the drum assembly, crushes the coal ash. The first recovery pipe (6) is used to connect the discharge hopper (3) to recover fly ash; The second recycling pipe (7) is connected to the first recycling component; A reversing component is installed on the first recycling component to switch the circuits of the first recycling component and the second recycling component. The reversing component includes a swinging member (20). The swinging member (20) is rotatably restricted to the first recycling pipe (6) by a first pin (21). One end of the first pin (21) is rotatably restricted to the pipe wall of the first recycling pipe (6), and the other end is fixedly connected to a first sprocket (26). The first sprocket (26) is driven by a first motor (35). The first sprocket (26) and the chain teeth (11) are driven by a chain (27). An expansion chamber (22) is opened on the first recycling pipe (6) in the swing trajectory of the swinging member (20).

2. The boiler pulverized coal high-efficiency separation device according to claim 1, characterized in that: The roller assembly also includes a third crushing roller (28), and the first crushing roller (12), the second crushing roller (13) and the third crushing roller (28) are arranged in a triangular shape.

3. The boiler pulverized coal high-efficiency separation device according to claim 1, characterized in that: The reversing assembly includes a second swing member (29) and a third swing member (30). The first swing member (29) and the second swing member (30) are arranged crosswise along the first pin (21). The first swing member (29) has mesh holes on both sides, and the second swing member (30) is closed. The first pin (21) restricts the rotation of the second swing member (29) and the third swing member (30) to the first recovery tube (6).

4. The boiler pulverized coal high-efficiency separation device according to claim 1, characterized in that: The first pin (21) has one end that is restricted from rotating and the other end that is fixedly connected to the first sprocket (26). The first sprocket (26) is proportionally reduced according to the chain teeth (11).

5. The boiler pulverized coal high-efficiency separation device according to claim 3, characterized in that: The roller assembly includes a first screen plate (23) and a second screen plate (24). The first screen plate (23) and the second screen plate (24) are fixed between the first end cap (4) and the second end cap (5), and the first screen plate (23) and the second screen plate (24) are arranged adjacent to each other. There is a notch (25) at the interval between the first screen plate (23) and the second screen plate (24).

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