Air-coal mixer of pulverized coal burner

Abstract

The invention belongs to the technical field of pulverized coal mixed combustion, and particularly relates to a pulverized coal burner air-coal mixer which comprises a Roots blower, a secondary air pipe, a mixer shell, a burner shell, a rotary nozzle, a sorting assembly, a material guide assembly and a centrifugal flying dust separation assembly. The outer side of the secondary air pipe is fixedly connected to the middle of one side of the combustor shell, the mixer shell is arranged above the secondary air pipe, the rotary nozzle is rotationally connected to the outer side of the output end of the combustor shell, and the sorting assembly is fixedly connected to the top of the mixer shell. According to the device, the sorting assembly and the material guiding assembly are additionally arranged in the mixer shell, the sorting assembly can accurately select fine coal powder with the particle size being smaller than 0.5 mm for medium-ash-content coal powder with the ash content ranging from 15% to 30%, so that more heat energy is released, flying dust in the ash content is separated, and the ash content of the medium-ash-content coal powder is more uniform. The centrifugal flying dust separation assembly can remarkably reduce dust pollution generated in the combustion process, and the air quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pulverized coal mixed combustion, and in particular relates to an air-coal mixer for a pulverized coal burner. Background Art

[0002] In cement, steel, lime, ferronickel, red alum and other production lines that use rotary kiln calcination, pulverized coal burners are irreplaceable and play a very important role in actual production. The performance of pulverized coal burners can directly affect the output of the entire production line. Pulverized coal burners can be divided into pulverized coal burners for rotary kilns, pulverized coal burners for boilers, and pulverized coal burners for asphalt mixing plants according to their uses. The air-coal mixer of the pulverized coal burner is mainly based on the process of airflow carrying pulverized coal and mixing it with combustion-supporting air. That is, the pulverized coal is carried by the airflow and sprayed out from the fuel pipeline at a certain diffusion angle, and the combustion-supporting air (including primary air, secondary air, etc.) enters the burner through different air ducts.

[0003] Coal powder can be classified according to different standards, and can be classified into high-ash coal powder, medium-ash coal powder and low-ash coal powder according to ash content. For medium-ash coal powder with an ash content between 15% and 30%, compared with low-ash coal powder, this type of coal powder has a higher ash content, so its calorific value is still higher, but the increase in ash content will lead to an increase in solid waste generated during the combustion process. Although traditional burners can open the furnace and remove agglomerates on the inner wall of the furnace within the specified time limit, the ash contains not only agglomerates, but also fly ash attached to the combustion air. The fly ash is generally ejected directly from the burner outlet, and the fly ash in the ash usually contains a variety of harmful substances. If these substances are directly released into the environment, they will have a serious impact on the environment and human health; and when the coal particles are too large, the air may not be able to effectively penetrate into the interior of the coal, resulting in incomplete coal combustion, thereby reducing combustion efficiency.

[0004] Therefore, a pulverized coal burner air-coal mixer is designed to solve the above problems. Summary of the invention

[0005] To solve the problems raised in the above background technology. The present invention provides a coal powder burner air-coal mixer. The traditional burner can open the furnace within the specified time limit and remove the agglomerates on the inner wall of the furnace, but the ash contains not only agglomerates, but also flying dust attached to the combustion-supporting air. The flying dust is generally ejected directly from the burner's ejection port, and the flying dust in the ash usually contains a variety of harmful substances. If these substances are directly released into the environment, they will have a serious impact on the environment and human health; and when the coal particles are too large, the air may not be able to effectively penetrate into the interior of the coal, resulting in incomplete combustion of the coal, thereby reducing the combustion efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a coal powder burner air-coal mixer, comprising a Roots blower, a secondary air duct, a mixer housing, a burner housing, a rotary nozzle, a sorting assembly, a material guide assembly and a centrifugal fly ash separation assembly, wherein the output end of the Roots blower is fixedly connected to one end of the secondary air duct, the outer side of the secondary air duct is fixedly connected to the middle of one side of the burner housing, the mixer housing is arranged above the secondary air duct, the rotary nozzle is rotatably connected to the outer side of the output end of the burner housing, the sorting assembly is fixedly connected to the top of the mixer housing, the material guide assembly is arranged at the lower end of the sorting assembly, and the centrifugal fly ash separation assembly is sleeved on the outer side of the rotary nozzle; The Roots blower cooperates with the secondary air duct to supplement the air required for the continued combustion of coal powder. The mixer shell is used to provide a sealed environment for the mixing of coal powder and combustion-supporting air. The burner shell is used to ignite the mixture to form a high-temperature flame and release a large amount of heat energy. The rotary nozzle is used to output the smoke and other material mixtures produced by combustion. The sorting component is used to select fine coal powder with small particle size. The material guide component is used to discharge the fine coal powder and transport it to the inside of the burner shell. The centrifugal fly ash separation component is used to centrifugally separate fly ash from the ash.

[0007] Preferably, the sorting assembly includes a cross bracket, a sealing cover, a DC motor, a driving shaft, a push plate, a material tray and a filter plate, the cross bracket is fixedly connected to the inner side of the top of the mixer housing, the sealing cover is fixedly connected to the bottom of the cross bracket, the DC motor is threadedly connected to the inside of the sealing cover, the driving shaft is fixedly connected to the outer side of the output end of the DC motor, the push plate is fixedly connected to the outer side of the bottom of the driving shaft, the bottom of the material tray is threadedly connected to the outer side of the filter plate, and the top surface of the filter plate is in conflict with the surface of the push plate.

[0008] Preferably, the material guiding assembly comprises a supporting base, a vertical vibration motor, a vibration exciter, a seismic isolation spring, a second material tray and a narrow-mouthed material discharge frame, the vertical vibration motor is threadedly connected to the inner side of the supporting base, the vibration exciter is fixedly connected above the output end of the vertical vibration motor, the annular array of seismic isolation springs is on the periphery of the vertical vibration motor, the second material tray is threadedly connected to the top of the vibration exciter, and the top surface of the second material tray is fixedly connected to the bottom of the first material tray, and the narrow-mouthed material discharge frame is fixedly connected to the bottom of the mixer housing.

[0009] Preferably, the centrifugal fly ash separation assembly includes a hollow material retaining ring, a conical filter cover, a power motor, a rotating disk and a conveyor belt, the hollow material retaining ring is fixedly connected to the outside of the burner shell, one side of the conical filter cover is fixedly connected to one end of the rotating nozzle, and the conical filter cover is rotatably connected to the outside of the burner shell, the output end of the power motor is fixedly connected to one side of the rotating disk, and the conveyor belt is tightly fitted to the rotating disk and the outside of the rotating nozzle.

[0010] Preferably, both sides of the bottom of the narrow-mouthed material discharge frame are further provided with fine material troughs, and the top of the fine material trough is provided as an inclined landslide structure.

[0011] Preferably, a feed plate, a blower and a primary air duct are also provided below the fine material trough, the feed plate is fixedly connected to the bottom of the fine-mouth feed frame, the output end of the blower is fixedly connected to the inner surface of one side of the feed plate, the primary air duct is fixedly connected to the other side of the feed plate, and the outer side of the primary air duct is fixedly connected to the inner surface of the burner shell.

[0012] Preferably, a central wind gathering channel and a swirl plate are further provided inside the burner shell. The central wind gathering channel is fixedly connected to the inside of the burner shell, and the swirl plate is spirally distributed inside the central wind gathering channel.

[0013] Preferably, a driving motor, a connecting shaft and a material shifting piece are also provided at the bottom of the narrow-mouth blanking frame, the driving motor is threadedly connected to the bottom of the narrow-mouth blanking frame, the connecting shaft is fixedly connected to the outside of the output end of the driving motor, and the material shifting piece is fixedly connected to the top of the connecting shaft.

[0014] Preferably, the inner diameter of the mesh of the filter plate is 0.5 mm.

[0015] Preferably, the mixer housing is provided with material storage tanks symmetrically distributed outside the material outlet close to the material tray 1.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, a sorting component and a material guiding component are added to the mixer shell of the device. For medium-ash coal powder with an ash content between 15% and 30%, the sorting component can accurately select fine coal powder with a particle size of less than 0.5 mm. These fine coal powders can burn more fully during the combustion process and release more heat energy.

[0017] 2. In the present invention, the screened out large-particle coal slag can be swept out along the outer side of the material tray into the storage tank, which is convenient for the collection and re-crushing of the large-particle coal slag. The design of the material guide component enables the fine coal powder to be smoothly discharged into the discharge plate, and under the negative pressure condition of the running blower, the fine coal powder falling to the bottom of the discharge plate enters the central wind gathering channel of the burner shell through the primary air duct. In the ignition state, the combustion-supporting air transported by the secondary air duct is cooperated to ensure the continuity and stability of the combustion process.

[0018] 3. In the present invention, the device drives the rotating disk to rotate through a power motor, thereby driving the conveyor belt and the conical filter cover to work together to achieve effective separation of fly ash in the ash. By accurately separating the fly ash in the ash, the centrifugal fly ash separation component can significantly reduce the dust pollution generated during the combustion process and improve the air quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is a side view of the burner housing of the present invention; Figure 3 It is a structural schematic diagram of a section of a mixer housing in the present invention; Figure 4 is a distribution diagram of the filter plate in the present invention; Figure 5 It is an exploded view of the sorting component and the material guiding component in the present invention; Figure 6 It is a schematic diagram of the structure of the inner side of the narrow-mouth blanking frame in the present invention; Figure 7 It is a schematic diagram of the structure of the blower and the primary air duct in the present invention; Figure 8 It is a structural schematic diagram of the cross section of the burner shell in the present invention; Fig. 9 It is a structural schematic diagram of the centrifugal fly ash separation component in the present invention.

[0020] In the figure: 1. Roots blower; 2. Secondary air duct; 3. Mixer housing; 4. Burner housing; 5. Rotary nozzle; 6. Sorting assembly; 7. Material guide assembly; 8. Centrifugal fly ash separation assembly; 9. Cross bracket; 10. Sealing cover; 11. DC motor; 12. Drive shaft; 13. Push plate; 14. Material tray 1; 15. Filter plate; 16. Support base; 17. Vertical vibration motor; 18. Vibrator; 19. Isolator Vibration spring; 20. Feed tray 2; 21. Fine-mouth feed frame; 22. Hollow material retaining ring; 23. Conical filter cover; 24. Power motor; 25. Rotating disk; 26. Conveyor belt; 27. Fine-material trough; 28. Feed plate; 29. ​​Blower; 30. Primary air duct; 31. Central air gathering channel; 32. Swirl plate; 33. Drive motor; 34. Connecting shaft; 35. Feeding piece; 36. Igniter; 37. Material storage tank. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1-Figure 9 The coal-fired air-coal mixer of a pulverized coal burner shown in the figure comprises a Roots blower 1, a secondary air duct 2, a mixer housing 3, a burner housing 4, a rotary nozzle 5, a sorting assembly 6, a material guide assembly 7 and a centrifugal fly ash separation assembly 8, wherein the output end of the Roots blower 1 is fixedly connected to one end of the secondary air duct 2, the outer side of the secondary air duct 2 is fixedly connected to the middle of one side of the burner housing 4, the mixer housing 3 is arranged above the secondary air duct 2, the rotary nozzle 5 is rotatably connected to the outer side of the output end of the burner housing 4, the sorting assembly 6 is fixedly connected to the top of the mixer housing 3, the material guide assembly 7 is arranged at the lower end of the sorting assembly 6, and the centrifugal fly ash separation assembly 8 is sleeved on the outer side of the rotary nozzle 5; The Roots blower 1 cooperates with the secondary air duct 2 to supplement the air required for the continued combustion of the coal powder. The mixer shell 3 is used to provide a sealed environment for the mixing of the coal powder and the combustion-supporting air. The burner shell 4 is used to ignite the mixture and form a high-temperature flame and release a large amount of heat energy. The rotary nozzle 5 is used to output the smoke and other material mixtures produced by the combustion. The sorting component 6 is used to select fine coal powder with small particle size. The material guide component 7 is used to discharge the fine coal powder and transport it to the inside of the burner shell 4. The centrifugal fly ash separation component 8 is used to centrifugally separate the fly ash in the ash.

[0023] The device innovatively adds a sorting component 6 and a material guide component 7 in the mixer housing 3, which is specially designed for processing medium-ash coal powder with an ash content between 15% and 30%. The sorting component 6 can accurately separate fine coal powder with a particle size of less than 0.5mm by virtue of its high-precision screening ability. These carefully selected fine coal powders can show more excellent combustion performance in the subsequent combustion link, achieve more complete and thorough combustion, and thus greatly increase the release of heat energy.

[0024] The sorting assembly 6 includes a cross bracket 9, a sealing cover 10, a DC motor 11, a driving shaft 12, a push plate 13, a material tray 14 and a filter plate 15. The cross bracket 9 is fixedly connected to the inner side of the top of the mixer housing 3, the sealing cover 10 is fixedly connected to the bottom of the cross bracket 9, the DC motor 11 is threadedly connected to the inside of the sealing cover 10, the driving shaft 12 is fixedly connected to the outer side of the output end of the DC motor 11, the push plate 13 is fixedly connected to the outer side of the bottom of the driving shaft 12, the bottom of the material tray 14 is threadedly connected to the outer side of the filter plate 15, and the top surface of the filter plate 15 conflicts with the surface of the push plate 13.

[0025] The material guiding assembly 7 includes a supporting base 16, a vertical vibration motor 17, an exciter 18, a seismic isolation spring 19, a material tray 20 and a narrow-mouthed material discharge frame 21. The vertical vibration motor 17 is threadedly connected to the inner side of the supporting base 16, the exciter 18 is fixedly connected above the output end of the vertical vibration motor 17, the seismic isolation spring 19 is arranged in a circular array on the periphery of the vertical vibration motor 17, the material tray 20 is threadedly connected to the top of the exciter 18, and the top surface of the material tray 20 is fixedly connected to the bottom of the material tray 1 14, and the narrow-mouthed material discharge frame 21 is fixedly connected to the bottom of the mixer housing 3.

[0026] The large particles of coal slag that are screened out can be smoothly swept into the storage tank 37 along the outer edge of the material tray 14, and the material guide assembly 7 ensures that the fine coal powder can fall into the inside of the discharge plate 28 through the narrow-mouth discharge frame 21 without hindrance. Under the negative pressure generated by the blower 29, the fine coal powder at the bottom of the discharge plate 28 is accurately guided to the primary air duct and smoothly enters the central air gathering channel 31 in the burner shell 4. After the igniter 36 is started, these fine coal powders work closely with the sufficient combustion-supporting air delivered through the secondary air duct 2 to ensure the continuity, stability and efficiency of the combustion process.

[0027] The centrifugal fly ash separation assembly 8 includes a hollow material retaining ring 22, a conical filter cover 23, a power motor 24, a rotating disk 25 and a conveyor belt 26. The hollow material retaining ring 22 is fixedly connected to the outside of the burner housing 4, one side of the conical filter cover 23 is fixedly connected to one end of the rotating nozzle 5, and the conical filter cover 23 is rotatably connected to the outside of the burner housing 4, the output end of the power motor 24 is fixedly connected to one side of the rotating disk 25, and the conveyor belt 26 is tightly fitted to the outside of the rotating disk 25 and the rotating nozzle 5.

[0028] During the mixing process, the material tray 14 and the filter plate 15 are closely matched. The inner diameter of the mesh of the filter plate 15 is 0.5mm, which can accurately select fine coal powder with small particle size. The fine coal powder falls into the material tray 20 below through the filter plate 15, while the larger particles are blocked by the filter plate 15. At the same time, the DC motor 11 on the top is started, and the DC motor 11 drives the driving shaft 12 to rotate. The driving shaft 12 drives the pushing plate 13 to rotate, and the material stripping plate sweeps the large particles of coal slag along the two sides of the mixer housing 3 into the storage tank 37 for subsequent collection and re-crushing.

[0029] Fine material troughs 27 are also provided on both sides of the bottom of the fine-mouthed material discharge frame 21, and the top of the fine material trough 27 is provided as an inclined landslide structure.

[0030] A feed plate 28, a blower 29 and a primary air duct 30 are also provided below the fine material trough 27. The feed plate 28 is fixedly connected to the bottom of the fine-mouth feed frame 21, the output end of the blower 29 is fixedly connected to the inner surface of one side of the feed plate 28, the primary air duct 30 is fixedly connected to the other side of the feed plate 28, and the outer side of the primary air duct 30 is fixedly connected to the inner surface of the burner shell 4.

[0031] The material guide assembly 7 utilizes the vibration generated by the vertical vibration motor 17 and the exciter 18 to smoothly discharge the fine coal powder in the material tray 20 through the narrow-mouthed material discharge frame 21. The bottom sides of the narrow-mouthed material discharge frame 21 are provided with inclined landslide structure fine material troughs 27 to further promote the smooth flow of fine coal powder into the discharge plate 28. After that, the blower 29 is started. Under negative pressure conditions, the fine coal powder is mixed with the combustion-supporting air and blown into the primary air duct 30. The outer side of the primary air duct 30 is tightly fixed to the inner surface of the burner shell 4 to ensure that the mixture of air and coal powder can be accurately delivered to the combustion area of ​​the burner shell 4.

[0032] A central wind gathering channel 31 and a swirl plate 32 are also provided inside the burner shell 4 . The central wind gathering channel 31 is fixedly connected to the inside of the burner shell 4 , and the swirl plate 32 is spirally distributed inside the central wind gathering channel 31 .

[0033] The burner housing 4 is provided with a central air converging channel 31 and a swirl plate 32, which can optimize the mixing of air and coal powder and improve the combustion efficiency. The smoke and other substances generated by the combustion are output through the rotary nozzle 5.

[0034] A driving motor 33, a connecting shaft 34 and a material shifting piece 35 are also provided at the bottom of the narrow-mouth blanking frame 21. The driving motor 33 is threadedly connected to the bottom of the narrow-mouth blanking frame 21, the connecting shaft 34 is fixedly connected to the outer side of the output end of the driving motor 33, and the material shifting piece 35 is fixedly connected to the top of the connecting shaft 34.

[0035] The inner diameter of the mesh of the filter plate 15 is 0.5 mm.

[0036] Material storage tanks 37 are symmetrically distributed outside the mixer housing 3 near the material outlet 14.

[0037] The outer power motor 24 is started, and the power motor 24 drives the rotating disk 25 to rotate. The conveyor belt 26 is tightly attached to the outer side of the rotating disk 25 and the rotary nozzle 5 to form a closed centrifugal separation channel. The flying dust in the flue gas is separated and attached to the conical filter cover 23 under the action of centrifugal force, and the clean gas continues to be discharged.

[0038] Working principle: When in use, the Roots blower 1 can be started to provide necessary supplementary air for coal powder combustion. The secondary air duct 2 is fixed in the middle of one side of the burner housing 4 to ensure that the air can be accurately delivered to the combustion area. The mixer housing 3 is located above the secondary air duct 2, providing a sealed and efficient environment for the mixing of coal powder and combustion air. During the mixing process, the material tray 14 is closely matched with the filter plate 15. The inner diameter of the mesh of the filter plate 15 is 0.5mm, which can accurately select fine coal powder with small particle size. The fine coal powder passes through the filter plate 15 and falls into the material tray 20 below, while the larger particles are blocked by the filter plate 15. At the same time, the DC motor 11 on the top is started, and the DC motor 11 drives the drive shaft 12 to rotate, and the drive shaft 12 drives the push plate 13 to rotate. The return plate sweeps the large particles of coal slag along both sides of the mixer shell 3 into the storage tank 37 for subsequent collection and re-crushing. The material guide component 7 uses the vibration generated by the vertical vibration motor 17 and the exciter 18 to allow the fine coal powder in the material tray 20 to be smoothly discharged through the narrow-mouth discharge frame 21. The bottom sides of the narrow-mouthed feeding frame 21 are provided with inclined landslide structure fine material troughs 27 to further promote the smooth flow of fine coal powder into the feeding plate 28. Then the blower 29 is started. Under negative pressure conditions, the fine coal powder is mixed with the combustion-supporting air and blown into the primary air duct 30. The outer side of the primary air duct 30 is tightly fixed to the inner surface of the burner shell 4 to ensure that the mixture of air and coal powder can be accurately delivered to the combustion area of ​​the burner shell 4. In the burner shell 4, the igniter 36 is turned on, the mixture is ignited and forms a high-temperature flame, releasing a large amount of heat energy. The interior of the burner shell 4 is provided with a central wind gathering channel 31 and a swirl plate 32. These structures can optimize the mixing of air and coal powder and improve combustion efficiency. The smoke and other substances produced by the combustion are output through the rotating nozzle 5. At the same time, the power motor 24 on the outside is started, the power motor 24 drives the rotating disk 25 to rotate, and the conveyor belt 26 is closely attached to the outside of the rotating disk 25 and the rotating nozzle 5 to form a closed centrifugal separation channel. The flying dust in the smoke is separated and attached to the conical filter cover 23 under the action of centrifugal force, and the clean gas continues to be discharged. When the process is completed, the cloth used for cleaning can be inserted into the bottom of the hollow retaining ring 22, and then the conical filter cover 23 is slowly rotated to wipe the flying dust and achieve rapid cleaning of the conical filter cover 23.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coal powder burner air-coal mixer, characterized in that: The invention comprises a Roots blower (1), a secondary air duct (2), a mixer housing (3), a burner housing (4), a rotary nozzle (5), a sorting assembly (6), a material guide assembly (7) and a centrifugal fly ash separation assembly (8), wherein the output end of the Roots blower (1) is fixedly connected to one end of the secondary air duct (2), the outer side of the secondary air duct (2) is fixedly connected to the middle part of one side of the burner housing (4), the mixer housing (3) is arranged above the secondary air duct (2), the rotary nozzle (5) is rotatably connected to the outer side of the output end of the burner housing (4), the sorting assembly (6) is fixedly connected to the top of the mixer housing (3), the material guide assembly (7) is arranged at the lower end of the sorting assembly (6), and the centrifugal fly ash separation assembly (8) is sleeved on the outer side of the rotary nozzle (5); The Roots blower (1) cooperates with the secondary air duct (2) to supplement the air required for the continued combustion of the coal powder. The mixer housing (3) is used to provide a sealed environment for the mixing of the coal powder and the combustion-supporting air. The burner housing (4) is used to ignite the mixture and form a high-temperature flame and release a large amount of heat energy. The rotary nozzle (5) is used to output the smoke generated by the combustion and a mixture of other substances. The sorting component (6) is used to select fine coal powder with a small particle size. The material guide component (7) is used to discharge the fine coal powder and transport it to the inside of the burner housing (4). The centrifugal fly ash separation component (8) is used to centrifugally separate the fly ash in the ash.

2. The air-coal mixer for a pulverized coal burner according to claim 1, characterized in that: The sorting assembly (6) comprises a cross bracket (9), a sealing cover (10), a DC motor (11), a driving shaft (12), a push plate (13), a material tray (14) and a filter plate (15), wherein the cross bracket (9) is fixedly connected to the inner side of the top of the mixer housing (3), the sealing cover (10) is fixedly connected to the bottom of the cross bracket (9), the DC motor (11) is threadedly connected to the inside of the sealing cover (10), the driving shaft (12) is fixedly connected to the outer side of the output end of the DC motor (11), the push plate (13) is fixedly connected to the outer side of the bottom of the driving shaft (12), the bottom of the material tray (14) is threadedly connected to the outer side of the filter plate (15), and the top surface of the filter plate (15) is in conflict with the surface of the push plate (13).

3. The air-coal mixer for a pulverized coal burner according to claim 2, characterized in that: The material guide assembly (7) comprises a support base (16), a vertical vibration motor (17), an exciter (18), a seismic isolation spring (19), a second material tray (20) and a narrow-mouth material discharge frame (21), wherein the vertical vibration motor (17) is threadedly connected to the inner side of the support base (16), the exciter (18) is fixedly connected above the output end of the vertical vibration motor (17), the seismic isolation spring (19) is arranged in an annular array on the periphery of the vertical vibration motor (17), the second material tray (20) is threadedly connected to the top of the exciter (18), and the top surface of the second material tray (20) is fixedly connected to the bottom of the first material tray (14), and the narrow-mouth material discharge frame (21) is fixedly connected to the bottom of the mixer housing (3).

4. The air-coal mixer for a pulverized coal burner according to claim 1, characterized in that: The centrifugal fly ash separation assembly (8) comprises a hollow material retaining ring (22), a conical filter cover (23), a power motor (24), a rotating disk (25) and a conveyor belt (26); the hollow material retaining ring (22) is fixedly connected to the outside of the burner housing (4); one side of the conical filter cover (23) is fixedly connected to one end of the rotating nozzle (5); and the conical filter cover (23) is rotatably connected to the outside of the burner housing (4); the output end of the power motor (24) is fixedly connected to one side of the rotating disk (25); and the conveyor belt (26) is tightly fitted to the rotating disk (25) and the outside of the rotating nozzle (5).

5. The air-coal mixer for a pulverized coal burner according to claim 3, characterized in that: Fine material troughs (27) are also provided on both sides of the bottom of the fine-mouthed material discharge frame (21), and the top of the fine material trough (27) is provided as an inclined landslide structure.

6. The air-coal mixer for a pulverized coal burner according to claim 5, characterized in that: A feed plate (28), a blower (29) and a primary air duct (30) are also provided below the fine material trough (27); the feed plate (28) is fixedly connected to the bottom of the fine-mouth feed frame (21); the output end of the blower (29) is fixedly connected to the inner surface of one side of the feed plate (28); the primary air duct (30) is fixedly connected to the other side of the feed plate (28); and the outer side of the primary air duct (30) is fixedly connected to the inner surface of the burner housing (4).

7. The air-coal mixer for a pulverized coal burner according to claim 6, characterized in that: A central wind gathering channel (31) and a swirl plate (32) are also provided inside the burner housing (4); the central wind gathering channel (31) is fixedly connected inside the burner housing (4); and the swirl plate (32) is spirally distributed inside the central wind gathering channel (31).

8. The air-coal mixer for a pulverized coal burner according to claim 5, characterized in that: A driving motor (33), a connecting shaft (34) and a material shifting piece (35) are also provided at the bottom of the narrow-mouth material blanking frame (21); the driving motor (33) is threadedly connected to the bottom of the narrow-mouth material blanking frame (21); the connecting shaft (34) is fixedly connected to the outside of the output end of the driving motor (33); and the material shifting piece (35) is fixedly connected to the top of the connecting shaft (34).

9. The air-coal mixer for a pulverized coal burner according to claim 2, characterized in that: The inner diameter of the mesh of the filter plate (15) is 0.5 mm.

10. The air-coal mixer for a pulverized coal burner according to claim 2, characterized in that: Material storage tanks (37) are symmetrically distributed on the outer side of the mixer housing (3) near the material outlet of the first material tray (14).

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