A coal powder burner air-coal mixer

Abstract

The present invention belongs to the technical field of pulverized coal mixed combustion, and particularly relates to a pulverized coal burner air-coal mixer, which includes a Roots blower, a secondary air duct, a mixer housing, a burner housing, a rotary nozzle, a sorting assembly, a feeding assembly, and a centrifugal fly ash separation assembly. The output end of the Roots blower is fixedly connected to one end of the secondary air duct, and the outside 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, and the rotary nozzle is rotatably connected to the outside of the output end of the burner housing. The sorting assembly is fixedly connected to the top of the mixer housing; in this device, a sorting assembly and a feeding assembly are added in the mixer housing. For medium-ash pulverized coal with an ash content between 15% and 30%, the sorting assembly can accurately select fine pulverized coal with a particle size of less than 0.5 mm, thereby releasing more heat energy. And by separating the fly ash in the ash, the centrifugal fly ash separation assembly can significantly reduce the dust pollution generated during the combustion process and improve the air quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of pulverized coal mixed combustion, and particularly relates to a wind-coal mixer for a pulverized coal burner. Background Art

[0002] In all production lines using rotary kiln calcination such as cement, steel, lime, nickel iron, red bauxite, etc., the pulverized coal burner plays an irreplaceable and very important role in actual production. The performance of the pulverized coal burner can directly affect the output of the products of the entire production line. The pulverized coal burner can be divided into a special pulverized coal burner for rotary kiln, a pulverized coal burner for boilers, and a special pulverized coal burner for asphalt mixing plants according to its use. The wind-coal mixer of the pulverized coal burner is mainly based on the process of air flow carrying pulverized coal and mixing with combustion-supporting air. That is, the pulverized coal is carried by the air flow and sprayed outwards from the fuel pipe at a certain diffusion angle. At the same time, the combustion-supporting air (including primary air, secondary air, etc.) enters the burner through different air ducts.

[0003] Pulverized coal can be classified according to different standards. It can be classified into high-ash pulverized coal, medium-ash pulverized coal, and low-ash pulverized coal according to the ash content. For medium-ash pulverized coal with an ash content between 15% and 30%, compared with low-ash pulverized coal, the ash content of this kind of pulverized coal is relatively high. Therefore, its calorific value is still relatively high. However, the increase in ash content will lead to an increase in solid waste generated during the combustion process. Although the traditional burner can open the furnace chamber within the specified time limit and remove the lumps on the inner wall of the furnace chamber, there are not only lumps in the ash, but also fly ash attached to the combustion-supporting air. The fly ash generally sprays out directly from the spray outlet of the burner. And the fly ash in the ash usually contains various harmful substances. If these substances are directly released into the environment, it will cause serious impacts 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.

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

[0005] To solve the problems raised in the above background art, the present invention provides a wind-coal mixer for a pulverized coal burner. The traditional burner can open the furnace chamber within the specified time limit and remove the lumps on the inner wall of the furnace chamber. However, there are not only lumps in the ash, but also fly ash attached to the combustion-supporting air. The fly ash generally sprays out directly from the spray outlet of the burner. And the fly ash in the ash usually contains various harmful substances. If these substances are directly released into the environment, it will cause serious impacts 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 object, the present invention provides the following technical solution: A pulverized coal 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 feeding assembly, and a centrifugal fly ash separation assembly. 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 feeding assembly is arranged at the lower end of the sorting assembly. The centrifugal fly ash separation assembly is sleeved on the outer side of the rotary nozzle;

[0007] The Roots blower cooperates with the secondary air duct to supply the air required for the continuous combustion of pulverized coal. The mixer housing is used to provide a sealed environment for the mixing of pulverized coal and combustion-supporting air. The burner housing 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 mixture of flue gas and other substances generated by combustion. The sorting assembly is used to select fine pulverized coal with a small particle size. The feeding assembly is used for the feeding of fine pulverized coal and conveying it into the burner housing. The centrifugal fly ash separation assembly is used for centrifugally separating fly ash in the ash.

[0008] Preferably, the sorting assembly includes a cross support, a sealing cover, a DC motor, a drive shaft, a pushing plate, a first material tray, and a filter plate. The cross support 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 support. The DC motor is threadedly connected inside the sealing cover. The drive shaft is fixedly connected to the outer side of the output end of the DC motor. The pushing plate is fixedly connected to the outer side of the bottom of the drive shaft. The bottom of the first material tray is threadedly connected to the outer side of the filter plate. The top surface of the filter plate abuts against the surface of the pushing plate.

[0009] Preferably, the feeding assembly includes a support base, a vertical vibration motor, an exciter, a shock isolation spring, a second material tray, and a fine orifice feeding frame. The vertical vibration motor is threadedly connected inside the support base. The exciter is fixedly connected above the output end of the vertical vibration motor. The shock isolation springs are annularly arranged around the vertical vibration motor. The second material tray is threadedly connected to the top of the exciter, and the top surface of the second material tray is fixedly connected to the bottom of the first material tray. The fine orifice feeding frame is fixedly connected to the bottom of the mixer housing.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] Preferably, the inner diameter of the mesh of the filter plate is 0.5 mm.

[0016] Preferably, the mixer housing is provided with material storage tanks symmetrically distributed outside the material outlet close to the material tray 1.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 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.

[0019] 2. In the present invention, the large particle cinder removed can be swept out along the outer side of the first material tray into the storage tank, which is convenient for the collection and re - pulverization of the large particle cinder. The design of the material guiding assembly enables the fine pulverized coal to smoothly fall into the blanking plate. Under the negative pressure condition of the operating blower, the fine pulverized coal at the bottom of the blanking plate enters the central air gathering port channel of the burner housing through the primary air duct. In the ignition state, it cooperates with the combustion - supporting air conveyed by the secondary air duct to ensure the continuity and stability of the combustion process.

[0020] 3. In the present invention, the device drives the rotating disk to rotate through the power motor, and then drives the conveyor belt and the conical filter cover to work together to effectively separate the fly dust in the ash. By accurately separating the fly dust in the ash, the centrifugal fly dust separation assembly can significantly reduce the dust pollution generated during the combustion process and improve the air quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The 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 to the present invention. In the drawings:

[0022] Figure 1 is the structural schematic diagram of the present invention;

[0023] Figure 2 is the side view of the burner housing in the present invention;

[0024] Figure 3 is the structural schematic diagram of the cross - section of the mixer housing in the present invention;

[0025] Figure 4 is the distribution diagram of the filter plate in the present invention;

[0026] Figure 5 is the exploded view of the sorting assembly and the material guiding assembly in the present invention;

[0027] Figure 6 is the structural schematic diagram of the inner side of the narrow - mouth blanking frame in the present invention;

[0028] Figure 7 is the structural schematic diagram of the blower and the primary air duct in the present invention;

[0029] Figure 8 is the structural schematic diagram of the cross - section of the burner housing in the present invention;

[0030] Figure 9 is the structural schematic diagram of the centrifugal fly dust separation assembly in the present invention.

[0031] In the figures:

[0032] 1. Roots blower; 2. Secondary air duct; 3. Mixer housing; 4. Burner housing; 5. Rotary nozzle; 6. Sorting component; 7. Feeding component; 8. Centrifugal fly ash separation component; 9. Cross support; 10. Sealing cover; 11. DC motor; 12. Drive shaft; 13. Pusher plate; 14. Tray 1; 15. Filter plate; 16. Support base; 17. Vertical vibration motor; 18. Vibrator; 19. Vibration isolation spring; 20. Tray 2; 21. Fine-mouth feeding frame; 22. Hollow baffle ring; 23. Conical filter cover; 24. Power motor; 25. Rotating disc; 26. Conveyor belt; 27. Fine material chute; 28. Feeding plate; 29. Blower; 30. Primary air duct; 31. Central air gathering port channel; 32. Swirl plate; 33. Drive motor; 34. Connecting shaft; 35. Poking piece; 36. Igniter; 37. Storage tank. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] As Figures 1-9 shown, a pulverized coal burner air-coal mixer includes a Roots blower 1, a secondary air duct 2, a mixer housing 3, a burner housing 4, a rotary nozzle 5, a sorting component 6, a feeding component 7, and a centrifugal fly ash separation component 8. The output end of the Roots blower 1 is fixedly connected to one end of the secondary air duct 2. The outside 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 outside of the output end of the burner housing 4. The sorting component 6 is fixedly connected to the top of the mixer housing 3. The feeding component 7 is arranged at the lower end of the sorting component 6. The centrifugal fly ash separation component 8 is sleeved outside the rotary nozzle 5;

[0035] The Roots blower 1 cooperates with the secondary air duct 2 to supply the air required for the continuous combustion of pulverized coal. The mixer housing 3 is used to provide a sealed environment for the mixing of pulverized coal and 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 mixture of flue gas and other substances generated by combustion. The sorting component 6 is used to select fine pulverized coal with a small particle size. The feeding component 7 is used for the feeding of fine pulverized coal and transporting it into the burner housing 4. The centrifugal fly ash separation component 8 is used for centrifugally separating the fly ash in the ash.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The centrifugal dust separation assembly 8 includes a hollow baffle ring 22, a conical filter cover 23, a power motor 24, a rotating disk 25 and a conveyor belt 26. The hollow baffle 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 rotary 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 closely attached to the outside of the rotating disk 25 and the rotary nozzle 5.

[0041] During the mixing process, the first material tray 14 closely cooperates with the filter plate 15. The inner diameter of the mesh holes of the filter plate 15 is 0.5 mm, which can accurately select fine pulverized coal with small particle sizes. The fine pulverized coal falls into the lower second material tray 20 through the filter plate 15, while the larger particles are blocked by the filter plate 15. At the same time, the DC motor 11 at the top is started, and the DC motor 11 drives the drive shaft 12 to rotate. The drive shaft 12 drives the push plate 13 to rotate, and the push plate sweeps the large-particle coal cinder out along both sides of the mixer housing 3 into the storage tank 37 for subsequent collection and re-grinding.

[0042] On both sides of the bottom of the narrow-mouth feeding frame 21, there are also provided narrow material grooves 27, and the top of the narrow material grooves 27 is provided with an inclined landslide structure.

[0043] Below the narrow material groove 27, there are also provided a feeding plate 28, a blower 29 and a primary air duct 30. The feeding plate 28 is fixedly connected to the bottom of the narrow-mouth feeding frame 21. The output end of the blower 29 is fixedly connected to the inner surface of one side of the feeding plate 28. The primary air duct 30 is fixedly connected to the other side of the feeding plate 28, and the outside of the primary air duct 30 is fixedly connected to the inner surface of the burner housing 4.

[0044] The guiding material assembly 7 utilizes the vibration generated by the vertical vibration motor 17 and the vibrator 18 to enable the fine pulverized coal in the second material tray 20 to be smoothly fed through the narrow-mouth feeding frame 21. On both sides of the bottom of the narrow-mouth feeding frame 21, there are narrow material grooves 27 with an inclined landslide structure, which further promotes the smooth flow of the fine pulverized coal into the feeding plate 28. Then, the blower 29 is started. Under negative pressure conditions, the fine pulverized coal is mixed with the combustion-supporting air and blown into the primary air duct 30 together. The outside of the primary air duct 30 is tightly fixed to the inner surface of the burner housing 4 to ensure that the mixture of air and pulverized coal can be accurately fed into the combustion area of the burner housing 4.

[0045] Inside the burner housing 4, there is also provided a central air gathering port channel 31 and a swirl plate 32. The central air gathering port channel 31 is fixedly connected inside the burner housing 4, and the swirl plate 32 is spirally distributed inside the central air gathering port channel 31.

[0046] Inside the burner housing 4, there are a central air gathering port passage 31 and a swirl plate 32. These structures can optimize the mixing of air and pulverized coal and improve the combustion efficiency. The mixture of flue gas and other substances generated by combustion is output through the rotary nozzle 5.

[0047] At the bottom of the narrow-mouth feeding frame 21, there are also a driving motor 33, a connecting shaft 34, and a feeding blade 35. The driving motor 33 is threadedly connected to the bottom of the narrow-mouth feeding frame 21. The connecting shaft 34 is fixedly connected to the outside of the output end of the driving motor 33. The feeding blade 35 is fixedly connected to the top of the connecting shaft 34.

[0048] The inner diameter of the mesh holes of the filter plate 15 is 0.5 mm.

[0049] On the outside of the discharge port of the mixer housing 3 near the first material tray 14, there are also symmetrically distributed storage tanks 37.

[0050] Start the external power motor 24. The power motor 24 drives the rotating disk 25 to rotate. The conveyor belt 26 closely adheres to the outside of the rotating disk 25 and the rotary nozzle 5, forming a closed centrifugal separation channel. The fly ash in the flue gas is separated under the action of centrifugal force and adheres to the conical filter cover 23, while the clean gas continues to be discharged.

[0051] Working principle: During use, the Roots blower 1 can be started to provide the 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 air can be accurately sent into 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-supporting air. During the mixing process, the first material tray 14 and the filter plate 15 are closely matched. The inner diameter of the mesh holes of the filter plate 15 is 0.5 mm, which can accurately select fine coal powder with small particle sizes. The fine coal powder falls into the second 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 at the top is started, and the DC motor 11 drives the drive shaft 12 to rotate. The drive shaft 12 drives the push plate 13 to rotate, and the push plate sweeps the large-particle coal cinder out along both sides of the mixer housing 3 into the storage tank 37 for subsequent collection and re-crushing. The guiding component 7 uses the vibration generated by the vertical vibration motor 17 and the vibrator 18 to enable the fine coal powder in the second material tray 20 to be smoothly discharged through the fine orifice feeding frame 21. The bottom sides of both sides of the fine orifice feeding frame 21 are provided with inclined landslide-structured fine material troughs 27 to further promote the smooth flow of the 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 housing 4 to ensure that the mixture of air and coal powder can be accurately sent into the combustion area of the burner housing 4. Inside the burner housing 4, the igniter 36 is turned on, and the mixture is ignited to form a high-temperature flame, releasing a large amount of heat energy. The center air gathering port channel 31 and the swirl plate 32 are arranged inside the burner housing 4, and these structures can optimize the mixing of air and coal powder and improve the combustion efficiency. The mixture of flue gas and other substances generated by combustion is output through the rotary nozzle 5. At the same time, the power motor 24 on the outside is started, and the power motor 24 drives the rotating disk 25 to rotate. The conveyor belt 26 is closely attached to the outside of the rotating disk 25 and the rotary nozzle 5 to form a closed centrifugal separation channel. The fly ash in the flue gas is separated under the action of centrifugal force and adheres to the conical filter cover 23, while the clean gas continues to be discharged. When the process ends, the cloth for cleaning can be inserted into the bottom of the hollow baffle ring 22, and then the conical filter cover 23 is slowly rotated, so as to wipe the fly ash and achieve the rapid cleaning of the conical filter cover 23.

[0052] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A coal powder burner air-coal mixer, characterized in that, It includes 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 feeding assembly (7) and a centrifugal fly ash separation assembly (8). The output end of the Roots blower (1) is fixedly connected to one end of the secondary air duct (2). The outside 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 outside 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 feeding assembly (7) is arranged at the lower end of the sorting assembly (6). The centrifugal fly ash separation assembly (8) is sleeved on the outside of the rotary nozzle (5); The Roots blower (1) cooperates with the secondary air duct (2) to supply the air required for the continuous combustion of pulverized coal. The mixer housing (3) is used to provide a sealed environment for the mixing of pulverized coal and combustion-supporting air. The burner housing (4) is used to ignite the mixture to form a high-temperature flame and release a large amount of heat energy. The rotary nozzle (5) is used to output the mixture of flue gas and other substances generated by combustion. The sorting assembly (6) is used to select fine pulverized coal with a small particle size. The feeding assembly (7) is used for the feeding of fine pulverized coal and conveying it to the inside of the burner housing (4). The centrifugal fly ash separation assembly (8) is used for centrifugally separating the fly ash in the ash; The sorting assembly (6) includes a cross bracket (9), a sealing cover (10), a DC motor (11), a drive shaft (12), a pushing plate (13), a first 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 drive shaft (12) is fixedly connected to the outside of the output end of the DC motor (11). The pushing plate (13) is fixedly connected to the outside of the bottom of the drive shaft (12). The bottom of the first material tray (14) is threadedly connected to the outside of the filter plate (15). The top surface of the filter plate (15) abuts against the surface of the pushing plate (13); 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).

2. The pulverized coal burner air-coal mixer according to claim 1, wherein: 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).

3. The pulverized coal burner air-coal mixer according to claim 1, wherein: 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.

4. The pulverized coal burner air-coal mixer according to claim 3, 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).

5. The pulverized coal burner air-coal mixer according to claim 4, wherein: 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).

6. The pulverized coal burner air-coal mixer according to claim 3, wherein: 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).

7. The pulverized coal burner air-coal mixer according to claim 1, characterized in that: The inner diameter of the mesh of the filter plate (15) is 0.5 mm.

8. The pulverized coal burner air-coal mixer according to claim 1, 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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