A plasma pulverized coal burner assembly and its operating method

Abstract

This invention discloses a plasma pulverized coal burner assembly and its operating method, comprising: pre-pulverizing pulverized coal using a pulverizing assembly composed of dual pulverizing rollers and meshing gears to prevent pulverized coal agglomeration, making the pulverized coal particles more uniform, significantly increasing the contact area with the plasma arc zone, and effectively improving ignition efficiency and combustion completeness; using a feeding auger structure to achieve stable pulverized coal conveying, with the sprocket and chain linkage between the pulverizing rollers and the feeding auger driving the system, eliminating the need for a separate drive source, simplifying the equipment structure, and reducing energy consumption and cost; protecting the transmission components with a protective cover to reduce dust adhesion and wear, and extending service life; and using a flexible sealed feeding cover made of high-temperature and wear-resistant corrugated metal hose to achieve flexible sealing connection, absorb equipment vibration, prevent pipeline loosening or weld cracking, and improve equipment operational reliability.

Description

Technical Field

[0001] This invention belongs to the field of pulverized coal burner technology, and relates to a plasma pulverized coal burner assembly and its working method. Background Technology

[0002] Plasma pulverized coal burners are core devices for achieving efficient pulverized coal combustion in industrial furnaces, boilers, rotary kilns, and other equipment. Relying on high-temperature plasma ignition technology, they can rapidly ignite pulverized coal and possess characteristics such as strong coal adaptability and stable ignition, making them widely used in industrial combustion. However, current conventional plasma pulverized coal burners have significant shortcomings in structural design and feeding methods, leading to several operational problems in actual use. Most existing equipment directly uses purchased raw coal or uncrushed pulverized coal as fuel. During storage and transportation, the pulverized coal is prone to agglomeration, resulting in uneven particle size distribution. After entering the burner, it cannot fully contact the high-temperature plasma arc zone, leading to low ignition efficiency and incomplete combustion. This not only reduces heat conversion efficiency but also easily causes slagging and coking, affecting the normal operation of the burner. Simultaneously, traditional feeding structures often use gravity feeding or simple pipeline conveying, lacking a stable and controllable quantitative feeding mechanism. This makes it impossible to accurately adjust the feeding speed and quantity according to the combustion load, frequently resulting in overfeeding leading to insufficient plasma arc zone temperature, or underfeeding causing torch extinguishing, resulting in poor combustion stability. In addition, the feed pipeline and the burner body are mostly rigidly connected. The vibration generated during equipment operation can easily lead to loosening of the connection and poor sealing. Coal powder leakage and pipeline wear are prominent problems. The overall reliability, service life and operating economy of the equipment are difficult to meet the needs of continuous and efficient industrial production. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of easy coal powder agglomeration, incomplete ignition and combustion, inaccurate control of feed rate and poor combustion stability in existing plasma pulverized coal burners, and to provide a plasma pulverized coal burner component and working method.

[0004] To achieve the above objectives, the present invention employs the following technical solution: A plasma pulverized coal burner assembly includes: a base plate, a burner, a support frame, a hopper, a crushing assembly, and a feeding assembly; The burner is mounted on the base plate; the hopper is positioned above the space of the base plate; and the hopper and the base plate are fixed together by a support frame; the crushing assembly is positioned at the upper end of the hopper and is used to crush agglomerated coal powder; the feeding assembly is positioned at the lower end of the hopper, and the discharge end of the feeding assembly is connected to the feed end of the burner, for stably conveying the crushed coal powder to the burner.

[0005] A further improvement of the present invention is that: Furthermore, the crushing assembly includes a feed frame, crushing rollers, gears, and a drive motor. Two crushing rollers are installed in parallel inside the feed frame. Each crushing roller has a shaft diameter at both ends. The shaft diameters at the same ends of both crushing rollers penetrate the side wall of the feed frame, and the shaft diameters of the crushing rollers are connected to the gears. The two gears mesh with each other to achieve reverse rotation to complete the coal powder crushing. A groove is provided on the other side wall of the feed frame. The shaft diameter at the other end of one crushing roller is located in the groove. The shaft diameter at the other end of the other crushing roller penetrates the side wall of the adjacent feed frame and is connected to the power transmission assembly. A protective box is installed on the side wall of the feed frame. The drive motor is installed inside the protective box. The output end of the drive motor is fixedly connected to one of the crushing rollers, providing power for the rotation of the crushing roller. It also synchronously drives the gear at its end to rotate, thereby driving the other gear and the other crushing roller to rotate in opposite directions through meshing.

[0006] Furthermore, the feeding assembly includes a feeding pipe and a feeding auger, and the power transmission assembly includes a driven sprocket, a driving sprocket, and a chain; the feeding auger is disposed inside the feeding pipe; one end of the feeding auger extends to the outside of the feeding pipe and is connected to the driven sprocket; the shaft diameter of the crushing roller penetrates the side wall of an adjacent feed frame, and the driving sprocket is mounted on the shaft diameter of the crushing roller; the driven sprocket and the driving sprocket are connected by a chain drive.

[0007] Furthermore, a protective cover is fixedly installed on the side of the hopper and the feed frame, and the driving sprocket, driven sprocket and chain are all located inside the protective cover.

[0008] Furthermore, a flexible sealing feed cover is provided at the feed inlet of the burner to seal the connection gap between the feed pipe and the burner.

[0009] Furthermore, the feeding auger includes a central shaft and spiral blades; the bearing of the central shaft is rotatably mounted inside the feeding pipe; the spiral blades are integrally formed on the central shaft at equal intervals and angles along the axial direction of the central shaft; one end of the central shaft is connected to a driven sprocket; the other end of the central shaft is rotatably supported in the groove inside the discharge end of the feeding pipe; the spiral blades are tightly fitted to the inner wall of the feeding pipe to prevent coal powder from accumulating during the conveying process.

[0010] Furthermore, the drive motor is a variable frequency motor, used to adjust the rotation speed to control the operating speed of the crushing roller and gear.

[0011] Furthermore, both crushing rollers are provided with wear-resistant interlocking structures on their surfaces to improve the coal powder crushing efficiency under gear drive.

[0012] Furthermore, the feeding pipe is sealed to the lower end of the hopper to prevent coal powder from leaking from the connection between the hopper and the feeding pipe.

[0013] A method for operating a plasma pulverized coal burner assembly includes: feeding pulverized coal into a feed frame and starting a drive motor; the drive motor drives a crushing roller to rotate, which drives another crushing roller to rotate synchronously in the opposite direction via gears meshing at their ends, thereby crushing agglomerated pulverized coal into uniform pulverized coal particles; as the crushing roller rotates, it drives a drive sprocket at the end of the crushing roller to rotate synchronously; the drive sprocket drives a driven sprocket to rotate via a chain, and the driven sprocket drives a feeding auger of the feeding assembly to rotate synchronously, achieving power linkage between crushing and conveying; the crushed pulverized coal falls from the hopper into a feeding pipe, and the feeding auger continues to rotate and push the pulverized coal; the pulverized coal is conveyed to the outlet through the feeding pipe and enters the burner body through a flexible sealed feeding hood at the burner inlet; the speed of the drive motor is adjusted according to the properties of the pulverized coal and the combustion requirements, and the operating speed of the crushing roller and the feeding auger are controlled synchronously.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention employs a pulverizing assembly consisting of dual pulverizing rollers and meshing gears to pre-pulverize pulverized coal, preventing coal powder agglomeration, resulting in more uniform coal particles, significantly increasing the contact area with the plasma arc zone, and effectively improving ignition efficiency and combustion completeness. A feeding auger structure ensures stable coal powder transport, with a sprocket and chain linkage drive between the pulverizing rollers and the feeding auger, eliminating the need for a separate drive source, simplifying equipment structure, and reducing energy consumption and cost. Protective covers protect transmission components, reducing dust adhesion and wear, and extending service life. A flexible, sealed feeding cover made of high-temperature and wear-resistant corrugated metal hose achieves a flexible, sealed connection, absorbing equipment vibration, preventing pipe loosening or weld cracking, and improving equipment operational reliability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a plasma pulverized coal burner assembly according to the present invention; Figure 2 This is a schematic diagram of the power transmission component structure of the present invention; Figure 3 This is a schematic diagram of the crushing component structure of the present invention; Figure 4 This is a schematic diagram of the feeding assembly structure of the present invention.

[0017] Among them, 1-base plate, 2-burner, 3-support frame, 4-hopper, 5-crushing component, 6-feeding component, 7-feeding frame, 8-crushing roller, 9-gear, 10-protective box, 11-drive motor, 12-feeding pipe, 13-feeding auger, 14-driven sprocket, 15-drive sprocket, 16-chain, 17-protective cover, 18-feeding cover. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and 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, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0024] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 and Figure 2 The present invention discloses a plasma pulverized coal burner assembly, comprising: a base plate 1, a burner 2, a support frame 3, a hopper 4, a crushing assembly 5, and a feeding assembly 6; The burner 2 is mounted on the base plate 1; the hopper 4 is mounted above the space of the base plate 1; and the hopper 4 and the base plate 1 are fixed by a support frame 3; the crushing component 5 is mounted on the upper end of the hopper 4, and the crushing component 5 is used to crush agglomerated coal powder; the feeding component 6 is mounted on the lower end of the hopper 4, and the discharge end of the feeding component 6 is connected to the feed end of the burner 2, and is used to stably transport the crushed coal powder to the burner 2.

[0025] See Figure 3 The crushing assembly 5 includes a feed frame 7, crushing rollers 8, gears 9, and a drive motor 11. Two crushing rollers 8 are installed in parallel inside the feed frame 7. Both ends of the crushing rollers 8 are provided with shaft diameters. The shaft diameters at the same ends of the two crushing rollers 8 penetrate the side wall of the feed frame 7, and the shaft diameters of the crushing rollers 8 are connected to the gears 9. The two gears 9 mesh with each other to achieve reverse rotation to complete the crushing of coal powder. The other side wall of the feed frame 7 is provided with a groove. The shaft diameter at the other end of one crushing roller 8 is set in the groove. The shaft diameter at the other end of the other crushing roller 8 penetrates the side wall of the adjacent feed frame 7 and is connected to the power transmission assembly. A protective box 10 is installed on the side wall of the feed frame 7. The drive motor 11 is installed inside the protective box 10. The output end of the drive motor 11 is fixedly connected to one of the crushing rollers 8 to provide power for the rotation of the crushing roller 8. It also synchronously drives the gear 9 at its end to rotate, thereby driving the other gear 9 to rotate in the opposite direction with the other crushing roller 8 through meshing.

[0026] See Figure 4The feeding assembly 6 includes a feeding pipe 12 and a feeding auger 13. The power transmission assembly includes a driven sprocket 14, a driving sprocket 15, and a chain 16. The feeding auger 13 is disposed inside the feeding pipe 12. One end of the feeding auger 13 extends to the outside of the feeding pipe 12 and is connected to the driven sprocket 14. The shaft diameter of the crushing roller 8 penetrates the side wall of the adjacent feed frame 7, and the driving sprocket 15 is mounted on the shaft diameter of the crushing roller 8. The driven sprocket 14 and the driving sprocket 15 are connected by a chain 16.

[0027] The hopper 4 and the feed frame 7 are jointly and fixedly mounted with a protective cover 17. The driving sprocket 15, the driven sprocket 14 and the chain 16 are all located inside the protective cover 17. A flexible sealing feed cover 18 is provided at the feed inlet of the burner 2 to seal the connection gap between the feed pipe 12 and the burner 2.

[0028] The feeding auger 13 includes a central shaft and spiral blades; the bearing of the central shaft is rotatably installed inside the feeding pipe 12; the spiral blades are integrally formed on the central shaft at equal intervals and angles along the axial direction of the central shaft; one end of the central shaft is connected to a driven sprocket 14; the other end of the central shaft is rotatably supported in the groove inside the discharge end of the feeding pipe 12; the spiral blades are tightly fitted to the inner wall of the feeding pipe 12 to prevent coal powder from accumulating during the conveying process.

[0029] The drive motor 11 is a variable frequency motor, used to adjust the rotation speed to control the operating speed of the crushing roller 8 and the gear 9. Both crushing rollers 8 have wear-resistant meshing structures on their surfaces to improve the coal powder crushing efficiency driven by the gear 9. The feeding pipe 12 is sealed to the lower end of the hopper 4 to prevent coal powder from leaking from the connection between the hopper 4 and the feeding pipe 12.

[0030] A method for operating a plasma pulverized coal burner assembly includes: feeding pulverized coal into a feed frame 7 and starting a drive motor 11; the drive motor 11 drives one crushing roller 8 to rotate, and the crushing roller 8 drives another crushing roller 8 to rotate synchronously in the opposite direction through gears 9 meshing at their ends, thereby crushing agglomerated pulverized coal into uniform pulverized coal particles; when the crushing roller 8 rotates, it drives the drive sprocket 15 at the end of the crushing roller 8 to rotate synchronously; the drive sprocket 15 drives the driven sprocket 14 to rotate through a chain 16, and the driven sprocket 14 drives the feeding auger 13 of the feeding assembly 6 to operate synchronously, thereby achieving crushing and... The conveying power is linked; the crushed coal powder falls from the hopper 4 into the feeding pipe 12, and the feeding auger 13 continuously rotates to push the coal powder; the coal powder is conveyed to the outlet through the feeding pipe 12, and enters the burner body 2 through the flexible sealed feeding cover 18 at the feed inlet of the burner 2; according to the coal powder properties and combustion requirements, the speed of the drive motor 11 is adjusted to synchronously control the running speed of the crushing roller 8 and the feeding auger 13 to match the crushing and conveying efficiency; the wear-resistant interlocking structure set on the roller surface of the two crushing rollers 8, the gear 9 drives the two crushing rollers 8 to rotate, and the coal powder is squeezed and ground by relying on the roller surface interlocking structure.

[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A plasma pulverized coal burner assembly, characterized in that, include: The base plate (1), burner (2), support frame (3), hopper (4), crushing assembly (5) and feeding assembly (6); The burner (2) is mounted on the base plate (1); the hopper (4) is mounted above the space of the base plate (1); and the hopper (4) and the base plate (1) are fixed by a support frame (3); the crushing component (5) is mounted on the upper end of the hopper (4), and the crushing component (5) is used to crush agglomerated coal powder; the feeding component (6) is mounted on the lower end of the hopper (4), and the discharge end of the feeding component (6) is connected to the feed end of the burner (2), and is used to stably transport the crushed coal powder to the burner (2).

2. The plasma pulverized coal burner assembly according to claim 1, characterized in that, The crushing assembly (5) includes a feed frame (7), crushing rollers (8), gears (9), and a drive motor (11). Two crushing rollers (8) are installed in parallel inside the feed frame (7). Both ends of the crushing rollers (8) are provided with shaft diameters. The shaft diameters at the same ends of the two crushing rollers (8) penetrate the side wall of the feed frame (7), and the shaft diameters of the crushing rollers (8) are connected to the gears (9). The two gears (9) mesh with each other to achieve reverse rotation to complete the crushing of coal powder. The other side wall of the feed frame (7) is provided with a groove. The other end of one of the crushing rollers (8) The shaft diameter is set in the groove; the shaft diameter of the other end of the other crushing roller (8) passes through the side wall of the adjacent feed frame (7) and is connected to the power transmission assembly; a protective box (10) is installed on the side wall of the feed frame (7), and the drive motor (11) is installed inside the protective box (10). The output end of the drive motor (11) is fixedly connected to one of the crushing rollers (8) to provide power for the rotation of the crushing roller (8); and synchronously drives the gear (9) at its end to rotate, thereby driving the other gear (9) to rotate in the opposite direction to the other crushing roller (8) through meshing.

3. A plasma pulverized coal burner assembly according to claim 2, characterized in that, The feeding assembly (6) includes a feeding pipe (12) and a feeding auger (13). The power transmission assembly includes a driven sprocket (14), a driving sprocket (15), and a chain (16). The feeding auger (13) is disposed inside the feeding pipe (12). One end of the feeding auger (13) extends to the outside of the feeding pipe (12) and is connected to the driven sprocket (14). The shaft diameter of the crushing roller (8) passes through the side wall of the adjacent feed frame (7), and the driving sprocket (15) is mounted on the shaft diameter of the crushing roller (8). The driven sprocket (14) and the driving sprocket (15) are connected by a chain (16).

4. A plasma pulverized coal burner assembly according to claim 3, characterized in that, The hopper (4) and the feed frame (7) are together fixedly installed with a protective cover (17), and the driving sprocket (15), driven sprocket (14) and chain (16) are all located inside the protective cover (17).

5. A plasma pulverized coal burner assembly according to claim 4, characterized in that, A flexible sealing feed cover (18) is provided at the feed inlet of the burner (2) to seal the connection gap between the feed pipe (12) and the burner (2).

6. A plasma pulverized coal burner assembly according to claim 5, characterized in that, The feeding auger (13) includes a central shaft and spiral blades; the bearing of the central shaft is rotatably installed inside the feeding pipe (12); the spiral blades are integrally formed on the central shaft at equal intervals and angles along the axial direction of the central shaft; one end of the central shaft is connected to a driven sprocket (14); the other end of the central shaft is rotatably supported in the groove inside the discharge end of the feeding pipe (12); the spiral blades are tightly fitted to the inner wall of the feeding pipe (12) to prevent coal powder from accumulating during the conveying process.

7. A plasma pulverized coal burner assembly according to claim 6, characterized in that, The drive motor (11) is a variable frequency motor, used to adjust the rotation speed to control the operating speed of the crushing roller (8) and the gear (9).

8. A plasma pulverized coal burner assembly according to claim 7, characterized in that, The roller surfaces of the two crushing rollers (8) are provided with wear-resistant interlocking structures to improve the coal powder crushing efficiency driven by the gear (9).

9. A plasma pulverized coal burner assembly according to claim 8, characterized in that, The feeding pipe (12) is sealed to the lower end of the hopper (4) to prevent coal powder from leaking from the connection between the hopper (4) and the feeding pipe (12).

10. A method for operating a plasma pulverized coal burner assembly according to claim 9, characterized in that, include: Coal powder is fed into the feed frame (7), and the drive motor (11) is started. The drive motor (11) drives one crushing roller (8) to rotate. The crushing roller (8) drives another crushing roller (8) to rotate synchronously in the opposite direction through gears (9) meshing at their ends, thus breaking up the agglomerated coal powder and forming uniform coal powder particles. When the crushing roller (8) rotates, it drives the drive sprocket (15) at the end of the crushing roller (8) to rotate synchronously. The drive sprocket (15) drives the driven sprocket (14) to rotate through the chain (16). The feeding auger (13) of the drive feeding assembly (6) operates synchronously to achieve power linkage between crushing and conveying; the crushed coal powder falls from the hopper (4) into the feeding pipe (12), and the feeding auger (13) continuously rotates to push the coal powder; the coal powder is conveyed to the outlet through the feeding pipe (12) and enters the burner body (2) through the flexible sealed feeding cover (18) at the feed inlet of the burner (2); according to the coal powder properties and combustion requirements, the speed of the drive motor (11) is adjusted to synchronously control the operating speed of the crushing roller (8) and the feeding auger (13).

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