A pulverized coal feeding device for a pulverized coal injection machine

Abstract

This utility model relates to the field of pulverized coal injection machine technology and discloses a pulverized coal injection machine feeding device, including a base plate, a shock-absorbing bracket fixedly installed on the base plate, and a dual-outlet pneumatic feeder fixedly installed on one side of the base plate. The dual-outlet pneumatic feeder contains an impeller. This pulverized coal injection machine feeding device uses a single power source (a fan controlled by a frequency converter) to drive feeding, grinding, and injection. Compared to traditional pulverized coal injection machines with multiple power sources, energy consumption can be reduced by more than 35%, effectively reducing production costs. Simultaneously, the simplified structure reduces the number of components, making installation simpler and troubleshooting easier during maintenance, shortening maintenance time by 80%. This reduces downtime due to maintenance, improves production efficiency, and ensures that the fan speed matches the grinding speed, making the grinding process more stable and improving the uniformity of injection, which is beneficial for the complete combustion of fuels such as coal and improves combustion efficiency.

Description

Technical Field

[0001] This utility model relates to the field of pulverized coal injection machine technology, specifically a pulverized coal injection machine powder feeding device. Background Technology

[0002] In the industrial production field, coal-fired power plants are commonly used to grind solid fuels such as coal into powder and then transport it to combustion equipment by wind power to achieve efficient combustion. They are widely used in heat supply equipment such as boilers and kilns.

[0003] Traditional pulverized coal injection machines generally adopt a split-type structure design. However, this design results in a large overall structure of equipment. The various units need to be connected through complex pipelines and mechanical transmission components, which occupies a lot of installation space. At the same time, the primary crushing, secondary grinding, and pneumatic conveying all use independent power systems, resulting in high energy consumption and high equipment operating costs. Moreover, the multi-stage structure increases the number of failure points. If a unit fails, the maintenance is difficult and may cause the entire pulverized coal injection machine to shut down, affecting the continuity of production. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a pulverized coal feeding device for a pulverized coal injection machine. This addresses the issues mentioned in the background section, where traditional pulverized coal injection machines typically employ a split-type structure design. However, this design results in a large overall equipment structure, requiring complex piping and mechanical transmission components to connect various devices, thus occupying significant installation space. Furthermore, the primary crushing, secondary grinding, and pneumatic conveying all utilize independent power systems, leading to high energy consumption and operating costs. Moreover, the multi-stage structure increases the number of potential failure points; a malfunction in any stage device makes repair difficult and can cause the entire pulverized coal injection machine to shut down, disrupting production continuity.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pulverized coal injection machine feeding device, comprising a base plate, a shock-absorbing bracket fixedly installed on the base plate, a dual-outlet pneumatic feeder fixedly installed on one side of the base plate, an impeller disposed inside the dual-outlet pneumatic feeder, an integrated grinder disposed on one side of the dual-outlet pneumatic feeder, a auger feeding pipe fixedly installed on the right side of the integrated grinder, a hopper installed at the top of the auger feeding pipe, an auger speed regulator fixedly installed on the left side of the auger feeding pipe, an auger feeder fixedly installed at the output end of the auger speed regulator, the auger feeder extending into the auger feeding pipe, and a makeup air inlet disposed on one side of the auger feeding pipe.

[0006] Using the above technical solution, the material is fed into the hopper and then into the auger feeding pipe. The operator can adjust the speed of the auger speed controller according to production needs, thereby driving the auger feeder installed at its output end to rotate, thus conveying the material along the auger feeding pipe to the integrated grinder. During the material conveying process, the operator supplements air through the air inlet on the auger feeding pipe, allowing the material to smoothly enter the integrated grinder under the propulsion of the airflow. The material entering the integrated grinder is then ground by the forward and reverse grinding discs. After grinding, the material is screened by a screening device. Coal powder of the qualified particle size enters the dual-outlet pneumatic feeder through the discharge port of the integrated grinder. The impeller of the dual-outlet pneumatic feeder rotates at high speed under the drive of the drive motor, generating suction to draw in the coal powder, which is then ejected from the two outlets through the outlet nozzles.

[0007] Preferably, the shock absorber bracket is provided with a shock absorber coupling, and a drive motor is fixedly installed on the shock absorber bracket. The output end of the drive motor is connected to the shock absorber coupling, and the shock absorber coupling is connected to the impeller.

[0008] Using the above technical solution, the impeller of the dual-outlet pneumatic feeder rotates at high speed under the drive of the drive motor, generating suction to draw in pulverized coal, which is then ejected from the two outlets through the outlet nozzles to be transported into the combustion equipment. The shock-absorbing coupling then plays a buffering and damping role, reducing the impact of vibration generated by the drive motor during operation on the dual-outlet pneumatic feeder, thereby improving the stability of equipment operation.

[0009] Preferably, both ends of the dual-outlet pneumatic feeder are provided with outlet nozzles, the outlet nozzles are designed with a tapered structure, the dual-outlet pneumatic feeder is provided with a perforated plate, and the dual-outlet pneumatic feeder is provided with a collector.

[0010] Using the above technical solution, qualified coal powder will pass through the screen and enter the collector, and finally be sprayed out through the outlet nozzle. Because the outlet nozzle has a tapered structure, the coal powder can be sprayed out at a certain speed and angle, thereby ensuring that the coal powder can smoothly enter the combustion equipment.

[0011] Preferably, the integrated grinding machine has a fixed grinding disc inside, on which a forward grinding toothed disc and a reverse grinding toothed disc are installed. The fixed grinding disc is connected to a connecting shaft on the impeller. The integrated grinding machine is equipped with a screen, and the diameter of the mesh openings on the screen is 50 μm.

[0012] Using the above technical solution, the impellers of the dual-outlet pneumatic feeder are coaxially arranged. Therefore, when the dual-outlet pneumatic feeder is running, it will drive the forward grinding toothed disc and the reverse grinding toothed disc inside the integrated grinder to rotate, thereby grinding the material entering the integrated grinder. At the same time, the grinder is also equipped with a screen with a mesh diameter of 50um, so that coal powder of qualified particle size can be screened out, and unqualified coal powder continues to remain in the grinder for grinding. Finally, qualified coal powder will pass through the screen into the collector and finally be sprayed out through the outlet nozzle.

[0013] Preferably, the shock-absorbing bracket is provided with a protective cover, and the protective cover has heat dissipation holes.

[0014] By adopting the above technical solution, the protective cover set on the shock-absorbing bracket can protect the shock-absorbing coupling, and the heat dissipation holes on the protective cover can dissipate the heat generated by the shock-absorbing coupling.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This pulverized coal injection machine's feeding device uses a single power source (a fan controlled by a frequency converter) to drive feeding, grinding, and injection. Compared to traditional pulverized coal injection machines with multiple power sources, energy consumption can be reduced by more than 35%, effectively reducing production costs. At the same time, the simplified structure reduces the number of parts, making installation simpler and troubleshooting easier during maintenance. Maintenance time can be shortened by 80%, reducing downtime caused by maintenance and improving production efficiency. Moreover, the fan speed is consistent with the grinding speed, making the grinding process more stable and improving the uniformity of injection, which is conducive to the complete combustion of fuels such as coal and improves combustion efficiency. Compared with traditional pulverized coal injection machines, combustion efficiency can be increased by more than 20%.

[0017] 2. The coal injection machine's feeding device uses a dual-outlet pneumatic feeder with coaxial impellers. When the dual-outlet pneumatic feeder operates, it drives the forward and reverse grinding toothed discs inside the integrated grinder to rotate, thus grinding the material entering the integrated grinder. The grinder also has a screen with a mesh diameter of 50µm, which can screen out coal powder of the correct particle size. Unqualified coal powder continues to be ground inside the grinder, and finally, the qualified coal powder passes through the screen into the collector and is ejected through the outlet nozzle. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the coal injection machine feeding device of this utility model;

[0019] Figure 2This is a side view of the coal injection machine feeding device of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the pulverized coal feeding device of the present invention;

[0021] Figure 4 This is a schematic diagram of the integrated grinding machine and its related structures according to the present invention.

[0022] In the diagram: 1. Base plate; 2. Vibration damping bracket; 3. Dual-outlet pneumatic feeder; 4. Integrated grinding mill; 5. Screw feeder pipe; 6. Hopper; 7. Screw speed controller; 8. Screw feeder; 9. Air inlet; 10. Vibration damping coupling; 11. Drive motor; 12. Outlet nozzle; 13. Mesh plate; 14. Collector; 15. Forward grinding moving toothed disc; 16. Reverse grinding moving toothed disc; 17. Screen; 18. Protective cover. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1:

[0025] Referring to Figures 1-4, a pulverized coal injection machine feeding device is described. A shock-absorbing bracket 2 is fixedly installed on the base plate 1. A dual-outlet pneumatic feeder 3 is fixedly installed on one side of the base plate 1. An impeller is installed inside the dual-outlet pneumatic feeder 3. An integrated grinding mill 4 is installed on one side of the dual-outlet pneumatic feeder 3. A auger feeding pipe 5 is fixedly installed on the right side of the integrated grinding mill 4. A hopper 6 is installed at the top of the auger feeding pipe 5. An auger speed regulator is fixedly installed on the left side of the auger feeding pipe 5. 7. A auger feeder 8 is fixedly installed at the output end of the auger speed controller 7. The auger feeder 8 extends into the auger feeding pipe 5. An air inlet 9 is provided on one side end face of the auger feeding pipe 5. A shock-absorbing coupling 10 is provided on the shock-absorbing bracket 2. A drive motor 11 is fixedly installed on the shock-absorbing bracket 2. The output end of the drive motor 11 is connected to the shock-absorbing coupling 10. The shock-absorbing coupling 10 is connected to the impeller. A protective cover 18 is provided on the shock-absorbing bracket 2. The protective cover 18 has heat dissipation holes.

[0026] Working Principle: The worker feeds material into hopper 6, which then enters the auger feeding pipe 5. The worker adjusts the speed of the auger speed controller 7 according to production needs, thereby rotating the auger feeder 8 installed at its output end. This transports the material along the auger feeding pipe 5 to the integrated grinder 4. During material transport, air is supplied through the air inlet 9 on the auger feeding pipe 5, allowing the material to smoothly enter the integrated grinder 4 under the propulsion of the airflow. The material entering the integrated grinder 4 is then ground by the forward grinding toothed disc 15 and the reverse grinding toothed disc 16. After grinding, the material is screened by a screening device. Coal powder of qualified particle size enters the dual-outlet pneumatic feeder 3 through the outlet of the integrated grinder 4. The impeller of the dual-outlet pneumatic feeder 3 rotates at high speed under the drive of the drive motor 11, generating suction to draw in the coal powder, which is then ejected from the two outlets through the outlet nozzles 12. The material is conveyed to the combustion equipment. The air inlet 9 on the auger feed pipe 5 replenishes air, ensuring sufficient airflow during conveying and grinding to prevent blockage. The vibration damping coupling 10 buffers and reduces vibration, minimizing the impact of vibrations from the drive motor 11 on the dual-outlet pneumatic feeder 3, thus improving equipment stability. The protective cover 18 on the vibration damping bracket 2 protects the vibration damping coupling 10, and its ventilation holes dissipate heat. The vibration damping bracket 2 on the base plate 1 consists of rubber damping pads and a metal bracket. The metal bracket is fixed to the pulverized coal machine frame, and the rubber damping pads are placed between the drive motor 11 and the metal bracket to absorb vibrations from the drive motor 11, reducing operating noise. This device uses a single-power-source frequency converter-controlled fan to drive feeding, grinding, and spraying, reducing energy consumption by 35% compared to traditional pulverized coal machines with multiple power sources. The above effectively reduces production costs. At the same time, the simplified structure reduces the number of parts, making the installation process simpler and the troubleshooting process easier. Maintenance time can be shortened by 80%, reducing downtime caused by equipment maintenance and improving production efficiency. Moreover, the fan speed is consistent with the grinding speed, making the grinding process more stable and improving the uniformity of material spraying, which is conducive to the full combustion of fuels such as coal and improves combustion efficiency. Compared with traditional coal injection machines, the combustion efficiency can be improved by more than 20%.

[0027] Example 2:

[0028] Referring to Figures 1-4, a pulverized coal injection machine feeding device is described. The dual-outlet pneumatic feeder 3 has outlet nozzles 12 at both ends, each nozzle having a tapered design. A perforated plate 13 and a collector 14 are installed inside the dual-outlet pneumatic feeder 3. A fixed grinding disc is installed inside the integrated grinding mill 4, on which a forward grinding toothed disc 15 and a reverse grinding toothed disc 16 are mounted. The fixed grinding disc is connected to a connecting shaft on the impeller. A screen 17 with 50µm diameter mesh openings is installed inside the integrated grinding mill 4.

[0029] Working principle: The impellers of the dual-outlet pneumatic feeder 3 are coaxially arranged. Therefore, when the dual-outlet pneumatic feeder 3 is running, it will drive the forward grinding toothed disc 15 and the reverse grinding toothed disc 16 in the integrated grinder 4 to rotate, thereby grinding the material entering the integrated grinder 4. At the same time, the grinder is also equipped with a screen 17 with a mesh diameter of 50um, so that coal powder of qualified particle size can be screened out, so that unqualified coal powder continues to be ground in the grinder. Finally, qualified coal powder will pass through the screen 17 into the collector 14 and finally be sprayed out through the outlet nozzle 12. Because the outlet nozzle 12 has a tapered structure, it can spray the coal powder at a certain speed and angle, thereby ensuring that the coal powder can smoothly enter the combustion equipment.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pulverized coal feeding device for a pulverized coal injection machine, comprising a base plate (1), characterized in that: A shock-absorbing bracket (2) is fixedly installed on the base plate (1). A double-outlet pneumatic feeder (3) is fixedly installed on one side of the base plate (1). An impeller is provided inside the double-outlet pneumatic feeder (3). An integrated grinding machine (4) is provided on one side of the double-outlet pneumatic feeder (3). A auger feeding pipe (5) is fixedly installed on the right side of the integrated grinding machine (4). A hopper (6) is installed at the top of the auger feeding pipe (5). An auger speed controller (7) is fixedly installed on the left side of the auger feeding pipe (5). An auger feeder (8) is fixedly installed at the output end of the auger speed controller (7). The auger feeder (8) extends into the auger feeding pipe (5). An air inlet (9) is provided on one side of the auger feeding pipe (5).

2. The pulverized coal feeding device for a pulverized coal injection machine according to claim 1, characterized in that: The shock-absorbing bracket (2) is provided with a shock-absorbing coupling (10), and a drive motor (11) is fixedly installed on the shock-absorbing bracket (2). The output end of the drive motor (11) is connected to the shock-absorbing coupling (10), and the shock-absorbing coupling (10) is connected to the impeller.

3. The pulverized coal feeding device for a pulverized coal injection machine according to claim 1, characterized in that: Both ends of the dual-outlet pneumatic feeder (3) are provided with outlet nozzles (12), the outlet nozzles (12) are designed with a tapered structure, the dual-outlet pneumatic feeder (3) is provided with a mesh plate (13), and the dual-outlet pneumatic feeder (3) is provided with a collector (14).

4. The pulverized coal feeding device for a pulverized coal injection machine according to claim 1, characterized in that: The integrated grinding machine (4) is equipped with a fixed grinding disc inside. The fixed grinding disc is equipped with a forward grinding moving toothed disc (15) and a reverse grinding moving toothed disc (16). The fixed grinding disc is connected to the connecting shaft on the impeller. The integrated grinding machine (4) is equipped with a screen (17). The diameter of the mesh opening on the screen (17) is 50um.

5. A pulverized coal feeding device for a pulverized coal injection machine according to claim 1, characterized in that: The shock-absorbing bracket (2) is provided with a protective cover (18) and heat dissipation holes are provided on the protective cover (18).

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