Pulverized coal treatment device for power plant

Abstract

The pulverized coal treatment device comprises an equipment base, screening equipment is arranged above the equipment base, a feeding opening is formed in the upper surface of the screening equipment, screens are arranged on the inner wall of the screening equipment in an up-down parallel mode, and a discharging pipe opening is fixedly formed in the bottom of the front end face of the screening equipment; grinding equipment is arranged above the screening equipment, and a discharging opening is fixedly formed in the bottom end of the grinding equipment; by means of the linkage design of the conveying mechanism, the grinding device and the screening device, large-particle coal briquettes intercepted by a screen are automatically sent back to the grinding device for secondary machining, manual collection of returned materials is not needed, the labor intensity of workers is reduced, and compared with the prior art, the pulverized coal production efficiency is improved; the grinding, screening and automatic material returning functions are integrated, the discharging port of the grinding equipment is connected with the feeding port of the screening equipment in an embedded mode, the material conveying path is compact, material losses are reduced, the conveying time is shortened, and the overall treatment efficiency is further improved.

Description

Technical Field

[0001] This invention relates to solid screening technology, specifically to a coal powder processing device for power plants. Background Technology

[0002] Pulverized coal is a fine powdered fuel made from raw coal through crushing, grinding, and other processes. Its particle size is typically required to be controlled within a certain range (most power plants require 70%-80% of particles smaller than 0.075mm). It features a large specific surface area and high combustion efficiency, making it the core energy source for boiler combustion in thermal power plants. Existing pulverized coal processing procedures in power plants mainly include raw coal pretreatment, grinding and crushing, screening and grading, and storage and transportation. Screening and grading is one of the key processes; screening equipment separates large, substandard coal particles, ensuring that the final pulverized coal particle size meets boiler combustion requirements and preventing incomplete combustion, coking, or reduced heat transfer efficiency after large particles enter the furnace.

[0003] However, in existing power plant pulverized coal processing screening equipment, due to the stringent particle size requirements of pulverized coal, the screen mesh size used for screening is generally small (usually 0.1-0.5mm), and the screen structure is fine. During the screening process, a large number of incompletely ground large coal particles are intercepted and discharged by the screen. These large coal particles need to be manually collected and poured back into the grinder for secondary or even multiple grinding. After grinding, they are sent back to the screening equipment for screening again until the particle size meets the standard. This repetitive operation mode of "screening, returning, re-grinding, and re-screening" not only increases the labor intensity of the staff, but also makes the pulverized coal processing process relatively slow, extends the operation cycle, seriously affects the overall production efficiency of pulverized coal, and is difficult to adapt to the continuous and efficient production needs of power plants. Summary of the Invention

[0004] The purpose of this invention is to provide a coal powder processing device for power plants, in order to solve the problem in the prior art that large coal particles that do not meet the standards need to be manually collected and re-processed in a grinding mill during coal powder screening, resulting in high labor intensity for workers and low coal powder production efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a coal powder treatment device for power plants, comprising an equipment base, a screening device arranged above the equipment base, a feed inlet on the upper surface of the screening device, screens arranged side by side on the inner wall of the screening device, and a discharge pipe fixedly installed at the bottom of the front end face of the screening device.

[0006] A grinding device is installed above the screening equipment. A discharge port is fixedly installed at the bottom of the grinding device. A filler pipe is installed at the middle of the top of the grinding device. An equipment support is fixedly installed on the outer surface of the grinding device. A conveying mechanism is installed on the outer surface of the screening equipment for returning the material in the screening equipment to the grinding device for further processing.

[0007] The conveying mechanism includes a connecting pipe port, which is fixedly installed on one side of the inner wall of the screening equipment near the top of the screen. A conveying pipe is fixedly installed on the outside of the connecting pipe port. Support shafts are rotatably installed at the upper and lower ends of the inner wall of the conveying pipe. A spiral conveying frame is fixedly installed on the outer surface of the support shaft. A second driving part is provided on the lower bottom surface of the support shaft outside the conveying pipe. A guide pipe is fixedly installed on the top of one side of the inner wall of the conveying pipe into the grinding equipment.

[0008] The grinding equipment is also equipped with a grinding mechanism inside, which is used to grind larger coal particles into powder.

[0009] Furthermore, the grinding mechanism includes a grinding roller, which is rotatably installed at the middle of both ends of the inner wall of the grinding equipment. Several grinding parts are fixedly installed on the outer surface of the grinding roller. A third driving part is provided at the middle of one end of the grinding roller extending to the outside of the grinding equipment. A support plate is fixedly installed on the inner wall of the grinding equipment near the grinding roller. A filter screen is provided at the middle position of the support plate.

[0010] Furthermore, the filter screen has an arc-shaped cross-section, the bottom of the outer surface of the grinding roller is located inside the filter screen, and the grinding roller and the filter screen are coupled to each other.

[0011] Furthermore, the outer diameter of the discharge port is smaller than the inner diameter of the opening at the top of the inlet, one end of the discharge port extends into the interior of the inlet, and the inlet and discharge port are interlocked.

[0012] Furthermore, a dustproof bag is provided at the junction of the inlet and outlet. The top and bottom of the outer surface of the dustproof bag are tied with straps, which are respectively located at the top of the outlet and the opening on the outer surface of the inlet.

[0013] Furthermore, a plurality of connecting springs are provided on the edge of the upper surface of the equipment base, the top of the connecting springs are fixed to the bottom of the outer surface of the screening equipment, and a first driving part is provided at the bottom of the inner wall of the equipment base, the output end of the upper surface of the first driving part is connected to the middle of the bottom of the screening equipment.

[0014] Furthermore, the top of both the screen and the inner wall of the screening equipment are set as a cone structure, and a horizontal connecting plate is set at the junction of the edge of the screen and the inner wall of the screening equipment. The bottom of the inner wall of the connecting pipe is flush with the horizontal connecting plate.

[0015] Furthermore, the discharge port and multiple connecting ports are equidistantly distributed along the outer surface of the screening equipment, and the bottom surface of the second drive unit is fixed to the horizontal support of the equipment bracket.

[0016] Compared with the prior art, the pulverized coal treatment device for power plants provided by the present invention has the following beneficial effects:

[0017] 1. This invention, through the linkage design of the conveying mechanism with the grinding and screening equipment, automatically returns large coal particles intercepted by the screen to the grinding equipment for secondary processing, eliminating the need for manual collection of returned materials, reducing the labor intensity of workers, and improving the coal powder production efficiency compared with the prior art.

[0018] 2. This invention integrates grinding, screening, and automatic return functions into one unit. The discharge port of the grinding equipment and the inlet of the screening equipment are connected in an interlocking manner, resulting in a compact material transmission path, reducing material loss and transmission time, and further improving the overall processing efficiency.

[0019] 3. This invention seals the junction of the inlet and outlet with a dustproof bag, effectively preventing coal dust leakage, protecting the working environment, avoiding dust waste, and improving the environmental friendliness of the equipment.

[0020] 4. This invention uses parallel screens with vibration drive. The conical screen structure facilitates material flow and large particle collection. The connecting pipe is flush with the horizontal connecting plate to ensure that large particles are collected without residue, which improves the thoroughness of screening and reduces the number of repeated screenings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of the screening equipment provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the delivery pipe provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic cross-sectional view of the grinding equipment provided in an embodiment of the present invention;

[0026] Figure 5This is a schematic diagram of the cross-sectional structure of the dustproof bag provided in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the discharge pipe structure provided in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Equipment base; 2. Screening equipment; 3. Feed inlet; 4. Screen; 5. Connecting spring; 6. First drive unit; 7. Discharge port; 8. Grinding equipment; 9. Discharge port; 10. Filler port; 11. Equipment support; 12. Connecting port; 13. Conveying pipe; 14. Support shaft; 15. Screw conveyor frame; 16. Second drive unit; 17. Guide pipe fittings; 18. Grinding roller; 19. Grinding parts; 20. Third drive unit; 21. Support plate; 22. Filter screen; 23. Dustproof bag; 24. Binding strap. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] As attached Figure 1 To be continued Figure 6 As shown:

[0032] Example 1:

[0033] This invention provides a coal powder treatment device for power plants, including a base 1, a screening device 2 arranged above the base 1, a feed inlet 3 on the upper surface of the screening device 2, screens 4 arranged side by side on the inner wall of the screening device 2, the top of the screens 4 and the inner wall of the screening device 2 are both set as conical structures, a horizontal connecting plate is set at the junction of the edge of the screens 4 and the inner wall of the screening device 2, the bottom end of the inner wall of the connecting pipe 12 is flush with the horizontal connecting plate, and a discharge pipe 7 is fixedly installed at the bottom of the front end face of the screening device 2.

[0034] A number of connecting springs 5 ​​are provided on the edge of the upper surface of the equipment base 1. The top of the connecting springs 5 ​​is fixed to the bottom of the outer surface of the screening equipment 2. A first drive part 6 is provided at the bottom of the inner wall of the equipment base 1. The first drive part 6 is a vibrating motor. The output end of the upper surface of the first drive part 6 is connected to the middle of the bottom of the screening equipment 2.

[0035] A grinding device 8 is installed above the screening device 2. A discharge port 9 is fixedly installed at the bottom of the grinding device 8. A filler pipe port 10 is installed at the middle of the top of the grinding device 8. An equipment support 11 is fixedly installed on the outer surface of the grinding device 8. A conveying mechanism is installed on the outer surface of the screening device 2 to send the material in the screening device 2 back to the grinding device 8 for further processing.

[0036] The conveying mechanism includes a connecting pipe 12, which is fixedly installed on one side of the inner wall of the screening equipment 2 near the screen 4. A conveying pipe 13 is fixedly installed on the outside of the connecting pipe 12. Support shafts 14 are rotatably installed at the upper and lower ends of the inner wall of the conveying pipe 13. A spiral conveying frame 15 is fixedly installed on the outer surface of the support shaft 14. A second drive unit 16 is provided on the bottom surface of the support shaft 14 outside the conveying pipe 13. The second drive unit 16 is a first drive motor. A guide pipe 17 is fixedly installed on the top of one side of the inner wall of the conveying pipe 13 into the grinding equipment 8.

[0037] The discharge port 7 and multiple connecting ports 12 are equidistantly distributed along the outer surface of the screening equipment 2, and the bottom surface of the second drive unit 16 is fixed to the horizontal support of the equipment support 11.

[0038] The grinding equipment 8 is also equipped with a grinding mechanism inside, which is used to grind larger coal particles into powder.

[0039] Working principle: First, the staff completes the equipment inspection before operation, confirming that the connecting spring 5 is not deformed and has good elasticity, the screen 4 is not damaged and is installed firmly, the conveying pipe 13 is welded tightly to the connecting pipe port 12 without looseness, the spiral conveyor frame 15 rotates flexibly around the support shaft 14, and the wiring of the first drive unit 6 and the second drive unit 16 is normal and there is no abnormal noise during operation.

[0040] Next, the staff adds the raw coal block to be processed through the filler pipe 10 at the top of the grinding equipment 8, and starts the third drive unit 20 to drive the grinding mechanism. The coal powder formed after the raw coal block is ground is discharged through the discharge port 9. Since the discharge port 9 and the feed port 3 are interlocked, the coal powder falls accurately into the screening equipment 2, avoiding spillage and material loss.

[0041] Then, the staff started the first drive unit 6, which drove the screening equipment 2 to generate high-frequency vibration. The connecting spring 5 extended and retracted synchronously to buffer the impact of vibration on the equipment base 1 and reduce operating noise. The screen 4 on the inner wall of the screening equipment 2 vibrated synchronously with the equipment. The cone-shaped screen 4 facilitated the flow of materials to the edge. Large coal particles gathered at the horizontal connecting plate under the action of vibration, while qualified coal powder passed through the screen 4 and was evenly discharged from the equidistantly distributed discharge pipes 7 to enter the subsequent storage stage.

[0042] At this time, the staff starts the second drive unit 16, which drives the support shaft 14 to rotate. The spiral conveyor frame 15 rotates synchronously, conveying the large coal particles collected by the connecting pipe 12 upward. The connecting pipe 12 is flush with the horizontal connecting plate to ensure that no large particles are left in the conveying pipe 13. The coal particles fall accurately into the grinding equipment 8 through the guide pipe 17 for grinding again without manual intervention.

[0043] After the operation is completed, the staff first closes the feed at the filling pipe 10 and keeps the equipment running for five minutes to completely process the residual material. Then, the third drive unit 20, the first drive unit 6, and the second drive unit 16 are closed in sequence. The residual coal powder at the discharge pipe 7 and the guide pipe 17 is cleaned, and the status of each component is checked to ensure normal operation in the next operation.

[0044] Example 2:

[0045] This embodiment is basically the same as the previous embodiment, except that the grinding mechanism includes a grinding roller 18, which is rotatably installed at the middle of the front and rear ends of the inner wall of the grinding equipment 8. Several grinding parts 19 are fixedly installed on the outer surface of the grinding roller 18. A third drive unit 20 is provided at the middle of one end of the grinding roller 18 extending to the outside of the grinding equipment 8. The third drive unit 20 is a No. 2 drive motor. A support plate 21 is fixedly installed on the inner wall of the grinding equipment 8 near the grinding roller 18. A filter screen 22 is provided at the middle position of the support plate 21.

[0046] The filter screen 22 has an arc-shaped cross-section, and the bottom of the outer surface of the grinding roller 18 is located inside the filter screen 22. The grinding roller 18 and the filter screen 22 are coupled to each other.

[0047] Working principle: First, before starting work, the staff checks the status of the grinding mechanism to confirm that the grinding roller 18 rotates smoothly, the grinding parts 19 are not worn or detached, the coupling gap between the arc-shaped filter screen 22 and the grinding roller 18 is uniform, the support plate 21 is firmly fixed without loosening, and the output speed of the third drive unit 20 is stable.

[0048] Next, the staff adjusts the output speed of the third drive unit 20 according to the hardness of the raw coal: the raw coal with greater hardness is adjusted to the low speed (30r / min), and the raw coal with less hardness is adjusted to the high speed (50r / min); the raw coal is added through the filler pipe 10, and the raw coal falls into the grinding equipment 8, where it comes into contact with the rotating grinding roller 18, and the grinding parts 19 squeeze, shear and crush the raw coal.

[0049] Then, the arc-shaped filter screen 22 restricts the movement range of the raw coal blocks, allowing the coal blocks to fully contact the grinding parts 19 and improving the grinding uniformity. After preliminary grinding, coal powder with a particle size smaller than the aperture of the filter screen 22 passes through the filter screen 22 and falls into the discharge port 9, entering the screening equipment 2. Large coal particles that do not pass through the filter screen 22 remain between the grinding roller 18 and the filter screen 22 and continue to be repeatedly ground until they meet the standards.

[0050] The screening equipment 2 starts vibrating screening simultaneously. The qualified coal powder is discharged from the discharge pipe 7, and the unqualified large particles are sent back to the top of the grinding equipment 8 by the conveying mechanism. They are mixed with the newly added raw coal blocks and then enter the grinding stage. During the grinding process, the support plate 21 provides stable support for the filter screen 22 to prevent the filter screen from deforming due to grinding pressure and to ensure that the grinding accuracy is always consistent.

[0051] After the operation is completed, the staff will turn off the third drive unit 20. After the grinding roller 18 stops rotating, they will clean any large particles that may remain on the surface of the filter screen 22, check the wear of the grinding parts 19, and replace them if necessary to ensure the subsequent grinding effect.

[0052] Example 3:

[0053] This embodiment is basically the same as the previous embodiment, except that the outer diameter of the discharge port 9 is smaller than the inner diameter of the top opening of the inlet port 3, and one end of the discharge port 9 extends into the interior of the inlet port 3, and the inlet port 3 and the discharge port 9 are interlocked.

[0054] A dustproof bag 23 is installed at the junction of the inlet 3 and the outlet 9. The top and bottom of the outer surface of the dustproof bag 23 are tied with straps 24. The straps 24 are respectively set at the top of the outlet 9 and the opening of the outer surface of the inlet 3.

[0055] Working principle: First, before operation, the staff checks the sealing and connection structure: confirm that the discharge port 9 and the inlet port 3 fit tightly, the dustproof bag 23 is undamaged and has no holes, and the binding strap 24 is firmly tied without any signs of loosening; adjust the embedding depth of the discharge port 9 to ensure that the material transmission path is smooth and there is no risk of jamming.

[0056] Next, the staff started the equipment, and the ground coal powder was discharged from the outlet 9 and entered the inlet 3 directly through the interlocking structure to prevent the material from being spilled or flying during the transmission process; the dustproof bag 23 at the junction of the inlet 3 and the outlet 9 plays a sealing role, preventing coal powder and dust leakage, protecting the working environment, and reducing dust waste.

[0057] Then, during the operation of the equipment, the vibration of the screening equipment 2 is buffered by the connecting spring 5 and will not be transmitted to the grinding equipment 8, ensuring that the fitting structure of the discharge port 9 and the feed port 3 is stable and there is no relative displacement; the flexibility of the dustproof bag 23 is adapted to slight vibration, avoiding the failure of the seal due to equipment vibration, and the binding strap 24 further reinforces it to prevent the dustproof bag 23 from falling off.

[0058] Staff regularly observe the condition of the dustproof bag 23. If excessive dust is found or it is slightly damaged, the machine should be stopped immediately. After the operation is completed, the staff loosens the binding strap 24, removes the dustproof bag 23, cleans the residual coal powder inside and on the outer surface, checks whether there is any material residue on the mating surface of the feed inlet 3 and the discharge outlet 9, and reinstalls the dustproof bag 23 and secures it tightly to prepare for the next operation.

[0059] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A coal powder treatment device for a power plant, comprising a base (1), a screening device (2) disposed above the base (1), and a feed inlet (3) provided on the upper surface of the screening device (2), characterized in that, The screening equipment (2) has screens (4) arranged side by side on the inner wall, and a discharge port (7) is fixedly installed at the bottom of the front end face of the screening equipment (2). A grinding device (8) is provided above the screening device (2). A discharge port (9) is fixedly installed at the bottom of the grinding device (8). A filler pipe (10) is provided at the middle of the top of the grinding device (8). A device support (11) is fixedly installed on the outer surface of the grinding device (8). A conveying mechanism is provided on the outer surface of the screening device (2) for sending the material in the screening device (2) back to the grinding device (8) for further processing. The conveying mechanism includes a connecting pipe (12), which is fixedly installed on one side of the inner wall of the screening equipment (2) near the screen (4). A conveying pipe (13) is fixedly installed on the outside of the connecting pipe (12). A support shaft (14) is rotatably installed at the upper and lower ends of the inner wall of the conveying pipe (13). A spiral conveying frame (15) is fixedly installed on the outer surface of the support shaft (14). A second drive unit (16) is provided on the bottom surface of the support shaft (14) outside the conveying pipe (13). A guide pipe (17) is fixedly installed on the top of one side of the inner wall of the conveying pipe (13) into the grinding equipment (8). The grinding equipment (8) is also equipped with a grinding mechanism for grinding larger coal particles into powder.

2. The pulverized coal treatment device for a power plant according to claim 1, characterized in that, The grinding mechanism includes a grinding roller (18), which is rotatably mounted at the middle of the front and rear ends of the inner wall of the grinding equipment (8). Several grinding parts (19) are fixedly mounted on the outer surface of the grinding roller (18). A third driving part (20) is provided at the middle of one end of the grinding roller (18) extending to the outside of the grinding equipment (8). A support plate (21) is fixedly mounted on the inner wall of the grinding equipment (8) near the grinding roller (18). A filter screen (22) is provided at the middle position of the support plate (21).

3. A pulverized coal treatment device for a power plant according to claim 2, characterized in that, The filter screen (22) has an arc-shaped cross-section, and the bottom of the outer surface of the grinding roller (18) is located inside the filter screen (22). The grinding roller (18) and the filter screen (22) are coupled to each other.

4. A pulverized coal treatment device for a power plant according to claim 1, characterized in that, The outer diameter of the discharge port (9) is smaller than the inner diameter of the top opening of the feed port (3). One end of the discharge port (9) extends into the inside of the feed port (3). The feed port (3) and the discharge port (9) are interlocked.

5. A pulverized coal treatment device for a power plant according to claim 1, characterized in that, A dustproof bag (23) is provided at the junction of the feed inlet (3) and the discharge outlet (9). The top and bottom of the outer surface of the dustproof bag (23) are tied with straps (24). The straps (24) are respectively set at the top of the discharge outlet (9) and the opening of the outer surface of the feed inlet (3).

6. A pulverized coal treatment device for a power plant according to claim 1, characterized in that, The upper surface edge of the equipment base (1) is provided with several connecting springs (5), the top of the connecting springs (5) is fixed to the bottom of the outer surface of the screening equipment (2), and the bottom of the inner wall of the equipment base (1) is provided with a first driving part (6), the upper surface output end of the first driving part (6) is connected to the middle of the bottom of the screening equipment (2).

7. A pulverized coal treatment device for a power plant according to claim 1, characterized in that, The top of the inner wall of the screen (4) and the screening equipment (2) are both set as cone structures. The junction of the edge of the screen (4) and the inner wall of the screening equipment (2) is set as a horizontal connecting plate. The bottom of the inner wall of the connecting pipe (12) is flush with the horizontal connecting plate.

8. A pulverized coal treatment device for a power plant according to claim 1, characterized in that, The discharge port (7) and multiple connecting ports (12) are equidistantly distributed along the outer surface of the screening equipment (2), and the bottom surface of the second drive unit (16) is fixed to the horizontal support of the equipment bracket (11).

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