Fuel particle screening device for thermal power plant

Abstract

The invention belongs to the technical field of fuel particle screening, and particularly relates to a fuel particle screening device for a thermal power plant, which comprises a box body, the box body is hollow, the inner wall of the box body is rotatably connected with a screening cylinder, the side wall of the box body is fixedly connected with a pneumatic seat, and the pneumatic seat is connected with the screening cylinder. A rotating shaft is coaxially and rotationally connected to the inner wall of one side of the screening cylinder, and the other end of the rotating shaft rotationally penetrates through the box body; the screening barrel is driven to swing in a reciprocating mode in a high-pressure air alternate input mode, fuel particles are prevented from being broken due to excessive collision in the screening process, the screening barrel can also be driven to generate vibration when swinging, the situation that chips block screening holes is avoided, meanwhile, the chips in the fuel particles are vibrated to be close to the inner bottom wall of the screening barrel, and the screening efficiency is improved. And the high-pressure air can also turn over the chippings carried in the upper particles to the position close to the inner bottom wall of the screening barrel, and the chippings can pass through screening holes more easily in combination with shaking of the screening barrel.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel particle screening, and in particular relates to a fuel particle screening device for a thermal power plant. Background Art

[0002] In thermal power plants, especially those using biomass and other pellet fuels, fuel particle screening is a crucial pretreatment step. The purpose of screening is to remove small debris, impurities, or unqualified particles from the fuel, ensuring that the fuel entering the boiler is uniformly sized and meets requirements. This improves combustion efficiency, reduces pollutant emissions, and protects subsequent combustion equipment.

[0003] However, during the screening process of existing traditional screening devices, fuel particles are easily broken due to excessive collision and friction, which not only causes fuel loss but also affects the subsequent combustion efficiency. The debris easily blocks the screening holes, resulting in a decrease in screening efficiency. It is also difficult to completely screen out the debris entrained in the fuel particles, affecting the screening quality.

[0004] Therefore, a fuel particle screening device for thermal power plants is needed to solve the technical problems in the prior art that fuel particles are broken due to excessive collision, debris easily clogs the screening holes, and debris entrained in the fuel particles is difficult to completely screen out. Summary of the Invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a fuel particle screening device for a thermal power plant. The present application uses alternating input of high-pressure air to drive the screening drum to swing back and forth, which solves the technical problem of fuel particles being broken due to excessive collision in the prior art. The screening drum can also drive vibration when swinging, which solves the technical problem of debris easily clogging the screening holes in the prior art. The vibration can also make the debris in the fuel particles close to the bottom wall of the screening drum. The high-pressure air can also drive the rotating shaft and the screening drum to rotate in the opposite direction, turning the debris entrained in the upper particles to a position close to the bottom wall of the screening drum, solving the technical problem of the prior art that the debris entrained in the fuel particles is difficult to be completely screened out.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions: A fuel particle screening device for a thermal power plant proposed in this solution includes a box body, which is hollow, a feed hopper fixedly connected to a side wall of the box body, and a discharge hopper fixedly connected to the other side wall of the box body. A screening drum is rotatably connected to the inner wall of the box body, and a pneumatic seat is fixedly connected to the side wall of the box body. The pneumatic seat is connected to the screening drum, and a rotating shaft is coaxially rotatably connected to the inner wall of one side of the screening drum. The other end of the rotating shaft rotates through the box body, and the rotating shaft is connected to the pneumatic seat through an air pipe. One end of the feed hopper is connected to one end of the screening drum, and one end of the discharge hopper is connected to the other end of the screening drum. A pneumatic reversing valve is fixedly connected to the side wall of the box body, and the output ends of both ends of the pneumatic reversing valve are respectively connected to the pneumatic seat through air pipes, and the input end of the pneumatic reversing valve is connected to an external air source through an air pipe. A dust removal bag is fixedly connected to one side of the bottom wall of the box body, and a programmable timer is fixedly connected to the side wall of the box body, and the programmable timer is electrically connected to the pneumatic reversing valve.

[0007] Preferably, the inner circumferential wall of the screening cylinder is conical, one end of the screening cylinder is open, and an array of screening holes is passed through the circumferential wall of the screening cylinder. A blocking ring is fixedly connected to the inner circumferential wall of the screening cylinder in an array, and the blocking ring is semi-annular, which separates the screening cylinder. When the material passes through the screening cylinder, it is blocked and decelerated. The outer circumferential wall of the screening cylinder is fixedly connected to an extrusion block in an annular array, and the extrusion block is arranged in an arc shape.

[0008] Preferably, the pneumatic seat is hollow, and a partition plate is fixedly connected to the pneumatic seat, and the partition plate divides the hollow part of the pneumatic seat into a first cavity and a second cavity, the first cavity and the second cavity are respectively connected to the pneumatic reversing valve through an air pipe, and the air intake directions of the first cavity and the second cavity are relatively arranged, a first impeller is coaxially connected to the first cavity for rotation, and a second impeller is coaxially connected to the first cavity for rotation, the first impeller, the second impeller and the screening cylinder are coaxially fixedly connected, and a first air pipe and a second air pipe are fixedly connected to the side wall of the pneumatic seat, and the first air pipe and the second air pipe are respectively connected to the first cavity and the second cavity.

[0009] Preferably, a first communicating groove and a second communicating groove are provided in the rotating shaft, the first communicating groove is connected to the second cavity through a second air pipe, the second communicating groove is connected to the first cavity through a first air pipe, a blowing ring is coaxially fixedly connected to the rotating shaft in a linear array, the blowing ring is hollow, and a first blowing head and a second blowing head are fixedly connected to the outer circumferential wall of the blowing ring in an annular array, the first blowing head is connected to the first communicating groove, the second blowing head is connected to the second communicating groove, and the air outlet directions of the first blowing head and the second blowing head are opposite, a pushing rake is fixedly connected to the blowing ring, and the bottom wall of the pushing rake is in sliding contact with the inner circumferential wall of the screening cylinder.

[0010] Preferably, the linear array of the top wall of the box body is longitudinally slidably connected to a guide rod, the bottom wall of the guide rod is rotatably connected to a knocking ball, and a guide spring is sleeved on the guide rod, and the two ends of the guide spring are respectively fixedly connected to the top wall of the box body and the bottom end of the guide rod.

[0011] The beneficial effects achieved by the present invention using the above structure are as follows: 1. This application utilizes alternating high-pressure air input to drive the screening drum to swing back and forth, reducing the risk of fuel particles being broken by excessive collision during the screening process. The screening drum can also generate vibrations during its swinging, preventing debris from clogging the screening holes and simultaneously shaking the debris in the fuel particles close to the bottom wall of the screening drum. The high-pressure air can also drive the rotating shaft and the screening drum to rotate in the opposite direction, flipping the debris entrained in the upper particles close to the bottom wall of the screening drum. Combined with the shaking of the screening drum, the debris can more easily pass through the screening holes. 2. High-pressure air is alternately input into the first and second cavities of the pneumatic seat, driving the screening cylinder to swing back and forth, reducing the rotation of fuel particles during the screening process. This can reduce the breakage of fuel particles due to excessive collision during the screening process. While ensuring screening efficiency, it maintains the integrity of fuel particles to the greatest extent and reduces fuel loss. The inner circumferential wall of the screening cylinder is conical and is equipped with a blocking ring. When the material passes through, it is blocked and decelerated, extending the screening time and allowing more time for the debris to pass through the screening holes. 3. The screening cylinder also drives the extrusion block to swing, and the extrusion block drives the knocking ball to hit the screening cylinder, generating vibration, which can effectively prevent debris from clogging the screening holes. At the same time, the debris in the vibrating fuel particles is close to the bottom wall of the screening cylinder, thereby improving the screening effect and efficiency. 4. The blowing ring on the rotating shaft and the blowing heads with different air outlet directions drive the rotating shaft and the screening cylinder to rotate in opposite directions under the action of high-pressure air. The pushing rake on the blowing ring actively turns over the fuel particles, turning the debris entrained in the upper particles to a position close to the bottom wall of the screening cylinder. Combined with the shaking of the screening cylinder, the debris can pass through the screening holes more easily, further improving the accuracy and thoroughness of screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention.

[0013] Figure 1 This is a schematic diagram of the overall structure of a fuel particle screening device for a thermal power plant proposed by the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional connection structure of a fuel particle screening device for a thermal power plant proposed by the present invention; Figure 3This is a schematic diagram of the internal connection structure of a screening cylinder of a fuel particle screening device for a thermal power plant proposed by the present invention; Figure 4 This is a schematic diagram of a partial cross-sectional structure of a box of a fuel particle screening device for a thermal power plant proposed by the present invention; Figure 5 This is a schematic cross-sectional view of the pneumatic seat of a fuel particle screening device for a thermal power plant proposed by the present invention; Figure 6 This is a schematic diagram of the internal connection structure of the first cavity of a fuel particle screening device for a thermal power plant proposed by the present invention; Figure 7 This is a schematic diagram of the internal connection structure of the second cavity of a fuel particle screening device for a thermal power plant proposed by the present invention; Figure 8 This is a schematic diagram of the rotating shaft connection structure of a fuel particle screening device for a thermal power plant proposed by the present invention; Figure 9 This is a schematic diagram of a partial cross-sectional structure of a fuel particle screening device for a thermal power plant proposed by the present invention from another perspective.

[0014] In the accompanying drawings: 1. Box body, 2. Pneumatic reversing valve, 3. Pneumatic seat, 4. Screening cylinder, 5. Rotating shaft, 6. Discharge hopper, 7. Feed hopper, 8. Dust bag, 9. Programmable timer, 11. Guide rod, 12. Guide spring, 13. Knocking ball, 41. Blocking ring, 42. Extrusion block, 31. Partition plate, 32. First cavity, 33. Second cavity, 34. First impeller, 35. Second impeller, 301. First air pipe, 302. Second air pipe, 51. Blowing ring, 55. First connecting groove, 56. Second connecting groove, 57. First blowing head, 58. Second blowing head, 511. Push rake.

[0015] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] Example 1, as Figures 1-9As shown, the present invention proposes a fuel particle screening device for a thermal power plant, comprising a box body 1, the box body 1 being hollow, the side wall of the box body 1 being fixedly connected to a feed hopper 7, the other side wall of the box body 1 being fixedly connected to a discharge hopper 6, the inner wall of the box body 1 being rotatably connected to a screening cylinder 4, the side wall of the box body 1 being fixedly connected to a pneumatic seat 3, the pneumatic seat 3 being connected to the screening cylinder 4, the inner wall of one side of the screening cylinder 4 being coaxially rotatably connected to a rotating shaft 5, the other end of the rotating shaft 5 being rotatably passed through the box body 1, the rotating shaft 5 being connected to the pneumatic seat 3. The dynamic seat 3 is connected through an air pipe, one end of the feed hopper 7 is connected to one end of the screening cylinder 4, and one end of the discharge hopper 6 is connected to the other end of the screening cylinder 4. The side wall of the box body 1 is fixedly connected with a pneumatic reversing valve 2, and the output ends at both ends of the pneumatic reversing valve 2 are respectively connected to the pneumatic seat 3 through air pipes, and the input end of the pneumatic reversing valve 2 is connected to the external air source through an air pipe. A dust removal bag 8 is fixedly connected to one side of the bottom wall of the box body 1, and a programmable timer 9 is fixedly connected to the side wall of the box body 1. The programmable timer 9 is electrically connected to the pneumatic reversing valve 2.

[0018] like Figures 1-4 and Figure 9 As shown, the inner circumferential wall of the screening cylinder 4 is conical, one end of the screening cylinder 4 is open, and an array of screening holes is passed through the half of the circumferential wall of the screening cylinder 4. A blocking ring 41 is fixedly connected to the inner circumferential wall of the screening cylinder 4 in an array. The blocking ring 41 is semi-annular and separates the screening cylinder 4. When the material passes through the screening cylinder 4, it is blocked and decelerated. The outer circumferential wall of the screening cylinder 4 is fixedly connected to an extrusion block 42 in an annular array. The extrusion block 42 is arranged in an arc shape.

[0019] like Figure 1-Figure 2 and Figure 5-Figure 7As shown, the pneumatic seat 3 is hollow, and a partition plate 31 is fixedly connected to the pneumatic seat 3. The partition plate 31 divides the hollow part of the pneumatic seat 3 into a first cavity 32 and a second cavity 33. The first cavity 32 and the second cavity 33 are respectively connected to the pneumatic reversing valve 2 through an air pipe, and the air intake directions of the first cavity 32 and the second cavity 33 are opposite to each other. A first impeller 34 is coaxially connected to the first cavity 32 for rotation, and a second impeller 35 is coaxially connected to the first cavity 32 for rotation. The first impeller 34, the second impeller 35 and the screening drum 4 are coaxially fixedly connected. A first air pipe 301 and a second air pipe 302 are fixedly connected to the side wall of the pneumatic seat 3. The first air pipe 301 and the second air pipe 302 are respectively connected to the first cavity 32 and the second cavity 33. Since the first cavity 32 and the second cavity 33 are in opposite air intake directions, when high-pressure air is input into the pneumatic reversing valve 2, the programmable The timer 9 starts. When the high-pressure air is input into the first cavity 32 through the pneumatic reversing valve 2, the pneumatic reversing valve 2 controls the high-pressure air to stop being input into the second cavity 33. After the timing of the programmable timer 9 ends, it sends an electrical signal to the pneumatic reversing valve 2. When the pneumatic reversing valve 2 controls the high-pressure air to be input into the second cavity 33, the pneumatic reversing valve 2 controls the high-pressure air to stop being input into the first cavity 32. The programmable timer 9 times again. The programmable timer 9 cyclically controls the pneumatic reversing valve 2 to input high-pressure air into the first cavity 32 and the second cavity 33 in sequence. When the high-pressure air is input into the first cavity 32 and drives the first impeller 34 to rotate, the first impeller 34 drives the screening drum 4 to rotate through the second impeller 35. When the high-pressure air is input into the second cavity 33 and drives the second impeller 35 to rotate, the second impeller 35 drives the screening drum 4 and the first impeller 34 to rotate in opposite directions, driving the screening drum 4 to swing back and forth.

[0020] like Figure 1-Figure 3 and Figure 5-Figure 8As shown, a first communicating groove 55 and a second communicating groove 56 are provided in the rotating shaft 5, the first communicating groove 55 is communicated with the second cavity 33 through the second air pipe 302, and the second communicating groove 56 is communicated with the first cavity 32 through the first air pipe 301, and a blowing ring 51 is coaxially fixedly connected to the rotating shaft 5 in a linear array, and the blowing ring 51 is hollow. A first blowing head 57 and a second blowing head 58 are fixedly connected in an annular array on the outer circumferential wall of the blowing ring 51, the first blowing head 57 is communicated with the first communicating groove 55, and the second blowing head 58 is communicated with the second communicating groove 56, and the air outlet directions of the first blowing head 57 and the second blowing head 58 are opposite, and a pushing rake 511 is fixedly connected to the blowing ring 51, and the bottom wall of the pushing rake 511 is connected to the bottom wall of the pushing rake 511. The inner circumferential wall of the screening drum 4 is arranged in sliding contact. When the high-pressure air in the second cavity 33 is input into the first blowing head 57 through the second air pipe 302 and the first communicating groove 55 and blown out, the rotating shaft 5 is driven to swing. At this time, the rotation direction of the rotating shaft 5 is opposite to the direction in which the second impeller 35 drives the screening drum 4 to rotate. When the high-pressure air in the first cavity 32 is input into the second blowing head 58 through the first air pipe 301 and the second communicating groove 56 and blown out, the rotating shaft 5 is driven to swing. At this time, the rotation direction of the rotating shaft 5 is opposite to the direction in which the first impeller 34 drives the screening drum 4 to rotate. When the screening drum 4 drives the biomass particles to shake, the reciprocating swinging rotating shaft 5 drives the pushing rake 511 to flip the biomass particles, so as to facilitate flipping the debris entrained in the upper biomass particles to a position close to the inner bottom wall of the screening drum 4.

[0021] like Figure 1-Figure 3 and Figure 9 As shown, the top wall linear array of the box body 1 is longitudinally slidably connected to the guide rod 11, the bottom wall of the guide rod 11 is rotatably connected to the knocking ball 13, and a guide spring 12 is sleeved on the guide rod 11. The two ends of the guide spring 12 are respectively fixedly connected to the top wall of the box body 1 and the bottom end of the guide rod 11. When the screening drum 4 swings back and forth, the screening drum 4 drives the extrusion block 42 to swing back and forth, and the arc surface of the extrusion block 42 contacts the knocking ball 13. The extrusion block 42 drives the knocking ball 13 and the guide rod 11 to move, compressing The guide spring 12 is compressed to its limit, and the knocking ball 13 contacts the arc-shaped vertex of the extrusion block 42 at the same time. Then the guide spring 12 is reset, and the guide spring 12 drives the guide rod 11 and the knocking ball 13 to reset. The knocking ball 13 hits the screening cylinder 4, vibrating the screening cylinder 4, so as to facilitate the vibration of the biomass particles blocked in the screening hole, avoid the debris from clogging the screening hole, and also shake the debris in the biomass particles close to the inner bottom wall of the screening cylinder 4, and cooperate with the screening cylinder 4 to shake the biomass particles, so as to facilitate the screening of the debris.

[0022] When in use, the input end of the discharge hopper 6 and the output end of the feed hopper 7 are respectively connected to a Fuyi De sealed large-angle conveyor (model: FM-3MF3DQ) to ensure the sealing of the box body when conveying biomass particles.

[0023] Place the device in a suitable position, connect the input end of the discharge hopper 6 and the output end of the feed hopper 7 to the Fuyi De sealed large-angle conveyor respectively, and the external air source inputs the high-pressure airflow into the pneumatic reversing valve 2 through the air pipe. The programmable timer 9 is started. When the high-pressure air is input into the first cavity 32 through the pneumatic reversing valve 2, the pneumatic reversing valve 2 controls the high-pressure air to stop being input into the second cavity 33. After the timing of the programmable timer 9 ends, an electrical signal is sent to the pneumatic reversing valve 2. When the pneumatic reversing valve 2 controls the high-pressure air to be input into the second cavity 33, the pneumatic reversing valve 2 controls the high-pressure air to stop being input into the first cavity 32. The programmable timer 9 times again. The device 9 circulates and timing-controls the pneumatic reversing valve 2 to sequentially input high-pressure air into the first cavity 32 and the second cavity 33. When the high-pressure air is input into the first cavity 32, the high-pressure air drives the first impeller 34 to rotate, and the first impeller 34 drives the screening drum 4 to rotate through the second impeller 35. The screening drum 4 drives the blocking ring 41 and the extrusion block 42 to rotate. At this time, the screening drum 4 swings half a circle. When the high-pressure air is input into the second cavity 33, the high-pressure air drives the second impeller 35 to rotate, and the second impeller 35 drives the screening drum 4 and the first impeller 34 to rotate in opposite directions. The different air inlet directions of the high-pressure air drive the screening drum 4 to swing back and forth, thereby reducing the breakage of biomass particles when screening. The Fuyi De sealed high-angle conveyor connected to the discharge hopper 6 and the feed hopper 7 is started, and the biomass particles are conveyed to the screening drum 4 through the Fuyi De sealed high-angle conveyor connected to the feed hopper 7 and the feed hopper 7. The biomass particles screened by the screening drum 4 are output to the box through the discharge hopper 6 and the Fuyi De sealed high-angle conveyor connected to the discharge hopper 6; When the high-pressure air in the first cavity 32 is input into the second blowing head 58 through the first air pipe 301 and the second communicating groove 56 and blown out, the blowing ring 51 and the rotating shaft 5 are driven to rotate. At this time, the rotation direction of the rotating shaft 5 is opposite to the direction in which the first impeller 34 drives the screening drum 4 to rotate. The blowing ring 51 drives the pushing rake 511 to swing along the opposite rotation direction of the screening drum 4. When the high-pressure air in the second cavity 33 is input into the first blowing head 57 through the first communicating groove 55 and blown out, the blowing ring 51 and the rotating shaft 5 are driven to rotate. At this time, the rotation direction of the rotating shaft 5 is opposite to the direction in which the second impeller 35 drives the screening drum 4 to rotate. In the opposite direction, the blowing ring 51 drives the pushing rake 511 to swing along the opposite rotation direction of the screening drum 4. When the screening drum 4 drives the biomass particles to shake, the pushing rake 511 rotates in the opposite direction to the screening drum 4, and the pushing rake 511 actively turns over the biomass particles, so as to turn over the debris entrained in the upper biomass particles to a position close to the inner circumferential wall of the screening drum 4. The high-pressure air cooperates with the shaking screening drum 4 to screen out the debris, and the high-pressure air carries the debris to the dust bag 8, which filters the debris. The swinging screening drum 4 drives the biomass particles to move, and the biomass particles pass through the blocking ring 41 and gradually enter the discharge hopper 6; When the screening cylinder 4 drives the extrusion block 42 to swing back and forth, the arc surface of the extrusion block 42 contacts the knocking ball 13, and the extrusion block 42 drives the knocking ball 13 and the guide rod 11 to move, compressing the guide spring 12. As the guide spring 12 is compressed to the limit, the knocking ball 13 contacts the vertex of the arc surface of the extrusion block 42, and then the guide spring 12 is reset, and the guide spring 12 drives the guide rod 11 and the knocking ball 13 to reset, and the knocking ball 13 hits the screening cylinder 4, vibrating the screening cylinder 4, so as to facilitate the vibration of the biomass particles blocked in the screening hole, avoid debris from clogging the screening hole, and also vibrate the debris in the biomass particles to the inner circumferential wall of the screening cylinder 4, cooperating with the screening cylinder 4 to shake the biomass particles, so as to facilitate the screening out of the debris.

[0024] The above description of the present invention and its embodiments is non-limiting. The accompanying drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design of a structure and embodiment similar to the technical solution, they shall fall within the scope of protection of the present invention.

Claims

1. A fuel particle screening device for a thermal power plant, comprising a housing (1), wherein the housing (1) is hollow and characterized in that: The box body (1) is rotatably connected to screening cylinders (4) on both sides, and the side wall of the box body (1) is fixedly connected to a pneumatic seat (3), and the pneumatic seat (3) is connected to the screening cylinder (4). The inner wall of one side of the screening cylinder (4) is coaxially rotatably connected to a rotating shaft (5), and the other end of the rotating shaft (5) rotates through the box body (1), and the rotating shaft (5) is connected to the pneumatic seat (3) through an air pipe. The side wall of the box body (1) is fixedly connected to an air intake solenoid valve (2), and the output ends of the two ends of the pneumatic reversing valve (2) are respectively connected to the pneumatic seat (3) through the air pipe.

2. The fuel particle screening device for a thermal power plant according to claim 1, characterized in that: The inner circumferential wall of the screening cylinder (4) is arranged in a conical shape, a blocking ring (41) is fixedly connected in an array on the inner circumferential wall of the screening cylinder (4), and an extrusion block (42) is fixedly connected in an annular array on the outer circumferential wall of the screening cylinder (4).

3. The fuel particle screening device for a thermal power plant according to claim 2, characterized in that: The pneumatic seat (3) is hollow, and a partition plate (31) is fixedly connected to the inside of the pneumatic seat (3). The partition plate (31) divides the hollow part of the pneumatic seat (3) into a first cavity (32) and a second cavity (33), and the air intake directions of the first cavity (32) and the second cavity (33) are opposite.

4. The fuel particle screening device for a thermal power plant according to claim 3, characterized in that: A first communicating groove (55) and a second communicating groove (56) are provided in the rotating shaft (5), and the first communicating groove (55) and the second communicating groove (56) are respectively communicated with the second cavity and the first cavity (32).

5. The fuel particle screening device for a thermal power plant according to claim 4, characterized in that: A blowing ring (51) is coaxially fixedly connected to the rotating shaft (5) in a linear array, and a first blowing head (57) and a second blowing head (58) are fixedly connected to the outer circumferential wall of the blowing ring (51) in an annular array. The first blowing head (57) and the second blowing head (58) are respectively connected to the first connecting groove (55) and the second connecting groove (56), and the air outlet directions of the first blowing head (57) and the second blowing head (58) are opposite.

6. The fuel particle screening device for a thermal power plant according to claim 2, characterized in that: The top wall linear array of the box body (1) is longitudinally slidably connected to a guide rod (11), and the bottom wall of the guide rod (11) is rotatably connected to a knocking ball (13), and the knocking ball (13) is arranged on the movement path of the extrusion block (42).

7. The fuel particle screening device for a thermal power plant according to claim 1, characterized in that: A programmable timer (9) is fixedly connected to the side wall of the box body (1), and the programmable timer (9) is electrically connected to the pneumatic reversing valve (2).

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