A dust treatment device for coal-fired boiler

Abstract

The present invention discloses a dust treatment device for a coal-fired boiler, which relates to the technical field of coal furnace dust treatment, and includes a coal furnace shell, a smoke guide pipe, a fan, and a smoke outlet pipe. A smoke guide plate is fixed inside the smoke outlet pipe, and a through hole for smoke exhaust is arranged at the top of the smoke guide plate, and a filtering mechanism. The present invention sets a filtering mechanism, and the first moving block moves to drive the cleaning brush to rotate through mechanical transmission, and the cleaning brush rotates and cleans the bottom end of the first filter plate. This structure is conducive to filtering the smoke discharged from the smoke outlet pipe, and avoids the emission of harmful gases such as carbon monoxide and sulfur dioxide into the air. At the same time, the cleaning operation of the first filter plate by the cleaning brush is conducive to ensuring the normal exhaust operation of the smoke from the first filter plate. The setting of the collection box is conducive to the timely collection of the dust filtered in the smoke outlet pipe, and avoids the situation where too much dust appears in the smoke outlet pipe and reduces the filtering effect.

Description

Technical Field

[0001] The invention relates to the technical field of coal furnace dust treatment, in particular to a dust treatment device for a coal-fired boiler. Background Art

[0002] A coal-fired boiler refers to coal that is burned as fuel. After the heat from the coal is converted, it produces steam or becomes hot water, but not all the heat is effectively converted. Some of the heat is consumed as reactive power, which creates an efficiency problem. Generally, larger boilers have higher efficiency, between 60% and 80%. Coal-fired boilers are mainly classified according to their use. They are divided into coal-fired water boilers (supplying boiling water), coal-fired hot water boilers (heating and bathing), coal-fired steam boilers (supplying steam), coal-fired thermal oil boilers (cooking and drying), etc.

[0003] When the current coal-fired boiler is in use, the flue gas discharged from the coal furnace contains a large amount of dust. The current coal furnace smoke outlet pipe mostly filters the dust through a filter when exhausting the smoke. However, after the filter has been used for a long time, a large amount of filtered dust will adhere to the surface of the filter. The accumulation of dust will reduce the filtering effect of the filter, resulting in a decrease in the exhaust rate. At the same time, the dust filtered by the filter will accumulate inside the smoke outlet pipe. Currently, most of the operations of cleaning the filtered dust are performed manually. The device needs to stop working during manual cleaning, and the filtered dust cannot be automatically collected when the device is working. Therefore, a dust treatment device for a coal-fired boiler is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide a dust treatment device for a coal-fired boiler in order to solve the problems of low smoke exhaust rate of a smoke exhaust pipe and failure to collect dust in time.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dust treatment device for a coal-fired boiler, comprising a coal furnace shell, a smoke guide pipe for guiding smoke is arranged at one end of the coal furnace shell, a fan for extracting smoke is arranged at one end of the smoke guide pipe, a smoke outlet pipe for exhausting smoke is arranged on one side of the fan, a smoke guide plate for guiding smoke is fixed to the inside of the smoke outlet pipe by welding, a through hole for exhausting smoke is arranged at the top of the smoke guide plate, and a filtering mechanism, wherein the filtering mechanism comprises a first filter plate arranged at the top of the smoke outlet pipe for filtering dust for the second time, and the second filter plate is provided at the top of the smoke outlet pipe for filtering dust for the second time. The bottom end of a filter plate is rotatably connected with a rotating disk through a bearing, the bottom end of the rotating disk is fixed with a rotating rod by welding, the outer wall of the rotating rod is provided with an activated carbon plate for absorbing carbon monoxide and sulfur dioxide, the bottom end of the rotating rod is sleeved with a moving rod, the outer wall of the moving rod is sleeved with a fixing column, the outer wall of the fixing column is fixedly connected with a second filter plate for filtering dust for the first time, the bottom end of the moving rod is fixed with a rotating rod penetrating to the outside of the fixing column by welding, and the bottom end of the rotating rod is fixed with a first moving block for blocking the top opening of the smoke guide plate by welding;

[0006] The collecting mechanism comprises a collecting box arranged at both ends of the smoke outlet pipe for collecting dust, one end of the collecting box is provided with a dust inlet, and one end of the collecting box is provided with a second moving block for blocking the dust inlet.

[0007] As a further solution of the present invention: the filtering mechanism also includes a first spring arranged at the top end of the rotating rod, and the outer wall of the rotating disk is connected to symmetrically distributed cleaning brushes, and the top end of the cleaning brush is in contact with the bottom end of the first filter plate.

[0008] As a further solution of the present invention: the outer wall of the moving rod is provided with a ball, and the inner wall of the rotating rod is formed with an annular groove matching the protrusion on the outer wall of the moving rod.

[0009] As a further solution of the present invention: a seal is provided at the connection between the bottom end of the first filter plate and the smoke outlet pipe, and a seal is provided at the connection between the activated carbon plate, the second filter plate and the inner wall of the smoke outlet pipe.

[0010] As a further solution of the present invention: the rotating rod is rotatably connected to the activated carbon plate via a bearing, and a sealing member is provided at the connection between the rotating rod and the activated carbon plate.

[0011] As a further scheme of the present invention: the collecting mechanism also includes a connecting block fixed to the top of the first moving block by welding, one end of the connecting block is rotatably connected to a first connecting rod, one end of the first connecting rod is rotatably connected to a first U-shaped rod extending to the outside of the smoke outlet pipe, one end of the first U-shaped rod penetrates into the interior of the collecting box, and one end of the first U-shaped rod is provided with a piston that fits with the inner wall of the collecting box, the top of the first U-shaped rod is fixed with a fixed block by welding, the top of the fixed block is sleeved with a sliding block, a second connecting rod is provided inside the collecting box, the second connecting rod is located between the sliding block and the piston, one end of the second connecting rod is rotatably connected to a first rack, the bottom end of the first rack is meshed with a spur gear, the bottom end of the spur gear is meshed with a second rack, the bottom end of the second rack is provided with a second U-shaped rod fixedly connected to one end of the second moving block, and a second spring is provided at the bottom end of the sliding block.

[0012] As a further solution of the present invention: a sealing member is provided at the contact position between the smoke outlet pipe and the first U-shaped rod.

[0013] As a further solution of the present invention: two fixed blocks are provided, one of which is located inside the collection box, and the other is located outside the collection box, and one end of the collection box is provided with a through groove matching the moving trajectory of the fixed block and the sliding block, the top end of the sliding block and the bottom end of the second connecting rod are arranged in an arc shape, and the interior of the fixed block is provided with a moving groove matching the sliding block.

[0014] As a further solution of the present invention: the interior of the collecting box is provided with a rotating groove matching the rotating trajectory of the second connecting rod, the interior of the collecting box is provided with a limiting movable groove matching the first rack, the second rack and the second U-shaped rod, and one side of the spur gear is rotatably connected to the inner wall of the collecting box through a rotating shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] By setting up a filtering mechanism, the first moving block moves and drives the cleaning brush to rotate through mechanical transmission, and the cleaning brush rotates and cleans the bottom end of the first filter plate. This structure is conducive to filtering the smoke discharged from the smoke outlet pipe, avoiding the discharge of harmful gases such as carbon monoxide and sulfur dioxide into the air. At the same time, the cleaning operation of the first filter plate by the cleaning brush is conducive to ensuring the normal discharge operation of the smoke from the first filter plate. The provision of a collecting box is conducive to the timely collection of dust filtered in the smoke outlet pipe, avoiding the situation where too much dust appears in the smoke outlet pipe and reduces the filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the internal structure of the smoke outlet pipe, the fixing column and the smoke guide plate of the present invention;

[0019] Figure 3 For the present invention Figure 2 A is an enlarged structural diagram;

[0020] Figure 4 It is a schematic diagram of the internal structure of the smoke outlet pipe, the fixing column and the smoke guide plate of the present invention from another perspective;

[0021] Figure 5 It is a schematic diagram of the internal structure of the collection box of the present invention;

[0022] Figure 6 For the present invention Figure 5 The enlarged structural diagram at B in the middle;

[0023] Figure 7 It is a schematic diagram of the internal structure of the fixing block of the present invention;

[0024] Figure 8 It is a schematic diagram of the internal structure of the rotating rod of the present invention;

[0025] Fig. 9 It is a schematic diagram of the local structure of the collecting mechanism of the present invention.

[0026] In the figure: 1. coal stove shell; 2. smoke guide pipe; 3. fan; 4. filtering mechanism; 401. first filter plate; 402. rotating rod; 403. moving rod; 404. fixed column; 405. rotating rod; 406. first spring; 407. second filter plate; 408. activated carbon plate; 409. rotating disk; 410. cleaning brush; 411. first moving block; 5. collecting mechanism; 501. connecting block; 502. first connecting rod; 503. first U-shaped rod; 504. collecting box; 505. piston; 506. fixed block; 507. sliding block; 508. second connecting rod; 509. first rack; 510. spur gear; 511. second rack; 512. second U-shaped rod; 513. second moving block; 514. second spring; 6. smoke outlet pipe; 7. smoke guide plate. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field of coal furnace dust treatment technology without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in the field of coal furnace dust treatment technology, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of its embodiments based on the overall structure of the present invention.

[0029] See also Figures 1 to 9 In an embodiment of the present invention, a dust treatment device for a coal-fired boiler includes a coal furnace shell 1, a smoke guide pipe 2 for guiding smoke is arranged at one end of the coal furnace shell 1, a fan 3 for extracting smoke is arranged at one end of the smoke guide pipe 2, a smoke outlet pipe 6 for exhausting smoke is arranged on one side of the fan 3, a smoke guide plate 7 for guiding smoke is fixed to the inside of the smoke outlet pipe 6 by welding, a through hole for exhausting smoke is arranged at the top of the smoke guide plate 7, and a filter mechanism 4 includes a first filter plate 401 arranged at the top of the smoke outlet pipe 6 for filtering dust for the second time, and the bottom end of the first filter plate 401 is rotatably connected to a turntable 409 through a bearing , a rotating rod 402 is fixed to the bottom end of the rotating disk 409 by welding, an activated carbon plate 408 for absorbing carbon monoxide and sulfur dioxide is arranged on the outer wall of the rotating rod 402, a moving rod 403 is sleeved on the bottom end of the rotating rod 402, a fixed column 404 is sleeved on the outer wall of the moving rod 403, a second filter plate 407 for filtering dust for the first time is fixedly connected to the outer wall of the fixed column 404, a rotating rod 405 penetrating to the outside of the fixed column 404 is fixed to the bottom end of the moving rod 403 by welding, and a first moving block 411 for blocking the top opening of the smoke guide plate 7 is fixed to the bottom end of the rotating rod 405 by welding;

[0030] The collecting mechanism 5 includes a collecting box 504 arranged at both ends of the smoke outlet pipe 6 for collecting dust, one end of the collecting box 504 is provided with a dust inlet, and one end of the collecting box 504 is provided with a second moving block 513 for blocking the dust inlet.

[0031] In this embodiment: the fan 3 is used to guide the smoke into the interior of the smoke outlet pipe 6. The filter mechanism 4 is provided to facilitate filtering the smoke discharged from the smoke outlet pipe 6, thereby preventing harmful gases such as carbon monoxide and sulfur dioxide from being discharged into the air. At the same time, the cleaning operation of the first filter plate 401 by the cleaning brush 410 is beneficial to ensuring the normal discharge operation of the smoke from the first filter plate 401. The collection mechanism 5 is provided to facilitate the timely collection of the dust filtered in the smoke outlet pipe 6, thereby avoiding the situation where too much dust appears in the smoke outlet pipe 6 and reduces the filtering effect.

[0032] Please refer to Figure 2 , 3 , 4, 8, the filtering mechanism 4 also includes a first spring 406 arranged at the top of the rotating rod 405, and the outer wall of the rotating disk 409 is connected with symmetrically distributed cleaning brushes 410, and the top of the cleaning brush 410 is in contact with the bottom end of the first filter plate 401; the outer wall of the moving rod 403 is provided with a ball, and the inner wall of the rotating rod 402 is formed with an annular groove matching the protrusion on the outer wall of the moving rod 403; a seal is provided at the connection between the bottom end of the first filter plate 401 and the smoke outlet pipe 6, and a seal is provided at the connection between the activated carbon plate 408, the second filter plate 407 and the inner wall of the smoke outlet pipe 6; the rotating rod 402 is rotatably connected to the activated carbon plate 408 through a bearing, and a seal is provided at the connection between the rotating rod 402 and the activated carbon plate 408.

[0033] In this embodiment: after the coal stove shell 1 has completed one working cycle, the smoke is discharged from the smoke guide pipe 2. At the same time, the fan 3 works and draws the smoke in the smoke guide pipe 2 to the inside of the smoke outlet pipe 6. The smoke moves upward. Since the smoke pressure inside the smoke outlet pipe 6 is relatively large, the smoke will push the first moving block 411 to move upward. The movement of the first moving block 411 drives the rotating rod 405 to move. The movement of the rotating rod 405 drives the moving rod 403 to move. At the same time, the first spring 406 is squeezed by force. The movement of the moving rod 403 drives the protrusion on the outer wall of the moving rod 403 to move. The protrusion on the outer wall of the moving rod 403 moves in the annular groove on the inner wall of the rotating rod 402, thereby driving the rotating rod 402 to rotate. The rotation of the rotating rod 402 drives the rotating disk 409 to rotate. The rotation of the rotating disk 409 drives the cleaning brush 410 to rotate. The cleaning brush 410 rotates and cleans the bottom end of the first filter plate 401. The first moving block 411 moves upward and cleans the smoke guide plate 7. The opening at the top is opened, at this time, the flue gas passes through the smoke guide plate 7, and performs the first dust filtering operation through the second filter plate 407, and performs the carbon monoxide and sulfur dioxide filtering and absorption operation on the flue gas that has filtered the dust for the first time through the activated carbon plate 408, and then the flue gas that passes through the activated carbon plate 408 passes through the first filter plate 401 for secondary filtration, and then is discharged from the inside of the smoke outlet pipe 6 through the first filter plate 401. When the smoke inside the smoke outlet pipe 6 is discharged, the first movable block 411 is reset and moved under the action of the reset of the first spring 406, and the first movable block 411 is reset and closes the opening at the top of the smoke guide plate 7. This structure is conducive to filtering the smoke discharged from the smoke outlet pipe 6 to prevent harmful gases such as carbon monoxide and sulfur dioxide from being discharged into the air. At the same time, the cleaning operation of the first filter plate 401 by the cleaning brush 410 is conducive to ensuring the normal discharge operation of the smoke from the first filter plate 401.

[0034] Please refer to Figure 2 , 4, 5, 6, 7, the collecting mechanism 5 also includes a connecting block 501 fixed to the top of the first moving block 411 by welding, one end of the connecting block 501 is rotatably connected to the first connecting rod 502, one end of the first connecting rod 502 is rotatably connected to the first U-shaped rod 503 extending to the outside of the smoke outlet pipe 6, one end of the first U-shaped rod 503 penetrates into the interior of the collecting box 504, and one end of the first U-shaped rod 503 is provided with a piston 505 that fits the inner wall of the collecting box 504, and the first U-shaped rod 50 The top of the collecting box 504 is fixed with a fixed block 506 by welding, and the top of the fixed block 506 is sleeved with a sliding block 507. A second connecting rod 508 is arranged inside the collecting box 504, and the second connecting rod 508 is located between the sliding block 507 and the piston 505. One end of the second connecting rod 508 is rotatably connected to a first rack 509, and the bottom end of the first rack 509 is meshed with a spur gear 510, and the bottom end of the spur gear 510 is meshed with a second rack 511, and the bottom end of the second rack 511 is provided with a The second U-shaped rod 512 is fixedly connected to one end of the second moving block 513, and a second spring 514 is arranged at the bottom end of the sliding block 507; a sealing member is arranged at the contact position between the smoke outlet pipe 6 and the first U-shaped rod 503; two fixed blocks 506 are arranged, one of which 506 is located inside the collecting box 504, and the other fixed block 506 is located outside the collecting box 504, and one end of the collecting box 504 is provided with a through groove matching the moving trajectory of the fixed block 506 and the sliding block 507, the top of the sliding block 507 and the bottom end of the second connecting rod 508 are arranged in an arc shape, and the interior of the fixed block 506 is provided with a moving groove matching the sliding block 507; the interior of the collecting box 504 is provided with a rotating groove matching the rotating trajectory of the second connecting rod 508, and the interior of the collecting box 504 is provided with a limiting moving groove matching the first rack 509, the second rack 511 and the second U-shaped rod 512, and one side of the spur gear 510 is rotatably connected to the inner wall of the collecting box 504 through a rotating shaft.

[0035] In this embodiment: when the smoke is discharged, the first moving block 411 moves upward to drive the connecting block 501 to move upward, the connecting block 501 moves to drive the first connecting rod 502 to move horizontally, the first connecting rod 502 moves to drive the first U-shaped rod 503 to move horizontally, the first U-shaped rod 503 moves to drive the fixed block 506 to move, the fixed block 506 moves to drive the sliding block 507 to move, the sliding block 507 moves to squeeze the second connecting rod 508 to rotate, the second connecting rod 508 rotates to drive the first rack 509 to move horizontally, the first rack 509 moves to drive the spur gear 510 to rotate counterclockwise, the spur gear 510 rotates to drive the second rack 511 to move, and the second rack 511 moves to drive When the second U-shaped rod 512 moves, the second U-shaped rod 512 moves to drive the second moving block 513 to move, and the second moving block 513 moves to block the dust inlet at one end of the collection box 504. When the second connecting rod 508 rotates counterclockwise to a tilted state, the sliding block 507 moves toward the inside of the fixed block 506 under the pressure of the second connecting rod 508, and the second spring 514 is squeezed. When the sliding block 507 is separated from the second connecting rod 508, the second spring 514 resets and drives the sliding block 507 to reset. Since the fixed block 506 is provided with two, the first U-shaped rod 503 moves and drives the piston 505 to move at the same time. When the piston 505 moves to one end inside the collection box 504, the other end A fixed block 506 moves to the inclined end of the second connecting rod 508. When the first moving block 411 is reset, the connecting block 501 is reset and moves, and the first U-shaped rod 503 is driven to reset and move through mechanical transmission. The reset movement of the first U-shaped rod 503 drives another fixed block 506 to reset and move. The fixed block 506 moves to drive the sliding block 507 to move. The sliding block 507 moves and squeezes the second connecting rod 508 to reset and rotate. The second connecting rod 508 resets and rotates to drive the second moving block 513 to reset and move through mechanical transmission. The second moving block 513 moves and opens the dust inlet at one end of the collection box 504. At the same time, the first U-shaped rod 503 moves to drive the piston 505 to reset and move. The piston 505 is reset and moves to absorb the dust filtered inside the smoke outlet pipe 6. When the piston 505 is reset, the fixed block 506 close to the piston 505 moves to the inclined end of the second connecting rod 508. This structure is conducive to the timely collection of the dust filtered in the smoke outlet pipe 6, and avoids the situation where there is too much dust in the smoke outlet pipe 6 and reduces the filtering effect. It should be supplemented that a one-way valve is provided at the top of the collection box 504, and the one-way valve is connected to the outside air through an air guide hole. The air guide hole passes through the inner wall of the smoke outlet pipe 6 and is connected to the outside air. The bottom end of the collection box 504 is provided with a sealed discharge plate, and the inner wall of the smoke outlet pipe 6 is provided with an outlet for dust to be discharged after the discharge plate is opened.

[0036] What has been described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field of coal furnace dust treatment technology of this technology, within the technical scope disclosed by the present invention, can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dust treatment device for a coal-fired boiler, comprising a coal furnace shell, a smoke guide pipe is arranged at one end of the coal furnace shell, a fan is arranged at one end of the smoke guide pipe, a smoke outlet pipe is arranged on one side of the fan, a smoke guide plate is fixed inside the smoke outlet pipe by welding, and a through hole for smoke exhaust is arranged at the top of the smoke guide plate, characterized in that: The filtering mechanism comprises a first filter plate arranged at the top end of the smoke outlet pipe, the bottom end of the first filter plate is rotatably connected with a rotating disk through a bearing, the bottom end of the rotating disk is fixed with a rotating rod through welding, the outer wall of the rotating rod is provided with an activated carbon plate, the bottom end of the rotating rod is sleeved with a moving rod, the outer wall of the moving rod is sleeved with a fixed column, the outer wall of the fixed column is fixedly connected with a second filter plate, the bottom end of the moving rod is fixed with a rotating rod penetrating to the outside of the fixed column through welding, and the bottom end of the rotating rod is fixed with a first moving block for blocking the top opening of the smoke guide plate through welding; The collecting mechanism comprises a collecting box arranged at both ends of the smoke outlet pipe, a dust inlet is arranged at one end of the collecting box, and a second moving block for blocking the dust inlet is arranged at one end of the collecting box; The filter mechanism also includes a first spring arranged at the top end of the rotating rod, and the outer wall of the rotating disk is connected with symmetrically distributed cleaning brushes, and the top end of the cleaning brush is in contact with the bottom end of the first filter plate; The outer wall of the moving rod is provided with a ball bearing, and the inner wall of the rotating rod is formed with an annular groove matching the convex block on the outer wall of the moving rod; The collecting mechanism also includes a connecting block fixed to the top of the first moving block by welding, one end of the connecting block is rotatably connected to the first connecting rod, one end of the first connecting rod is rotatably connected to the first U-shaped rod extending to the outside of the smoke outlet pipe, one end of the first U-shaped rod penetrates into the interior of the collecting box, and one end of the first U-shaped rod is provided with a piston that fits the inner wall of the collecting box, the top of the first U-shaped rod is fixed with a fixed block by welding, the top of the fixed block is sleeved with a sliding block, a second connecting rod is provided inside the collecting box, the second connecting rod is located between the sliding block and the piston, one end of the second connecting rod is rotatably connected to the first rack, the bottom end of the first rack is meshed with a spur gear, the bottom end of the spur gear is meshed with a second rack, the bottom end of the second rack is provided with a second U-shaped rod fixedly connected to one end of the second moving block, and a second spring is provided at the bottom end of the sliding block; Two fixed blocks are provided, one of which is located inside the collection box, and the other is located outside the collection box, and one end of the collection box is provided with a through groove matching the moving tracks of the fixed block and the sliding block, the top end of the sliding block and the bottom end of the second connecting rod are arranged in an arc shape, and the interior of the fixed block is provided with a moving groove matching the sliding block; A rotating groove matching the rotating track of the second connecting rod is arranged inside the collection box, and a limiting movable groove matching the first rack, the second rack and the second U-shaped rod is arranged inside the collection box. One side of the spur gear is rotatably connected to the inner wall of the collection box through a rotating shaft.

2. The dust treatment device for a coal-fired boiler according to claim 1, characterized in that: A seal is provided at the connection between the bottom end of the first filter plate and the smoke outlet pipe, and a seal is provided at the connection between the activated carbon plate, the second filter plate and the inner wall of the smoke outlet pipe.

3. The dust treatment device for a coal-fired boiler according to claim 1, characterized in that: The rotating rod is rotatably connected to the activated carbon plate through a bearing, and a sealing member is provided at the connection between the rotating rod and the activated carbon plate.

4. The dust treatment device for a coal-fired boiler according to claim 1, characterized in that: A sealing member is provided at the contact position between the smoke outlet pipe and the first U-shaped rod.

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