A boiler flue for a gas filtering device

Abstract

The utility model relates to flue gas filter device technical field, concretely is a kind of boiler flue for gas filter device, including treatment room, the both ends of treatment room are respectively detachably installed with first sealing plate and second sealing plate, wherein first sealing plate, second sealing plate and treatment room are arranged heat-resistant sealing pad between, first sealing plate is installed with air inlet pipe, second sealing plate is installed with air outlet pipe, wherein air inlet pipe and boiler flue are communicated, flue gas in flue is filtered after along air inlet pipe passing through treatment room, then is discharged from air outlet pipe, knock position is periodically beaten intercepting net lower surface by rotating shaft driving knock piece, can promptly shake off the large particle sundries adhered on the surface of intercepting net, effectively prevent sundries to block the mesh of intercepting net.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas filtration devices, and in particular to a boiler flue gas filtration device. Background Technology

[0002] During the operation of industrial boilers, the high-temperature flue gas generated by fuel combustion typically contains a large amount of solid particulate matter, among which large ash particles pose a serious threat to subsequent flue gas treatment systems. Currently, to protect the expensive catalysts in core equipment such as SCR denitrification reactors, the industry generally installs interception nets between the boiler flue and the denitrification device. These nets use structures such as metal screens to intercept large particles of debris, preventing them from impacting the catalyst and causing blockage, failure, or physical wear. This is a crucial step in maintaining the efficiency of the denitrification system and the lifespan of the equipment.

[0003] However, under the harsh conditions of high temperature and high dust in boilers, existing interception nets are prone to clogging caused by large particles of ash and fibrous impurities in the flue gas accumulating at the mesh openings. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a gas filtration device for boiler flues.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a gas filtration device for a boiler flue includes a treatment chamber with a horizontal columnar structure. A first sealing plate and a second sealing plate are detachably fitted at both ends of the treatment chamber. The first sealing plate is adapted to the inlet port of the treatment chamber, and the second sealing plate is adapted to the outlet port of the treatment chamber. A heat-resistant sealing gasket is sandwiched between the inner sidewall of the first sealing plate and the inner sidewall of the second sealing plate and the end faces of the treatment chamber, respectively. The outer periphery of the heat-resistant sealing gasket is in contact with the inner wall of the treatment chamber. An inlet pipe is installed through the center of the first sealing plate along the axial direction of the treatment chamber. One end of the inlet pipe extends into the interior of the treatment chamber, and the other end is used for sealed communication with the outlet of the boiler flue. An outlet pipe is installed through the center of the second sealing plate along the axial direction of the treatment chamber. One end of the outlet pipe extends into the interior of the treatment chamber, and the other end is used for exhausting gas outwards. The flue gas discharged from the boiler flue can enter the interior of the treatment chamber along the inlet pipe, be filtered by the treatment chamber, and then be discharged along the outlet pipe.

[0006] Preferably, an intercepting net is fixedly installed radially inside the processing chamber. The outer periphery of the intercepting net is sealed and fitted to the inner wall of the processing chamber. The intercepting net is located on the flue gas flow path between the inlet pipe and the outlet pipe. The flue gas entering the processing chamber through the inlet pipe must pass vertically through the mesh surface of the intercepting net. The intercepting net can intercept large particles in the flue gas with a particle size larger than its mesh opening.

[0007] Preferably, a horizontal slot is provided on the side wall of the treatment chamber near its bottom. A ash storage box is slidably inserted into the slot in the horizontal direction. The opening of the ash storage box faces upward, and a heat-resistant pad is sandwiched between the outer peripheral wall of the ash storage box and the inner wall of the slot. An inclined ash guide plate is fixedly installed inside the treatment chamber below the interception net. The high end of the ash guide plate is fixedly connected to the inner wall of the treatment chamber, and the low end extends directly above the upper opening of the ash storage box. A handle is fixedly installed on the surface of the end of the ash storage box that extends out of the treatment chamber. Dust falling from the interception net can slide down the inclined surface of the ash guide plate into the ash storage box.

[0008] Preferably, the processing chamber is provided with a striking part below the intercepting net. The striking end of the striking part can periodically abut and strike the lower surface of the intercepting net to shake off large particles of debris adhering to the surface of the intercepting net. The shaken-off large particles of debris can slide down the inclined surface of the ash guide plate into the ash storage box.

[0009] Preferably, the striking part includes a rotating shaft and a striking plate. The rotating shaft is horizontally mounted on the inner wall of the processing chamber along the radial direction of the processing chamber, and the rotating shaft is located directly below the intercepting net. The striking plate is elongated, with one end fixedly connected to the outer peripheral wall of the rotating shaft. The striking plate can swing around the axis of the rotating shaft as the rotating shaft rotates, and during the swinging process, the free end of the striking plate can abut against and strike the lower surface of the intercepting net.

[0010] Preferably, a drive unit is fixedly installed on the outer wall of the processing chamber. The power output end of the drive unit extends into the interior of the processing chamber and is connected to the rotating shaft for transmission, so as to drive the rotating shaft to rotate around its own axis.

[0011] Preferably, the drive unit includes a striking motor, a rotating shaft, a half gear, two pulleys, and a synchronous belt. The striking motor is fixedly installed on the outer wall of the processing chamber by a bracket, and the output shaft of the striking motor is arranged in a horizontal direction. A heat insulation pad is sandwiched between the housing of the striking motor and the outer wall of the processing chamber. The rotating shaft rotates horizontally along the radial direction of the processing chamber and passes through the side wall of the processing chamber. One end of the rotating shaft is located outside the processing chamber, and the other end is located inside the processing chamber. The two pulleys are respectively fixedly sleeved on the outer circumference of the output shaft of the striking motor and the outer circumference of the rotating shaft located outside the processing chamber. The two pulleys are distributed along the same vertical plane. The synchronous belt is sleeved on the outer circumference of the two pulleys and forms a closed transmission structure. The half gear is fixedly sleeved on the outer circumference of the rotating shaft located inside the processing chamber. A transmission gear is fixedly sleeved on the outer wall of the rotating shaft. The transmission gear and the half gear are both located inside the processing chamber and mesh in a horizontal direction. The half gear can drive the transmission gear to rotate the rotating shaft as the rotating shaft rotates.

[0012] Preferably, a reset torsion spring is coaxially sleeved on the outer periphery of the rotating shaft. One end of the reset torsion spring is fixedly embedded in a preset groove in the inner wall of the processing chamber, and the other end is fixedly embedded in a preset slot in the side wall of the transmission gear. When the half gear disengages from the transmission gear, the reset torsion spring can release elastic potential energy and drive the rotating shaft to rotate in the opposite direction to reset, thereby driving the striking plate to reset to the initial position.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] In this invention, the striking part, driven by a rotating shaft, periodically strikes the lower surface of the interceptor mesh, effectively dislodging large particles of debris adhering to the mesh surface and preventing them from clogging the mesh openings. Without this striking structure, large particles of debris would gradually accumulate on the surface of the interceptor mesh and clog the openings, leading to increased resistance to flue gas flow, reduced flue gas flow through the mesh, and even some flue gas failing to pass through, thus significantly reducing the mesh's filtration capacity for impurities in the flue gas. Continuous striking prevents clogging, ensuring the mesh openings remain clear and allowing flue gas entering the treatment chamber to pass smoothly through the mesh, enabling the mesh to continuously and stably intercept large particles of debris in the flue gas. Attached Figure Description

[0015] Figure 1 This utility model provides a three-dimensional structural diagram of a boiler flue used for a gas filtration device;

[0016] Figure 2 This utility model provides a partial disassembly diagram of a boiler flue used for a gas filtration device;

[0017] Figure 3 This utility model proposes a boiler flue gas filtration device. Figure 1 Schematic diagram of the structure at point A in the middle.

[0018] Legend:

[0019] 1. Inlet pipe; 2. Processing chamber; 3. First sealing plate; 4. Second sealing plate; 5. Outlet pipe; 6. Ash storage box; 7. Handle; 8. Interception net; 9. Rotating shaft; 10. Striking motor; 11. Pulley; 12. Half gear; 13. Transmission gear; 14. Return torsion spring; 15. Striking plate; 16. Rotating shaft. Detailed Implementation

[0020] Please see Figure 1-3This utility model provides a technical solution: a gas filtration device for a boiler flue, including a treatment chamber 2. The treatment chamber 2 has a horizontal columnar structure with openings at both ends. A first sealing plate 3 and a second sealing plate 4 are respectively provided at the two ends of the treatment chamber 2. The first sealing plate 3 and the second sealing plate 4 are detachably connected to the end faces of the ports of the treatment chamber 2 by bolts. Heat-resistant sealing gaskets are sandwiched between the first sealing plate 3 and the ports of the treatment chamber 2, and between the second sealing plate 4 and the ports of the treatment chamber 2. The heat-resistant sealing gaskets are made of asbestos material to adapt to the high-temperature flue gas environment inside the treatment chamber 2 and prevent flue gas from leaking from the port gaps. An installation hole is opened at the center of the first sealing plate 3 along the axial direction of the treatment chamber 2. The inlet pipe 1 passes through the mounting hole and is fixedly connected to the first sealing plate 3. One end of the inlet pipe 1 extends into the interior of the treatment chamber 2 and the other end extends out of the first sealing plate 3. The end of the inlet pipe 1 extending out of the first sealing plate 3 is sealed to the outlet of the boiler flue through a flange to ensure that all the flue gas discharged from the boiler flue can enter the inlet pipe 1. The center of the second sealing plate 4 is also provided with a mounting hole along the axial direction of the treatment chamber 2. The outlet pipe 5 passes through the mounting hole and is fixedly connected to the second sealing plate 4. One end of the outlet pipe 5 extends into the interior of the treatment chamber 2 and the other end extends out of the second sealing plate 4. The end of the outlet pipe 5 extending out of the second sealing plate 4 can be connected to the subsequent exhaust pipe to discharge the filtered flue gas. An intercepting net 8 is installed radially inside the treatment chamber 2. An annular groove is provided on the inner wall of the treatment chamber 2 corresponding to the installation position of the intercepting net 8. The outer periphery of the intercepting net 8 is fixed in the annular groove. The intercepting net 8 is made of metal woven mesh, and the mesh size can be set according to the common particle size of large particles in the boiler flue gas. The intercepting net 8 is located on the flue gas flow path between the inlet pipe 1 and the outlet pipe 5, so that the flue gas entering the treatment chamber 2 through the inlet pipe 1 must pass vertically through the mesh surface of the intercepting net 8 before flowing to the outlet pipe 5. In this way, the intercepting net 8 can effectively intercept large particles in the flue gas with a particle size larger than its mesh size.A horizontal slot is provided near the bottom of the side wall of the treatment chamber 2, penetrating the side wall of the treatment chamber 2. Two parallel guide strips are provided on the inner wall of the slot. Guide grooves are provided on the side walls of the ash storage box 6 corresponding to the positions of the guide strips. The ash storage box 6 slides into the slot through the cooperation of the guide grooves and guide strips. The top of the ash storage box 6 is open, facing the interior of the treatment chamber 2. A heat-resistant pad made of silicone is sandwiched between the outer peripheral wall of the ash storage box 6 and the inner wall of the slot to ensure the sealing performance between the ash storage box 6 and the treatment chamber 2, preventing flue gas leakage from the slot. The interior of the treatment chamber 2 is located within the interception net 8. A dust guide plate is fixedly installed below the ash storage box 6. One end of the dust guide plate is fixed to the inner wall of the treatment chamber 2 near the bottom of the interception net 8 by welding. The other end of the dust guide plate extends at an angle towards the ash storage box 6 and extends directly above the upper opening of the ash storage box 6. The upper surface of the dust guide plate is a smooth surface so that the dust can slide off smoothly. A handle 7 is fixedly installed on the surface of the end of the ash storage box 6 that extends outside the treatment chamber 2. The handle 7 is a U-shaped structure made of metal and is connected to the ash storage box 6 by welding. The operator can pull the ash storage box 6 by holding the handle 7 to remove and install the ash storage box 6 in order to clean the dust collected inside. Inside the treatment chamber 2, below the interception net 8, there is a striking part, which includes a rotating shaft 16 and a striking plate 15. Two opposing bearing seats are fixedly installed on the inner wall of the treatment chamber 2 corresponding to the installation position of the rotating shaft 16. Each bearing seat contains a bearing. The two ends of the rotating shaft 16 are respectively inserted into the inner rings of the two bearings to achieve rotational installation. The rotating shaft 16 is arranged radially along the treatment chamber 2 and located directly below the interception net 8. The striking plate 15 is made of elastic metal sheet. One end of the striking plate 15 is fixedly connected to the outer peripheral wall of the rotating shaft 16 by welding. The length of the striking plate 15 is set so that when the rotating shaft 16 rotates, the free end of the striking plate 15 can abut against and strike the lower surface of the interception net 8. The striking action shakes off large particles of debris adhering to the surface of the interception net 8. The shaken-off large particles of debris fall onto the guide plate below under the action of gravity and slide down the inclined surface of the guide plate into the ash storage box 6.A drive unit is fixedly installed on the outer wall of the treatment chamber 2. This drive unit includes a striking motor 10, a rotating shaft 9, a half-gear 12, two pulleys 11, and a synchronous belt. The striking motor 10 is a high-temperature resistant motor, fixedly mounted on the outer wall of the treatment chamber 2 via a bracket made of angle steel and welded to the outer wall. A heat insulation pad, made of ceramic fiber, is sandwiched between the housing of the striking motor 10 and the outer wall of the treatment chamber 2 to prevent the high temperature transmitted from the treatment chamber 2 and protect the striking motor 10 from overheating. A mounting hole is provided on the side wall of the treatment chamber 2 corresponding to the mounting position of the rotating shaft 9. A sealed bearing is installed in this mounting hole. One end of the rotating shaft 9 passes through the sealed bearing and extends into the interior of the treatment chamber 2, while the other end is located outside the treatment chamber 2. The sealed bearing prevents the flue gas inside the treatment chamber 2 from leaking through the gap between the rotating shaft 9 and the side wall of the treatment chamber 2. The two pulleys 11 are respectively connected to… A keyed connection is used to fix the outer circumference of the output shaft of the striking motor 10 and the outer circumference of the rotating shaft 9 located outside the processing chamber 2. Two pulleys 11 are distributed along the same vertical plane. A synchronous belt is fitted around the outer circumference of the two pulleys 11 to form a closed transmission structure. The synchronous belt is made of rubber to ensure the stability of the transmission. A half gear 12 is fixedly fitted around the outer circumference of the rotating shaft 9 located inside the processing chamber 2 via a keyed connection. A transmission gear 13 is fixedly fitted around the outer circumference of the rotating shaft 16 via a keyed connection. The transmission gear 13 and the half gear 12 are both located inside the processing chamber 2 and mesh in the horizontal direction. Only a portion of the circumference of the half gear 12 is provided with teeth. When the half gear 12 rotates with the rotating shaft 9, its toothed portion can mesh with the transmission gear 13 to drive the transmission gear 13 to drive the rotating shaft 16 to rotate. When the toothless portion of the half gear 12 rotates to a position opposite to the transmission gear 13, the two disengage. A reset torsion spring 14 is coaxially sleeved on the outer periphery of the rotating shaft 16. A preset groove is provided on the inner wall of the processing chamber 2 corresponding to the fixed position of one end of the reset torsion spring 14. One end of the reset torsion spring 14 is embedded in the preset groove for fixation. A preset slot is provided on the side wall of the transmission gear 13 corresponding to the fixed position of the other end of the reset torsion spring 14. The other end of the reset torsion spring 14 is embedded in the preset slot for fixation. When the toothed part of the half gear 12 meshes with the transmission gear 13 and drives the rotating shaft 16 to rotate, the reset torsion spring 14 is twisted and stores elastic potential energy. When the toothless part of the half gear 12 disengages from the transmission gear 13, the reset torsion spring 14 releases elastic potential energy and drives the rotating shaft 16 to rotate in the opposite direction to reset, thereby driving the striking piece 15 to reset to the initial position for the next striking action.

[0021] Working principle: The flue gas discharged from the boiler flue first enters the treatment chamber 2 through the inlet pipe 1 connected by the flange. The flue gas entering the treatment chamber 2 flows axially towards the interception net 8 and passes vertically through the mesh surface of the interception net 8. During this process, the interception net 8 intercepts large particles in the flue gas with a particle size larger than its mesh opening. The large particles are blocked on the inlet side surface of the interception net 8. At the same time, the striking motor 10 starts. The output shaft of the striking motor 10 drives the pulley 11 fixed to it to rotate. The pulley 11 drives the pulley 11 on the rotating shaft 9 to rotate through the synchronous belt, which in turn drives the rotating shaft 9 to rotate. The rotating shaft 9 drives the half gear 12 at its end to rotate synchronously. When the teeth of the half gear 12 mesh with the transmission gear 13, it drives the transmission gear 13 to drive the rotating shaft 16 to rotate. The striking plate 15 on the rotating shaft 16 rotates with the rotating shaft 16 and strikes the lower surface of the interception net 8 upward, shaking off the large particles of debris adhering to the surface of the interception net 8. Large particles of debris shaken off fall onto the guide plate below under gravity and slide down the inclined surface of the guide plate into the ash collection box 6 for collection. When the toothless part of the half gear 12 rotates to the position opposite to the transmission gear 13, the two disengage. At this time, the reset torsion spring 14 on the rotating shaft 16 releases elastic potential energy to drive the rotating shaft 16 to rotate in the opposite direction to reset, driving the striking plate 15 back to its initial position. This cycle is repeated to periodically strike the interception net 8 to prevent blockage. The clean flue gas filtered by the interception net 8 continues to flow axially along the treatment chamber 2 and finally exits the treatment chamber 2 through the exhaust pipe 5 into the subsequent exhaust pipe. When the large particles of debris collected in the ash collection box 6 reach a certain amount, the operator can hold the handle 7 at the outer end of the ash collection box 6 and pull the ash collection box 6 out along the slot on the side wall of the treatment chamber 2 to clean the internal debris. Then, the ash collection box 6 is slid back into the slot. The heat-resistant gasket between the ash collection box 6 and the slot ensures the sealing performance and ensures the continuous and stable operation of the device.

Claims

1. A boiler flue gas filtration device, comprising a treatment chamber (2), characterized in that: The two ends of the treatment chamber (2) are respectively detachably equipped with a first sealing plate (3) and a second sealing plate (4). A heat-resistant sealing gasket is provided between the first sealing plate (3), the second sealing plate (4) and the treatment chamber (2). An air inlet pipe (1) is installed on the first sealing plate (3), and an air outlet pipe (5) is installed on the second sealing plate (4). The air inlet pipe (1) is connected to the boiler flue. The flue gas in the flue passes through the treatment chamber (2) along the air inlet pipe (1) and is then filtered before being discharged from the air outlet pipe (5).

2. A boiler flue gas filtration device according to claim 1, characterized in that: The processing chamber (2) is equipped with an interception net (8). The flue gas passing through the processing chamber (2) passes through the interception net (8), which intercepts large particulate matter in the flue gas.

3. A boiler flue gas filtration device according to claim 2, characterized in that: A dust storage box (6) is slidably installed on the side of the treatment chamber (2) near the bottom. An inclined dust guide plate is installed inside the treatment chamber (2). The dust guide plate can guide the falling dust into the upper opening of the dust storage box (6). A handle (7) is fixedly installed on the surface of the dust storage box (6). A heat-resistant pad is installed between the dust storage box (6) and the treatment chamber (2) for sealing.

4. A boiler flue gas filtration device according to claim 3, characterized in that: The processing chamber (2) is equipped with a striking part, which can strike the surface of the interception net (8) to shake off large particles of debris adhering to the surface of the interception net (8). The large particles of debris shaken off fall along the ash guide plate into the ash storage box (6).

5. A boiler flue gas filtration device according to claim 4, characterized in that: The striking part includes a rotating shaft (16), which is rotatably installed inside the processing chamber (2). A striking plate (15) is fixedly connected to the surface of the rotating shaft (16), wherein the rotating shaft (16) drives the striking plate (15) to strike the interception net (8) during rotation.

6. A boiler flue gas filtration device according to claim 5, characterized in that: The surface of the processing chamber (2) is equipped with a drive unit, which drives the rotating shaft (16) to rotate.

7. A boiler flue gas filtration device according to claim 6, characterized in that: The drive unit includes a striking motor (10) fixed on the processing chamber (2), a heat insulation pad is provided between the striking motor (10) and the processing chamber (2), a rotating shaft (9) is rotatably mounted on the processing chamber (2), a half gear (12) is fixedly connected to the surface of the rotating shaft (9), pulleys (11) are fixedly mounted on the output shaft of the striking motor (10) and the surface of the rotating shaft (9), the two pulleys (11) are connected by a synchronous belt drive, a transmission gear (13) is fixedly connected to the surface of the rotating shaft (16), and the transmission gear (13) meshes with the half gear (12).

8. A boiler flue gas filtration device according to claim 7, characterized in that: A reset torsion spring (14) is fitted on the surface of the rotating shaft (16). One end of the reset torsion spring (14) is fixed to the processing chamber (2), and the other end of the reset torsion spring (14) is fixed to the transmission gear (13).

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