Moving electrode type electrostatic precipitator brush, moving electrode type electrostatic precipitator, and method for installing a moving electrode type electrostatic precipitator brush

Abstract

To provide a brush for a mobile electrode type electric dust collector capable of facilitating replacement operation of the brush which is installed along dust collection plates, to provide a mobile electrode type electric dust collector and to provide a brush installation method of the mobile electrode type electric dust collector.SOLUTION: Brushes 10 for a mobile electrode type electric dust collector are installed along dust collection plates of the mobile electrode electric dust collector. The brush 10 for a mobile electrode type electric dust collector includes: a shaft part 11 which is provided in parallel with respect to the dust collection plate; bristles 12 which are set up on an outer circumferential surface of the shaft part 11 and can remove dust attached to the dust collection plate; and support parts 13 which are provided at end parts of the shaft part 11, respectively and are supported on bearings 21, respectively. Therein, the end parts of the shaft part 11 and end parts of the support part 13 are constituted so as to be connectable with / connection-releasable from each other.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a brush for a moving electrode electrostatic precipitator, a moving electrode electrostatic precipitator, and a method for installing a brush for a moving electrode electrostatic precipitator. [Background technology]

[0002] In a moving-electrode electrostatic precipitator, the dust collecting plate that constitutes the dust collecting electrode moves vertically and rotates around the discharge electrode, while a high voltage is applied to the discharge electrode, causing a corona discharge that charges the dust, causing the dust to be collected on the collecting electrode.A brush is installed near the bottom of the collecting electrode, and the brush brushes off the dust that has adhered to the dust collecting plate.

[0003] Brushing off dust with a brush in a moving electrode electrostatic precipitator reduces poor dust detachment and scattering downstream, improving dust collection performance compared to the hammering method used in fixed electrode electrostatic precipitators, in which a hammer strikes the dust collecting plate.

[0004] The dust collecting plates of a moving electrode electrostatic precipitator are long in the horizontal direction and multiple plates are arranged vertically. Endless chains are attached to both horizontal ends (left and right ends) of the dust collecting plates, and the dust collecting plates are supported by the endless chains. Sprocket wheels with which the endless chains mesh are arranged at the upper and lower ends of the moving electrode electrostatic precipitator, and the endless chains go around the two sprocket wheels. As the dust collecting plates move along the sprocket wheels arranged at the upper or lower end, the installation direction changes from vertical to horizontal and then back to vertical.

[0005] The brush used to remove dust from the dust collecting plate is located inside the hopper at the bottom of the dust collector. Because it is positioned to avoid the gas flow, it reduces the amount of dust that scatters when the dust is removed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-22487 Summary of the Invention [Problem to be solved by the invention]

[0007] The brush has a shaft, bristles attached to the outer surface of the shaft that scrape dust off the dust collecting plate, and support parts attached to both ends of the shaft. The shaft and support parts are connected and integrated by welding. Brushes are available in two types: a rotating type that rotates around its axis when torque is transmitted from a drive unit connected to one end, and a fixed type that does not receive torque from the drive unit. In the rotating type, the support parts on both sides of the brush are supported by bearings.

[0008] The tips of the brush bristles wear down due to friction with the dust collecting plates and dust, so it is common to replace the entire brush, including the shaft and support, during periodic inspections.The length of the brush is the same as that of the long dust collecting plates, and replacement of the brush is time-consuming and labor-intensive, as the work must be done in the narrow space between the plates.

[0009] Because the length of the brush is longer than the distance between the two bearings, the bearings must be removed before replacing the brush. Furthermore, because the brush is long, the replacement work requires removing walls or ceilings and setting up scaffolding. While not an example of brush replacement, for example, Patent Document 1 above discloses a method in which an opening is formed in the ceiling surface of the casing of an electrostatic precipitator, and some of the elements that make up the electrode plate are removed from the electrode plate and carried out through the opening.

[0010] The present disclosure has been made in consideration of the above circumstances, and aims to provide a brush for a moving electrode type electrostatic precipitator, a moving electrode type electrostatic precipitator, and a method for installing brushes for a moving electrode type electrostatic precipitator, which makes it possible to easily replace brushes installed along a dust collecting plate. [Means for solving the problem]

[0011] The brush of a moving electrode type electrostatic precipitator according to the present disclosure is a brush of a moving electrode type electrostatic precipitator that is installed along the dust collecting plate of the moving electrode type electrostatic precipitator, and comprises a shaft portion that is provided parallel to the dust collecting plate, a removal portion that is attached to the outer circumferential surface of the shaft portion and is capable of removing dust that has adhered to the dust collecting plate, and a support portion that is provided at the end of the shaft portion and is supported by a bearing, and the end of the shaft portion and the end of the support portion are configured to be connectable and disconnectable to each other. The shaft portion is provided with a first flange that protrudes radially outward from an end of the shaft portion, and the outermost peripheral end of the removed portion is located radially inward from an outer peripheral surface of the first flange or at the same position as the outer peripheral surface of the first flange. .

[0012] The moving-electrode electrostatic precipitator according to the present disclosure comprises a dust collecting plate of the moving-electrode electrostatic precipitator, a brush of the above-described moving-electrode electrostatic precipitator installed along the dust collecting plate, and a bearing supporting the brush.

[0013] The brush installation method for a moving electrode type electrostatic precipitator according to the present disclosure is a method for installing a brush to be installed along the dust collecting plate of the moving electrode type electrostatic precipitator, the brush comprising a shaft portion arranged parallel to the dust collecting plate, a removal portion attached to the outer peripheral surface of the shaft portion and capable of removing dust adhering to the dust collecting plate, and a support portion provided at the end of the shaft portion and supported by a bearing, the shaft portion having a first flange protruding radially outward from the end of the shaft portion, and the support portion having a second flange connectable to the first flange and protruding radially outward from the end of the support portion, the brush installation method for a moving electrode type electrostatic precipitator comprising the steps of installing the transported shaft portion along the dust collecting plate, supporting the support portion on a bearing, and connecting the shaft portion and the support portion via the first flange and the second flange. [Effects of the Invention]

[0014] According to the present disclosure, it is possible to easily replace brushes installed along the dust collecting plate, thereby shortening the time required for the replacement work compared to conventional methods and improving safety. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view illustrating a moving electrode electrostatic precipitator according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a front view showing a brush and bearing of a moving electrode electrostatic precipitator according to an embodiment of the present disclosure. [Figure 3] FIG. 2 is a partially enlarged front view showing a brush of a moving electrode type electrostatic precipitator according to an embodiment of the present disclosure. [Figure 4] FIG. 2 is a longitudinal cross-sectional view showing a connection portion between a brush shaft and a support portion of a moving electrode type electrostatic precipitator according to an embodiment of the present disclosure. [Figure 5] FIG. 2 is a cross-sectional view showing the inside of a casing of a moving electrode type electrostatic precipitator according to an embodiment of the present disclosure. [Figure 6] FIG. 10 is a front view showing a modified example of the brush of the moving electrode type electrostatic precipitator according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0016] A moving electrode type electrostatic precipitator 1 according to an embodiment of the present disclosure will be described below with reference to the drawings. The moving-electrode electrostatic precipitator 1 is installed in an exhaust gas treatment facility located in a flue downstream of an industrial combustion facility such as a thermal power plant or an incinerator. In the moving-electrode electrostatic precipitator 1, a dust collecting electrode 3 has multiple movable dust collecting plates 4, and dust (particulate matter) adhering to the surfaces of the dust collecting plates 4 is brushed off by a brush 10 provided below. The moving-electrode electrostatic precipitator 1 may be housed in the same casing 20 (see FIG. 5) as a fixed-electrode electrostatic precipitator in which the position of the dust collecting electrode is fixed, and may be arranged in series along the gas flow direction, or may be used independently.

[0017] As shown in Fig. 1, the moving electrode electrostatic precipitator 1 includes a discharge electrode 2, a collection electrode 3, and a drive mechanism 5 that moves a collection plate 4 of the collection electrode 3, all arranged inside a casing 20. A plurality of moving electrode electrostatic precipitators 1 are installed inside the casing 20, lined up horizontally and perpendicular to the gas flow.

[0018] The casing 20 has a gas inlet and a gas outlet, for example, on two opposing side surfaces, and a gas flow path through which gas flows horizontally is formed inside. The gas outlet is formed by a throttle duct 23. A hopper 24 is provided at the bottom of the casing 20 to collect dust that has been captured by the dust collection electrode 3 and brushed off by the brush 10.

[0019] The discharge electrodes 2 have, for example, discharge wires, and a plurality of them are arranged in the gas flow direction. The discharge wires of the discharge electrodes 2 are arranged at regular intervals in positions facing the plate surface of the dust collecting plate 4 of the dust collecting electrode 3. As shown in FIG. 1, some discharge electrodes 2 are arranged inside the loop formed by the dust collecting electrodes 3, and some, not shown, are arranged between the dust collecting electrodes 3 of adjacent moving-electrode electrostatic precipitators 1.

[0020] The dust collecting plate 4 of the dust collecting electrode 3 is a metal plate-shaped member and is installed opposite the discharge electrode 2. The plate surfaces (front and back surfaces) of the dust collecting plate 4 are arranged approximately parallel to the direction of gas flow at the gas inlet of the casing. The width of the dust collecting plate 4 is, for example, 3 m to 5 m.

[0021] The discharge wires of the discharge electrode 2 are placed opposite the collection electrode 3 so that the area affected by the corona discharge is appropriately distributed on the collection plate 4 of the collection electrode 3. For example, the discharge wires are evenly arranged in the width direction of the opposing collection electrode 3. Furthermore, because the discharge electrodes 2 are arranged side by side in the depth direction, particulate matter that is not captured in the discharge region on the front side can be charged and collected in the discharge region on the back side.

[0022] The discharge electrode 2 and the collection electrode 3 are spaced apart and electrically insulated from each other. The discharge electrode 2 is connected to a high-voltage power supply (not shown). When a high voltage is applied to the discharge electrode 2, a corona discharge occurs at the discharge electrode 2. The corona discharge charges dust particles in the air, and the charged dust particles are attracted to the collection electrode 3 by Coulomb force and collected on the collection electrode 3.

[0023] The dust collecting electrode 3 has a plurality of dust collecting plates 4, which are arranged in the vertical direction. The dust collecting plates 4 have a rectangular shape, with the long side extending in the depth direction and the short side extending in the height direction.

[0024] The drive mechanism 5 comprises an endless chain 7, sprocket wheels 8, a motor (not shown), etc. An endless chain 7 is provided at both horizontal ends (left and right ends) of the dust collecting plate 4, and the dust collecting plate 4 is supported by the endless chain 7. A plurality of dust collecting plates 4 are arranged along a pair of circular endless chains 7. Sprocket wheels 8, with which the endless chain 7 meshes, are provided at the upper and lower ends of the dust collecting electrode 3, and the endless chain 7 travels around the two sprocket wheels 8. The endless chain 7 may be formed of a roller chain or another type of chain, for example a link chain.

[0025] The upper sprocket wheel 8 is connected to a motor via a rotating shaft 8A and transmits the rotational force of the motor to the endless chain 7. The lower sprocket wheel 8 rotates around the rotating shaft 8A as the meshed endless chain 7 moves. Multiple dust collecting plates 4 are arranged in two vertical rows between the upper and lower sprocket wheels 8.

[0026] As the dust collecting plate 4 moves along the outer periphery of the sprocket wheel 8 located at the upper or lower end, the installation direction of the dust collecting plate 4 changes from vertical to horizontal and then back to vertical, resulting in the upper and lower ends of the dust collecting plate 4 being reversed.

[0027] A brush 10 capable of coming into contact with the dust collecting plate 4 is installed below the dust collecting electrode 3. The brush 10 is arranged along the longitudinal direction of the dust collecting plate 4, from one end to the other end of the dust collecting plate 4. Since dust adheres to both surfaces of the dust collecting plate 4, a brush 10 is installed on each surface of the dust collecting plate 4.

[0028] The brush 10 has bristles arranged cylindrically and is rotatable around the axis of the cylindrical brush 10. In this case, the brush 10 is rotated by a motor (not shown), and when the dust collection electrode 3 moves from bottom to top, the brush 10 rotates so as to move from top to bottom on the dust collection plate 4 side. The brush 10 comes into contact with the moving dust collection plate 4, thereby brushing off dust adhering to the surface of the dust collection plate 4. The dust brushed off by the brush 10 is collected in a hopper 24.

[0029] Next, the configuration of the brush 10 according to this embodiment will be described with reference to FIGS. As shown in FIG. 2, the brush 10 is composed of a shaft 11, bristles 12, and a support 13. The brush 10 is longer than the width of the dust collecting plate 4. This allows one brush 10 to remove dust adhering to the surface of one dust collecting plate 4 from one end to the other. In the brush 10, the shaft 11 and the support 13 are configured to be connectable and disconnectable to each other. Therefore, because the shaft 11 and the support 13 can be easily separated, the brush 10, which is supported by bearings 21 at both ends, can be easily replaced.

[0030] The shaft 11 has a hollow central portion, e.g., a cylindrical member. This reduces the weight of the brush 10, which has a length corresponding to the length of the dust collecting plate 4, and reduces or prevents deflection of the shaft 11 due to load. Support portions 13 are provided on both ends of the shaft 11, and the shaft 11 and support portions 13 are connected to each other via a first flange 14 and a second flange 15.

[0031] A first flange 14 is provided on each of the opposite end portions of the shaft portion 11. The first flange 14 protrudes radially outward from the end portion of the shaft portion 11, and is, for example, a member having a circular ring shape.

[0032] The end of the shaft portion 11 may include a round steel bar 16. In this case, the round steel bar 16 at the end is inserted into the circular pipe 17 of the shaft portion 11. Bolt insertion holes are formed in the round steel bar 16 and the circular pipe 17 perpendicular to the axial direction, and the round steel bar 16 and the circular pipe 17 are fastened together with bolts and nuts inserted into the holes. The round steel bar 16 and the circular pipe 17 are also integrated by fillet welding at the end of the circular pipe 17. The round steel bar 16 and the first flange 14 of the shaft portion 11 are integrally joined, for example, by welding, and are difficult to separate.

[0033] The bristles 12 are attached to the outer peripheral surface of the shaft portion 11 and are capable of removing dust adhering to the dust collecting plate 4. The bristles 12 are an example of a removal portion. The removal portion according to the present disclosure is not limited to bristles, and may be any other member made of a porous material or the like as long as it can remove dust from the surface of the dust collecting plate 4. The bristles 12 are provided on the outer peripheral surface of the shaft portion 11 from one end to the other end of the shaft portion 11.

[0034] As shown in FIG. 6 , the bristles 12 may be arranged so that the outermost end of the bristles 12 is located radially inward of the outer circumferential surface of the first flange 14. As a result, when the brush 10 is placed on a mounting surface, the first flange 14 comes into contact with the mounting surface, and the bristles 12 do not come into contact with the mounting surface. Therefore, when replacing the brush 10, the bristles 12 will not be damaged when the brush 10 is temporarily placed or transported, and a temporary placement stand or the like to prevent damage to the bristles 12 is not required. The bristles 12 may be arranged so that the outermost end of the bristles 12 is located at the same position as the outer circumferential surface of the first flange 14. In this case, when the brush 10 is placed on a mounting surface, the bristles 12 will also come into contact with the mounting surface, but the load of the brush 10 will not be applied to the bristles 12 to an extent that would damage the bristles 12.

[0035] The support portion 13 is made of, for example, round steel and is solid. This prevents damage to the support portion 13 even if wear occurs due to contact with the bearing 21. The support portion 13 is supported by the bearing 21.

[0036] A second flange 15 is provided at one end 13a (see FIG. 4) of the support part 13. The second flange 15 is connectable to the first flange 14, and is a member having, for example, a ring shape, protruding radially outward at the end 13a of the support part 13. The round steel portion of the support part 13 and the second flange 15 are integrally joined, for example, by welding, and are difficult to separate.

[0037] The first flange 14 and the second flange 15 can be connected to each other by fitting their opposing surfaces together. As shown in Figures 3 and 4, the first flange 14 and the second flange 15 are connected by fastening bolts 18 and nuts 19. The first flange 14 and the second flange 15 are formed with holes for inserting the bolts.

[0038] The first flange 14 and the second flange 15 each have either a recess or a protrusion formed on their opposing surfaces so as to fit together. That is, as shown in FIG. 4 , when the first flange 14 has a circular protrusion 14a, the second flange 15 has a circular recess 15a formed to correspond to the protrusion 14a of the first flange 14. Alternatively, when the first flange 14 has a circular recess, the second flange 15 has a circular protrusion formed to correspond to the first flange 14. This prevents misalignment between the shaft portion 11 and the support portion 13 and facilitates alignment of the central axes of the shaft portion 11 and the support portion 13. The fitting portion between the recess 15a and the protrusion 14a has, for example, a spigot structure in which the protrusion 14a is housed inside the recess 15a. This brings the outer circumferential surface of the protrusion 14a into close contact with the inner circumferential surface of the recess 15a, more reliably preventing misalignment between the shaft portion 11 and the support portion 13 and aligning the central axes.

[0039] As shown in FIG. 4, the first flange 14 and the round steel bars 16 are connected so that the end 16a of the round steel bars 16 of the shaft portion 11 is offset toward the center of the shaft portion 11 from the end face of the first flange 14. Furthermore, the second flange 15 and the round steel portion are connected so that the end 13a of the round steel portion of the support portion 13 is offset toward the center of the support portion 13 from the end face of the second flange 15. This prevents the end 16a of the round steel bars 16 of the shaft portion 11 and the end 13a of the round steel portion of the support portion 13 from contacting each other when the first flange 14 and the second flange 15 are connected. Furthermore, as shown in FIG. 4, the inner surface 14b of the first flange 14 and the end 16a of the round steel bars 16 of the shaft portion 11 can be fillet welded, and the inner surface 15b of the second flange 15 and the end 13a of the round steel portion of the support portion 13 can be fillet welded.

[0040] In the above-described embodiment, the shaft portion 11 and the support portion 13 are configured to be connectable and disconnectable to each other via the first flange 14 and the second flange 15. However, the present disclosure is not limited to this example. For example, the first flange 14 and the second flange 15 may not be provided, and the end of the support portion 13 made of a round steel member may be inserted into the end of the shaft portion 11 made of a circular tubular member, and holes for inserting bolts may be formed in the shaft portion 11 and the support portion 13 in a direction perpendicular to the axial direction. In this case, the shaft portion 11 and the support portion 13 are not connected by welding, but are fastened together with bolts and nuts inserted into the holes.

[0041] Next, a description will be given of a method for installing the brush 10 in the moving-electrode electrostatic precipitator 1 according to this embodiment. This embodiment is applicable not only to the installation of a new moving-electrode electrostatic precipitator 1, but also to the replacement of the brush 10 in an existing moving-electrode electrostatic precipitator 1.

[0042] When the brush 10 is installed along the dust collecting plate 4, the brush 10 is divided and carried in with the shaft 11 and the support 13 separated. At this time, the shaft 11 has the bristles 12 attached to the outer periphery and the first flange 14 integrated with the end of the shaft 11. The support 13 has the second flange 15 integrated with the end 13a of the support 13.

[0043] The transported shaft portion 11 is arranged along the longitudinal direction of the dust collecting plate 4. Furthermore, the separately transported support portion 13 is inserted into the inside of a bearing 21 provided in the moving electrode type electrostatic precipitator 1 and is supported by the bearing 21. Then, the shaft portion 11 is inserted between the two support portions 13, and the first flange 14 of the shaft portion 11 and the second flange 15 of the support portion 13 are butted together so as to face each other. Thereafter, the first flange 14 and the second flange 15 are fastened together with bolts 18 and nuts 19, connecting the shaft portion 11 and the support portion 13.

[0044] Conversely, when removing the brush 10 from its installed state, the bolts 18 and nuts 19 are released to separate the first flange 14 and the second flange 15. This allows the shaft 11 to be removed from between the two support portions 13, and then the support portion 13 can be pulled out of the bearing 21. This separates the brush 10, and the brush 10 can be carried out with the shaft 11 and the support portion 13 separated.

[0045] When the support portion 13 is inserted inside the bearing 21 and supported by the bearing 21, the position of the second flange 15 of the support portion 13 is located closer to the shaft portion 11 than the position where the support portion 13 is supported by the bearing 21.

[0046] Conventionally, when the brush shaft and support are integrated by welding and the brush is longer than the distance between the two bearings 21, it is necessary to remove the bearing 21 from the moving electrode electrostatic precipitator. In contrast, the shaft 11 of the brush 10 according to this embodiment is located inside the space between the two bearings 21, and the length of the shaft 11 is shorter than the distance between the two bearings 21. Therefore, when replacing the brush 10, it is not necessary to remove the bearing 21 from the moving electrode electrostatic precipitator 1, and the brush 10 can be easily attached and removed along the dust collecting plate 4.

[0047] The moving electrode electrostatic precipitator 1 is also provided with a bearing housing that houses the bearing 21. The bearing housing is installed at the end of the brush 10. The first flange 14 and the second flange 15 are installed outside the bearing housing. As described above, in the past, if the brush was longer than the distance between the two bearings 21, it was necessary to disassemble or remove the bearing housing. In contrast, in this embodiment, the first flange 14 and the second flange 15 are installed outside the bearing housing, and the shaft portion 11 and the support portion 13 of the brush 10 are separated in the space between the bearing housings on both sides, making it unnecessary to disassemble or remove the bearing housing. This reduces the number of work steps and simplifies installation and removal of the brush 10.

[0048] Next, with reference to FIG. 5, a method for transporting the brush 10 when installing the brush 10 in the moving electrode type electrostatic precipitator 1 will be described.

[0049] The wire 22 for transporting the shaft 11 of the brush 10 is held closer to the middle of the shaft 11 than the first flange 14 so that movement of the wire 22 is prevented by the first flange 14. Specifically, for example, the end of the wire 22 may be formed into a ring shape, and the diameter of the ring may be smaller than the diameter of the outer circumferential surface of the first flange 14. Then, the wire 22 held by the shaft 11 transports the shaft 11 provided with the first flange 14.

[0050] Conventionally, brushes have only bristles and a support portion with a smaller diameter than the shaft portion, and unlike this embodiment, there is no member, such as the first flange 14, on which the wire 22 is hooked. Therefore, when transporting a brush to be replaced, a jig is used to secure the wire 22 to the brush, or the wire 22 is welded to the support portion to prevent the wire 22 from slipping out of the brush. In contrast, in this embodiment, the wire 22 is simply held closer to the middle of the shaft portion 11 than the first flange 14 so that the first flange 14 prevents the wire 22 from moving, and the wire 22 can be hooked to the shaft portion 11 to prevent it from slipping out of the shaft portion 11. This makes it easier to transport the brush 10, and reduces the time and cost required for replacement.

[0051] The shaft 11, which can now be transported by the wire 22, has one end lifted up. This allows the shaft 11 to be transported out of the casing 20 of the moving electrode electrostatic precipitator 1, or a new shaft 11 to be transported into the casing 20 of the moving electrode electrostatic precipitator 1. At this time, the shaft 11 is transported parallel to the dust collecting plate 4, which is installed parallel to the vertical direction. Also, as shown in FIG. 5, during transportation, the shaft 11 may be moved into the internal space of the throttle duct 23 downstream of the moving electrode electrostatic precipitator and tilted within the internal space of the throttle duct 23. This makes it easier to transport the shaft 11, unlike when work is performed without using the internal space of the throttle duct 23, and reduces the time and cost required for replacement work.

[0052] In the brush 10, the shaft 11 wears due to friction with the bearing 21, and the bristles 12 of the support 13 wear down due to friction with the dust collecting plate 4 and dust. For this reason, the brush 10 may be replaced during maintenance of the moving electrode type electrostatic precipitator 1.

[0053] The appropriate replacement times for the shaft portion 11 and the support portion 13 vary depending on the type of gas and dust flowing inside the moving electrode electrostatic precipitator 1. Conventionally, the shaft portion and the support portion of a brush are integrated, so the entire brush had to be replaced even if replacement of either one was not necessary. In contrast, in this embodiment, the shaft portion 11 and the support portion 13 can be disconnected, so that only the shaft portion 11 or the support portion 13 that needs to be replaced can be replaced. This allows the parts that do not need to be replaced to be used for a longer period of time, reducing the number of times the entire brush 10 needs to be replaced. Furthermore, the number of times the brush needs to be hung is reduced, and the shaft portion 11 is securely held by the wire 22, reducing the risk of work involved in replacing the brush 10.

[0054] As described above, according to this embodiment, the time required for replacement work can be shortened compared to the conventional art, improving safety, shortening the plant shutdown period, and increasing the plant availability rate.

[0055] The brush of the moving electrode type electrostatic precipitator, the moving electrode type electrostatic precipitator, and the method of installing the brush of the moving electrode type electrostatic precipitator according to the present embodiment described above can be understood, for example, as follows.

[0056] The brush (10) of the moving electrode type electrostatic precipitator (1) according to the present disclosure is a brush of the moving electrode type electrostatic precipitator that is installed along the dust collecting plate (4) of the moving electrode type electrostatic precipitator, and comprises a shaft portion (11) that is arranged parallel to the dust collecting plate, a removal portion (12) that is attached to the outer circumferential surface of the shaft portion and is capable of removing dust that has adhered to the dust collecting plate, and a support portion (13) that is arranged at the end of the shaft portion and is supported by a bearing (21), and the end of the shaft portion and the end of the support portion are configured to be connectable and disconnectable to each other.

[0057] According to this configuration, the shaft portion is disposed parallel to the dust collecting plate, and a removal portion capable of removing dust adhering to the dust collecting plate is attached to the outer peripheral surface of the shaft portion, and the removal portion can remove dust by contacting the dust collecting plate. Furthermore, the support portion is disposed at the end of the shaft portion and supported by the bearing, so that the brush is supported by the bearing with the shaft portion, removal portion, and support portion integrated together. The end of the shaft portion and the end of the support portion are configured to be connectable and disconnectable to each other. This allows the shaft portion and the support portion to be easily separated, unlike in cases where it is difficult to connect or disconnect the shaft portion and the support portion, making it easy to replace the brush supported by the bearing at both ends.

[0058] In the brush of the moving electrode type electrostatic dust collector of the present disclosure, the shaft portion is provided with a first flange (14) that protrudes radially outward at the end of the shaft portion, and the support portion may be provided with a second flange (15) that is connectable to the first flange and protrudes radially outward at the end of the support portion, and the first flange and the second flange are connectable and disconnectable to each other.

[0059] According to this configuration, a first flange is provided at the end of the shaft portion, and the first flange protrudes radially outward, and a second flange is provided at the end of the support portion, and the second flange protrudes radially outward. The first flange and the second flange can be connected and disconnected from each other, for example, by a bolt 18 and a nut 19. The shaft portion and the support portion are connected by fastening the bolt and nut with the first flange and the second flange sandwiched therebetween, and the connection between the shaft portion and the support portion is released by releasing the fastening of the bolt and nut.

[0060] In the brush of the moving electrode type electrostatic dust collector according to the present disclosure, the outermost peripheral end of the removal portion may be located radially inward of the outer peripheral surface of the first flange.

[0061] With this configuration, the outermost peripheral end of the remover is located radially inward from the outer peripheral surface of the first flange, so when the first flange is placed on the installation surface, the remover does not come into contact with the installation surface. This prevents damage to the remover when the brush is placed, and eliminates the need for a temporary stand or other device to prevent damage to the remover.

[0062] In the brush of the moving electrode type electrostatic precipitator according to the present disclosure, it is desirable that the second flange be installed closer to the shaft portion than the position where the support portion is supported by the bearing.

[0063] With this configuration, the shaft portion is located inside between the two bearings, so when replacing the brush, there is no need to remove the bearing from the moving electrode type electrostatic dust collector, and the brush can be easily attached and removed along the dust collecting plate.

[0064] In the brush of the moving electrode type electrostatic precipitator according to the present disclosure, the first flange and the second flange may each have either a recess (15a) or a protrusion (14a) formed on the opposing surfaces thereof so as to fit together.

[0065] According to this configuration, either a recess or a protrusion is formed on each of the opposing surfaces of the first flange and the second flange, and the first flange and the second flange are fitted together, which prevents misalignment between the shaft portion and the support portion and makes it easier for the central axes of the shaft portion and the support portion to align.

[0066] In the brush of the moving electrode type electrostatic precipitator according to the present disclosure, the protrusion may have a spigot structure in which the protrusion is housed inside the recess.

[0067] According to this configuration, the mating portion between the recess and the protrusion is a spigot structure in which the protrusion is housed inside the recess, so that the outer surface of the protrusion is in close contact with the inner surface of the recess, preventing misalignment between the shaft portion and the support portion and ensuring alignment of the central axes.

[0068] The moving-electrode electrostatic precipitator according to the present disclosure comprises a dust collecting plate of the moving-electrode electrostatic precipitator, a brush of the above-described moving-electrode electrostatic precipitator installed along the dust collecting plate, and a bearing supporting the brush.

[0069] The moving-electrode electrostatic precipitator according to the present disclosure may further include a bearing housing that houses the bearing therein, and the first flange and the second flange may be disposed outside the bearing housing.

[0070] According to this configuration, the shaft portion and the support portion of the brush are separated by the first flange and the second flange installed on the outside of the bearing housing, so there is no need to disassemble or remove the bearing housing.

[0071] The brush installation method for a moving electrode type electrostatic precipitator according to the present disclosure is a method for installing a brush to be installed along the dust collecting plate of the moving electrode type electrostatic precipitator, the brush comprising a shaft portion arranged parallel to the dust collecting plate, a removal portion attached to the outer peripheral surface of the shaft portion and capable of removing dust adhering to the dust collecting plate, and a support portion provided at the end of the shaft portion and supported by a bearing, the shaft portion having a first flange protruding radially outward from the end of the shaft portion, and the support portion having a second flange connectable to the first flange and protruding radially outward from the end of the support portion, the brush installation method for a moving electrode type electrostatic precipitator comprising the steps of installing the transported shaft portion along the dust collecting plate, supporting the support portion on a bearing, and connecting the shaft portion and the support portion via the first flange and the second flange.

[0072] According to this configuration, the first flange and the second flange can be connected and disconnected from each other, for example, by bolts and nuts. The shaft portion and the support portion are connected by fastening the bolts and nuts with the first flange and the second flange sandwiched between them, and the connection between the shaft portion and the support portion is disconnected by releasing the fastening of the bolts and nuts. Therefore, unlike when it is difficult to connect or disconnect the shaft portion and the support portion, the shaft portion and the support portion can be easily separated, making it easy to replace the brushes supported by bearings at both ends.

[0073] The brush installation method for a moving electrode type electrostatic dust collector according to the present disclosure may further include the steps of holding the wire (22) closer to the middle of the shaft portion than the first flange so that movement of the wire is prevented by the first flange, and transporting the shaft portion on which the first flange is provided by the wire held on the shaft portion.

[0074] With this configuration, the first flange prevents the wire from moving, so the wire can be hooked onto the shaft to prevent it from slipping out of the shaft, and the shaft provided with the first flange can be easily transported by the wire held in the shaft.

[0075] The brush installation method for a moving electrode type electrostatic precipitator according to the present disclosure may further include a step of lifting one end of the transported shaft portion and tilting the shaft portion inside a throttle duct (23) on the downstream side of the moving electrode type electrostatic precipitator.

[0076] With this configuration, one end of the shaft is lifted up during transportation, and the shaft is moved into the throttle duct downstream of the moving electrode electrostatic precipitator. Therefore, unlike when work is performed without using the internal space of the throttle duct, transportation of the shaft is easier, and the time and cost required for replacement work can be reduced. [Explanation of symbols]

[0077] 1: Moving electrode type electrostatic precipitator 2:Discharge electrode 3: Dust collecting electrode 4: Dust collection plate 5: Drive mechanism 7: Endless chain 8: Sprocket wheel 8A: Rotating shaft 10: Brush 11: Shaft 12: Hair (removal area) 13: Support part 13a: End 14: First flange 14a: Convex part 14b: Inner surface 15: Second flange 15a: Recess 15b: Inner surface 16: Round steel 16a: End 17:Circular tube 18: Bolt 19: Nut 20: Casing 21: Bearing 22: Wire 23: Restricted duct 24: Hopper

Claims

1. A brush of a moving electrode type electrostatic precipitator is installed along a dust collecting plate of the moving electrode type electrostatic precipitator, a shaft portion provided parallel to the dust collecting plate; a removal part attached to an outer peripheral surface of the shaft part and capable of removing dust adhering to the dust collecting plate; a support portion provided at an end of the shaft portion and supported by a bearing; Equipped with The end of the shaft portion and the end of the support portion are configured to be connectable and disconnectable to each other, The shaft portion is provided with a first flange protruding radially outward at an end of the shaft portion, A brush of a moving electrode type electrostatic precipitator, wherein the outermost end of the removal portion is located radially inward of the outer peripheral surface of the first flange or at the same position as the outer peripheral surface of the first flange.

2. The support portion is provided with a second flange that can be connected to the first flange and that protrudes radially outward at an end of the support portion; 2. The brush of a moving electrode type electrostatic precipitator according to claim 1, wherein the first flange and the second flange are connectable and disconnectable to each other.

3. 3. The brush of a moving electrode type electrostatic precipitator according to claim 2, wherein the second flange is disposed closer to the shaft portion than the position where the support portion is supported by the bearing.

4. 3. A brush for a moving electrode type electrostatic precipitator according to claim 2, wherein the first flange and the second flange are each formed with either a recess or a protrusion on their opposing surfaces so as to fit together.

5. 5. A brush for a moving electrode type electrostatic precipitator according to claim 4, wherein said protrusion has a spigot structure in which said protrusion is housed inside said recess.

6. a dust collecting plate of a moving electrode type electrostatic precipitator; a brush of the moving electrode type electrostatic precipitator according to claim 1, which is installed along the dust collecting plate; a bearing that supports the brush; A moving electrode type electrostatic precipitator comprising:

7. The support portion is provided with a second flange that can be connected to the first flange and that protrudes radially outward at an end of the support portion; the first flange and the second flange are connectable and disconnectable to each other, 7. The moving electrode type electrostatic precipitator according to claim 6, further comprising a bearing housing that accommodates the bearing therein, the first flange and the second flange being disposed outside the bearing housing.

8. A brush installation method for a moving electrode type electrostatic precipitator, which installs brushes to be installed along a dust collecting plate of the moving electrode type electrostatic precipitator, on the moving electrode type electrostatic precipitator, comprising: The brush is a shaft portion provided parallel to the dust collecting plate; a removal part attached to an outer peripheral surface of the shaft part and capable of removing dust adhering to the dust collecting plate; a support portion provided at an end of the shaft portion and supported by a bearing; Equipped with The shaft portion is provided with a first flange protruding radially outward at an end of the shaft portion, The support portion is provided with a second flange that is connectable to the first flange and that protrudes radially outward from an end of the support portion, The brush installation method for the moving electrode type electrostatic precipitator is as follows: placing the transported shaft portion along the dust collecting plate; a step of supporting the support portion on a bearing; connecting the shaft portion and the support portion via the first flange and the second flange; A brush installation method for a moving electrode type electrostatic precipitator.

9. holding the wire closer to an intermediate portion of the shaft portion than the first flange so that movement of the wire is prevented by the first flange; transporting the shaft portion provided with the first flange by the wire held by the shaft portion; The brush installation method for a moving electrode type electrostatic precipitator according to claim 8, further comprising:

10. 10. The brush installation method for a moving electrode type electrostatic dust collector according to claim 8 or 9, further comprising the step of lifting one end of the transported shaft portion and tilting the shaft portion inside a throttle duct downstream of the moving electrode type electrostatic dust collector.

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