Moving electrode type electric dust collector and method for replacing dust collecting plate moving chain of moving electrode type electric dust collector

Abstract

To provide a moving electrode type electric dust collector capable of safely and easily replacing an endless chain connected to a dust collecting plate of a dust collecting electrode, and a method for replacing a dust collecting plate moving chain of the moving electrode type electric dust collector.SOLUTION: The moving electrode type electric dust collector includes a dust collecting electrode having a plurality of dust collecting plates and installed to face a discharge electrode, a dust collecting plate moving chain which is an endless chain connected to the dust collecting plates and moves the dust collecting plates, a driving part 14 for driving the dust collecting plate moving chain, a brake part 15 for stopping the operation of the driving part 14 by a braking force, and a control part 16 for controlling the operations of the driving part 14 and the brake part 15. While stopping the operation of the drive unit 14, the control unit 16 controls the braking force of the brake unit 15 so as to maintain the stop of the operation of the drive unit 14.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a moving electrode type electrostatic precipitator and a method for replacing a dust collecting plate moving chain of a moving electrode type electrostatic precipitator. [Background technology]

[0002] In a moving electrode type electric dust collector, 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.

[0003] The dust collecting plates are long horizontally and arranged in multiple vertical directions. 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. Sprockets with which the endless chains mesh are attached at the upper and lower ends of the moving electrode dust collector, and the endless chains go around the two sprockets. As the dust collecting plates move along the sprockets attached at the upper or lower end, their installation direction changes from vertical to horizontal and then back to vertical. As a result, the upper and lower ends of the dust collecting plates are reversed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-342995 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-342994 Summary of the Invention [Problem to be solved by the invention]

[0005] The endless chain is exposed to the gas flowing inside the electrostatic precipitator, which contains particulate matter such as soot, and is therefore subject to wear and tear due to corrosion. Therefore, the endless chain is often replaced in existing electrostatic precipitators.

[0006] Conventionally, there have been several methods for replacing endless chains, each of which has its own issues.

[0007] The first example method is disclosed in, for example, Patent Document 1. In this method, an endless chain is fixed at multiple locations inside an electrostatic dust collector using multiple chain blocks. The old endless chain is then cut, and the end of a new endless chain is connected to the end of the cut endless chain. The fixed chain block is then operated to gradually install the new endless chain while moving the endless chain and dust collecting plates. After moving one dust collecting plate, the dust collecting plate is removed from the old endless chain at the bottom of the endless chain and attached to the new endless chain. Repeating this process completes the endless chain replacement process.

[0008] In this first example of work method, the chain block prevents the endless chain from rotating. Furthermore, when moving the endless chain and dust collecting plate, it is necessary to operate the chain block while preventing excessive rotation. If the chain block is fixed in the wrong place or if it is forgotten to be fixed, the endless chain and dust collecting plate hanging on both sides from the sprocket will become unbalanced, and there is a risk that the endless chain and dust collecting plate will drift in one direction and fall. The work of removing and installing the dust collecting plate is carried out at the lowest part of the endless chain, so it is extremely dangerous if it were to fall.

[0009] In the second example of a work method, an opening is made in the roof of the electrostatic precipitator, and the dust collecting electrodes and the entire endless chain are lifted up using large heavy machinery. While gradually raising the dust collecting electrodes and the entire endless chain, workers on the roof remove the dust collecting plates from the endless chain. Once all the dust collecting plates have been removed, the old endless chain is lowered to the ground. Then, a new endless chain is lifted up using large heavy machinery, and on the roof above the location where the dust collecting electrodes and endless chain will be installed, workers attach the dust collecting plates to the endless chain. Once the dust collecting plates are attached, the dust collecting electrodes and the entire endless chain are lowered, and once all the dust collecting plates are attached, the dust collecting electrodes and the endless chain are fixed inside the electrostatic precipitator.

[0010] This second example of the work method requires the preparation of large heavy machinery capable of lifting the entire load of the dust collection electrodes and endless chain. Furthermore, the installation of the large heavy machinery requires ground curing to protect the buried pipes on-site and the timing of the heavy machinery installation to be coordinated. Furthermore, the top plate and heat insulation boards must be removed to create an opening in the roof of the electrostatic precipitator, and the internal walkway and piping must be removed to move the dust collection electrodes vertically. After the replacement work, these removed parts must also be restored. This creates the problem of time and effort required for preparation for the endless chain replacement work.

[0011] Furthermore, because an opening is formed in the roof of the electrostatic precipitator, there is a risk that rainwater may enter the inside of the electrostatic precipitator during rainy weather. If rainwater does enter, the dust adhering to the rotating parts of the electrostatic precipitator may become solidified by the rainwater, which may cause malfunctions. Because it is difficult to provide rain protection during work, work must be prohibited during rainy weather in order to prevent rainwater from entering, which results in an extension of the construction period.

[0012] Patent Document 2 discloses a technique in which a dust collecting electrode (movable electrode) is suspended by large heavy machinery, taken in through an upper opening of an electrostatic precipitator, and installed inside the electrostatic precipitator, although the work location for attaching the dust collecting plate is different from that of the second example of the work method described above.

[0013] The present disclosure has been made in consideration of the above circumstances, and aims to provide a moving electrode type electric dust collector that allows for safe and easy replacement of the endless chain connected to the dust collecting plate of the dust collecting electrode, and a method for replacing the dust collecting plate moving chain of a moving electrode type electric dust collector. [Means for solving the problem]

[0014] In order to solve the above problems, the moving electrode type electrostatic precipitator and the method for replacing the dust collecting plate moving chain of the moving electrode type electrostatic precipitator of the present disclosure employ the following means. That is, the moving electrode type electric dust collector according to the present disclosure comprises a dust collecting electrode having a plurality of dust collecting plates and installed opposite a discharge electrode, a dust collecting plate moving chain which is an endless chain connected to the dust collecting plates and moves the dust collecting plates, a drive unit which drives the dust collecting plate moving chain, a brake unit which stops the operation of the drive unit by braking force, and a control unit which controls the operation of the drive unit and the brake unit, and the control unit controls the braking force of the brake unit so as to maintain the stoppage of the operation of the drive unit while the operation of the drive unit is stopped.

[0015] The method for replacing a dust collecting plate moving chain of a moving electrode type electric dust collector according to the present disclosure is a method for replacing a dust collecting plate moving chain of a moving electrode type electric dust collector comprising: a dust collecting electrode having a plurality of dust collecting plates and installed opposite a discharge electrode; a dust collecting plate moving chain which is an endless chain connected to the dust collecting plates and moves the dust collecting plates; a drive unit which drives the dust collecting plate moving chain; a brake unit which stops the operation of the drive unit by braking force; and a control unit which controls the operation of the drive unit and the brake unit, and comprises the steps of moving the dust collecting plate moving chain, stopping the movement of the dust collecting plate moving chain, and using the braking force of the brake unit to maintain the stop of operation of the drive unit while the operation of the drive unit is stopped. [Effects of the Invention]

[0016] According to the present disclosure, the endless chain connected to the dust collecting plate of the dust collecting electrode can be replaced safely and easily. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view illustrating a moving electrode electrostatic precipitator according to an embodiment of the present disclosure. [Figure 2] 1 is a perspective view showing a casing that houses a moving-electrode electrostatic precipitator and a fixed-electrode electrostatic precipitator according to an embodiment of the present disclosure, with the interior partially shown. FIG. [Figure 3] 1 is a plan view showing a moving electrode electrostatic precipitator according to an embodiment of the present disclosure, with the dust collecting plate omitted; FIG. [Figure 4] 4 is a front view showing a moving electrode type electrostatic precipitator according to one embodiment of the present disclosure, taken along the line IV-IV in FIG. 3. FIG. [Figure 5] 4 is a front view showing a part of a drive mechanism of a moving-electrode electrostatic precipitator according to an embodiment of the present disclosure, taken along the line VV in FIG. 3. FIG. [Figure 6] FIG. 2 is a block diagram showing a motor, an inverter panel, a local operation panel, and a central operation panel of a moving electrode type electrostatic precipitator according to one embodiment of the present disclosure. [Figure 7] 1 is a flowchart illustrating a method for replacing a dust collection plate moving chain of a moving electrode type electrostatic precipitator according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0018] A moving electrode type electrostatic precipitator 1 according to an embodiment of the present disclosure will be described below with reference to the drawings. A moving-electrode electrostatic precipitator 1 is installed in an exhaust gas treatment facility provided in a flue downstream of an industrial combustion facility such as a thermal power plant or an incinerator. As shown in Fig. 1, the moving-electrode electrostatic precipitator 1 (hereinafter referred to as "electrostatic precipitator 1") has a dust collection electrode 3 having a plurality of movable dust collection plates 6, and dust (particulate matter) is deposited on the surfaces of the dust collection plates 6. As shown in Fig. 2, the electrostatic precipitator 1 may be housed in the same casing 20 as a fixed-electrode electrostatic precipitator 21, whose dust collection electrode is fixed in position, and the electrostatic precipitator 1 may be arranged in series along the gas flow direction, or the electrostatic precipitator 1 may be used independently.

[0019] As shown in Figures 1 to 5, the electrostatic precipitator 1 includes a discharge electrode 2, a collecting electrode 3, and a drive mechanism 4, which are arranged inside a casing 20. When one collecting electrode 3 includes multiple collecting plates 6 supported by the same collecting plate moving chain 7, the multiple collecting electrodes 3 are arranged inside the casing 20 in a horizontal direction and a direction perpendicular to the gas flow, as shown in Figures 3 and 4.

[0020] As shown in FIG. 2, the casing 20 is provided with a gas inlet 20A and a gas outlet 20B on two opposing side surfaces, respectively, and a gas flow path is formed inside through which gas flows horizontally.

[0021] 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 6 of the dust collecting electrode 3. As shown in FIG. 4, some discharge electrodes 2 are arranged inside the loop formed by the dust collecting electrodes 3, and some are arranged between adjacent dust collecting electrodes 3.

[0022] The dust collecting plate 6 of the dust collecting electrode 3 is a metal plate-shaped member, and is placed opposite the discharge electrode 2. The plate surfaces (front and back surfaces) of the dust collecting plate 6 are placed approximately parallel to the direction of gas flow at the gas inlet 20A of the casing 20. The width of the dust collecting plate 6 is, for example, 3 m to 5 m.

[0023] The discharge wires of the discharge electrode 2 are placed opposite the collecting electrode 3 so that the area affected by the corona discharge is appropriately distributed on the collecting plate 6 of the collecting electrode 3. For example, the discharge wires are evenly arranged in the width direction of the long side of the opposing collecting electrode 3. Furthermore, because the discharge electrodes 2 are arranged side by side in the gas flow 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.

[0024] 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.

[0025] The collecting electrode 3 has a plurality of dust collecting plates 6, which are arranged in the vertical direction. The dust collecting plates 6 have a rectangular shape, with the long sides aligned along the gas flow direction and the short sides aligned along the height direction.

[0026] As shown in FIGS. 3 to 5, the drive mechanism 4 includes a dust collecting plate moving chain 7, a dust collecting plate moving sprocket (sprocket) 8, a motor 9, a rotating shaft 10, a drive sprocket 11, a drive chain 12, and the like.

[0027] As shown in FIG. 1 , the dust collecting plate moving chains 7 are provided on both horizontal ends (left and right ends) of the dust collecting plate 6, and the dust collecting plate 6 is supported by the dust collecting plate moving chains 7. Multiple dust collecting plates 6 are arranged along two pairs of annular dust collecting plate moving chains 7. Dust collecting plate moving sprockets 8 engaged with the dust collecting plate moving chains 7 are arranged at the upper and lower ends of the dust collecting electrode 3, and the dust collecting plate moving chains 7 go around the two dust collecting plate moving sprockets 8. The dust collecting plate moving chains 7 may be formed of a roller chain or another type of chain, for example a link chain.

[0028] The upper dust collecting plate movement sprocket 8 engages with the dust collecting plate movement chain 7 and transmits the rotational force of the motor 9 to the dust collecting plate movement chain 7. The lower dust collecting plate movement sprocket 8 rotates around a rotation axis 10 as the engaged dust collecting plate movement chain 7 moves. The multiple dust collecting plates 6 are arranged in two vertical rows between the upper and lower dust collecting plate movement sprockets 8.

[0029] As the dust collecting plate 6 moves along the outer periphery of the dust collecting plate moving sprocket 8 arranged at the upper or lower end, the installation direction of the dust collecting plate 6 changes from vertical to horizontal and then changes back to vertical. As a result, the upper end side and the lower end side of the dust collecting plate 6 are reversed.

[0030] The motor 9 generates a rotational force using electricity. As shown in FIG. 6 , the motor 9 has a drive unit 14 and a brake unit 15. The drive unit 14 has a speed reduction mechanism, for example, a reducer with a brake. The rotational force generated by the drive unit 14 drives the dust collecting plate moving chain 7. The brake unit 15 stops the operation of the drive unit 14 by braking force. Furthermore, even when torque is applied from the outside, the brake unit 15 generates a braking force that resists the external torque. This allows the brake unit 15 to maintain the movement of the dust collecting plate moving chain 7 in a stopped state. The brake unit 15 is, for example, an electromagnetic brake. Note that the brake unit in the present disclosure is not limited to this example and may have another configuration as long as it can maintain the stoppage of the operation of the drive unit 14.

[0031] As shown in Fig. 6, a local operation panel 22 is installed in the electrostatic precipitator 1. An inverter panel 13 and a central operation panel 23 are installed at a position away from the electrostatic precipitator 1. The local operation panel 22 is installed, for example, near a manhole provided in the casing 20 of the electrostatic precipitator 1. The inverter panel 13 is installed in an electrical room for the electrostatic precipitator 1 and the like. The central operation panel 23 is installed in the central operation room and may be installed in or incorporated into, for example, a monitoring panel or the like.

[0032] As shown in FIG. 6, the inverter board 13 is provided with a control unit 16, a switching unit 17, and the like. The control unit 16 controls the operation of each of the drive unit 14 and the brake unit 15 of the motor 9. The control unit 16 controls the drive of the drive unit 14, causing the drive unit 14 to start and stop operation. The control unit 16 also controls the ON / OFF of the brake unit 15, causing the brake unit 15 to generate and release a braking force. While the operation of the drive unit 14 is stopped, the control unit 16 controls the braking force of the brake unit 15 so as to maintain the stoppage of the operation of the drive unit 14. The switching unit 17 is provided for each motor 9 and is connected to a changeover switch 24 of a local operation panel 22 .

[0033] The local operation panel 22 is provided with a changeover switch 24 and an operation button 25 for driving or stopping the motor 9 . The changeover switch 24 can be switched between local operation and central operation, for example, by inserting and turning a key, and is normally set to the central operation side. When the changeover switch 24 is set to the local operation side, the operation button 25 is enabled and operation from the operation button 26 of the central operation panel 23 is disabled. While the changeover switch 24 is set to the central operation side, operation from the operation button 25 is disabled and only operation from the operation button 26 of the central operation panel 23 is possible.

[0034] The operation button 25 of the local operation panel 22 is operated by an operator when starting or stopping the operation of the motor 9. For example, the motor 9 operates only while the operation button 25 is pressed by the operator, and when the operation button 25 is released, the operation of the motor 9 is stopped with braking force being generated by the brake unit 15. When the operation of the motor 9 is started, the drive unit 14 is driven and the braking force by the brake unit 15 is released. When the operation of the motor 9 is stopped, the drive unit 14 is stopped and braking force is generated by the brake unit 15.

[0035] As shown in Figure 3, the drive sprocket 11 is connected to the dust collecting plate moving sprocket 8 via a rotation shaft 18, and transmits the rotational force of the drive sprocket 11 to the dust collecting plate moving sprocket 8. The multiple drive sprockets 11 are connected to each other via a drive chain 12.

[0036] The rotational force of the motor 9 is transmitted to the drive chain 12. The drive chain 12 is engaged with a plurality of drive sprockets 11. The drive chain 12 receives the driving force from the drive unit 14 of the motor 9 and rotates the plurality of dust collecting plate moving sprockets 8 via the drive sprockets 11. When the motor 9 starts operating, all of the drive sprockets 11 engaged with the drive chain 12 rotate, and when the motor 9 stops operating, all of the drive sprockets 11 engaged with the drive chain 12 stop rotating.

[0037] The number of drive chains 12 varies depending on the number and arrangement of the dust collecting plate movement sprockets 8. In the example shown in FIGS. 3 and 5, four drive chains 12 are used to drive six dust collecting plate movement sprockets 8 with one motor 9. The drive chain 12 includes a drive chain 12A connected to the motor 9 to transmit driving force, and a drive chain 12B that transmits driving force from the drive chain 12A via the drive sprockets 11. In the example shown in FIGS. 3 and 5, there is one drive chain 12A that is engaged with three drive sprockets 11. In the example shown in FIGS. 3 and 5, there are three drive chains 12B that are engaged with two adjacent drive sprockets 11. As the drive chains 12A and 12B move, all of the drive sprockets 11 rotate simultaneously, and all of the dust collecting plate movement sprockets 8 rotate via the rotation shaft 18.

[0038] The dust collecting plate moving sprocket 8 can be disconnected from the drive chain 12 so that force from the drive chain 12 is not transmitted. Specifically, as shown in Fig. 3, a flange 19 is provided on the rotating shaft 18, and the flange 19 and the drive sprocket 11 can be connected with a bolt (not shown).

[0039] When the flange 19 and the drive sprocket 11 are connected by the bolts, the dust collecting plate moving sprocket 8 is connected to the drive chain 12. At this time, the force from the drive chain 12 is transmitted to the dust collecting plate moving sprocket 8 via the drive sprocket 11, and the dust collecting plate moving sprocket 8 rotates when the motor 9 starts operating.

[0040] On the other hand, when the bolts are removed and the connection between the flange 19 and the drive sprocket 11 is released, the dust collecting plate moving sprocket 8 is released from the connection with the drive chain 12. At this time, the drive sprocket 11 rotates freely relative to the rotating shaft 18, and the dust collecting plate moving sprocket 8 does not receive force from the drive chain 12, so it remains stopped and does not rotate even when the motor 9 starts operating.

[0041] In each of the multiple collecting electrodes 3, the flange 19 and the drive sprocket 11 have a configuration that allows them to be connected and disconnected, so that only the collecting plate moving sprocket 8 of the collecting electrode 3 for which the collecting plate moving chain 7 is being replaced can be rotated, while the other collecting electrodes 3 can remain stationary.

[0042] Next, a method for replacing the dust collecting plate moving chain 7 of the electric dust collector 1 will be described with reference to FIG. The dust collecting plate moving chain 7 installed in an existing electric dust collector 1 may need to be replaced due to wear, and normal operation of the electric dust collector 1 is stopped to replace the dust collecting plate moving chain 7.

[0043] The above-described electrostatic precipitator 1 is described as being equipped with a motor 9 having a brake unit 15. If the electrostatic precipitator 1 is equipped with a motor 9 having a brake unit 15, the work of replacing the dust collecting plate moving chain 7, which will be described below, can begin. Furthermore, if the motor that drives the dust collecting plate moving chain 7 in an existing electrostatic precipitator 1 does not have a brake unit 15, the motor is replaced first before the work of replacing the dust collecting plate moving chain 7. In this case, the motor 9 having the brake unit 15 and the on-site operation panel 22 are installed in the electrostatic precipitator 1. Since there is no need to replace components other than the motor, the work of replacing the dust collecting plate moving chain 7 can be easily started.

[0044] Inside the electrostatic precipitator 1, the old dust collecting plate moving chain 7 is cut near the lower dust collecting plate moving sprocket 8 (step S1), and the end of a new dust collecting plate moving chain 7 is connected to the end of the cut dust collecting plate moving chain 7 (step S2). Then, while moving the dust collecting plate moving chain 7, the connected part is gradually moved upward (step S3). When the connected part reaches the upper dust collecting plate moving sprocket 8, the new dust collecting plate moving chain 7 is approximately half installed. Continuing, while moving the dust collecting plate moving chain 7, the connected part is gradually moved downward. When the connected part reaches the vicinity of the lower dust collecting plate moving sprocket 8, the connection between the end of the old dust collecting plate moving chain 7 and the end of the new dust collecting plate moving chain 7 is released (step S4). Then, one end of the new dust collecting plate moving chain 7 is joined to the other end, thereby completing the replacement of the dust collecting plate moving chain 7 (step S5).

[0045] To replace the dust collecting plate moving chain 7, it is necessary to remove the dust collecting plates 6 from the old dust collecting plate moving chain 7 and then attach the dust collecting plates 6 to the new dust collecting plate moving chain 7. The motor 9 is stopped during the dust collecting plate 6 removal and attachment operations. The dust collecting plates 6 are removed and attached one by one by an operator near the dust collecting plate moving sprocket 8 at the lower end. After one dust collecting plate 6 is removed from the old dust collecting plate moving chain 7 and attached to the new dust collecting plate moving chain 7, the motor 9 is started to move the dust collecting plate moving chain 7. Then, another dust collecting plate 6 is removed and attached. This operation is repeated to move the dust collecting plate moving chain 7 as described above. When the dust collecting plate moving chain 7 replacement operation is completed, all of the dust collecting plates 6 are attached to the new dust collecting plate moving chain 7.

[0046] During the above-mentioned work, the power supply to the electrostatic precipitator 1 is turned off on the panel side, and the electrostatic precipitator 1 is mechanically grounded on the charging device side. The steel frame and discharge electrode 2 of the electrostatic precipitator 1 are also grounded with a grounding rod, and oxygen deficiency measurements are taken inside the electrostatic precipitator 1 to confirm that there are no problems before workers begin work inside. Furthermore, manholes that can be opened are left open as much as possible to prevent temperature increases and ensure ventilation.

[0047] According to the above-described configuration, the method for replacing the dust collecting plate moving chain 7 of the electric dust collector 1 according to this embodiment has the following advantages.

[0048] The electrostatic precipitator 1 is equipped with a motor 9 having a brake unit 15, and the dust collecting plate moving chain 7 is replaced with a new one while being moved by the motor 9. The brake unit 15 not only stops the operation of the drive unit 14 by braking force, but also generates a braking force that resists external torque when external torque is applied.

[0049] During the removal and installation of the dust collecting plate 6, the dust collecting plate moving chain 7 and the dust collecting plate 6 are suspended on both sides from the dust collecting plate moving sprocket 8. Even if the total load of the dust collecting plate 6 on one side and the total load of the dust collecting plate 6 on the other side become unbalanced and one load becomes larger, the brake unit 15 suppresses the rotation of the dust collecting plate moving sprocket 8 and the movement of the dust collecting plate moving chain 7.

[0050] Safety is ensured by the mechanical operation of the brake unit 15, preventing dangers caused by human error, such as incorrectly selecting the fixing location of the chain block, forgetting to fix it, or malfunctioning of the drive unit 14 of the motor 9. In addition, the movement of the dust collecting plate moving chain 7 and the rotation of the dust collecting plate moving sprocket 8 are fixed more stably and reliably than when they are fixed only by the chain block. Therefore, there is no risk of the dust collecting plate moving chain 7 and the dust collecting plate 6 falling, and work can be done safely at the bottom of the dust collecting plate moving chain 7.

[0051] After the removal and installation of the dust collecting plate 6, safety is ensured by the operation of the brake unit 15 when the dust collecting plate moving chain 7 and the dust collecting plate 6 are moved by the motor 9. In a conventional method using a motor without the brake unit 15, when moving the dust collecting plate moving chain 7 and the dust collecting plate 6, a worker had to balance the dust collecting plate moving chain 7 and the dust collecting plate 6, which have a large total load. In this embodiment, unlike when there is no brake unit 15, the number of workers required in the process of moving the dust collecting plate moving chain 7 and the dust collecting plate 6 can be reduced.

[0052] Furthermore, because the dust collecting plate moving chain 7 can be replaced inside the electrostatic precipitator 1, unlike a method in which an opening is created in the roof of the electrostatic precipitator 1 and the entire dust collecting electrode 3 and dust collecting plate moving chain 7 are lifted using large heavy machinery, the number of work steps is reduced, saving time and effort. For example, there is no need to create an opening in the roof or to temporarily remove and restore the roof after replacement, which requires sealing the opening. Furthermore, with conventional methods, creating an opening in the roof of the electrostatic precipitator 1 can result in the risk of rainwater entering the roof. In contrast, because the work can be performed without creating an opening, dust adhering to the rotating parts of the electrostatic precipitator 1 is prevented from becoming solidified by rainwater. Furthermore, because large heavy machinery is not used, there is no need to prepare the ground for the heavy machinery or to coordinate the installation timing of the heavy machinery.

[0053] If the on-site operation panel 22 is not installed in the electrostatic precipitator 1, it is necessary to operate the movement of the dust collecting plate moving chain 7 and the dust collecting plates 6 from a control room or the like where it is possible to start and stop the operation of the motor 9. In contrast, if the on-site operation panel 22 is installed in the electrostatic precipitator 1, it is possible to start and stop the operation of the motor 9 while checking the working status inside the electrostatic precipitator 1, thereby improving safety and work efficiency.

[0054] The dust collecting plate moving sprocket 8 can be disconnected from the drive chain 12 so that force from the drive chain 12 is not transmitted. This allows only the dust collecting plate moving sprocket 8 of the collecting electrode 3 for which the dust collecting plate moving chain 7 is to be replaced to rotate, among multiple collecting electrodes 3 operated by a single motor 9. Therefore, the replacement work can be performed without rotating the other collecting electrodes 3. Depending on the number of workers, multiple collecting electrodes 3 may be kept rotatable and the dust collecting plate moving chain 7 may be replaced simultaneously in parallel.

[0055] The method for replacing the moving-electrode electrostatic precipitator and the dust collecting plate moving chain of the moving-electrode electrostatic precipitator according to the present embodiment described above can be understood, for example, as follows. The moving electrode type electric dust collector (1) according to the present disclosure comprises a dust collecting electrode (3) having a plurality of dust collecting plates (6) and installed opposite a discharge electrode (2), a dust collecting plate moving chain (7) which is an endless chain connected to the dust collecting plates and moves the dust collecting plates, a drive unit (14) which drives the dust collecting plate moving chain, a brake unit (15) which stops the operation of the drive unit by braking force, and a control unit (16) which controls the operation of the drive unit and the brake unit, and the control unit controls the braking force of the brake unit so as to maintain the stoppage of the operation of the drive unit while the operation of the drive unit is stopped.

[0056] According to this configuration, the dust collecting electrode has a plurality of dust collecting plates and is installed facing the discharge electrode, and an endless chain, a dust collecting plate moving chain, is connected to the dust collecting plates to move them. A drive unit drives the dust collecting plate moving chain, a brake unit stops the operation of the drive unit with a braking force, and a control unit controls the operation of the drive unit and the brake unit. The control unit controls the braking force of the brake unit so as to maintain the stoppage of the operation of the drive unit while the operation of the drive unit is stopped. This allows the dust collecting plate moving chain to be replaced with a new one while being moved by the drive unit. Because the braking force of the brake unit reliably stops the operation of the drive unit, movement of the dust collecting plate moving chain is suppressed during the operation of removing and attaching the dust collecting plates to the dust collecting plate moving chain. Therefore, the endless chain connected to the dust collecting plates of the dust collecting electrode can be safely and easily replaced.

[0057] In the above disclosure, the dust collecting electrode assembly may further include a plurality of sprockets (8) that engage with the dust collecting plate moving chains provided for each of the plurality of dust collecting electrodes, and a drive chain (12) to which driving force from the drive unit is transmitted to rotate the plurality of sprockets, and the sprockets may be capable of being disconnected from the drive chain so that force from the drive chain is not transmitted.

[0058] According to this configuration, the multiple sprockets are engaged with the dust collecting plate moving chains provided for the multiple collecting electrodes, respectively, and the drive chain rotates the multiple sprockets when a driving force from the drive unit is transmitted to the drive chain. As a result, when the drive unit generates a driving force, the multiple sprockets rotate via the drive chain, and the dust collecting plate moving chain moves. The sprockets can also be disconnected from the drive chain so that the force from the drive chain is not transmitted. This allows only the sprocket of the collecting electrode whose dust collecting plate moving chain is to be replaced to rotate, among the multiple collecting electrodes operated by the drive unit. Therefore, the replacement work can be performed without rotating the other collecting electrodes.

[0059] The method for replacing a dust collecting plate moving chain of a moving electrode type electric dust collector according to the present disclosure is a method for replacing a dust collecting plate moving chain of a moving electrode type electric dust collector comprising: a dust collecting electrode having a plurality of dust collecting plates and installed opposite a discharge electrode; a dust collecting plate moving chain which is an endless chain connected to the dust collecting plates and moves the dust collecting plates; a drive unit which drives the dust collecting plate moving chain; a brake unit which stops the operation of the drive unit by braking force; and a control unit which controls the operation of the drive unit and the brake unit, and comprises the steps of moving the dust collecting plate moving chain, stopping the movement of the dust collecting plate moving chain, and using the braking force of the brake unit to maintain the stop of the operation of the drive unit while the operation of the drive unit is stopped. [Explanation of symbols]

[0060] 1: Moving electrode type electrostatic precipitator (electrostatic precipitator) 2:Discharge electrode 3: Dust collecting electrode 4: Drive mechanism 6: Dust collecting plate 7: Dust collection plate moving chain 8: Dust collection plate moving sprocket (sprocket) 9: Motor 10: Rotation axis 11: Drive sprocket 12, 12A, 12B: Drive chain 13: Inverter panel 14: Drive unit 15: Brake section 16: Control section 17: Switching section 18: Rotation axis 19: Flange 20: Casing 20A: Gas inlet 20B: Gas outlet 21: Fixed electrode type electrostatic precipitator 22: Field operation panel 23: Central control panel

Claims

1. a dust collecting electrode having a plurality of dust collecting plates and disposed opposite the discharge electrode; a dust collecting plate moving chain that is an endless chain connected to the dust collecting plate and moves the dust collecting plate; a drive unit that drives the dust collecting plate moving chain; a brake unit that stops the operation of the drive unit by braking force; a control unit that controls the operation of the drive unit and the brake unit; Equipped with The control unit controls the braking force of the brake unit so as to maintain the stoppage of operation of the drive unit while the drive unit is stopped.

2. a plurality of sprockets provided for each of the plurality of dust collection electrodes, the sprockets engaging with the dust collection plate moving chains, respectively; a drive chain to which a driving force from the drive unit is transmitted and which rotates the plurality of sprockets; Further provided with 2. The moving electrode electrostatic precipitator according to claim 1, wherein the sprocket is capable of being disconnected from the drive chain so that force from the drive chain is not transmitted.

3. A method for replacing a dust collecting plate moving chain of a moving electrode type electrostatic precipitator, the method comprising: a dust collecting electrode having a plurality of dust collecting plates and installed opposite a discharge electrode; a dust collecting plate moving chain which is an endless chain connected to the dust collecting plates and moves the dust collecting plates; a drive unit which drives the dust collecting plate moving chain; a brake unit which stops the operation of the drive unit by braking force; and a control unit which controls the operation of the drive unit and the brake unit, moving the dust collecting plate moving chain; stopping the movement of the dust collecting plate moving chain; a step of causing the brake unit to maintain the stoppage of the operation of the drive unit by the braking force while the operation of the drive unit is stopped; A method for replacing a dust collecting plate moving chain of a moving electrode type electrostatic precipitator.

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