JP5412358B2 - Electrode dust collector electrode replacement method - Google Patents

Description

  The present invention relates to an installation method of a dust collecting electrode and a discharge electrode (hereinafter, abbreviated as an electrode) of an electrostatic precipitator, and in particular, when taking out and carrying in an electrode when the electric precipitator is updated, The present invention relates to a method for replacing an electrode of an electrostatic precipitator capable of performing work safely and efficiently.

  Inside the casing of the electrostatic precipitator, the dust collecting electrode and the discharge electrode are suspended facing each other at a predetermined interval. In the case of a large electrostatic precipitator, the electrode has a horizontal length of several meters, The vertical length is a dozen or so meters. When the electrode is deteriorated due to, for example, corrosion during long-time operation of the electrostatic precipitator, it is necessary to update to a new electrode.

  As a conventional method for installing an electrode for an electrostatic precipitator, for example, as described in Patent Document 1, a plurality of electrode plates housed in a box are craned from a ceiling opening of a casing of the electrostatic precipitator. There is a known method of carrying it in while hanging it.

  Moreover, as an update construction method, for example, as disclosed in Patent Document 2, there is a construction method in which an electrode plate is carried in from an upper opening on a side surface of a casing.

JP 2001-145841 A JP-A-7-96214

  In the method for installing / updating the electrode plate of the electrostatic precipitator according to the above-described prior art, the electrode plate is lifted up to the ceiling or the side surface of the casing of the electrostatic precipitator and carried into the casing. A large-scale electrostatic precipitator can be 20 meters or more in height, so it must be pulled up to a very high position with a crane, a large crane is required, and the cost is high. There was a problem that it took time and was inferior in safety under the influence of wind.

  In addition, there is a problem in that the work scaffold for opening the ceiling and side surfaces of the casing of the electrostatic precipitator or providing a guide rope for guiding the electrode plate becomes large.

  In addition, the casing of the electrostatic precipitator may be provided with a small brace at the center for reinforcement. In the construction method in which the electrode plate is carried in from the upper opening on the side surface of the casing shown in Patent Document 2, the brace is once removed, the electrode plate is carried in, and the brace is returned to its original state after carrying in. For this reason, there is a problem that the work becomes complicated and takes a lot of work time.

  The present invention has been made to solve the above-mentioned problems. The purpose of the present invention is to replace the electrode of the electrostatic precipitator at the time of renewal. It is an object of the present invention to provide a method for replacing an electrode of an electrostatic precipitator that can be carried out automatically and can shorten the construction period.

  The method for replacing the electrode of the electrostatic precipitator of the present invention relates to an electrostatic precipitator that collects dust with the dust collecting electrode and the discharge electrode facing each other, and the pair of dust collecting electrode and discharge electrode are connected by a wire or the like. An integrated electrode set is created by combining them, and an opening is formed in the lower part of the casing surface, which is a side surface when viewed from the exhaust gas inlet surface, and the electrode set is taken from there.

  When taking in from the opening, the electrode set is stood on the gantry, the upper end is taken into the dust collection chamber from the opening, a hoist hook is attached to the upper part of the electrode set, and the hoist is pulled into the dust collection chamber. Thereafter, the hoist is once removed from the electrode set, the electrode set is laid on a roller conveyor, and moved to a predetermined position by the roller conveyor. If the electrode is a type of electrode divided into an upper electrode and a lower electrode, take in both the upper electrode that is the upper part and the lower electrode that is the set together, connect them together, and then reattach the hoist to the upper end of the upper electrode Install and pull up. When the pulling is finished, in order to secure a working space in the casing, it is hung in an offset state on an electrode suspension beam provided on the casing by a J bolt or a U bolt. When a predetermined number of sheets are taken into the dust collection chamber, the width adjustment up to that point is canceled and the correct position is re-placed, and all the J bolts are replaced with U bolts. And after unwinding a number line and separating an electrode into a dust collection electrode and a discharge electrode, both the upper and lower stages of the dust collection electrode and the discharge electrode are connected with regular connection parts to form an electrode.

  The above is the work procedure for carrying in the electrode. When carrying out the electrode, the work procedure may be almost reversed.

  According to the present invention, when the electrode of the electrostatic precipitator is replaced at the time of renewal, the work can be performed safely without being affected by the wind, and the work can be performed efficiently, and the construction period can be shortened.

It is a perspective view of the electric dust collector which concerns on one Embodiment of this invention. It is a perspective view which shows a mode when seeing through a part of electric dust collector of FIG. 1, providing an opening part in a side surface, and taking in an electrode set. It is a perspective view which shows a mode when taking in an electrode set and moving on the roller conveyor. It is a perspective view which shows the electrode set which conjugated the discharge electrode and the dust collection electrode. It is sectional drawing which shows a mode when an upper electrode set and a lower electrode set are connected. It is a front view which shows a mode when letting the electrode set pass to the lower space of a brace. It is sectional drawing which shows a mode when the electrode set is brought near by J bolt. It is sectional drawing which shows a mode when an electrode set is attached to the regular position with the U volt | bolt. It is a schematic diagram which shows the installation method of an electrode (the 1). It is a schematic diagram which shows the installation method of an electrode (the 2). It is a schematic diagram which shows the installation method of an electrode (the 3).

  Hereinafter, an embodiment according to the present invention will be described with reference to FIGS. 1 to 8C.

First, the structure of the electrostatic precipitator according to one embodiment of the present invention will be described with reference to FIGS. 1 to 7B.
FIG. 1 is a perspective view of an electrostatic precipitator according to an embodiment of the present invention.
The dust collection electrode 15 and the discharge electrode 11 are disposed so as to face each other in parallel with the flow direction of the exhaust gas flowing in from the exhaust gas inlet 50.
FIG. 2 is a perspective view showing a state in which a part of the electrostatic precipitator in FIG.

  The electrode set 14 is shown in a state where it is leaned on an electrode set drawing base 20 provided obliquely in the opening 16 by a crane (not shown). A roller conveyor 36 used for horizontal movement of the electrode set 14 is disposed inside the casing.

FIG. 3 is a perspective view showing a state in which the electrode set is taken in and moved on the roller conveyor. The state which has passed through the lower space of the breath 65 is shown.
FIG. 4 is a perspective view showing a state of an electrode set in which the discharge electrode 11 and the dust collecting electrode 15 are joined together.

  The discharge electrode 11 and the dust collecting electrode 15 are tied together by the wire 17 to make a set. The electrode set 14 can be lifted by connecting the suspension member 41 to the beam 15 a on the upper side of the dust collecting electrode 15.

  FIG. 5 is a cross-sectional view showing a state where the upper electrode set 14 u and the lower electrode set 14 d are connected using the shackle 45 and the bolt 46.

  The shackle 45 and the bolt 46 are replaced with proper connecting parts when the lifting operation of the electrode set 14 is completed.

FIG. 6 is a front view showing a state when the electrode set 14 is passed through the lower space of the breath 65.
FIG. 7A is a cross-sectional view showing a state when the electrode set 14 is being brought closer by the J bolt 72.
FIG. 7B is a cross-sectional view showing a state where all the J bolts 72 are replaced with U bolts 74 and the electrode set 14 is attached to the normal position of the dust collection electrode 15.
The discharge electrode 11 is later detached from the dust collection electrode 15 by removing the wire 17, and attached to the normal position of the discharge electrode 11.

  As shown in FIG. 1, the electrostatic precipitator 10 that performs the electrode replacement method of the present embodiment is a fixed electrode type device in which a dust collecting electrode 15 and a discharge electrode 11 are combined. It is used to purify the exhaust gas when burning coal at a certain place.

  A high voltage is applied to the discharge electrode 11, an electric field is formed between the discharge electrode 11 and the exhaust gas around the discharge electrode 11 is ionized to supply ions, and from the exhaust gas inlet 50, The exhaust gas containing dust particles (dust mist) is taken in, the dust particles contained in the exhaust gas are charged with ions, and collected by the Coulomb force on the dust collection electrode 15.

  First, in order to install the electrode of the present embodiment, as shown in FIG. 4, the discharge electrode 11 is suspended from the beam 15 a by a line 17 outside the electric dust collector 10, An electrode set 14 in which the discharge electrode 11 is integrated is created. The discharge electrode 11 has a structure in which the discharge wire 11c is passed through the discharge electrode frame 11a and the horizontal frame 11b.

  And as shown in FIG. 2, the opening part 16 about 3 m high is opened in the lower part of the surface which is a side surface seeing from the waste gas inflow port 50 of the casing 12 of the electrostatic precipitator 10. The electric dust collector 10 of this embodiment has a structure in which the dust collecting electrode 15 and the discharge electrode 11 are installed in two upper and lower stages. In the present embodiment, an opening reinforcing material 21 for reinforcing the strength is provided at the center of the opening 16.

  In order to renew the electrostatic precipitator 10, it is necessary to take out the old dust collecting electrode 15 and discharge electrode 11, carry in the electrode set 14, and make the dust collecting electrode 15 and discharge electrode 11 new. is there. In this embodiment, an operation procedure for carrying in the electrode set 14 and making the dust collection electrode 15 and the discharge electrode 11 new will be described. However, when the old dust collection electrode 15 and the discharge electrode 11 are taken out, this operation is performed. The procedure should be reversed.

  At the time of carrying-in, the electrode set 14 in which the discharge electrode 11 is connected to the dust collecting electrode 15 by the wire 17 is passed through the hole 15b of the beam 15a of the dust collecting electrode 15 by the hook 23 at the tip of the wire 22 of the crane (not shown). The wire is pulled by the wire 24, and is brought onto the electrode set retracting base 20 leaning under the opening 16. The electrode set retracting base 20 is leaned at a predetermined angle so as to be in contact with the lower end of the opening 16.

  Then, with the tip of the electrode set 14 entering the dust collecting chamber of the electrostatic precipitator 10 through the opening 16, the bolt 42 is connected to the bolt hole 15 b of the beam 15 a of the dust collecting electrode 15 as shown in FIG. 4. Then, the dust collecting electrode 15 and the suspension member 41 are fixed.

  An erection beam 31 and a wire hoist 30 are installed in advance on the ceiling, and the hoist 30 is movable in the direction of the erection beam 31.

  After fixing the electrode set 14 and the suspension member 41, the hoist 30 can be moved up and down and left and right by passing the hook 32 of the hoist 30.

  A roller conveyor 36 is installed on the floor plate 35 on the floor surface, and the electrode set 14 can be rolled and moved thereon.

  FIG. 3 shows a state when the electrode set 14 is taken in this way. Since the electrostatic precipitator 10 of this embodiment uses two upper and lower electrodes in combination, the upper electrode set 14 u and the lower electrode set 14 d are connected and combined while lying on the roller conveyor 36. As shown in FIG. 5, the shackle 45 is passed through the upper electrode set 14 u and the bolt 46 passed through the lower electrode set 14 d is pulled by the shackle 45.

  The dust collection chamber of the electric dust collector 10 has a dust collection chamber 60 s on the left side and a dust collection chamber on the right side when viewed from the direction of the exhaust gas inlet 50 with the breath 65 provided in the center of the center left and right. It consists of chamber 60r.

  The dust collection chamber 60 s is the back side when viewed from the opening 16, and the dust collection chamber 60 r is the front side when viewed from the opening 16. When bringing the electrode set 14 from the opening 16 into the dust collection chamber 60s on the back side, it is necessary to pass between the braces. FIG. 6 is a diagram showing a state at this time. The electrode set 14 passes through the lower space of the X-shaped brace 65, and is carried by the roller conveyor 36 from the dust collection chamber 60r to the dust collection chamber 60s. Therefore, it is not necessary to remove the brace 65 at this time.

  Then, the electrode set 14 brought into the dust collection chamber 60s and combined vertically is pulled up by the hoist 30 and the suspending member 41 is removed. As shown in FIG. It is suspended through the bolt hole 15b of the beam 15a of the dust collecting electrode 15 by a hook-shaped J-bolt 72 and a U-shaped U-bolt 74 hanging from the electrode suspension beam 70 passed through the part. The J bolt 72 is suspended with its tips facing each other. Here, as shown in FIG. 7A, since only the electrode set 14 at the end is installed at a regular position, a U-bolt 74 is used.

  FIG. 7A shows a temporary state for installation, and the J bolt 72 is used to increase the width to secure the work space in the dust collection chamber 60s. Is. When all the electrode sets 14 have been carried, as shown in FIG. 7B, all the J bolts 72 are replaced with the main U bolts 74, and the dust collecting electrodes 15 and the discharge electrodes 11 are installed at equal intervals. Rearranged as follows. Although the discharge electrode 11 is not shown in the drawing, the support provided on the discharge electrode frame 11a is supported by the discharge electrode frame, and the whole is supported by the insulator, thereby being electrically insulated from the casing and suspended. Installed.

Next, the process of the electrode installation method of the electrostatic precipitator according to the present embodiment will be described with reference to FIGS. 8A to 8C.
8A to 8C are schematic views showing an electrode set installation method.

  First, the upper electrode set 14u corresponding to the upper part is placed on the electrode set drawing base 20 and the upper end is taken into the dust collection chamber 60r from the opening 16 (FIG. 8A (a)). Then, the suspending member 41 is attached to the upper electrode set 14u, the hook 32 of the hoist 30 is hooked, pulled by the hoist 30 (FIG. 8A (b)), and completely taken (FIG. 8A (c)). Thereafter, the suspension member 41 is removed, the upper electrode set 14u is laid down (FIG. 8A (d)), and the upper electrode set 14u is moved by the roller conveyor 36 (FIG. 8A (e)). Similarly, the lower electrode set 14d is taken and moved to the vicinity of the upper electrode set 14u (FIGS. 8A (f) to (i)). Then, as shown in FIG. 5, the upper electrode set 14u and the lower electrode set 14d are connected and combined (FIG. 8A (j)). Then, the electrode sets 14u and 14d in a pair are moved by the roller conveyor 36 (FIG. 8A (k)), taken into the dust collecting chamber 60s from the dust collecting chamber 60r through the lower space of the breath 65, and again, The suspension member 41 is attached to the upper electrode set 14u, and the hook 32 of the hoist 30 is hooked and pulled up by the hoist 30 (FIGS. 8A (l) (m)). And it moves to the end of the dust collection chamber 60s with the hoist 30 (FIG. 8A (n)). Thereafter, the suspension member 41 is removed and suspended from the electrode suspension beam 70 by the J bolt 72 (FIG. 8A (o)). Then, the capturing of the next upper electrode set 14u and lower electrode set 14d is started (FIG. 8B (p)).

  When a predetermined number of images are taken in, the state shown in FIG. 8C (q) is obtained. Finally, all the J bolts of the suspended electrode set 14 are changed to U bolts, and the wire 17 is removed to collect dust. The electrode sets 14 are arranged so as to be equally spaced in the chamber 60s (FIG. 8C (r)), and the shackles connecting the upper and lower stages of the dust collecting electrode 15 and the discharge electrode 11 are replaced with regular connecting parts. Thus, an electrode is formed.

  The electrode installation method for the dust collection chamber 60r is exactly the same except that the moving distance is different and that it does not pass between the breaths 65.

  Finally, the opening 16 formed on the side surface of the casing 12 is closed and returned to its original position.

  The process for carrying in the electrode has been described above. However, when the electrode is taken out, the process may be reversed from FIG. 8C (r) to FIG. 8A (a). At this time, the electrode set 14 is carried by the roller conveyor from the dust collection chamber 60s to the vicinity of the opening 16 of the dust collection chamber 60r through the breath 65. After the coupling is broken and the electrode set 14 is separated into the upper electrode set 14 u and the lower electrode set 14 u, the lower electrode set 14 d is first drawn out of the dust collection chamber by the hoist 30, and then the upper electrode set 14 u is collected by the hoist 30. Pull out from the dust chamber.

  In addition, the method for replacing the electrode of the electrostatic precipitator described in the present embodiment is mainly intended for installation at the time of renewal due to aging of the electrode, etc., but is also applicable to a newly installed electrostatic precipitator. can do.

  DESCRIPTION OF SYMBOLS 10 ... Electric dust collector, 11 ... Discharge electrode, 11a ... Discharge electrode frame, 11b ... Horizontal frame, 11c ... Discharge wire, 12 ... Casing, 14, 14u, 14d ... Electrode set, 15 ... Dust collection electrode, 15a ... Beam 15 ... Bolt hole, 16 ... Opening, 17 ... No. wire, 20 ... Electrode set retracting base, 22 ... Wire, 23 ... Hook, 24 ... Wire, 30 ... Hoist, 31 ... Erection beam, 35 ... Base plate, 36 ... Roller Conveyor, 42 ... bolt, 41 ... suspending member, 45 ... shackle, 46 ... bolt, 50 ... exhaust gas inlet, 60s, 60r ... dust collection chamber, 65 ... brace, 70 ... electrode suspension beam, 72 ... J bolt, 74 ... U bolts.

Claims (7)

In the method of replacing the electrode of the electrostatic precipitator, in which each of the dust collector electrode and the discharge electrode is opposed to each other and the dust is collected by an electrode separated into an upper electrode and a lower electrode ,
From the opening provided in the lower part of the casing side surface of the electric dust collector, the upper electrode in which a pair of dust collecting electrode and discharge electrode is set is carried into the casing,
Move the upper electrode, which is a set of the dust collecting electrode and the discharge electrode, toward the opposite side surface of the casing on the bottom surface of the casing,
Next, a pair of dust collecting electrodes carried from the opening and a lower electrode in which a discharge electrode is set, and the moved upper electrode are connected,
The suspended beam of the dust collection electrode is suspended at an interval smaller than the normal installation width.
Electrode replacement method of an electrostatic precipitator, characterized in that repositioning each dust collection electrode and the discharge electrode to the mounting position of the normal to the upper electrode and the lower electrode after all carry-in completion. In the electrode replacement method of the electrostatic precipitator in which the dust collecting electrode and the discharge electrode face each other to collect dust,
(1) A step of creating an integrated electrode set by connecting the dust collection electrode and the discharge electrode;
(2) a step of forming an opening in a lower portion of a casing surface which is a side surface when viewed from the exhaust gas inlet;
(3) A step of providing a gantry with an inclination of a predetermined angle so as to be in contact with the lower end of the opening portion, standing the electrode set on the gantry, and taking the upper end of the electrode set into the dust collection chamber from the opening portion;
(4) A step of attaching a hoist to the upper end of the electrode set taken into the dust collection chamber;
(5) A step of drawing the electrode set into the dust collection chamber by the hoist;
(6) A step of laying an electrode set drawn into the dust collection chamber on a roller conveyor installed on the floor surface;
(7) The step of moving the electrode set by the roller conveyor,
(8) A step of attaching a hoist to the upper end of the electrode set;
(9) The step of pulling up the electrode set by the hoist,
(10) The step of removing the hoist hook and suspending one end of the electrode set by a bolt on the electrode suspension beam;
(11) separating the dust collection electrode and the discharge electrode of the electrode set, and forming the dust collection electrode and the discharge electrode at regular positions;
(12) closing the formed opening,
After the steps (1) and (2), the steps (3) to (10) are performed a predetermined number of times in this order, and then the steps (11) and (12) are performed. Electrode dust collector electrode replacement method. In the electrode replacement method of the electrostatic precipitator in which the dust collecting electrode and the discharge electrode face each other to collect dust,
(1) A step of creating an integrated electrode set by connecting the dust collection electrode and the discharge electrode;
(2) a step of forming an opening in a lower portion of a casing surface which is a side surface when viewed from the exhaust gas inlet;
(3u) a step of providing a pedestal at a predetermined angle so as to contact the lower end of the opening, standing the upper electrode set on the pedestal, and taking the upper end of the upper electrode set into the dust collection chamber from the opening;
(4u) A step of attaching a hoist to the upper end of the upper electrode set taken into the dust collection chamber;
(5u) drawing the upper electrode set into the dust collection chamber by the hoist;
(6u) laying the upper electrode set drawn into the dust collection chamber on a roller conveyor installed on the floor;
(7u) a step of moving the upper electrode set by the roller conveyor;
(3d) a step of standing a lower electrode set on the gantry and taking an upper end of the lower electrode set into the dust collection chamber from the opening;
(4d) A step of attaching a hoist to the upper end of the lower electrode set taken into the dust collection chamber;
(5d) drawing the lower electrode set into the dust collection chamber by the hoist;
(6d) laying on the roller conveyor so that the upper end of the lower electrode set drawn into the dust collection chamber is placed near the lower end of the upper electrode set;
(13) A step of connecting and integrally forming a lower end of the upper electrode set and an upper end of the lower electrode set;
(8a) A step of attaching a hoist to the upper end of the electrode set formed as a single unit,
(9a) A step of pulling up the electrode set formed as an integral piece by the hoist,
(10a) removing the hoist hook and suspending one end of an electrode set formed integrally with the electrode suspension beam by a bolt;
(11) A step of separating the dust collecting electrode and the discharge electrode of the electrode set formed as an integral unit, and forming the dust collection electrode and the discharge electrode at regular positions;
(12) closing the formed opening,
After the steps (1) and (2), the steps (3u) to (7u), (3d) to (6d), (13), (8a) to (10a) ) Is performed a predetermined number of times in this order, and then the steps (11) and (12) are performed thereafter. The bolt in the step (10a) is a J bolt or a U bolt,
The method further comprises the step of rearranging the positions of the integrally formed electrode set in the dust collection chamber and replacing the J bolt with the U bolt before the step (11). An electrode replacement method for an electrostatic precipitator according to claim 2 or claim 3. In the electrode replacement method of the electrostatic precipitator in which the dust collecting electrode and the discharge electrode face each other to collect dust,
(O1) a step of forming an opening in a lower portion of a casing surface that is a side surface when viewed from the exhaust gas inlet;
(O2) A step of removing the discharge electrode and creating an electrode set integrated with the opposing dust collection electrode;
(O3) a step of removing a bolt that hangs the electrode set on an electrode suspension beam;
(O4) A step of attaching a hoist to the upper end of the electrode set;
(O5) A step of pulling down the electrode set by the hoist,
(O6) removing a hoist hook attached to the upper end of the electrode set;
(O7) laying down the electrode set on a roller conveyor installed on the floor surface,
(O8) A step of moving the electrode set by the roller conveyor,
(O9) A step of attaching a hoist to the upper end of the electrode set;
(O10) The step of pulling out the electrode set from the dust collection chamber by the hoist,
(O11) removing a hoist hook from the upper end of the electrode set drawn out from the dust collection chamber;
(O12) a step of providing a gantry with an inclination of a predetermined angle so as to be in contact with the lower end of the opening, standing the electrode set on the gantry, and taking out the electrode set from a dust collection chamber;
The method for replacing an electrode of an electrostatic precipitator, wherein the steps (O4) to (O12) are performed a predetermined number of times after the steps (O1) to (O3). In the method of replacing the electrode of the electrostatic precipitator that collects dust with the dust collecting electrode and the discharge electrode facing each other,
(O1) a step of forming an opening in a lower portion of the casing surface which is a side surface when viewed from the exhaust gas inlet;
(O2) A step of removing the discharge electrode and creating an electrode set integrated with the opposing dust collection electrode;
(O3) a step of removing a bolt that hangs the electrode set on an electrode suspension beam;
(O4) A step of attaching a hoist to the upper end of the electrode set;
(O5) A step of pulling down the electrode set by the hoist,
(O6) removing a hoist hook attached to the upper end of the electrode set;
(O7) laying down the electrode set on a roller conveyor installed on the floor surface,
(O8) A step of moving the electrode set by the roller conveyor,
(O13) A step of separating the electrode set into an upper electrode set and a lower electrode set,
(O14d) A step of attaching a hoist to the upper end of the lower electrode set;
(O15d) The step of pulling out the lower electrode set from the dust collection chamber by the hoist,
(O16d) removing a hoist hook from the upper end of the lower electrode set drawn out from the dust collection chamber;
(O17d) providing a pedestal with a predetermined angle so as to contact the lower end of the opening, standing the lower electrode set on the pedestal, and taking out the lower electrode set from a dust collection chamber;
(O14u) A step of attaching a hoist to the upper end of the upper electrode set in the dust collection chamber;
(O15u) The step of pulling out the upper electrode set from the dust collection chamber by the hoist,
(O16u) The step of removing the hook of the hoist from the upper end of the upper electrode set drawn out from the dust collection chamber,
(O17u) providing a pedestal with a predetermined angle so as to contact the lower end of the opening, standing the upper electrode set on the pedestal, and taking out the upper electrode set from a dust collection chamber;
After the steps (O1) to (O3), the steps (4) to (8), the step (O13), the steps (O14d) to (O17d), the (O14u) to the above electrostatic Gokuto replacement method electrostatic dust device characterized by the steps of (O17u) performs predetermined times. The bolt in the step (O4) is a U bolt,
The method further comprises the step of replacing a part of the U-bolt with a J-bolt, rearranging the position of the electrode set in the dust collection chamber, and width-adjusting before the step (O4). 5 or Gokuto replacement method electrodeposition electric precipitator according to claim 6.

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