JP2013150937A - Electrode renewal method for electrostatic precipitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode renewal method for an electrostatic precipitator by performing partial renewal in accordance with an exhaustion level of electrodes.SOLUTION: In an electrode renewal method for an electrostatic precipitator, exchanging dust collecting electrode plates of one of upper and lower stages of the electrostatic precipitator in which dust collecting electrodes plate and discharge frames are disposed opposite each other and suspended at predetermined intervals in each of the upper and lower stages, the method includes: a step of moving the discharge frames of the stage to be exchanged to the other stage; a step of carrying the dust collecting electrode plate of the stage to be exchanged out of an opening; a step of carrying new dust collecting electrode plates of the same number as the carried out dust collecting electrode plates into the stage from the opening to install them; and a step of moving the discharge frames that have moved to the other stage and causing them to be opposed to the exchanged new dust collecting electrode plates to perform the installation.

Description

  TECHNICAL FIELD The present invention relates to a method for exchanging a dust collecting electrode and a discharge electrode of an electric dust collector, and particularly suitable for performing partial replacement of a dust collecting electrode in an electric dust collector. The present invention relates to an electrode update method for an apparatus.

  This type of electrostatic precipitator is used, for example, to remove soot in boiler exhaust gas from thermal power plants and exhaust gas from various furnaces. The schematic structure will be described with reference to FIGS.

  1 and 2, the electrostatic precipitator includes a casing 10, a hopper 11 below the casing 10, a large number of discharge frames (discharge electrodes) 12 and a large number of dust collection electrodes arranged in the casing 10. The exhaust gas introduced mainly into the casing 10 from the inlet 14 is removed by the principle of electrostatic dust collection and discharged from the outlet 15. The collected dust falls into the hopper 11 and is taken out from the discharge port 16 by a mechanism (not shown).

  The casing 10 is divided into an upstream dust collection area a and a downstream dust collection area b. For convenience of explanation, FIG. 1 shows a state in which the dust collecting electrode plate 13 is suspended from a pair of large beams 17 and 17 in the upper part of the casing 10 in the upstream dust collecting region a, and a discharge frame (discharge electrode needle) in the downstream dust collecting region b. 12 is suspended from a lever 18 via a suspension frame 19. However, in practice, the upstream dust collection area a and the downstream dust collection area b have the same configuration, and each of the dust collection areas a and b has a large number of discharge frames with a predetermined interval as shown in FIG. 12 and a large number of dust collecting electrode plates 13 are alternately arranged.

  In a large electrostatic precipitator, the size of the electrodes is several meters in the horizontal length and several tens of meters in the vertical length, and each electrode has a two-stage structure composed of two stages. There is a thing made into an electrode. This is configured by dividing each electrode into two upper and lower stages and suspending the same kind of upper and lower two stages connected in series.

  The electrostatic precipitator needs to be renewed to a new electrode because the dust collecting electrode plate and the discharge frame deteriorate due to aging and corrosion due to long-term operation and the dust collecting function is lowered. As a conventional method for installing an electrode for an electrostatic precipitator, for example, as disclosed in Patent Document 1, an opening is provided in the ceiling of the casing of the electrostatic precipitator, and the electrode is taken in and out from the opening. . In Patent Document 1, when an electrode is taken in and out, a box body that accommodates the number of elements required to constitute the electrode is used, and this box body is suspended by a crane to carry in and carry out the work.

  In addition, as a renewal method, for example, as shown in Patent Document 2, there is known a method in which an opening is provided in an upper part of a side surface of a casing and an electrode is taken in and out from the opening.

JP 2001-145841 A Japanese Patent Laid-Open No. 7-096214

  The electrode renewal methods of the electrostatic precipitator according to the above prior art are all methods for renewing all electrodes. Therefore, conventionally, even when a part of the elements constituting the electrode is deteriorated and damaged to reach the end of its life, the entire electrode is replaced, resulting in an increase in the construction cost.

  In the electrostatic precipitator using the two-stage structure electrode composed of the upper and lower electrodes described above, when the dust adhering to the dust collecting electrode plate is removed, the dust on the upper dust collecting electrode plate Since it passes through the dust collecting electrode plate, the lower dust collecting electrode plate is easily soiled. In order to remove the dust collected on the dust collecting electrode plate, the cleaning liquid is flowed from above, but the lower dust collecting electrode plate is more consumed than the upper dust collecting electrode plate due to the flow of the cleaning liquid.

  As described above, the electrode renewal method for the electrostatic precipitator according to the prior art is a method for renewing all the electrodes. In this method, in the case of the electrostatic precipitator using the above-described two-stage structure electrode, the upper dust collecting electrode that can still be used is also updated, so that the cost for renewing the electrostatic precipitator increases and is long. There was a problem of requiring a work period.

  The present invention provides an electrode renewal method for an electrostatic precipitator by performing a partial renewal according to the degree of electrode wear in view of the above-described problems of the prior art.

In order to solve the above problems, the present invention provides a dust collecting electrode on one of the upper and lower stages of the electrostatic precipitator in which the dust collecting electrode and the discharge frame are opposed to each other on the upper stage and the lower stage. In the electrode renewal method of the electrostatic precipitator to be replaced,
Providing an opening in the casing of the electric dust collector;
Moving the discharge frame of the stage to be exchanged to the other stage;
A step of carrying out the dust collecting electrode to be exchanged in the stage from the opening;
A step of carrying in and installing the same number of new dust collecting electrodes as the unloaded dust collecting electrodes to the stage from the opening;
A step of installing the discharge frame moved to the other stage so as to face the new dust collecting electrode exchanged by moving to the stage;
It is characterized by having.

Moreover, in the electrode renewal method of the electrostatic precipitator described above,
A step of shifting the positions of the upper and lower discharge frames is included before the step of moving the discharge frame of the relevant stage to be exchanged to the other stage.

Moreover, in the electrode renewal method of the electrostatic precipitator described above,
Before the step of moving the discharge frame of the relevant stage to be exchanged to the other stage, a step of shifting each dust collecting electrode and the discharge frame in the direction opposite to the opening is included.

Moreover, in the electrode renewal method of the electrostatic precipitator described above,
The lower dust collector electrode of the electric dust collector
Moving the lower discharge frame to the upper stage;
Carrying out the lower dust collecting electrode from the opening;
A step of carrying in and installing the same number of new dust collecting electrodes as the unloaded dust collecting electrodes in the lower stage from the opening;
A step of placing the discharge frame moved to the upper stage facing the new dust collecting electrode which has been moved to the lower stage and replaced;
It is characterized by having.

Moreover, in the electrode renewal method of the electrostatic precipitator described above,
The upper dust collecting electrode of the electric dust collector is to be replaced,
Moving the upper discharge frame to the lower stage;
Carrying out the upper dust collecting electrode from the opening;
A step of carrying in and installing the same number of new dust collecting electrodes as the unloaded dust collecting electrodes in the upper stage from the opening,
Installing the discharge frame moved to the lower stage facing the new dust collecting electrode that has been moved to the upper stage and replaced;
It is characterized by having.

Moreover, in the electrode renewal method of the electrostatic precipitator described above,
When carrying out the upper dust collection electrode from the opening, the upper dust collection electrode is carried out by passing between the lower dust collection electrode and the discharge frame.

  According to the present invention, by partially renewing the dust collecting electrode, renewal work can be performed at low cost in a short period of time, and the operating efficiency of the electric dust collecting device can be increased.

It is side sectional drawing which shows the general structure of an electrical dust collector. It is an AA arrow line view of FIG. It is an arrangement view of the electrostatic precipitator using the two-stage structure electrode of the first embodiment and the second embodiment of the present invention. Similarly, it is explanatory drawing which temporarily moves the lower discharge frame to the upper stage. It is explanatory drawing which disassembles and removes a lower dust collection electrode plate similarly. It is explanatory drawing of completion of dismantling removal of the lower dust collecting electrode plate similarly. It is explanatory drawing of the movement to a carrying-in, an assembly, and regulation position of a lower dust collecting electrode board similarly. It is explanatory drawing which attaches the lower dust collection electrode plate similarly carried in. It is explanatory drawing which lowers and attaches the discharge frame temporarily moved to the upper stage similarly. It is explanatory drawing which temporarily moves the discharge frame of the upper stage of this invention Example 2 to the lower stage. It is explanatory drawing which disassembles and removes an upper stage dust collection electrode plate similarly. It is explanatory drawing of completion of dismantling removal of the upper stage dust collection electrode plate similarly. It is explanatory drawing of a movement to carrying in, an assembly, and a regulation position of an upper dust collecting electrode board similarly. Similarly, it is explanatory drawing which pulls up and attaches the discharge frame temporarily moved to the lower stage.

  FIG. 3 is a layout diagram of the electrostatic precipitator using the two-stage structure electrode before electrode renewal according to Embodiment 1 of the present invention. The electrostatic precipitator is mainly composed of a two-stage dust collecting electrode plate (dust collecting electrode, hereinafter referred to as electrode plate) and a discharge frame (discharge electrode). The electrode plate includes an upper electrode plate 21 and a lower electrode plate 22. The discharge frame includes an upper discharge frame 23 and a lower discharge frame 24. Many upper electrode plates 21 are suspended from electrode suspension beams 26 by suspension bolts (U bolts) 25 and their lower ends are connected to the lower electrode plates 22 via shackles 27. The discharge frames 23 and 24 are suspended at the upper and lower side ends by being supported by the frames 28 and 29 via supports (not shown). The frames 28 and 29 are suspended from the support insulator 18 and are electrically insulated from the grounding side such as the casing 10 and the dust collecting electrode plates 21 and 22.

  As described above, the electrode plate and the discharge frame are deteriorated by long-term operation of the electrostatic precipitator due to aging or corrosion. The electrode plate deteriorates faster than the discharge frame, and the lower electrode plate deteriorates faster than the upper electrode plate in the two-stage structure electrode. Accordingly, the deterioration of the electrodes proceeds in the order of the lower electrode plate and the upper electrode plate. In such a case, when the deteriorated electrode plate is replaced with a new electrode plate, the dust collecting function is restored, and the electric dust collecting device can exhibit performance without problems. In the first embodiment, only the lower electrode plate 22 is replaced among the upper and lower electrode plates. The work procedure will be described below.

  First, as shown in FIG. 3, a work floor 33 on which workers and equipment used for renewal work are placed is installed above the hopper 11 and below the lower electrode plate. Next, as shown in FIG. 4, an opening 32 for carrying out and carrying in the electrode plate is provided in the inclined portion of the hopper 11. In addition, the installation timing of this opening part 32 is not restricted at this time, and should just be before carrying out and carrying in of an electrode plate.

  As shown in FIG. 4, a moving beam 31 is temporarily installed on the lower surface of the upper beam 20, and a temporary chain block 30 is attached to the beam so as to be movable in the lateral direction of the arrow.

  Next, in order to secure a work area above the opening 32, the electrodes (electrode plates, discharge frames) in the area are moved while being individually lifted by the chain block 30. Thus, the upper and lower electrodes (electrode plates, discharge frames) are changed from the arrangement shown in FIG. 3 to the arrangement shown in FIG. A work scaffold is then installed in the area formed by this offset movement.

  After moving, the upper electrode plate 21 to be displaced is suspended from the electrode suspension beam 26 by a temporary suspension bolt 25 ′ so that two sets of each electrode (electrode plate, discharge frame) are suspended in one set. The lower discharge frame 24 at the other position is temporarily suspended from the upper discharge frame 23 at the upper part, with support members (not shown) on both sides cut. Note that the support members on both sides of both the upper discharge frame 23 and the lower discharge frame 24 may be cut and temporarily suspended on the upper frame.

  In the replacement work of the lower electrode plate 22, the lower discharge frame 24 is retracted to the upper stage as shown in FIG. 4 in order to provide a work area for the lower electrode plate 22. This evacuation operation is performed by hanging the lower discharge frame 24 in a movable state with a wire (not shown) and pulling it up by the chain block 30. After the lifting, it is temporarily suspended on the upper discharge frame 23 or the upper frame 28. Before the upper discharge frame 24 is pulled upward, the upper discharge frame 23 and the lower discharge frame 24 are preliminarily shifted laterally so as not to collide with the upper discharge frame 23, and the lower discharge frame 24 is retracted. Can be secured.

  As shown in FIG. 4, when the lower discharge frame 24 is lifted upward, only the lower electrode plate 22 becomes the lower stage. Next, as shown in FIG. 5, the shackle 27 connecting the upper dust collecting electrode plate 21 and the lower dust collecting electrode plate 22 is removed, and the lower dust collecting plate 22 is gradually lowered by hooking on the hook of the chain block 30. . The lower dust collecting electrode plate 22 is cut to a size that can be carried by the work floor 33 manually. The lower dust collecting plate 22 is finally removed from the shackle 27 and carried out from the opening 32. The removed upper dust collecting plate 21 is lifted back by the chain block 30 and suspended by the electrode suspension beam 26.

  By repeating the above operation, each lower electrode plate 22 is cut, and the cut piece is carried out from the opening 32. FIG. 6 shows a state where the removal of the lower electrode plate 22 is completed.

FIG. 7 illustrates the operation of loading a new lower electrode plate, assembling it, and moving it to a specified position.
In FIG. 7, a beam 34 for temporarily suspending and moving a new lower electrode plate 22a to be carried in is temporarily installed. A plurality of trolleys 35 are placed on the beam 34, and the trolleys 35 can move laterally on the beam. Reference numeral 36 denotes an electrode plate suspension fitting fixedly suspended from the trolley 35.

  Next, a work scaffold 37 is installed in an area formed by the offset movement of the electrodes (discharge frame, electrode plate). The installation timing may be any time after the area is formed by the offset movement.

  The carrying-in operation is performed by pulling up the new lower electrode plate 22a carried in from the opening 32 by applying a wire extending from the chain block 30. When the upper end of the lower electrode plate 22 a reaches the beam 34 by this pulling up, the upper end of the lower electrode plate 22 a is replaced with the electrode plate hanging bracket 36 of the trolley 35 by the operator of the work scaffold 37 and is suspended by the trolley 35. By repeating the above operation, the same number of new lower electrode plates 22 a as the number of unloaded lower electrode plates 22 are suspended from the trolley 35. Thereafter, each new lower electrode plate 22a is moved to the position of the corresponding upper dust collecting electrode by moving each trolley 35 laterally.

  As shown in FIG. 8, the moved lower electrode plates 22 a are switched from the trolley 35 to the wires of the chain block 30, and are further pulled up one by one to be switched to the shackle 27 of the upper electrode plate 21. Each new lower electrode plate 22a is arranged at a predetermined position in the vertical direction by being replaced with the shackle 27 of all the upper electrode plates 21. Beam 34 and trolley 35 are then removed.

  Next, although not shown, the work floor 33 and the work scaffold 37 are removed, and the upper electrode plate 21, the upper discharge frame 23, and the lower discharge frame 24 that have been moved in the upper and lower stages are respectively lateralized by the chain block 30. Move to the original position in the direction. The lower electrode plate 22a moves laterally together with the upper electrode plate 21, and is arranged at a specified position in the horizontal direction. The upper discharge frame 23 is attached and fixed to the upper frame 28.

  Thereafter, as shown in FIG. 9, the lower discharge frame 24 retracted to the upper stage is removed from the temporary suspension to the upper discharge frame 23 or the upper frame 28, suspended from the chain block 30, and lowered to lower electrode plate 22a. It is arranged so as to face a specified position between the two. The lower discharge frame 24 is attached and fixed to the lower frame 29 at this specified position. Thus, the replacement operation from the lower electrode plate 22 to the new lower electrode plate 22a in the first embodiment is completed, and the state shown in FIG. 3 is obtained.

  In the first embodiment, only the lower dust collecting plate is replaced among the upper and lower dust collecting plates. If the electrostatic precipitator is operated for a long time in the state where the lower electrode plate is replaced in Example 1, the next deterioration is the upper electrode plate, and the upper electrode plate needs to be replaced. In the second embodiment, an operation procedure for exchanging only the upper electrode plate will be described with reference to FIGS.

  10-14, the same code | symbol is attached | subjected to the same part as Example 1. FIG. The state before the electrode replacement operation of Example 2 is shown in the layout diagram of the electrostatic precipitator using the two-stage structure electrode of FIG.

  In FIG. 10, first, a work floor 33 on which an operator and equipment used for renewal work are placed is installed above the hopper 11 and below the lower dust collecting plate. Next, the electrode plate and the discharge frame in the state shown in FIG. And the work scaffold 37 is installed in the area formed by this offset movement.

  Next, in order to provide an exchange work area for the upper dust collecting plate 23, the upper discharge frame 23 is retracted to the lower stage. First, the support members (not shown) on both sides are cut to bring the upper discharge frame 21 into a movable state. As shown in FIG. 10, the evacuation operation is performed by suspending the movable upper discharge frame 23 with a wire (not shown) and lowering it to the lower stage by the chain block 30. In addition, before lowering the upper discharge frame 23, the lower discharge frame 24 and the upper discharge frame 23 may be shifted laterally so as to secure a retreat area for the upper discharge frame 23 so as not to collide with the lower discharge frame 24. it can. The upper discharge frame 23 lowered to the lower stage is temporarily suspended by the lower discharge frame 24 or the lower frame 29.

  Next, as shown in FIG. 11, each lower electrode plate 22 is separated from the connection with each upper electrode plate 21 by the shackle 27 and is temporarily suspended together with the shackle 27 on the upper frame 28.

  FIG. 11 shows the work of dismantling and removing the upper electrode plate 21. Each upper electrode plate 21 separated from each lower electrode plate 22 is gradually lowered to the work floor 33 by the chain block 30. At this time, the upper electrode plate 21 is moved in the lateral direction by the chain block 30 so as not to collide with the lower electrode plate 22, and is lowered in the space generated by the above-mentioned shifting. The upper electrode plate 21 suspended to the work floor 33 is cut into a size that can be carried by human power, finally removed from the chain block 30 and carried out from the opening 32. FIG. 12 shows a state where the removal of the upper electrode plate 21 is completed.

  FIG. 13 shows an operation of loading a new upper electrode plate 21a, assembling it, and moving it to a specified position. In FIG. 13, the beam 34 for suspending and moving the new upper electrode plate 21a carried in is temporarily installed in the upper stage. A plurality of trolleys 35 are mounted on the beam 34, and the trolley 35 can move on the beam 34.

  In carrying-in work, the wire extended from the chain block 30 is hung on the new upper electrode plate 21a carried in from the opening 32 and pulled up. When the upper end of the new upper electrode plate 21 a reaches the beam 34, the worker of the work scaffold 37 changes the wire of the chain block 30 to the hanging bracket of the trolley 35 and hangs on the trolley 35. By repeating this operation, the same number of new upper electrode plates 21 a as the upper electrode plates 21 carried out are suspended from the trolley 35. Thereafter, each new upper electrode plate 21a is moved to a temporary position in the horizontal direction by moving each trolley 35 in the horizontal direction.

  Each upper electrode plate 21 a moved to the temporary position is connected via a shackle 27 to a lower electrode plate 22 whose lower end is temporarily suspended by a frame 28. This is performed by removing the temporarily suspended lower electrode plate 22 from the frame 28 by the chain block 30 and replacing the shackle 27 with the upper electrode plate 21a.

  Thereafter, as shown in FIG. 14, the new upper electrode plate 21 a is suspended from the electrode suspension beam 26 by the suspension bolt 25. The beam 34 and the trolley 35 are removed thereafter.

  Next, although not shown in the drawing, the work floor 33 and the work scaffold 37 are removed, and the upper electrode plate 21a, the upper discharge frame 23, and the lower discharge frame 24, which have been moved in the upper and lower stages, are respectively chained. The block 30 is moved laterally to return to the original specified position. The lower electrode plate 22 moves laterally together with the upper electrode plate 21a and is disposed at a specified position in the horizontal direction.

  Thereafter, as shown in FIG. 14, the upper discharge frame 23 that has been retracted to the lower stage is lifted by the chain block 30 and disposed so as to face a predetermined position between the upper electrode plates 21 a. The upper discharge frame 23 is attached and fixed to the upper frame 28 at this specified position. As described above, the replacement work from the upper electrode plate 21 to the new upper electrode plate 21a in Example 2 is completed, and each electrode is in the state shown in FIG.

  Compared with Example 1, in this Example 2, when the upper electrode plate 21 is removed, it passes through the lower stage, so as shown in FIG. 11, all the electrodes (upper electrode plate, lower electrode plate, upper discharge frame, It is necessary to secure the area of the lower discharge frame. These position adjustments are performed by preliminarily determining a temporary suspension position of each electrode, and lifting the position by the chain block 30 and moving it sideways.

  DESCRIPTION OF SYMBOLS 11 ... Hopper (casing), 20 ... Upper beam, 21, 22 ... Dust collection electrode plate, 21 ... Upper dust collection electrode plate, 21a ... New upper dust collection electrode plate, 22 ... Lower dust collection electrode plate, 22a: New lower dust collecting electrode plate, 23, 24 ... Discharge frame, 23 ... Upper discharge frame, 24 ... Lower discharge frame, 25 ... Suspension bolt (U bolt), 26 ... Electrode suspension beam, 27 ... Shackle , 28, 29 ... frame, 30 ... chain block, 32 ... opening, 33 ... work floor, 37 ... work scaffold.

Claims (6)

Electrode dust collector electrodes for which the dust collector electrodes in the upper and lower stages of the electrostatic dust collector, in which the dust collector electrode and the discharge frame are suspended at a predetermined interval in the upper and lower stages, are to be replaced. In the update method,
Providing an opening in the casing of the electric dust collector;
Moving the discharge frame of the stage to be exchanged to the other stage;
A step of carrying out the dust collecting electrode to be exchanged in the stage from the opening;
A step of carrying in and installing the same number of new dust collecting electrodes as the unloaded dust collecting electrodes to the stage from the opening;
A step of installing the discharge frame moved to the other stage so as to face the new dust collecting electrode exchanged by moving to the stage;
An electrode renewal method for an electrostatic precipitator, comprising: In the electrode renewal method of the electrostatic precipitator according to claim 1,
An electrode renewal method for an electrostatic precipitator comprising the step of shifting the position of the upper and lower discharge frames before the step of moving the discharge frame of the relevant stage to be replaced to the other stage. In the electrode renewal method of the electrostatic precipitator according to claim 1 or 2,
An electric current collecting step including moving each dust collecting electrode and the discharge frame in a direction opposite to the opening before the step of moving the discharge frame of the stage to be exchanged to the other stage; Dust device electrode renewal method. In the electrode renewal method of the electrostatic precipitator according to any one of claims 1 to 3,
The lower dust collector electrode of the electric dust collector
Moving the lower discharge frame to the upper stage;
Carrying out the lower dust collecting electrode from the opening;
A step of carrying in and installing the same number of new dust collecting electrodes as the unloaded dust collecting electrodes in the lower stage from the opening;
A step of placing the discharge frame moved to the upper stage facing the new dust collecting electrode which has been moved to the lower stage and replaced;
An electrode renewal method for an electrostatic precipitator, comprising: In the electrode renewal method of the electrostatic precipitator according to any one of claims 1 to 3,
The upper dust collecting electrode of the electric dust collector is to be replaced,
Moving the upper discharge frame to the lower stage;
Carrying out the upper dust collecting electrode from the opening;
A step of carrying in and installing the same number of new dust collecting electrodes as the unloaded dust collecting electrodes in the upper stage from the opening,
Installing the discharge frame moved to the lower stage facing the new dust collecting electrode that has been moved to the upper stage and replaced;
An electrode renewal method for an electrostatic precipitator, comprising: In the electrode renewal method of the electric dust collector according to claim 5,
An electrode renewal method for an electrostatic precipitator, wherein when the upper dust collecting electrode is carried out from the opening, the upper dust collecting electrode is carried out by passing between the lower dust collecting electrode and a discharge frame. .

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