JP3951506B2 - How to replace a moving electrode chain - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for replacing a moving electrode chain of a moving electrode type electrostatic precipitator, and more particularly, a plurality of discharge frames suspended at a predetermined interval in a casing and a plurality of suspensions suspended by a pair of endless chains. The present invention relates to a method for replacing a moving electrode chain of a moving electrode type electrostatic precipitator including a plurality of moving electrodes that form a loop as a whole by a single dust collecting electrode plate and circulate every other discharge frame.
[0002]
[Prior art]
This type of moving electrode type electrostatic precipitator is known as an electrostatic precipitator for removing soot in, for example, boiler exhaust gas from thermal power plants and exhaust gas from various furnaces for iron making. The schematic structure will be described with reference to FIGS.
[0003]
In FIG. 4, the moving electrode type electrostatic precipitator 10 includes a casing 12, a hopper 13 below the casing 12, a number of discharge frames 14 and a number of moving electrodes 15 disposed in the casing 12. The exhaust gas 17 introduced into the casing 12 from the inlet flue 16 is removed by the principle of electrostatic dust collection and discharged from the outlet flue 18. The collected dust falls into the hopper 13 and is taken out from the discharge port 19 by a mechanism (not shown).
[0004]
FIG. 5 is an AA arrow view of FIG. 4, and a number of discharge frames 14 that are suspended at a predetermined interval are suspended in the casing 12. In addition, a large number of moving electrodes 15 that circulate every other discharge frame 14 are provided. 6 is a side view showing the mounting structure of the discharge frame 14, and FIG. 7 is a view taken along the line BB in FIG. The discharge frame 14 is a grid-like frame body 20 in which a large number of discharge wires 21 are stretched, and each discharge frame is placed on an upper beam 25 and a lower beam 26 of a frame 24 suspended from a soot tube 22 via a suspension rod 23. The upper bracket 27 and the lower bracket 28 projecting from 14 are respectively suspended by being locked. Reference numerals 29 and 30 denote a drive wheel and a lower roller of the moving electrode 15.
[0005]
FIG. 8 is a perspective view showing the detailed structure of the moving electrode 15. A pair of endless chains 31, 31 are stretched between the upper drive wheel 29 and the lower roller 30, and the pair of endless chains 31. , 31 are suspended by a plurality of dust collecting electrode plates 32 being locked at the position of the intermediate portion 33 in the width direction, and form a loop as a whole. The shaft 34 of the drive wheel 29 is rotated by a drive mechanism (not shown), and the rotation of the shaft 34 is transmitted to a pair of endless chains 31 and 31 meshing with the drive wheel 29 to form a plurality of dust collecting electrode plates forming the loop. 32 moves around the discharge frame 14 every other turn.
[0006]
The moving electrode type electrostatic precipitator 10 generally has an overall height of 25 to 30 meters. Further, the total length of the moving electrode 15 usually reaches 15 to 25 meters.
[0007]
By the way, when this moving electrode type electrostatic precipitator is operated for a long time, in particular, the pair of endless chains 31 and 31 of the moving electrode 15 are driven in an atmosphere in which dust or corrosive gas exists in some cases. Compared with other members constituting the apparatus, the wear is severe and the life is short. For this reason, it is necessary to periodically replace only the pair of endless chains 31 and 31 among various members constituting the movable electrode 15 shown in FIG.
[0008]
[Problems to be solved by the invention]
However, as shown in FIG. 5, in the moving electrode type electrostatic precipitator, a number of discharge frames 14 and moving electrodes 15 are alternately arranged in parallel at a narrow pitch in the casing 12. Moreover, the total length of the moving electrode 15 usually reaches 15 to 25 meters as described above. Under these conditions, the pair of endless chains 31 and 31 are replaced without moving the positions of the discharge frame 14, the drive wheel 29, and the like, and the original dust collecting electrode plate 32 is replaced with the replaced new endless chain. The replacement work was technically extremely difficult, and was a difficult construction requiring a great deal of time and labor. Usually, this type of electrostatic precipitator is repaired because its repair period is limited due to the operational efficiency of the main plant such as power plants and steelworks, and the above difficult work may be completed within a limited short period of time. There was also a situation that became impossible.
[0009]
An object of the present invention is to solve the above-described problems of the prior art and to provide a method capable of efficiently and quickly performing replacement work for a moving electrode chain in a moving electrode type electrostatic precipitator. .
[0010]
[Means for Solving the Problems]
[0011]
[Means for Solving the Problems]
A moving electrode chain replacement method according to the present invention is provided in a moving electrode type electrostatic precipitator, and a plurality of rectangular pieces are collected on a pair of endless chains extending in the vertical direction between an upper drive wheel and a lower roller. the mobile electrodes obtained by suspending electrode plates, the disconnect endless chain at the bottom position, to connect one end of the new chain to the end of the detached endless chain, these chains through the upper drive wheel The dust collecting electrode plate is sequentially changed from the endless chain to the new chain, and the end of the endless chain and one end of the new chain are separated at the stage where the new chain makes a round, by connecting one end of the new chain and the other end, as well as the new chain with a new endless chain, move the chain When to is engaged the movement restraint means for restricting the movement of the uplink side and downlink respectively side chain of the chain, be circular movement via the upper drive wheel the chain by manipulating these movements restraining means It is characterized by.
[0012]
In addition, the moving electrode chain replacement method according to the present invention is equipped with a moving electrode type electrostatic precipitator, and a plurality of rectangular pieces on a pair of endless chains stretched in the vertical direction between the upper drive wheel and the lower roller. The endless chain of the moving electrode on which the dust collecting electrode plate is suspended is replaced in the order of a to g described below.
a. A movement restraining means for restricting the movement of the chain is attached to at least one of the pair of endless chains, and at least one dust collecting electrode plate at the lowest position is removed from the chain.
b. The pair of endless chains are separated at the lowest position.
c. One end of a new replacement chain is connected to the lower ends of the pair of separated upstream chains.
d. The pair of ascending chains are pulled up together with the new chain by operating the movement restraining means and pulling down the descending chain by at least one of the dust collecting electrode plates.
e. The dust collecting electrode plate is removed from the lower end side of the lowered descending chain, and the already removed dust collecting electrode plate is attached from one end side of the raised new chain.
f. By repeating the operations d and e, the end of the endless chain and the end of the new chain are separated from each other when the one end of the new chain makes a round through the upper drive wheel.
g. Next, the other end of the new chain is connected to one end of the new chain, thereby making this new chain a new endless chain.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an embodiment of the present invention. FIG. 1 is an explanatory diagram showing an initial stage, FIG. 2 is an intermediate stage, and FIG. 3 is a final stage in the embodiment.
[0014]
FIG. 1 (a) shows the configuration of the moving electrode before the chain replacement, and a pair of endless chains 31, 31 are stretched between the upper drive wheel 29 and the lower roller 30 in the vertical direction. In the figure, only one endless chain 31 is shown, and the other endless chain 31 is hidden in a direction perpendicular to the paper surface. In the following explanation, both endless chains are treated in the same manner and replaced. Shall be. A plurality of rectangular dust collecting electrode plates 32A, 32B, 32C,..., 32N are suspended from the endless chain 31. The lower roller 30 is movable up and down along a guide (not shown). The weight of the lower roller 30 acts on the endless chain 31 and the endless chain 31 is in tension.
[0015]
FIG. 1B shows the first stage of the replacement work. First, as a means for restraining the movement of the endless chain 31, the left and right sides of the endless chain 31 are restrained by the chain blocks 40 and 41. By pulling the chain 43 with the right chain block 41 while loosening the chain 42 with the left chain block 40, the left side of the endless chain 31 is raised and the right side is lowered. Hereinafter, for convenience of explanation, the left side of the endless chain 31 is referred to as an upstream chain 31A, and the right side is referred to as a downward chain 31B.
[0016]
Next, the load of the lower roller 30 is released from the endless chain 31 by lifting the lower roller 30 along a guide (not shown) and fixing the lower roller 30 at the position shown in the drawing. Thereafter, the two dust collecting electrode plates 32 </ b> A and 32 </ b> B at the lowermost position of the endless chain 31 are removed from the endless chain 31. Next, the endless chain 31 is cut off at the lower position.
[0017]
Next, one end of the replacement new chain 51 is connected to the lower end of the separated up-side chain 31 </ b> A as a connection point 50. Reference numeral 52 denotes a container that houses the new chain 51. FIG. 1B shows a state where the above first stage work has been completed.
[0018]
FIG. 2 (a) shows the second stage of the replacement work. First, from the state of FIG. 1 (b), the chain blocks 40 and 41 are operated to pull down the down chain 31B by one dust collecting electrode plate 32, so that the up chain continuous with the down chain 31B. The side chain 31 </ b> A is pulled up by one sheet of the dust collecting electrode plate 32 together with the new chain 51.
[0019]
Next, the dust collecting electrode plate 32C is removed from the lower end side of the lowered down chain 31B. Next, by the same operation as described above, the descending chain 31B is further lowered by one dust collecting electrode plate 32, the dust collecting electrode plate 32D is removed from the lower end side of the descending chain 31B, and the already collected collector The dust electrode plate 32A is attached from one end side of the raised new chain 51. The lower end side of the downward chain 31B from which the dust collecting electrode plates 32C and 32D have been removed by the above operation is stored in the container 53. FIG. 2A shows a state where the above second stage work has been completed.
[0020]
FIG. 2B shows the third stage of the replacement work. From the state of FIG. 2 (a), the lowering chain 31B is lowered, the dust collecting electrode plate 32 is removed from the lowering chain 31B, and the new chain 51 is pulled up and the dust collecting electrode is applied to the new chain 51, as described above. Repeat the remounting of the plate 32. By repeating this process, the seven dust collecting electrode plates 32E to 32K are further removed from the state shown in FIG. 2A, and the seven dust collecting electrode plates 32B to 32H are reattached to the new chain 51 as shown in FIG. ).
[0021]
FIG. 3 (a) shows the fourth stage of the replacement work. From the state of FIG. 3 (b), the dust collection electrode plate 32 is further removed from the downward chain 31B and the dust collection electrode plate 32 is reattached to the new chain 51 in the same manner as described above. At the stage where the last dust collecting electrode plate 32N is removed, the connection point 50, that is, one end of the new chain 51, goes around the upper drive wheel and reaches a position near the lower roller. Therefore, at this stage, one end of the new chain 51 and the end of the endless chain 31 are separated at the position of the connection point 50. The separated endless chain 31 is stored in a container 53. This state is shown in FIG. 3A, and only the last dust collecting electrode plate 32N has not been reattached to the new chain 51 yet.
[0022]
FIG. 3 (b) shows the fifth stage of the replacement work. From the state shown in FIG. 3A, one end of the new chain 51 is connected to the other end at the end, thereby making the new chain 51 a new endless chain 31. Next, by attaching the dust collecting electrode plate 32N to the new endless chain 31, a moving electrode forming a loop as a whole is completed, and finally the lower roller 30 is pulled down to deposit the load on the new endless chain 31. This completes the replacement work for one unit of moving electrode chain. Thereafter, the chain replacement operation is sequentially performed for a plurality of moving electrodes by the same method.
[0023]
As described in detail above, according to the present embodiment, the replacement operation of the endless chain 31 and the new chain 51 and the replacement operation of the dust collecting electrode plate 32 can be performed very smoothly and systematically. For this reason, the replacement work of the moving electrode chain in the moving electrode type electrostatic precipitator can be efficiently performed in a short time. Further, since the position of the work is limited to the position near the lower roller 30, the work at a high place in the vicinity of the drive roller 29 is not required, and the work can be proceeded safely. In order to perform the work in the vicinity of the lower roller 30 safely, it is natural to build a solid scaffold at this position prior to the work.
[0024]
Moreover, when operating the above-described chain blocks 40 and 41, it is natural to change the chain blocks as necessary. It is sufficient that the chain blocks 40 and 41 are provided on either one of the pair of endless chains 31 and 31 or the pair of new chains 51 and 51. That is, in the present embodiment, these pair of chains are connected by a large number of dust collecting electrode plates 32 at all stages, so that only one chain is reliably moved or restrained so that the other chain Interlocked.
[0025]
In the embodiment, the example in which the two chain blocks 40 and 41 are used as the means for moving or restraining the endless chain 31 or the new chain 51 during the work has been shown. Various means can be used.
Moreover, in the said Example, although the procedure of the replacement | exchange operation | work of a chain was described in detail, as long as it does not deviate from the technical idea of this invention, it does not interfere at all in the procedure.
[0026]
【The invention's effect】
According to the present invention, replacement work for a moving electrode chain in a moving electrode type electrostatic precipitator can be efficiently performed in a short time.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an initial stage in an embodiment of the present invention.
FIG. 2 is a perspective view showing an intermediate stage in the embodiment of the present invention.
FIG. 3 is an explanatory diagram showing a final stage in the embodiment of the present invention.
FIG. 4 is a side sectional view showing a general configuration of a moving electrode type electrostatic precipitator.
FIG. 5 is a view taken along arrow AA in FIG. 4;
FIG. 6 is a side view showing a mounting structure of a discharge frame.
7 is a view taken along arrow BB in FIG. 6;
FIG. 8 is a perspective view showing a detailed structure of a moving electrode.
[Explanation of symbols]
12 ......... Case 13 ......... Hopper 14 ......... Discharge frame 15 ......... Moving electrode 29 ......... Driving wheel 30 ......... Lower roller 31 ......... Endless chain 31A ... Up chain 31B ... Down Side chain 32 ......... Dust collecting electrode plate 40 ......... Chain block 41 ......... Chain block 50 ......... Connection point 51 ......... New chain 52 ......... Container

Claims (2)

For a moving electrode equipped with a moving electrode type electrostatic precipitator and having a plurality of rectangular dust collecting electrode plates suspended on a pair of endless chains extending vertically between the upper drive wheel and the lower roller, said endless chain disconnected in the lowest position, to connect one end of the new chain to the end of the detached endless chain, while these chains is circularly moved through the upper drive wheel, sequentially the dust collecting electrode plate , By replacing the endless chain with the new chain, separating the end of the endless chain from one end of the new chain when the new chain makes a full turn, and then connecting the other end of the new chain to one end of the new chain , respectively the new chain with a new endless chain, in moving the chain to the upstream side and the downstream side of the chain The movement restraint means for restricting the movement of En engaged, how to replace the mobile electrode chain, characterized in that to the circular movement via the upper drive wheel the chain by manipulating these moving restraining means. The above-mentioned endless chain of moving electrodes, which is mounted on a moving electrode type electrostatic precipitator and in which a plurality of rectangular dust collecting electrode plates are suspended from a pair of endless chains extending in the vertical direction between the upper drive wheel and the lower roller Is replaced according to the order of a to g described below.
a. A movement restraining means for restricting the movement of the chain is attached to at least one of the pair of endless chains, and at least one dust collecting electrode plate at the lowest position is removed from the chain.
b. The pair of endless chains are separated at the lowest position.
c. One end of a new replacement chain is connected to the lower ends of the pair of separated upstream chains.
d. The pair of ascending chains are pulled up together with the new chain by operating the movement restraining means and pulling down the descending chain by at least one of the dust collecting electrode plates.
e. The dust collecting electrode plate is removed from the lower end side of the lowered descending chain, and the already removed dust collecting electrode plate is attached from one end side of the raised new chain.
f. By repeating the operations d and e, the end of the endless chain and the end of the new chain are separated from each other when the one end of the new chain makes a round through the upper drive wheel.
g. Next, the other end of the new chain is connected to one end of the new chain, thereby making this new chain a new endless chain.

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