JP2001246284A - Moving electrode type electric dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drive remaining normal moving electrodes without stopping a common driving mechanism even when a part of moving electrodes cannot be driven. SOLUTION: This moving electrode type electric dust collector is provided with a number of moving electrodes 15 so set as to wind every other discharge frames suspended in a casing and driving a plurality of adjoining moving electrodes 15 with a common driving source 58, and chain drive sprockets 42 provided with optional moving electrodes 15 set on their driving shafts 34 are run idle to separate the optional moving electrodes from the driving with the common driving source 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable electrode type dust collector, and more particularly, to a plurality of discharge frames suspended at a predetermined interval in a casing, and the discharge frames are circulated every other one. The present invention relates to a moving electrode type electrostatic precipitator provided with a large number of moving electrodes.

[0002]

2. Description of the Related Art A moving electrode type dust collector of this type is known as a dust collector for removing dust in boiler exhaust gas from a thermal power plant and exhaust gas from various furnaces for steelmaking. The schematic structure will be described with reference to FIGS.

[0003] In FIG. 6, a moving electrode type electrostatic precipitator 1 is shown.
Reference numeral 0 denotes a casing 12, a hopper 13 below the casing 12, and 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 exhaust gas is removed by the principle of electric dust collection and discharged from an outlet flue 18. The collected dust falls into the hopper 13 and is discharged from the discharge port 2 by a mechanism (not shown).
Take from 0.

FIG. 7 is a view taken in the direction of arrows AA in FIG. 6, in which a large number of discharge frames 14 are suspended at predetermined intervals in a casing 12 from a insulator 22 shown in FIG. Is suspended through. In addition, a large number of moving electrodes 15 are provided so as to circulate every other discharge frame 14.

FIG. 8 is a perspective view showing the structure of the moving electrode 15. A pair of endless chains 30, 30 are stretched between an upper driving wheel 26 and a lower roller 28. A plurality of dust collecting electrode plates 32 are suspended from the chains 30, 30 by 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 26 is rotated by a drive mechanism (not shown), and the rotation of the shaft 34 is transmitted to the pair of endless chains 30, 30 meshing with the drive wheel 26 to form a plurality of dust collecting plates forming the loop. 32 moves around every other discharge frame 14.

FIG. 9 is a layout view of the lower part of the movable electrode 15,
The dust collecting electrode plate 32 suspended by the endless chain 30 and descending makes a U-turn at the position of the lower roller 28, and starts ascending.
A pair of rotating brushes 36 and 38 (hereinafter, this pair of rotating brushes is collectively referred to as a brush means and is denoted by reference numeral 40) is located at a position sandwiching the dust collecting electrode plate 32 immediately after the rising.
5 for each lane. The brushes 36 and 38 are made by implanting metal brushes on the rotating shafts. The brush 36 is turned clockwise and the brush 38 is turned counterclockwise so as to blow down dust adhering to the surface of the dust collecting electrode plate 32 downward. Rotate around. The dust collecting electrode plate 32 from which dust adhered to the surface has been removed by the brush means 40 rises sequentially, and the discharge frame 14
The dust in the exhaust gas is collected on the surface by the principle of electric dust collection in the discharge region from the surface and descends again.

[0007]

In the case where the moving electrode 15 is a relatively large-scale device, the moving electrode 15
Are 50 to 100 lanes, and these moving electrodes 1
5, the same number of driving devices are required, and there is a problem that the installation cost of these driving mechanisms becomes large.

In order to solve the above-mentioned problem, it is conceivable that a plurality of adjacent moving electrodes can be driven by a common driving mechanism, thereby reducing the installation cost of the driving mechanism. However, in this type of moving electrode type electrostatic precipitator, since the moving electrode is driven under severe conditions for handling dust, the sliding parts in various places are severely worn by the attached dust. In addition, there are many opportunities for various members to be corroded or worn by corrosion due to corrosive exhaust gas or spark discharge based on high-voltage charging. For this reason, when one moving electrode cannot be driven due to abrasion due to dust or the like, the entire driving mechanism must be stopped, and there is a problem that the driving of the remaining normal moving electrode is sacrificed.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to stop a common drive mechanism even when some of the adjacent moving electrodes cannot be driven. It is an object of the present invention to provide a movable electrode type electrostatic precipitator which can continuously drive the remaining normal movable electrodes without causing any problem.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plurality of discharge frames suspended at predetermined intervals in a casing and a plurality of discharge frames suspended on a pair of endless chains. Forming a loop as a whole by the dust collecting electrode plate, the dust collecting electrode plate includes a plurality of moving electrodes that circulate every other discharge frame, and drives a plurality of adjacent moving electrodes by a common driving mechanism. A moving electrode type electrostatic precipitator is characterized in that any moving electrode can be separated from driving by the common driving mechanism.

Further, in the present invention, the driving mechanism transmits a driving force to an adjacent moving electrode by chain transmission. When an arbitrary moving electrode is separated from the driving by the common driving mechanism, a driving shaft of the moving electrode is used. Wherein the chain transmission sprocket provided in the vehicle is idled.

Further, the present invention is characterized in that dust collecting electrode plates of a plurality of adjacent moving electrodes driven by the common driving mechanism move with a phase difference from each other.

[0013]

FIG. 1 is a perspective view showing a moving electrode driving mechanism according to an embodiment of the present invention. The overall configuration of the movable electrode type electrostatic precipitator is the same as that described in the section of the related art, and the components denoted by the same reference numerals as above denote the same components.

In FIG. 1, moving electrodes 15A, 15B, 1
5C and 15D are in parallel. In each moving electrode, the dust collecting electrode plate (not shown) is suspended by the endless chain 30 and makes a U-turn at the positions of the drive wheels 26A, 26B, 26C, 26D, and changes from rising to falling. The drive shafts 34A, 34B, 34C, 34D of the respective drive wheels are supported at positions of a casing (not shown), one end protrudes outside the casing, and drive sprockets 42A, 42B, 42C, 42D are respectively provided at the ends. Is provided.

The driving sprocket 42 is shown in FIG.
As shown in FIG. 7, the inner sprocket wheel 44 and the outer sprocket wheel 46 are integrally formed, and a collar 48 and a holding flange 50 are provided at the end of the drive shaft 34.
It is arranged in between. Usually, the outer sprocket wheel 46 and the holding flange 50 are used by being tightened by holding bolts 52. The holding flange 50 is integrated with the drive shaft 34 by a key 54. For this reason,
The sprocket 42 and the drive shaft 34 rotate integrally via a holding flange 50. On the other hand, when the holding bolt 52 is removed to separate the outer sprocket wheel 46 from the holding flange 50, the sprocket 42 is caused to idle with respect to the drive shaft 34 via the oilless metal 56.

A common drive source 58 is disposed outside the casing, and the rotational force generated by the drive source 58
And the chain 62 and the sprockets 42B and 42C
To be transmitted. As a result, the drive shafts 34B and 34C integral with the sprockets 42B and 42C respectively rotate, and the moving electrodes 15B and 15C are driven. Further, the rotation of the sprocket 42B is
A and the drive shaft 34A integrated with the sprocket 42A
Is rotated to drive the moving electrode 15A.
Similarly, the rotation of the sprocket 42A is transmitted to a sprocket of an adjacent moving electrode (not shown) via the chain 66, and the adjacent moving electrode is driven. The moving electrode 15D and the moving electrode (not shown) adjacent to the moving electrode 15D are driven by the same chain transmission as described above.

As a result, a plurality of adjacent moving electrodes 15 can be driven by the common driving source 58. In the present embodiment, the driving source 58 is arranged at the center, and the moving electrodes 15 of a total of six lanes, three lanes on each side, are driven by the common driving source 58. By applying the same structure to other moving electrodes, in a moving electrode type electrostatic precipitator having 60 moving electrodes, all the moving electrodes can be driven by 10 driving sources, This greatly contributes to simplification of the driving device.

On the other hand, when a plurality of adjacent moving electrodes are driven by a common driving source, if one moving electrode cannot be driven, a situation arises in which the entire driving mechanism must be stopped. In the present embodiment, when an arbitrary moving electrode out of a plurality of moving electrodes cannot be driven, it can be dealt with by separating the moving electrode from driving by a common driving mechanism. That is, the driving shaft 3 of the moving electrode 15
4, the chain transmission sprocket 42 is caused to idle. Specifically, as shown in FIG. 2, the holding bolt 52 for fastening the sprocket 42 and the holding flange 50 is removed. By removing the holding bolt 52, the sprocket 42 and the holding flange 50 are separated, and the drive shaft 34 does not rotate even if the sprocket 42 rotates. Therefore, while rotating all of the plurality of sprockets 42 provided in the common drive mechanism, it is possible to separate the rotation shaft 34 of any unmovable moving electrode from the common drive mechanism.

Therefore, if one of the moving electrodes becomes inoperable due to an unexpected situation, the other normal moving electrode can be continuously driven by disconnecting the moving electrode from the common driving mechanism as described above. . For this reason, for example, when operating the movable electrode type electrostatic precipitator for exhaust gas treatment of a thermal power plant, even if one lane of the 60 lane movable electrodes becomes inoperable, the movable electrode type electrostatic precipitator is not used. It is possible to avoid a situation in which the entire power plant, and thus the entire thermal power plant is stopped. The inoperable moving electrode may be restored at a regular or temporary repair opportunity of the thermal power plant.

In this embodiment, in addition to the above features, the dust collecting electrode plates of the plurality of adjacent moving electrodes are driven with a phase difference from the dust collecting electrode plates of the other moving electrodes. That is, in FIG. 3, when the phase of the dust collecting electrode plate 32A of the moving electrode 15A is set as a reference, the dust collecting electrode plate 32B of the moving electrode 15B becomes 30 °.
The dust collecting electrode plate 32C of the movable electrode 15C is driven with a delay of 60 ° with a phase difference of 60 °.
Hereinafter, similarly, the dust collecting electrode plates 32 of the moving electrodes 15 of 6 lanes driven by the common driving source 62 are 0 °, 30 °, 6 °.
It is driven with a phase difference every 30 ° in the order of 0 °, 90 °, 120 °, 150 °.

The reason for providing a phase difference in driving the dust collecting electrode plate 32 as described above is closely related to the outer shape of the dust collecting electrode plate 32. That is, as shown in FIG. 4, the dust collecting electrode plate 32 has a structure in which the periphery of a thin steel plate 72 is reinforced by a relatively thick vertical frame 74 and a horizontal frame 76 mainly for the purpose of weight reduction and strength. It is said.

For this reason, when the dust collecting electrode plate 32 passes between a pair of brushes 36 and 38 arranged at a fixed position as shown in FIG. Of the brush 78 is relatively small and the pressing force of the brush against the steel plate 72 is small, so that the passage resistance when the steel plate 72 passes through the brush means 40 is small. on the other hand,
In the portion of the horizontal frame 76 shown in (b), the deformation of the brush 78 of the brush is large, and the pressing force of the brush against the horizontal frame 76 is large, so that the passage resistance when the horizontal frame 76 passes through the brush means 40 is large. Become. In one calculation example, the passage resistance when the horizontal frame 76 passes through the brush means 40 is about three times that of the steel plate 72.

Therefore, the plurality of movable electrodes 15 are connected to the common driving source 58 in a state where the dust collecting electrode plates 32 of the plurality of adjacent movable electrodes 15 have no phase difference with each other as shown in FIG.
When driven by the
6 pass through the brush means 40 at the same time,
At this time, the load on the common drive source and the transmission mechanism increases. For this reason, a common drive source and a transmission mechanism must be provided so as to withstand a temporary large load, which leads to an increase in equipment cost.

On the other hand, in the present embodiment, as shown in FIG. 3, the dust collecting electrode plates 32 of a plurality of adjacent movable electrodes 15 have a phase difference with each other. Therefore, the plurality of moving electrodes 15
Are driven by a common driving source, the horizontal frames 76 of the plurality of dust collecting electrode plates 32 are less likely to pass through the brush means 40 at the same time, and the loads on the common driving source and the transmission mechanism are averaged. For this reason, the capacity and strength of the common drive source and the transmission mechanism can be reduced, and equipment costs can be reduced.

[0025]

According to the moving electrode type electrostatic precipitator according to the present invention, when a part of moving electrodes out of a plurality of adjacent moving electrodes driven by a common driving mechanism cannot be driven, Without stopping the common drive mechanism,
The remaining normal moving electrodes can be continuously driven.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a driving mechanism of a moving electrode according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an end structure of a driving shaft of the moving electrode according to the embodiment of the present invention.

FIG. 3 is a layout diagram of a lower portion of the moving electrode according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a structure of a dust collecting electrode according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an operation state of the brush means according to the embodiment of the present invention.

FIG. 6 is a side sectional view showing a general configuration of a moving electrode type electrostatic precipitator.

FIG. 7 is a view taken in the direction of arrows AA in FIG. 6;

FIG. 8 is a perspective view showing a general structure of a moving electrode.

FIG. 9 is a layout diagram of a general lower portion of a moving electrode.

[Explanation of symbols]

 12 Casing 14 Discharge frame 15 Moving electrode 26 Drive wheel 30 Endless chain 32 Dust collecting electrode plate 34 Drive shaft 42 Sprocket 52 Holding bolt 58 Drive source

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B03C 3/74 B03C 3/74 A

Claims (3)

[Claims] 1. A loop as a whole is formed by a large number of discharge frames suspended at predetermined intervals in a casing and a plurality of dust collecting electrode plates suspended from a pair of endless chains. In a moving electrode type electrostatic precipitator in which an electrode plate includes a plurality of moving electrodes that circulate every other discharge frame, and drives a plurality of adjacent moving electrodes by a common driving mechanism, an arbitrary moving electrode is shared by the common electrode. A movable electrode type electrostatic precipitator, which can be separated from driving by the driving mechanism of (1). 2. The driving mechanism transmits a driving force to an adjacent moving electrode by a chain transmission. When an arbitrary moving electrode is separated from driving by the common driving mechanism, the driving mechanism is provided on a driving shaft of the moving electrode. 2. The movable electrode type electrostatic precipitator according to claim 1, wherein the chain transmission sprocket is made to idle. 3. The moving-electrode type dust collector according to claim 1, wherein the dust-collecting electrode plates of the plurality of adjacent moving electrodes move with a phase difference therebetween.