JP2015058373A - Dust collecting electrode of mobile electrode-type electric dust collector and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collecting electrode of a mobile electrode-type electric dust collector having a dust collecting plate which is prevented from generating deflection due to inversion while passing between upper and lower sprocket wheels even though the dust collecting plate is constituted of thin steel plates and a method for producing the same.SOLUTION: A planar steel plate 11 or a corrugated steel plate 17, that is formed in a substantially rectangular shape longer in a horizontal direction and causes elastic deformation to a bend along the circumference of upper and lower sprocket wheels when passing between the sprocket wheels, is set as a dust collecting plate 10, which is connected to a vertical end portion pipe frame 12A along upper and lower ends of the dust collecting plate 10, fixed to endless chains 14 arranged on left and right ends of the dust collecting plate 10 via a fitting tool 16 and fixed to the endless chains 14 in an approximately intermediate part of the left and right ends of the dust collecting plate 10 via the fitting tool 16 and an intermediate part pipe frame 12B.

Description

  The present invention relates to a dust collecting electrode of a moving electrode type electrostatic precipitator, and in particular, a moving electrode type electric collector configured such that a plurality of dust collecting plates connected to an endless chain move around a discharge electrode. The present invention relates to a dust collecting electrode of a dust device and a manufacturing method thereof.

  As shown in FIGS. 6 and 7, the moving electrode type electrostatic precipitator 1 is applied between both electrodes while the dust collecting plate 10 constituting the dust collecting electrode 15 moves in the vertical direction and circulates the discharge electrode 5. In this structure, the dust is charged by a high voltage to collect the dust on the dust collecting plate 10, and the dust is removed by the brush 6 installed under the dust collecting electrode 15. Compared with a hitting method performed in a general fixed electrode type electrostatic precipitator, there is less dust separation failure and re-scattering of dust to the downstream, and high dust collection performance can be exhibited. However, a simpler and less expensive structure is required because the dust collecting plate 10 is provided with a driving device for moving the dust collecting plate 10 and the dust collecting plate 10 needs a robust structure for the following reasons.

  The dust collecting electrode 15 is a plurality of dust collecting plates 10 that are horizontally long, arranged in a vertical direction, and suspended by two endless chains 14 installed at both ends (left and right ends) of the dust collecting plate 15 to move around in a caterpillar shape. Sprocket wheels 3, 18, 4, and 20 are arranged on the upper and lower ends of the structure, and the dust collecting plate 10 is reversed along the circumference of the sprocket wheel. During this reversal, the dust collecting plate 10 is in a horizontal posture, and is bent and deformed due to the weight of the dust collecting plate 10 and the attached dust.

  Therefore, in patent document 1, what reinforced the frame shape with the hollow box cross section or the hollow strength member is employ | adopted so that the dust collecting plate 10 may not raise | generate plastic deformation and buckling. However, such a configuration has a problem in that it takes time to manufacture and increases the cost of the apparatus and also increases the weight of the dust collecting plate. In order to manufacture the dust collecting plate 10 at a lower cost, for example, it is conceivable to reduce the thickness of the steel plate. However, if the steel plate is thinned, the welded portion with the frame is bent due to heat input to create a gap, from which dust is generated. May intrude and cause deformation and weight increase of the dust collecting plate. The increase in the weight of the dust collecting plate 10 leads to an increase in driving power of the dust collecting electrode 15 and an increase in wear of sliding parts such as the sprocket wheels 3, 18, 4, 20 and the endless chain 14. The deformation induces the occurrence of sparks due to the variation in the separation distance between the discharge electrode 5 and the dust collecting electrode 15 and causes the dust collecting performance to deteriorate.

  Patent Document 2 and Patent Document 3 disclose a method of rotating the dust collecting plate while maintaining the vertical posture of the dust collecting plate in order to avoid the reversing operation of the dust collecting plate as described above. ing. This is one that is suspended around an endless chain by a pin or shaft at the upper left and right ends of the dust collecting plate 10 or at a position higher than the center of gravity. The left and right sprocket wheels are cantilevered, the upper shaft connecting both sprocket wheels is eliminated, a new rotating shaft is provided above both sprocket wheels, and a mechanism for transmitting rotation to each sprocket wheel is added. . For this reason, there is a problem in that an upper space for accommodating the rotation transmission mechanism is required, and the number of components increases, resulting in an increase in apparatus cost.

JP-A-10-230187 JP-A-55-73359 JP 2007-117982

  Unlike both the hollow box structure of Patent Document 1 and the suspended structure of Patent Documents 2 and 3, even if the dust collecting plate is made of a thin steel plate, it does not bend due to reversal when passing through the upper and lower sprocket wheels. Provided is a dust collecting electrode of a moving electrode type electrostatic dust collecting device having a dust collecting plate. In addition, a method for producing the dust collecting electrode is provided.

  In order to solve the above-mentioned problems, the dust collecting electrode of the moving electrode type electrostatic precipitator according to the present invention has a substantially rectangular shape elongated in the horizontal direction, and the circle of the sprocket wheel when passing through the upper and lower sprocket wheels. A flat steel plate that undergoes elastic deformation in response to bending along the circumference is used as a dust collector, and the upper and lower end pipe frames are joined along the sides of the upper and lower ends of the dust collector, and the upper and lower end pipe frames are attached. It is fixed to an endless chain disposed at the left and right ends of the dust collecting plate via a jig, and is attached to the endless chain via the mounting jig and an intermediate pipe frame at substantially the middle portion of the left and right ends of the dust collecting plate. It is fixed.

  As a result, the dust collecting plate made of a flat steel plate rotates in a semi-cylindrical shape while deforming along the circumference of the upper and lower sprocket wheels, so that it is against the vertical force (gravity) of the dust collecting plate. Rigidity is ensured and vertical deflection can be prevented.

  The dust collecting electrode of the moving electrode type electrostatic precipitator according to the present invention is characterized in that the dust collecting plate, the upper and lower end pipe frames and the intermediate pipe frame are joined by rivets.

  As a result, even if a thin flat steel plate having a thickness of 0.2 to 0.8 mm is used as the dust collecting plate, there is no problem of bending due to the heat of welding, and bonding can be performed in a short time.

  Further, the dust collecting electrode of the moving electrode type electrostatic precipitator according to the present invention has a substantially rectangular shape that is long in the horizontal direction and the longitudinal direction of the concavo-convex portion coincides with the horizontal direction as the dust collecting plate. It is characterized by using corrugated steel plates that cause elastic deformation against bending when passing through the upper and lower sprocket wheels. This further increases the rigidity against vertical force (gravity) when reversing while forming a semi-cylindrical shape while deforming along the circumference of the upper and lower sprocket wheels, and more effectively preventing vertical deflection Can be done.

Further, when the corrugated steel plate is used as the dust collecting plate, the dust collecting electrode of the moving electrode type electrostatic precipitator according to the present invention has a dust scraping brush for the dust collecting electrode in the moving direction of the dust collecting plate. On the other hand, it has a hair having a different length.
Thereby, since the bristle of a brush contacts along the unevenness | corrugation of a corrugated steel plate, the adhering dust can be scraped off uniformly.

Also, the method of manufacturing the dust collecting electrode of the moving electrode type electrostatic precipitator according to the present invention includes the upper and lower end pipe frames in which a plurality of rivet holes are provided in an endless chain stretched on the left and right of the dust collecting plate. Is installed horizontally through the mounting jig, and a plurality of rivet holes are provided in the upper and lower end portions of the dust collecting plate and in the substantially middle portion of the left and right sides, and the intermediate portion is disposed in the middle portion of the dust collecting plate. The attachment jig to which the part pipe frame is joined is attached by rivets, and the upper and lower end parts of the dust collecting plate and the upper and lower end part pipe frames are fixed by rivets.
As a result, the thin steel plate (flat steel plate) or corrugated steel plate, which is a member of the dust collecting plate, has been stacked without any other members being attached until the stage of attachment to the endless chain after providing the rivet hole. Therefore, it can be transported and stored in a compact manner, and deformation of the dust collecting plate can be prevented.

According to the dust collecting electrode of the moving electrode type electrostatic precipitator having the above-described characteristics, it is possible to configure a dust collecting plate that does not bend even if it is a thin flat steel plate or a corrugated steel plate. This makes it possible to produce a lightweight and low-cost dust collecting electrode.
Further, according to the method of manufacturing the dust collecting electrode as described above, it can be manufactured at low cost while ensuring reliability.

The bird's-eye view of the dust collection electrode of this invention. The schematic diagram which shows the manufacturing process of the dust collection electrode of this invention. The bird's-eye view of the dust collection pole which is a modification of this invention. The schematic diagram which shows the manufacturing process of the dust collection electrode which is a modification of this invention. The side view which shows the brush structure of the dust collection electrode which is a modification of this invention. The conceptual diagram which shows the internal structure of a moving electrode type electrostatic precipitator. The conceptual diagram which shows the detail of the internal structure of a moving electrode type electrostatic precipitator.

  FIG. 1 is a bird's-eye view of the dust collection electrode 15 of the present invention. The dust collecting electrode 15 uses a substantially rectangular flat steel plate 11 that is long in the horizontal direction (flow direction of exhaust gas) as the base of the dust collecting plate 10. The material is a thin steel plate having a thickness of 0.2 to 0.8 mm, and elastically deforms against bending along the circumference of the sprocket wheel when passing through the upper and lower sprocket wheels 3, 18, 4, and 20. Although the length of the dust collecting plate 10 in the vertical direction is arbitrary, the dust scraped off by the brush 6 (FIG. 7) falls from the gap between adjacent dust collecting plates 10 and accumulates in the hopper 51 (FIG. 6). Therefore, it is necessary to consider a certain proportion of gaps, workability when replacing the dust collecting plate 10 due to damage of the dust collecting plate 10 due to deterioration over time, and good handling at the production stage. It is set to about several tens of centimeters to 1 meter. Endlessly joined to the upper and lower end pipe frames 12A along the sides of the upper and lower end portions of the dust collecting plate 10 and disposed on the left and right ends of the dust collecting plate 10 via the mounting jig 16. While fixing to the chain 14, it fixes to the said endless chain 14 via the said attachment jig 16 and the intermediate part pipe frame 12B in the substantially intermediate part of the right-and-left both ends of this dust collecting plate 10. FIG. The intermediate pipe frame 12 </ b> B used in the substantially intermediate portion may be long enough to connect the left and right end portions of the dust collecting plate 10 to the endless chain 14.

  The upper and lower end pipe frames 12A and the intermediate pipe frame 12B are preferably columnar with a square cross section. With this configuration, the dust collecting plate 10 can be prevented from shaking due to the exhaust gas flow by the upper and lower end pipe frames 12A and the intermediate pipe frame 12B when moving in the vertical direction, and the upper and lower sprocket wheels 3, 18, 4, When passing through 20, the posture of the dust collecting plate 10 is maintained along the circumference of the sprocket wheel, so that it can stably form a semi-cylindrical shape, and against vertical force (gravity). And high rigidity can be secured.

  FIG. 2 is a schematic view showing a manufacturing process of the dust collecting electrode of the present invention. The attachment jig 16 is welded to the endless chain 14 at intervals of the width of the dust collecting plate 10, and the upper and lower end pipe frames 12 </ b> A are passed between the opposing attachment jigs 16 and welded. A plurality of rivet holes 24 are formed in the upper and lower end pipe frames 12A at predetermined intervals in advance (FIG. 2A).

  Next, an attachment jig 16 in which an intermediate pipe frame 12B is welded to a substantially intermediate portion of the dust collecting plate 10 in which rivet holes 24 are formed in substantially intermediate portions between the upper and lower end portions and the left and right end portions of the flat steel plate 11 in advance. Fix with a rivet 13 (not shown) (FIG. 2B). The rivet 13 is preferably a blind rivet that can be joined from one side. Thereafter, the positions of the flat steel plate 11 and the upper and lower end pipe frames 12A are aligned and fixed with the rivets 13 (FIG. 2C).

The above process is performed over the entire circumference of the endless chain 14. In addition, the dust scraped off by the brush 6 (FIG. 7) as described above can fall to the lower hopper by providing a gap between the adjacent dust collecting plates 10.
Through the above manufacturing process, the thin steel plate (flat steel plate) or the corrugated steel plate described later, which is a member of the dust collecting plate 10, is transported in a stacked state until it is attached to the endless chain after providing the rivet hole. Storage is possible, and since the member that generates irregularities is not installed on the dust collecting plate, the dust collecting plate can be prevented from being deformed and made compact.

  FIG. 3 is a bird's-eye view of a dust collecting electrode which is a modification of the present invention. The dust collecting electrode 15 uses, as a base of the dust collecting plate 10, a corrugated steel plate 11 that is long in the horizontal direction (exhaust gas flow direction) and whose longitudinal direction of the corrugated uneven portion coincides with the horizontal direction. . The material is a thin corrugated sheet steel having a thickness of 0.2 to 0.8 mm, and is elastic to bending along the circumference of the sprocket wheel when passing through the upper and lower sprocket wheels 3, 18, 4, 20. The deformation is the same as that of the flat steel plate 11, but since there is a corrugated uneven portion, it is possible to obtain higher rigidity against vertical force (gravity). Although the length of the dust collecting plate 10 in the vertical direction is arbitrary, the dust scraped off by the brush 6 (FIG. 7) falls from the gap between adjacent dust collecting plates 10 and accumulates in the hopper 51 (FIG. 6). Therefore, it is necessary to consider a certain proportion of gaps, workability when replacing the dust collecting plate 10 due to damage of the dust collecting plate 10 due to deterioration over time, and good handling at the production stage. The thickness is set to about several tens of centimeters to 1 meter as in the case of the flat steel plate 11.

  FIG. 4 is a schematic view showing a manufacturing process of a dust collecting electrode which is a modified example of the present invention. A mounting jig 16 is welded to the endless chain 14 at intervals of the width of the dust collecting plate 10, and a cylindrical upper and lower end pipe frame 12 </ b> A having substantially the same curvature as the corrugated portion of the corrugated steel sheet 17 is opposed to the endless chain 14. Weld between tools 16 and weld. A plurality of rivet holes 24 are formed in the cylindrical upper and lower end pipe frames 12A at predetermined intervals in advance (FIG. 4A).

  Next, the attachment jig 16 in which the intermediate pipe frame 12B is welded to the substantially intermediate portion of the dust collecting plate 10 in which the rivet holes 24 are formed in the intermediate portions between the upper and lower ends and the left and right ends of the corrugated steel plate 17 in advance. Is fixed with a rivet 13 (not shown) (FIG. 4B). The intermediate pipe frame 12 </ b> B used in the substantially intermediate portion may be long enough to connect the left and right end portions of the dust collecting plate 10 to the endless chain 14. Thereafter, the corrugated steel plate 17 and the upper and lower end pipe frames 12A are aligned and fixed with the rivets 13 (FIG. 4C).

The above process is performed over the entire circumference of the endless chain 14. By providing a gap between adjacent dust collecting plates 10, the dust scraped off by the brush 6 (FIG. 7) as described above can fall to the lower hopper.
FIG. 5 is a side view showing a brush structure of a dust collecting electrode, which is a modification of the present invention. Dust adheres due to electrostatic dust collection along the corrugated shape of the corrugated steel sheet 17, but with the brush (a) having a uniform hair length, the hair does not reach the back of the recess and the dust is not sufficiently scraped off. It becomes. On the other hand, in the brush (b) in which the bristle length differs in the moving direction (upward) of the dust collecting plate of the corrugated steel plate 17, the short bristle reaches the back of the concave portion, so that dust can be scraped evenly. Accordingly, stable charging can be performed and high dust collection performance can be maintained.

1 ......... Moving electrode type electrostatic precipitator, 3 ......... Upper sprocket wheel, 4 ......... Lower sprocket wheel, 5 ......... Discharge electrode, 6 ......... Brush, 7, 8, 9 ......... Earth DESCRIPTION OF SYMBOLS 10 ......... Dust collecting plate, 11 ......... Plate steel plate, 12A ......... Upper / lower end pipe frame, 12B ......... Intermediate pipe frame, 13 ......... Rivets, 14 ......... Endless chain, 15 ... ...... Dust collecting electrode, 16 ......... Jig, 17 ......... Corrugated steel plate, 18 ......... Upper sprocket wheel, 20 ......... Lower sprocket wheel, 22 ......... Upper shaft, 23 ......... Lower Shaft, 24 ......... Rivet hole, 50 ......... Case, 51 ......... Hopper, 52 ......... Inlet flue, 53 ......... Exit flue, 54 ......... Exhaust gas, 55 ......... Dust exhaust Exit, 56 ......... Insulator, 57 ......... Discharge electrode Port.

Claims (5)

A dust collecting electrode of a moving electrode type electrostatic precipitator configured such that a plurality of dust collecting plates connected to an endless chain move around the discharge electrode has a substantially rectangular shape elongated in the horizontal direction. A flat steel plate that causes elastic deformation against bending along the circumference of the sprocket wheel when passing through the upper and lower sprocket wheels is the dust collecting plate, and upper and lower ends along the sides of the upper and lower ends of the dust collecting plate. The upper and lower end pipe frames are fixed to the endless chains disposed at the left and right ends of the dust collecting plate via attachment jigs, and at substantially intermediate portions at the left and right ends of the dust collecting plate. A dust collecting electrode of a moving electrode type electrostatic dust collecting device, wherein the dust collecting plate is fixed to the endless chain via the mounting jig and an intermediate pipe frame. The dust collecting electrode of the moving electrode type electrostatic precipitator according to claim 1, wherein the upper and lower end pipe frames and the intermediate pipe frame are joined to the dust collecting plate by rivets. As the dust collecting plate, a corrugated plate that is long in the horizontal direction and has a substantially rectangular shape in which the longitudinal direction of the concavo-convex portion coincides with the horizontal direction, and elastically deforms with respect to bending when passing through the upper and lower sprocket wheels. 3. A dust collecting electrode for a moving electrode type electrostatic precipitator according to claim 1, wherein a steel plate is used. The dust collecting electrode of the moving electrode type electrostatic precipitator according to claim 3, wherein the dust scraping brush of the dust collecting electrode has bristles having different lengths with respect to the moving direction of the dust collecting plate. . A method of manufacturing a dust collecting electrode of a moving electrode type electrostatic precipitator configured such that a plurality of dust collecting plates connected to an endless chain move around a discharge electrode, the right and left sides of the dust collecting plate being After installing the upper and lower end pipe frame provided with a plurality of rivet holes in the horizontal direction with the vertical width of the dust collecting plate as an interval in the endless chain stretched to the endless chain via the mounting jig, Attach the attachment jig that joined the intermediate pipe frame to the substantially right and left intermediate parts of the dust collecting plate provided with a plurality of rivet holes in the middle part of the upper and lower ends and the left and right sides in advance, and then A method of manufacturing a dust collecting electrode of a moving electrode type electrostatic dust collecting device, wherein the dust collecting plate and the upper and lower end pipe frames are fixed by rivets.

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