JP2005185911A - Electrode dust collector electrode structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode structure of an electric dust collector with high dust collection efficiency, which does not cause an increase in pressure loss of a dust collecting portion even when a processing wind speed is increased, and can prevent a polar plate from bending due to a static pressure difference. To do.
An electric dust collector equipped with an electrode 11 for collecting charged dust particles, wherein at least one of a high-voltage side electrode and a ground-side electrode of the electrode 11 serves as a through portion 13 penetrating the front and back. By providing the slits 14, the static pressure difference between the front and back sides is reduced.
As a result, the electrode plate can be prevented from bending due to a static pressure difference without increasing the pressure loss of the dust collection portion even if the processing wind speed is increased, and the spatial distance between adjacent electrode plates is kept constant, and a spark is generated. By reducing the frequency of airborne particles, it is possible to prevent scattering of suspended particulate matter and maintain high dust collection efficiency.
[Selection] Figure 1

Description

  The present invention relates to an electrode structure of an electrostatic precipitator, and the electrode plate is formed by an air flow without causing an increase in pressure loss at an electrode of a dust collector of a two-stage electrostatic precipitator or an electrode of a single-stage electrostatic precipitator. The present invention relates to an electrode structure that can prevent bending due to a static pressure difference.

  In road tunnels, dust containing SPM (suspended particulate matter) discharged from a traveling vehicle interferes with the visibility in the tunnel, and adversely affects the human body in the traveling vehicle and equipment installed in the tunnel. Such dust is exhausted to the atmosphere by a fan installed in the ventilation tower, but it can be exhausted from the ventilation tower and become a source of environmental pollution around the ventilation tower. Electric dust collectors are often installed inside or in the middle of ventilation towers.

  Such types of electrostatic precipitators include a one-stage electric precipitator that integrates a charging unit and a precipitator, and a two-stage electric precipitator that includes a charging unit and a precipitator. For example, Patent Document 1 discloses a two-stage electric dust collector.

  As shown in FIG. 3, the two-stage electrostatic precipitator 1 includes a housing 2 serving as a gas flow path, and a charging unit 4 is provided on the inlet side 3 of the housing 2, and the outlet side 5 is provided on the outlet side 5. A dust collection portion 6 is provided.

  The charging unit 4 of the electrostatic precipitator 1 has a plurality of (two in the figure) discharge wires 4a extending in the front-rear direction, and a plate-like counter electrode 4b sandwiched between the discharge wires 4a in the gas flow direction G. And a plurality of sets (three sets in the figure) provided in parallel with each other, and a DC high voltage 7 is applied between the discharge line 4a and the counter electrode 4b to generate a corona discharge, and in the passing gas The particulate matter is charged.

The dust collector 6 of the electrostatic precipitator 1 includes a plurality of pairs of flat high-voltage side electrodes 6a and flat ground side electrodes 6b arranged in parallel with the gas flow direction G. A DC high voltage 8 is applied between the high voltage side electrode 6a and the ground side electrode 6b, and the particulate matter charged by the upstream charging unit 4 is attracted by Coulomb force (static electricity). To collect.
Japanese Patent Application Laid-Open No. 5-237382

  In such a road tunnel where the electrostatic precipitator 1 is installed, it is often necessary to increase the processing air volume in the electrostatic precipitator according to the traffic volume. For this reason, the ventilation duct is increased or the processing air speed is increased. However, the wind speed is often increased due to restrictions on the site area of the ventilator.

  However, in the dust collection portion 6 in which the high voltage side electrode 6a and the ground side electrode 6b using a stainless steel plate having a thickness of 0.5 mm or less are aligned at intervals of about 10 mm or less, as the processing wind speed increases. A static pressure difference is generated by the aerodynamic unbalance on both sides of each of the electrode plates 6a and 6b, and the difference in pressure causes bending of the electrode plates 6a and 6b, resulting in a portion where the distance between the electrode plates 6a and 6b is narrowed.

  If this bending of the electrode plate occurs, for example, in the high-voltage side electrode 6a, the spatial distance between the adjacent ground-side electrode 6b becomes close and sparks tend to occur frequently, and the electrode plate vibrates due to the impact force of the spark. There is a problem that the suspended particulate matter adhering to the electrode plate surface is scattered in the air and the dust collection efficiency is lowered.

  Therefore, in order to prevent the bending of the electrode plates, it is conceivable to increase the number of support members composed of tie rods and spacers that connect the electrode plates, but the dust collection area is reduced accordingly, and the pressure loss is reduced. While increasing, there exists a problem of causing the increase in the number of parts and the weight.

  This invention was made in view of the problems of the prior art, without increasing the pressure loss of the dust collection part even if the processing wind speed is increased, it can also prevent the electrode plate from bending due to the static pressure difference, An object of the present invention is to provide an electrode structure of an electric dust collector with high dust collection efficiency.

  In order to solve the above problems, the electrode structure of the electrostatic precipitator according to claim 1 of the present invention is an electrostatic precipitator including an electrode that collects charged dust particles, and the high voltage of the electrode At least one of the side electrode and the ground side electrode is provided with a penetrating portion penetrating the front and back.

  According to the electrode structure of this electrostatic precipitator, it is an electrostatic precipitator equipped with an electrode that collects charged dust particles, and at least one of the high voltage side electrode and the ground side electrode of the electrode penetrates the front and back. Through-holes, and either the high-voltage side electrode and the ground-side electrode of the dust collector part of the two-stage electrostatic precipitator or the electrode of the single-stage electrostatic precipitator, or either one of them By providing a through-hole in the electrode, the static pressure difference between the front and back is reduced.

  As a result, even if the treatment wind speed is increased, the electrode plate bends due to a static pressure difference without increasing the pressure loss of the electrode of the dust collector of the two-stage type electric dust collector or the electrode of the single-stage type electric dust collector. In this case, the spatial distance between the adjacent electrode plates is kept constant, the frequency of occurrence of sparks is reduced, the scattering of the suspended particulate matter is prevented, and high dust collection efficiency is maintained.

  According to a second aspect of the present invention, the electrode structure of the electric dust collector is characterized in that, in addition to the structure of the first aspect, the through portion is formed only in the high voltage side electrode.

  According to the electrode structure of the electrostatic precipitator, the through portion is formed only in the high voltage side electrode, and the ground pressure for collecting dust is reduced by reducing the static pressure difference between the front and back of the high voltage side electrode. The dust collection area of the side electrode is not affected.

  Furthermore, the electrode structure of the electrostatic precipitator according to claim 3 of the present invention is characterized in that, in addition to the structure according to claim 1 or 2, the through portion is constituted by an elongated slit. .

  According to the electrode structure of the electrostatic precipitator, the penetrating portion is constituted by a long hole-shaped slit, and the bending of the electrode plate can be efficiently prevented.

  Moreover, the electrode structure of the electric dust collector of Claim 4 of this invention is the structure in any one of Claims 1-3, and the said electrode is an electrode of a one-stage type electric dust collector, or a two-stage type. It is an electrode of the dust collection part of an electric dust collector.

  According to the electrode structure of the electrostatic precipitator, the electrode is used as an electrode of a single-stage electric precipitator or an electrode of a dust collector of a two-stage precipitator. Whether it is a dust collector electrode or a single-stage electrostatic precipitator electrode, the electrode plate can be prevented from bending due to a static pressure difference without increasing pressure loss even if the processing wind speed is increased. The distance between the electrode plate and the electrode plate is kept constant, the frequency of occurrence of sparks is reduced, and the adhering suspended particulate matter is prevented from scattering to maintain high dust collection efficiency.

  According to the electrode structure of the electrostatic precipitator according to claim 1 of the present invention, in the electrostatic precipitator provided with an electrode for collecting charged dust particles, the high voltage side electrode and the ground side electrode of the electrode Since at least one of the through-holes that penetrates the front and back is provided, the high voltage can be applied to either the dust collector electrode of the two-stage type electric dust collector or the electrode of the single-stage type electric dust collector. By providing the penetrating portion in both the side electrode and the ground side electrode, or in any one of the electrodes, the static pressure difference between the front and back surfaces can be reduced.

  As a result, even if the processing wind speed is increased, the electrode of the dust collector of the two-stage type electric dust collector or the electrode of the single-stage type electric dust collector can be used without increasing the pressure loss. The plate can be prevented from bending due to a difference in static pressure, the spatial distance between adjacent plates is kept constant, the frequency of spark generation is reduced, and scattering of suspended particulate matter is prevented, resulting in high dust collection efficiency. Can keep.

  Further, according to the electrode structure of the electric dust collector according to claim 2 of the present invention, since the through portion is formed only in the high voltage side electrode, the static pressure difference between the front and back of the high voltage side electrode is reduced. By making it small, the static pressure difference between the front and back surfaces can be reduced and the spatial distance between adjacent electrode plates can be kept constant without affecting the dust collection area of the grounding side electrode to be collected.

  Furthermore, according to the electrode structure of the electrostatic precipitator according to claim 3 of the present invention, since the penetrating portion is constituted by a long hole-like slit, it is possible to efficiently prevent the bending of the electrode plate. it can.

  Further, according to the electrode structure of the electric dust collector according to claim 4 of the present invention, the electrode is an electrode of a one-stage electric dust collector or an electrode of a dust collector of a two-stage electric dust collector. Whether the electrode is a dust collector of a two-stage type electric dust collector or the electrode of a single-stage type electric dust collector, the electrode plate can be formed without increasing the pressure loss even if the processing wind speed is increased. It can prevent bending due to the difference in static pressure, maintain a constant spatial distance between adjacent electrode plates, reduce the frequency of spark generation, and prevent scattering of suspended particulate matter and maintain high dust collection efficiency. Can do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view according to an embodiment of an electrode structure of an electric dust collector of the present invention.

  An electrostatic precipitator to which the electrode structure 10 of this electrostatic precipitator is applied is, for example, a two-stage type, similar to the one described with reference to FIG. 3, and a charging portion is provided on the inlet side 3 of the housing 2 serving as a gas passage. 4 is provided, and a dust collecting portion 6 is provided on the outlet side 5 at the rear thereof, and is used as an electrode of the dust collecting portion 6 of this electric dust collector.

  Although not shown, the present invention can also be applied to an electrode of a one-stage type electric dust collector.

  This electrode structure 10 is applied to the electrode 11 of the dust collection portion 6, that is, both the high voltage side electrode and the ground side electrode, or one of them.

  The electrode 11 is formed into a substantially rectangular flat plate shape using a stainless steel plate having a thickness of 0.5 mm or less, for example, 0.4 mm, and as shown in FIG. Tie rod attachment holes 12 are formed in a total of eight locations, and depressions are formed on the outside of each attachment hole 12 so that the shape is divided into approximately three vertically.

  The electrode 11 is formed with a through-hole 13 penetrating the front and back, so that the static pressure difference between the front and back can be eliminated when placed in the gas flow. For example, as shown in FIG. In this way, it is composed of a long hole-like slit 14 that is long in the vertical direction, and is provided at three locations at equal intervals in the vertical direction in the center portion in the width direction.

  In the electrode structure 10 of the electric dust collector in which the slit 14 is formed in the electrode 11 of the dust collecting portion, even if a static pressure difference occurs on the front and back of the electrode 11, the pressure difference is eliminated by the slit 14 as the through portion 13. The electrode 11 can be prevented from bending due to this pressure difference, the spatial distance between the adjacent electrodes 11 can be kept constant, the frequency of occurrence of sparks can be reduced, and the adhering suspended particulate matter can be prevented from scattering. Dust efficiency can be maintained.

  Further, in this electrode structure 10, in order to prevent the bending of the electrode 11, simply by forming the slit 14 in the electrode 11, the number of tie rod attachments can be increased by increasing the number of tie rod attachment holes 12 as in the prior art. Thus, the pressure loss is not increased structurally, and the dust collection area is not reduced, the number of parts is increased, and the weight is not increased.

  Therefore, even if the processing wind speed is increased, the bending due to the difference in static pressure of the electrode 11 in the dust collecting portion can be prevented, and in particular, the bending of the electrode 11 that is noticeable when the processing wind speed is 10 m / s or more can be prevented. The frequency of occurrence of sparks between adjacent electrodes can also be reduced.

  In addition, by reducing the frequency of occurrence of sparks, it is possible to prevent floating particulate matter from scattering from the surface of the electrode 11 due to vibration, and to prevent a reduction in dust collection efficiency.

  Furthermore, since the occurrence frequency of sparks is reduced, the load on the high voltage power supply device is reduced.

  Such an electrode structure 10 of the electrostatic precipitator can be applied to both the high-voltage side electrode and the ground-side electrode of the dust collector 6, and is also applied to only one of the high-voltage side electrode and the ground-side electrode. In particular, if the through-hole 13 such as the slit 14 is provided only on the high-voltage side electrode, the reduction of the dust collection area of the ground-side electrode that adsorbs the suspended particulate matter does not occur, and it is efficient. Can collect dust.

  Moreover, in this electrode structure 10, since the through-hole 13 is formed in order to reduce the static pressure difference between the front and back of the electrode 11, it is not limited to the long hole-shaped slit 14 and may be a through-hole of another shape. For example, like the electrode structure 10A of the electric dust collector shown in FIG. 2 (a), a plurality of circular through-holes 15 are arranged, or as in the electrode structure 10B of the electric dust collector shown in FIG. 2 (b). In addition, the triangular through portions 16 may be arranged in a plurality of different directions.

  Furthermore, the shape of the through hole may be any shape such as a square shape, a rectangular shape, a polygonal shape, and the number of the through holes is not limited to one or three in the center portion, but may be further reduced, The central portion of the space surrounded by the mounting hole 12 that supports the electrode 11 has the largest bend. It is efficient to form the through portion 13 and the like.

  In this embodiment, the case where the present invention is applied to the electrode of a two-stage type electric dust collector has been described as an example.

It is a front view concerning one embodiment of the electrode structure of the electric dust collector of this invention. It is a front view concerning other embodiment of the electrode structure of the electric dust collector of this invention. It is a top view of the schematic structure of the electric dust collector to which the dust collector electrode structure of the electric dust collector of this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric dust collector 2 Housing 3 Inlet 4 Charging part 4a Discharge line 4b Counter electrode 5 Outlet 6 Dust collector part 6a High voltage side electrode 6b Ground side electrode 7 DC high voltage 8 DC high voltage 10, 10A, 10B Electric dust collector Dust collector electrode structure 11 Electrode 12 Tie rod mounting holes 13, 15, 16 Through part 14 Slit G Gas flow direction

Claims (4)

An electrostatic precipitator equipped with an electrode for collecting charged dust particles,
An electrode structure of an electrostatic precipitator, wherein a penetrating portion penetrating front and back is provided in at least one of the high voltage side electrode and the ground side electrode of the electrode. 2. The electrode structure of an electrostatic precipitator according to claim 1, wherein the through portion is formed only in the high voltage side electrode. The electrode structure of an electrostatic precipitator according to claim 1 or 2, wherein the penetrating portion is constituted by a long hole-shaped slit. The electrode of the electrostatic precipitator according to any one of claims 1 to 3, wherein the electrode is an electrode of a single-stage electric precipitator or an electrode of a dust collector of a two-stage precipitator. Construction.

Images