JP6846596B2 - Electrostatic precipitator - Google Patents

Description

The present invention relates to an electrostatic precipitator that collects suspended particulate matter (SPM) in the air.

Conventionally, in this type of electrostatic precipitator, a high DC voltage is applied to the discharge electrode plate of the charging part to generate a corona, and the dust passing through the charging part is charged. A technique of collecting this charged dust on the surface of the grounding electrode plate by electrostatic force by a strong electric field of a dust collecting portion having a load electrode plate to which a high DC voltage is applied and a grounding electrode plate to be grounded is widely used. It is known (see, for example, Patent Document 1).

Hereinafter, the electrostatic precipitator will be described with reference to FIGS. 7 and 8.

As shown in FIG. 7, the electrostatic precipitator is composed of a charging unit 204 and a dust collecting unit 208. High voltage is supplied to the charging unit 204 and the dust collecting unit 208 from the high voltage power supplies 203 and 207, respectively. In the charged portion, a high voltage is applied to the discharge electrode plate 202, and a corona discharge (not shown) occurs in the space with the ground electrode plate 201. The ions generated by this corona charge the dust in the space, and the dust is charged. The charged dust is collected on the surface of the ground electrode plate 205 by an electrostatic force due to a high electric field formed between the load electrode plate 206 and the ground electrode plate 205 at the leeward dust collecting portion 208. A plurality of thorn-shaped protrusions 202b are formed on the discharge electrode plate 202 of the charging unit of the electrostatic precipitator, and the corona discharge is efficiently generated and collected by increasing the electric field by the thorn-shaped protrusions 202b. The dust performance is improved.

JP-A-2002-20192014

It is known that when such a conventional electrostatic precipitator is used for a long period of time, the tip of the thorn-shaped protrusion of the release electrode plate is gradually thinned and rounded (see FIG. 8). When the tip of the thorn is rounded, the electric field generated by the electric discharge becomes weak, and there is a problem that the dust collection performance is lowered.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems, and to provide an electrostatic precipitator in which the tip of a thorn of a release electrode plate is thinned and the dust collecting performance is not deteriorated even if it is rounded.

Then, in order to achieve this object, the electrostatic precipitator according to the present invention has a charging portion in which a plurality of ground electrode plates and a plurality of discharge electrode plates are alternately arranged in parallel, and the discharge electrode plate is provided with a charging portion. It is characterized by having a thorn-shaped protrusion for corona discharge at the end on the windward side and / and the leeward side, and having an opening in the protruding portion of the thorn-shaped protrusion. It achieves the purpose.

According to the present invention, the release electrode plate has a thorn-shaped protrusion for corona discharge at the end on the windward side and / and the leeward side, and the thorn-shaped protrusion has an opening at the protruding portion. As a result, when the thorn-shaped protrusions are thinned and rounded, the outer periphery of the thorn-shaped protrusions and the opening are connected to generate a new thorn-shaped protrusion, and it is possible to obtain the effect of suppressing a decrease in dust collection performance.

Explanatory drawing which shows the structure of the electrostatic precipitator of Embodiment 1 of this invention Enlarged view showing the structure of the charged part of Embodiment 1 of this invention An enlarged view showing the operation of the release electrode plate according to the first embodiment of the present invention. An enlarged view showing the operation of the release electrode plate according to the second embodiment of the present invention. An enlarged view showing the operation of the release electrode plate according to the third embodiment of the present invention. An enlarged view showing the operation of the release electrode plate according to the fourth embodiment of the present invention. Explanatory drawing which shows the structure of the conventional electrostatic precipitator Enlarged view showing the operation of the conventional release electrode plate

The electrostatic precipitator according to the present invention has a charging portion in which a plurality of ground electrode plates and a plurality of discharge electrode plates are alternately arranged in parallel, and the discharge electrode plate is an end portion on the windward side or / and the leeward side. Has a thorn-shaped protrusion for corona discharge, and has an opening in the protruding portion of the thorn-shaped protrusion. When the tip of the thorn-shaped protrusion is thinned and rounded, it becomes the outer circumference of the thorn-shaped protrusion. The openings are connected to generate a new thorn tip, and the effect of suppressing deterioration of dust collection performance can be obtained.

Further, the opening may be circular. Alternatively, the opening may have an arc shape on the tip end side of the thorn-shaped protrusion. As a result, the tip of the thorn-shaped protrusion is rounded, and when the outer circumference of the thorn-shaped protrusion and the opening are connected, the new thorn tip generated becomes a sharp shape, which has the effect of suppressing deterioration of dust collection performance. Obtainable.

Further, the openings may be provided at two positions per one thorn-shaped protrusion, and the minimum distance between the tip of the thorn and the two openings may be equal in one thorn-shaped protrusion. As a result, the tip of the thorn-shaped protrusion is rounded, and when the outer circumference of the thorn-shaped protrusion and the opening are connected, three new thorn tips are generated, which has the effect of suppressing deterioration of dust collection performance. Can be obtained.

Further, the opening may be triangular in shape, and one side of the opening may be orthogonal to the wind direction and may be located on the tip side of the thorn. As a result, the tip of the thorn-shaped protrusion is rounded, and when the outer circumference of the thorn-shaped protrusion and the opening are connected, the new thorn tip portion that is generated becomes a new triangular shape, and the dust collection performance is deteriorated. Can be obtained with the effect of suppressing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
First, the configuration and operation of the electrostatic precipitator 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. Note that FIG. 1 is an explanatory view showing the configuration of the electrostatic precipitator 1 according to the first embodiment of the present invention, and FIG. 2 is an enlarged view showing the configuration of the charging unit 2 according to the first embodiment of the present invention. is there.

The electrostatic precipitator 1 is composed of a charging unit 2 on the upstream side of the flow path in the wind direction 9 and a dust collecting unit 3 on the downstream side of the flow path. The charging portion 2 has a structure in which the discharge electrode plate 4 and the charging portion grounding electrode plate 5 are alternately arranged in parallel at intervals. The dust collecting portion 3 has a configuration in which the load electrode plate 6 and the dust collecting portion grounding electrode plate 7 are alternately arranged side by side at intervals. The release electrode plate 4 is formed with a plurality of thorn-shaped protrusions 8 on the upstream end side and the downstream end side of the wind direction 9. The thorn-shaped protrusion 8 has one or more openings 10. As shown in FIG. 3, the opening 10 has an elongated hole shape in which the tip end side of the thorn is arcuate. The openings 10 are arranged so as to be line-symmetric with respect to a straight line parallel to the wind direction 9 and passing through the tip of the thorn. Further, in the opening 10, the opening portion is arranged in the protruding portion as the thorn-shaped protrusion 8. The shorter the distance between the opening 10 and the tip of the thorn, the shorter the period until a new tip of the thorn, which will be described later, is generated, but this is determined by the design conditions when molding the release electrode plate 4.

In the present embodiment, the case of a two-stage electrostatic precipitator in which the dust collecting unit 3 is provided separately from the charging unit 2 will be described, but the charging unit 2 and the dust collecting unit 3 are shared in one stage. It may be a type electrostatic precipitator. Further, the thorn-shaped protrusion 8 may be provided on either the upstream end side or the downstream end side of the release electrode plate 4.

Here, the operation of the electrostatic precipitator 1 will be described. Exhaust gas in the tunnel is guided to the electrostatic precipitator 1 by a ventilation fan (not shown). In the electrostatic precipitator 1, by applying a high voltage to the discharge electrode plate 4 in the charging unit 2, a corona discharge (not shown) is generated in the space between the discharge electrode plate 4 and the grounding electrode plate 5 of the charging unit. The ions generated by this corona charge the dust in the space, and the dust is charged. The charged dust is collected by electrostatic force from the dust collecting part grounding electrode due to the high electric field formed in the space between the load electrode plate 6 to which a high voltage is applied and the grounded dust collecting part grounding electrode plate 7 in the dust collecting part 3. It is collected on the surface of the plate 7. A plurality of thorn-shaped protrusions 8 are formed on the release electrode plate 4, and the corona discharge is efficiently generated by strengthening the electric field by the thorn-shaped protrusions 8 to improve the dust collection performance.

Subsequently, the characteristic portion of the electrostatic precipitator 1 in the present embodiment will be described with reference to FIG. Note that FIG. 3 is an enlarged view showing the release electrode plate 4 of the first embodiment of the present invention.

In the electrostatic precipitator 1, a high voltage is applied to the discharge electrode plate 4 to positively generate a corona discharge, so that the discharge electrode plate 4 itself generates a battery action that is a cause of metal corrosion. .. Further, since it is necessary to clean the collected suspended particulate matter, the electrostatic precipitator 1 periodically performs water cleaning. That is, it is considered that the release electrode plate 4 is likely to be corroded (weared) due to the impact of the ions released by the electric discharge and the oxidation of the metal. In particular, it is considered that the thorn-shaped protrusion 8 in which the electric field is concentrated is more likely to be corroded, and the tip of the thorn-shaped protrusion 8 is gradually thinned and rounded by long-term use. When the tip of the thorn is rounded, the electric field becomes weak and the dust collection performance begins to deteriorate. When the thorn-shaped protrusion 8 is rounded to the opening 10 and the outer circumference of the thorn-shaped protrusion 8 and the opening 10 are connected, the first thorn-shaped protrusion 8a and the second thorn-shaped protrusion 8b are newly generated. That is, the electric field of the charged portion 2 becomes stronger due to the new generation of the first thorn-shaped protrusion 8a and the second thorn-shaped protrusion 8b. That is, a corona discharge is likely to occur in the space between the release electrode plate 4 and the grounding electrode plate 5 of the charging portion, and the dust in the space is likely to be charged. As a result, the dust collecting performance of the electrostatic precipitator 1 is restored, and even if the thorn-shaped protrusions 8 are rounded, the deterioration of the dust collecting performance can be suppressed.

Moreover, since the number of thorn-shaped protrusions 8 is doubled, improvement in dust collection performance can be expected.

In the present embodiment, the opening 10 has an elongated hole shape, but it may be circular. Alternatively, it may have an elliptical shape.

(Embodiment 2)
In FIG. 4, the same components as those in FIGS. 1 to 3 are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 4 is an enlarged view showing the release electrode plate 4 of the second embodiment of the present invention.

As shown in FIG. 4, the thorn-shaped protrusion 8 may have two openings 10. As a result, the thorn-shaped protrusion 8 is rounded to the two openings 10, and when the outer circumference of the thorn-shaped protrusion 8 and the two openings 10 are connected, the first thorn-shaped protrusion 8a, the second thorn-shaped protrusion 8b, and the third are newly connected. Thorn-shaped protrusions 8c are generated. The electric field can be strengthened by the newly generated first thorn-shaped protrusions 8a, second thorn-shaped protrusions 8b, and third thorn-shaped protrusions 8c, and deterioration of dust collection performance can be suppressed.

Moreover, since the number of thorn-shaped protrusions 8 is tripled, further improvement in dust collection performance can be expected.

(Embodiment 3)
In FIG. 5, the same components as those in FIGS. 1 to 3 are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 5 is an enlarged view showing the operation of the release electrode plate 4 according to the third embodiment of the present invention.

As shown in FIG. 5, the shape of the opening 10 of the thorn-shaped protrusion 8 may be arcuate only on the tip side of the thorn. As a result, the thorn-shaped protrusion 8 is rounded to the opening 10, and when the outer circumference of the thorn-shaped protrusion 8 and the opening 10 are connected, a first thorn-shaped protrusion 8a and a second thorn-shaped protrusion 8b are newly generated. The electric field can be strengthened by the newly generated first thorn-shaped protrusions 8a and the second thorn-shaped protrusions 8b, and the deterioration of the dust collecting performance can be suppressed.

Moreover, since the number of thorn-shaped protrusions 8 is doubled, further improvement in dust collection performance can be expected.

(Embodiment 4)
In FIG. 6, the same components as those in FIGS. 1 to 3 are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 6 is an enlarged view showing the operation of the release electrode plate 4 according to the fourth embodiment of the present invention.

As shown in FIG. 6, the shape of the opening 10 of the thorn-shaped protrusion 8 may be triangular. One side of the triangular opening 10 is arranged so as to be orthogonal to the wind direction 9, and the side orthogonal to the wind direction 9 is arranged on the tip side of the thorn. As a result, the thorn-shaped protrusion 8 is rounded to the opening 10, and when the outer circumference of the thorn-shaped protrusion 8 and the opening 10 are connected, a first thorn-shaped protrusion 8a and a second thorn-shaped protrusion 8b are newly generated. The electric field can be strengthened by the newly generated first thorn-shaped protrusions 8a and the second thorn-shaped protrusions 8b, and the deterioration of the dust collecting performance can be suppressed.

Further, since the opening 10 has a triangular shape, the newly generated first thorn-shaped protrusions 8a and second thorn-shaped protrusions 8b are triangular and tend to have sharper thorns, and further improvement in dust collection performance is expected. it can.

In the electrostatic precipitator according to the present invention, even if the thorn-shaped protrusions of the discharge electrode plate are thinned and rounded, new thorn-shaped protrusions are generated on the discharge electrode plate, and deterioration of dust collection performance can be suppressed. It is useful in a wide range such as a long replacement period of the release electrode plate.

1 Electrostatic precipitator 2 Charging part 3 Dust collecting part 4 Discharge electrode plate 5 Charging part grounding electrode plate 6 Loading electrode plate 7 Dust collecting part grounding electrode plate 8 Thorn-shaped protrusion 8a 1st thorn-shaped protrusion 8b 2nd thorn-shaped protrusion 8c 3rd spine-like protrusion 9 Wind direction 10 Opening

Claims (5)

In an electrostatic precipitator having a charging part in which a plurality of ground electrode plates and a plurality of emission electrode plates are alternately arranged in parallel.
The release electrode plate has spiny protrusions for corona discharge at the windward and / and leeward ends.
An electrostatic precipitator characterized by having an opening in a protruding portion of the thorn-shaped protrusion. The electrostatic precipitator according to claim 1, wherein the opening is circular. The electrostatic precipitator according to claim 1, wherein the opening has an arc shape on the tip end side of the thorn-shaped protrusion. Two openings are provided for each thorn-shaped protrusion.
The electrostatic precipitator according to claim 1 or 2, wherein in one thorn-like projection, the minimum distance between the thorn tip and the two openings is equal. The opening has a triangular shape.
The electrostatic precipitator according to claim 1, wherein one side of the opening is orthogonal to the wind direction and is located on the tip side of the thorn.

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