JPS6029302B2 - electrostatic precipitator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic precipitator, and more particularly to an electrostatic precipitator with greatly improved dust collection efficiency.

An electrostatic precipitator generates a corona discharge between a discharge part and a dust collection part to form a loaded band, and the dust to be collected passes through this charged band and is charged. is collected in a bottle at the dust collector.

FIG. 1 is a plan view showing an example of an electrostatic precipitator commonly used in the past, in which the dust collecting part is a plate-shaped dust collecting electrode provided in parallel along the path of gas containing dust. l
a, lb, and the discharge part is the dust collection pole l.
A flat plate 2 extending in the middle part of a and lb, and fasteners 3a and 3b on the gas inflow side and the gas outflow side of this flat plate 2, respectively.
A discharge electrode 5 is constituted by the needle-like pieces 4a and 4b fixed by the needles 4a and 4b.

The needle-shaped pieces 4a are arranged at a predetermined pitch along the end of the flat plate 2 on the gas inflow side, and their tips extend toward the gas inflow side. Further, the needle-shaped pieces 4b are arranged at a predetermined pitch along the edge of the flat plate 2 on the gas outflow side.
Its tip extends toward the gas outflow side. In the electrostatic precipitator configured in this way, when a high voltage is applied between the dust collecting electrodes la, lb and the discharge electrode 5 so that the discharge electrode 5 becomes a negative electrode, dust is collected from the tip of the needle-like piece 4a. Corona discharge occurs toward the poles la and lb as shown by dotted lines.

On the other hand, when gas containing dust flows as shown by the arrow, most of the dust passing through the corona discharge area becomes negatively charged. Therefore, the part where this corona discharge occurs is constituted by a charged part, and the charged dust in this charged part is generated between the dust collecting electrodes la and lb and the discharge electrode 5. It is attracted by the electric field and collected at the dust collection poles la and lb. In addition, some of the oppositely charged dust that was not negatively charged in the charging section
It is configured to be collected on the surface of the flat plate 2 that constitutes the discharge electrode 5. However, in the dust collector having the above configuration, since a large number of needle-shaped pieces 4a and 4b are simply arranged in parallel at a predetermined pitch in the vertical direction, each discharge portion becomes a single discharge. .

As a result, the characteristics of the electrostatic precipitator, which are determined by the amount of charge, deteriorate, and accordingly, countermeasures such as using a plurality of units connected in series are required. To solve this problem, as shown in FIG. 2, a metal hollow pipe 6 is fixed to a frame 7 and installed vertically, and a needle-shaped piece 8 is passed through the hollow pipe 6. A discharge electrode has been proposed that extends along the gas flow direction. However, in an electrostatic precipitator having such a configuration, the limit is to duplicate the discharge portion, and it is impossible to obtain a sufficient amount of discharge. In addition, in such a configuration, the hollow pipe 6 is attached to the shield of the needle piece 8.
A large number of holes must be formed on the circumferential surface of the device, and the work is complicated, resulting in a relatively expensive product. In addition, a certain amount of dust collection area is required on the discharge electrode side for the oppositely charged dust, but in the above configuration, the surface area is naturally limited by the diameter of the hollow pipe 6. This has various drawbacks, such as the need to increase the dust collection area on the discharge electrode side by arranging plate electrodes or hollow pipes 9 in parallel. Therefore, an object of the present invention is to provide an electrostatic precipitator that is small in size and provides extremely high dust collection efficiency. Hereinafter, it will be explained in detail using the drawings. FIG. 3 is a plan view showing an embodiment of the electrostatic precipitator according to the present invention, and the same parts as in FIG. 1 are indicated using the same symbols.

In the same figure, a flat plate-shaped dust collecting pole is arranged parallel to the river.
Discharge electrode horizontal bodies are arranged in parallel at a predetermined interval along dust collecting electrodes la and lb at intermediate positions between a and lb. and,
This discharge electrode body is constructed as shown in FIG. 4, for example. In the figure, reference numerals 11a and 11b are conductive plates having an arcuate cross section, and the plate as a whole is trough-shaped. And this conductive plate 11a, 1
On the side green of 1b, a sawtooth portion 12 formed by cutting out by a press or the like is provided along the longitudinal direction of the rod-shaped bodies 11a, 11b. Reference numeral 13 denotes a needle-shaped body, which is integrated by penetrating the conductive plates 11a and 11b in the direction in which they are disposed in parallel with each other approximately in the middle of the dust collection poles.

In this case, the directions of the arcuate surfaces of the conductive plates 11a and 11b may be the same, or the directions may be reversed and faced to each other. Such conductive plates 11a and 11b are made by, for example, bending a band-shaped body having serrated portions 12 punched out by a press into an arc shape.

In this case, the mirror-toothed portion 12 has a sharpened tip, and the needle-shaped body 13 has a tip that sufficiently protrudes from the surface of the conductive plates 11a, 11b, and has a sharpened tip. A main discharge is performed at the tip of each mirror-toothed portion 12, and a sub-discharge is performed at the tip of each mirror-toothed portion 12. Therefore, an electrostatic precipitator hawk having such a discharge electrode horizontal body 10 has mirror-toothed portions 12 and needle-like bodies 13, as shown in FIG. Corona discharge is generated from the tip toward the dust collection poles la and lb, respectively.

In this case, since a large number of serrated portions 12 are provided along the longitudinal direction on the sides of the conductive plates 11a and 11b, countless electric discharges occur on both sides. Multiple discharge is performed by the body 13 and the mirror-toothed portion 12. In this manner, when multiple discharges occur, the corona discharge in the loaded portion becomes delicate and strong. Therefore, all of the dust passing through this charging section will be reliably charged, and accordingly, reliable and highly efficient dust collection will be performed. Further, in the discharge electrode horizontal body having such a configuration, the inner and outer surfaces of the arc-shaped conductive plates 11a and 11b can be effectively used as dust collecting surfaces for oppositely charged powder. This means that the inner surface of the conventional hollow pipe is also effectively utilized. In addition, in the above embodiment, the case where two conductive plates are integrated is explained, but the present invention is not limited to this, and it is sufficient to use a plurality of conductive plates. .

When these conductive plates are integrated using the needle-shaped body 13, the direction of the circular arc surface is not limited, and for example, it may be configured as shown in FIG. 5 a, b, and c. You can also do it. In addition, in the above embodiment, the sawtooth portion is triangular, but the present invention is not limited to this.
In short, it is fine as long as it has a sharp point. As explained above, according to the electrostatic precipitator according to the present invention, since multiple discharges are performed from almost all of the discharge parts, the width and density of the charged band become extremely high, and accordingly, the collected dust increases. It has an excellent effect of extremely high efficiency.

[Brief explanation of the drawing]

1 and 2 are a plan view and a perspective view of essential parts of an example of a conventional electrostatic precipitator, FIG. 3 is a plan view of an embodiment of an electrostatic precipitator according to the present invention, and FIG. FIG. 3 is a perspective view of essential parts of the discharge electrode body, and FIGS. 5 a to 5 c are plan views showing other configuration examples of the discharge electrode body. la, lb... Dust collecting electrode, 10... Discharge electrode body, 1
1a, 11b... Conductive plate, 12... Chain toothed part, 13
...Acicular body. Figure 1 Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] 1. A plurality of conductive plates having an arcuate cross-section and serrated teeth on both edges, and a predetermined number of through holes spaced apart from each other at a predetermined interval on the center line of the arc, and a predetermined number of needle-shaped bodies having sharpened ends. A discharge electrode structure is provided in which the plurality of conductive plates are fitted in plural stages through the predetermined number of through holes at appropriate intervals, and the predetermined number of needle-like bodies are fitted in multiple stages, and both ends of the needle-like bodies are sharpened. The predetermined number of needle-shaped bodies of the discharge electrode structure are formed by projecting from the conductive plates on both sides, and the predetermined number of needle-shaped bodies of the discharge electrode structure are located approximately in the center of two flat dust collection electrodes that are erected along the ventilation direction, and The discharge electrode structure is arranged along the ventilation direction and forms main discharge portions at both ends, and the sawtooth portions on both sides of the discharge electrode structure are oriented toward the dust collection poles on both sides to form sub-discharge portions, respectively. Characteristic electrostatic precipitator.