JPS58119355A - Electric dust collecting apparatus - Google Patents

Abstract

PURPOSE:To obtain a dense corona discharge zone due to multiplex discharge, by parallelly arranging discharge electrodes constituted of conductive plates having serrated parts and needle like bodies. CONSTITUTION:When high voltage is applied between dust collecting electrodes 1a, 1b and each discharge electrodes 6a-6c so as to make the dust collecting electrodes 1a, 1b positive, as representatively shown by the discharge electrode 6a of a gas inflow side, corona discharge is generated toward the dust collecting electrodes 1a, 1b from the respective leading ends of needle bodies 12 and each serrated parts 8 and, with the generation of corona discharge, multiplex discharges are respectively carried out at each discharge electrodes 6a-6c. In this case, because conductive plates constituting each discharge electrodes 6a- 6b have wide flat surface parts, these flat surface parts function as dust collecting surfaces of negatively charged dust and, therefore, it is unnecessary to provide a member constituting a dust collecting surface to the side of the discharge electrode.

Description

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

Electric industrial dust equipment generates a corona discharge between a discharge part and a dust collection part to form a charged band, and the dust to be collected is passed through this charged band and charged, and the charged dust is charged. The dust is collected by suction into the dust collecting section.

FIG. 1 is a plan view showing an example of a conventional electrical industrial dust device. It is composed of dust collecting electrode 1aeib, and the discharge part is dust collecting electrode 1&.

A flat plate 2 extending in the middle part of 1b, and metal fittings 3 m + 3 on the gas inflow side and the gas outflow side of this flat plate 2, respectively.
The discharge electrode 5 is constituted by the needle-like pieces 4 m +4 b fixed by the electrodes 4 m and 4 b. The needle-like pieces 41 are planted 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-like pieces 4b are planted at a predetermined pitch along the end of the flat plate 2 on the gas outflow side, and their tips extend toward the gas outflow side.

In the electrical industrial dust device configured as described above, when a high voltage is applied between the dust collecting electrodes 1a, 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. pole 1
Corona discharge occurs as shown by the dotted line toward m and 1b. On the other hand, when dust is included and friend gas 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 falsely constituted as a charged part9, and the dust charged in this charged part is transferred to the dust collecting electrode 1aslb.
The dust is attracted by the high electric field generated between the dust collecting electrode 1ae and the discharge electrode 5, and the dust collecting electrode 1ae and 1bK are collected. Further, a part of the reversely charged dust that has been negatively charged in the charging section is configured to be collected on the surface of the flat plate 2 constituting the discharge electrode 5.

However, the electrical industrial dust device with the above configuration has a charging section in which a large number of needle-like pieces 4&, 4b are simply arranged side by side at a constant pitch in the vertical direction (K)5'i, and only an electric field is generated without corona discharge. and K
Become. As a result, the characteristics of the electrical industrial dust device determined by the amount of charge become extremely low, and the desired characteristics cannot be obtained unless multiple gourd knits are connected in series, resulting in an extremely large device as a whole. It has the problem of

Accordingly, an object of the present invention is to provide an electric industrial dust apparatus which has extremely high dust collection efficiency and can therefore be made significantly smaller in size as a whole compared to the conventional apparatus.

Therefore, the electrical industrial dust device according to the present invention has a peel part disposed along the gas path and a discharge part disposed in parallel at a predetermined distance m from the tank part. In the electrical industrial dust device, the discharge section includes a conductive plate extending in one orthogonal direction along the front dust part and whose width direction is substantially perpendicular to the front dust part, and the conductive plate. It is composed of a serrated part provided at the widthwise end of the body, and a nine-needle-shaped body that protrudes from the surface of the conductive plate parallel to the dust collection part and has a needle-like tip. The needle-shaped body protrudes sufficiently long with respect to the width of the conductive plate, and its tip is sharpened to cause a main corona discharge between the needle-like body and the front spark electrode. , the serrated portion has a shape of its tip and a distance tρ between it and the dust collecting electrode so as to cause a secondary corona discharge when it interacts with the dust collecting electrode. DESCRIPTION OF THE PREFERRED EMBODIMENTS The electrical industrial dust device according to the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a plan view showing an embodiment of an electrical industrial dust device manufactured by Kinei aAK, and the same parts as in FIG. 1 are indicated using the same symbols. In the same figure, 6m, 6bs 6e are arranged at a predetermined interval between the middle position of the dust collection poles 119 lb arranged in parallel and the dust collection poles 1ms lb, that is, the discharge voltage is influenced by each other's 3 vagina. The discharge electrodes are arranged in parallel with a certain distance between them. The discharge electrodes 61-6 are configured as shown in FIG. 3, for example. In the figure, reference numeral 7 denotes a conductive plate made of stainless steel or the like and having a band shape with a thickness of about 3 mm. The side edges along the longitudinal direction of the conductive plate 7 are partially cut out in the shape of valleys at pitches using a press or the like, so that a large number of serrations s8 are formed with some pits. Next, the upper end 9 and the lower end (not shown) of the conductive plate 7 are bent by 90'' in the thickness direction to form a mounting part 10, and a locking bolt is installed in the center of this mounting s10. A stopper hole 11 is formed for passing the conductive plate 70 through the conductive plate 70. In addition, needles are formed along the central part of the conductive plate 70 in the width direction at predetermined pitches, that is, at pitches that do not affect the discharge at each tip. The needle-shaped body 12 penetrates vertically and is fixed by a welding hole.In this case, the amount of protrusion of the needle-shaped body 12 is set to be sufficiently large compared to the amount of protrusion of the serrated portion 8. In addition, the tip of the needle-like body 12 is sharper than the tip of the needle-like body 12. Therefore, the tip of the needle-like body 12 is more likely to cause corona discharge than the tip of the serrated portion 8, and therefore the needle-like body The tip of 12 becomes the main discharge part, and each sawtooth part 8
The tip of K constitutes a sub-discharge section.

In the electrical industrial dust apparatus configured in this way, the dust collecting electrode 1 is installed between the dust collecting electrodes 1a, lb and each of the discharge electrodes 61 to 6c.
When a high voltage is applied so that a and lb are positive, K and the needle-shaped body 12 as shown in FIG.
A corona discharge is generated from the tip of the serrated portion 8 and the tip of each serrated portion 8 toward the dust collecting electrode 1m+1b, and as a result, multiple discharges are generated in each of the discharge electrodes 6a to 6c. Become. In this way, when multiple discharges occur to form a charged section, the corona discharge in this charged section becomes dense and extremely strong. Therefore,
All of the dust passing through this charging section is reliably charged, and as a result, the dust collection efficiency is greatly improved. In other words, this is because the characteristics of the electrical industrial dust device are determined by the charging part.

In this case, in the electrical industrial dust device having the above configuration, since the conductive plate 7 constituting each discharge electrode 6a to 6c has a wide plane S, this is the collecting surface for the oppositely charged dust. Accordingly, there is no need to provide a member constituting a new dust collection surface on the discharge electrode side. The plane portion of this conductive plate 7 has a dust collection pole of 1 m.

Since the dust collecting electrode 11 is provided perpendicularly to the surface of the dust collecting electrode 1b, the direction of the highest strength is directed toward the dust collecting electrode 11°1b, and as a result, a large acting force is applied between the two electrodes due to the electric field. However, there is no problem. Friend, since the flat part of the conductive plate 7 is set in a direction that intersects the inflowing gas, it is necessary to have a sufficient dust collection area without increasing the length in the direction along the gas flow. It is important to be able to do this.

In the above embodiment, the case where flat plates are used as the dust collection electrodes 1a and 1b is explained, but the present invention is not limited to this, and various shapes such as hollow 9-hole electrodes are arranged side by side. Needless to say, any structure can be used.

As explained above, the electrical industrial dust device according to the present invention has the following features:
In an electric industrial equipment having a dust collection part arranged along a gas passage and a discharge part arranged in parallel at a predetermined distance from a pre-starting dust part, the discharge part is A conductive plate extending vertically along the front dust part and having its width direction approximately perpendicular to the front dust part; and a conductive plate provided at the widthwise end of the conductive plate. It has a discharge electrode constituted by a serrated part and a nine-needle-like body that projects from the surface of the conductive plate parallel to the dust collection part and has a needle-like tip. The needle-shaped body protrudes sufficiently long with respect to the width of the conductive plate, and its tip is sharpened to generate a primary corona discharge between it and the front spark. The shape of the tip and the distance from the dust collecting electrode are determined so as to cause a secondary corona discharge between the dust collecting electrode and the dust collecting electrode. Therefore, there is an excellent effect that the dust collection efficiency is greatly improved and the device can be sufficiently miniaturized.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a conventional electrical industrial dust device, FIG. 2 is a plan view showing an embodiment of an electrical industrial dust device according to the present invention, and FIG. FIG. 3 is a perspective view of a main part of an electrode. la, lb... Dust collection electrode, 6jL to 6C... Discharge electrode, 7... Conductive plate, 8... Serrated portion, 10... Mounting part, 11... Mounting hole, 12. ...Acicular body. Agent Patent Attorney '** ~ Sound Q5 No. 1' Engraving on page 21 (no change in content) Figure 1 a Figure 2 a Figure 3 Procedural amendment (method) % formula % 1. Display of case 1986 Year Patent Application No. 1110476 2, Title of invention Electrostatic precipitator 3, Relationship with the case of the person making the amendment Patent applicant address Name Akiyo Hara 4, Agent 6, Invention increased by amendment number

Claims (1)

[Claims] (1) A dust collection section arranged along the gas passage;
In an electrical industrial dust equipment having a discharge part arranged in parallel at a predetermined distance from the industrial dust part,
The discharge part includes a conductive plate extending vertically along the front dust part and whose width direction is substantially perpendicular to the front dust part, and a conductive plate provided at an end in the width direction of the conductive plate. and a discharge electrode constituted by a serrated part and a needle-like body that projects parallel to the dust collection sK from the surface of the conductive plate and has a needle-like tip, The needle-shaped body protrudes sufficiently long with respect to the width of the conductive plate, and its tip is sharpened to perform main corona discharge between the front spark pole and the serrated part. Between-
1. An electrical industrial dust device, characterized in that its tip shape and distance from a dust collection electrode are determined so as to produce a corona discharge.