JPS6075344A - Electric dust-collector - Google Patents

Abstract

PURPOSE:To perform the dust-collection of high resistive dust and ignition substance easily by constituting a dust-collecting part in which two sheets of reticular bodies are placed side by side and also providing a nozzle spraying water between said bodies. CONSTITUTION:A dust-collecting part 12 is constituted by providing side by side at a prescribed interval with two sheets of reticular bodies 15 composed of a net 14 extended on frame bodies 13, and a nozzle 16 for spraying water is provided between said bodies 15. An electric discharge part 17 in which electrically conductive plates 19 having saw-toothed parts 18 are provided side by side at a prescribed interval is placed side by side toward said parts 12. D.C. high voltage is impressed across said parts 12 and part 17 to generate corona discharge on each tip of the saw-toothed parts 18, and the gas containing dust is flowed in the direction shown by arrows. The dust is adsorbed by the reticular bodies 15, but back corona phenomena are generated in case of high resistive dust, therefore water is sprayed from the nozzles 16. After the sprayed bodies are electrically charged, these are attracted on said parts 12 to cover the surface of the nets 14 and the resistance value of the high resistive dust collected to the dust-collecting parts 12 is lowered and a stable dust-collection is performed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic dust multiplication device, and more particularly to an electrostatic dust multiplication device suitable for collecting high resistance dust particles and flammable mists.

The electrostatic dust multiplier 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 an electrostatic multiplier that has been commonly used in the past. The dust collecting electrode 1a is the discharge part.

A flat plate 2 extending in the middle part of the ib, and a needle-like piece 4a fixed to the gas inflow side and the gas outflow side of the flat plate 2 by fasteners 3a and 3b, respectively.

4b constitutes a discharge electrode 5. The needle-like pieces 4a 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 electrostatic multiplication device configured in this way, when a full high voltage is applied between the dust collecting electrode 1a + lb and the discharge electrode 5, with the discharge electrode 5 becoming the negative electrode, the dust from the tip of the needle-shaped piece 4a Corona discharge occurs toward the dust collecting electrodes 1a + 1b 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, a charged band is formed in the area where this corona discharge occurs, and the dust charged in this charged band is
The dust is attracted by the high electric field generated between the dust collecting electrode 1a+lb and the discharge electrode 5, and is collected by the dust collecting electrode 1aelb. In addition, some of the oppositely charged dust that was not negatively charged in the charging band is discharged to the flat plate 2 constituting the pole 5.
0 surface.

However, the electrostatic multiplication device having the above configuration has two parts: a charging part in which a large number of needle-shaped pieces 4a and 4b are simply arranged in parallel at a predetermined pitch in the vertical direction, and an electric field part to which only an electric field is applied without corona discharge. It will be composed of

As a result, the characteristics of the electrostatic multiplier device determined by the amount of charge become extremely low, and the desired characteristics cannot be obtained unless multiple units are connected in series. turn into.

In addition, as shown in Figure 1, since the dust is collected only on a portion of the dust collection electrode 1a+lb, when handling high resistance dust, a pack corona occurs and dust collection cannot be performed. There is.

In order to solve this problem, the inventor of the present application has proposed a Harrah one-type electric dust multiplier as shown in Japanese Utility Model Publication No. 55-37243. As shown in Fig. 2, this electrostatic multiplier device consists of a discharge body 7 in which a needle-shaped piece 6 is implanted and a hollow metal rod 8 arranged in parallel.
19, and a dust collecting section 11 in which hollow metal rods 1O are arranged side by side along the discharge section 9. And the electrostatic multiplier device configured like this.

A strong corona discharge is generated from the tip of each needle-shaped piece 6 over almost the entire surface of the dust collection section 0.

Since the dust collection section 10 is constituted by an aggregate of hollow metal rods 8, the overall dust collection area increases, and the dust collection efficiency is greatly improved compared to the case shown in FIG.

However, even in the electrostatic dust multiplier with the above configuration, when high-resistance dust such as dust discharged from a coal zeiler is collected, the electric charge charged in the dust is no longer discharged, so a pack corona is generated and the dust is collected. I have a problem that makes it impossible to do this. Further, when a gas flow containing ignitable substances such as tar is handled, there is a problem that the substances collected in the dust collection section may ignite due to spark discharge or the like.

Therefore, an object of the present invention is to provide an electrostatic dust multiplication device suitable for collecting high resistance dust.

Another object of the present invention is an electrostatic dust multiplier suitable for collecting dust from ignitable substances! By providing i.

In order to achieve such an object, the present invention configures a dust collection section by arranging two mesh bodies in parallel, and
A nozzle for spraying water is provided between these two net-like bodies. below.

The electrostatic multiplication device according to the present invention will be explained in detail using the drawings.

FIG. 3 is a plan view of essential parts of an embodiment of the electrostatic multiplier according to the present invention. In the figure, reference numeral 12 denotes a dust collecting section, and as shown in FIG. 4, mesh bodies 15 each having a mesh 14 stretched over a frame body 13 are arranged in parallel at predetermined intervals. 16
Reference numeral 17 indicates a nozzle that sprays water between the two net-like bodies 15 that constitute the dust collection section 12, and 17 indicates a discharge section that is arranged in parallel to the dust collection section 12, and has a sawtooth structure as shown in FIG. Conductive plates 19t having shaped portions 18 are integrated in a state where they are arranged in parallel at a predetermined interval.

In the electrostatic multiplication device configured in this way, when a DC high voltage is applied between the dust collection section 12 and the discharge section 17, the discharge occurs between the section 17t and the serrated section 18 of the conductive plate 19 constituting the section 17t. Corona discharge occurs at the tip.

In this state, when a gas containing dust is flowed in the direction of the arrow, for example, the dust is adsorbed by the mesh body 15 constituting the dust collecting section 15Th. In this case, high resistance dust is
If a small amount of dust is collected in the dust collecting section 15, the electric charge generated by Wi is not easily discharged and becomes a charge accumulation body, causing a pack corona phenomenon and making it impossible to collect dust. Here, when water (water bath liquid) is sprayed from the nozzle 16,
The spray passes through the mesh of the net-like body 15 and spreads even to the outer part as shown by B in FIG. Then, the atomized body is charged by corona discharge and then sucked into the dust collection section 12 constituted by the mesh body 15.

As a result, the surface 'lr of the net 14 constituting the net-like body 15:
Since the rgL mist covers the high-resistance dust collected in the dust collecting section 12, water is adsorbed to the high-resistance dust and its resistance value is lowered. For this reason, the dust whose resistance has been lowered will not generate pack corona, and stable dust collection will be easily performed. In addition, since the sprayed water flows over the entire surface of the net 14 constituting the net 15 in the form of a film, the collected dust can be easily washed away, and especially tarry dust can be washed away. It is suitable for collecting dust. Furthermore, since a single mist of water surrounds the dust collecting section 12, when collecting ignitable substances such as tar, the risk of ignition due to sparks etc. can be significantly reduced. This makes it easier to collect dust from ignitable substances.

In addition, if the dust is water-generating, a sea surfactant or the like may be added, and water ejection may be made continuous or intermittent as necessary. Furthermore, the discharge part does not necessarily have to be an assembly of conductive plates having serrated parts;
It may have any structure. Furthermore, in the above embodiments, the net itself was used as the net-like body, but punch metal is also included in the net-like body here.

As explained above, according to the electric dust device according to the present invention, high-resistance dust can be easily collected, and
It has an excellent effect of preventing the risk of ignition when collecting dust from ignitable substances.

[Brief explanation of the drawing]

1 and 2 are a plan view and a perspective view of essential parts showing an example of a conventional electrical dust device, FIG. 3 is a plan view of essential parts showing an embodiment of an electrical dust device according to the present invention, and FIG. This figure is a side view showing an example of the sink collection section 12 shown in FIG. 3, and FIG. 5 is a perspective view showing an example of the discharge section shown in FIG. 3. 12...Dust collection part, 13...Frame body, 14...Net. 15... Net-like body, 16... Nozzle, 17... Dust collection m11B... Serrated part, 19... Conductive plate. Figure 1 Figure 3 Figure 4

Claims (3)

[Claims] (1) In an electric dust multiplier in which a dust collection part and a discharge part are arranged facing each other with a predetermined distance apart, the dust collection parts are
4.It is composed of two net-like bodies arranged facing each other with a certain distance between them, and has a nozzle in the vicinity of the net-like body that sprays a liquid between the two net-like bodies in the form of a mist. Particle multiplication device. (2) The electrostatic multiplier device according to claim 1, wherein the discharge section is constituted by an assembly of conductive plates arranged side by side having serrated portions on the sides. (3) The electrostatic multiplication device according to claim 1, wherein the nozzle sprays the liquid intermittently.