JPS64103B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for removing pollutants floating in the air such as smoke, and more specifically, the present invention relates to a device for removing pollutants floating in the air such as smoke. The present invention relates at least to a smoke removal device using a so-called electric dust collection method that collects the smoke on a dust collecting electrode.

When collecting extremely high concentration dust such as smoke with an electrostatic precipitator, if the dust fills the discharge space between the discharge electrode and the counter electrode, it will cause the discharge electrode to be charged near the discharge electrode and have the same polarity. Since the charged dust shields the discharge space, the discharge current may decrease and the dust collection efficiency may be significantly lowered. To prevent this phenomenon, it is necessary to charge the dust as close to the counter electrode as possible.

Conventionally, thin wire-shaped electrodes as shown in Figure 1 and fishbone-shaped electrodes as shown in Figure 3 have been used as discharge electrodes in electrostatic precipitators, but these electrodes do not allow corona. As discharge occurs in all directions from the electrode surface, the corona wind and the air supplied to the corona wind collide with each other, causing turbulence, and as a result, the discharge space is filled with smoke, causing dust collection as described above. This has the disadvantage that the discharge electrode becomes dirty in a short period of time.

In order to eliminate such drawbacks, a discharge electrode that discharges with a protruding end in one direction is provided inside a cylindrical electrode that forms a flow path, and the protruding end of the discharge electrode is opposed to the concave surface of the curved breathable electrode. There is a method to make the curved electrode 3 close to the cylindrical electrode 1 as shown in FIG.
When the flow velocity of the flow path increases, the airflow entering the flow path 2 from the periphery of the breathable electrode along the end surface of the open end 5 changes direction greatly, causing turbulence. This resulted in a decrease in dust adhesion.

In addition, in the above-mentioned dust collector, which consists of a curved breathable electrode, a discharge electrode that discharges at the protruding end in one direction, and a cylindrical electrode, if the discharge at the protruding end is biased, the air entering the flow path will be affected by the corona wind. Since the dust enters concentratedly from the periphery of the permeable electrode, which is the weak part, a plurality of such dust collectors are integrated as a unit as shown in FIG. The dust collector provided at the end face has the disadvantage that the influence of the biased corona discharge extends to adjacent units.

The present invention eliminates the above-mentioned drawbacks of conventional devices, and provides a device for removing smoke, etc., which has excellent dust collection performance when removing dense dust such as smoke, and also causes less contamination of discharge electrodes. be.

Next, the configuration of the present invention will be explained based on examples.

FIG. 5 is a sectional view of a smoke removal device according to an embodiment of the present invention, and FIG. 7 is a perspective view thereof.

In these figures, the inside of a square cylinder 24 forming a flow path 2 and having an electrode plate 1 on its inner surface is partitioned by one concave breathable electrode 3. A knife-shaped corona discharge electrode 4 is provided facing the outflow side of the channel 2 and discharges at one protruding end 12 in one direction. A charging section 15 is formed between the two.

A dust collection part 16 is formed in the cylinder on the outflow side of the charging part 15 by providing dust collection electrodes 7 and repulsion electrodes 11 alternately at intervals.

FIG. 8 is a perspective view of another embodiment of the present invention, and the smoke removal device shown in this figure has a cylinder 24 forming a flow path 2 whose interior is partitioned by one hemispherical breathable electrode 3. A needle-shaped corona discharge electrode 4 that discharges at the protruding end 12 is provided opposite to the concave surface of the breathable electrode 3 facing the outflow side of the channel 2, and the inner surface of the cylindrical body 24 on the outflow side of the breathable electrode 3 is ventilated. An electrode 1 was provided next to the electrostatic electrode 3 to form a charging section, and a dust collection section was provided following the charging section, which was formed by an electrode 7 inscribed in the cylindrical body 24 and a repelling electrode 11 opposite thereto. It's structured.

The size of the micropores in the breathable electrode 3 of the present invention is preferably small enough to allow smoke particles to pass through, but if the pore size is too small, the pressure drop in the flow path will increase, so a range of 0.5 mm to 5 mm is appropriate. When it exceeds 5 mm, the chargeability of smoke particles decreases.

Such a breathable electrode can be made of wire mesh, punched metal, metal felt, conductive fiber, or the like, but it may also be made of open-cell sponge made of conductive plastic.

In addition, it is more desirable that the breathable electrode 3 is absorbent to prevent clogging caused by attached smoke particles, but such a breathable electrode may be made of a conductive material such as wire mesh, cloth, or a bulb. It may also be a breathable electrode laminated with absorbent materials such as.

Next, the functions and effects of the present invention will be explained.

Now, in the embodiments shown in FIGS. 5 and 7, when a high voltage is applied between the discharge electrode 4, the breathable electrode 3, and the electrode 1 by a high voltage power source (not shown),
Corona discharge occurs at the protruding end 12 of the discharge electrode 4,
The corona ions become a corona wind and are radiated onto the concave surface of the opposing breathable electrode 3 and the surface of the electrode 1 as shown by the arrow 8, and the ion wind is not radiated to the protruding end 12 as shown by the arrow 17. Discharge electrode 4 from the rear
Air is supplied along the sides.

Under such circumstances, when dust-containing air is sent into the flow path 2 by a blowing means (not shown), the air flows through the cylindrical body 2.
4 enters the partition section partitioned by the breathable electrode 3 from the open end 5 on the inflow side of the tube 24, reaches the convex surface of the breathable electrode 3 as a flow parallel to the wall surface of the cylinder body 24.

Next, the air that has passed through the breathable electrode 3 immediately combines with the ion wind and removes the contained dust from the breathable electrode 3.
The dust is charged in the vicinity of the concave surface, and flows along the concave surface from the peripheral edge onto the surface of the electrode 1 provided on the wall surface of the cylinder 24, and the charged dust is collected by the electrode 1 and the subsequent dust collecting section 16. The purified air is then discharged to the outside.

In the present invention, in which the protruding end 12 of the discharge electrode 4 that discharges at the protruding end 12 in one direction is opposed to the concave surface of the concave air-permeable electrode 3, the ion wind and the supplied air are used as a countermeasure as described above. Since they never meet, the ion wind becomes a steady flow with a constant direction. Therefore, the charged dust near the concave surface of the breathable electrode 3 is pressed by the steady corona wind and flows along the concave surface, so that the charged dust fills the discharge space and improves the dust collection performance, as in the conventional device. It will not deteriorate.

Furthermore, in the present invention, since the inside of the cylindrical body 24 forming the flow path 2 is partitioned by the concave air permeable electrode 3,
The air entering the flow path 2 flows parallel to the wall surface of the cylindrical body 24 and then passes through the concave air permeable electrode 3. Therefore, since the air flowing near the wall of the cylinder 24 hardly changes its direction after passing through the concave breathable electrode 3, the concave breathable electrode is provided at the open end of the flow path even when the flow rate increases. Airflow is not disturbed due to a sharp direction change as in the case, and dust collection performance is not deteriorated.

Further, in the device of the present invention having a partition section following the open end 5 of the channel 2, even when a plurality of devices are used in an integrated manner, the wall of the partition section is located between the adjacent channel. Therefore, even if there is a bias in the discharge within the flow path, the influence will not be exerted on the adjacent flow path and the dust collection performance will not be deteriorated.

Furthermore, in the present invention, the protruding end 12 of the discharge electrode 4 that discharges with the protruding end 12 in one direction faces the inflow side of the flow path 2, so that the air supplied to the discharging end 12 is purified air. Therefore, contamination of the discharge electrode is extremely low.

Thus, the present invention provides a device for removing smoke, etc., which eliminates the above-mentioned drawbacks of conventional devices, causes less contamination of discharge electrodes, and has excellent dust collection performance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional device, and FIG. 2 is a diagram showing the distribution of discharge current on the counter electrode in the device of FIG. FIG. 3 is a sectional view of another conventional device, and FIG. 4 is a diagram showing the distribution of discharge current on the counter electrode in the device of FIG. 3. FIG. 5 is a sectional view of one embodiment of the present invention, and FIG. 7 is a perspective view thereof. FIG. 6 is a diagram showing the distribution of discharge current on the counter electrode in the device of FIG. 5. FIG. 8 is a perspective view of another embodiment of the present invention, and FIGS. 9, 10, and 11 are views showing other devices for explaining the present invention, respectively. 12th
13 are perspective views of one embodiment of the discharge electrode of the present invention. DESCRIPTION OF SYMBOLS 1... Electrode, 2... Channel, 3... Breathable counter electrode, 4... Corona discharge electrode, 5... Inflow side open end, 6... Outflow side open end, 7... Dust collection electrode, 8 …
...Corona shower, 9...Corona electrode (thin wire shape),
10... Corona electrode (fish bone shape), 11... Repulsion electrode, 12... Protruding end, 13... Substrate, 14... Corrugated thin wire, 15... Charging part, 16... Dust collection part, 17
...Clean air flow, 18...Dirty air flow, 19...
Electrode holding member, 20... Hollow member, 21... Inflow side opening, 22... Outflow side opening, 23... Electrode fitting, 24... Cylindrical body.

Claims (1)

[Claims] 1. A cylindrical body 2 forming a flow path 2 and having an electrode 1 on its inner surface.
4 is partitioned by one concave breathable electrode 3, the concave surface of the breathable electrode 3 faces the outflow side of the flow path 2, and one protruding end 12 in one direction is provided inside the cylindrical body 24. A device for removing smoke, etc., characterized in that the protruding end 12 of the corona discharge electrode 4 discharging in the air is opposed to the concave surface of the breathable electrode 3. 2. A patent characterized in that the cylindrical body 24 and the electrode 1 are respectively a cylinder and a cylindrical electrode, and the corona discharge electrode 4 is a needle-shaped discharge electrode with the protruding end 12 located at the center of the hemispherical breathable electrode 3. Claim 1
Smoke removal equipment as described in Section 1.