JPH0440249A - Waste gas cleaning apparatus - Google Patents

Abstract

PURPOSE:To clean waste gas for a long duration by installing an ablative corona generating part consisting of a high voltage electric power source to be connected with a first electrode and a second electrode and an injecting means to inject a cleaning liquid to the plane in the first electrode side of the ablative corona generating part and a sucking means to suck the open air to the ablative corona generating part. CONSTITUTION:Waste gas sucked to an upper duct 13 by operation of a sucking means 18 passes the insides of a plurality of ablative corona generating parts 6. In the inside of an ablative corona generating part 6, ablative coronas C1 flock and make lines and the whole of the waste gas passes the ablative coronas C1. Harmful gas is removed from the waste gas by ozone, ion wind, etc. generated in the ablative corona generating part 6. The waste gas which passes the ablative corona generating part 6 is thus cleaned and reaches a lower duct 14 and is discharged outside. Meanwhile, as cleaning liquid 5 is dropped to the ablative corona generating part 6. The cleaning liquid 5 dropped to the ablative corona generating part 6 receives Coulomb's force and is diffused and adsorbed on the surface of an insulating part 3. Consequently, harmful gas in the waste gas is surely removed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the prevention of corona-generating parts that can be generated as exhaust gas on roads congested with traffic, toll gates on toll roads, inside tunnels, factories, etc. The exhaust gas purification system was installed.

[Prior Art] Conventionally, this type of technology has been disclosed in Japanese Patent Application Laid-Open No. 57-20510. According to the conventional technology, the cylindrical dust collecting cylinder is formed into a corrugated shape, and a desired number of discharge wires are stretched in the hollow part of the cylindrical dust collecting cylinder, and a high voltage is applied to the discharge wires. was applied to remove fine particles such as tar particles and graphite from the exhaust gas. In other words, it is necessary to eliminate the influence of the strong electrostatic field generated between the cylindrical dust collection tube and the discharge wire on the generation of child corona, and the dust is removed. .

[Problems to be Solved by the Invention] However, according to the above-described conventional technology, there was a risk that the discharge wire would break when a spark discharge occurred between the dust collection tube and the discharge wire.

Furthermore, the purification ability was weak and insufficient for removing harmful gases such as NOx and CO8 from exhaust gas.

Recently, corona discharge has been considered to be an effective form of discharge generation to activate and eliminate such harmful gases.
- The desired value could not be secured for the corona discharge phenomenon within the film.

Therefore, in order to put into practical use the technology for removing harmful gases by means of corona discharge, it was necessary to generate a unique corona, that is, a blower corona, and it was necessary to ensure an increase in the number of blower coronas.

Furthermore, in order to generate the blower corona stably for a long time,
For example, the above-mentioned removal due to adhesion of carbonized particles, etc.

[Means for Solving the Problems] The present invention was created in view of the above-mentioned problems, and includes a first electrode made of a conductor having a convex portion on its surface, and a first electrode facing the first electrode. a second electrode made of a conductor disposed;
an insulating part that adheres to at least the surface of the second electrode on the first electrode side; and a blade corona generating section comprising a high voltage power source connected to the first electrode and the second electrode; An exhaust gas purification device is provided, comprising: injection means for injecting a cleaning liquid into a first electrode side surface of the part; and suction means for sucking outside air into the blower corona generation part.

Further, as an embodiment of the exhaust gas purification device, the injection means has a cylindrical shape and includes at least one slit through which the cleaning liquid flows, and is attached to the upper end of the blower corona generating part. Provide equipment.

The object of the present invention is to stably maintain and generate a sweeper corona using the above-mentioned constituent means, and to purify exhaust gas over a long period of time by the sweeper corona.

[Function] The exhaust gas purification device according to the present invention having the above-mentioned configuration functions as follows.

First, in the part where the blower corona occurs, the first electrode and the second
When a high voltage is applied between the electrodes, a brush corona is generated between the first electrode and the insulating portion attached to the inner surface of the second electrode.

This state is shown in FIGS. 6-7 and will be explained below.

FIG. 5 shows a state in which a positive voltage is applied to the first electrode l and a negative voltage is applied to the second electrode 2 by the high voltage side 1, respectively.

The arrow indicated by EO in FIG. Indicates the direction of the reverse electric field caused by the charges accumulated on the surface of the insulating section 3, P indicates the positive charge accumulated on the surface of the insulating section 3, and CI indicates the positive polarity corona. Showing a grown Otsuko corona.

In the state l shown in FIG. 6, the blade corona CI is generated and positive charges P are accumulated on the surface of the insulating part 3, and the reverse electric field ES increases in accordance with the amount of the positive charge P, causing the blade corona CI to increase. Suppression and over time, Otsuko Corona C
I changes into a brush corona or glue-like corona that occurs only in the vicinity of the first electrode 1 and attenuates.

This phenomenon of attenuation of change in the brush corona CI is ultimately caused by the positive voltage B
It occurs because too much P accumulates,
By taking measures to reduce this excess positive charge P, the blade corona CI increases and grows.

In this invention, generation of the blade corona C1 is ensured by neutralizing and reducing excess positive charge P through the steps shown in FIGS. 6 and 7, which will be described later.

FIG. 6 shows a so-called zero point state where the polarity of the output of the high voltage side 1 is switched. In the state shown in FIG. 6, l is temporarily stopped during the occurrence of corona.

FIG. 7 shows the 5th v! The polarity is opposite to the state shown in J, and a negative voltage is applied to the first electrode l by the high voltage side 1.
A state in which a positive voltage is applied to each of the second electrodes 2 is shown.

In FIG. 7, e represents an electron, and C2 represents a negative corona.

In the state shown in FIG. 7, a negative corona C2 and electrons e are generated from the first electrode 1, and the electrons e combine with the positive charge P accumulated on the surface of the insulating section 3 to be neutralized.

As a result, the excessive positive charge P is reduced, and when the state shown in FIG. 5 is reached again, the blade corona CI is generated again.

As mentioned above, in the area where Oshiko corona occurs, Figures 5 to 7
A brush corona C1 is continuously generated by repeating the state shown in the figure, but if carbonized particles etc. adhere to the insulating portion 3 and unevenness occurs on the surface of the insulating portion 30, the brush corona C1 disappears and spark discharge occurs. and transition. However, in this invention, the cleaning liquid 5 is injected into the blower corona generating part 6 by the injection means, and the deposits on the surface of the insulating part 30 are constantly cleaned by the cleaning liquid 5. Therefore, in the case of generation g6 of the blower corona, the blower corona C1 is stably generated for a long period of time.

Then, when the exhaust gas is vented to the blower corona generating section 6 by the suction means, NOo in the exhaust gas is released.

so,,co. Harmful gases such as the above are oxidized by O3 (ozone) generated by the blower corona and changed into stable gases, or are cleaned by being adsorbed by the blower corona generating part 6 by ion wind.

[Embodiment] Figures 1 to 4 are drawings showing preferred embodiments of the present invention.

This embodiment is configured to purify harmful gases in exhaust gas generated at toll gates on toll roads as shown in Fig. 3, in tunnels as shown in Fig. 4, on roads congested with traffic, and in factories. An example will be described.

No. 1111 is a vertical sectional view showing the entire exhaust gas purification device 1A according to the present invention.

In the figure, reference numeral 6 denotes a blower corona generating part that generates a blower corona CI when the high-voltage power supply 4 is applied, and the first electrode! , second electrode 2, insulating section 3, high voltage side 1, and support section 7
It is structured according to the following.

To explain in detail, the first electrode 1 is made of, for example, a stainless steel hakama which has been spirally processed like a screw.

You may select an appropriate method. By changing the pitch of the threads, a convex portion having a triangular cross-sectional shape or a convex portion having a trapezoidal cross-sectional shape on the surface of the first electrode 1 is formed.

Next, the first electrode 1 is supported by a support part 7 made of an insulating material at the center of a cylindrical insulating part 3 made of a material such as ceramics.

Then, the second electrode 2 is formed on the outside of the insulating part 3.

The second electrode 2 has an insulating part 3 made of ceramic or the like, for example.
It is formed by printing a metal paste on the surface and firing it. Alternatively, the second electrode 2 is prepared in advance using a metal vibrator, and then the surface of the second electrode is enamel-processed using organic glass or the like to form a permanent electrode. Further, a combination of an insulated vibrator and a metal vibrator may be used.

The first electrode 1 and the second electrode 2 are connected to the high voltage side 1, respectively.
It is electrically connected to. The high voltage N source 4 is a circuit that generates high voltage of both positive and negative polarities at a predetermined frequency, and its waveform may be any one of a sine wave, a pulse wave, etc.

5 is a cleaning liquid. The cleaning agent 5 may be any material suitable for cleaning the insulating portion 3 of the wiper corona generating portion 6, for example, engine oil, light oil, etc. can be used.

Next, 8 is an injection means. The injection means 8 is for injecting the cleaning liquid 5 into the surface of the insulating section 3 on the first electrode l side, and has a shape shown in FIG. 2. That is, the injection means 8 has a cage shape as shown in FIG. 2, and is provided with a plurality of slits 8a in the upper part through which the cleaning liquid 5 flows. Inside the injection means 8, there is a first opening facing upward.
It has a seeding pot part 8b, a second seeding pot part 8C opening downward, and a cylindrical part 8d communicating between the second bowl part 8c and the first bowl part 8b. Further, the outside of the injection means 8 has a stepped portion 8e, a groove portion 8g for mounting an O-ring 8f, and a threaded portion 8h.

Further, 9 is a receiving part for the cleaning liquid 5;
A cap 10 for discharging the sediment 5b at the bottom of the receiving part 9 is screwed on.

The receiving portion 9 further includes a circulation vibrator 1 connected to the pump 11.
2 are connected.

The circulation vibrator 12 is a vibrator that connects the receiving part 9 and the upper duct 13 via the pump 11, and the distal end +2a connected to the receiving part 9 is located at a higher position than the bottom part 9a of the receiving part 9. This eliminates the suction of the precipitate 5b.

Further, the receiving portion 9 includes a collision plate 9b that separates mist such as the cleaning liquid 5 contained in the exhaust gas.

The receiving portion 9 is connected to a lower duct 14 which is an exhaust gas passage.

Further, the lower duct 14 works together with the upper duct 13 provided at an opposing position to sandwich the brush corona generating section 6.

To be more specific, the lower part of the brush corona generating part 6 is in pressure contact with the lower duct 14 via a backing 15a made of silicone rubber, and the upper part is also in pressure contact with the upper duct 13 via a backing 5b. Incidentally, the upper duct 13 carries the cleaning liquid 5.
It also serves as a tank to store water.

In addition, in the lower duct 14 and upper duct 130 questions,
Earth plate 1 inserted through a plurality of blower corona generating parts 6
6 is provided.

The earth plate 16 is connected to the second
This is a member for grounding the electrode 2 along with one end side of the high voltage side 1, and the ground plate 16 is a member for grounding the electrode 2 of the contact member +7.
It is electrically connected to the second electrode 2 via. The contact member 17 is a member formed into a substantially U-shape and made of a metal material such as a beryllium-copper alloy material.
The remover corona generating part 6 can be easily removed and installed.

1 day is by inhalation means. The suction means 18 is for sucking outside air into the blower corona generating section 6, and is for sucking outside air into the lower duct 1.
It is set at 4.

In this embodiment, the suction means 18 is constituted by a fan. Incidentally, the suction means +8 may be arranged at the frontage of the upper duct 13.

Next, the operation of the exhaust gas purification device having the above-mentioned configurations will be explained with reference to FIG. 1.

For example, the exhaust gas sucked into the upper duct +3 as shown by arrow B by the operation of the suction means 18 passes through the plurality of blower corona generating parts 6 as shown by arrow C. At this time, the blade coronas CI are lined up in groups inside the blade corona generating section 6 due to the discharge phenomenon, and all the exhaust gas passes through the atmosphere of the blade coronas C1.

Although the exhaust gas contains harmful gases such as nitrogen compounds (No. 2), these harmful gases are removed from the exhaust gas by ozone, ionic wind, etc. generated within the rotor corona generating section 6.

Then, the exhaust gas that has passed through the brush corona generating section 6 is cleaned, reaches the lower duct 14 as shown by the arrow, and is discharged to the outside through the receiving section 9 as shown by the arrows E and F.

On the other hand, the #purified liquid 5 is stored in the upper duct 13 and passes through the slit 8 & of the injection means 8 to generate the corona 118.
6.

The cleaning S liquid 5 dripped into the wiper corona generating part 6 is diffused and adsorbed onto the surface of the insulating part 3 by the Coulomb force or by the ionic wind between the two electrodes where the wiper corona C1 is generated.

As a result, the surface of the insulating portion 3 is constantly cleaned and smoothed by the cleaning liquid 5.

Then, the cleaning liquid 5 flowing out from the blower corona generating part 6
reaches the receiving part 9 via the lower duct 14. At this time, a part of the cleaning liquid 5 is contained in the exhaust gas as a mist.
This mist collides with the collision plate 9b provided in the receiving part 9,
It is stalled and collected into the receiving part 9. Thereby, the cleaning liquid 5 can be used effectively.

The cleaning liquid 5 stagnant in the receiving part 9 is pumped up by the pump 11 into the upper duct 3 and is again injected into the blower corona generating part 6.

[Effects of the Invention] The present invention provides a cleaning layer 1 on the first electrode side surface of the insulating section of the blower corona generating section constituting the exhaust gas purification device. Unevenness caused by deposits can be cleaned with the cleaning liquid, and therefore, a large scale corona discharge can be stably maintained and generated across Nagato, reducing tolls on roads congested with traffic and toll roads. It is possible to reliably remove harmful gases from exhaust gas generated at places, tunnels, factories, etc.

Furthermore, since the injection means includes at least one slit through which the cleaning liquid flows, an excellent effect is achieved in that a small and appropriate amount of the cleaning liquid can be injected into the blower corona generating area.

[Brief explanation of drawings]

1 is a vertical sectional view of a preferred embodiment of the present invention, FIG. 2 is a perspective view of the injection means shown in FIG. 1, and FIG. 3 is a perspective view of a toll plaza in which the injection means shown in FIG. Figure 4 shows what is shown in Figure 1! 51 is a perspective view of the inside of the tunnel. 5 to 7 are schematic diagrams for explaining the corona generation state of the present invention, FIG. 5 is a diagram showing a positive polarity corona generation state, FIG. 6 is a diagram showing a zero point state, 117
The figures are diagrams each showing the state of occurrence of negative polarity corona. l...first electrode, 2...second! Pole, 3... Insulating part, 4... High voltage power supply, 5... Cleaning liquid, 6... Brush corona generation part, 7... Support part, 8... Injection means,
9... Receiving part, 1o... Cap, ■... Pump,
12...Circulation pipe, 13...Upper duct, 14.
...Lower duct, 16...Earth plate, 17...
・Contact member, 18...More than half-capture means Fig. 2

Claims (2)

[Claims] (1) a first electrode made of a conductor having a convex portion on its surface;
a second electrode made of a conductor disposed opposite to the first electrode; an insulating portion attached to at least a surface of the second electrode on the first electrode side; a blower corona generating section consisting of a high-voltage power supply connected to the second electrode, an injection means for injecting a cleaning liquid into the first electrode side surface of the blower corona generating section, and a suction means for sucking outside air into the blower corona generating section. An exhaust gas purification device characterized by having the following. (2) the injection means has a cylindrical shape and includes at least one slit through which the cleaning liquid flows;
The exhaust gas purification device according to claim 1, wherein the exhaust gas purification device is attached to the upper end of the blower corona generating section.