JPS6023002Y2 - smoke removal device - 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, it collects fine particles floating in the air by charging them with a corona discharge or the like. This invention relates to a device for removing smoke, etc., using a so-called electrostatic precipitator method in which smoke is collected on a dust electrode.

Generally, in conventional electrostatic precipitators that have a corona discharge electrode in the flow path, most of the discharge electrodes discharge in all directions around the discharge electrode, but such devices are When used to purify contaminated air containing a large amount of sticky and extremely fine suspended particles, the discharge current decreases significantly as the smoke concentration in the contaminated air increases, resulting in a decrease in dust collection effectiveness. had the disadvantage that it decreased more rapidly with the passage of time, and this is thought to be due to the following reasons.

Now, when we examine the distribution of corona current on the counter electrode in a conventional dust collector in which a thin wire-shaped discharge electrode is stretched in the flow path as shown in Figure 1a, we find that This shows that the discharge is widely distributed to the left and right of the electrode position, and is discharged in all directions, above, below, left and right of the electrode.

In addition, even in a conventional device in which a fishbone-shaped electrode is installed in the flow channel as shown in Figure 2a, the corona current distribution on the opposing electrode plate is widely distributed to the left and right of the electrode position, as shown in Figure 2S. This shows that discharge occurs in all directions around the electrode, similar to a thin wire electrode.

In general, when a high voltage is applied to a discharge electrode to cause a corona discharge, the generated corona ions rush towards the opposite electrode in a shower shape, accompanied by a so-called corona wind at a speed of about 10 times per second, so that the corona generation part of the discharge electrode A negative pressure area is generated in the vicinity, and air flows into the negative pressure area.

Therefore, when discharging in all directions surrounding the electrode, as in the conventional dust collector using the thin wire electrode or fishbone electrode mentioned above, the discharge occurs in all directions toward the negative pressure area near the discharge electrode. Moreover, the contaminated air in the flow path flows in against the corona wind and causes turbulence, so smoke particles are always present around the discharge electrode, and some of these smoke particles are caused by electrostatic charge. Due to induction, they adhere to the discharge electrode and contaminate it, reducing the dust collection effect over time.Other smoke particles receive radiation from the corona shower and are charged to the same polarity as the discharge electrode, moving toward the opposite electrode. However, the speed of charged particles is much slower than the speed of corona ions, so when there is a large amount of smoke, a cloud of charged particles generated around the discharge electrode interferes with the electric field between the discharge electrode and the counter electrode. It is thought that the shielding results in a decrease in the discharge current, which deteriorates the charging property of smoke particles and reduces the dust collection effect.

Therefore, in the conventional electrostatic precipitator, even if a plurality of discharge electrodes are provided in the flow path, the above-mentioned drawbacks are simply dispersed.

An object of the present invention is to provide a smoke removal device that eliminates the drawbacks of conventional devices and maintains excellent smoke removal effects over a long period of time.

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

FIG. 4 is a cross-sectional view of an embodiment of the present invention, and FIG. 5 is a perspective view thereof. As shown in these figures, the smoke removal device of the present invention is provided with an electrode plate 1 on the inner surface. A corona discharge electrode 4 is disposed inside the cylindrical channel 2, which discharges only at the protruding end 12 facing in one direction, and does not discharge at the tail end opposite to the protruding end 12.
A plurality of discharge electrodes 4 are arranged along the flow path 2 with the direction of each protruding end 12 parallel to the flow path 2.
The protruding end 12 of the second discharge electrode faces the non-discharging tail end of the first discharge electrode, and similarly for the third and subsequent discharge electrodes, each protruding end 12 faces the discharge electrode located in front of it. It has a structure that points towards the tail end of the body.

The flow path 2 accommodates the discharge electrode 4 and the electrode plate 1 and transports contaminated air such as smoke, and may have a rectangular cross section as shown in FIG. 5, but may have a rectangular cross section as shown in FIG. The flow path may be a cylindrical flow path or a flow path with a rectangular cross section, and the size of the cross section may be different in each part along the flow path, and the shape and number of the flow paths are not limited.

When the flow path 2 has a horizontally long cross section, such as a flow path with a rectangular cross section or an oval cross section, the discharge electrode 4 is a discharge electrode having a cutter-shaped end protruding in one direction as shown in FIG. It is possible to use an electrode or a saw blade-shaped discharge electrode having a plurality of protruding ends in one direction in a row, such as the discharge electrode shown in FIG.

Furthermore, instead of the sawtooth discharge electrode shown in FIG. 8, thin wires 14 may be attached in a waveform to one edge of the substrate 13 to provide a protruding end pointing in one direction, as shown in FIG.

When the flow path 2 is a cylindrical flow path, discharging electrodes discharging from the needle-shaped protruding end are provided along the axis of the flow path as shown in FIG. 7, so that the discharge within the flow path is uniform. The smoke removal effect can be further increased.

The electrode plate 1 may be a simple plate-shaped electrode provided along the inner wall of the flow path 2, or may be a mesh-shaped electrode plate or a tightly wound spiral electrode plate.

Furthermore, since the electrode plate 1 serves as a counter electrode for the corona discharge electrode 4 and also as a dust collection electrode, it is desirable that it be as absorbent as possible for smoke, and such an absorbent electrode may be made of a conductive sponge or the like. However, it can also be made by laminating various organic and inorganic absorbent materials and wire mesh.

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

FIG. 3a is a diagram explaining the action of the discharge electrode used in the present invention, and FIG.
FIG. 3 is a diagram showing the distribution of discharge current flowing through an electrode plate provided on the inner surface of a flow path.

Now, as shown in FIG. 3a, a corona discharge electrode 4 that discharges only at a protruding end 12 in one direction is placed inside a cylindrical channel 2 having an electrode plate 1 provided on its inner surface. When a high voltage is applied between the discharge electrode and the electrode plate to cause a corona discharge, the corona shower 8 generated from the protruding end is applied with a voltage of the same polarity as the corona ions. As shown in Figure 3, the corona wind 16 generated by the corona shower is radiated onto the electrode plate in a forward direction from the protruding end as shown in Figure 3, and the corona wind 16 generated by the corona shower is also repulsed by the discharge electrode body along with the corona ions. After the corona ions are emitted in a direction away from the electrode plate 1, most of them are emitted in front of the protruding end.

In this way, the air 11 flowing and settling in the negative pressure area generated near the protruding end of the discharge electrode due to the corona wind flows along the side of the discharge electrode from behind to the protruding end without resisting the corona wind at all. It will flow unilaterally.

Therefore, a plurality of such discharge electrodes 4 are provided inside the flow path 2 having the electrode plate 1 on the inner surface along the flow path, and the projecting ends 12 of these discharge electrodes are oriented in one direction. In the smoke removal device of the present invention, when a high voltage is applied between the discharge electrodes 4 and each electrode plate 1, the corona wind caused by the corona shower 8 generated from the protruding ends 12 of the discharge electrodes, as described above, is generated. As a result, the electric charge is radiated to the electrode plate 1, and while being discharged to the electrode plate 1, it flows toward the back of the discharge electrode located in front of the discharge electrode.

On the other hand, air flows into the negative pressure area generated near the protruding end of each discharge electrode from behind along the side surfaces of each discharge electrode. It is supplied from the corona wind of the discharge electrode located behind the discharge electrode.

In this way, air supplied from behind the empty discharge electrode plate is sequentially supplied to the protruding end of the discharge electrode located in front of the negative pressure portion generated near the protruding end of the discharge electrode located at the rearmost position. Therefore, no airflow is generated in any of the discharge electrodes that flows toward the discharge electrodes against the corona wind.

Next, the contaminated air 7 containing smoke, which has been introduced into the flow path of the smoke removal device of the present invention, is transferred to the protruding end 12 of the discharge electrode 4 as shown in FIGS. 4 and 5. When the contaminated air flow 7 reaches the front surface of the foremost discharge electrode located on the most inflow side of the flow path 2, the contaminated air flow 7 receives the corona wind caused by the corona shower of the discharge electrode The smoke particles are pushed near the plate 1, exposed to the corona shower, charged, and captured by the electrode plate, while moving in the flow path 2 along the electrode plate toward the outflow side.

In this way, the contaminated air stream 7 is successively exposed to corona showers from a plurality of discharge electrodes, so that smoke particles are eventually completely removed and discharged to the outside of the flow path 2.

Therefore, since the air flow supplied from behind the last discharge electrode to the protruding end of the electrode does not contain any smoke particles, it can be said that none of the plurality of discharge electrodes is affected by smoke particles. Not contaminated.

In addition, as mentioned above, since no air current flows into any of these multiple discharge electrodes against the corona wind,
Contaminated air flow 7 pushed towards electrode plate 1 by corona wind
Since the smoke particles always move in the flow path along the electrode plates, there are no smoke particles in the vicinity of any of the discharge electrodes.

Therefore, the charged smoke particles do not block the discharge electric field and reduce the discharge current, so even if the smoke concentration in the contaminated air increases, the smoke removal effect does not decrease.

6 and 7 are a cross-sectional view and a perspective view of another embodiment of the present invention. A plurality of corona discharge electrodes 4 that discharge only at the projecting ends 12 in the direction are provided along the flow path with their respective projecting ends facing the outflow side of the flow path, and the most corona discharge electrodes 4 are disposed at the inflow side open ends 5, 5. , a fresh air intake 17 is provided surrounding the nearest and last discharge electrode.

In this embodiment as well, the fresh air 11 supplied from the air intake port 17 to the rear of the last discharge electrode becomes a corona wind and is supplied to the rear of the discharge electrode located in front of the last discharge electrode. Since the discharge electrode is supplied behind the leading discharge electrode, there is no inflow of air against the corona wind at any discharge electrode, so the discharge electrode is not contaminated by smoke particles.

In addition, the contaminated air 7 introduced from the open ends 5, 5 on the inflow side of the flow path 2 is caused by a corona shower generated from the discharge electrodes located sequentially from the last discharge electrode to the front thereof, and one side of the accompanying corona wind. It always moves along the inner wall of the channel towards the outflow side.

Therefore, since smoke particles are not present near the discharge electrode, charged smoke particles do not interrupt the discharge electric field and reduce the discharge current.

In this way, in the present invention, the discharge electrode 4 may have its protruding end directed toward the outflow side of the flow path.

In the present invention, when the protruding end of the discharge electrode 4 is disposed toward the outflow side of the flow path, the embodiments shown in FIGS. 6 and 7 are necessary to supply fresh air to the discharge electrode located at the rear end Although an air intake port 17 may be provided surrounding the electrode as shown in FIG. 10, an air intake port 17 may be provided surrounding the electrode, but as shown in FIG. If another discharge electrode 15 with its end facing the inflow side is provided at a distance sufficient to prevent both corona showers from interfering with each other, the air supplied to the last discharge electrode will flow between these electrodes. The air is supplied from the upper part of the contaminated air flow 7 flowing along the flow path, but since the air flow in the upper part of the contaminated air flow 7 contains almost no smoke particles, the discharge electrode is contaminated. Never.

The plurality of discharge electrodes in the present invention may be connected to the same high-voltage power source, but they may also be connected to power sources with different voltages to control the discharge current according to the smoke concentration in the contaminated air.

Further, the operation of these plurality of discharge electrodes may be arbitrarily and manually or automatically interrupted as necessary.

As explained above, when using the present invention, contaminated air does not flow into the vicinity of the discharge electrode, so the discharge electrode is not contaminated by smoke particles, and since the discharge electric field is not shielded by charged particles, smoke The smoke removal effect does not decrease even if the concentration increases, and the effect does not decrease even during long-term operation.

Furthermore, in the present invention, the fresh air supplied to the discharge electrode located at the end is sequentially supplied to the discharge electrodes located in front of it, so that contamination of the electrodes can be prevented even though there are multiple discharge electrodes. The method can be made extremely simple.

[Brief explanation of the drawing]

Figures 1a and b are sectional views of a conventional device and diagrams showing discharge current distribution on the electrode plate of the device, and Figures 2a and b are similarly sectional views of another conventional device and the device. FIG. 3 is a diagram showing the distribution of group N current on the electrode plate of FIG. FIGS. 3a and 3b are views for explaining the action of the corona discharge electrode used in the present invention, and FIGS. 4 and 5 are a sectional view and a perspective view of one embodiment of the present invention. 6 and 7 are a sectional view and a perspective view of another embodiment of the present invention, and FIGS. 8 and 9 are perspective views of an embodiment of the discharge electrode of the present invention. FIG. 10 is a sectional view of still another embodiment of the present invention. 1... Electrode plate, 2... Cylindrical channel, 3...
... Repulsion electrode, 4 ... Corona discharge electrode,
5... Inflow side open end, 6... Outflow side open end, 7... Contaminated air flow, 8... Corona shower, 9...・Corona 'I pole (thin line),
10...Corona electrode (fish bone shape), 11...Curved fresh air flow, 12...Protruding end, 13...
Substrate, 14... Corrugated thin wire, 15... Discharge electrode, 16... Corona wind, 17...
Air intake port, 18... Dust collection electrode, 19...
...High voltage terminal.

Claims (5)

[Scope of utility model registration request] (1) A plurality of corona discharge electrodes 4 that discharge at the protruding end 12 in one direction and do not discharge at the tail end opposite to the protruding end 12 are installed inside the cylindrical channel 2 having the electrode plate 1 on the inner surface. The direction of each protruding end 12 is arranged parallel to the flow path 2 along the flow path 2, and the second and subsequent discharge electrodes among the plurality of discharge electrodes 4 have their projecting ends 12 aligned with the discharge electrode. A smoke removal device, characterized in that it is directed towards the tail end of the discharge electrode located in front of the electrode. (2) The smoke removal device according to claim 1, wherein the projecting ends of the plurality of discharge electrodes 4 all face the inflow side of the flow path 2. (3) The smoke removal device according to claim 1, wherein the projecting ends of the plurality of discharge electrodes 4 all face the outflow side of the flow path 2. (4) Among the claims 1 to 3, the flow path 2 is a cylindrical flow path, and the discharge electrode 4 is a needle electrode arranged along the axis of the flow path. The smoke removal device according to any one of the items above. (5) The flow path 2 is a flow path with a horizontally long cross section, and the discharge electrode 4 is a discharge electrode that discharges from a protruding end facing in one direction in the shape of a blade or a saw blade. The smoke removal device according to any one of Item 3.