JPS6133626B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic precipitator, and more specifically, the present invention relates to an electrostatic precipitator, and more specifically, a large amount of gas to be treated containing suspended fine particles is passed through an electrostatic precipitator area to collect the fine particles in the electrostatic precipitator area. The coarse particles are collected on the dust collection electrode, and are smoothly transported out of the system in the form of aggregated coarse particles with a concentration higher than that of the gas to be treated. The present invention relates to a device that can perform various operations such as collecting dust and discharging dust efficiently in a relatively small space by providing sufficient mechanical dust collection.

The device of the present invention handles gas containing fine particles at a dilute concentration with a large air volume, like the air dust collection operation in road tunnels, and also installs the dust collection area in a narrow space to collect dust. This is particularly useful in applications where the dispensing operations associated with such dispensing operations must be performed.

In road tunnels, polluted air containing particulate matter such as carbon emitted as vehicles travel accumulates, and it goes without saying that such polluted air has undesirable effects on human health. In addition, the suspended particulate matter causes various inconveniences such as poor visibility inside the tunnel or deposits on lighting equipment and the like, reducing the efficiency of lighting.

However, dust collection operations for the air in tunnels are difficult because suspended particles in the air are minute and extremely dilute, a large amount of gas must be handled, and the installation space for dust collectors is limited. Many difficulties are encountered due to reasons such as being confined to a very narrow space.

For example, excessive dust collection methods such as back filters have the advantage of requiring a relatively small installation space, but they also have low collection efficiency for fine particles, have a large pressure loss, and require a large amount of air to be processed. Obviously not suitable for gases. On the other hand, the electrostatic precipitator method has the advantages of high collection efficiency for fine particles and relatively low pressure loss, making it suitable for handling large air volumes of gas. It is not always easy to remove the dust (hereinafter also referred to as dust), and it also has drawbacks such as requiring a large installation space.

In other words, in the electrostatic precipitator method, if the layer of dust on the precipitate electrode becomes thick, it will cause electrical problems such as back corona phenomenon and problems such as a decrease in dust collection efficiency. Although it is necessary to discharge the dust to the outside, this operation of discharging the dust is not necessarily easy. For this purpose, in conventional commercial electrostatic precipitators, a large-capacity hopper is installed below the dust collection area, and the dust on the dust collection electrode is brushed off into the hopper by some means, and the dust is stored in the hopper. The dust is taken out directly from the lower discharge port, or conveyance and discharge means are used such as a conveyor or a conveying air current (see, for example, the specification of Japanese Patent No. 124181).

However, in such a discharge mechanism, the ratio of the space effective for dust collection operation to the space of the entire device, that is, the space factor, is very small, and the dust accumulated in the hopper may cause a bridging phenomenon. Troubles such as poor discharge of dust collection are likely to occur.
Furthermore, there are still structural problems that need to be improved, such as the need to install a heavy electrostatic precipitator body above the hopper.

The present inventors conducted an operation to collect suspended particulates in a gas onto a dust collecting electrode in an electrostatic precipitating area, and simultaneously blew off the collected dust by blowing a fluctuating flow of compressed air onto the dust collecting electrode. The aggregated coarse particles that are brushed off are redispersed in a concentrated form into the laminar carrier airflow that flows directly below the electrostatic precipitator area, and are then discharged outside the electrostatic precipitator area. It has been found that when mechanical dust collection is combined with the operation of separating aggregated coarse particles from the conveying air stream, fine particles can be efficiently collected and discharged within a relatively small space. .

The purpose of the present invention is to efficiently collect dust from a large volume of gas containing suspended fine particles at a dilute concentration, to blow off and blow out dust from an electrostatic collection area, and to collect dust efficiently in a narrow space. The object of the present invention is to provide an electrostatic precipitator that can be used in a short period of time.

Another object of the present invention is to provide an electrostatic precipitator that has a ratio of space effective for dust collection operations per space of the entire device, that is, a space factor that is significantly higher than that of known electrostatic precipitators. It is in.

Still another object of the present invention is to provide an electrostatic precipitator that can perform stable and continuous dust collection operations without causing problems such as poor dust discharge.

Still another object of the present invention is to efficiently blow off the collected dust by blowing compressed air as a fluctuating flow onto the surface of the dust collecting electrode, and at the same time, to form the dust that has been blown off directly under the electrostatic precipitate area. An object of the present invention is to provide an electrostatic precipitator in which collected dust can be smoothly discharged outside the device in a short period of time by being carried in a laminar carrier air flow and being discharged outside the device.

Yet another object of the invention is to provide an electrostatic precipitator particularly suitable for dust collection operations in tunnels.

According to the present invention, an electric dust collection area equipped with a dust collection electrode and a counter electrode, a dust transport area located below the dust collection area and directly communicating therewith, and an inlet and an outlet of the dust collection area that are opened during a dust collection operation and An opening/closing mechanism for closing these during dust transport, a dry dust removal mechanism for brushing off the dust adhering to the dust collection electrodes into the dust transport area, and a dry dust removal mechanism for supplying a transport airflow to the dust transport area and dispersing the dust. In an electrostatic precipitator comprising an air blowing/exhausting mechanism for discharging or suctioning dust out of a dust conveying area in a shape, and a mechanical dust collecting area provided on the exhausting or suction side of the air blowing/exhausting mechanism, the dry dust removal method The mechanism includes an injection nozzle that injects compressed air for brushing off dust adhering to the dust collection electrode surface, and a mechanism that moves the injection nozzle in parallel from side to side and oscillates up and down. has substantially the same installation area as the electrostatic precipitator area, and is configured to form a layered dust conveying airflow in a constant direction over the entire area of the dust conveying area during dust discharge. An electrostatic precipitator is characterized in that the dust collected by blowing compressed air is carried by the dust conveying airflow of the dust conveying zone and discharged to the mechanical dust collecting zone. provided.

Although the device of the present invention is applicable to any gas containing suspended fine particles, such suspended particles can be removed by dry blowing off the dust collection electrode using compressed air, and their redispersion. passing things through, centrifuging,
In connection with application to mechanical dust collection, such as inertia, it is necessary to be non-stick, ie solid, under these operating conditions. Of course, even if these suspended fine particles contain sticky components such as tar,
As long as the collected dust is kept in a non-stick state as a whole, it can be applied to the treatment of the present invention. There are no particular restrictions on the type of fine particles, and they can range from conductive ones such as carbon contained in automobile exhaust gas to relatively low conductive ones such as ash and inorganic oxides. It may be something like that.

Although there is no particular restriction on the particle size of the suspended fine particles, it is an advantage of the present invention that even fine particles having a particle size of less than 1 micron (μ) can be easily removed from a high-speed airflow. Although the concentration of suspended fine particles contained in the gas to be treated may vary over a wide range, the apparatus of the present invention is suitable for use when the dust concentration is between 0.1 and 10 mg/m ³ , such as automobile exhaust gas filling a tunnel. It can also be effectively used to treat relatively dilute gases such as.

As the electrostatic precipitator area, any electrostatic precipitator mechanism known per se, consisting of a precipitator electrode and a counter electrode, can be used. In order to process a large amount of gas to be treated in an electrostatic precipitator area with a relatively small space, it is generally necessary to reduce the pressure loss in the electrostatic precipitator area and to allow the gas to pass through at high speed. From this point of view, it is desirable that the pair of the dust collection electrode and the counter electrode extend in the direction of movement of the gas to be treated to form an electrical dust collection passage. In general, it is effective to separate and collect fine particles from high-speed airflow by alternately providing a plurality of dust collection electrodes and counter electrodes to form a large number of electrostatic collection passages in the direction of gas movement. It is suitable for

The dust collecting electrode may be an ordinary plate-shaped electrode, but if desired, a porous metal member such as a wire mesh or metal lath may also be used. As the counter electrode, a corona wire, other sharpened electrode, rod-shaped electrode, plate-shaped electrode, or a combination thereof can be used.

It is possible to simultaneously charge and collect suspended fine particles in the electrostatic precipitator passage, or to charge the particles on the upstream side of the electrostatic precipitator passage and collect only the charged particles in the electrostatic precipitator passage. You can also make it happen. In the former case, the counter electrode may be an electrode with corona-generating ability such as a corona wire or a sharpened electrode, or a combination of an electrode with corona-generating ability and an electrode without corona-generating ability such as a rod-like electrode or a plate-like electrode. used. In the latter case, an electrode capable of generating corona, that is, a charged electrode, or a pair of a charged electrode and a ground electrode (for example, a wire mesh) is provided on the upstream side of the electrostatic precipitator passage, and as a counter electrode of the electrostatic precipitate passage. Use electrodes that do not have the ability to generate corona.

Although the gap between the counter electrode and the collection electrode can be varied, a gap of about 5 to 60 mm (hereinafter sometimes referred to as a narrow interelectrode dust passage) is particularly suitable. However, this gap is of course 60mm.
It is also possible to expand beyond this. Although the length of the electrostatic precipitate passage can be varied, a range of 10 cm to 500 cm is sufficient in the case of the narrow inter-electrode dust collection passage described above.

The voltage applied between the counter electrode and the collection electrode differs depending on whether only collection is targeted, or both charging and collection are targeted, or depending on the distance between the two electrodes. However, it is preferable to choose an appropriate voltage such that the average potential gradient is generally in the range of 1.5 to 12 kV/cm.

In the present invention, the flow velocity of the gas to be treated leading into the electrostatic precipitator region can be varied over a wide range, but when using the narrow inter-electrode dust collection passage described above, the linear flow velocity of the gas to be treated can be set to 3 m/sec or more. At high speed, floating fine particles can be collected effectively.

An important feature of the present invention is that fine particles are collected by supplying a large volume of the gas to be treated to an electrostatic precipitator area with low pressure loss, while the fine particles are blown away from the electrodes by blowing a fluctuating flow of compressed air. At the same time as the dust removal operation, the particles are swept away by a small air volume laminar conveying airflow that is formed in the entire lower part of the electrostatic precipitator area,
It consists in applying mechanical dust collection such as inertia.

That is, the fine particles deposited on the collection electrode are
The particles are aggregated and coarsened, and are blown off from above the collection electrode by the fluctuating flow of compressed air, and then transferred to a mechanical dust collection area such as a dust collection area by a laminar conveying air flow with a small air volume formed over the entire area below. As a result, the collected dust can be effectively discharged and collected using attached equipment with high collection efficiency and relatively small volume. Thus, according to the present invention, the above-mentioned space factor is significantly higher than that of the known electrostatic precipitator method, making it possible to install the device in a limited narrow space, and furthermore, it is possible to dispose of the collected dust and It also becomes possible to further facilitate the collection operation.

Therefore, according to the present invention, as a dry-type dust removal mechanism for dust adhering to the collection electrode, there is provided an injection nozzle that injects compressed air for removing the adhering dust onto the collection electrode surface, and the injection nozzle is arranged in parallel to the left and right. We adopted a device equipped with a mechanism that allows it to be moved and also to oscillate up and down. In other words, by adopting these mechanisms, the injection of compressed air onto the surface of the collection electrode is performed as a fluctuating flow, so that not only is the injection of compressed air evenly distributed over the surface of the collection electrode, but also the injection of air is Since the dust is sequentially removed from the area where the dust has been removed, it is possible to stably and smoothly continue removing the dust and discharging the dust with a small amount of air.

Further, according to the present invention, a dust transport area is provided below the electrostatic precipitator area and is in direct communication with the electrostatic precipitator area and has substantially the same installation area as the electrostatic precipitator area. A layered dust transporting airflow flowing in a fixed direction is formed, and this transporting airflow is communicated with another mechanical dust collection area outside the electrostatic dust collection area. In other words, the dust that is brushed off from the collection electrode is immediately discharged to the mechanical dust collection area without being stored in the main body of the device, and because it forms a layered and unidirectional conveying airflow, there is relatively little dust. This makes it possible to smoothly discharge dust by using a conveying air flow with a large amount of air.

Furthermore, in the present invention, the above-mentioned dust removal is simultaneously performed and the dust thus removed is discharged outside the electrostatic precipitating area. In other words, this eliminates the need to install a large-capacity hopper, and increases the ratio of the space effective for dust collection operations to the space of the entire device, that is, the space factor, to a significantly larger value compared to conventional ones. This makes it possible to use it for dust collection in tunnels, where installation volume is severely limited.

In the present invention, the blowing of compressed air can be carried out by a method known per se, for example, by using an air compressor, blower, fan, etc.

When removing collected dust, it is especially important to remove the dust in a dry state.When removing collected dust in the form of a slurry using a water film or water jet, transportation of this slurry is particularly important. This creates many problems in collecting dust from the slurry.

The dimensions of the dust transport area are sufficient as long as they have an area corresponding to the electrostatic precipitate area and a height that allows the dust to be brushed off to be carried on the transport airflow and moved. Its installation size is extremely small compared to . If desired, a porous member such as punched metal or wire mesh may be provided between the electrostatic precipitate collection area and the dust transport area.

In particular, according to the present invention, a low height is sufficient for the dust transport area, and the exhaust port for the dust-containing transport gas can be installed in the horizontal direction. Another notable advantage is that the dust can be stacked on top of each other so that space can be used without wasting space, and that there is almost no dead space compared to conventional dust ejection mechanisms such as hoppers.

According to the present invention, the dust to be brushed off is dispersed in a conveying air stream to form a dispersion (suspended gas) containing this dust at a concentration higher than that of the above-mentioned gas to be treated, and this dispersion is Transfer to mechanical dust collection area.

For this purpose, a supply port for the carrier gas is provided on one side of the dust transfer area and a discharge port for the dispersion gas is provided on the other side.

In order to prevent the dust from scattering outside the electrostatic precipitator area and the inflow of excess air when dust is removed and the removed dust is transported by airflow,
An opening/closing mechanism is provided at the inlet and outlet of the electrostatic precipitating area, and these opening/closing mechanisms are closed during the dusting operation and air flow conveyance operation.

The dust concentration in the carrier gas can be varied in various ways, but it is generally desirable to have it in the range of several times to several thousand times the concentration in the gas to be treated from the standpoint of efficiency and space reduction. It is advisable to supply the necessary carrier gas to maintain the

In order to supply the carrier gas to the dust transport area, there is a method of pumping the carrier gas from the supply port, sucking the dust dispersion transport gas from the discharge port, and supplying a corresponding amount of transport gas from the supply port to the dust transport area. Any method of ventilation may be adopted. In the case of a pressure feeding type, a slit-shaped or other shaped nozzle may be used as the supply port.

According to the present invention, the dust thus brushed off from the collection electrode is carried on the carrier gas and quickly guided to the mechanical dust collection area, and the dust dust is removed and separated and collected in an extremely short time. It is also one of the advantages of the present invention. As the mechanical dust collection area, excessive dust collection such as a bag filter, centrifugal dust collection such as a cyclone, mechanical centrifugal dust collector, inertial dust collection such as a louver dust collector, or a combination thereof can be used. In any of these cases, dust can be efficiently removed in a relatively small space due to the fact that the dust has aggregated to a sufficiently large size, and the dust concentration is high and the air volume is accordingly small. can be separated and recovered.

Further, according to the present invention, the time required for dust removal and discharging is significantly shorter than the time required to perform an electrostatic precipitator operation. It will also be understood that in the case of a carbonaceous material such as, the idle time of the device is extremely short, with the former being 12 to 48 hours, while the latter is 1 to 3 minutes.

According to the present invention, in connection with the fact that the electrostatic precipitate operation and the dust removal and discharging operations are performed alternately, a plurality of electrostatic precipitate areas are provided, and the dust is collected in one dust collection area. When performing the dust dust removal and discharging operations, it is preferable to perform the electrostatic precipitating operation in another electrostatic precipitating area.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 is a partial systematic explanatory diagram of an electrostatic precipitator that is most suitable for treating dust (mainly solid carbon and ash) discharged from automobiles (not shown) running in tunnels (not shown). The features of the device include a dust collection area 3 equipped with a dust collection electrode 1 and a counter electrode 2;
A dust conveyance area 4 located below and directly communicating with the dust collection area 3, and an opening/closing mechanism for opening the inlet 5 and outlet 6 of the dust collection area 3 during dust collection operation and closing them during dust conveyance. Mechanisms 7a and 7b, a dry dust removal mechanism 8 for blowing off the dust adhering on the dust collection electrode 1 to the dust transport area 4, and a dry dust removal mechanism 8 for supplying a transport airflow to the dust transport area 4 and dispersing the dust. In an electrostatic precipitator comprising an air blowing/discharging mechanism 9 for discharging dust outside the dust conveying area 4 in the form of Brushing mechanism 8
is equipped with an injection nozzle 16 for injecting compressed air for removing adhering dust to the dust collecting electrode 1 and counter electrode 2, and mechanisms 27 and 36 for moving the injection nozzle 16 in parallel from side to side and swinging it up and down. Ori,
Further, the dust transport area 4 has substantially the same installation area as the electrostatic precipitator area 3, and when discharging dust, there is a layered dust transport airflow in a constant direction over the entire area of the dust transport area 4. is formed, and the dust that is blown off by the blowing of compressed air is carried by the dust transport airflow of the dust transport area 4 and is discharged to the mechanical dust collection area 10. There is a particular thing.

Usually, the dust collecting electrode 1 and the counter electrode 2 have a diameter of 10 to 80
A plurality of them are arranged in parallel at intervals of about mm, thereby forming a dust collection area 3.

Since the counter electrode 2 in this embodiment uses a flat plate similar to the dust collecting electrode 1, the end of the counter electrode 2 on the gas introduction side is sharpened to generate active corona discharge. .

Of course, the means for generating the corona discharge in the apparatus of the present invention is not limited to these means, and various known means may be arbitrarily employed.

Note that the counter electrode 2 has a temperature of 8 to 8 during normal operation.
A high voltage of about 15 kV is supplied from a high voltage generator 12 via a high voltage supply cable 11.

Therefore, the dust-containing gas discharged from a car traveling in a tunnel (not shown) is
Dust-containing gas introduction passage 1 communicating with the tunnel
3 to the dust collection area 3 and electrically processed.

In this electrical treatment of dust-containing gas, in order to maintain high collection efficiency at all times, as is already known, it is necessary to adhere to the dust collection electrode 1 and the counter electrode 2 that form the dust collection area 3 over time. It is necessary to remove the dust as appropriate.

The removal of these attached dust in this example is as follows:
Taking note of the fact that the adhering dust is a non-adhesive substance, this is carried out using a fluctuating jet gas flow.

The formation of the jet gas stream is carried out by a dry dust-off mechanism 8 which communicates with a compressed air supply source 14 via a compressed air supply pipe 15 .

The dry dust removal mechanism 8 in this embodiment
is constituted by a pipe 17 having a plurality of injection nozzles 16 arranged in parallel in consideration of the number of dust collection passages 3.

Normally, the dry dust removal mechanism 8 having the above-mentioned configuration is arranged at least one stage or more apart from each other as appropriate.

When the dry dust blowing mechanism 8 has four stages as in this embodiment, compressed air flow is distributed and supplied to each stage in order to effectively and effectively blow off dust with the minimum amount of jet air flow. Distribution supply pipe 18 for
Preferably, a solenoid valve 19 is disposed at , by means of which the formation of the injection gas flow is selectively controlled.

Furthermore, in order to effectively and effectively blow off dust with the minimum amount of jet air, it is important that the nozzle part of the means is further rotatable.

Note that when operating the attached dust, the dust-containing gas is supplied to the dust collection area 3 by the opening/closing mechanisms 7a, 7.
blocked by b.

The opening/closing mechanisms 7a and 7b in this embodiment are constituted by a door 21 provided with a cylinder 20.

Of course, the configuration of the opening/closing mechanisms 7a and 7b is not limited to this, and for example, if the dust-containing gas formed in the tunnel is to be supplied via dust, a damper may also be provided. , the selection thereof may be determined by considering the introduction conditions of the dust-containing gas.

In this way, the dust that is blown off by the jet gas flow while the dust collection area 3 is sealed is transferred to the dust transport area 4 that is located below the dust collection area 3 and communicates with it.
The dust particles fall into the dust transport area 4 and are dispersed in the transport airflow supplied into the dust transport area 4.

It should be noted that the dust that is blown off from the dust collection electrode 1 and the counter electrode 2 by the jetted gas flow is significantly coarsened compared to when it was generated due to the agglomeration and coarsening effect.

The dust transport area 4 in this embodiment is connected to each end of a circulation passage 22 that communicates with the ventilation mechanism 9 and the excessive dust collection area 10, respectively.

Further, since the dust conveying area 4 supplies a conveying air flow only when removing attached dust and cuts off the supply during dust collection operation, an opening/closing mechanism 2 consisting of a damper is provided.
3a and 23b.

As described above, the operation for removing adhered dust in the present invention is performed while the cleaning process for the dust-containing gas is interrupted.
b, 23a, 23b, dry dust removal mechanism 8, ventilation mechanism 9, excessive dust collection area 10, high voltage generator 12, etc., are all automatically controlled.

Usually, the automatic control is performed by monitoring the state of dust adhesion within the dust collection area 3 or by setting a dust collection time in advance and generating a control signal.

Note that the control means has already been adopted in general electrostatic precipitators, and the selection thereof is not limited to the above-mentioned means, and other known means may also be freely adopted.

Additionally, the removal of adhering dust and its separation and recovery operations in the present invention can be significantly shortened by using the conveying air stream, but since the cleaning process of the dust-containing gas is temporarily interrupted, Usually, as shown in FIG. 2, at least two or more are arranged in parallel and selectively operated.

Of course, when a plurality of devices of this kind are installed, they can be stacked in addition to being simply installed side by side, or in some cases, they can be stacked in multiple tiers and arranged in multiple rows. The choice is free and unrestricted.

When the operation for removing the attached dust is completed, the supply of the dust-containing gas to the dust collecting passage 3 is restarted, and the cleaning process of the dust-containing gas is normally performed.

In FIG. 2, two equipment units are installed in parallel in the transverse direction of the dust-containing gas introduction passage 13, one of which performs the cleaning process of the dust-containing gas, and the other unit performs the cleaning process of the dust-containing gas. This shows an operating state in which adhering dust is being removed during that time.

Therefore, in the case where the cleaning process of dust-containing gas is being performed, the door 21 is opened by the cylinder 20, and in the case where the process of removing attached dust is being performed, the door 21 is opened by the cylinder 20. It is likewise closed by a cylinder 20.

In the present invention, even if a plurality of dust collection areas 3 are provided as shown in FIG. 2, the operation of the ventilation mechanism 9 and the excessive dust collection area 10 can be performed selectively. One unit can be used for both purposes.

In addition, these ventilation mechanism 9 and excessive dust collection area 1
The scale of 0 is a comparison between the processing air volume and the jet gas flow rate from the dry dust removal mechanism 8 to prevent the removed dust from being scattered again and to effectively guide the removed dust to the over-collection area 10. Since the flow rate of the carrier gas is only a small amount, it is possible to use a device that is significantly smaller.

Furthermore, in the embodiment of FIG. 2, the high voltage supply from the high voltage generator 12, the supply of the compressed air flow from the compressed air supply source 14, and the circulating supply of the carrier air flow to the dust transport area 4 can be selectively switched. machine 24,2
5 and 26, respectively.

FIG. 3 shows a structure for rotating the injection nozzle 16 of the dust removal mechanism 8 shown in FIGS. 1 and 2 and reciprocating it left and right.

In FIG. 3, 27 indicates the injection nozzle 16 approximately 90
The piston rod 28 of the cylinder 27 is a cylinder provided for rotation, and the tip thereof is a flanged bush 29 into which the pipe 17 equipped with the injection nozzle 16 is integrally inserted.
It is rotatably supported by a support 30 via a stop pin 31. Further, the main body of the cylinder 27 is held via a holder 34 by a bracket 33 that is fixed to a side wall 32 of a chamber for accommodating the dust collection area 3.

Note that the flanged bushing 29 is attached to the side wall 3.
It is rotatably held relative to 2.

Therefore, piston rod 2 of cylinder 27
When 8 expands and contracts, the reciprocating movement caused by the expansion and contraction is converted into rotational movement by the support 30, and the flanged bush 29 is rotated via the support 30.

In this embodiment, a pipe 17 provided with a plurality of injection nozzles 16 connects to the flanged bush 2.
The pipe 17 is inserted into the flanged bushing 29 via a key 35 so as to rotate together with the flanged bushing 29, and thereby the pipe 17 rotates integrally with the flanged bushing 29. .

36 is a cylinder for reciprocating the injection nozzle 16 in the left and right direction;
The tip of the piston rod 37 of No. 6 is integrally fixed to the pipe 17 via a support 38, and the main body of the cylinder 36 is integrally fixed to the flanged bush 29 via the support 39.

Therefore, the piston rod 3 of the cylinder 36
When 7 expands and contracts, the expansion and contraction movement is directly transmitted to the pipe 17, thereby forcibly moving the pipe 17 from side to side.

In this embodiment, if dust adheres to the outer surface of the pipe 17 located at the mounting end of the flanged bush 29, it will hinder the reciprocating movement of the pipe 17. 4
0 is attached so as to cover this part. Further, this type of bellows tube 40 has the above-mentioned cylinders 20, 2.
It can also be installed on 7 and 36.

According to the present invention employing the above configuration, dust-containing gas formed in an automobile tunnel is first passed through the dust collection area 3 in which an electric field is formed, thereby removing dust from the gas to be treated by the dust collection electrode 1. In addition, the dust that adheres to the dust collection electrode 1 and the counter electrode over time is collected in the form of coarse particles, and is also swept away from the dust collection electrode 1 in a dry state to the dust transport area 4. drop, the dust transport area 4
Since the coarse particles swept away by the dust are made into a dispersion containing a concentration higher than that of the gas to be treated, and the dispersion is led to the excessive dust collection area 10 and separated from the conveying airflow, the processing air volume is significantly increased. The inside of a large tunnel can be effectively cleaned using a compact device, and the operation for removing adhering dust can be extremely smooth and the processing time can be shortened.

Further, even if the device units were stacked in multiple stages, almost no dead space was created.

Furthermore, even when the device was operated for a long time, there was no problem of insufficient dust discharge.

[Brief explanation of the drawing]

FIG. 1 is a partial systematic explanatory diagram for explaining one embodiment of the present invention, FIG. 2 is a concrete explanatory diagram of FIG. 1, and FIG. 3 is a dry type according to the present invention. It is a perspective view for explaining a preferred specific example of the dust removal mechanism, in which reference numeral 1 is a dust collection electrode, 2 is a counter electrode, 3 is a dust collection area, 4 is a dust transport area, 7a and 7b are opening/closing mechanisms,
8 is a dry dust removal mechanism, 9 is a ventilation mechanism,
10 is an excessive dust collection area, 12 is a high voltage generator, 14
is a compressed air supply source, 16 is an injection nozzle, 20,2
7 and 36 indicate cylinders, respectively.

Claims (1)

[Scope of Claims] 1. An electric dust collection area equipped with a dust collection electrode and a counter electrode, a dust transport area located below the dust collection area and directly communicating with the dust collection area, and an inlet and an outlet of the dust collection area during dust collection operation. An opening/closing mechanism for opening and closing these during dust transport, a dry dust removal mechanism for brushing off the dust adhering to the dust collecting electrode into the dust transport area, and supplying a transport current to the dust transport area and dispersing the dust. In an electrostatic precipitator comprising a ventilation mechanism for discharging or suctioning dust in the form of objects out of a transport area, and a mechanical dust collection area provided on the discharge or suction side of the ventilation mechanism, the dry dust The blowing off mechanism is equipped with an injection nozzle that injects compressed air for blowing off the dust adhering to the dust collection electrode surface, and a mechanism that moves the injection nozzle in parallel from side to side and oscillates up and down. The conveying area has substantially the same installation area as the electrostatic precipitating area, and is configured such that a layered dust conveying airflow in a constant direction is formed over the entire area of the dust conveying area during dust discharge. Electrostatic precipitator, characterized in that the dust that is blown away by the blowing of compressed air is carried by the dust conveying airflow of the dust conveying zone and discharged to the mechanical dust collecting zone. Device.