JPH06142551A - Static electric filter - Google Patents

Abstract

PURPOSE: To provide an electrostatic filter which does not need to be disassembled in order to clean the inside thereof. CONSTITUTION: This electrostatic filter consists of a tube 1 and a wire 9 each having differential potential, and a cleaning means 13 uses the wire in the axial direction to scrub the inner wall of the tube. A cup 15 is provided by which the tube 1 is closed when the cleaning means 13 is engaged with the tube 1 to perform cleaning. A control means controls the cleaning means 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic filter having a cleaning system or an unclogging system.

[0002]

BACKGROUND OF THE INVENTION In a cylindrical geometry, electrostatic filters generally consist of a tube of strained wire extending in its axial direction or a network of tubes in parallel. One end of the tube has an admission pipe (admission
pipe) and the other end is an open pipe (release pi
pe), there is an axially flowing gas inside the tube, which dust can be removed.

By raising the wire to a potential different from that of the tube, the gas is ionized, thus leading to the charging of the dust, which is attracted by the finally contacting tube. Therefore, the sediment (depo
sit) forms on the inner wall of the tube and this deposit must be cleaned regularly.

[0004]

Although cleaning can be carried out in a liquid medium, this method has the disadvantage of producing a large amount of waste liquid. Especially in the case of radioactive waste liquid, is it necessary to take any measures against these large amounts of waste liquid? , Or storage is required. On the other hand, in the case of the dry method, its use has traditionally consisted of mechanical cleaning operations involving shock or sound waves applied to the tube. However, the resulting action provided by this method of operation is not necessarily effective on all types of dust.

There are other systems in which a brush or cleaning means similar to a brush slides inside the tube to scrape the inner wall of the tube, but this system has the following disadvantages. That is, dust is
Partially resuspended and a non-negligible amount of dust downstream the filter. This is because the power supply to the tube must be stopped during cleaning.

Therefore, it is an object of the present invention to provide an electrostatic filter with an effective cleaning device.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the electrostatic filter according to the present invention has a tube cross-section for each filter system constituted by a tube and a wire. 2) cleaning means and control means capable of engaging with the cleaning means in the tube and capable of sliding the axial direction to separate the cleaning means from the tube.

The system also includes an accessory controlled by the control means to close or seal the tube when the cleaning means is engaged and to open the tube when the cleaning means is disengaged. The opening and closing means.

Therefore, there is an almost perfect confinement barrier for redeposited dust.

The cleaning means can be constituted, for example, by brushes located around a core that slides the wire, or by scraping lips.

The means for opening and closing the tube can be in the form of cups or caps placed over the cleaning means to seal the ring located around the core, and otherwise the core. Seals or sealing joints (se
There is also a shape of aling joints.

In the case of cups, the tube is formed of an expanded upper portion within which each cup slides and a retaining portion, the retaining portion being located below the upper portion. , And the cups come into contact and rest on this part.

Thus, during cleaning, gas flow through the tube is interrupted.

The effect of this interruption is diminished if several filter systems are installed in parallel and only one of them is cleaned. However, then further problems arise. It is more preferable to use a common device for applying to the wire, so that during cleaning the wire may have an operating potential.
This is because it must be kept.

Particularly in the case of hot gases, the cleaning means must be made of an electrically conductive material. If the electrical supply circuit is hung and the weight is subdivided into a cable that communicates with each wire, a short circuit between the wire and the tube can be further avoided.

Accordingly, the filter is configured so that the weight is collected by an electrically conductive cup located above the cleaning means as the weight moves away from the tube.

However, in order to perform the cleaning operation,
As the cleaning means slides through the tube, the weight and the cable on which the weight is suspended are separated from each wire by an electrically insulating zone.

With this arrangement, the brush is slidable in the tube in the electric circuit composed of the wire, the cleaning means, the cup and the weight.
Stop when scraping the inner wall of the tube.

Finally, the core can be equipped with a wire scraping device.

[0020]

According to the present invention, different potentials are set between the wire and the tube. The cleaning means is moved axially within the tube. The tube is closed to prevent dust from floating when the cleaning means is engaged with the tube, and the tube is opened to remove dust when disengaged.

[0021]

EXAMPLE FIG. 1 shows a single electrostatic filter.
ctrostatic filter), which is composed of a vertical tube, and the lower end of the tube passes through a closed tank 3 to a gas intake pipe 2
To the discharge pipe 4 via the funnel or hopper 5. The upper end is closed at its top by a cover 6, which has a central opening sealed by an insulating plug 7.

An electric supply cable 8 reaches a plug 7, the electric supply of which extends downwards in the tube 1 by means of a conducting wire 9 which runs through the plug 7 and by means of a weight 10 of the tank 3. I'm nervous inside.

Due to the effect of the electricity supply cable 8, the conducting wire 9 is raised to a potential different from that of the tube 1, which is grounded.

The plug 7 is provided with two holes for passing two cords or two ropes 11, a columnar core 12 is hung on the cord or rope, and Radial hairs or bristles of the brush 13 are provided on the outer circumference.

The core 12 has a single central hole through which the conductive wire 9 passes. Therefore, when the rope 11 is moved up and down, the brush slides along the wire 9 inside the tube 1 and the hopper 5.

In the case of the first embodiment, the bristles of the brush 13 scratch the inner wall of the tube 1.

In the case of the second embodiment, the brush 13 is the hopper 5.
And does not interfere with the gas flow.

Therefore, the cleaning consists of sliding the brush 13 along the conducting wire 9 and the tube 1 periodically.

The hard deposit, torn by the brush, falls to the bottom of the tank 3, which is widened at the lower end of the tube 1 for this purpose.

A brush 13 on the surface of the core 12 is provided with a lip seal 14, which scrapes the conductive wire 9 and removes the deposits covering the wire.

The hole of the plug 7 is provided with a seal (not shown) for confining the gas flow.

The bristles or felts of the brush 13 make it possible to scrape off hard solid deposits and deposits that are naturally formed. If necessary, the bristles can be metallic.

When the core 12 and the brush 13 are located in the funnel or hopper 5, the cup 15 is placed on the core and the brush, and the diameter of the cup exceeds the diameter of the tube 1. . Therefore, the cup is placed on the funnel 5 for cleaning, and when the brush 13 scrapes the inner wall of the tube 1,
Effectively plug the tube. Therefore, there is no need to fear the rise of dust.

The rope 11 and core 12 are expediently made of an electrically insulating material, but the rope and core can also be conductive.

In order to avoid a short circuit with the tube, the power supply to the conducting wire 9 must be interrupted in any case during the removal of deposits.

In FIG. 2, the cleaning and sealing system is different from that in FIG. The central core 12 is a rope
It has been replaced with the piston body 16 hung on 11. The diameter of the piston body is approximately equal to the diameter of the tube 1. A sealing ring 17 is provided on the outer circumference of the upper portion of the piston body 16, and the sealing ring rubs the inner surface of the tube 1, and the lower outer circumference of the piston body 16 scrapes off the inner surface of the tube 1 to collect dust. Equipped with a scraping pin grip 18 for removing.

The packing box (19) is moved by the piston body (16), scraping the wire to clean it and blocking any gas passage between the wire and packing box to provide the necessary sealing action. Complete.

It is preferred that the tube have a uniform section in such a configuration. The funnel 5 is therefore replaced by an electrically insulating envelope 20, which is cylindrical and extends into the actual tube 1.

The discharge pipe 4 is open at the bottom of the emperop 20 as shown.

The piston body 16 is pulled up above the joint between the insulating envelope and the tube.

The filter of FIGS. 3, 4 and 5 consists of six vertical tubes 21, which are regularly distributed on a circle around an inaction central tube 22. .

After the gas has passed through the collecting tank 25, it leaves the device by the discharge pipe 4 above the tube 21 as in the previous embodiment.

The gas is distributed to the distribution tank 24 by the suction pipe 23.
(Distribution tank) to reach the lower end of the rear tube 21. However, in this case, the suction pipe 23 is a distribution tank.
It is tangential to the 24 walls and opens into the tank. It has a gas tube 21 where dust can be removed
This is because the cyclone is formed at a point depending on the vortex flow in the front part of the opening of the opening, which helps the cyclone to have a uniform flow distribution.

The tube 21 is connected to the collecting tank 25 by a hopper 26 formed of an insulating material, and each tube is
It has an upper conical portion 27 and a lower cylindrical contact portion 28.

An insulating cover 29 is mounted on the upper surface of the collecting tank 25 and supports six motors 30 for best observation in FIG. 4, each motor operating a drum 31, from which a brush is driven. Cord with 33 suspended or rope 32 hanging. In this example,
The conductive wire, which is axially strained in the tube, is fixed to the cover 29 by the upper end of the tube and is not directly connected to the potential required for the filter ring.

The wire 34 extends into the distribution tank 24 in which it is tensioned by the weight 35.

An insulating support part 36 is incorporated into the device to allow for gas vortex flow. The support is an integral plug 37 for the central tube 22.
And the rod 38 that is essential for the plug 37, and the rod 38
It consists of an integral star-shaped member 39, with the end of each branch of the star-shaped member 39 having a hole into which the conducting wire 34 is inserted. FIG. 5 shows the star-shaped member 39.

The brush 33 is composed of a core 40 that slides over a conductive wire 34 formed of an electrically conductive material and is in electrical contact with the wire 34.

The brush 33 further includes bristles (or something other than the bristles) for scratching the inner wall of the tube 21, and a cup 41 made of a conductive material and placed on the core 40. Composed by. Brush 33 is tube 2
It spans all the sections of 1 and is provided with holes for ropes 32 and conducting wires.

The hoppers 26 are joined together at the point junctions 42 while expanding their widths. 6 at the junction
A book of conductive cables 43 is attached, each cable extending through a hopper 26 and a weight 44 terminated at the cable. Electricity supply cable 45
Passes through the cover 29 by means of terminal lugs and raises the conducting cable 43 to the required potential difference on the conducting wire 34.

When the brush 33 is performing the cleaning operation, the conductive cable 43 corresponding to the in question tube hangs down in the hopper, the length of which cable 44 allows the weight 44 to lean against the cylindrical portion 28. It can be seen that it is sufficient to confirm.

Since the hopper 26 is made of an insulating material, the conducting cable 43 cannot be connected to the conducting wire 34, so that there is no need to fear a short circuit due to the brush 33.

The cup 41 is in the tube during the cleaning operation.
Used to close 21. At this time, the cup 41 rests on the contact surface 46 (an abutment surface) on the cylindrical connection 28. However, the cup can also be placed on the actual tube 21.

The brush 33 of the other tube 21 is pulled up into the hopper 26 and the collecting tank 25. In this position the cup 41 is pulled up from the contact surface 46 by the core 40 and collects the weight 44. Thus, the conductive wire 34 is raised to the potential required for filtration as an effect of the circuit in continuity with the electricity supply cable 45, the conductive cable 43, the cup 41 and the core 40.

Thus, while one of the tubes 21 is being cleaned, even when a single supply is present for multiple conducting wires 34, ie a single (electrical) supply is equipped with tubes. It is possible to continue the filtration even when branching inside the device.

The cup 41 on the contact surface 46 is a tube that has been cleaned and is temporarily incapable of performing filtration.
Remove any gas flow through 21. If necessary (eg if the gas is hot) the cord (32 or 11) can also be electrically conductive. The part around which the cord is wound or suspended, for example the drum 31, is then insulated.

The gas conveniently flows through tube 1 or 21 towards the top so that the separated dust exits from the downstream of the filter device.

[0058]

Since the electrostatic filter according to the present invention is constructed as described above, the tube is closed during the cleaning to prevent dust from floating in the tube, so that the cleaning effect can be enhanced. .

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a third embodiment of the present invention.

FIG. 4 is a plan view of a cross section taken along line AA of FIG.

FIG. 5 is a detailed view when viewed from below.

[Explanation of symbols]

 1, 21 ...... Tube 9, 34 ...... Wire 8, 43, 45 ...... Electrical circuit 13, 18, 33 …… Cleaning means 11, 32 …… Control means 13, 33, …… Brush 12, 16, 40… … Central core 17… Sealing ring 18… Scraping lip 19… Seals 15, 41, cup 24… Intake distributor 25… Common collector 28… Electrical insulation zone 43 …… Cable 44 …… Weight 46 …… Holding part

Claims (11)

[Claims] 1. A tube in which a gas flows, in which dust of the gas can be removed, a wire which is axially strained inside the tube, and electricity for increasing the wire and the tube to different potential differences. Electrostatics consisting of at least one filtration system consisting of a circuit, a cleaning means, and a control means for engaging the cleaning means in the tube and sliding the shaft to release the cleaning means from the tube. The filter is characterized in that the filtration system further comprises means controlled by the control means for closing the tube when the cleaning means is engaged and opening the tube when the cleaning means is disengaged. What to do. 2. The electrostatic filter according to claim 1, wherein the cleaning means is composed of a brush. 3. The electrostatic filter according to claim 1, wherein the cleaning means comprises a central core that slides on each wire. 4. The method of claim 3 wherein the means for opening and closing the tube is a sealing ring disposed around the core and a seal abutting the core and disposed around the wire. An electrostatic filter characterized by that. 5. The electrostatic filter according to claim 4, wherein the cleaning unit is a scraping lip arranged around the core. 6. The device according to claim 1, wherein the means for opening and closing the tubes are cups installed on the cleaning means, and the tubes are expanded so that each cup slides therein. An electrostatic filter comprising an upper part and a retaining part which is installed below the upper part and is in contact with the cup. 7. The method of claim 6, wherein the upper portion is a hopper funnel.
An electrostatic filter characterized by being expanded to form 8. The method according to claim 6, wherein the cleaning means and the cup are electric conductors, and the electric circuit also has a cable in which a weight is hung on each wire. An electrostatic filter, characterized in that the weight is collected by the cup when the cleaning means is removed from the tube, and the weight is separated from each wire by an electrically insulating zone when the corresponding cleaning means engages the tube. 9. The electrostatic filter according to claim 8, wherein the insulating zone is a part of a hopper, and the tube opens toward a common collector or a distributor. 10. The electrostatic filter according to claim 1, comprising a cyclone upstream of the tube, and comprising an intake distributor in the front of the tube in which a vortex gas flow is generated. What to do. 11. The method according to claim 1, characterized in that the gas from which the dust can be removed flows upwards, and the cleaning means is engaged with the tube while the cleaning means slides downwards. An electrostatic filter in which the tube is vertical, characterized in that