JP3142524B2 - Cleaning device for electric dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The invention according to this application is to remove and wash dust accumulated on a dust collecting electrode plate of an electric dust collecting device provided for purifying dust-containing air in a tunnel or the like. The present invention relates to a cleaning method and an apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, an electrostatic precipitator has been used for purifying air containing dust, for example, in a tunnel. This electric dust collector applies electric charge to dust particles in the air using corona discharge, and applies a Coulomb force to the charged dust particles to collect the dust particles on an electrode plate. In such a dust collector, as the dust accumulates on the dust collecting electrode plate, the apparent electric resistivity of the dust layer increases, and abnormal discharge called reverse ionization occurs, thereby lowering the dust collecting efficiency. Therefore, in order to maintain the dust collection effect, it is necessary to remove the dust collected on the electrode plate at regular intervals.

As means for removing dust accumulated on the dust collecting electrode plate, for example, as shown in Japanese Patent Publication No. 57-16864, air cleaning (air blow) is performed by blowing air onto the electrode plate on which dust is accumulated. System and JP-A-63-24
As disclosed in Japanese Patent No. 8460, a water washing method of spraying pressurized water toward a dust collecting passage of a dust collecting device to remove dust is generally known and widely used.

[0004] However, the air cleaning method is effective for removing non-sticky dust, but has a weak cleaning power for removing sticky dust, especially for oil. In addition, large cleaning unevenness occurs. On the other hand, in the case of the water washing method, a large amount of water is required, and this method also has a weak washing power for removing dust containing oil, and large unevenness in washing occurs.

[0005] For this reason, in addition to sticky dust, in addition to sticky dust, dust containing oil in exhaust gas of diesel vehicles is often collected like an electric dust collector installed in a road tunnel for automobiles in recent years. Electric dust collector,
The cleaning method as described above cannot be sufficiently cleaned.

Therefore, in the invention described in Japanese Patent Application Laid-Open No. 7-80352, a foam cleaning method is proposed in which a cleaning solution obtained by dissolving a detergent in water at an appropriate ratio is mixed with air at an appropriate ratio, and the generated bubbles are used. I have. In the present invention, in the electric dust collector configured by arranging the vertical dust collecting electrodes in parallel, on the dust collecting airflow inflow side and the outflow side of the dust collecting passage, the fluid pipe members arranged in the horizontal direction are appropriately spaced. With the injection mechanism provided with an injection nozzle facing, in the first step, a dusty cleaning liquid of a detergent and air is injected from the injection mechanism into the dust collection passage to adhere to the dust collection electrode plate, and to remove accumulated dust. In the second step, water and air are sprayed to flow down the remaining foamy cleaning liquid, and in the third step, only air is sprayed to scatter the attached water droplets to clean the liquid.

[0007]

However, this bubble cleaning system is much better in terms of the cleaning effect than the above-described cleaning system using air or water, but the dust collecting air flow inflow side and the outflow side. Because it is a method of blowing from the side,
There is a limit to the distance that the cleaning liquid can reach from the end, and as in recent years, in order to improve the dust collection effect, the size of the electrode plate in which the direction of dust flow has increased has been increased. It is difficult to sufficiently clean the intermediate portion on the outflow side).

For this reason, even in the case of a large dust collecting electrode plate used in recent electric dust collectors, the dust accumulated between the narrow electrode plates can be sufficiently and evenly washed sufficiently with the cleaning liquid bubbles. The device has been longing.

[0009]

SUMMARY OF THE INVENTION Therefore, in order to solve the above-mentioned problems, a method for cleaning an electric dust collecting apparatus according to the present invention is disclosed.
The device has doors on the dust collector air inlet and outlet sides of the dust collector.
A bubble generator for generating washing bubbles while removing
Supply the cleaning foam generated by the generator to the plates of the dust collector
A cleaning foam supply device, and washing after cleaning with the cleaning foam supply device.
Bubble rinsing device with water piping above the plates to wash away the foam
And a drying device for drying the electrode plate after washing.
In the cleaning foam supply device, clean the cleaning foam between the plates from the top of the dust collector.
Supply nozzle to supply the nozzles almost evenly,
The supply nozzle is closed by closing the air flow passage of the dust collector with the opening / closing door.
The cleaning foam is continuously supplied from the
Fill it, spread it over the entire surface of the electrode plate, and send it down.
And the washing foam after washing is distributed to the water in the foam rinsing apparatus.
After rinsing with the water supplied from the tube, the water of the foam rinsing device
Using a pipe, a drying air stream is sent from the drying device.
It is configured as follows. According to this cleaning device,
The cleaning foam evenly supplied between the plates from the
Even if an electrode plate with a long dust flow direction dimension is
The whole dust by the chemical action of the surfactant in the cleaning foam.
Cleaning effect, even for large plates
Can greatly improve, especially sticky dust, oil
The cleaning effect can be improved for a minute. Besides, washing of the electrode plate
You can eliminate the purity. Moreover, from above the electrode plate
The continuously supplied cleaning foam is collected in a dust collector with a closed periphery.
Can be pushed down with the
The entire surface of the plate can be cleaned.

[0010] In addition, a water pipe for washing away the washing foam after washing.
A foam rinsing device having a
Utilizing the water pipe of the device, the dry air flow from the drying device
It is configured to be sent in
Cleaning bubbles can be easily removed from the cleaned electrode plate.

Also, the water pipe of the foam rinsing apparatus is used.
Since the drying air stream is sent from the drying device,
Can prevent freezing of water in the water piping
You.

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings. In the following embodiment, a case where the present invention is applied to an electric precipitator for purifying air in a road tunnel will be described as an example.

FIG. 1 is a perspective view of an electric precipitator provided with a first embodiment of a cleaning apparatus according to the present invention. 2A and 2B are diagrams showing an example of a supply nozzle in the cleaning apparatus, in which FIG. 2A is a perspective view, FIG. 2B is a longitudinal sectional view, FIG. 2C is a bottom view of the nozzle, and FIG. It is a drawing showing an example, (a) is a perspective view, (b) is a longitudinal sectional view, (c) is another longitudinal sectional view, (d) is still another longitudinal sectional view, FIG. FIG. 5 is a perspective view showing still another example, FIG. 5 is a drawing showing another example of the supply nozzle, (a) is a perspective view, (b) is a longitudinal sectional view, and FIG.
FIG. 4 is a perspective view showing another example of the supply nozzle. 7A and 7B are diagrams showing still another example of the supply nozzle, in which FIG. 7A is a perspective view, FIG. 7B is an enlarged view of an end portion, and FIG. 8 is a perspective view showing another example of the supply nozzle. FIG. 9 is a schematic diagram illustrating an example of a cleaning foam supply device and a wastewater treatment facility of the cleaning device illustrated in FIG. 1.

As shown in FIG. 1, an electric precipitator E of this embodiment has one block provided with four vertical and two rows of dust collecting units 1 arranged side by side in three blocks. This is shown. Each of the dust collecting units 1 is provided with a plurality of dust collecting electrode plates 2 arranged in parallel in a vertical direction at a predetermined interval, and a space between the dust collecting electrode plates 2 is a dust collecting passage 3. The dust collection passage 3 has a dust collection air flow inflow side I on the right front side and an outflow side O on the left rear side in the drawing.

The first embodiment of the cleaning device according to the present application is provided in the electric precipitator E configured as described above. This washing apparatus W _1, will be described as an example a part perspective the dust collector E of the left end of FIG.

The cleaning apparatus W ₁ of this embodiment generates a cleaning foam by mixing a cleaning liquid supplied from the supply apparatus F with air at an appropriate ratio, and a supply apparatus F for supplying a cleaning liquid in which a detergent is dissolved and air. A bubble generator G to be generated, a supply pipe 4 for sending the cleaning foam generated by the bubble generator G above the dust collecting electrode plate 2, and a supply pipe 4 from the supply pipe 4 to the dust collecting passage 3 between the electrode plates 2. And a drainage pipe 6 for discharging water and the like after washing the electrode plate 2, a wastewater treatment device H for treating this wastewater, and a control device K for controlling these devices. .

The supply device F is provided with an air pipe 7, a cleaning liquid pipe 8, and a water pipe 9 in this embodiment.
The air pipe 7 and the cleaning liquid pipe 8 are connected to the bubble generator G. The water pipe 9 is configured to be guided to the side of the dust collecting electrode plate 2 so that washing water can be sprayed from above the dust collecting electrode plate 2 to wash away the cleaning bubbles. This water pipe 9 is a foam rinsing device.

The bubble generator G is connected to the air pipe 7 of the supply device F.
The air supplied from the cleaning liquid and the cleaning liquid supplied from the cleaning liquid pipe 8 are mixed at a preferable ratio to generate cleaning bubbles. As the detergent in the cleaning liquid, for example, a weakly alkaline detergent is used, and it is preferable that the detergent can form a cleaning foam having high foam maintenance properties by being mixed with air at a predetermined ratio. A known mechanism may be appropriately selected and applied as a mechanism for mixing the detergent, water, and air. In this embodiment, the cleaning liquid in which the detergent and water are mixed is supplied to the foam generator G by the supply device F, and the cleaning liquid is mixed with the air by the foam generator G to generate the cleaning foam. And the air may be supplied to the bubble generator G to generate a cleaning bubble in the bubble generator G. Also, the detergent, water and air are mixed by the supply device F to generate the cleaning bubble. You may make it do.

The supply nozzle 5A is arranged so as to supply the cleaning foam every two rows of the dust collection unit 1 arranged as described above. Two supply nozzles 5A extending from the supply pipe 4 extending upward to the side of the dust electrode plate 2 in the lateral direction (in the direction perpendicular to the direction of the flow of dust collection air) of the inflow side I and the outflow side O above the dust collection electrode plate 2. Is formed by And these supply nozzles 5
From A, the cleaning foam is supplied almost uniformly between the plates between the dust collecting plates 2. In addition, by flowing the cleaning foam from the supply nozzle 5A disposed above the dust collecting electrode plate 2 between the electrode plates, pressure loss in the dust collecting passage 3 during dust collection can be prevented from increasing. The arrangement of the supply nozzle 5A is not limited to this embodiment, and the dust collecting electrode plate 2
Any arrangement or form that can supply the cleaning foam to the dust collection passage 3 during the above-mentioned process substantially uniformly may be used.

An example of the supply nozzle will be described with reference to FIGS. 2 (a), 2 (b) and 2 (c) show that the supply pipe 4 is disposed up to above the dust collecting electrode plate 2 (FIG. 1).
This is an example in which a supply nozzle 5B that extends in the opening direction of the dust collection passage 3 (FIG. 1) is provided on the side of the dust collection electrode plate, and the opening end of the supply nozzle 5B has a mesh as shown in FIG. Lumber 1
0 is provided.

FIGS. 3 (a), 3 (b), 3 (c) and 3 (d) show a supply pipe 4 arranged above the dust collecting electrode plate 2 (FIG. 1).
In this example, the supply pipe 11 itself is provided as a supply nozzle 5C, and the supply holes 11 provided at the same pitch are moved away from the bubble generator G (FIG. 1) (right side in the figure).
As a large diameter, uniform supply of cleaning foam is achieved. The supply hole 11 may be provided below as shown in FIG.
It may be provided diagonally downward as shown in (c), may be provided horizontally downward as shown in (d), or may be set as appropriate according to the properties of the cleaning foam.

FIG. 4 also shows an example in which a supply hole 11 is provided in the supply pipe 4 and the supply pipe itself is provided as a supply nozzle 5D, similarly to FIG. 3, and as the supply pipe 11 moves away from the bubble generator G (FIG. 1) (FIG. (Right side of the figure) The pitch is narrowed to ensure even supply of cleaning foam. Also in this example, the hole arrangement as shown in FIGS. 3A, 3B, and 3C may be appropriately set.

5 (a) and 5 (b) also show that the supply pipe 4 is disposed above the dust collecting electrode plate 2 (FIG. 1), and the supply pipe 4 has a conical injection port 12a whose diameter is enlarged. The supply nozzle 5E is configured by the circular nozzle 12 being provided. This circular nozzle 12 enlarges the injection ports 12a of the nozzles 12 provided at the same pitch as the distance from the foam generator G (FIG. 1) increases (right side in the figure), and aims to supply even cleaning bubbles. I have.

In the case of these supply nozzles 5B to 5E, the number corresponding to the size of the dust collecting electrode plate 2 is appropriately arranged above the electrode plate so that the cleaning foam can be almost uniformly supplied between the electrode plates. Is done.

FIG. 6 shows that the supply pipe 4 is located above the electrode plate 2 (FIG. 1), and a plurality of branch pipes 13 are provided on both sides of the supply pipe 4 so as to be wide above the dust collection electrode plate 2. This is an example in which piping is provided in the range. In the case of this example, since the pressure on the distal end side of the branch pipe 13 increases, a supply hole 13a having a smaller hole diameter from the base side to the distal end side of the branch pipe 13 is provided to achieve even supply of the cleaning foam. . Depending on the properties of the cleaning foam, the pore diameter may be increased toward the tip.

7 (a) and 7 (b) also show the supply pipe 4 as in FIG.
A plurality of branch pipes 14 are provided on both sides of the branch pipe 14. In this example, a slit 14a extends from the base to the tip of the branch pipe 14.
Are provided to ensure even supply of cleaning foam.

FIG. 8 shows an example in which a meandering pipe 15 connected to the supply pipe 4 is provided above the electrode plate 2. The meandering pipe 15 is provided with a supply hole 15 a for the cleaning foam and the supply hole 15 a. The diameter is increased as the distance from the bubble generating device G increases (right side in the figure), so that the cleaning bubbles are supplied from the supply holes 15a onto the dust collecting electrode plate 2 almost uniformly.

The branch pipes 13 and 14 and the meandering pipe 15 are also examples, and the invention according to this application is not limited to these supply nozzles. What kind of supply nozzle is adopted may be appropriately determined depending on the size of the dust collecting electrode plate 2 and the properties of the cleaning foam.

[0036] Based on FIG. 9, an example of a cleaning foam supply device and waste water treatment facilities in the washing apparatus W _1. In the figure, the left side is the inflow side I of the contaminated air, and the right side is the outflow side O of the cleaning air. The same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In this example, the air p is supplied from the supply device F to the pump 16.
The cleaning water r mixed with the detergent q is supplied to the foam generator G via the cleaning liquid pipe 8 by the pump 16B via the air pipe 7 by A. Also, from this supply device F,
The fresh water s is configured to be supplied to the dust collecting electrode plate 2 via the water pipe 9 by the pump 16C. In this embodiment, the air pipe 7 for supplying air and the water pipe 9 are connected by a communication pipe 17, and the air for electrode drying can be supplied using the water pipe 9. I have. The communication pipe 17 is configured to be opened and closed by a signal from the control device K.

On the other hand, a drain pipe 6 provided at a lower portion of the electric dust collector E is connected to a waste water treatment device H. In the wastewater treatment apparatus H of this example, the cleaning wastewater of the electric precipitator E is forcibly discharged to the raw water tank 19 by the pump 18 and is sent from the raw water tank 19 to the mixing tank 21 by the pump 20.
Thus, a certain amount of coagulant or the like is supplied from the supply device 22 to form a solid. The washing wastewater containing the solid matter is sent to the dehydrator 23, where solid-liquid separation is performed. The solid matter obtained in the dehydrator 23 is transferred to the receiving tank 24,
The purified water is sent to the discharge management tank 25 and discharged. If the discharged purified water is circulated to the supply device F and used as washing water, for example, even in the case of an electric dust collecting device E installed in a tunnel having no water source, water is frequently externally supplied. There is no need to carry in, and the cleaning operation can be performed continuously for a long time.

Further, if the waste water treatment device H is provided in the electric dust collecting device E for cleaning with foam, the washing waste water generated from the electric dust collecting device E (inside washing device) is extremely small. The capacity of each facility can be reduced to reduce the size.

According to the cleaning device W ₁ of the first embodiment configured as described above, the dust collecting electrode plate of the electric dust collecting device can be cleaned as follows.

That is, the cleaning water r and the air p are supplied from the supply device F to the bubble generation device G, and the foamed cleaning bubbles generated by the bubble generation device G are supplied from the supply nozzle 5A to the dust collection electrode 2.
To the top of Since this cleaning foam is almost uniformly supplied from the upper portion of the dust collecting electrode plate 2 to the space between the electrode plates, it flows down the passage 3 between the electrodes 2 almost uniformly, and flows on the dust deposited and deposited on the electrode surface. While flowing down, it repeatedly flows down and down while washing and removing dust by repeating foaming and permeation. The supply time of this cleaning foam is determined by the flow rate of the cleaning foam,
After the cleaning foam supplied from the upper part of the electrode plate 2 flows down to the lower part of the electrode plate 2, the supply is stopped.

In this manner, the dust adhering and accumulating on the entire surface of the dust collecting electrode plate 2 is fluidized by the cleaning foam supplied almost uniformly from the upper portion of the dust collecting electrode plate 2 to the entire surface thereof, and flows downward. The dust can be efficiently removed in a short time.
In addition, since the water used is used as a solvent for the cleaning foam, the amount of water used is small, and the generated cleaning wastewater can be reduced.

Next, water is sprayed from the supply device F via the water pipe 9 toward the surface of the electrode 2 after cleaning. This is a foam rinsing device. Since this water is also supplied from above the dust collecting electrode plate 2, the washing foam is quickly washed away from the electrode plate surface, and the dust remaining in a fluidized state by the washing foam is also washed away. The water supplied from the tip of the water pipe 9 can be supplied to almost the entire surface of the electrode plate 2 by ejecting fine water droplets in the form of mist. In addition, the amount of water required for the water washing may be a small amount since it is only an amount for washing away the cleaning foam and the dust fluidized by the cleaning foam.

Thereafter, the water pipe 9 and the air pipe 7 of the supply device F are communicated with each other by the communication pipe 17, and air is jetted from the communication pipe 17 to the surface of the electrode plate through the water pipe 9 by the pump 16A. . This air is a dry air current that quickly cleans the electrode plate surface by washing away the cleaning bubbles from the surface of the dust collecting electrode plate 2 and scattering and removing remaining water attached to the electrode plate surface. Further, in this embodiment, by sending compressed air for drying the dust collecting electrode plate 2 through the water pipe 9, the dust collecting electrode plate 2 after washing can be dried quickly and the water pipe 9 can be dried. The inside of the pipe 9 can be dried by discharging the rinsing water from the inside, so that freezing in the pipe can be easily prevented in a cold region or the like where there is a risk of freezing.

As described above, bubbles are supplied from the upper surface of the dust collector, and the cleaning bubbles are almost uniformly flowed into the entire space between the narrow electrode plates on which the dust is deposited. Even dust with adhesiveness, especially dust containing oil, etc. can be removed with a strong force, and the electrode plate 2 can be washed evenly. Further, after supplying foam for a certain period of time until the foam drops on the lower surface of the electrode plate 2 due to gravity, these foams are defoamed with a small amount of rinsing water and washed away, so that dust does not adhere to other components. It can be surely washed down. Moreover, the dust attached and deposited on the dust collecting electrode plate 2 can be efficiently and reliably washed and removed in a short time, and the washing operation can be completed in a short time. Thereby, the cleaning interval of the electrode plate 2 can be lengthened.

The washing wastewater thus washed is recovered from the drainpipe to the wastewater treatment device H, and separated into solids and fresh water by the wastewater treatment device H. Further, since the amount of water used can be reduced, the size of the wastewater treatment apparatus H can be reduced, and the cost can be reduced.

FIG. 10 is a perspective view showing a part of an electric precipitator provided with a second embodiment of the cleaning apparatus according to the present invention. The same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, the above-described supply nozzle 5B shown in FIG. 2 is provided at the upper central portion of the dust collection electrode plate 2, and the supply pipe 4 having this supply nozzle 5B is provided on both sides of the dust collection electrode plate 2. The feed pipe 4 extends in the vertical direction.
A supply nozzle 5B for cleaning the insulator 26 is provided in the lateral direction. Also, the inflow side I above the dust collecting electrode plate 2
On the outflow side O, a water pipe 9 is provided. This water pipe 9 also serves as an air supply pipe for drying the electrode plate, as in the first embodiment described above.

According to the cleaning device W ₂ of this embodiment, the cleaning device adheres and deposits on the dust collecting electrode plate 2 and the insulator 26 by the chemical force of the cleaning bubbles while exhibiting the operation and effect of the cleaning device of the first embodiment. It is possible to efficiently clean and remove the collected dust to improve its cleaning effect, particularly the cleaning effect of sticky dust and oil. Also, wash the electrode plate 2 so that there is no
Similarly, the cleaning interval can be extended.

FIG. 11 is a perspective view showing a part of an electric precipitator provided with a third embodiment of the cleaning apparatus of the present invention according to the present invention in a see-through state. The same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the dust collecting units 1 are provided in two stages vertically and two rows horizontally to constitute an electric dust collecting device E, and a rectifying plate 27 is provided between each dust collecting unit 1. . An opening / closing door 28 is provided on the inflow side I and the outflow side O of the dust collecting electrode plate 2 in the electric dust collecting apparatus E. In this embodiment, the opening / closing door 28 is constituted by an automatic opening / closing door that can be opened and closed by a cylinder 30 that expands and contracts with air supplied from a door opening / closing operation air pipe 29 in response to a signal from a control device K (FIG. 1). I have.

According to the cleaning device W ₃ of this embodiment, when the electric dust is collected by the electrostatic precipitator E, the opening / closing door 28 is turned on.
When the electric dust collector E is cleaned by opening the
And the dust collection passage 3 of the dust collection device E is closed. As a result, the electrode plate 2 provided in the dust collector E having walls on both sides and the upper surface has the side surfaces 4 and the upper surface closed. By providing the opening / closing door 28 and making the inside of the dust collecting device E a closed space in this way, the supply nozzle 5C (one example,
The cleaning foam supplied from the other nozzles) to the upper part of the dust collecting electrode plate 2 does not leak from around the dust collecting device E.
It can flow down. Moreover, the supply nozzle 5
If the cleaning foam is continuously supplied from C, the previously supplied cleaning foam is pushed in with the cleaning foam supplied later around the closed dust collecting electrode plate 2 so as to be substantially evenly distributed between the electrode plates 2. Can be supplied. Therefore, according to this example, the surface of the electrode plate is cleaned by filling the closed space in the dust collecting device E with the cleaning foam. Can be washed. At this time, the insulator 26 can also be washed by the filled washing foam, but a nozzle may be provided for the insulator. The waste water thus washed is discharged from a lower part of the dust collecting electrode plate 2 through a drain pipe 6.

Also in this embodiment, after a certain period of time when the cleaning foam breaks and flows down, the remaining foam is washed away with only a small amount of rinsing water supplied through a water pipe to remove the cleaning foam from the electrode plate 2 and the insulator 26. Then, air is supplied from an air pipe also serving as a water pipe, and the electrode plate 2 is dried. These series of operations can be automatically performed by a signal from the control device K.

As described above, even when the surface of the electrode plate 2 is cleaned, a sufficient cleaning effect can be exhibited even if the electrode plate 2 and dust containing tackiness or oil deposited on the insulator 26 are used. Therefore, the dust collection efficiency of the electric dust collector E can be improved. In addition, since the entire electrode plate is cleaned from above the dust collecting electrode plate 2, even the central portion of the large dust collecting electrode plate 2 can be washed evenly. As a result, the number of times of cleaning can be reduced and the cleaning interval of the electrode plate can be made longer, so that the running cost required for cleaning can be reduced.

FIG. 12 is a perspective view showing a part of an electric precipitator provided with a cleaning device according to a fourth embodiment of the present invention in a see-through manner. Since the fourth embodiment is an example in which the rectifying plate 27 in the third embodiment is removed, the same components are denoted by the same reference numerals, and description thereof will be omitted. In the case of the cleaning apparatus W ₄ of this embodiment,
Opening / closing doors 2 provided on the inflow side I and the outflow side O of the dust collector E
8, the cleaning foam supplied from the supply nozzle 5C to the upper part of the dust collecting electrode plate 2 is pushed downward without leaking from the periphery of the dust collecting device E, so that the cleaning bubbles are substantially evenly distributed between the electrode plates 2. , The dust collecting electrode plate 2 can be cleaned in a short time. In addition, the insulator 26 can be cleaned at the same time. Other functions and effects are the same as those of the third embodiment.

It is to be noted that the combination of the components in the above embodiment can be changed or other components can be added, and the invention according to this application is not limited to the above embodiment.

The above-described embodiment is one embodiment, and various changes can be made without departing from the gist of the invention according to this application. The invention according to this application is limited to the above-described embodiment. Not something.

[0056]

The invention according to this application is implemented in the form described above, and has the following effects.

The cleaning bubbles uniformly supplied from the upper part of the electrode plate to the space between the electrode plates can remove the entire dust from the upper part even if the electrode plate has a longer size in the direction of the flow of the collected air. Since the cleaning is performed by the action, the cleaning effect of a large electrode plate can be greatly improved.

In particular, since the cleaning effect can be improved without cleaning unevenness, it is possible to reduce the number of times of cleaning the electrode plate and to reduce the running cost of the cleaning.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electric precipitator provided with a first embodiment of a cleaning apparatus according to the present invention.

FIG. 2 is a drawing showing an example of a supply nozzle in the cleaning device of the invention according to the present application, wherein (a) is a perspective view and (b) is a longitudinal sectional view.

FIG. 3 is a drawing showing another example of the supply nozzle in the cleaning apparatus of the invention according to the present application, wherein (a) is a perspective view, (b) is a longitudinal sectional view, and (c) is a longitudinal section showing another example. FIG. 4D is a longitudinal sectional view showing another example.

FIG. 4 is a perspective view showing still another example of the supply nozzle in the cleaning device of the invention according to the present application.

FIG. 5 is a drawing showing another example of a supply nozzle in the cleaning apparatus of the invention according to the present application, wherein (a) is a perspective view and (b) is a longitudinal sectional view.

FIG. 6 is a perspective view showing another example of the supply nozzle in the cleaning device of the invention according to the present application.

FIG. 7 is a view showing still another example of the supply nozzle in the cleaning apparatus of the invention according to the present application, wherein (a) is a perspective view,
(b) is an enlarged view of the end.

FIG. 8 is a perspective view showing another example of the supply nozzle in the cleaning device of the invention according to the present application.

9 is a schematic diagram showing an example of a cleaning foam supply device and a wastewater treatment facility of the cleaning device shown in FIG.

FIG. 10 is a perspective view showing a part of an electric precipitator provided with a second embodiment of the cleaning device of the invention according to the present application.

FIG. 11 is a perspective view showing a state in which a part of an electric precipitator provided with a third embodiment of the cleaning apparatus of the invention according to the present application is seen through.

FIG. 12 is a perspective view showing a state in which a part of an electric precipitator provided with a fourth embodiment of the cleaning device of the invention according to the present invention is seen through;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Dust collection unit 2 ... Dust collection electrode plate 3 ... Dust collection passage 4 ... Supply piping 5A, 5B, 5C, 5D, 5E ... Supply nozzle 6 ... Drain pipe 7 ... Air piping 8 ... Cleaning liquid piping 9 ... Water piping 10 ... Mesh material 11 ... supply hole 12 ... circular nozzle 12a ... injection port 13, 14 ... branch pipe 13a ... supply hole 14a ... slit 15 ... meandering pipe 15a ... supply hole 16A, 16B, 16C ... pump 17 ... communication pipe 18 ... pump 19 ... raw water tank 20 ... pump 21 ... mixing tank 22 ... supply device 23 ... dehydrator 24 ... receiving tank 25 ... discharge control tank 26 ... insulator 27 ... rectifying plate 28 ... opening / closing door 29 ... door opening / closing operation air pipe 30 ... cylinder I ... inflow side O ... outflow side E ... electrostatic precipitator F ... feeder G ... bubble generating device H ... wastewater treatment device I ... dust collecting airflow inlet side K ... controller _{W 1, W 2, W 3} , W 4 ... washing apparatus

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tatsuya Ohno 3-1-1 Higashi Kawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Plant (56) References JP-A-7-80352 (JP, A JP-A-10-244183 (JP, A) JP-A-4-317755 (JP, A) JP-A-60-28840 (JP, A) US Patent 4,134,741 (US, A) (58) Fields studied (Int .Cl. ⁷ , DB name) B03C 3/00-3/88

Claims (1)

(57) [Claims] An opening / closing door is provided on an inflow side and an outflow side of a dust collector of a dust collector, a foam generator for generating cleaning foam, and a cleaning foam generated by the foam generator is supplied to an electrode plate of the dust collector. Cleaning with a cleaning foam supply device;
With a water pipe above the electrode plate to wash away the cleaning foam after washing
A rinsing device and a drying device for drying the washed electrode plate are provided, and the cleaning foam supply device is provided with a supply nozzle for supplying the cleaning foam almost uniformly between the electrode plates from the top of the dust collector. 該供 closes the air flow passage of the dust collector at the door
Together constitute by spread plate entire surface by filling the dust collector by continuously feeding the cleaning foam from the sheet nozzle to send downward, the cleaning foam after cleaning the foam rinsing instrumentation
After rinsing with water supplied from the water pipe of
Utilizing the water pipe of the device, the dry air flow from the drying device
A cleaning device for an electrostatic precipitator, wherein the cleaning device is configured to be fed.