JPH11114449A - Electrode washing mechanism for electric precipitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance washing work efficiency by laterally spraying a washing soln. to a dust collecting electrode. SOLUTION: The electrode washing mechanism 12 of an electric precipitator 11 equipped with a rod-shaped discharge electrode 14 and cylindrical dust collecting electrodes 17 for electrically attracting and collecting dust charged by the discharge electrode 14 is constituted of the washing soln. passages provided to the hollow rod-shaped charge electrode parts 25 of the discharge electrode 14, the washing soln. spraying nozzles connected to the washing soln. passages and a washing soln. supply system 35 supplying a washing soln. to the washing soln. passages and recovering the washing soln. after sprayed on the dust collecting electrodes 17. The washing soln. spraying nozzles are constituted of a plurality of the small holes provided to the outer peripheries of the hollow rod-shaped charge electrode parts 25 toward the dust collecting electrodes 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode cleaning mechanism for an electrostatic precipitator, which efficiently cleans and removes dust adsorbed on a dust collecting electrode of the electric precipitator.

[0002]

2. Description of the Related Art In an electric dust collector, when a large amount of dust adheres to the dust collecting electrode, the dust collecting function is reduced. Therefore, cleaning of the dust collection electrode is indispensable.

Ideally, as a means for cleaning the dust collecting electrode, a spray nozzle is installed at a position facing the dust collecting electrode, and the cleaning liquid is sprayed directly on the dust collecting electrode. However, since the interval between the discharge electrode and the dust collecting electrode is narrow, if the spray nozzle is provided with the interval, an electrical short circuit occurs, which hinders the dust collecting function. Also, since the discharge area between the discharge electrode and the dust collection electrode is a discharge area calculated by design,
It is not permissible to increase the distance between these nozzles ignoring the design.

Conventionally, therefore, a method of dropping or spraying a cleaning liquid from above a dust collecting electrode has been generally performed. Examples of this are "Electric dust collector" described in JP-B-60-25192 and "Duct-type dust collector and its operating method" described in JP-B-3-16663.

[0005] In the "Electric precipitator" described in Japanese Patent Publication No. 60-25192, a water supply pipe 2 and a water sprinkling pipe 3 are provided at the upper end of a dust collecting electrode 1 as shown in FIG.
The water is dropped from the fountain port 4 to the dust collecting electrode 1 to wash dust adhered to the surface of the dust collecting electrode 1.

[0006] In "Duct type electrostatic precipitator and its operation method" described in Japanese Patent Publication No. 3-16663, FIG.
As shown in FIG.
The cleaning is performed by spraying cleaning water from the electrode cleaning nozzle 6 toward the electrostatic precipitator 5.

[0007]

However, in the conventional apparatus having the above-mentioned structure, both the "electric dust collector" and the "duct type dust collector and its operating method" basically have a dust collecting electrode. To spray water from above. For this reason, the washing water falls almost in parallel to the dust collection electrode. It is not a structure that can spray water from the direction perpendicular to the dust collection pole.

As a result, most of the cleaning water directly falls without contributing to the cleaning of the dust, and there is a problem that the cleaning efficiency is low.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an electrode cleaning mechanism for an electric precipitator in which water can be sprinkled from a direction substantially perpendicular to the dust collection electrode to improve the work efficiency of the cleaning operation. The purpose is to provide.

[0010]

According to a first aspect of the present invention, there is provided an electrode cleaning mechanism for an electrostatic precipitator, comprising: a discharge electrode for charging dust; and a collector for electrically attracting and collecting the dust charged by the discharge electrode. In an electric precipitator including a dust electrode, a cleaning liquid passage provided in the discharge electrode and through which a dust collecting electrode cleaning liquid is passed,
One or more cleaning liquid spray nozzles for spraying the cleaning electrode from the cleaning liquid passage toward the opposing collection electrode,
A cleaning liquid supply system that communicates with the cleaning liquid passage, supplies the cleaning liquid to the cleaning liquid passage, and collects and circulates the cleaning liquid sprayed from the cleaning liquid spray nozzle to the dust collecting electrode. And

With the above configuration, when cleaning the dust collecting electrode, the cleaning liquid is supplied from the cleaning liquid supply system to the cleaning liquid passage, and is sprayed from the cleaning liquid spray nozzle at the tip thereof to the dust collecting electrode. At this time, since the cleaning liquid spray nozzle can spray the cleaning liquid at an angle close to a right angle with respect to the opposing dust collection electrode, the cleaning liquid surely falls on the surface of the dust collection electrode, and the dust attached to the surface is washed away. Fall down. The dropped cleaning liquid is collected in the cleaning liquid supply system, supplied again to the cleaning liquid passage, and circulated.

According to a second aspect of the present invention, in the electrode cleaning mechanism for an electric dust collector, the dust collection electrode is formed in a cylindrical shape, and the discharge electrode is
A discharge needle that is inserted into the cylindrical dust collection electrode and discharges and charges dust, and a hollow rod-shaped charge electrode portion that supports the discharge needle while being inserted into the cylindrical dust collection electrode. Consisting of
The cleaning liquid passage is constituted by the internal space of the hollow rod-shaped charged electrode section, and the cleaning liquid spray nozzle is constituted by a small hole provided on the outer periphery of the hollow rod-shaped charged electrode section. .

According to the above configuration, the air containing dust is passed through the cylindrical dust collecting electrode. At this time, the dust is charged by the discharge needle of the discharge electrode, adsorbed by the dust collection electrode, and removed from the air.

On the other hand, when a large amount of dust is attracted to the dust collecting electrode, a cleaning operation is performed. In this cleaning operation, the cleaning liquid is supplied from the cleaning liquid supply system to the cleaning liquid passage in the charged electrode portion,
The cleaning liquid is sprayed from small holes serving as the cleaning liquid spray nozzle to the periphery. The sprayed cleaning liquid surely falls down on the inner wall of the dust collecting electrode at a right angle or an angle close to the inner wall, and drops downward while washing away the dust. The dropped cleaning liquid is collected in the cleaning liquid supply system, supplied again to the cleaning liquid passage, and circulated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the electrode cleaning mechanism for an electrostatic precipitator according to the present invention will be described below with reference to the accompanying drawings.

The electrode cleaning mechanism 12 for the electric precipitator 11 of this embodiment is configured as shown in FIGS. 1, 4 and 5. FIG. 1 is a schematic diagram showing an electric precipitator 11 and an electrode cleaning mechanism 12 incorporated therein, and FIG.
FIG. 5 is a schematic bottom view showing the electric dust collector 11 of FIG.

The electric precipitator 11 mainly includes a main body 13 and a discharge electrode 14 inserted into the main body 13.

The main body 13 is formed in the shape of a square tube as a whole.
The inside is divided into a square tubular passage divided into 16 parts. Each of these rectangular tubular passages serves as a dust collecting electrode 17 for electrically attracting and collecting dust charged by the discharge electrode 14. A bottom plate 18 is provided at a lower portion of the main body 13. The bottom plate 18 is formed to be inclined in one direction (to the left in FIG. 1).

On one side (left side in FIG. 1) of the lower part of the main body 13, an inlet 19 for air containing dust is provided. Bottom plate 1
An air inflow space 20 from the inlet 19 is provided between each of the dust collection poles 8 and each of the dust collection electrodes 17. Is to be flowed into. The air that has passed through the dust collecting electrode 17 is discharged outside through the outlet 21 at the upper end.

An electrode receiving portion 22 is provided on the upper portion of the main body 13. The discharge electrode receiving portion 22 is formed so as to protrude from the upper portion of the main body 13 to the left and right sides, and supports the discharge electrode 14 in a state where it is inserted into each dust collecting electrode 17.

The discharge electrode 14 charges the dust in the air flowing into the dust collecting electrode 17 and also charges the charged dust to the dust collecting electrode 1.
It is for pushing to the side 7 and adsorbing and collecting on the dust collecting electrode 17. This discharge electrode 14 is mainly inserted into each of the rectangular cylindrical dust collection electrodes 17 and discharges the discharge needles 24 to charge the dust in the air flowing therearound. A hollow rod-shaped charge electrode portion 25 that supports the discharge needle 24 at the distal end portion and pushes the charged dust toward the dust collection electrode 17 with Coulomb force, and a load that supports the charge electrode portion 25 in a state where the discharge needle 24 is inserted into the discharge needle 24. And an electrode support 26.

The load electrode support section 26 has four load electrode sections 25.
Four support plates 28 for supporting in a row,
An insulator 29 is provided on the discharge electrode receiving portion 22 of the main body 13 and supports each support plate 28 from below both ends thereof. By arranging four support plates 28 supported by insulators 29 in parallel, 16 load electrode portions 25 are aligned with and supported by each dust collecting electrode 17.

The load electrode section 25 is configured as shown in FIGS. The whole is formed in a hollow rod shape, and is divided on the way. The divided portions are connected by a connection plug 31. The inside of the loading electrode section 25 is a cleaning liquid flow path 33 of the electrode cleaning mechanism 12 described later,
Reference numeral 1 denotes a stopper for closing the cleaning liquid flow path 33.

As shown in FIGS. 1, 4, 6 and 7, the electrode cleaning mechanism 12 includes a cleaning liquid passage 33 through which the dust collecting electrode cleaning liquid W flows in the dust collecting electrode 17, and a tip of the cleaning liquid passage 33. Cleaning liquid spray nozzles 34 that are provided laterally in the vicinity of the part and spray the dust collection electrode cleaning liquid W toward the collection electrode 17.
And a cleaning liquid supply system 3 for supplying the cleaning liquid W in communication with the cleaning liquid passage 33 and collecting and circulating the cleaning liquid W sprayed from the cleaning liquid spray nozzle 34 to the dust collecting electrode 17.
And 5. The cleaning liquid spray nozzle 3
The spray of the cleaning liquid W from the cleaning liquid spray nozzle 4 may be in a completely atomized state.
4 may be blown out. In addition, as the cleaning liquid W, water, oil, or another cleaning liquid is used.

As shown in FIGS. 6 and 7, the cleaning liquid passage 33 is formed by the internal space of the hollow rod-shaped charged electrode portion 25. The upper portion of the internal space of the load electrode portion 25 which is closed by the connection plug 31 is a cleaning liquid passage 33.

The cleaning liquid spray nozzle 34 is shown in FIGS.
As shown in (2), the cleaning liquid passage 33 is provided at the front end (lower end). Specifically, it is provided immediately above the connection plug 31 in the internal space of the charge electrode section 25. The nozzle 34 for spraying the cleaning liquid is vertically arranged around the charged electrode portion 25.
It is constituted by small holes 34A provided in each of the six stages. Each of the small holes 34A is formed in a tapered shape whose diameter is increased outward, so that the cleaning liquid W spouting outward is diffused. The inner diameter and the angle of the taper of the small hole 34A are appropriately adjusted according to the desired spray state. As shown in FIGS. 8 and 9, the arrangement of the small holes 34 </ b> A is arranged at equal intervals (60-degree intervals) around the load electrode portion 25, and the arrangement of the small holes 34 A is shifted from each other. Thus, the cleaning liquid W is evenly sprayed around the load electrode section 25.

The cleaning liquid supply system 35 supplies the cleaning liquid W to the cleaning liquid passage 33 during the cleaning operation of the dust collecting electrode 17, and collects and circulates the cleaning liquid W after the dust has been washed away. As shown in FIG. 1, the cleaning liquid supply system 35 mainly includes a recovery pipe 37, a separation tank 38, a cleaning liquid supply pump 39, a cleaning liquid supply pipe 40, and a cleaning liquid supply pipe 41.

The recovery pipe 37 is provided so as to be connected to a lower portion of the entrance 19 (the lowermost lower end of the bottom of the main body 13). As a result, the cleaning liquid W dropped onto the bottom plate 18 from the dust collection electrode 17 is collected along the inclined surface of the bottom plate 18 toward the collection pipe 37. The collection pipe 37 is provided with an open / close valve 43 that is opened only during the cleaning operation.
Is connected to the separation tank 38 via the

The separation tank 38 is a tank for separating oil and solid matter from the cleaning liquid W. This separation tank 38
The inside is partitioned by two partition plates 44. The two partition plates 44 allow only the cleaning liquid W to pass therethrough, so that oil and solids are separated and precipitated.

The cleaning liquid supply pump 39 includes a separation tank 38.
And a pump for supplying the cleaning liquid W to the cleaning liquid passage 33 after the oil and solids are separated.

The cleaning liquid supply pipe 40 is connected to the cleaning liquid supply pump 3.
9 and the cleaning liquid supply pipe 41 are connected to each other, and the cleaning liquid W from the cleaning liquid supply pump 39 is supplied to the cleaning liquid supply pipe 4.
1 is supplied. Cleaning liquid supply pipe 41
Correspond to the four support plates 28 of the load electrode support 26.
And four load electrode portions 2 supported by each support plate 28.
5 is connected via a joint 45. Each cleaning liquid supply pipe 41 is connected to the cleaning liquid supply pipe 40 via four open / close valves 46.

[Operation] The electric precipitator 11 having the above-described structure includes:
Air containing dust flows into the inflow space 20 from the inlet 19. The air that has flowed into the inflow space 20 depends on each of the dust collection electrodes 1.
7, and is discharged to the outside from the upper outlet 21. When air passes through the dust collecting electrode 17, dust in the air is discharged from the discharge electrode 1.
4 is charged by the discharge needle 24. The charged dust rises in the dust collecting electrode 17 as it is. At this time, the charged electrode unit 25 pushes the dust toward the dust collecting electrode 17 by the electric field formed between the dust collecting electrode 17 and the dust collecting electrode 17. Dust is adsorbed to the pole 17. The air after the dust is collected rises as it is and is discharged to the outside.

On the other hand, when a large amount of dust adheres to the inner wall of the dust collecting electrode 17, the cleaning operation is performed as follows.

First, the operation of the electric dust collector 11 is stopped.
The operation may be performed without stopping the operation. In this case, an oil having excellent insulating properties is used as the cleaning liquid W.

Next, the opening / closing valves 43 and 46 are opened, and the cleaning liquid supply pump 39 is operated. As a result, the cleaning liquid W in the separation tank 38 is supplied to the cleaning liquid passage 33 of the charged electrode unit 25 via the cleaning liquid supply pipe 40 and the cleaning liquid supply pipe 41. Further, the cleaning liquid W is supplied to the cleaning liquid passage 33.
Is sprayed from the nozzle 34 for spraying the cleaning liquid toward the periphery thereof. The sprayed cleaning liquid W is evenly sprayed on the inner wall of the dust collecting electrode 17 and flows downward on the surface thereof. At this time, the cleaning liquid W is washed off while removing dust adhering to the dust collecting electrode 17 and falls together with the bottom plate 18. The cleaning liquid W that has dropped onto the bottom plate 18 is collected in a separation tank 38 via a collection pipe 37.

In the separation tank 38, oil and solids are separated from the cleaning liquid W, and only the cleaning liquid W is supplied again to the cleaning liquid spray nozzle 34 by the cleaning liquid supply pump 39.

As a result, the cleaning liquid W is continuously sprayed from the cleaning liquid spray nozzle 34 onto the inner wall of the dust collecting electrode 17, and the cleaning operation is completed when all the attached dust is washed away. The cleaning liquid supply pump 39 is stopped, and each open / close valve 4
3 and 46 are closed, and the operation of the electric dust collector 11 is restarted.

[Effect] As described above, the electrode cleaning mechanism 12
Since the part located in the dust collecting electrode 17 is incorporated in the existing device (the charged electrode unit 25), the member and the like of the existing electric dust collector 11 are not changed, and That is, the cleaning liquid spray nozzle 34 can be configured to be horizontal without impairing the function of the electric dust collector 11. As a result, the cleaning liquid W can be sprayed at a substantially right angle to the dust collecting electrode 17, and the efficiency of the cleaning operation can be greatly improved.

[Modifications] (1) In the above-described embodiment, the air passage is constituted by the square cylindrical dust collecting electrode 17 divided into 16, but the air passage may be constituted by concentric electrodes. Good. That is, the discharge electrode and the dust collection electrode are formed in a circular or polygonal cylindrical shape and are prepared in plurals with different dimensions, and they are arranged alternately and multiple concentrically to form the dust collection electrode. You may comprise. In this case, the same operation and effect as those of the above embodiment can be obtained.

(2) In the above embodiment, the discharge needles 24 are provided at the tip of the charged electrode portion 25, but a large number of small barbed discharge needles may be provided around the charged electrode portion 25. In this case, the same operation and effect as those of the above embodiment can be obtained.

(3) In the above embodiment, the cleaning liquid passage 3
Although 3 is provided in the charge electrode unit 25, it may be provided on the surface of the charge electrode unit 25 as long as the function of the charge electrode unit 25 is not hindered. Further, in the case of the concentric electrode of the modification (1), it may be similarly provided on the surface of the electrode.

(4) In the above embodiment, a large number of cleaning liquid spray nozzles 34 are provided around the charged electrode section 25, but a small number or only one nozzle may be provided. That is, even if one or a small number of cleaning liquid spray nozzles 34 are provided within a range where the cleaning liquid can be efficiently sprayed over the entire area of the dust collecting electrode 17, the same operation and effect as in the above embodiment can be obtained.

(5) In the above embodiment, the cleaning liquid spray nozzle 34 is constituted by the small holes 34A provided around the charged electrode portion 25, but may be constituted by a separate nozzle connected to the cleaning liquid passage 33. Good. In this case, the same operation and effect as those of the above embodiment can be obtained.

[0044]

As described in detail above, according to the present invention,
The following effects are obtained.

Since the cleaning liquid passage is provided by using the discharge electrode constituting the electrode cleaning mechanism, the cleaning liquid spray nozzle can be configured in a horizontal direction without impairing the function of the existing electric dust collector. As a result, the cleaning liquid can be sprayed at an almost right angle to the dust collection electrode, and the working efficiency of the cleaning operation can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an electric precipitator according to the present invention and an electrode cleaning mechanism incorporated therein.

FIG. 2 is a perspective view of a main part showing an example of an electrode cleaning mechanism of a conventional electric precipitator.

FIG. 3 is a schematic configuration diagram showing another example of an electrode cleaning mechanism of a conventional electric precipitator.

FIG. 4 is a plan view showing an electric precipitator according to the present invention.

FIG. 5 is a schematic bottom view showing the electric precipitator according to the present invention.

FIG. 6 is a sectional view of a main part showing a charged electrode part of the electrode cleaning mechanism for an electrostatic precipitator according to the present invention.

FIG. 7 is a main part side view showing a charged electrode portion of the electrode cleaning mechanism for an electrostatic precipitator according to the present invention.

8 is a plan view showing the arrangement of the cleaning liquid spray nozzles at the first stage of the load electrode section of FIG. 6;

FIG. 9 is a plan view showing an arrangement of cleaning liquid spray nozzles in another stage of the load electrode section of FIG. 6;

[Explanation of symbols]

11: electric dust collector, 12: electrode cleaning mechanism, 13: body,
14: discharge electrode, 17: dust collecting electrode, 18: bottom plate, 19: inlet, 20: inflow space, 22: discharge electrode receiving portion, 24: discharge needle, 25: charged electrode portion, 26: charged electrode support portion, 28 : Support plate, 29: insulator, 31: connection plug, 33: cleaning liquid passage, 34: nozzle for cleaning liquid spray, 34A: small hole, 35:
Cleaning liquid supply system, 37: recovery pipe, 38: separation tank,
39: cleaning liquid supply pump, 40: cleaning liquid supply pipe, 41:
Cleaning liquid supply pipe, 43, 46: open / close valve, 45: joint, W: cleaning liquid.

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Takahiro Konno 1-37 Kuretsutsumi, Hiratsuka-shi, Kanagawa Japan Air Filter Co., Ltd.

Claims (2)

[Claims] 1. An electrostatic precipitator comprising: a discharge electrode for charging dust; and a dust collection electrode for electrically attracting and collecting the dust charged by the discharge electrode. A washing liquid passage through which the dust collecting electrode washing liquid is passed; and one or more washing liquid spray nozzles for spraying the dust collecting electrode washing liquid from the washing liquid passage toward the opposing dust collecting electrode; and A cleaning liquid supply system for supplying the cleaning liquid to the cleaning liquid passage and collecting and circulating the cleaning liquid sprayed from the cleaning liquid spray nozzle onto the dust collecting electrode. . 2. The electrode cleaning mechanism for an electric dust collector according to claim 1, wherein the dust collecting electrode is formed in a cylindrical shape, and the discharge electrode is inserted into the cylindrical dust collecting electrode to discharge electricity. And a hollow rod-shaped charge electrode portion that supports the discharge needle in a state of being inserted into the cylindrical dust collection electrode, wherein the cleaning liquid passage is formed of the hollow rod-shaped charge electrode. An electrode cleaning mechanism for an electrostatic precipitator, wherein the cleaning liquid spray nozzle is constituted by a small hole provided on the outer periphery of the hollow rod-shaped charged electrode section.