JPH10165840A - Washing device for dry electrostatic dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unnecessitate manual work for cleaning and to reduce the amount of used washing liquid by installing water tubes in the vertical direction along dust collecting electrode plates provided with rotary atomizers for feeding washing liquid so that washing with water may be performed over a wide range for cleaning a dry electrostatic precipitator. SOLUTION: Vertical water tubes 26 are arranged opposite to the electrode plate side edge parts of dust collecting electrode units 14 arranged parallel to a gas flow passage and in parallel along the clearances between the dust collecting electrode plates in parallel. Such vertical tubes 26 each are fitted with plural rotary atomizers 32 at vertical intervals to spray washing liquid along each dust collecting electrode plate surface of the dust collecting electrode unit 14. Besides, plural horizontal water tubes 46 positioned above the dust collecting electrode units 14 are arranged along the direction crossing the gas flow passage and are each provided with spray nozzles 44 for spraying washing water toward at least the dust collecting electrode units 14 below. In this way, since the inside is washed over a wide area, cleaning by washing by handwork is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning apparatus for a dry electric precipitator, and more particularly to a cleaning apparatus for cleaning dust collected by a dry electric precipitator and adhering to a dust collecting electrode by washing with water.

[0002]

2. Description of the Related Art A dry electric precipitator has a plurality of sets of a precipitating electrode unit in which a net discharge electrode and a flat precipitating electrode are alternately arranged in parallel in a casing forming a gas flow path. Dust is collected by the dust collection electrode when gas is passed between the collection electrodes. In such a dry electric precipitator,
In order to perform inspection work and repair work, the inside of the dust collector needs to be periodically washed (usually once or twice a year) with water.

Conventionally, a fixed-type water washing device is installed for the purpose of washing the electrodes, but the other parts are mostly washed by water manually. The specific contents will be described with reference to FIGS. 7 to 9 show a conventional cleaning device for a dry type electrostatic precipitator, FIG. 7 is a longitudinal sectional view along a gas flow path of a general dry type electric precipitator, and FIG. 8 is disposed above an electrode plate. FIG. 9 shows the equipment for cleaning the bottom plate of the porcelain tube chamber and the upper frame of the discharge frame in the upper part of the dust collecting electrode plate, in particular, in the range of the electrode entrance, between the electrodes, and in the range of the electrode outlet. . As shown in FIG. 8, in order to clean the dust collecting electrode plate, a direction perpendicular to the gas flow path is provided above the dust collecting electrode plate 1 and in a direction crossing the gap between the electrode plates 1. The horizontal water pipe 2 is fixedly disposed, and a plurality of nozzles 3A are branched so that the cleaning liquid can be sprayed toward the lower electrode plate 1 so that the cleaning is performed from above the electrode plate 1. Further, a ceiling washing nozzle 3B is provided on the upper surface of the horizontal water pipe 2 so that the washing liquid is sprayed toward the ceiling surface of the dust collector casing. Further, a horizontal water pipe 8 is disposed in the electrode inlet area 4, the electrode area 5 and the electrode outlet area 6 in the casing, and also at a position directly below the insulator chamber 7, and the gap between the side electrode plates 1 is also provided. In addition, a nozzle 3C for cleaning the bottom plate of the insulator tube chamber is provided to wash the bottom plate of the insulator tube room and the upper frame of the discharge frame. In addition, there has been proposed a structure in which a water pipe is rotated by a washing apparatus having a structure using the fixed water pipes 2 and 8 described above (Japanese Patent Laid-Open No. 6-31).
No. 202, 6-343899).

[0004]

However, in the above-described conventional cleaning device for a dry electric precipitator, a large amount of cleaning liquid is sprayed from the upper portion of the precipitating electrode plate, and dirt is washed away by the cleaning water flowing down the electrode plate surface. However, the lower area of the electrode plate cannot be substantially washed. Particularly, the dust collecting electrode plate corresponding to the electrode entrance area 4, the interelectrode area 5, and the electrode exit area 6 is washed with water by hand washing. That is the current situation. This hand-washing method employs a method in which a fire hose is brought in from a manhole installed in a dry electric dust collector and the hose is washed.

[0005] Such a dry electric dust collector requires about four days of cleaning work by hand, and furthermore, it becomes a very dirty work, so there is a shortage of workers, a large labor cost is required, and a scaffold is installed for safety measures. There are drawbacks such as costly and dangerous work. Against this background, there is a demand for a processing method that minimizes the manual washing operation.

The present invention has been made in view of such circumstances, and has as its object to provide a cleaning device for the inside of a dry-type electrostatic precipitator, which does not require a manual operation for cleaning the inside of the dry-type electric precipitator. I do. It is another object of the present invention to provide a cleaning apparatus capable of achieving an efficient cleaning effect by reducing the amount of a cleaning liquid used.

[0007]

In order to achieve the above object, the present invention provides a water pipe for supplying a cleaning liquid in a vertical and vertical direction along a dust collecting electrode plate so that a wide range of water can be washed for cleaning of a dry type electric dust collector. It has been obtained based on the knowledge that it is possible to efficiently perform cleaning with a small amount of cleaning liquid over a wide area by installing and installing a rotary sprayer.

That is, the cleaning device for a dry type electrostatic precipitator according to the present invention is a device for cleaning the inside of the dry type electric precipitator, which faces a side edge portion of a dust collecting electrode unit arranged in parallel with a gas flow path. A plurality of vertical water pipes are arranged at intervals along the transverse direction of the gas flow path, and a plurality of rotary sprayers are attached to the vertical water pipe. In this case, the rotary sprayer is rotatably attached to a nozzle header that branches into the vertical water pipe, and a nozzle main pipe that allows the cleaning liquid to be introduced therein, and a spray direction that is extended to a rotation locus about the nozzle main pipe as a center. A spray nozzle directed in a rotational tangential direction, and the nozzle main pipe may be rotatable by a spray pressure from the spray nozzle.

More specifically, the present invention relates to a device for cleaning the inside of a dry-type electrostatic precipitator, wherein an upper edge of a dust-collecting electrode unit arranged in parallel with the gas flow path extends in a direction crossing the gas flow path. A plurality of horizontal water pipes are disposed along the horizontal water pipe, and a spray nozzle for spraying the cleaning liquid at least toward the dust collection electrode side is provided on the horizontal water pipe, and the gas flow path is traversed facing the side edge of the dust collection electrode unit. A plurality of vertical water pipes are arranged at intervals along the direction, a plurality of rotary sprayers are attached to the vertical water pipe, and the rotary sprayer is rotatably attached to a nozzle header branched to the vertical water pipe, and a cleaning liquid is internally provided. A nozzle main pipe capable of conducting water, and a spray nozzle extending to a rotation locus about the nozzle main pipe and having a spray direction directed to a rotational tangent direction, The mist pressure, characterized in that occupies possibly rotating said nozzle main pipe. A horizontal nozzle that sprays the nozzle main pipe from above and below the nozzle header and attaches a spray nozzle to each of the protruding ends, and the spray nozzle at each end sprays to the side of the nozzle main pipe,
What is necessary is just to comprise the inclined nozzle etc. which spray in the direction which forms an acute angle with the extension of the nozzle main pipe, and make the whole circumference of the nozzle header the spray area.

[0010]

According to the above construction, the vertical water pipes are arranged at intervals in the direction crossing the gas flow path substantially in the electrode inlet area, the electrode area, and the electrode outlet area, and are arranged in the pipe axial direction ( A plurality of rotary atomizers will be arranged in the vertical direction. As a result, the spray cleaning liquid from the rotary sprayer is sprayed from the side edges to the entire range of the upper and lower regions from the upper part to the lower part of the dust collecting electrode plate, so that the conventional manual cleaning area can be automatically cleaned. In a rotary sprayer, the spray direction from the spray nozzle is directed at least in the rotation tangent direction of the rotation locus around the nozzle main pipe, and the spray direction is rotated by the water pressure from the vertical water pipe, so that special rotation driving means is provided. The cleaning liquid can be sprayed onto the dust collecting electrode plate to be cleaned around the rotary sprayer without the need for cleaning. As a result, it is not necessary to flow a large amount of the cleaning liquid from the upper side, and the entirety of the dust collection electrode in a wide range from a high position to a low position can be efficiently cleaned by using a small amount of water.

Further, in addition to the above configuration, by providing a horizontal water pipe similar to the conventional one in the upper region of the casing,
A more efficient cleaning effect can be obtained by performing a spray operation with a low water amount from the upper region of the dust collecting electrode plate. Furthermore,
A nozzle main pipe rotatably attached to a nozzle header branched from a vertical water pipe with a rotary atomizer protrudes from the top and bottom of the header, and a swirling nozzle portion is formed at the protruding end, so that the entire periphery of the header is a spray area, The cleaning liquid mist from the spray nozzle can reach the entire area of the dust collecting electrode plate, and the cleaning effect can be enhanced to the extent that manual cleaning using a hose can be omitted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of a cleaning apparatus for a dry electric precipitator according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of an essential part showing an arrangement of a cleaning device according to an embodiment, and FIGS. 4 to 6 show an overall configuration in which the cleaning device is incorporated in a dry electric dust collector.

The dry type electrostatic precipitator 10 includes a casing 12 in which a plurality of sets of dust collecting electrode units 14 in which a net-shaped discharge electrode and a plate-shaped dust collecting electrode are alternately arranged in parallel are arranged, and gas is supplied between the electrode plates. Dust is collected at the collection electrode when it is distributed. The gas is supplied to the inlet flue 16 of the casing 12.
And flows through the gap between the electrodes of the dust collection electrode unit 14 and flows into the outlet flue 18.

In such a dry electric precipitator 10,
In particular, a plurality of vertical water pipes 26 are arranged at intervals along the casing width direction crossing the gas flow path in the electrode entrance area 20, the interelectrode area 22, and the electrode exit area 24. Therefore, the vertical water pipe 26 faces the electrode plate side edge of the dust collection electrode unit 14 arranged in parallel with the gas flow path, and is arranged in parallel along the gap between the dust collection electrode plates. Such a vertical water pipe 26 is connected to the dust collection electrode unit 14.
And the upper end thereof is connected to the collecting pipe 28 so that washing water can be supplied to the entire vertical water pipe 26. Further, the lower end of the vertical water pipe 26 is connected to a drainage pipe 30 for draining, so that the internal cleaning water can be removed from the vertical water pipe 26 after the cleaning operation.

A plurality of rotary atomizers 32 are attached to the vertical water pipe 26 at intervals above and below, so that the cleaning liquid can be sprayed along each of the dust collecting electrode plate surfaces of the dust collecting electrode unit 14. I have. The specific structure of the rotary sprayer 32 is shown in FIGS. A branch pipe 34 is provided in the vertical water pipe 26, and a nozzle header 36 is attached to a tip of the branch pipe 34. The nozzle header 36 is formed in the shape of a cylindrical container, and forms a T-shape with the branch pipe 34 to form the vertical water pipe 2.
6 so that the center line of the cylindrical header is parallel to the pipe axis of the vertical water pipe 26. A nozzle main pipe 38 is attached to such a nozzle header 36 in a vertically penetrating state so as to be concentric with the header center line. Further, the nozzle main pipe 38 is rotatably supported by upper and lower header end plates 36A, 36A so as to be able to rotate around its axis. The boss 36 formed on the header end plate 36A is supported for rotation.
B and 36B are passed through the nozzle main pipe 38, and the boss 36B,
A pair of collars 38A, 38A contacting the outer end surface of 36B.
Is fixed to the nozzle main pipe 38. Therefore, the nozzle main pipe 38 is prevented from coming off from the nozzle header 36 by the collars 38A, 38A, and the bosses 36B,
The seal is water-sealed by the packings 40, 40 sent between the seals 36B and 36B. The nozzle main pipe 38 located inside the nozzle header 36 has a bulged inner diameter, and a plurality of water guide holes 42 penetrate therethrough. Therefore, the washing water from the vertical water pipe 26 is once introduced into the nozzle header 36 and supplied to the inside of the nozzle main pipe 38 through the water introduction hole 42.

The nozzle main pipe 38 protrudes vertically from the nozzle header 36 as described above. The protruding end of the nozzle main pipe 38 extends to a rotational locus about the nozzle main pipe 38, and the spray direction is the rotational tangential direction. Is provided, and the spray nozzle 44 is provided.
The nozzle main pipe 38 can rotate by the spray pressure from the nozzle.

Here, a spray nozzle 44 attached to each end of the nozzle main pipe 38 is a pair of horizontal nozzles 44A, 44A extending in the radial direction of the nozzle main pipe 38.
And an inclined nozzle 44B directed at a direction that forms an acute angle with the extension of the nozzle main pipe 38, specifically, at an angle of 45 degrees. The pair of horizontal nozzles 44A, 44A are arranged along the diameter direction of the nozzle main pipe 38, the spray direction from the nozzle injection hole at the tip is the tangential direction of the rotating circular locus, and the spray pressure is It is oriented to give power. Accordingly, the spray area is set to be the entire circumference of the side of the nozzle header 36 while the nozzle main pipe 38 rotates by the spray pressure from the horizontal nozzles 44A. Further, the tip of the inclined nozzle 44B is rotated with the rotation of the nozzle main pipe 38, and the tip nozzle is swung through the tip injection hole according to the inclination angle. Since the spray nozzles 44 located above and below the nozzle header 36 are provided in the common nozzle main pipe 38, the directions of the nozzle injection holes are set so that the rotational couples caused by the spray pressures of the upper and lower nozzles match. I have. For this reason, the nozzle main pipe 38 rotates in one direction by the spray pressure from any of the spray nozzles 44 (44A, 44B). As shown in FIG. The entire circumference is a spray area.

A plurality of rotary atomizers 32 having such spray nozzles 44 are attached to the vertical water pipe 26. The interval may be set so that the spray area overlaps. The interval may be set in accordance with the nozzle capacity so that there is no non-cleaning area.

As shown in FIG. 1, the cleaning device having the vertical water pipe 26 is located above the dust collecting electrode unit 14 and extends along the gas flow path. A plurality of horizontal water pipes 46 are provided,
Is provided with a spray nozzle 48 for spraying the cleaning water at least toward the lower side where the dust collecting electrode unit 14 is located. As a result, the cleaning water supplied through the vertical water pipe 26 is cleaned by the rotary sprayer 32 provided at appropriate intervals in the up-down direction, and the cleaning operation by spraying from above, which is the same as the conventional case, is performed. The internal cleaning of 10 can be completely automated.

According to such an embodiment, the vertical water pipe 26
The horizontal nozzles 44A, 44A are designed so that the spray nozzle 44 is automatically rotated by a washing pressure (usually ^{2 to} 7 kgG / cm ² ) from the upper region to the lower region on the side edge side of the dust collecting electrode unit 14. , As well as the inclined nozzle 44B, it is possible to directly clean almost all the dust collecting electrode plates located therearound from the upper part to the lower part,
This makes it possible to clean the interior of the dry electric dust collector 10 over a wide area, and eliminates manual water washing work by a person as in the related art. In particular, by using the conventional horizontal water pipe 46 in combination with the spray nozzle 48 provided therein, the cleaning operation time can be reduced, and the amount of cleaning water used can be significantly reduced.

[0021]

As described above, according to the present invention, since the rotary sprayer is installed at each part in the vertical direction of the dust collecting electrode unit, the inside can be cleaned in a wide range. It becomes unnecessary. In addition, as a result, dirty work and dangerous work can be eliminated, and labor costs can be significantly reduced. Further, since the washing efficiency is high, the washing operation can be performed in a short time, and the amount of water used can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a cleaning device for a dry electric precipitator according to an embodiment.

FIG. 2 is a front view and a plan view of the rotary sprayer according to the present embodiment.

FIG. 3 is an explanatory perspective view of a cleaning area by the rotary sprayer.

FIG. 4 is a longitudinal sectional view of a dry type electrostatic precipitator provided with the cleaning device according to the embodiment.

FIG. 5 is a sectional plan view of the same.

FIG. 6 is a transverse sectional view of the same.

FIG. 7 is a longitudinal sectional view of a dry type electrostatic precipitator provided with a conventional cleaning device.

FIG. 8 is a perspective view of an electrode plate cleaning unit of a conventional cleaning device.

FIG. 9 is an explanatory perspective view of a conventional cleaning device between a dust collector entrance and a dust collecting electrode unit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Dry electric dust collector 12 Casing 14 Dust collecting electrode unit 16 Inlet flue 18 Outlet flue 20 Electrode inlet range 22 Interelectrode range 24 Electrode outlet range 26 Vertical water pipe 28 Collective pipe 30 Drainage collecting pipe 32 Rotary sprayer 34 Branch pipe 36 Nozzle header 36A Header end plate 36B Boss 38 Nozzle main pipe 38A Collar 40 Packing 42 Water guide hole 44 Spray nozzle 44A Horizontal nozzle 44B Inclined nozzle 46 Horizontal water pipe 48 Spray nozzle

Claims (4)

[Claims] An apparatus for cleaning the inside of a dry type electrostatic precipitator, which is opposed to a side edge of a dust collecting electrode unit arranged in parallel with a gas flow path and is spaced along a transverse direction of the gas flow path. A plurality of vertical water pipes, and a plurality of rotary sprayers attached to the vertical water pipes. 2. The nozzle according to claim 1, wherein the rotary sprayer is rotatably mounted on a nozzle header that branches into the vertical water pipe, and the nozzle main pipe is configured to guide a cleaning liquid therein. 2. A cleaning device for a dry-type electrostatic precipitator according to claim 1, further comprising: a spray nozzle directed in a rotational tangential direction, wherein said nozzle main pipe is rotatable by a spray pressure from said spray nozzle. apparatus. 3. An apparatus for cleaning the inside of a dry electric precipitator, comprising a plurality of horizontal water pipes extending along a direction crossing the gas flow path at an upper edge of a dust collection electrode unit arranged in parallel with the gas flow path. The horizontal water pipe is provided with a spray nozzle for spraying the cleaning liquid toward at least the dust collecting electrode side, and the space is provided along the transverse direction of the gas flow path facing the side edge of the dust collecting electrode unit. A plurality of vertical water pipes are disposed in the vertical water pipe, and a plurality of rotary sprayers are attached to the vertical water pipe, and the rotary sprayer is rotatably mounted on a nozzle header that branches to the vertical water pipe, and is a nozzle main pipe that can guide a cleaning liquid therein. And a spray nozzle extending to a rotation locus about the nozzle main pipe and having a spray direction directed to a rotational tangent direction. A cleaning device for a dry electric precipitator, characterized in that the main pipe is rotatable. 4. The nozzle main pipe protrudes from above and below the nozzle header, and a spray nozzle is attached to each protruding end of the nozzle header. Each of the spray nozzles at each end has a horizontal nozzle that sprays to the side of the nozzle main pipe; The cleaning device for a dry electrostatic precipitator according to claim 2 or 3, further comprising an inclined nozzle that sprays in a direction that forms an acute angle with an extension of the nozzle header, and the entire periphery of the nozzle header is a spray area. .