JP3544273B2 - Cleaning equipment for dry electric precipitators - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device for a dry electric precipitator, and more particularly to a cleaning device for cleaning dust collected by a dry electric precipitator and attached to a dust collecting electrode by washing with water.
[0002]
[Prior art]
The dry-type electrostatic precipitator is provided with a plurality of sets of dust collecting electrode units in which a net-shaped discharge electrode and a plate-shaped dust collecting electrode are alternately arranged in parallel in a casing forming a gas flow path, and the gas is collected by the dust collecting electrode. Dust is collected by the dust collection electrode when it is distributed between them. In such a dry electric dust collector, the inside of the dust collector needs to be periodically washed (usually once or twice a year) with water in order to perform inspection work and repair work.
[0003]
Conventionally, a fixed type water washing apparatus is installed for the purpose of washing the electrodes, but most of the other parts are manually washed with water. 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. FIG. 9 shows the cleaning equipment for the bottom plate of the insulator tube chamber and the upper frame of the discharge frame in the upper part of the dust collecting electrode plate, particularly in the electrode entrance area, the interelectrode area, and the electrode exit area. . As shown in FIG. 8, in order to clean the dust collecting electrode plate, in a direction perpendicular to the gas flow path and in a direction crossing the gap between the electrode plates 1 on the dust collecting electrode plate 1. The horizontal water pipe 2 is fixedly provided, 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 horizontal water pipe 2 is washed 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 casing at an electrode entrance range 4, an interelectrode range 5, and an electrode exit range 6, and also at a position directly below the porcelain tube chamber 7. A nozzle 3C for cleaning the bottom plate of the insulator tube chamber is provided to clean the bottom plate of the insulator tube chamber and the upper frame of the discharge frame.
Further, there has been proposed a structure in which a water pipe is rotated by a cleaning apparatus having the above-mentioned structure using the fixed water pipes 2 and 8 (Japanese Patent Application Laid-Open Nos. 6-31202 and 6-343899).
[0004]
[Problems to be solved by the invention]
However, in the conventional cleaning device for a dry electric dust collector, a large amount of cleaning liquid is sprayed from the upper portion of the dust collecting electrode plate, and dirt is washed off by cleaning water flowing down the electrode plate surface. The lower area of the plate cannot be washed, and especially the dust collecting electrode plate corresponding to the electrode entrance area 4, the interelectrode area 5, and the electrode exit area 6 is currently washed with water by hand washing. 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]
It takes about 4 days for manual cleaning work of such a dry type electrostatic precipitator, and furthermore, it becomes a very dirty work, so there is a shortage of workers, a large labor cost, and safety measures also require the installation of a scaffold, etc. There is a disadvantage that it takes time and is dangerous work. Against this background, there is a demand for a treatment method that minimizes the manual washing operation.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is 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. Another object of the present invention is to provide a cleaning apparatus capable of achieving an efficient cleaning effect by reducing the amount of a cleaning liquid used.
[0007]
[Means for Solving the Problems]
According to the present invention, in order to achieve the above object, a water pipe for supplying a cleaning liquid is installed vertically and vertically along a dust collecting electrode plate, and a rotary sprayer is installed on the water pipe so that a wide range of water can be washed for cleaning of a dry electric dust collector. By doing so, it was obtained based on the finding that washing can be efficiently performed with a small amount of washing solution over a wide range.
[0008]
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 electrostatic precipitator, and is erected in parallel with the gas flow path and spaced apart along the transverse direction of the gas flow path. A plurality of vertical water pipes are arranged at intervals along the transverse direction of the gas flow path facing the side edge of the dust collection electrode unit composed of a plurality of dust collection electrode plates arranged in parallel with each other. It is characterized by a plurality of rotary sprayers attached to the water pipe. In this case, the rotary atomizer is rotatably attached to a nozzle header that branches into the vertical water pipe, and is provided at a tip end of the nozzle main pipe 38 so as to be able to guide the cleaning liquid therein. A spray nozzle in which the direction of spray from the hole is tangential to the rotation circular locus and the spray pressure is directed in a direction that gives a couple to the nozzle main pipe 38. What is necessary is just to make the said nozzle main pipe rotatable by pressure.
[0009]
More specifically, the present invention relates to a device for cleaning the inside of a dry electric precipitator, which is erected in parallel with a gas flow path and is arranged in parallel with each other at intervals along a transverse direction of the gas flow path. A plurality of horizontal water pipes are arranged at intervals along the gas flow direction facing the upper edge of the dust collection electrode unit composed of the plurality of dust collection electrode plates , and at least the dust collection electrode plate is provided on the horizontal water pipe. Along with providing a spray nozzle for spraying the cleaning liquid toward, a plurality of vertical water pipes are arranged at intervals along the transverse direction of the gas flow path facing the side edge of the dust collecting electrode unit, and the vertical water pipe is provided. multiple mounting the rotary atomizer, a nozzle main which enables water guide the washing liquid inside the rotary atomizer rotatably mounted in the nozzle header to branch to the vertical water tube, spray nozzle disposed at the tip of the nozzle main pipe Comprising a result, the is characterized in that occupies possibly rotating said nozzle main by spray pressure from the spray nozzle. The nozzle main pipe is protruded from above and below the nozzle header, and a spray nozzle is attached to each of the protruding ends. The spray nozzle at each end is a horizontal nozzle spraying to the side of the nozzle main pipe, and an extension line of the nozzle main pipe and an acute angle. The nozzle region may be formed by an inclined nozzle or the like that sprays in the direction of, and the entire periphery of the nozzle header may be used as the spray region.
[0010]
[Action]
According to the above configuration, the vertical water pipes are arranged at intervals substantially in the direction crossing the gas flow path in the electrode inlet area, the electrode area, and the electrode outlet area, and are arranged in the pipe axis direction (vertical direction) of the vertical water pipe. Will be provided with a plurality of rotary sprayers. Thus, 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 the rotary sprayer, the spray direction from the spray nozzle is directed at least in the rotation tangent direction of the rotation trajectory centered on 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 on 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 whole of the dust collecting electrode in a wide range from a high position to a low position can be efficiently cleaned with a small amount of used water.
[0011]
In addition to the above configuration, by installing 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 of a small amount of water from the upper region of the dust collecting electrode plate. Can be
Furthermore, a nozzle main pipe rotatably attached to a nozzle header branched from a vertical water pipe with a rotary sprayer protrudes from above and below 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. Thereby, 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 increased to the extent that manual cleaning using a hose can be omitted.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of a cleaning device for a dry-type 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.
[0013]
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 to allow gas to flow between the electrode plates. Dust is collected at the collection electrode. The gas is introduced from the inlet flue 16 of the casing 12, flows through the gap between the electrodes of the dust collection electrode unit 14, and flows to the outlet flue 18.
[0014]
Inside such a dry electrostatic precipitator 10, a plurality of vertical water pipes 26 are provided at intervals along the casing width direction crossing the gas flow path, particularly in the electrode entrance area 20, the interelectrode area 22, and the electrode exit area 24. Are arranged. Therefore, the vertical water pipe 26 faces the electrode plate side edge of the dust collecting electrode unit 14 arranged in parallel with the gas flow path, and is disposed in parallel along the gap between the dust collecting electrode plates. Such a vertical water pipe 26 has a length that covers almost the entire height of the dust collection electrode unit 14, and an upper end thereof is connected to the collecting pipe 28 so that cleaning water can be supplied to the entire vertical water pipe 26. Further, the lower end of the vertical water pipe 26 is connected to the drainage pipe 30 for draining, so that the internal cleaning water can be removed from the vertical water pipe 26 after the cleaning operation.
[0015]
A plurality of rotary sprayers 32 are attached to such a vertical water pipe 26 at an interval above and below, so that the cleaning liquid can be sprayed along each dust collecting electrode plate surface of the dust collecting electrode unit 14. 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 a cylindrical container shape and is attached to the vertical water pipe 26 in a T shape together with the branch pipe 34 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 vertically attached to such a nozzle header 36 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. Rotational support is performed by passing the nozzle main pipe 38 through the bosses 36B, 36B formed on the header end plate 36A, and fixing the pair of collars 38A, 38A abutting on the outer end surfaces of the bosses 36B, 36B to the nozzle main pipe 38. I have. Therefore, the nozzle main pipe 38 is prevented from coming off from the nozzle header 36 by the collars 38A, 38A, and is sealed with the packings 40, 40 fed between the bosses 36B, 36B. The nozzle main pipe 38 located inside the nozzle header 36 has an expanded 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.
[0016]
The nozzle main pipe 38 protrudes vertically from the nozzle header 36 as described above, but at the protruding end, the spray path extends to a rotation locus about the nozzle main pipe 38 and the spray direction is directed in the rotational tangential direction. A spray nozzle 44 is provided, and the nozzle main pipe 38 can rotate by the spray pressure from the spray nozzle 44.
[0017]
Here, the spray nozzle 44 attached to each tip of the nozzle main pipe 38 has a pair of horizontal nozzles 44A, 44A extending in the radial direction of the nozzle main pipe 38, and a direction that forms an acute angle with the extension of the nozzle main pipe 38, specifically Specifically, it has an inclined nozzle 44B oriented at an angle of 45 degrees. The pair of horizontal nozzles 44A, 44A are arranged along the diametric direction of the nozzle main pipe 38, the spray direction from the nozzle injection hole at the tip is the tangential direction of the rotation circular locus, and the spray pressure is applied to the nozzle main pipe 38. It is oriented in the direction that gives power. Thus, 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, 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.
[0018]
A plurality of rotary sprayers 32 having such spray nozzles 44 are attached to the vertical water pipe 26. The interval may be set so that the spray area wraps. What is necessary is just to set so that there may be no non-wash area | region according to capability.
[0019]
In addition, as shown in FIG. 1, the cleaning device having the vertical water pipe 26 includes a plurality of horizontal water pipes located in the upper part of the dust collection electrode unit 14 along the direction traversing the gas flow path. A water pipe 46 is provided, and a spray nozzle 48 for spraying the cleaning water is provided on the horizontal water pipe 46 at least toward the lower side where the dust collection 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 vertical direction, and the cleaning operation by spraying from above, as in the related art, is performed. The internal cleaning of 10 can be completely automated.
[0020]
According to such an embodiment, the vertical water pipe 26 is targeted from the upper region to the lower region on the side edge side of the dust collection electrode unit 14, and the spray nozzle 44 is set to the rinsing pressure (typically, ^{2 to} 7 kgG / cm ² ). Since the horizontal nozzles 44A and 44A and the inclined nozzle 44B are arranged so as to rotate automatically, almost all of the dust collecting electrode plates located around the horizontal nozzles can be directly cleaned from the upper part to the lower part. It is possible to clean the inside of the dry electric precipitator 10 over a wide area, and a manual water washing operation by a person as in the related art is eliminated. In particular, by using the conventional horizontal water pipe 46 in combination with the spray nozzle 48 provided thereon, the cleaning operation time can be reduced, and the amount of cleaning water used can be significantly reduced.
[0021]
【The invention's effect】
As described above, according to the present invention, the rotary sprayer is installed at each part in the vertical direction of the dust collection electrode unit, so that the inside can be cleaned in a wide range, so that manual water cleaning is 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 apparatus 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 vertical sectional view of a dry electric 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 vertical cross-sectional view of a dry electric 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 collection 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 entrance range 22 Interelectrode range 24 Electrode exit range 26 Vertical water pipe 28 Collective pipe 30 Drainage collective 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)

A device for cleaning the inside of a dry electric precipitator, comprising a plurality of dust collecting electrode plates which are erected in parallel with a gas flow path and arranged in parallel with each other at intervals along a transverse direction of the gas flow path. A plurality of vertical water pipes are arranged at intervals along the transverse direction of the gas flow path facing the side edge of the dust collection electrode unit, and a plurality of rotary sprayers are attached to the vertical water pipe. Cleaning device for electric dust collector. The rotary sprayer is rotatably attached to a nozzle header that branches to the vertical water pipe, and is rotatably attached to the nozzle main pipe, which is capable of introducing a cleaning liquid therein. The rotary sprayer is disposed at the tip of the nozzle main pipe 38 , and sprays from a nozzle injection hole at the tip. A spray nozzle whose direction is a tangential direction of the rotating circular locus and whose spray pressure is directed in a direction to give a couple to the nozzle main pipe 38, and the spray pressure from the spray nozzle The cleaning device for a dry electric precipitator according to claim 1, wherein the main pipe is rotatable. A device for cleaning the inside of a dry electric dust collector, comprising a plurality of dust collecting electrode plates which are erected in parallel with a gas flow path and are arranged in parallel with each other at intervals along a transverse direction of the gas flow path. A spray nozzle for disposing a plurality of horizontal water pipes facing the upper edge portion of the dust collection electrode unit at intervals along the gas flow direction, and spraying the cleaning liquid on the horizontal water pipe at least toward the dust collection electrode plate. And a plurality of vertical water pipes are arranged at intervals along the transverse direction of the gas flow path facing the side edge of the dust collection electrode unit, and a plurality of rotary sprayers are attached to the vertical water pipe, sprayer will be provided with a nozzle main pipe was a washing liquid inside can water guide rotatably mounted to the nozzle header to branch to the vertical water tube, and a spray nozzle disposed at the tip of the nozzle main pipe, the Cleaning device for a dry electrostatic precipitator by spray pressure from playing the nozzle, characterized in that occupies possibly rotating said nozzle main pipe. The nozzle main pipe protrudes from above and below the nozzle header, and a spray nozzle is attached to each of the protruding ends thereof. The spray nozzle at each end has a horizontal nozzle spraying to the side of the nozzle main pipe, an extension line of the nozzle main pipe and an acute angle. The cleaning device for a dry electrostatic precipitator according to claim 2, further comprising: an inclined nozzle that sprays in a direction in which the nozzle header is formed, wherein the entire periphery of the nozzle header is a spray area.

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