JPH09141133A - Apparatus and method for regenerating electric precipitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus having a structure wherein the power of jet air streams is reduced on the way in the gaps between electrode plates during the regeneration of an elective precipitator and is set to a system not generating parts against which jet streams impinge and not requiring large blow equipment. SOLUTION: In a dust extractor wherein an electric precipitator is arranged to block a dust-containing air passage and a reversibly taken up strip like filter is arranged on the downstream side thereof, the electric precipitator of the dust extractor is regenerated by allowing a header 53 having a large number of jet nozzles 54 and provided in a vertical direction to face to electrode plates A and shaking off the dust collectively bonded and accumulated to the electrode plates A by compressed air injected from jet nozzles 54 while moving the header 53 horizontally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerating apparatus and a regenerating method for an electrostatic precipitator used, for example, in a tunnel of an automobile road.

[0002]

2. Description of the Related Art Conventionally, as a reproducing apparatus for the above-mentioned electrostatic precipitator, the one described in JP-A-59-150558 is known. In this device, as shown in FIG. 4, a header 103 with a spray nozzle is provided orthogonal to the electrode plate 101 arranged vertically in the electrostatic precipitator, and is maintained in the horizontal direction. The header 103 is reciprocally rotated by 90 degrees in the vertical direction by the rotating device 107 while horizontally moving by the cylinder 105 in the left and right direction of the arrow to reproduce the electrode plate 101. For this reason,
Since the flow of the jet air diffuses in the vertical direction, the stall of the jet air jet jetted from the nozzle is large, and the electrode plate 10
The dust-discharging force in the inner part in the width direction of No. 1 is reduced.
Further, as shown in FIG. 5, the air current of the jet air is moved left and right while swinging the upper part (A), the central part (B), and the lower part (C) each time, so that the electrode plate is moved when the left and right moving speed is fast. 1
A part such as a shaded area 01 where the blast air does not reach is formed, and the dust cannot be removed. Further, jet air may be blown from the nozzle toward the end surface of the electrode plate 101. In this case, powerful jet air is supplied to the electrode plate 10
You can't blow into the gap between 1.

Further, in the conventional apparatus, it is necessary to prepare an excessively large injection air amount (injection velocity / spray amount) in consideration of a decrease in the force for removing dust as described above. For this reason, there is a drawback in that it is necessary to provide a large blower equipment commensurate with it.

[0004]

Therefore, the present invention has a structure in which the jet air flow is not stalled in the gap between the electrode plates during the regeneration of the electrostatic precipitator, and a portion where the jet air does not reach is not provided. The purpose of the present invention is to provide a device that does not require a blower.

[0005]

A first aspect of the present invention is a vertical electrode in which an electrostatic precipitator is arranged so as to block a flow path of dust-containing air, and the electrostatic precipitator is arranged in parallel along the flow path. A header extending vertically to the plate is faced, and a nozzle for injecting compressed air is provided over the entire height of the electrode plate, and the header is moved in a horizontal direction orthogonal to the electrode plate. The present invention relates to a regenerating device for an electrostatic precipitator, which is characterized in that it is provided with a moving means. In particular, it is preferable that a plurality of the nozzles are provided in one direction over the length of the header, and the nozzles are arranged close to each other so that the injection ranges of the compressed air partially overlap. Alternatively, the nozzle may be provided with slit-shaped openings having a narrow width continuously or intermittently arranged in the height direction of the header.

A second aspect of the present invention is a method of regenerating an electrostatic precipitator in which dust adhering to and accumulated on an electrode plate of an electrostatic precipitator arranged so as to block a flow path of dust-containing air is removed, and the electrostatic precipitator is arranged in parallel. Concentrate the compressed air from the nozzle while moving the header that extends vertically with a nozzle that faces the electrode plate installed vertically and injects compressed air over the entire height of the electrode plate in the horizontal direction. The present invention relates to a method of regenerating an electrostatic precipitator, which is characterized in that it is sprayed as desired. In particular, it is preferable to move the header intermittently.

According to the present invention, the nozzles are provided in a row in the header extending in the same vertical direction as the electrode plates so as to be continuous, and the nozzles are exposed to the gaps between the electrode plates to blow compressed air intensively. The jet air flow jetted from the nozzle does not suddenly stall on the way. Further, the force for removing the dust in the inner part of the electrode plate does not decrease in the middle. Further, since the jet airflow linearly flows over the entire height direction and the depth of the electrode plate, there is no portion where the jet air does not reach. Therefore, it is not necessary to use an excessively large amount of jet air (jet velocity / spray amount), which takes into account the decrease from the beginning, as in the prior art, and it is only necessary to provide a blower facility corresponding to a small amount of jet air.

[0008]

According to the present invention described above, the compressed air jetted from the nozzle flows linearly over the entire surface between the electrode plates, so that there is no stall in the middle or a portion where the jetted air does not reach. . Therefore, when regenerating the electrostatic precipitator, the dust inside the electrode plate can be completely removed with a small amount of compressed air. In addition, there is an effect that the ventilation equipment for regeneration can be installed with a small air volume.

[0009]

1 is a longitudinal sectional view illustrating an embodiment of the present invention. FIG. 2 is a perspective view showing the positional relationship between the electrostatic precipitator and the injection nozzle. FIG. 3 is a perspective view of the slit nozzle.

In the first embodiment, an electrostatic precipitator 21 is arranged so as to block the flow path 11 for dust-containing air. A band-shaped filter 31 is arranged on the downstream side. The electric dust collector 2
In FIG. 1, an electrode plate A for removing dust and a discharge wire B are arranged in a tubular casing 23 having an open flow path. A front damper row 51 for opening and closing the flow path 11 is arranged on the upstream side of the electrostatic precipitator 21. Further, the rear damper row 5 for opening and closing the flow path 11 is also provided between the electrostatic precipitator 21 and the band-shaped filter 31.
2 are arranged. These damper rows 51 and 52 are also partition walls when performing a regeneration process. Further, between the electrostatic precipitator 21 and the damper row 52, the electrode plate A is arranged vertically in parallel with the flow path 11 in comparison with the electrode plate A.
A cylindrical header 53 is provided extending in the same vertical direction as the above. The cylindrical header 53 has a supply port 57 for supplying compressed air and an injection nozzle 54. A plurality of jet nozzles 54 are provided in one direction over the length of the header 53. This special injection nozzle 54
Are mounted close to each other so that the areas of compressed air partially overlap with each other, and are efficiently arranged side by side. Further, the header 5
A cylinder 56 is provided for moving 3 in the horizontal direction orthogonal to the electrode plate A. A dust reservoir 22 is provided below the electric dust collector 21. It is connected to a bag filter equipped with a suction blower (not shown) that sucks and collects dust blown off from the dust reservoir 22.

Next, a method of regenerating the electrostatic precipitator 21 for removing the dust adhering to and accumulated on the electrode plate A of the electrostatic precipitator 21 will be described. First, the front damper row 51 and the rear damper row 52 are closed to block the flow path 11 of the dust-containing air. Then, the suction blower of the bag filter is operated so that the dust-containing air generated during regeneration in the damper rows 51 and 52 is sucked into the bag filter. Therefore, the power of the electrostatic precipitator 21 is turned off so that the dust is easily removed.
Next, compressed air is supplied from the compressed air supply port 57 to the cylindrical header 5
3, and the compressed air is jetted from the jet nozzle 54. Along with this, the cylinder 56 provided in the header 53 horizontally moves the cylindrical header 53 in the arrow direction.
In this case, it is preferable that the cylindrical header 53 be intermittently moved by the cylinder 56 so as to match the gap between the electrode plates A one after another. While moving the cylindrical header 53 in the horizontal direction orthogonal to the electrode plate A, compressed air is intensively jetted from the jet nozzle 54 to scavenge the dust attached and accumulated on the electrode plate A to regenerate the electrostatic precipitator 21. Do.

When the tubular header 53 is moved one after another for a predetermined period of time to complete the regeneration of the electrostatic precipitator 21, the supply of compressed air is stopped and the jet air flow from the jet nozzle 54 is stopped.
The cylinder header 53 is returned to a predetermined position by the cylinder 56, suction of the bag filter is stopped, and the electric dust collector 21 is turned on. Then, the front damper 51 and the rear damper 5
2 is opened and dust-containing air is introduced into the flow path 11. The rest is the repetition.

The steps of the embodiment are as follows. First, in the step of starting regeneration, the front and rear dampers are closed, the suction of the vacuum filter is started, the dust collecting power is turned off, the compressed air is started to be injected from the injection nozzle, the header is moved, and the concentrated injection is performed in the gap between the electrode plates. → Move to the gap between the adjacent electrode plates ... In the process of finishing regeneration, return the header to a predetermined position → Stop the injection of compressed air from the injection nozzle → Enter the dust collection power supply → Stop the suction of the bag filter → Open the front and rear dampers.

The band-shaped filter 31 provided downstream of the electrostatic precipitator 21 is composed of a window portion and a filter cloth portion. While the electrostatic precipitator 21 has a dust collecting capability, the window portion appears in the flow path 11 and is collected. The filter cloth portion is allowed to appear in the flow path 11 from the latter half of the time when the dust capacity is lowered to the beginning of the restart of dust removal after the regeneration of the electrostatic precipitator 21. The pressure loss of the filter can be reduced by using the window when the dust collecting ability of the electric dust collection is available. Further, by using the filter of the filter cloth from the time when the dust collecting capability is lowered to the beginning of the dust removal restart, the dust that is downstream from the gap of the damper row 52 is removed during the regeneration of the electrostatic precipitator 21, and these are moved downstream. Don't let go. Further, even if dust adhering to the damper 52 is scattered at the initial stage of restarting the dust removal during regeneration, the filter cloth of the downstream band-shaped filter 31 also removes the dust and does not drop it downstream.

According to the regenerating apparatus and the regenerating method for the electrostatic precipitator 21 described above, the jet air flow jetted from the jet nozzle 54 does not stall in the gap between the electrode plates A. Therefore, even the dust on the inner side of the electrode plate A can be completely blown off with a relatively small amount of air. Also, the ventilation equipment for regeneration can be installed with a small air volume.

As another embodiment, as shown in FIG. 3, instead of the injection nozzle 54, a slit-shaped nozzle 55 having a narrow slit opening width may be provided continuously in the longitudinal direction of the cylindrical header 53. Alternatively, slit-shaped nozzles having strip-shaped openings may be provided adjacent to each other in the length direction. In this case, it is desirable to provide the slit portion continuously because the air flow is spread over the entire area.

As another embodiment, the header 5
A rack may be used as the moving means of 3.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view illustrating an embodiment of the present invention.

FIG. 2 is a perspective view showing a positional relationship between an electric dust collector and an injection nozzle.

FIG. 3 is a perspective view showing a slit nozzle.

FIG. 4 is a plan view showing a positional relationship between an electrode plate and a jet nozzle of a conventional reproducing apparatus.

FIG. 5 is a side view showing a portion of a conventional injection nozzle to which jet air does not reach.

[Explanation of symbols]

11 ... Flow path, 21 ... Electrostatic precipitator, 31 ... Strip filter, 51, 52 ... Damper row, 53 ... Header, 54 ... Injection nozzle, 55 ... Slit nozzle , 56 ... Cylinder, A ... Electrode plate.

Claims (5)

[Claims] 1. An electrostatic precipitator is arranged so as to block a flow path of dust-containing air, and extends in a vertical direction with respect to vertical electrode plates provided in parallel in the electric precipitator along the flow path. The header is faced, and a nozzle for injecting compressed air over the entire height of the electrode plate is provided on the header, and a moving means for moving the header in a horizontal direction orthogonal to the electrode plate is provided. Regeneration device for the electrostatic precipitator. 2. A plurality of the nozzles are provided in one direction over the length of the header, and the nozzles are mounted side by side so that the ranges of compressed air partially overlap with each other. Regeneration device for the described electrostatic precipitator. 3. The regeneration of the electrostatic precipitator according to claim 1, wherein the nozzle is provided with slit-shaped openings having a narrow width over the length direction of the header continuously or intermittently arranged. apparatus. 4. A method of regenerating an electrostatic precipitator in which dust adhering to and accumulating on an electrode plate of an electrostatic precipitator arranged so as to block a flow path of dust-containing air is removed, the method being parallel to a flow path. Concentrate the compressed air from the nozzle while moving the header that extends vertically with a nozzle that injects compressed air over the entire height of the electrode plate that is provided, while moving horizontally. A method of regenerating an electrostatic precipitator, characterized in that it is sprayed. 5. The method for regenerating an electrostatic precipitator according to claim 4, wherein the header is moved intermittently.