JP2018171594A - Wet electrostatic precipitator and control unit for wet electrostatic precipitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wet electrostatic precipitator and a control unit for the wet electrostatic precipitator capable of effectively washing dust at a dust collecting electrode and efficiently reducing a washing water amount.SOLUTION: In a wet electrostatic precipitator including a washing pipe 16 flowing washing water for washing dust attached to a dust collecting electrode and a plurality of spray nozzles 15 being disposed at the washing pipe 16 and jetting the washing water,: the washing pipe 16 is disposed so as to be divided into plural lines 51, 52; the plurality of spray nozzles 15 are arranged on the respective lines 51, 52; the plural lines 51, 52 of the washing pipe 16 are switched at fixed time intervals; the washing water is individually jetted from the spray nozzles 15 at every lines 51, 52 of the switched washing pipe 16.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wet electrostatic precipitator, a wet electrostatic precipitator that controls the ejection of cleaning water that cleans and removes dust adhering to a dust collecting electrode and a discharge line, and the wet electrostatic precipitator. The present invention relates to a control device.

  2. Description of the Related Art Conventionally, there is a wet type electrostatic precipitator that continuously or intermittently sprays industrial water or circulating water with respect to a dust collecting electrode or the like by a spray nozzle upward or downward (see, for example, Patent Document 1). ).

JP 2002-119889 A

  However, in the case of a wet type electrostatic precipitator that continuously cleans industrial water with a dust collector electrode or the like by spraying upward or downward with a spray, a large amount of cleaning water is required. In addition, in the case of a wet type electrostatic precipitator that cleans industrial dust with an upward or downward spray on the dust collecting electrode etc. intermittently, it is possible to reduce the amount of cleaning water. Dust adhesion occurs on the dust collection electrode and the discharge wire, causing sparking and discharge wire elongation.

  Furthermore, in the case of a wet type electrostatic precipitator that continuously circulates and circulates the circulating water upwards or downwards with respect to the dust collecting electrode, etc., if the circulating water contains residues such as dust, a high dust concentration gas In addition to the occurrence of sparks during processing and the extension of discharge lines, dust blockage of circulating water piping and spray nozzles occurs, so regular cleaning is required.

  The present invention has been made in view of such circumstances, so that dust adhering to the dust collection electrode and the discharge line can be effectively cleaned and removed, and the amount of cleaning water can be effectively reduced. The purpose is to do.

  (1) The first invention of the present invention is a cleaning pipe that circulates cleaning water for cleaning dust adhering to the dust collecting electrode, and a plurality of pipes that are provided in the cleaning pipe and eject the cleaning water. The cleaning pipe is divided into a plurality of lines, the plurality of spray nozzles are provided on each line, and the plurality of lines of the cleaning pipe are fixed. It is a wet type electrostatic precipitator that is switched at time intervals and ejects the cleaning water from the spray nozzle individually for each line of the switched cleaning pipe.

  (2) According to a second aspect of the present invention, in the first aspect, the plurality of lines of the cleaning pipe are each independently, and the washing water is ejected from the plurality of spray nozzles provided on the lines. Thus, a wet electrostatic precipitator is provided so that substantially the entire dust collecting electrode can be cleaned.

  (3) The third invention of the present invention is a wet electrostatic precipitator according to the first or second invention, wherein the plurality of lines of the cleaning pipe are switched in multiple stages.

  (4) The fourth invention of the present invention is a control device for controlling a wet electrostatic precipitator equipped with a spray nozzle that ejects cleaning water and cleans dust adhering to the dust collecting electrode, wherein the electrostatic precipitator The cleaning pipe for circulating the cleaning water is divided into a plurality of lines, and a plurality of spray nozzles are provided on each line, and the control device includes a plurality of lines for the cleaning pipe. Is a control device for a wet type electrostatic precipitator, wherein the cleaning water is ejected from the spray nozzle individually for each line of the switched cleaning pipe.

  ADVANTAGE OF THE INVENTION According to this invention, while adhering to the dust collection electrode and the discharge wire, the dust can be wash | cleaned effectively, and the amount of washing water can be reduced effectively.

It is a figure which shows the structural example of a control system. It is sectional drawing which shows schematic structure of a wet electric dust collector. It is a perspective view which shows schematic structure inside the housing of a wet electric dust collector. It is a figure which shows an example of the method of ejection of the washing water by the downward spray nozzle of the wet electric dust collector of FIG. It is a figure which shows the ejection range of the wash water by the downward spray nozzle of the wet electric dust collector of FIG. It is a figure which shows the line of the piping for washing | cleaning of the wet electric dust collector of FIG. It is a figure which shows the time chart which concerns on the washing | cleaning piping line of the wet electrostatic precipitator of FIG.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment, A various change is possible in the range which does not change the summary of this invention.

<< 1. Control system for electrostatic precipitator »
FIG. 1 is a diagram illustrating a configuration example of a wet electrostatic precipitator system according to an embodiment of the present invention. As shown in FIG. 1, the wet electrostatic precipitator system 10 includes a wet electrostatic precipitator 1 and a control device 2. The wet electrostatic precipitator system 10 is a concept that includes a wet electrostatic precipitator including the controller 2 as a component, that is, a wet electrostatic precipitator including the controller 2 in the wet electrostatic precipitator. 1 and the control device 2 are not limited to those having different configurations.

  Hereinafter, each structure of the wet electrostatic precipitator 1 and the control apparatus 2 is demonstrated separately.

[Wet electric dust collector]
FIG. 2 is a diagram illustrating a schematic configuration of the wet electrostatic precipitator 1. 2A and 2B are views of the external appearance of the wet electrostatic precipitator 1 as seen from different directions substantially perpendicular to each other.

  The wet electrostatic precipitator 1 includes an upper casing 11, a dust collecting electrode 12, which also functions as a side casing, a lower casing 13, a frame 14, a downward spray nozzle 15, and a cleaning pipe 16. ing.

  In the wet electric dust collector 1, the upper casing 11, the dust collecting electrode 12, and the lower casing 13 are combined in that order from above to form a casing. The casing of the wet electrostatic precipitator 1 is fixed by a frame 14 so as to be spaced apart from the ground by a predetermined distance. The material of the housing is not particularly limited, but may be conductive FRP (Fiber Reinforced Plastics).

  Here, the wet electrostatic precipitator 1 is provided with a downward spray nozzle 15 inside the housing. The downward spray nozzle 15 ejects the cleaning water flowing through the cleaning pipe 16 as a fine mist in a substantially vertical downward direction. Thereby, fine particles such as mist and dust adhering to the dust collection electrode 12 are washed and removed.

  In the wet electrostatic precipitator 1, cleaning pipes 16 through which cleaning water flows are provided in a plurality of systems (lines). For example, the cleaning pipe 16 is divided into two systems of an A line and a B line. Washing water flows through each line of the cleaning pipe 16 independently of each other, and the washing water is sprayed from a downward spray nozzle 15 provided on each line.

  As will be described in detail later, in the wet electrostatic precipitator 1, a plurality of lines of the above-described cleaning pipe 16 are controlled so as to be switched to each other by the control device 2. Thus, the amount of cleaning water is effectively reduced while maintaining the cleaning action against dust and the like by spraying cleaning water uniformly on the dust collecting electrode 12.

  Next, FIG. 3 shows a schematic configuration inside the housing of the wet electrostatic precipitator 1. As shown in FIG. 3, inside the housing of the wet electrostatic precipitator 1, an upper grid 21, the above-described dust collecting electrode 12, a lower grid 23, an electrode rod 24, a discharge wire 25, a weight 26, An upward spray nozzle 27 and a cleaning pipe 28 are provided.

  The upper grid 21, the dust collecting electrode 12, and the lower grid 23 are arranged so as to be spaced apart from each other by a predetermined distance in that order from above and to be substantially parallel to each other in the horizontal direction.

  The dust collection electrode 12 is configured by repeatedly arranging a plurality of “chambers” with a rectangular tube as a unit (hereinafter, such units are referred to as “chambers”). Specifically, when one direction is called “vertical direction” and the direction perpendicular to the vertical direction is called “horizontal direction” in the substantially horizontal direction, N units are repeatedly arranged continuously in the vertical direction. The dust collection electrode 12 is configured by repeatedly arranging M units in the horizontal direction in succession (hereinafter referred to as “N × M”). Note that “N” and “M” are independent integer values, and in the example shown in FIG. 3, the number of “chambers” in the dust collection electrode 12 is N × M = 9 × 9. Yes.

  Although the chamber which comprises the dust collection electrode 12 is not specifically limited, For example, it is a square tube which consists of a side with a length of 35 cm-50 cm. Moreover, the dust collection electrode 12 can be comprised by electroconductive FRP, for example.

  The discharge electrode in the dust collecting electrode 12 is composed of an electrode rod 24 and a discharge wire 25. As shown in FIG. 3, the electrode rod 24 is disposed so as to penetrate the center inside a predetermined “chamber” of the dust collecting electrode 12 in a substantially vertical direction, and has an upper end fixed to the upper grid 21 and a lower end. Is fixed to the lower grid 23. Further, as shown in FIG. 3, the discharge line 25 is suspended from the upper grid 21 and is disposed so as to penetrate the center inside of a predetermined “chamber” of the dust collecting electrode 12 in a substantially vertical direction. The discharge line 25 is connected to a weight 26 provided on the upper portion of the lower grid 23 from the viewpoint of having a tension that does not loosen.

  In the discharge electrode, a negative DC high voltage (charge voltage) supplied from the power supply device is directly applied to the electrode rod 24. On the other hand, a negative DC high voltage applied to the electrode rod 24 is applied to the discharge line 25 via the upper grid 21.

  The upward spray nozzle 27 is disposed above the four corners of each “chamber” of the dust collecting electrode 12 and ejects cleaning water flowing through the cleaning pipe 28 as a fine mist in a substantially vertical upward direction. Thereby, together with the downward spray nozzle 15 described above, fine particles such as mist and dust adhering to the dust collecting electrode 12 are washed and removed. In the wet electrostatic precipitator 1, since the cleaning water is ejected from the upward spray nozzle 27 as a fine mist in a substantially vertical upward direction, the dispersion of the cleaning water is improved. The amount of water used can be reduced. The upward spray nozzle 27 is a component that contributes to an increase in negative DC high voltage applied to the electrode rod 24 and the discharge line 25.

[Control device]
The control device 2 is electrically connected to the wet electrostatic precipitator 1, and in particular, executes control to switch the line of the cleaning pipe 16 through which the cleaning water ejected from the downward spray nozzle 15 described above flows. In addition, as above-mentioned, this control apparatus 2 may be integrated in the wet electrostatic precipitator as the wet electrostatic precipitator system 10.

  Specifically, as will be described later, when the cleaning pipe 16 is divided in advance into two or more lines, for example, the control device 2 is different from a predetermined one line to another one of the two or more lines. Execute control to switch to line.

  By such a control, when viewed at a specific point in time, among the two or more lines of the cleaning pipe 16, a line that is being cleaned and a line that is not being cleaned exist simultaneously. However, by controlling to switch between the line that is being cleaned and the line that is not being cleaned, all the “chambers” of the dust collecting electrode 12 can be continuously cleaned when viewed in total over time. . As a result, it is possible to effectively prevent dust from adhering to the dust collecting electrode 12 and the discharge wire 25 and to effectively reduce the amount of cleaning water compared to the conventional case. Specifically, the amount of washing water can be reduced at a rate of 50% or more.

≪2. Control by control system >>
Next, control of the ejection of cleaning water by the downward spray nozzle 15 in the wet electrostatic precipitator 1 will be described.

  FIG. 4 is a diagram for explaining an example of a method of jetting cleaning water by the downward spray nozzle 15 of the wet electrostatic precipitator 1. As shown in FIG. 4, the downward spray nozzle 15 of the wet electrostatic precipitator 1 causes the cleaning water flowing through the cleaning pipe 16 to be ejected in a fine mist shape in a substantially vertical downward direction. At this time, the cleaning water is sprayed within a predetermined angle range with respect to the cleaning pipe 16. In addition, in the example of FIG. 4, a mode that it sprays within the range of 105 degrees as a predetermined angle is shown.

  FIG. 5 is a view showing a range of washing water ejected by the downward spray nozzle 15 of the wet electrostatic precipitator 1. When cleaning water is ejected to the dust collecting electrode 12 by the downward spray nozzle 15, each “chamber” of the dust collecting electrode 12 has a circular shape centering on the downward spray nozzle 15 when viewed from above as shown in FIG. 5. The washing water is ejected as fine mist. In addition, the circle drawn centering on the code | symbol "15" in FIG. 5 shows the spray range of the wash water sprayed virtually.

  Each of the plurality of lines of the cleaning pipe 16 is arranged so that substantially the entire dust collecting electrode 12 can be cleaned by the ejection of cleaning water from a downward spray nozzle 15 provided on the line. Yes. Specifically, each line is configured such that a plurality of pipes are branched, and a downward spray nozzle 15 is provided on the plurality of branched pipes (see, for example, FIG. 6 described later). By doing so, as shown in FIG. 5, the downward spray nozzle 15 is configured to be disposed on each line at a predetermined distance, and all the dust collecting electrodes 12 are arranged. The washing water is uniformly ejected into the “chamber”. For example, the downward spray nozzle 15 is repeatedly arranged with L units in the vertical direction of the dust collecting electrode 12 and is continuously arranged with P units in the horizontal direction (hereinafter referred to as “L”). XP)). “L” and “P” are independent arbitrary integer values. In the example of FIG. 5, the number of downward spray nozzles 15 is L × P = 3 × 4.

  FIG. 6 shows a line of the cleaning pipe 16 in the wet electrostatic precipitator 1. 6A is a diagram when the configuration of the line is viewed from the top surface, and FIGS. 6B1 and 6B2 are diagrams when the configuration of the line is viewed from the side surface. As shown in FIG. 6, the cleaning pipe 16 of the wet electrostatic precipitator 1 has two lines, an A line 51 and a B line 52, and the two lines are provided by an automatic three-way valve 41. Can be switched. Specifically, the line switching by the automatic three-way valve 41 is executed by being controlled by the control device 2.

  For example, in the line of the cleaning pipe 16 of the wet electrostatic precipitator 1, when the automatic three-way valve 41 switches to the A line 51, the downward spray disposed on the A line 51 as shown in FIG. 6 (B1). Each of the nozzles 15 ejects the washing water as a fine mist in a substantially vertical downward direction. Further, when the automatic three-way valve 41 switches to the B line 52, as shown in FIG. 6 (B2), each of the downward spray nozzles 15 arranged on the B line 52 makes the washing water fine in a substantially vertical downward direction. Erupt as mist.

  Such control of the line of the cleaning pipe 16 is executed by the control device 2, and the control device 2 switches between two or more lines every predetermined time.

  Here, FIG. 7 shows a cleaning time chart. FIG. 7A shows a time chart when intermittent cleaning is performed by a conventional method. “Intermittent cleaning” means that cleaning of the dust collecting electrode by ejection of cleaning water is repeated operation and stop after a certain period of time. For example, as shown in FIG. Washing is repeated while repeating operation and stop. As can be seen from this time chart, it is possible to reduce the amount of washing water by intermittently ejecting washing water and washing. However, there is a possibility that the dust adhering to the dust collecting electrode 12 and the discharge wire 25 in the dust collecting electrode 12 may not be sufficiently cleaned. In particular, when the gas having a high dust concentration is treated, the dust adhering is efficiently removed. It may not be possible. If the dust is not sufficiently removed, troubles such as occurrence of sparks, discharge line elongation, deflection, and disconnection may occur.

  On the other hand, continuous cleaning, which is not intermittent cleaning, and is always performed by jetting cleaning water, can be efficiently cleaned and removed even when high-concentration dust is processed, but the amount of cleaning water is Become more. “Continuous cleaning” means that cleaning of the dust collecting electrode by ejection of cleaning water is performed without interruption in time.

  On the other hand, in FIG. 7B, the cleaning pipe 16 for flowing the cleaning water is divided into a plurality of lines (two lines of the A line 51 and the B line 52). 5 is a diagram showing a time chart when a plurality of downward spray nozzles 15 are provided on 52 and continuous cleaning is performed as a whole by switching control of each line in multiple stages. FIG. That is, in each of the lines 51 and 52, operation and stop are repeated at intervals of 15 minutes. For example, when the A line 51 is operating, the B line 52 is stopped and the B line 52 is stopped. At this time, the B line 52 is in operation, and the A line 51 and the B line 52 are alternately operated without interruption in time so that the entire line is continuously washed. The washing water can be switched by the lines 51 and 52 via the automatic three-way valve 41.

  Further, as described above, each of the plurality of lines (lines 51 and 52) of the cleaning pipe 16 is independent of the dust collecting electrode 12 by jetting the cleaning water from the downward spray nozzle 15 provided on the line. Since the entire line is disposed so that it can be cleaned, it is disposed in all the chambers of the dust collecting electrode 12 and the dust collecting electrode 12 during the operation of each of the A line 51 and the B line 52. The discharged discharge line 25 can be cleaned accurately.

  Accordingly, the amount of cleaning water can be reduced by approximately 50% or more compared to the amount of cleaning water used during conventional continuous cleaning, and the dust on the dust collection electrode 12 and the discharge wire 25 is effectively cleaned. be able to. And various troubles based on dust adhesion etc. can be eliminated.

  As mentioned above, although one Embodiment about the control apparatus for wet electric dust collectors and wet electric dust collectors concerning this invention was described, this invention is not limited to this embodiment mentioned above. Further, the effects described in the present embodiment are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the present embodiment.

  For example, in the above-described embodiment, the aspect in which the A line 51 and the B line 52 are used as the lines of the cleaning pipe 16 of the wet electrostatic precipitator 1 is not particularly limited thereto. A plurality of cleaning piping lines may be used.

  Moreover, in embodiment mentioned above, although the aspect in which washing | cleaning is repeated alternately by the A line 51 and the B line 52 alternately is shown, it does not restrict | limit to this in particular, For example, A line 51 and The B line 52 may be temporarily operated at the same time, for example, immediately before switching, and even in such a case, the amount of washing water can be effectively reduced. And since it has the timing which operate | moves simultaneously simultaneously, it can prevent that it becomes the state where the washing | cleaning operation is not performed as the whole wet electrostatic precipitator without operating any line.

  Further, as shown in FIG. 7B, the mode in which the A line 51 and the B line 52 are switched in multiple stages has been shown. However, for example, the switching between the A line 51 and the B line 52 may be performed in one stage. Good. However, it is preferable to switch the lines in multiple stages, so that dust attached to the dust collection electrode 12 and the discharge line 25 can be more effectively cleaned with the same amount of cleaning water.

  In summary, the wet electrostatic precipitator to which the present invention is applied only needs to have the following configuration, and can take various embodiments. That is, a wet electrostatic precipitator (for example, the wet electrostatic precipitator 1 of FIG. 1) to which the present invention is applied includes a cleaning pipe for flowing cleaning water for cleaning dust adhering to the dust collecting electrode, and a cleaning Provided with a plurality of spray nozzles that are provided in the pipe for cleaning and eject the cleaning water, and the pipe for cleaning is divided into a plurality of lines (for example, the A line 51 and the B line 52 in FIG. 6). A plurality of spray nozzles are provided on each line, and a plurality of lines of the cleaning pipe are switched at regular time intervals, and cleaning water is ejected from the spray nozzle individually for each line of the switched cleaning pipe. If it is controlled in this way, it is sufficient. As a result, even if there is a line of cleaning piping that stops cleaning, all the “chambers” of the dust collecting electrode can be cleaned effectively, and dust adheres to the dust collecting electrode and the discharge line. Can be prevented. Moreover, the amount of cleaning water can be reduced by 50% or more compared to conventional continuous cleaning.

DESCRIPTION OF SYMBOLS 1 Wet electrostatic precipitator 2 Control apparatus 10 Wet electrostatic precipitator system 11 Upper casing 12 Dust collection electrode 13 Lower casing 14 Frame 15 Downward spray nozzle 16 Cleaning pipe 21 Upper grid 23 Lower grid 24 Electrode rod 25 Discharge line 26 Weight 27 Upward spray nozzle 28 Cleaning pipe 41 Automatic three-way valve 51 A line 52 B line

Claims (4)

A cleaning pipe that distributes cleaning water for cleaning dust adhering to the dust collecting electrode;
A plurality of spray nozzles provided in the cleaning pipe and for spraying the cleaning water;
The cleaning pipe is provided by being divided into a plurality of lines, and the plurality of spray nozzles are provided on each line,
A wet type electrostatic precipitator that switches a plurality of lines of the cleaning pipe at regular time intervals and jets the cleaning water individually from the spray nozzle for each switched line of the cleaning pipe. The plurality of lines of the cleaning pipe are each arranged so that substantially the entire dust collecting electrode can be cleaned by spraying cleaning water from the plurality of spray nozzles provided on the lines. The wet electrostatic precipitator according to claim 1. The wet electrostatic precipitator according to claim 1 or 2, wherein the plurality of lines of the cleaning pipe are switched in multiple stages. A control device for controlling a wet electrostatic precipitator equipped with a spray nozzle for jetting cleaning water and cleaning dust adhering to the dust collecting electrode,
The electrostatic precipitator is provided with a cleaning pipe that circulates the cleaning water divided into a plurality of lines, and a plurality of spray nozzles are provided on each line,
The control device switches a plurality of lines of the cleaning pipe at regular time intervals, and individually controls the cleaning pipe for each of the switched cleaning pipes to discharge the cleaning water from the spray nozzle. apparatus.

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