JP2011143379A - Electric dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the constitution of a washing apparatus by decreasing the number of nozzles of a washing means to be used for an electric dust collector provided with an automatic washing function. <P>SOLUTION: The electric duct collector includes a housing having a dust collecting unit 2 and dampers 4 with adjustable openings to be provided at an inlet and an outlet. A washing nozzle 3 is provided at the tip of the damper 4 as a washing means for washing the dust collecting unit 2. A rotary shaft of the damper 4 is composed of a piping 5 for transporting washing water and a rotary shaft of a damper motor 6. Upon washing, the damper 4 of either the inlet or the outlet is closed. Washing is performed by injecting a washing liquid from a washing nozzle 3 provided at the tip of the other damper 4 while swinging the opened damper 4 by the damper motor 6. With the constitution, a wide washing range is provided for the individual nozzles, making it possible to efficiently wash with fewer number of nozzles. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to cleaning of an electrostatic precipitator that collects dust and the like, which are airborne particles.

  An electrostatic precipitator is a device that applies a high DC voltage to the dust collector electrode and discharge electrode that are placed in opposition to each other to cause corona discharge, and charges the dust contained in the exhaust gas flowing in from the device suction port. It collects in the dust collection pole. However, when performing continuous operation, especially when the dust collected on the dust collector is a mixture of oily mist and dust, the dust repeatedly accumulates on the electrode plate, leading to a decrease in applied current. The dust collection capacity will be significantly reduced. Therefore, it is necessary to periodically clean the dust accumulated on the electrode plate. The structure of the cleaning mechanism in the electric dust collector is various. For example, as in the electric dust collector 101 shown in FIG. 6, the pipe 102 in the cleaning means serves as the rotating shaft of the damper means 103, and the damper means and the pipe are integrated. In some cases, the dust collection unit is cleaned by the cleaning nozzle 105 in the cleaning means arranged so as to be directed to the dust collection unit 104 when the damper means is closed.

JP 2004-141831 A

  In such an electrostatic precipitator cleaning mechanism, the cleaning range of individual cleaning nozzles is limited, so a large number of cleaning nozzles are required, and accordingly, the path of cleaning piping and the like is complicated, a large amount of cleaning water, and There were problems such as complicated maintenance.

  Accordingly, the present invention solves the above-described conventional problems, and by adopting a mechanism capable of swinging the piping and the cleaning nozzle in the cleaning means, the cleaning mechanism can be simplified, the amount of cleaning water used can be reduced, and maintainability can be improved. It is an object of the present invention to provide an improved electric dust collector cleaning mechanism.

  In order to achieve this object, the present invention provides a dust collection unit composed of a discharge electrode plate for applying a predetermined voltage and a grounded ground electrode plate, and a cleaning means for cleaning the dust collection unit. And a damper means for controlling the inflow of the dust collection air to the dust collection unit, the washing means being provided with a washing nozzle as the washing means, and at the time of washing, the damper is swung using a damper motor. It is a feature that achieves the intended purpose.

  According to the present invention, a dust collection unit composed of a discharge electrode plate for applying a predetermined voltage and a grounded ground electrode plate, cleaning means for cleaning the dust collection unit, and the dust collection unit A damper means for controlling the inflow of dust collection air, and as the cleaning means, a cleaning nozzle is provided in the damper means, and at the time of cleaning, the damper is swung using a damper motor. This makes it possible to expand the cleaning range of individual nozzles without adding an additional drive system, enabling efficient cleaning with fewer nozzles, and reducing the amount of cleaning water required and improving maintainability. There is an effect of being connected.

Sectional drawing which shows the structure outline | summary of the damper and washing | cleaning apparatus of Embodiment 1 of this invention Another sectional view showing the composition outline of the damper and washing device of Embodiment 1 of the present invention State diagram of windward damper during blowing in Embodiment 2 of the present invention State diagram of upwind damper during cleaning in Embodiment 2 of the present invention Configuration schematic diagram of Embodiment 3 of the present invention Schematic diagram of conventional cleaning equipment (broken line is for cleaning)

  The electrostatic precipitator according to claim 1 of the present invention is a dust collection unit composed of a discharge electrode plate for applying a predetermined voltage and a grounded ground electrode plate, and a cleaning means for cleaning the dust collection unit. And a damper means for controlling the inflow of the dust collection air to the dust collection unit, the washing means being provided with a washing nozzle as the washing means, and at the time of washing, the damper is swung using a damper motor. It is a feature. This makes it possible to expand the cleaning range of individual nozzles without adding a new drive system, enabling efficient cleaning with fewer nozzles, and reducing the amount of cleaning water required. There is an effect of improving the maintainability.

  The cleaning nozzle is installed on the leading edge chord of the blade of the damper so that the injection direction is parallel to the chord. As a result, there are no protrusions on the damper blade surface that hinders rectification, and the rectification effect is improved during ventilation, especially at high wind speeds or when controlling the air volume with an angle of attack. It has the effect of leading to a reduction in

  Further, the cleaning nozzle may be configured such that the nozzle tip is positioned so as to coincide with the front edge of the damper blade. This eliminates protrusions that hinder rectification at the leading edge, improving the rectification effect during ventilation, particularly at high wind speeds, or when controlling the air volume with an angle of attack, reducing the pressure loss inside the machine, and consequently reducing the power consumption of the blower. There is an effect that leads to reduction.

  Further, the blade rows of the dampers are opposed blades, and the blade rows are arranged so that the front and rear of the blades are alternately turned up and down in the closed state. As a result, in the windward damper means, it is possible to open and close the damper blade leading edge side in the leeward (unit) direction at the time of cleaning and in the windward direction at the time of air blowing. This eliminates the need for this, and has the effect of reducing production costs and improving maintainability.

  The washing nozzle is installed only in the blade row in which the front edge side of the damper blade faces downward in the closed state. As a result, the nozzle hole of the cleaning nozzle provided in the cleaning means can also serve as a drain hole when not cleaning, so that the residual water in the cleaned pipe can be drained naturally. There is an effect that the drying time of the pipe and the dust collecting unit is shortened.

  The damper performs a cleaning operation so that the leeward damper is closed during the leeward operation and the leeward damper is closed during the leeward operation. As a result, the leeward damper is closed during the windward cleaning operation, and the windward damper is closed during the leeward cleaning operation, thereby avoiding splashing of cleaning water to both the windward and leeward outside of the machine. There is an effect that can be done.

  In addition, a pipe for passing the cleaning liquid to the upper part of the dust collecting unit and a cleaning nozzle attached to the pipe are provided, and the pipe is swung by a damper motor in the damper means. As a result, a prefilter such as a demister filter is installed before and after the dust collection unit, and even if it is difficult to clean the dust collection unit with the cleaning means provided at the damper position, the upper part of the dust collection unit is separated from the filter cleaning pipe. By using the driving force of the damper motor to swing the piping, the cleaning means provided in the above can be expanded to the cleaning range of individual nozzles without adding a new driving system. There is an effect that efficient cleaning is possible with a small number of nozzles.

  Further, the cleaning nozzle is a flat spray type, and the spray surface is installed so as to be parallel to the swing axis. As a result, the cleaning range of each nozzle can be widened in the damper blade span direction. In addition, by taking the swing angle as large as possible, it is possible to provide a highly efficient cleaning device with fewer nozzles. Play.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The electric dust collector of the 1st Embodiment of this invention is demonstrated using FIG.

  Although the electric dust collector of this Embodiment is not shown in figure, the two surfaces which a box-shaped housing | casing oppose are made into the inflow port and the outflow port of air. Inside the housing, a dust collection unit 2 and a damper 4 with a variable opening provided at the inlet and outlet are provided. A cleaning nozzle 3 is provided at the tip of the damper 4 as a cleaning means for cleaning the dust collection unit 2. The rotating shaft of the damper 4 is constituted by the cleaning water carrying pipe 5 and the rotating shaft of the damper motor 6. The cleaning nozzle 3 is installed on the leading edge portion chord of the damper blade 4a so that the injection direction is parallel to the chord, and the cleaning water is circulated by a pump to the cleaning water transport pipe 5 for cleaning water transport. It is conveyed to each washing nozzle 3 by a branch pipe 7 branched from the pipe 5. As shown in FIG. 2, the cleaning nozzle 3 may be configured to be installed at the front edge of the damper blade 4a so that the tip of the nozzle coincides with the front edge of the damper blade 4a. However, it is desirable that the mounting structure of the cleaning nozzle 3 in this case is configured so as to be detachable instead of a structure embedded in the damper blade 4a in consideration of maintainability of the cleaning nozzle 3.

  Next, the operation of this electric dust collector will be described. During normal operation, that is, when dust collection is performed, an external blower (not shown) is operated to feed dust-containing air into the electric dust collector, and a high voltage is applied to the dust collection unit 2. And dust will be removed. The removed dust or the like adheres to a dust collection electrode plate (not shown) of the dust collection unit 2, but if it accumulates, the removal rate is reduced, so that the attached dust or the like needs to be washed away. When washing off the adhering dust, first, the electric dust collector (dust collection unit 2) is stopped. Next, either the inflow port or the outflow port is closed. Further, while the other opened damper 4 is swung by the damper motor 6, the cleaning liquid is sprayed from the cleaning nozzle 3 provided at the tip thereof.

  According to the above configuration, the damper blade 4a provided with the cleaning nozzle 3 is configured to swing using the damper motor 6, so that the cleaning range of each nozzle can be extended without adding a new drive system. Therefore, efficient cleaning is possible with fewer nozzles. Furthermore, there is an effect that it leads to reduction of a necessary amount of cleaning water and improvement of maintainability. In addition, since there is no protrusion that hinders rectification on the blade surface of the damper blade 4a or on the leading edge of the wing, the rectification effect is improved at the time of air blowing, particularly at high wind speeds or when controlling the air volume with an angle of attack, There is an effect that the pressure loss in the machine is reduced, and consequently the power consumption of the blower is reduced.

  Further, the swing width of the cleaning nozzle 3 can be arbitrarily changed, but the cleaning range calculated from the spray shape, the injection pressure, the injection flow rate, the distance to the object to be cleaned, etc. of each cleaning nozzle 3 is taken into consideration. Then, the nozzle arrangement is determined to be a highly efficient nozzle arrangement. For example, by making the spray shape a flat spray type, each nozzle can be sprayed in a wide range in the lateral direction (damper blade 4a span direction), and the swing width can be made as large as possible, with fewer nozzles. A wider range can be cleaned. However, in the case of jetting upward from the horizontal, the jet water is caught in the falling wash water, so that the jet energy from the nozzle is offset by the drop energy and is inefficient. Swing within the range is desirable.

(Embodiment 2)
3 and 4, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  3 and 4 show an electric dust collector according to a second embodiment of the present invention, FIG. 3 is a state diagram of the windward damper 4 during blowing, and FIG. 4 is a state of the windward damper during cleaning. The figure is shown. As shown in FIGS. 3 and 4, the damper blade 4 a is composed of opposed blades, and the blade row is arranged from above so that the front and back of the blades are alternately turned up and down in the closed state. That is, in the closed state, the leading edges and the trailing edges of the damper blades 4a overlap each other. As shown in FIG. 3, the damper 4 is opened so that the front edge of each damper blade 4 a (cleaning nozzle 3) is directed to the windward direction when blowing. Further, at the time of cleaning, as shown in FIG. 4, it opens so as to face the leeward (unit) direction.

  According to the above configuration, the windward damper 4 can open the front edge side of the damper blade 4a in the leeward (unit) direction at the time of cleaning and the windward direction at the time of blowing, so that the damper structure on the windward and leeward side can be opened. Since this distinction is unnecessary, there is an effect that the manufacturing cost can be reduced or maintenance can be improved.

  In addition, the cleaning nozzle in the cleaning unit may be configured to be installed only on a blade (for example, the middle blade in FIG. 3) whose front edge side of the damper blade 4a faces downward when in the closed state. However, in order to prevent the wash water that is drained naturally in the closed state from leaking out of the machine, the damper blade 4a with the leading edge facing downward in the closed state has an overlapping portion 8 with the damper blade 4a facing upward. It is desirable to install it inside.

  According to the said structure, the nozzle hole of the washing nozzle with which the said washing | cleaning means was equipped becomes a drain hole at the time of non-washing. Therefore, it becomes possible to drain the residual water in the pipe after washing naturally, leading to the effect of shortening the drying time of the pipe and the dust collection unit. The leeward damper can also be opened and closed on the leeward side and the leeward side of the structure, but for the purpose of operation of the equipment, it is controlled to open and close in the unit direction during blowing and cleaning.

  Further, the opening / closing timing of the damper 4 during cleaning is controlled so that the leeward side is closed during the windward operation, and the windward side is closed during the leeward operation. There is an effect that it is possible to avoid splashing the washing water to the outside of the leeward machine.

(Embodiment 3)
As shown in FIG. 5, the electric dust collector according to the third embodiment of the present invention includes a dust collection unit 2, an upper pipe 9 provided on the top of the dust collection unit 2, and a dust collection unit 2. The pre-filter 10 installed on the windward side and the leeward side, the damper motor 6, and the wire 11 that transmits the power of the damper motor 6 to the upper pipe 9. The upper pipe 9 is installed so that the pipe bearing portion rotates smoothly, and is connected by a damper motor 6 and a wire 11 that transmits the power.

  Generally, an electric dust collector is provided with a prefilter 10 on the windward side of the dust collection unit 2 so that relatively large dust does not enter the dust collection unit 2. In this case, in the cleaning in which the cleaning liquid is sprayed from the position of the damper 4, the cleaning liquid does not reach the dust collection unit 2, and the cleaning is difficult. The dust collection unit 2 is often configured to perform cleaning by a cleaning means provided at the top. For this reason, according to the above configuration, even in the electric dust collector in which the pre-filter is provided on the windward side of the dust collecting unit 2, a new drive system is separately provided by swinging the upper pipe 9 using the damper motor 6. Without adding, it is possible to extend the cleaning range of each nozzle, so that it is possible to perform efficient cleaning with fewer nozzles.

  Since the cleaning mechanism of the electrostatic precipitator according to the present invention enables highly efficient cleaning with fewer nozzles in the cleaning means, it is effective for a small electrostatic precipitator that requires space saving. is there.

2 Dust collection unit 3 Cleaning nozzle 4 Damper 5 Pipe for cleaning water conveyance 6 Damper motor 7 Branch pipe 8 Duplicated part (blade row) 9 Upper pipe 10 Prefilter 11 Wire

Claims (8)

A dust collection unit composed of a discharge electrode plate for applying a predetermined voltage and a grounded ground electrode plate; a cleaning means for cleaning the dust collection unit; and an inflow of dust collection air to the dust collection unit. An electrostatic precipitator comprising a damper means for controlling, wherein the washing means is provided with a washing nozzle in the damper means, and at the time of washing, the damper means is swung using a damper motor. . 2. The electrostatic precipitator according to claim 1, wherein the cleaning nozzle is installed on a leading edge portion chord of a blade of the damper so that an injection direction is parallel to the chord. 3. The electrostatic precipitator according to claim 2, wherein the cleaning nozzle is installed such that a tip of the nozzle coincides with a leading edge of the damper blade. 4. The damper according to claim 1, wherein the blade rows of the dampers are opposed blades, and the blade rows are arranged so that the front and back of the blades are alternately turned up and down when closed. Electric dust collector. 5. The electrostatic precipitator according to claim 1, wherein the cleaning nozzle is installed only in a blade row in which a damper blade leading edge side faces downward in a closed state. The said damper performs washing | cleaning operation | movement so that a leeward damper may be closed at the time of leeward operation, and a leeward damper may be closed at the time of leeward operation. Electric dust collector. The pipe according to claim 1, further comprising a pipe through which cleaning liquid is passed above the dust collection unit and a washing nozzle attached to the pipe, wherein the pipe is swung by a damper motor in the damper means. Jin machine. 8. The electrostatic precipitator according to claim 1, wherein the cleaning nozzle is of a flat spray type, and the spray surface is installed so as to be parallel to the swing axis.

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