JPH11580A - Electric precipitator and method of washing electric precipitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent insulator parts from being wetted with water when washing is performed and after the washing is finished, to enable immediately restarting without making drying treatment. SOLUTION: In an electric precipitator wherein DC high voltage outputted from a DC high voltage power source 21 is applied to electrode units 2 through feed insulators 16, air blast nozzles 17, 18 are installed around support insulators 13 for supporting electrodes and the feed insulators 16. On stationary operation, pressurized air is blasted to the outer periphery of the support insulators 13 and the feed insulators 16 to air seal the insulators 13, 16 to prevent dust in air to be treated from sticking to the insulators 13, 16. And on washing, pressurized air stronger than on the stationary operation is blasted to the outer periphery of the support insulators 13 and the feed insulators 16 to air seal the insulators 13, 16 to prevent droplets from sticking to the insulators.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electric precipitator installed in a high humidity atmosphere and a method for cleaning the electric precipitator.

[0002]

2. Description of the Related Art In recent years, for example, a method using an electric dust collector has been used as a method for purifying contaminated air in a tunnel on an automobile road. In this method using an electric dust collector, a detour tunnel is formed in a tunnel, an electric dust collector is installed, contaminated air extracted from the tunnel into the tunnel is purified by the electric dust collector, and then sent to the tunnel again. It is intended to purify the contaminated air in the tunnel by taking care.

[0003] By installing an electric precipitator in a detour tunnel in a tunnel as described above, it is possible to purify contaminated air in the tunnel. However, in the electric dust collecting device, dust is accumulated in the dust collecting passage by the dust collecting process,
Since dust adheres to the electrode part, it is necessary to clean it, for example, about once a day.

If the dust collected by the electric dust collector has little tackiness, it can be cleaned by blowing pressurized air to the dust passage. However, in places with high humidity such as in tunnels, dust adheres firmly to the surfaces of the electrodes and insulators due to the moisture. Can not do it. Also,
If a car is equipped with a spike tire, the spike tire will cut the road surface and generate concrete dust.However, the concrete dust becomes sticky by combining with the snow melting agent, and pressurized air is released. Sufficient cleaning is difficult only by spraying.

In order to remove sticky dust as described above, a water washing method is used in which pressurized water is sprayed instead of air to remove the dust. Although the above-mentioned water cleaning method can provide a large cleaning power, it is necessary to dry the inside of the electrostatic precipitator before resuming operation because the insulator portion is wetted by water and insulation is deteriorated.

For this reason, conventionally, after washing with water,
Pressurized air is blown onto the insulator to blow off water drops adhering to the insulator, and thereafter, the insulator is dried by passing air through the dust collecting unit for a certain period of time.

[0007]

However, in the method described above, the pressurized air is blown onto the insulator portion wet by the water washing and then dried by ventilation to recover the insulation of the insulator portion. It takes time, after washing with water,
There is a problem that the electric dust collector cannot be restarted immediately.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can surely prevent the insulator portion from being wet with water when water washing is performed. It is an object of the present invention to provide an electric precipitator that can be restarted immediately and a method of cleaning the electric precipitator.

[0009]

The invention according to claim 1 is
In an electrostatic precipitator for applying a high voltage to an electrode of the electric precipitator via a power supply insulator, an air blowing nozzle for air-sealing the outer periphery thereof is provided around the support insulator supporting the electrode or the power supply insulator. It is characterized by having done.

According to a second aspect of the present invention, in the above-mentioned electric precipitator, pressurized air is blown around an outer periphery of a supporting insulator or a power supply insulator for supporting the electrode, and the support insulator or the power supply insulator is air-sealed. It is characterized by preventing dust from adhering to the surface.

According to a third aspect of the present invention, at the time of washing the electric precipitator with water, pressurized air is blown around the outer periphery of the support insulator or the power supply insulator for supporting the electrodes, and the support insulator or the power supply insulator is air-sealed. The feature is to prevent water droplets from adhering to the insulator.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall schematic configuration diagram of an electric precipitator according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a dust collecting unit, which is installed, for example, in a detour tunnel formed in a tunnel of an automobile road. The dust collecting unit 1 is provided with an electrode unit 2, an inlet damper 3a for controlling the flow of contaminated air into the dust collecting passage, an outlet damper 3b, a dust collecting passage, a water washing nozzle 4 for washing the electrode plate, and the like. Has become.

The electrode unit 2 includes a plurality of electrode support plates 11, and each electrode support plate 11 supports a plurality of, for example, four electrode support bars 12. These electrode support rods 1
2 is provided with a plurality of electrode plates. Each of the electrode support plates 11 is held by, for example, two support insulators 13. These support insulators 13 are supported by electrode unit casings 15 via support arms 14 as shown in FIGS. 2 and 3.
Attached to. As shown in FIG. 1, a high DC voltage is supplied to the electrode support rod 12 from a DC high voltage power supply 21 via a power supply insulator (penetrating insulator) 16. The power supply insulator 16 is penetrated and attached to a side wall of a casing (not shown).

An air nozzle 1 for generating seal air is provided near the support insulator 13 and the power supply insulator 16.
7, 18 are provided. FIG. 2 is a front view showing details of a portion A in FIG. 1, that is, a support insulator 13, and FIG. 3 is a side view of the same. As shown in FIGS. 2 and 3, an air nozzle 17a for blowing air is provided above the support insulator 13.
And an air nozzle 17b is arranged on the side, and is connected to the air pipe 19a. The above air nozzle 17a
Generates the seal air 20a from above with respect to the support insulator 13 as shown in FIG. 2, and the air nozzle 17b from the side with respect to the support insulator 13 as shown in FIG.
0b is generated.

On the other hand, the air nozzle 18 is disposed, for example, above and below the power supply insulator 16 as shown in FIG. 1, and is connected to an air pipe 19b. The air nozzle 18 generates seal air from the power supply insulator 16 from above and below. The air pipes 19 a and 19 b are connected to an air pressure source (not shown) such as a compressor by a main pipe 19.
The solenoid valve 22 is connected to the solenoid valve 22 by a small-diameter pipe 23.
4 are provided in parallel. The solenoid valves 22 and 24 are controlled to open and close by a control device 25.

The control device 25 includes a DC high-voltage power supply 2.
Control 1 The DC high-voltage power supply 21 generates a DC high voltage in accordance with a control command from the control device 25, and applies the DC high voltage to the discharge electrode via the power supply insulator 16 as described above. Although not shown, the DC high-voltage power supply 21 boosts, for example, an AC voltage by a high-voltage transformer and rectifies a high voltage generated in a secondary coil thereof to obtain a DC high voltage. The voltage and current of the DC high-voltage power supply 21 are detected as a secondary-side converted value of the voltage of a voltage-dividing resistor provided on the transformer secondary side and the primary-side current, and input to the control device 25. Control device 25
When the electrostatic precipitator is started, a high voltage is generated from the DC high-voltage power supply 21 and applied to the electrodes, and the applied voltage and supply current to the electrodes are detected, and the operation state of the electric precipitator is changed. Monitoring.

The dampers 3a and 3b are provided with a solenoid valve 2.
6 and connected to the air pipe 27. Further, the water washing nozzle 4 is connected to a water pipe 29 via an electromagnetic valve 28. The opening and closing of the solenoid valves 26 and 28 is controlled by a control command from the control device 25. When the solenoid valve 28 is opened, the pressurized water flows from the water washing nozzle 4 to the dust collection passage,
Cleaning is performed by spraying on the electrode section and the like.

The control device 25 controls the opening and closing of the solenoid valves 22, 24, 26 and 28 by, for example, setting a program in a sequence control device and controlling the on / off time by a relay.

Next, the cleaning operation of the electric precipitator in the above embodiment will be described with reference to a timing chart shown in FIG. The control device 25 controls the solenoid valve 26 in the steady operation state.
, And the inlet-side dampers 3a and 3b are opened to perform the ventilation operation, and a DC high voltage is generated from the DC high-voltage power supply 21 and applied to the electrodes via the power supply insulator 16. Further, the control device 25 opens the solenoid valve 24 and closes the solenoid valve 22 as shown in FIGS. 4A and 4B, and pressurized air is supplied to the air nozzles 17 and 18 through the small-diameter pipe 23. Has been supplied. Thereby, the air nozzles 17, 1
8, pressurized air is blown to the outer periphery of the support insulator 13 and the power supply insulator 16, and the outer circumference of the support insulator 13 and the power supply insulator 16 is air-sealed to remove dust in the processing air.
16 so as not to adhere.

In order to prevent dust from adhering to the insulator during the normal operation as described above, the solenoid valve 24 is opened and the pressurized air is supplied through the small-diameter pipe 23. The number is small as shown in FIG.

In the above state, when an operation for instructing cleaning of the electrostatic precipitator is performed by a worker or by automatic operation, the controller 25 sets the solenoid valve 2 at time t0.
6 to output a "close command" to close the inlet damper 3a and the outlet damper 3b. At this time, the control device 25
As shown in FIGS. 4A and 4B, a “close command” is output to the solenoid valve 24 and an “open command” is output to the solenoid valve 22, and the air nozzle 1
Increase the amount of pressurized air supplied to 7,18. As a result, the air nozzles 17 and 18 strongly seal the outer periphery of the support insulator 13 and the power supply insulator 16 with air to prepare for water washing.

At the time t0, the controller 25 stops the application of the voltage from the DC high voltage power supply 21 to the electrode unit 2 as shown in FIG. 4 (e), and as shown in FIG. The electromagnetic valve 28 is opened to supply pressurized water, and pressurized water is sprayed from the water washing nozzle 4 to the dust collection passage, the electrode portion, and the like to start water washing. In this case, the portions of the support insulator 13 and the power supply insulator 16 are strongly sealed by seal air 20a, 20b or the like which is strongly blown from the air nozzles 17, 18. Therefore, the water from which the electrodes have been washed will
3 and the power supply insulator 16, the insulator 1
It can be prevented from adhering to 3 and 16.

When the cleaning operation is performed for a predetermined time, the control device 25 outputs a "close command" to the solenoid valve 28 at time t1 as shown in FIG. Is stopped and the cleaning operation is terminated.

Further, when the above-mentioned cleaning operation is completed, the control device 25, as shown in FIG.
, Charging of the electrode unit 2 is started, and an "open command" is output to the solenoid valve 26 to open the dampers 3a and 3b.
Start ventilation to the electric precipitator. Also, the control device 25
4A, the solenoid valve 22 is closed and the solenoid valve 24 is opened as shown in FIGS. 4A and 4B, and the amount of sealing air blown out from the air nozzles 17 and 18 is reduced to a steady state level as shown in FIG. Let it.

When the water washing operation is completed as described above, the electrostatic precipitator immediately shifts to a steady operation state. That is, during the water washing, the portions of the support insulator 13 and the power supply insulator 16 are air-sealed to prevent water droplets from adhering, so that there is no possibility that insulation of the insulator portion is reduced in the water washing process. Therefore, the step of drying the insulator portion is not required, and after the completion of the water washing, it can be restarted immediately to shift to the normal operation state.

Further, even in a steady state of operation, since the support insulator 13 and the power supply insulator 16 are air-sealed, dust can be prevented from adhering to the insulator. Therefore, when the dust collecting passage and the electrode portion are washed with water, the insulators 13 and 16 do not need to be washed. However, it is considered that even if the support insulator 13 and the power supply insulator 16 are air-sealed, the insulators 13 and 16 are blown out from the air nozzles 17 and 18 for a certain period of time, for example, about once a month. It is desirable to wash.

[0027]

As described above in detail, according to the present invention, in an electric precipitator for applying a high voltage to an electrode of an electric precipitator through a power supply insulator, a support insulator for supporting an electrode, An air blowing nozzle is installed near the insulator, and during normal operation, pressurized air is blown around the outer periphery of the support insulator and power supply insulator to air seal the insulator, so that dust adheres to the insulator. It is possible to eliminate the need for cleaning the insulator portion or to significantly reduce the number of times of cleaning.

Further, according to the present invention, when the electric precipitator is washed with water, pressurized air is blown to the outer periphery of the support insulator for supporting the electrode and the power supply insulator, and the support insulator and the power supply insulator are air-sealed. Water droplets are prevented from adhering to the insulator, so there is no danger that water drops will adhere to the insulator and insulation will not be reduced.There is no need for a drying process for the insulator. Can be shifted to a steady operation state.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of an electric dust collector according to an embodiment of the present invention.

FIG. 2 is a front view of a support insulator part in the embodiment.

FIG. 3 is a side view of a support insulator part in the embodiment.

FIG. 4 is a timing chart for explaining operations at the time of water washing and restarting in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dust collection unit 2 Electrode unit 3a Inlet side damper 3b Outlet side damper 4 Water washing nozzle 11 Electrode support plate 12 Electrode support rod 13 Support insulator 14 Support arm 15 Electrode unit casing 16 Power supply insulator (through insulator) 17, 17a, 17b, 18 Air nozzle 19 Main pipe 19a, 19b Air pipe 20a, 20b Seal air 21 DC high voltage power supply 22, 24 Solenoid valve 23 Small diameter pipe 25 Control device 26, 28 Solenoid valve 27 Air pipe 29 Water pipe

Claims (3)

[Claims] 1. An electrostatic precipitator for applying a high voltage to an electrode of an electric precipitator through a power supply insulator, wherein an outer periphery of the periphery of the support insulator supporting the electrode or the power supply insulator is air-sealed. An electric dust collector equipped with an air blowing nozzle. 2. An electrostatic precipitator for applying a high voltage to an electrode of the electric precipitator through a power supply insulator, wherein pressurized air is applied to a support insulator for supporting the electrode or an outer periphery of the power supply insulator. A method for preventing dust from adhering to an insulator of an electric dust collector, wherein the dust is attached to the insulator by spraying and air-sealing the supporting insulator or the power feeding insulator. 3. An electrostatic precipitator for applying a high voltage to an electrode of the electric precipitator through a power supply insulator, wherein the electric precipitator has a support insulator or a support insulator for supporting the electrode during water washing. A method for cleaning an electrostatic precipitator in which pressurized air is blown around an outer periphery of a power supply insulator, and the support insulator or the power supply insulator is air-sealed to prevent water drops from adhering to the insulator.