JP2000279846A - Electric precipitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an electrode set easy to install in and remover from a case. SOLUTION: Dust collecting electrodes 4 and discharge electrodes 5 are supported by terminal dust collecting electrodes 6X to constitute an electrode set. The electrode set is made easy to install in and remove from a case 8 by providing cantilevered wheels 22 to the terminal dust collecting electrodes of the electrode set and, by the cantilevered wheels 22 wherein only one ends of wheel shafts are supported, it is unnecessary to support wheels 22a from the outside and a wheel support structure is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic precipitator for collecting fine particulate matter in an inflowing gas.

[0002]

2. Description of the Related Art For example, in a road tunnel, an electric precipitator for treating exhaust gas generated from a vehicle or the like is installed for the purpose of improving the visibility of a vehicle driver and environmental measures such as ventilation of air in the tunnel. You. As an electric precipitator adopted as this electric precipitator for tunnels, for example, the one described in JP-A-10-28897 is known.

The electrostatic precipitator disclosed in this publication is a so-called two-stage electric precipitator in which a charging section and a collecting section are disposed downstream of the charging section along the flow of exhaust gas flowing from inside the tunnel. It is a dust device. Each of the charging unit and the collecting unit of the electric dust collector includes a flat dust collecting electrode extending in the gas flow direction and a flat discharging electrode facing the dust collecting electrode.

[0004] A large number of dust collecting electrodes and discharge electrodes constituting a charging unit and a collecting unit are arranged in a case (housing).
It is supported by the electrode support and fixed to the case.

[0005] In the electric dust collector for tunnels, it is required that the dust collecting electrode and the discharge electrode be put in and out of the case for maintenance (maintenance and inspection).

Here, there is known an electric precipitator in which a wheel is attached so that a precipitating electrode and a discharging electrode can be taken in and out of a case. The electric dust collector provided with the wheels has a configuration in which both ends of the wheel shaft are supported in consideration of the fact that the total weight of the dust collection electrode and the discharge electrode is heavy.

[0007]

However, the wheel supporting structure for supporting both ends of the wheel axle has a structure in which both ends of the wheel axle are supported by holding the wheel from the inside and the outside thereof by the wheel axle supporting hardware. In addition, there is a problem that it is not possible to reduce the size of the device in the wheel axis direction (the width direction of the device; the direction in which the electrodes are arranged).

Further, the wheel supporting structure for supporting both ends of the wheel shaft is complicated, and there is a problem that the cost of the apparatus is increased.

The present invention has been made to solve such a problem, and an object of the present invention is to provide an electric precipitator capable of reducing the size and cost of the apparatus.

[0010]

According to the present invention, there is provided an electrostatic precipitator having a flat plate-shaped precipitating electrode extending in the flow direction of an inflowing gas and arranged to face each other, and disposed between the precipitating electrodes. In the electrostatic precipitator provided in the case, the end collecting electrode located at the outermost side of the collecting electrode in the direction in which the electrodes are arranged, supports the collecting electrode and forms the discharging electrode. The present invention is characterized in that an electrode set is constituted by supporting it through an insulator, and a cantilever wheel is provided at an end dust collecting electrode of the electrode set so that the electrode set can be taken in and out of a case.

According to the thus configured electric dust collecting apparatus, the end dust collecting electrode supports the dust collecting electrode and the discharge electrode to form an electrode set. By providing the cantilever wheel, the electrode set can be put in and out of the case. Since the cantilever wheel has a configuration in which only one end of the wheel shaft is supported, it is not necessary to support the wheel from the outside, and the wheel support structure is simplified.

Here, an electrostatic precipitator having a charging section and a collecting section, that is, a charging section for giving a charge to the particulate matter in the flowing gas, and a particulate matter charged through the charging section And a collecting unit for collecting
The charging unit and the collection unit each extend in the gas flow direction and are arranged in such a manner that they face each other.
In the electric precipitator including the discharge electrode disposed between the precipitating electrodes, the end precipitating pole of the precipitating pole located at the outermost side in the electrode juxtaposition direction is captured as the charging unit. Common to the collecting part, the dust collecting electrode of the charging part and the collecting part is supported by the common end dust collecting electrode, and the discharging electrode of the charging part and the collecting part is shared by the insulator via the insulator. An electrode set is constituted by supporting the end dust collecting electrode provided, and a cantilever wheel is provided at the end dust collecting electrode so that the electrode set can be taken in and out of the case.

[0013] According to the thus configured electric dust collecting apparatus, the end portion dust collecting electrode shared by the charging portion and the collecting portion, and the dust collecting electrode and the discharging electrode of the charging portion and the collecting portion are arranged. An electrode set is supported and configured, and a cantilever wheel is provided at the common end dust collecting electrode of the electrode set, so that the charging unit and the collecting unit can be integrally taken in and out of the case. You. Because this cantilever wheel is configured to support only one end of the wheel axle,
The need to support the wheel from the outside is eliminated and the wheel support structure is simplified.

Further, as another configuration of an electric precipitator provided with a charging section and a collecting section, in each area of the charging section and the collecting section, a position is set at the outermost position in the electrode juxtaposition direction of the dust collecting electrodes. An end dust collection electrode that supports the dust collection electrode and supports the discharge electrode via an insulator to form an electrode set, and the charging section electrode set is attached to the end collection electrode of the charging section electrode set. In addition to providing a cantilever wheel that can be taken in and out of the case, a cantilever wheel that allows the collection electrode set to be taken in and out of the case is provided at an end dust collecting electrode of the collection electrode set. A configuration is also employed.

According to the thus configured electric dust collector, in each area of the charging unit and the collecting unit, the dust collecting electrode and the discharge electrode are supported by the end dust collecting electrode to form an electrode set. By providing a cantilever wheel at the end dust collecting electrode of each electrode set, the charging section electrode set and the collecting section electrode set can be separately put in and out of the case. Therefore, maintenance or the like after pulling out is facilitated. Further, since the cantilever wheel has a configuration in which only one end of the wheel shaft is supported, it is not necessary to support the wheel from the outside, and the wheel support structure is simplified.

Here, as the cantilever wheel, specifically, for example, a needle roller bearing track roller is employed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In each of the drawings, the same elements are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a front view showing an electrostatic precipitator according to an embodiment of the present invention, which is a front view mainly showing a charging section. FIG. 2 is a sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along line CC of FIG. 1, and FIG. 4 is a cross-sectional view taken along line DD of FIG. The dust device is a tunnel electric dust collector used for a tunnel.

As shown in FIG. 1 to FIG.
Includes a box-shaped case 8 as a housing. This case 8 is passed through a ventilation fan (not shown) on the front side (FIG. 1).
A gas inlet 8a is formed at the front and a gas outlet 8b is formed at the rear in order to allow exhaust gas to flow in from the front side of the drawing).

Inside the case 8, as shown in FIG.
Along with the flow direction B of the gas flowing from the gas inlet 8a, the charging unit 2 that gives an electric charge to the particulate matter in the gas is arranged, and the charging unit 2 is disposed downstream of the charging unit 2. A collecting unit 3 for collecting the particulate matter that has passed through and charged is disposed, and a charging unit 2 and a collecting unit 3 having the same configuration are further arranged in a row above the charging unit 2 and the collecting unit 3. You. That is, the electric dust collector 1 of the present embodiment is a unit in which a so-called two-stage electric dust collector composed of the charging unit 2 and the collecting unit 3 is vertically stacked in two stages.

As shown in FIG. 3 and FIG.
A plurality of rectangular flat plate-shaped dust collecting electrodes 6 extending along the gas flow direction B are provided so as to face each other in a direction perpendicular to the gas flow direction B (a direction perpendicular to the plane of FIG. 3). , 6 is provided with a substantially rectangular flat discharge electrode 7 facing the dust collection electrode 6.

The dust collecting electrodes 6 and 6 arranged in the electrode juxtaposing direction (the horizontal direction in FIGS. 1 and 4) are
, And are bound to the end dust collecting electrodes 6X, 6X of the dust collecting electrodes 6 which are located on the outermost side in the electrode juxtaposition direction. The end dust collecting electrode 6X is a large rectangular flat plate that is common to all of the lower collecting unit 3 and the charging unit 2 and the upper collecting unit 3 and the charging unit 2. In addition, as a usage form of the end part dust collecting electrode, the end part dust collecting electrode of the charging part and the end part dust collecting electrode of the collecting part may be used separately.

As shown in FIG. 3, the dust collecting electrode support fitting 14 is inserted through the large-diameter dust collecting electrode supporting fitting through hole 7a formed in the discharge electrode 7, as shown in FIG. Insulation with the discharge electrode 7 is ensured.

On the other hand, as shown in FIGS. 3 and 4, the discharge electrodes 7, 7 arranged in the
2 and 4, as shown in FIGS.
Of the end discharge electrodes 7 located at the outermost side in the electrode juxtaposition direction
X, 7X. The end discharge electrode 7X is arranged further outward than the end dust collection electrode 6X in the electrode juxtaposition direction.

As shown in FIG. 3, the discharge electrode supporting bracket 15 is inserted through the large diameter discharge electrode supporting through hole 6a formed in the dust collecting electrode 6, as shown in FIG. Insulation with the dust collecting electrode 6 is ensured.

FIGS. 2 and 4 show the outer wall of the end discharge electrode 7X.
As shown in FIG. 5, an outwardly projecting discharge electrode bracket 7Y is formed, and on the outer wall of the end portion dust collection electrode 6X, a dust collection electrode bracket that protrudes outwardly and is disposed below and opposed to the discharge electrode bracket 7Y. 6Y are formed, and these brackets 6
An insulator 30 is provided between Y and 7Y. That is,
The end discharge electrode 7X is connected to the end dust collection electrode 6X while ensuring insulation. Thus, a collection unit electrode set is configured.

On the other hand, the charging unit 2 has substantially the same configuration as the collection unit 3, and as shown in FIGS. 1 and 3, the dust collection electrode 6, the discharge electrode 7 of the collection unit 3 and the gas flow direction B. A rectangular plate-shaped dust collecting electrode 4, a rectangular plate-shaped discharge electrode 5, and an end discharge electrode 5 of the discharge electrode 5 which is located at the outermost side in the electrode juxtaposition direction.
X is provided.

The dust collecting electrode 4 is a rectangular flat plate extending in the vertical direction and commonly used by the upper and lower charging units 2 and 2.
The dust collecting electrodes 4 and 4 arranged in the direction in which the electrodes are arranged are supported by the dust collecting electrode support bracket 12 and bound to the end dust collecting electrodes 6X and 6X.

On the other hand, on the discharge electrode 5, at least the upstream end and the downstream end of the gas are provided with protrusions for generating corona discharge at least at the upstream end. The discharge electrodes 5, 5 arranged in the electrode juxtaposition direction are supported by a discharge electrode support bracket 13 as shown in FIGS. 1 and 3, and as shown in FIGS. 1 and 2,
It is bound to the end discharge electrodes 5X, 5X. Electrode support bracket 1
As shown in FIG. 3, the dust collection electrode 4 is inserted through the through hole 4 a for the discharge electrode support bracket, thereby securing insulation from the dust collection electrode 4.

As shown in FIGS. 1 and 2, the discharge electrode bracket 5Y formed on the outer wall of the end discharge electrode 5X and the lower end of the end dust collection electrode 6X opposed to the discharge bracket 5Y are formed. By mounting the insulator 31 between the dust collecting electrode bracket 6Z and the dust collecting electrode bracket 6Z, the end discharge electrode 5X is connected to the end dust collecting electrode 6X while ensuring insulation.
Thus, a charging unit electrode set is formed.

As described above, the upper-stage charging unit electrode set, the lower-stage charging unit electrode set, and the upper-stage charging unit electrode set 6X, 6X shared by the upper and lower charging units 2 and the collecting unit 3 are used. The collecting part electrode set and the lower collecting part electrode set, that is, the entire electrode set are supported.

Further, as shown in FIG. 3, the dust collecting electrode 4 of the charging unit 2 and the dust collecting electrode 6 of the collecting unit 3 are grounded, respectively, and the discharge electrode 5 of the charging unit 2 and the discharging electrode of the collecting unit 3 are grounded. 7 is connected to high-voltage DC power supplies 10 and 11 respectively, and a negative high-voltage DC voltage (a positive high-voltage DC voltage may be used but is assumed to be negative for the sake of explanation) is applied to each.

As a result, corona discharge occurs between the collection electrode 4 and the discharge electrode 5 in the charging section 2, and the collection section 6
An electrostatic field as a uniform electric field is formed between the electrode and the discharge electrode 7, and the particulate matter in the flowing gas passes through the charging unit 2 and is given an electric charge (negative ion). The particulate matter is collected by the dust collecting electrode 6 including the end dust collecting electrode 6X by the action of the electrostatic field of the collecting part 3.

In this embodiment, the high-voltage DC power supply 11
Is higher than the high-voltage DC power supply 10, and the potential of the collection unit 3 is higher than that of the charging unit 2. However, the voltage may be opposite to the above, or may be the same. Although the high-voltage DC power supply has two power supplies, depending on the plate size and discharge characteristics,
It may be a power supply.

The area between the end dust collecting electrodes 6X, 6X is
The charging unit 2 has a substantial charging area, and the collecting unit 3 has a substantial collecting area.
An inlet introduction path for introducing gas is provided between the end dust collecting electrodes 6X, 6X of the charging unit 2, and the end dust collecting electrodes of the charging unit 2 and the collecting unit 3 are provided downstream of the collecting units 3, 3. An outlet discharge path is provided to guide the gas passing between 6X and 6X backward.

In the present embodiment, in particular, FIG.
As shown in FIG. 2 and FIG. 4, a plurality of cantilever wheels 22 are provided below the end dust collecting electrodes 6X, 6X. Specifically, the cantilever wheel 22 is a needle roller bearing track roller (stud type), and the cantilever wheel 22 receives the load of the entire electrode set. The needle roller bearing track rollers 22 are excellent in load resistance, and can receive the load of the entire electrode set in a distributed manner by arranging an appropriate number of them.

The structure of the cantilever wheel 22 and the support structure of the cantilever wheel 22 will be specifically described. As shown in FIG. 5, the cantilever wheel 22 has a needle 22a as a needle roller bearing (not shown). Via a cantilever shaft (wheel shaft) 22b. The cantilever shaft 22b is attached to an angle-shaped mounting member 6T provided below the end dust collecting electrode 6X.
And a screw 22e at the end on the penetrating side. The screw 22e is connected to the nut 2 via a spring washer 22c.
By screwing 2d, the cantilever shaft 22b is fixedly supported by the end dust collecting electrode 6X in a cantilever manner. This cantilever wheel 22
Are arranged at positions and in numbers along the gas flow direction B of the end dust collecting electrode 6X so as to optimally distribute the load of the entire electrode set. Incidentally, in this embodiment, as shown in FIG. 2, three cantilever wheels 22 are provided on one end dust collecting electrode 6 </ b> X,
A total of six cantilever wheels 22 are provided.

On the other hand, the case 8 has a base 20 as a pedestal at its lower part, as shown in FIGS. Guide rails 21 extending in the gas flow direction B are arranged on both ends of the base 20 in the electrode juxtaposition direction, and the wheels 22a are mounted on the guide rails 21. I have. That is, the entire electrode set
It is placed and supported on a guide rail 21 via a cantilever wheel 22, and can be taken in and out of the case 8 using the guide rail 21 as a guide.

The cantilever wheels 22 supported by the end dust collecting poles 6X, 6X are electrically grounded via the guide rails 21 and the base 20.
Is also grounded, so there is no electrical problem.

According to the thus configured electric dust collecting apparatus 1, since the cantilever wheels 22 are provided on the end dust collecting electrodes 6X, 6X that support the entire electrode assembly, it is necessary to perform maintenance or the like. In addition, the cantilever wheel 22 allows the entire electrode set to be easily inserted into and removed from the case 8.

In particular, the cantilever wheel 22 includes a cantilever shaft 22b.
Since only one end is supported, there is no need to support the wheel 22a from the outside (outside in the direction in which the electrodes are arranged), and the wheel support structure is simplified, so that the size and cost of the device can be reduced. Can be achieved.

Although the present invention has been specifically described based on the embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, the charging unit 2 and the collecting unit 3 However, if the charging unit 2 and the collecting unit 3 are integrated, it is difficult to perform maintenance after the charging unit 2 and the collection unit 3 are integrated. If it is desired to solve this, the end dust collection electrode 6X is not shared by the charging unit 2 and the collection unit 3 and the end collection electrode 3 of the charging unit 2 and the end collection of the collection unit 3 are not used. What is necessary is just to divide into a dust pole. In this case, a cantilever wheel 22 that enables the charging unit electrode set to be inserted into and removed from the case 8 is provided at an end dust collecting electrode of the charging unit electrode set, and the collection unit electrode set is inserted into and removed from the case 8. The cantilever wheel 22 that can be used is provided at the end dust collecting electrode of the collecting part electrode set. At this time, a number of cantilever wheels corresponding to the load are attached to each end dust collecting electrode of the charging unit 2 and the collecting unit 3 so that both the charging unit 2 and the collecting unit 3 can be put in and taken out properly. Needless to say, it is provided.

In the above embodiment, the charging unit 2
Although the collecting unit 3 is vertically stacked in two stages, the present invention can of course be applied to an electrostatic precipitator having three or more stacked units or one stage. Further, the present invention can be applied to a multi-stage type electrostatic precipitator in which a plurality of charging units 2 and collection units 3 are arranged in series along the gas flow direction B.

In the above embodiment, the charging unit 2
And two-stage type with a trapping unit 3 (meaning two stages in the gas flow direction)
Is described, but the present invention can also be applied to a so-called one-stage type electrostatic precipitator in which the charging unit 2 and the collecting unit 3 are also used. In this case, the end collection electrode located at the outermost side of the dust collection electrode in the direction in which the electrodes are arranged is configured to support the collection electrode and support the discharge electrode via an insulator to form an electrode set. And, at the end dust collecting electrode of this electrode set,
A cantilever wheel 22 that allows the electrode set to be inserted into and removed from the case is provided.

The discharge electrode is not limited to a flat discharge electrode, but may be a wire discharge electrode.

Furthermore, in the above-described embodiment, the electric dust collecting device is a tunnel electric dust collecting device which is particularly effective when applied to a tunnel in which it is required to put an electrode set into and out of the case. It can also be adopted as an air purifier or for removing exhaust dust from a diesel engine.

[0047]

According to the electric dust collecting apparatus of the present invention, the end dust collecting electrode supports the dust collecting electrode and the discharge electrode to form an electrode set, and the end dust collecting electrode of the electrode set has a cantilever wheel. Is provided, the electrode set can be taken in and out of the case, and the cantilever wheel that supports only one end of the wheel shaft eliminates the need to support the wheel from the outside and simplifies the wheel support structure. With such a configuration, it is possible to easily put the electrode set into and out of the case, and it is possible to reduce the size and cost of the device.

Further, the electrostatic precipitator provided with the charging section and the collecting section of the present invention is an end dust collecting electrode common to the charging section and the collecting section, and the dust collecting electrode of the charging section and the collecting section. And a discharge electrode are supported to form an electrode set, and a cantilever wheel is provided at the common end dust collecting electrode of the electrode set, so that the charging unit and the collecting unit can be integrally taken in and out of the case. In addition, the cantilever wheel, which supports only one end of the wheel shaft, eliminates the need to support the wheel from the outside and simplifies the wheel support structure. It is possible to make it easy to put in and take out of the case, and it is possible to reduce the size and cost of the device.

Further, in the electric dust collecting apparatus having the charging section and the collecting section according to the present invention, in each area of the charging section and the collecting section, the end collecting pole supports the dust collecting electrode and the discharging electrode. By providing a cantilever wheel at the end dust collecting electrode of each electrode set, it is possible to separately put the charging unit electrode set and the collecting unit electrode set into and out of the case, and With a cantilever wheel in which only one end of the shaft is supported, the need to support the wheel from the outside is eliminated and the wheel support structure is simplified, so that the charging unit electrode set and the collection unit electrode set are used. This makes it easy to put in and take out the case, makes it possible to reduce the size and cost of the device, and also makes it easier to perform maintenance on each electrode set after the electrode set is pulled out. Can be.

[Brief description of the drawings]

FIG. 1 is a front view showing an electrostatic precipitator according to an embodiment of the present invention, and is a front view mainly showing a charging unit.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line CC of FIG. 1;

FIG. 4 is a cross-sectional view taken along the line DD of FIG. 2 and is a cross-sectional view mainly showing a trapping portion.

FIG. 5 is a partially cutaway detailed view of a portion X in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric dust collector for tunnels (electric dust collector), 2 ... Charging part, 3 ... Collection part, 4 ... Dust collection electrode of charging part, 5 ... Electrode discharge electrode of charging part, 6 ... Collection of collection part Dust electrode, 6X ... Dust collection electrode at the end, 7 ...
Discharge electrode of the collecting part, 8 ... case, 12, 14 ... dust collecting electrode support fitting, 13, 15 ... discharge electrode support fitting, 22 ... cantilever wheel, 30, 31 ... insulator, B ... gas flow direction.

Claims (4)

[Claims] 1. An electric collector comprising a flat plate-shaped dust collecting electrode extending in the flow direction of an inflowing gas and facing each other, and a discharge electrode arranged between the dust collecting electrodes in a case. In the dust collector, an end dust collecting electrode located at the outermost side of the dust collecting electrode in the electrode juxtaposition direction supports the dust collecting electrode and supports the discharge electrode via an insulator to form an electrode assembly. An electric dust collecting apparatus comprising: a cantilever wheel provided at an end dust collecting electrode of the electrode set so that the electrode set can be taken in and out of the case. 2. A case, comprising: a charging unit for providing a charge to particulate matter in a gas flowing therein; and a collection unit for collecting the charged particulate matter passing through the charging unit, The charging unit and the collection unit each include a plate-shaped dust collection electrode extending in the gas flow direction and arranged to face each other, and a discharge electrode arranged between the dust collection electrodes. In the electrostatic precipitator, the end portion of the precipitating electrode located at the outermost side in the electrode juxtaposition direction is shared by the charging portion and the collecting portion, and the charging portion and the collecting portion And the discharge electrode of the charging unit and the collection unit is supported by the common end dust collection electrode via an insulator. To form an electrode set, and the electrode set can be taken in and out of the case with respect to the end dust collecting electrode. An electric dust collector equipped with cantilever wheels. 3. A case, comprising: a charging unit for providing a charge to the particulate matter in the flowing gas; and a collecting unit for collecting the charged particulate matter passing through the charging unit in a case. The charging unit and the collection unit each include a plate-shaped dust collection electrode extending in the gas flow direction and arranged to face each other, and a discharge electrode arranged between the dust collection electrodes. In the electrostatic precipitator, in each area of the charging unit and the collection unit, the end collection electrode located at the outermost side of the collection electrodes in the electrode juxtaposition direction supports the collection electrode. A cantilever wheel for supporting the discharge electrode via an insulator to form an electrode set, and allowing the charging section electrode set to be inserted into and removed from the case at an end dust collecting electrode of the charging section electrode set. And the collecting part electrode set is attached to the end dust collecting electrode of the collecting part electrode set. An electric precipitator provided with a cantilever wheel which can be put in and taken out of a base. 4. The electrostatic precipitator according to claim 1, wherein said cantilever wheel is a needle roller bearing track roller.