JP3465158B2 - Electric dust collector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic precipitator, and more specifically, a photocatalyst is provided on a positive electrode and a negative electrode for collecting dust, and the photocatalyst reduces and removes dust collected on the positive electrode and the negative electrode. The present invention relates to an electric dust collector that facilitates the operation.

[0002]

2. Description of the Related Art A conventional electrostatic precipitator has the following methods for removing dust collected on a positive electrode and a negative electrode due to its use. The apparatus is periodically stopped, the dust collected on the positive electrode and the negative electrode is removed and collected by electrical or mechanical action, the dust is discharged to the outside of the apparatus, and the apparatus is operated again. The positive electrode and the negative electrode can be easily attached and detached from the inside of the apparatus main body, the positive electrode and the negative electrode are taken out and cleaned, and the positive electrode and the negative electrode are installed again in the apparatus main body (see Japanese Patent Laid-Open No. 62-273064). ). Further, a corrosion resistant conductive resin is provided on one surface of the substrate made of an insulating material, and a large number of holes communicating with the corrosion resistant conductive resin and the other surface of the substrate are provided to enhance cleaning durability ( See JP-A-6-254437).

[0003]

However, although the above-mentioned one can be used for an electrostatic precipitator for large-scale industrial use, it is not suitable for a small electrostatic precipitator used in an office or a home. It is not realistic because the device mechanism that gives a mechanical or mechanical action becomes complicated and expensive.
However, the positive electrode and the negative electrode are simply attached and detached from the inside of the main body of the electrostatic precipitator, and do not reduce the cleaning load of the positive electrode and the negative electrode. Use and much cleaning work must be done. Therefore, it encounters difficult situations such as treatment of chemicals used and consideration for cleaning. In addition, it is not possible to reduce the unpleasant odor at the time of starting the electrostatic precipitator except in the initial stage after cleaning the positive electrode and the negative electrode. Moreover, the ones only increase their durability against the use of various chemicals, which remains the same for the difficult situations mentioned above.

Therefore, the present invention has been made in view of the above circumstances, and can be applied to a small size, and the cleaning load of the positive electrode and the negative electrode, that is, the use of various chemicals can be suppressed as much as possible and the cleaning labor can be reduced. It is an object of the present invention to provide an electrostatic precipitator that has almost no odor and can reduce an unpleasant odor at startup.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 charges a fine particle in the air by corona discharge and collects the charged fine particle by Coulomb force. and in the electric precipitator device including a negative electrode, Ru provided a photocatalyst to the positive electrode and the negative electrode
Together with the positive electrode and the negative electrode with respect to the air flow direction
An auxiliary lamp for irradiating the photocatalyst is provided on the downstream side . Therefore, according to this feature, the photocatalyst on the positive electrode and the negative electrode, the light of wavelength necessary for this action, long by dirt difficult auxiliary lamp when necessary From
By fixedly receiving it, organic substances, nitrogen compounds, chlorine compounds, etc. of the fine particles adhering to the photocatalyst on the positive electrode and the negative electrode are decomposed and removed.

According to a second aspect of the invention, the photocatalyst is a superhydrophilic photocatalyst. Therefore, according to this feature, the contact angle between the superhydrophilic photocatalyst on the positive electrode and the negative electrode and water is almost eliminated, and the above-mentioned superhydrophilic photocatalyst becomes moisture in the air, that is, a state familiar with water, The contaminants attached to it are in a floating state, and are removed by an external force such as flowing water.

The invention according to claim 3 is characterized in that the positive electrode and the negative electrode are made of a material which is hardly decomposed with respect to the photocatalyst. Therefore, according to this feature, the positive electrode and the negative electrode are not decomposed by the photocatalyst.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
It will be described in detail based on ~ 4. FIG. 1 is a circuit diagram of an electrostatic precipitator to which an embodiment of the present invention is applied, and FIG. 2 is a sectional view of electrodes showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a two-stage type electrostatic precipitator. This electrostatic precipitator 1 comprises a charging unit 2 for charging fine particles in the air by corona discharge, and the fine particles charged by the charging unit 2. Dust collecting part 5 provided with positive electrode 3 and negative electrode 4 for collecting by Coulomb force
And a high-voltage power supply section 6 for applying a high voltage to the charging section 2 and the dust collecting section 5.

The charging section 2 is composed of an ionization wire 10 and an ionization electrode 11. The ionization wire 10 is a positive pole 12 of a corona power supply 6a of the high voltage power supply section 6, and the ionization electrode 11 is a negative pole 13 of the corona power supply 6a. Respectively connected to.

The dust collecting portion 5 comprises a positive electrode 3 and a negative electrode 4, the positive electrode 3 being a positive electrode 14 of a dust collecting power source 6b of the high voltage power source 6, and the negative electrode 4 being a negative electrode of the dust collecting power source 6b. Pole 1
5 are connected respectively. And the corona power supply 6a
The negative electrode 13 and the negative electrode 15 of the dust collecting power source 6b are both grounded.

Incidentally, the corona power source 6a of the high-voltage power source section 6
The voltage of the dust collecting power source 6b ranges from 2000 V to 50 V.
It is in the range of 00 volts.

The positive electrode 3 and the negative electrode 4 are constructed by covering the surface of the plate 20 made of metal with a photocatalyst 21. Therefore, the fine particles made of an organic substance, an oxidizable substance, or the like attached to the positive electrode 3 and the negative electrode 4 during the use of the electrostatic precipitator 1 are oxidized and decomposed by the action of the photocatalyst 21, and are reduced. 3 and the negative electrode 4 are easily separated.

The photocatalyst 21 is not particularly limited as long as it oxidizes an organic substance, an oxidizable substance, etc. by shining light. For example, titanium oxide is mainly used. It may be a semiconductor such as strontium titanate, cadmium sulfide or molybdenum sulfide. Incidentally, in the present invention, titanium oxide, anatase type titanium oxide, rutile type titanium oxide, amorphous titanium oxide, various titanium oxides such as hydrous titanium oxide, metatitanic acid, orthotitanic acid, hydrated titanium oxide, and various Says titanium hydroxide.

The positive electrode 3 and the negative electrode 4 both have a surface of a plate 20 made of metal, instead of the photocatalyst 21,
As shown in FIG. 3, it may be constituted by covering with a superhydrophilic photocatalyst 22. The superhydrophilic photocatalyst 22 is not particularly limited, and may be one which exhibits superhydrophilicity when exposed to light, or one which exhibits superhydrophilicity even when not exposed to light.

The superhydrophilic photocatalyst 22 is a combination of titanium oxide and a water-storing substance, for example, a silicon material, and when it is exposed to light, it undergoes a photocatalytic action (mainly an organic substance decomposing action), Hydrophobic substance (water repellent property) is decomposed to expose the hydroxyl group, and this hydroxyl group causes moisture in the air,
That is, water is taken in, and water is also taken in by the water-storing substance, and a water film at the molecular level is formed on the surface of the water-storing substance, which is stable without repelling water and retains high hydrophilicity. The adhered contaminants are lifted and removed by external force such as flowing water. The superhydrophilic action of the superhydrophilic photocatalyst 22 is maintained for a long time (tens of hours) even if it is not exposed to light.

The superhydrophilic photocatalyst 22 is a combination of titanium oxide and metal oxide.
Moisture and water in the air are taken in regardless of the presence of light, a water film at the molecular level is formed on the surface, it is stable without repelling water, high hydrophilicity is retained, and pollution attached on it The object floats and is removed by external force such as flowing water.

The positive electrode 3 and the negative electrode 4 are the photocatalyst 21.
Further, since it is in direct contact with the superhydrophilic photocatalyst 22, a material having a photocatalyst effect by the photocatalyst 21 and the superhydrophilic photocatalyst 22 and a material which is not easily decomposed is used.
Examples thereof include inorganic materials such as ceramics and glass, organic materials such as silicon-based resins and fluorine-based resins, and metal materials.

The method of covering the positive electrode 3 and the negative electrode 4 with the photocatalyst 21 and the superhydrophilic photocatalyst 22 is not particularly limited. For example, with respect to the photocatalyst 21, an adhesive containing the photocatalyst 21 is applied to the surface of a material 20 that is hard to oxidize and decompose, that is, the surface of the stainless steel plate 20. The adhesive is a material that is oxidatively decomposed by the photocatalyst 21, such as an acrylic resin, an alkyd melamine resin, vinyl acetate, an epoxy resin, and an ultraviolet curable resin. The adhesive is decomposed and removed by exposing the coated surface to light including ultraviolet rays. ,
It is advisable to expose the photocatalyst 21. Furthermore, the material that is oxidatively decomposed by the photocatalyst 21, that is, the surface of the plate 20 exemplified as the adhesive is made of silicon resin, fluorine resin or the like, and the adhesive containing the photocatalyst 21 is applied. May be.

In the photocatalyst 21 or the superhydrophilic photocatalyst 22 on the positive electrode 3 and the negative electrode 4 in the electrostatic precipitator 1,
If the light does not suffice, it is necessary to provide an auxiliary lamp 23, such as a fluorescent lamp, which emits light having a wavelength necessary for the photocatalytic action, on the downstream side of the positive electrode 3 and the negative electrode 4, as shown in FIG. is there. The reason for providing the auxiliary lamp 23 on the downstream side is to reduce the adhesion of fine particles in the air to the auxiliary lamp 23, and to stably irradiate the photocatalyst 21 on the positive electrode 3 and the negative electrode 4 with light. is there.

Next, a method of using the electrostatic precipitator 1 having the above structure will be described. Air containing fine particles enters the electrostatic precipitator 1 from the direction of arrow A in FIG. 1, charges the fine particles in the air by the corona discharge of the charging unit 2, and further enters the dust collecting unit 5 and its positive electrode. The charged fine particles at 3 and the negative electrode 4 are collected by the Coulomb force. When the positive electrode 3 and the negative electrode 4 are irradiated with light having a wavelength necessary for performing a photocatalytic action, the photocatalyst 21 oxidizes and decomposes the collected fine particles such as an organic substance and an oxidizable substance. Since most of the organic substances become gas, they disappear from the positive electrode 3 and the negative electrode 4, and the oxidizable substance also becomes a stable oxide and becomes harmless, and the positive electrode 3 and the negative electrode 4 can be made by a slight impact or washing with water. Fall from the top. Further, since the fine particles of the organic substance, the oxidizable substance, and the like collected on the positive electrode 3 and the negative electrode 4 are oxidatively decomposed, when the electrostatic precipitator 1 is started, the organic substance and the oxidizable substance are oxidizable. Almost no odor derived from substances. If necessary, a photocatalytic action is provided by the auxiliary lamp 23.
It supplies the light of the wavelength necessary for

If the positive electrode 3 and the negative electrode 4 are provided with the superhydrophilic photocatalyst 22, the photocatalytic action works even if the light of the wavelength necessary for the photocatalytic action is not constantly applied, and the humidity in the air is increased. In other words, water is taken in, a water film at the molecular level is formed on its surface, and it stabilizes without repelling water,
The high hydrophilicity is maintained, and the contaminants attached to it are in a floating state and removed by an external force such as flowing water, so that the positive electrode 3 and the negative electrode 4 can be easily cleaned.

[0022]

As described in detail above, the electrostatic precipitator of the present invention has the following effects. The invention of claim 1, the photocatalyst on the positive electrode and the negative electrode, the light of wavelength necessary for this action, hard dirt optionally auxiliary
By being stably received by the lamp for a long time, organic substances, nitrogen compounds, chlorine compounds, etc. in the fine particles adhering to the photocatalyst on the positive electrode and the negative electrode are decomposed and removed. Therefore, decrease the frequency of cleaning of the positive and negative electrodes, and a new start time, organic matter, nitrogen compounds, odor derived from chlorine compounds and the like Ri extremely small, in addition, Qing auxiliary lamp
Scavenging frequency also decreases, and it is necessary and stable for a long time when needed for photocatalyst
There is an effect that can be irradiated with light of a wavelength.

According to the second aspect of the present invention, the contact angle between the superhydrophilic photocatalyst on the positive electrode and the negative electrode and water is almost eliminated, and the superhydrophilic photocatalyst is in a state of being familiar with the humidity in the air, that is, water. Then, the contaminants attached to it are in a floating state, and are removed by an external force such as flowing water. Therefore, the cleaning work of the positive electrode and the negative electrode is facilitated, and the odor originating from organic substances, nitrogen compounds, chlorine compounds and the like is reduced at the time of new starting.

According to the invention of claim 3, the positive electrode and the negative electrode are not decomposed by the photocatalyst. Therefore, in addition to the above effects, the positive electrode and the negative electrode can be used for a long time.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an electrostatic precipitator to which an embodiment of the present invention is applied.

FIG. 2 is a sectional view of an electrode showing an embodiment of the present invention.

FIG. 3 is a sectional view of an electrode showing an embodiment of the present invention.

FIG. 4 is a side view of a use state of the electrode according to the embodiment of the present invention.

[Explanation of symbols]

1 Electric dust collector 2 Charged part 3 positive electrode 4 Negative electrode 5 Dust collector 6 High voltage power supply 6a Corona power supply 6b Dust collection power supply 10 Ionization line 11 Ionization electrode 12, 14 plus pole 13, 15 negative pole 20 plates 21 Photocatalyst 22 Super hydrophilic photocatalyst 23 Auxiliary light

Claims (3)

(57) [Claims] 1. An electrostatic precipitator comprising a positive electrode and a negative electrode for charging fine particles in air by corona discharge and collecting the charged fine particles by Coulomb force. a photocatalyst provided on the Rutotomoni, sky
Downstream of the positive and negative electrodes with respect to the direction of air flow
An electrostatic precipitator comprising an auxiliary lamp for irradiating the photocatalyst . 2. The electrostatic precipitator according to claim 1, wherein the photocatalyst is a superhydrophilic photocatalyst. 3. The electrostatic precipitator according to claim 1 or 2, wherein the positive electrode and the negative electrode are made of a hardly decomposable material for a photocatalyst.