JPH08266841A - Dust removing device - Google Patents

Abstract

PURPOSE: To provide a dust removing device low in deposit and capable of reducing a problem due to the deposit. CONSTITUTION: The device is composed of nonwoven fabric 2 inactive against UV rays and photocatalyst activity, a photocatalyst 3 deposited or compounded to the nonwoven fabric 2 and a UV lamp 1 irradiating the UV rays to the nonwoven fabric. A dust captured with the nonwoven fabric 2 is decomposed and removed with the photocatalyst 3 which is deposited or compounded to the nonwoven fabric 2 and manifests catalytic activity by the UV rays from the UV lamp 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust removing apparatus for removing dust in a gas, particularly smoke particles of cigarettes.

[0002]

2. Description of the Related Art A dust removing device (dust collecting device) for removing dust in a gas, especially for general household use, is of a mechanical type using a mechanical filter such as non-woven fabric, or is a counter electrode by ionizing air. An electrostatic precipitator that traps is common.

[0003]

However, in the mechanical type, since dust is accumulated on the mechanical filter, the pressure loss greatly increases due to clogging for a long time or when a high concentration of dust is added. Therefore, regular mechanical filter cleaning and replacement work is required. In the case of an electrostatic precipitator, a large amount of dust accumulates on the counter electrode, and sometimes the accumulated dust causes an electrical short circuit between the discharge electrode and the counter electrode. When contained, it has a problem that odorous substances are released from the tar content.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dust removing device which has a small amount of deposits and can reduce the problems caused by the deposits.

[0005]

DISCLOSURE OF THE INVENTION The present invention, however, is directed to a non-woven fabric which is inactive against ultraviolet rays and photocatalytic activity, a photocatalyst carried on or incorporated in the non-woven fabric, and an ultraviolet ray for irradiating the non-woven fabric with ultraviolet rays The first characteristic of the lamp is that it is composed of a lamp, a substrate having a large number of air through holes, a nonwoven fabric held by this substrate, a combustion oxidation catalyst carried or blended in this nonwoven fabric, and the above substrate. The second feature is that it comprises a heating means for heating, a discharge part having a discharge electrode and a counter electrode for discharging by applying a high voltage, and a combustion oxidation catalyst layer formed on the counter electrode of the discharge part. And a heating means for heating the counter electrode, which is a third feature.

[0006]

According to the first feature of the present invention, the dust trapped by the non-woven fabric is decomposed and removed by the photocatalyst which is carried or blended in the non-woven fabric and exhibits catalytic activity by the ultraviolet rays from the ultraviolet lamp. Therefore, the accumulation of dust on the non-woven fabric can be reduced. This is especially effective for smoke-bearing smoke particles.

According to the second feature, the dust captured by the non-woven fabric is decomposed and removed by the combustion oxidation catalyst which is carried or blended in the non-woven fabric and exhibits catalytic activity when heated by the heating device. Therefore, it is possible to reduce the accumulation of dust on the nonwoven fabric. According to the third feature, the dust is electrically captured by the counter electrode and comes into contact with the combustion oxidation catalyst, and is decomposed and removed by the combustion oxidation catalyst whose catalytic activity is expressed by the heat of the counter electrode. ,
Therefore, the accumulation of dust can be reduced.

[0008] In any case, it is particularly effective when the dust is smoke particles containing tar components of cigarettes.

[0009]

EXAMPLES The present invention will be described in detail below with reference to the illustrated examples. In FIG. 1, reference numeral 2 in FIG. 1 is a nonwoven fabric, which is inactive to ultraviolet rays and photocatalytic oxidation activity. Has been. As the non-woven fabric 2 made of an organic material, a Teflon-based one can be preferably used. In addition, many inorganic materials and metallic materials are generally inactive against the oxidation activity of ultraviolet rays and photocatalysts, and various materials can be used. Those made of glass are preferable.

The non-woven fabric 2 carries or is blended with a photocatalyst 3 which exhibits oxidative decomposition activity when exposed to ultraviolet rays. As the photocatalyst 3, a raw material such as titanium oxide, zinc oxide, tin oxide, iron oxide, or activated carbon is blended as one kind or as a combination of two or more kinds. In addition, one or a plurality of ultraviolet lamps 1 for irradiating the nonwoven fabric 1 with ultraviolet rays are arranged on the upstream side when the air flow is sent to the nonwoven fabric 2. The ultraviolet lamp 1 may be a black light or a fluorescent lamp, but
Those that emit ultraviolet rays in the wavelength region of 85 nm or 240 nm are preferable. The distance between the ultraviolet lamp 1 and the nonwoven fabric 2 and the amount of light emitted from the ultraviolet lamp 1 are set so that an amount of ultraviolet rays effective for activating the photocatalyst 2 reaches the nonwoven fabric 1.

In this dust remover, however, the dust trapped by the nonwoven fabric 2, especially the tar content of cigarettes,
It is decomposed and removed by the oxidative activity developed in the photocatalyst 3 by the ultraviolet rays from the ultraviolet lamp 1, and therefore the amount of deposition on the nonwoven fabric 2 is reduced. Moreover, since it is decomposed and removed, no odor is released. Figure 2
Another embodiment is shown in FIG. Here, a heat-resistant inorganic or metallic non-woven fabric 5 is arranged on a substrate 6 which is electrically conductive and has a large number of air through holes, and the non-woven fabric 5 carries a combustion oxidation catalyst 4 or It is mixed. As the combustion oxidation catalyst 4, any catalyst may be used as long as it shows an oxidation activity in a temperature range from room temperature to about 300 ° C., but platinum, palladium, manganese dioxide and the like can be preferably used.

If a constant voltage is applied to the conductive substrate 6 to generate heat, the nonwoven fabric 5 and the combustion oxidation catalyst 4 are heated by this heat, and the oxidation activity of the combustion oxidation catalyst 4 is enhanced. . Therefore, the dust, especially the tar content, captured by the nonwoven fabric 4 is decomposed and removed by the oxidation activity of the combustion oxidation catalyst 4. As a method for heating the substrate 6, a heater heating method, an electromagnetic induction heating method, or the like may be used, and the method is not limited.

The embodiment shown in FIG. 3 is a cordierite,
The conductive layer 12 is formed on the inner wall of the support 11 composed of mullite, a ceramic such as an alumina composition, a metal such as aluminum and iron, a single-hole body such as paper, or a honeycomb-like porous body with a tungsten paste or the like. A layer of the combustion oxidation catalyst 13 is further formed on the conductive layer 12. Further, a discharge electrode 8 made of a metal wire such as tungsten or stainless is provided in the center of the hole. The shape of the holes may be any shape.

In this structure, when a high voltage is applied between the discharge electrode 8 and the conductive layer 12 as a counter electrode, the dust in the air passing through the hole is charged (ionized) on the conductive layer 12 which is the counter electrode. That is, on the layer of the combustion oxidation catalyst 13. Here, since the combustion oxidation catalyst 13 is heated by the heat generated by the application of the heat generation voltage to the conductive layer 12 and the heat generated by the above discharge, the oxidation activity is high, and therefore the combustion oxidation is performed. The dust on the catalyst 13 is promptly decomposed and removed.

Next, the deodorizing ability will be described with reference to specific examples and comparative examples. Example 1 Titanium oxide fine particles as a photocatalyst were supported on a nonwoven fabric made of glass fiber by using a Teflon adhesive. The size of the flow cross section is 250 x 250 mm. Four 20 W UV lamps were arranged at a point 120 mm upstream of the air flow. Then, the non-woven fabric carrying the UV lamp and the photocatalyst and the fan arranged on the downstream side of the non-woven fabric were covered with a casing to ensure that the introduced air passed through the non-woven fabric. The air volume was adjusted to 1.8 liters. A non-woven fabric carrying no photocatalyst was designated as Comparative Example 1. Example 2 A combustion oxidation catalyst layer was formed on a 120 × 100 mm stainless steel non-woven fabric by using a low temperature combustion oxidation catalyst paste containing manganese dioxide as a main component. As the substrate, a ceramic plate having an air through hole and having a thickness of 120 × 100 × 5 mm (aperture ratio of 76%) having nichrome wire arranged on the surface was used. An alternating current power was supplied to the nichrome wire, and the voltage was adjusted so that the surface temperature of the nonwoven fabric was about 270 ° C. In addition, a fan was placed on the downstream side, and the entire casing was covered with a casing so that the introduced air always passed through the nonwoven fabric. The air volume was adjusted to 1.8 liters / minute. Comparative Example 2 was a case where a non-woven fabric that did not carry a combustion oxidation catalyst was used. Example 3 A conductive layer was formed on the inner wall of each cell of a honeycomb structure having a cordierite composition of 120 cells / square inch by using a tungsten paste. The conductive layers of each cell are electrically connected to each other. A combustion oxidation catalyst layer was formed on the conductive layer using a low temperature combustion oxidation catalyst paste containing manganese dioxide as a main component. The film thickness of the conductive layer and the combustion oxidation catalyst layer was about 0.05 mm to 0.1 mm. Then, AC power is supplied between the conductive layers and the surface temperature of the conductive layers is 25
The voltage was adjusted to be 0 ° C. In addition, a discharge electrode made of a tungsten wire having a diameter of 0.8 mm is inserted and arranged in the cell for a length of 20 mm at the center of the cell, and a DC voltage of 8 to 10 kV is applied between the discharge electrode and the conductive layer. did. Further, a fan was arranged on the upstream side to casing the whole so that air could pass through each cell. The air volume was adjusted to 1.5 l / min. It should be noted that Comparative Example 3 was prepared without a combustion oxidation catalyst layer.

In each of the above examples, 10 cigarettes (mild seven) are burned daily / hour / day, and 30 sidestream smoke is produced.
It was introduced for a day, and the dust removal rates on the initial and 30th days were detected by a dust sensor. The dust removal rate is calculated by the following formula based on the amount of dust before and after the dust remover: Dust removal rate (%) = (inlet concentration-outlet concentration) x 100 /
Calculated as the inlet concentration. In addition, in order to see the re-emission of odor from tar, etc., in the vicinity of the exit on the 30th day, a 6-step odor intensity display method (0: odorless, 1: faint, 2: slightly strong, 3: strong, 4: Feeling very strong, 5: Feeling extremely strong). The results are shown in Table 1. In the device according to the present invention, the dust removal rate was not reduced and the odor was not re-released from the tar content even under the above load.

[0017]

[Table 1]

[0018]

As described above, according to the first feature of the present invention, the dust captured by the nonwoven fabric is
It is carried or blended on the non-woven fabric, and is decomposed and removed by the photocatalyst that exhibits catalytic activity by the ultraviolet rays from the ultraviolet lamp, and therefore the accumulation of dust on the non-woven fabric can be reduced. The required dust removal performance over a long period of time. Therefore,
This also reduces the time and effort required for cleaning and replacing non-woven fabrics.

Further, in the second feature, the dust captured by the non-woven fabric is decomposed and removed by the combustion oxidation catalyst which is carried or blended in the non-woven fabric and exhibits catalytic activity when heated by the heating device. This is also a thing that can obtain an excellent dust removal performance for a long time. Furthermore, in the third feature, the dust is electrically captured by the counter electrode and contacts the combustion oxidation catalyst, and is decomposed and removed by the combustion oxidation catalyst whose catalytic activity is expressed by the heat of the counter electrode, For this reason, excellent dust removal performance can be obtained over a long period of time, and the problem of electrical short circuit due to dust accumulation does not occur.

In addition, in any case, when the dust is smoke particles containing tar components of tobacco, it is particularly effective and does not cause a problem such as re-emission of odor.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment.

FIG. 2 is a schematic cross-sectional view of another embodiment.

FIG. 3 is a schematic cross-sectional view of another embodiment.

[Explanation of symbols]

 1 discharge part 2 discharge electrode 3 counter electrode 4 functional material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B01J 35/02 B01J 35/06 C 35/06 K B01D 53/36 J Z

Claims (3)

[Claims] 1. A dust remover comprising a non-woven fabric which is inactive against ultraviolet rays and photocatalytic activity, a photocatalyst carried or blended in the non-woven fabric, and an ultraviolet lamp for irradiating the non-woven fabric with ultraviolet rays. apparatus. 2. A substrate comprising a large number of air through holes, a non-woven fabric held by the substrate, a combustion oxidation catalyst carried or mixed in the non-woven fabric, and a heating means for heating the substrate. Dust remover. 3. A discharge part having a discharge electrode and a counter electrode for discharging by applying a high voltage, a combustion oxidation catalyst layer formed on the counter electrode of the discharge part, and a heating means for heating the counter electrode. Characteristic dust removal device.