JPH01293876A - Deodorizing apparatus by photocatalyst - Google Patents

Abstract

PURPOSE:To effectively perform the decomposition of a malodor by photocatalystic action, by constituting the title apparatus of an electric lamp emitting ultraviolet rays, a semiconductor catalyst layer rotating around the electric lamp and formed inside a cylinder and a blower for sending air containing an offensive smell into the catalyst layer. CONSTITUTION:When an electric lamp 1 is allowed to light while a cylinder 3 is rotated, a semiconductor catalyst layer 4 is excited. When air containing an offensive smell is sent in said catalyst layer inside the cylinder by a sirocco fan 5 through a guide 7, turblent flow is generated in the vicinity of the semiconductor catalyst layer 4 and the offensive odor is diffused through the semiconductor catalyst layer 4 to be subjected to oxidative decomposition on the surface thereof. That is, a nitrogen compound such as ammonia or amines, a sulfur compound such as hydrogen sulfide or mercaptan, aldehydes, ketones, alcohols, fatty acids and an aromatic compound being substances causing offensive smells receive oxidation to be decomposed into carbon dioxide, water, nitrogen oxide, sulfur oxide or the like. The deodorized air is emitted from a blowoff port 9.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a photocatalyst that removes odors generated in homes, offices, etc., such as toilet odor, vent odor, tobacco odor, cooking utensil odor, and body odor. This relates to a deodorizing device by the company.

Conventional technology Bad odor components such as toilet odor, toilet odor, cigarette odor, cooking utensil odor, body odor, etc. that occur in homes and offices are ammonia, amines, indole, nitrogen compounds such as skatole, hydrogen sulfide, Methyl mercaptan, methyl sulfide,
Sulfur compounds such as methyl disulfide, artechites,
There are a wide variety of components, from low to high boiling points, such as alcohols, fatty acids, and aromatic compounds.

Conventional deodorizing devices used in homes and offices combine adsorbents such as activated carbon and zeolite, or deodorizers with chemicals attached to these adsorbents, and a blower to remove bad odors from the room. into the device,
Most of them were adsorbents or deodorizers that adsorbed or reacted with bad odors to make them odorless. However, in this case, there is a limit to the adsorption capacity of the adsorbent or deodorizer, and as the capacity gradually decreases, it may be necessary to replace it with a new one. In the second case, the timing of replacement cannot be determined by looking at the appearance, so either one can determine the replacement period based on the sensual feeling of how well the odor has been removed, or it can be replaced based on the approximate usage period, but either way, it is a hassle.

Therefore, as a method that requires very little replacement or does not require replacement, an attempt may be made to deodorize using photocatalytic action, in which when UV light is applied to a semiconductor such as 1H titanium acid, the 2R conductor is excited and the organic matter is oxidized and decomposed. One of the conventional examples is shown in FIGS. 12 to 14.

Fig. 12 is a perspective view of a conventional deodorizing device, and Fig. 13 is a perspective view of a conventional deodorizing device.
FIG. 2 is a cutaway plan view of the main part of the deodorizing device shown in FIG. 2, and FIG. 14 is a perspective view of the main part of the reaction chamber shown in FIG. 12. In the figure, 21 is a base, 22 is an electric lamp that generates ultraviolet rays, and 2
3 is a reaction chamber, 24 a-f are guide fins, 25 is a blower, and 26 is a cover. Reaction chamber 23, guide fin 24
A semiconductor layer is provided on the guide fins 211, and the gas containing bad odor that is forcibly sent in from the air blower 25 is transferred to the guide fins 211.
As shown by the arrow {circle around (2)} in FIG. 13, the gas is gently bent inside the reaction chamber 23 while diagonally crossing the electric light 22, and is discharged from the outlet.

Problems to be Solved by the Invention In the conventional example described above, the guide fins 24 are used to bring the bad odor into contact with the f-conductor layer as efficiently as possible.
UV rays are blocked, and it can appear in areas with weak light or shadows.
On the contrary, the reaction did not proceed efficiently and produced smelly intermediate products.

The present invention solves the above-mentioned conventional drawbacks, and aims to provide a deodorizing device that effectively decomposes bad odors through photocatalytic action.

Means for Solving the Problems As a means for achieving the above object, the photocatalytic deodorizing device of the present invention comprises an electric lamp that emits ultraviolet rays and a cylinder that faces the electric lamp and rotates around the electric lamp. It consists of a semiconductor catalyst layer and a blower that blows odor-containing air into the catalyst layer. Further, by providing a radial fixing plate around the electric lamp inside the rotating catalyst layer, a deodorizing device with even better deodorizing performance is provided. On the other hand, a blade is integrally provided at the end of the cylinder on which the catalyst layer is formed, and the cylinder rotates around an electric light, and the blade sends odor-laden air to the catalyst layer, thereby achieving more compact deodorization. It provides a filter 1.

As another means, there is provided a photocatalytic deodorizing device comprising an electric lamp that irradiates ultraviolet rays, a corrugated semiconductor catalyst layer facing the electric lamp, and a blower that blows odor-containing air into the catalyst layer. Further, the corrugated semiconductor catalyst layer is formed inside the cylinder, and by rotating around an electric lamp that irradiates ultraviolet rays, a radial fixed plate is formed inside the rotating catalyst layer around the electric light. By providing this, a deodorizing device with superior deodorizing performance is provided. On the other hand, a blade is integrally provided at the end of the cylinder on which the catalyst layer is formed, and the cylinder rotates around an electric light, and the blade sends odor-laden air to the catalyst layer, thereby achieving more compact deodorization. It provides equipment.

Still another method includes an electric lamp that irradiates ultraviolet rays, a semiconductor catalyst layer formed inside a cylinder around the electric lamp, and a blower that blows odor-containing air into the catalyst layer from a tangential direction of the cylinder. The present invention provides a deodorizing device using a photocatalyst. Further, the semiconductor catalyst layer formed inside the cylinder is rotated around the electric light in the opposite direction to the flow of odor-laden air sent by the blower, and the semiconductor catalyst layer is rotated by rotating the semiconductor layer catalyst into a corrugated plate. This provides a deodorizing device with even better deodorizing performance.

It is known that when an active semiconductor material, an oxidizable compound (arsenic compound), and a gas containing oxygen coexist, when the semiconductor material is irradiated with ultraviolet rays, the oxidizable compound is oxidized and decomposed. The working principle of this photocatalysis is that electrons in the valence band in a semiconductor absorb ultraviolet light and are excited to the conduction band, and the holes in the valence band generated there are located on the surface of the catalyst. Reacts with hydroxyl group (OH group),
It is assumed that the electrons excited in the conduction band react with oxygen (0) to generate highly active OH radicals, O radicals, and O'-2, which oxidize and decompose the oxidizable compound.

When applying this photocatalytic effect to a deodorizing device, it is important that the ultraviolet rays emitted from electric lights are used efficiently.
Furthermore, the bad odor comes into sufficient contact with the semiconductor catalyst layer. Regarding the former, it is necessary to consider semiconductor materials. Here, we conducted various studies regarding the latter.

As a result, a semiconductor catalyst layer was formed inside a cylinder, an electric light that irradiated ultraviolet rays was installed in the center of the cylinder, and a bad odor was sent into the cylinder.By rotating the cylindrical catalyst layer, the surface of the catalyst layer was removed. As the barrier film becomes thinner and the diffusion of bad odors into the catalyst layer improves, oxidative decomposition by photocatalysis can occur efficiently without blocking ultraviolet rays. Furthermore, if fixing plates are provided radially around the lamp, turbulent flow will occur and the film will become even thinner.

As another method, by making the catalyst layer into a corrugated plate shape, the area of the catalyst can be increased, and turbulent flow is generated on the surface of the catalyst, so that the diffusion of bad odors into the catalyst layer is promoted efficiently. Furthermore, by rotating the catalyst layer and further providing fixed plates radially around the lamp, the diffusion of bad odor into the catalyst layer is improved.

Yet another method is to introduce odor-containing air from the tangential direction of a cylinder with a catalyst layer formed inside, so that the air swirls along the catalyst layer, resulting in better contact between the odor and the catalyst layer. In addition, by rotating the catalyst layer in the opposite direction to the swirling direction of the air and making the catalyst layer into a corrugated plate shape, the contact between the -layer air and the catalyst layer is improved, and the diffusion of bad odors into the catalyst layer is improved. gets better.

In the first two methods, blades are integrally provided at the end of the rotating cylinder to function as a blower.

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

Examples 1 and 2 FIGS. 1 and 2 show a first example of a deodorizing device using a photocatalyst of the present invention. FIG. 1 is a longitudinal cross-sectional view, and FIG. 2 is a cross-sectional view. 1 is a lamp that emits ultraviolet rays, 2 is a socket for the lamp 1, 3 is a cylinder set around the lamp 1,
4 is a semiconductor catalyst layer formed on the inner surface of the cylinder 3, 5 is a sirocco fan, 6 is a motor, and 7 is a chi 1 to 1 for introducing air sent by the sirocco fan 5 into the inside of the circle @3.
．． 8 is an air inlet; 1 and 9 are air outlets; 10 is a drive motor for rotating the cylinder 3; 11 is a drive motor] (drive rollers attached to two shafts; 12 is a drive roller 11); A transmission roller that transmits rotation to the cylinder 3, 13 is the cylinder 3
This is a support roller that supports the

The electric light 1 may be one that emits ultraviolet rays, and the ultraviolet rays may be far ultraviolet rays or near ultraviolet rays.

Such electric lights include low-pressure mercury lamps, high-pressure mercury lamps, and ultra-high-pressure mercury lamps.
Germicidal lamp of 5 watts 1 ~ (ultraviolet rays output approximately 3.2 watts,
A wavelength of 25B, 7 nm) was used.

The inner diameter of the cylinder 3 is 150 mm, and the semiconductor catalyst layer 4 is made of titanium oxide and tungsten oxide, or a mixed acid (arsenic acid (total 300 g/m2) in a weight ratio of 80:20) supported on ceramic paper with a thickness of 0.5 nm. The drive motor was adjusted so that the air volume of the sirocco fan was about 3 m3/min, and the rotation speed of the cylinder 3 was about 1.000 rpm.

In the above configuration, when the lamp 1 is turned on while rotating the cylinder 3, the semiconductor catalyst layer 4 is excited. When air containing odor is sent into the cylinder 3 through the kite 7 by the sirocco fan 5, a turbulent flow is generated near the semiconductor catalyst layer i1, the odor is diffused into the semiconductor catalyst layer 4, and the surface becomes acidic. It is decomposed by 1. Namely, odor-causing substances such as ammonia, nitrogen compounds of amines, hydrogen sulfide, sulfur compounds of mercaptans, Artehyde 1~, Ken I and N,
Alcohols, fatty acids and aromatic compounds are carbon dioxide,
---1,1- It is oxidized and decomposed into water, nitrogen oxides, sulfur oxides, etc. The deodorized air then comes out from the outlet 9.

FIG. 3 is a cross-sectional view of the second embodiment. Here, the first
Inside the cylinder 3 of the deodorizing device of Example 1, four fixed plates 14 radially extending from the electric lamp 1 were provided, each having the same length as the electric lamp. In this case, the air sent by the sirocco fan 5 becomes more turbulent as shown in FIG. 4 will be more easily spread. In addition, since the fixing plate 14 is provided radially around the electric light 1,
It has almost no effect on UV irradiation.

Next, the deodorizing devices of the first and second embodiments are placed in an aluminum box having an internal volume of 1 m3. Acetaldehyde is then injected into this box and adjusted to an initial concentration of approximately 8.5 ppm. Next, the electric light 1 is turned on, the fan motor 6 is turned on to move the sirocco fan 5, the drive motor 10 is turned on to rotate the cylinder 3, and the deodorizing device is started. Measure the change in the concentration of acetaldehyde in the box. Concentration measurements were performed by gas chromatography. The results are shown in FIG.

A is the case where the cylinder 3 is not rotated in the first embodiment, B is the case where the cylinder 3 is rotated in the first embodiment, and C is the case where there is a fixed plate]4 in the second embodiment. From this figure, the effect of rotating the cylinder 3 and the effect of the fixing plate 14 are clear.

Examples 34 and 5 The third example will be explained with reference to FIG. In the case of the third embodiment, the cylinder 3a is not rotated, and the conductor catalyst layer 4a inside thereof is shaped like a corrugated plate. The shape of this wave is 2 m
Waves with a height of m are formed at a pitch of 4 mm.

The area of this semiconductor catalyst layer 4a is about 1.4 times that of a case where the semiconductor catalyst layer 4a does not have a corrugated plate shape.

The waves are formed perpendicularly to the circumferential direction of the cylinder 3a, that is, to the flow of odor-laden air sent by the sirocco fan 5, or the semiconductor catalyst Jrfi4. a
This is desirable because turbulence is likely to occur near the surface 1.

A cross-sectional view of the fourth embodiment is shown in FIG. This embodiment has the same structure as the first embodiment, and has a semiconductor catalyst layer 4.
b has the same corrugated plate shape as in the third embodiment.

Since the cylinder 3 to which the semiconductor catalyst layer 4b is attached is rotated, it is preferable to form the waves parallel to the axis of the cylinder 3 because turbulence is more likely to occur near the surface of the semiconductor catalyst layer 4b. The fifth embodiment is a deodorizing device having the same structure as the fourth embodiment and further provided with the same fixing plate as the second embodiment. In this case, the air sent and drawn in by the sirocco fan becomes highly turbulent due to the rotation of the cylinder and the fixed plate, and the odor is more easily diffused into the semiconductor catalyst layer than in the fourth embodiment.

Further, other conditions in Examples 3.4 and 5 are the same as in the first example. That is, the electric light] is a sterilizing lamp of 15 watts, the inner diameter of the cylinder 3.3a is 150 mm, and the cylinder 3.
The rotational speed of the sirocco fan 5 is approximately 11,000 rpm, and the air volume of the sirocco fan 5 is approximately 3 m3/min. The semiconductor catalyst layers 4a and 4b are made of titanium oxide and tungsten oxide in a weight ratio of 80. :20
mixed oxide (total 300g/m') to a thickness of 0.5m
It was supported on a ceramic paper of m.

Next, the deodorizing devices of Examples 3.4 and 5 are placed in an aluminum box having an internal volume of 1 m3. Then, inject acetaldehyde into this box and adjust the initial concentration to about 85 ppm. Subsequently, the change in acetaldehyde concentration over time was measured in the same manner as in Example 1.2. The results are shown in FIG.

A is the case in which the cylinder 3 is not rotated in the first embodiment, that is, in the case of a flat catalyst layer, D is in the case of a non-rotating corrugated catalyst layer in the third embodiment, and E is the case in the fourth embodiment. In the fifth embodiment, the corrugated catalyst layer rotates, and F is the fifth embodiment, in which a fixed plate is further provided. From this figure, the effects of the corrugated catalyst layer, the effect of rotating the cylinder, and the effect of the fixed plate are clear.

Examples 6, 7, 8 and 9 A sixth example will be explained with reference to FIG. In the case of the sixth embodiment, the cylinder 3b is not rotated, and the semiconductor catalyst layer 4 is flat. Here, the sirocco fan 5a is the cylinder 3b
Attach it so that it blows out in a tangential direction to the circumference of the area. As a result, the odor-laden air flows along the surface of the semiconductor catalyst layer in a swirling manner.

A cross-sectional view of the seventh embodiment is shown in FIG. In this embodiment, the sirocco fan of the first embodiment is installed so that the blowing direction is tangential to the circumference of the cylinder 3, as in the sixth embodiment. Then, as shown in FIG. 9, the cylinder 3 is rotated in the direction of {circle around (2)}, which is opposite to the air flow I, so that the film on the surface of the semiconductor catalyst layer 4 becomes thinner.

In the eighth embodiment, the semiconductor catalyst layer in the sixth embodiment is made into a corrugated plate shape with a height of 2 mm and a pitch of 4 mm, which is the same as in the third embodiment. In addition, here the direction of the wave is
There is no big difference whether it is parallel or perpendicular to the axis of the cylinder. This increases the area of the catalyst and causes more turbulence on the catalyst surface, resulting in a thinner film.

The ninth embodiment is the same as the seventh embodiment, except that the semiconductor catalyst layer is shaped like a corrugated plate as in the third embodiment. In addition,
Here, the direction of the waves does not make much difference whether they are parallel or perpendicular to the axis of the cylinder. This increases the area of the catalyst and causes more turbulence on the catalyst surface, resulting in a thinner film.

Further, other conditions in Examples 6, 7, 8, and 9 are the same as in the first example. That is, the electric light 1 is a 15 watt germicidal lamp, the inner diameter of the cylinder is 150 mrn,
The rotational speed of the cylinder was about 1100 Orp, the air volume of the sirocco fan was about 3 m3/min, and the semiconductor catalyst layer was made by supporting a mixed metal oxide of titanium oxide and tungsten oxide on ceramic paper.

Next, the deodorizing devices of Examples 6, 7, 8 and 9 are placed in a 1 m 3 box made of aluminum, and acetaldehyde is injected to adjust the initial concentration to about 8.5 ppm. Subsequently, the change in acetaldehyde concentration over time was measured in the same manner as in case 1.2. The results are shown in Figure 10.1.
A is the case in which the cylinder, that is, the catalyst layer, is not rotated in the first embodiment, and G is the case where the catalyst layer in the sixth embodiment is not rotated and the odor is directed tangent to the circumference of the cylinder with the catalyst layer attached. When blowing from the direction, H is the seventh embodiment, when the catalyst layer of G is rotated, ■ is the eighth embodiment, and when the catalyst layer of G is corrugated, J is the ninth embodiment. In the example, the catalyst layer (2) is rotated. This figure clearly shows the effect of blowing odor tangentially to the circumference of the cylinder with the catalyst layer attached, the effect of rotating the cylinder, and the effect of the wave root-shaped catalyst.

Example 10 A tenth example will be explained with reference to FIG. Here, a blade 15 is integrally provided at the end of the rotating cylinder 3c. By rotating this blade 15, from the inlet 8a to the outlet 9
This guides air containing odor in the direction a. As a result, there is no need to provide additional air, and the deodorizing device can be made compact. Note that the semiconductor catalyst layer 4c may have a flat plate shape or a corrugated plate shape.

The other conditions in the tenth embodiment are that the electric lamp 1 is 6
Watsul germicidal lamp (ultraviolet output approximately 1 W), the inner diameter of the cylinder was 80 mm, the rotation speed of the cylinder was approximately 10 QQ rpm, and the semiconductor catalyst layer was a mixed metal oxide of titanium oxide and tungsten oxide supported on ceramic paper. It is something.

Effects of the Invention As is clear from the above-mentioned examples, the photocatalytic deodorizing device of the present invention can efficiently advance the photocatalytic reaction for a long time without blocking ultraviolet rays or creating resistance to wind flow. I can do it.

In addition, by installing blades integrally at the end of a rotating cylinder with a catalyst layer formed inside, it also functions as a blower.
This makes it possible to obtain a highly efficient deodorizing device suitable for narrow spaces such as refrigerators.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the photocatalytic deodorizing device of the first invention, and FIG. 2 is a cross-sectional view of A. FIG. 3 is a cross-sectional view of another embodiment. FIG. 4 is a graph showing the acetaldehyde decomposition characteristics of the photocatalytic deodorizing device of the first invention. FIG. 5 is a longitudinal sectional view of an embodiment of the deodorizing device of the second invention;
FIG. 6 is a cross-sectional view of another example, and FIG. 7 is a graph showing the acetaldehyde decomposition characteristics of the deodorizing device of the second invention. FIG. 8 is a longitudinal sectional view of an embodiment of the deodorizing device of the third invention;
FIG. 9 is a cross-sectional view of another example, and FIG. 10 is a graph showing the acetaldehyde decomposition characteristics of the deodorizing device of the third invention. FIG. 11 is a longitudinal sectional view of still another embodiment of the deodorizing device of the first invention. FIG. 12 is a perspective view of a conventional deodorizing device, FIG. 13 is a cutaway plan view of a main part of the deodorizing device, and FIG. 14 is a perspective view of a main part of a reaction chamber of the deodorizing device. 1: Electric light 3.3a, 3b, 3c: Cylinder 4.4a, 4b
, 4c: Semiconductor catalyst layer 5.5a Toso dyeing) Toso 1 square color

Claims (10)

[Claims] (1) A light that emits ultraviolet light and a light that faces this light,
A photocatalytic deodorizing device consisting of a semiconductor catalyst layer formed inside a cylinder that rotates around an electric light, and a blower that blows odor-laden air into the catalyst layer. (2) A deodorizing device using a photocatalyst according to claim 1, wherein a radial fixing plate is provided inside the rotating catalyst layer around the electric light. (3) A blade is integrally provided at the end of the cylinder on which the catalyst layer is formed, and the cylinder rotates around an electric light, and the blade sends odor-laden air to the catalyst layer. A deodorizing device using a photocatalyst according to Items 1 and 2. (4) A photocatalytic deodorizing device comprising an electric lamp that irradiates ultraviolet rays, a corrugated semiconductor catalyst layer facing the electric lamp, and a blower that blows odor-laden air into the catalyst layer. (5) A corrugated semiconductor catalyst layer is formed inside the cylinder,
A deodorizing device using a photocatalyst according to claim 4, which rotates around an electric lamp that irradiates ultraviolet rays. (6) A deodorizing device using a photocatalyst according to claim 5, wherein a radial fixing plate is provided inside the rotating catalyst layer with the electric lamp at the center. (7) A blade is integrally provided at the end of the cylinder on which the catalyst layer is formed, and the cylinder rotates around an electric light, and the blade sends odor-laden air into the catalyst layer. 6. A deodorizing device using a photocatalyst according to item 6. (8) A photocatalyst consisting of an electric lamp that irradiates ultraviolet rays, a semiconductor catalyst layer formed inside a cylinder around the electric lamp, and a blower that blows odor-laden air into the catalyst layer from the tangential direction of the cylinder. Deodorizing equipment. (9) The photocatalyst according to claim 8, wherein the semiconductor catalyst layer formed inside the cylinder rotates around the electric light in a direction opposite to the flow of odor-laden air sent by a blower. Deodorizing equipment. (10) A deodorizing device using a photocatalyst according to claim 8 or 9, wherein the semiconductor layer catalyst has a corrugated plate shape.