JPH0691137A - Deodorizer - Google Patents

Abstract

PURPOSE:To provide a deodorizing device which enables high-efficiency and high-performance deodorization by combining optically exciting catalyst, hydrocarbon catalyst, ozone, and UV rays. CONSTITUTION:This device has a upstream-side honeycomb structure 2A and downstream-side honeycomb structure 2C in an upstream side and a downstreamb side, respectively, of the passage 1 through which the gas G passes so that the gas to be treated is brought into contact with optically exciting catalyst in these honeycomb structures. A middle honeycomb structure is disposed between these honeycomb structures so that the gas to be treated is brought into contact with a hydrocarbon decomposition catalyst. Further, UV lamps 4 for producing ozone are disposed in the upstream side of the honeycomb structure 2A and UV lamps 5 for decomposing ozone and disposed in the downstream side of the honeycomb structure 2C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing apparatus which combines a photoexcited catalyst and a hydrocarbon catalyst and further uses ultraviolet rays and ozone together for deodorization and sterilization.

[0002]

_2. Description of the Related Art A deodorizing device for irradiating a filter containing a photoexcited catalyst such as TiO _{2 with} ultraviolet rays to deodorize by utilizing the redox power of the excited photoexcited catalyst is known, and an ozone generating ultraviolet lamp is photoexcited. Devices which combine with catalysts are likewise known. Further, a device is also known in which ozone is generated by an ozone generating ultraviolet lamp and deodorized by the oxidizing power of oxygen (O) in the nascent period generated by ozone decomposition by an ozone decomposing ultraviolet lamp.

[0003]

In the former deodorizing device, which uses a combination of ultraviolet rays and a photoexcited catalyst, the photoexcited catalyst deteriorates due to the adhesion of organic matter such as oil smoke, cigarette tar, etc., so that the oxidizing power gradually decreases. It becomes weaker, cannot deodorize to a high degree, and has a problem of short life.

On the other hand, the latter deodorizing device, which is a combination of ozone-generating ultraviolet rays and ozone-decomposing ultraviolet rays, has poor energy efficiency because the ozone-decomposing ultraviolet rays are consumed only for decomposing ozone. Further, nascent oxygen (O) generated from ozone decomposed by ultraviolet rays is used for decomposing odors, and at the same time, oxygen (O) during the nascent period is consumed as oxygen O ₂ due to mutual reaction. As a result, there is a problem that the effective deodorization efficiency of ozone O ₃ is low and it is necessary to supply an excessive amount of O ₃ , so that the ultraviolet lamp has a large structure and the running cost rises.

An object of the present invention is to provide a deodorizing device capable of improving the utilization efficiency of ultraviolet energy for ozone generation and ozone decomposition, enhancing the deodorizing efficiency of ozone, and preventing the fouling of the catalyst to enhance the deodorizing power. It is to be.

[0006]

According to the present invention, a honeycomb structure 2 having a large number of parallel small hole passages 3 penetrating between front and rear end faces is provided with a flow of a gas to be treated G containing a harmful / odorous gas component. A device for deodorizing the gas to be treated G, which is provided in the passage 1, and circulates the gas to be treated G in the small hole passage 3, wherein the wall surface of the small hole passage 3 is a photoexcited catalyst-containing layer from the upstream side of the flow passage 1. Which is the upstream honeycomb structure 2A, which is also the hydrocarbon decomposition catalyst containing layer, which is the middle flow side honeycomb structure 2B, and which is also the photoexcitation catalyst containing layer which is the downstream honeycomb structure 2C.
Are sequentially provided, an ozone generating ultraviolet lamp 4 that emits ultraviolet rays that generate ozone is provided on the upstream side of the upstream side honeycomb structure 2A, and ozone is decomposed on the downstream side of the downstream side honeycomb structure 2C. The deodorizing device is characterized in that an ozone decomposing ultraviolet lamp 5 that emits ultraviolet rays is provided.

Further, according to the present invention, a honeycomb structure 2 having a large number of parallel small hole passages 3 penetrating between the front and rear end faces is provided in the flow passage 1 for the gas to be treated G containing a harmful / odorous gas component. A device for performing deodorization by circulating the gas to be treated G through the small hole passages 3, wherein the wall surface of the small hole passages 3 in the honeycomb structure 2 is the upstream end face portion and the downstream end face portion. The intermediate portion formed by the photoexcitation containing layer and sandwiched between them is formed by the hydrocarbon decomposition catalyst containing layer, and the ozone generating ultraviolet lamp 4 for radiating ultraviolet rays for generating ozone is provided on the upstream side of the honeycomb structure 2. Is provided, and on the downstream side of the honeycomb structure 2,
The deodorizing device is characterized in that it is provided with an ozone decomposing ultraviolet lamp 5 that emits ultraviolet rays that decompose ozone.

Further, the present invention is the deodorizing device characterized in that the hydrocarbon decomposition catalyst-containing layer in the honeycomb structure is a layer in which hydrophobic zeolite is supported on the honeycomb structure base material.

The present invention also provides a flow passage 1 for the gas to be treated G.
Inside, there are a number of parallel small hole passages 3 penetrating the front and rear end faces on the upstream side of the ozone generating ultraviolet lamp 4, and the wall surface of the small hole passages 3 is the most upstream side formed by the photoexcited catalyst-containing layer. The deodorizing device is characterized by being provided with a honeycomb structure 2D.

Further, according to the present invention, the flow passage 1 for the gas to be treated G is provided.
Inside, a large number of parallel small hole passages 3 penetrating between the front and rear end faces are provided on the downstream side of the ozone decomposing ultraviolet lamp 5.
The deodorizing device is characterized in that the wall surface of the small hole passage 3 is provided with the most downstream honeycomb structure 2E formed of an ozone decomposition catalyst containing layer.

[0011]

According to the present invention, the photoexcited catalyst-containing layer is provided for the gas to be treated G on the upstream side and the downstream side with the honeycomb structure having the hydrocarbon decomposition catalyst-containing layer on the wall surface in contact with the gas to be treated G interposed therebetween. A honeycomb structure having a contact wall surface is provided. Further, an ozone generating ultraviolet lamp is provided on the upstream side of the upstream honeycomb structure, and an ozone decomposing ultraviolet lamp is provided on the downstream side of the downstream honeycomb structure.

Therefore, the ozone generating ultraviolet lamp generates ozone and simultaneously irradiates the photoexcited catalyst with an oxidizing power. Further, the ozone decomposition ultraviolet lamp decomposes ozone by the generated ultraviolet light and at the same time imparts an oxidizing power to the photoexcited catalyst. As a result, the harmful and malodorous gas components are oxidatively decomposed and deodorized by the oxidizing power of ozone and the photoexcited catalyst. Moreover, the gas G to be treated is sterilized by this oxidizing action. As a result, the deodorizing efficiency is improved.

Further, the generated ozone decomposes the deteriorated substances adhering to the photoexcited catalyst to activate the catalyst.

Further, according to the present invention, a hydrocarbon decomposition catalyst containing layer is provided between the photoexcitation catalyst containing layers. This hydrocarbon decomposition catalyst-containing layer contains harmful gases contained in the gas to be treated G /
Adsorbs malodorous components and ozone at the same time. For this,
Ozone and harmful / bad odor components are different from the diffused state in the air, mutual contact is improved, the odorous substances are decomposed efficiently, and nascent oxygen changing from ozone reacts with each other and is used for deodorization. Compared with a general deodorizing device in which the proportion of the depletion decreases, the mutual reaction of oxygen during the nascent stage is less, and the effective deodorizing power of ozone is enhanced.

According to the invention, a hydrophobic zeolite layer is used as the hydrocarbon catalyst containing layer. Hydrophobic zeolite is an excellent adsorbent for polar odors such as ammonia, amine, and mercaptan. It is also non-flammable and difficult to adsorb moisture. Therefore, contact between ozone and harmful / malodorous components is improved. The malodorous substance is decomposed efficiently.

According to the present invention, the most downstream honeycomb structure having the ozone decomposition catalyst containing layer on the contact wall surface is provided on the downstream side of the ozone decomposition ultraviolet lamp. Therefore, the excess ozone is decomposed by the ozone decomposing ultraviolet lamp, and the surplus energy of the lamp is converted into the oxidizing / reducing power of the photoexcited catalyst, so that ozone odor does not remain and highly efficient deodorization is possible. .

In the present invention, since the honeycomb structure is used as the catalyst layer of the deodorizing device, the ultraviolet light receiving area can be wide and the contact rate with the gas to be treated is high.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic structural view of a deodorizing device according to a first embodiment of the present invention, and FIG. 2 is a perspective view of the same. The deodorizing apparatus of this embodiment is used in, for example, a food processing factory, a hospital, etc., and is an apparatus for deodorizing a gas to be treated G containing harmful / bad odorous gases such as amines, mercaptans, sulfides, and hydrocarbons. . In the deodorizing device, the pre-filter 6, and three honeycomb structures 2A, 2B and 2C are arranged from the upstream side in the flow passage 1 through which the gas to be treated G flows. Upstream, midstream, and downstream honeycomb structures 2A, 2B, 2
Regarding C, the basic structure is the same. For example, a catalyst having a catalytic action required for a material having water resistance and water vapor resistance such as ceramic paper (SiO ₂ —Al ₂ O ₃ ) is used as an aqueous dispersion method. By adhering by impregnation and heating and drying, the short columnar main body is formed into a honeycomb shape having a large number of parallel small hole passages 3 penetrating between the front and rear end faces.

In the upstream side honeycomb structure 2A and the downstream side honeycomb structure 2C, the wall surface of the small hole passage 3 is mainly composed of the photoexcited catalyst, and the photoexcited catalyst is effective against the air flow flowing in the small hole passage 3. Can be contacted. On the other hand, in the middle-flow side honeycomb structure 2B, the wall surface of the small hole passage 3 has a hydrocarbon decomposition catalyst as a main component, and the hydrocarbon decomposition catalyst may effectively contact the air flow flowing in the small hole passage 3. it can. Each of these honeycomb structures 2A, 2B, 2C
Are disposed in the flow passage 1 in close proximity to each other so that the gas to be treated G flows in each small hole passage 3.

The photoexcited catalyst is a catalyst for mediating conversion of light energy into chemical energy, and a semiconductor such as titanium oxide has this function. When a semiconductor is irradiated with light, the electrons in the valence band move to the conduction band, and the valence band has an oxidizing power and the conductor has a reducing power. Since the harmful and malodorous gases are decomposed and deodorized by utilizing this oxidizing and reducing power,
The gas G to be treated can be deodorized and sterilized.

Although the surface of the photoexcited catalyst is deteriorated by the organic matter, it is possible to activate the photoexcited catalyst and prolong the life of the photoexcited catalyst by oxidatively decomposing the organic matter by bringing it into contact with, for example, ozone O _3. is there.

On the other hand, the hydrocarbon decomposition catalyst is for efficiently contacting a malodorous substance of a harmful / malodorous gas component for deodorization, and for example, a hydrophobic zeolite is used. This hydrophobic zeolite is a crystal of aluminosilicate metal salt chemically, and the oxygen atom in its silica structure has almost no basicity and does not participate in the formation of hydrogen bonds. The -Si bond exhibits water repellency, and has a characteristic that the amount of adsorbed water can be reduced.

An ozone generating ultraviolet lamp 4 and an ozone decomposing ultraviolet lamp 5 are further provided in the flow passage 1 in which the three honeycomb structure bands 2A, 2B and 2C are interposed. The ozone-generating ultraviolet lamps 4 are disposed at a position upstream of the upstream honeycomb structure 2A with an appropriate interval therebetween and are arranged in a distributed manner to emit ultraviolet light having a wavelength of less than 200 nm, for example, 184.9 nm. It is provided so as to be able to uniformly radiate mainly to the front end face portion of the upstream side honeycomb structure 2A. The ozone-decomposing ultraviolet lamps 5 are arranged at a proper distance from the downstream honeycomb structure 2C and dispersed at several positions on the downstream side.
It is provided so that ultraviolet rays of nm or more, for example, 253.7 nm can be uniformly emitted mainly to the rear end face portion of the downstream side honeycomb structure 2C.

FIG. 5 is a diagram showing the relationship between the wavelength of ultraviolet rays and the relative value of ozone decomposition effect and the relative value of ozone generation effect.
The ozone decomposing effect is shown by the solid curve L1 but is 253.7.
The emission characteristic with a peak wavelength of nm is clearly defined, while
The ozone generation effect is shown by the broken line L2,
The characteristics with a peak of 5 nm are clearly shown.

Next, the mode of the deodorizing operation of this embodiment will be described. After the ozone generating ultraviolet lamp 4 and the ozone decomposing ultraviolet lamp 5 are energized to emit light, the gas G to be treated containing the harmful / malodorous gas component is circulated in the flow passage 1. Ozone generated from the ozone generating ultraviolet lamp 4 flows into the upstream honeycomb structure 2A together with the gas to be treated G and imparts an oxidizing power to the photoexcited catalyst, so that deodorization having a large deodorizing effect is performed in the upstream honeycomb structure 2A. Be seen. That is, ozone decomposes the deteriorated substance on the photoexcited catalyst and activates the catalyst, and a long-term stable deodorizing action is exhibited in the upstream honeycomb structure 2A.

The rest of the generated ozone flows into the intermediate flow side honeycomb structure 2B and the downstream side honeycomb structure 2C. In the middle-stream side honeycomb structure 2B, unlike the diffusion state of ozone and malodorous substances in the air, harmful / malodorous gas and ozone are adsorbed by the hydrophobic zeolite, and harmful / malodorous gas and ozone are fixed here. Since it is in contact with each other, it decomposes odorous substances efficiently. The decomposed malodorous substance is adsorbed by the midstream honeycomb structure 2B. The ozone and the gas to be treated G that have passed through the middle-stream side honeycomb structure 2B flow into the downstream-side honeycomb structure 2C, and efficient deodorization is performed in the downstream-side honeycomb structure 2C activated by contact with ozone.

When passing through the downstream honeycomb structure 2C, the gas to be treated has been deodorized and sterilized to be purified air, but contains residual ozone. The residual ozone is decomposed in contact with the ultraviolet rays emitted from the ozone decomposing ultraviolet lamp 5, and is discharged from the flow passage 1 as clean air having no ozone odor. On the other hand, the ultraviolet rays emitted from the ozone-decomposing ultraviolet lamp 5 not only decompose ozone, but also surplus ultraviolet energy is converted into the redox power of the photoexcited catalyst in the downstream side honeycomb structure 2C.

FIG. 3 is a schematic structural view of a deodorizing device according to the second embodiment of the present invention. The illustrated device is similar to the device of the first embodiment, and corresponding parts are designated by the same reference numerals. What should be noted in the device of the second embodiment is that one honeycomb structure 2 has the same function as that of the three honeycomb structures 2A, 2B and 2C. That is, the honeycomb structure 2 has a large number of parallel small hole passages 3 penetrating between the front and rear end faces, and the wall surface of each small hole passage 3 has an upstream end face portion A and a downstream end face portion C. Is formed of a photoexcited catalyst such as TiO ₂ as a main component,
The intermediate portion B sandwiched between them is formed mainly with a hydrocarbon decomposition catalyst, for example, hydrophobic zeolite. This honeycomb structure 2 has the same shape, and the wall surface of the small hole passage 3 is TiO ₂ ,
It can also be manufactured by joining a different material from the hydrophobic zeolite or by adhering the hydrophobic zeolite by dipping and then performing a two-step treatment in which TiO ₂ is adhered to both end faces.

Since the deodorizing action of the apparatus of this embodiment is the same as that of the apparatus of the first embodiment, its explanation is omitted.

FIG. 4 is a schematic structural diagram of a deodorizing apparatus which is a third embodiment of the present invention. The illustrated device is similar to the device of the first embodiment, and corresponding parts are designated by the same reference numerals. What should be noted in the device of the third embodiment is that the most upstream side honeycomb structure 2D and the most downstream side honeycomb structure 2E are additionally provided in the flow passage 1. The basic structures of these two structures 2D and 2E are the same as those of the structures 2A, 2B and 2C,
The most upstream honeycomb structure 2D is provided upstream of the ozone generating ultraviolet lamp 4, and the most downstream honeycomb structure 2E is provided upstream of the ozone decomposing ultraviolet lamp 5.

In the most upstream side honeycomb structure 2D, the wall surface of each small hole passage 3 is formed of a photoexcitation catalyst, for example, a layer containing TiO ₂ as a main component. On the other hand, in the most downstream honeycomb structure 2E, the wall surface of each small hole passage 3 is formed of a layer containing an ozone decomposition catalyst such as MnO ₂ as a main component.

By providing the most upstream side honeycomb structure 2D, the ozone generating ultraviolet lamp 4 has a structure sandwiched by the photoexcited catalyst containing layers, and the photoexcited catalyst containing layer is formed so that the ultraviolet rays emitted by the ozone generating ultraviolet lamp 4 do not leak. It is possible to effectively utilize the ozone that is generated by radiating the entire amount.

On the other hand, by providing the most downstream side honeycomb structure 2E, residual ozone is removed from this honeycomb structure 2E.
It is possible to completely decompose with, and it is possible to eliminate the unpleasant residual smell of ozone.

[0034]

As described above, according to the present invention, the deodorizing effect is synergistically enhanced by using the photoexcited catalyst of the upstream side honeycomb structure and the downstream side honeycomb structure together with ozone from the ozone generating lamp. . Further, the ozone generating lamp has high utilization efficiency because the ozone generating lamp has an original function of generating ozone, and excess energy is converted into a photoexcited catalyst as a redox power.

Further, since a hydrocarbon decomposition catalyst is provided between the photoexcited catalysts for deodorization, the efficiency of effective decomposition with ozone is increased and the deodorization is performed more effectively, unlike in air.

Further, according to the present invention, by providing the ozone decomposing ultraviolet lamp on the downstream side, it is possible to surely decompose the residual ozone, to prevent the ozone offensive odor, and to provide a highly reliable deodorizing device. You can

Further, according to the present invention, since the honeycomb structure is used in the deodorizing device, it is possible to provide a deodorizing device having a large area in contact with the gas to be treated G, a compact structure and high efficiency.

[Brief description of drawings]

FIG. 1 is a schematic structural diagram of a deodorizing device that is a first embodiment of the present invention.

FIG. 2 is a perspective view of the deodorizing device shown in FIG.

FIG. 3 is a schematic structural diagram of a deodorizing device that is a second embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a deodorizing device that is a third embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between a wavelength of ultraviolet rays and a relative value of an ozone generation effect and an ozone decomposition effect relative value.

[Explanation of symbols]

 1 Flow Path 2 Honeycomb Structure 2A Upstream Honeycomb Structure 2B Middle Flow Side Honeycomb Structure 2C Downstream Honeycomb Structure 3 Small Hole Passage 4 Ozone Generating Ultraviolet Lamp 5 Ozone Decomposing Ultraviolet Lamp

Claims (5)

[Claims] 1. A honeycomb structure 2 having a large number of parallel small hole passages 3 penetrating between front and rear end faces is provided in a flow passage 1 of a gas to be treated G containing a harmful / malodorous gas component, A device for performing deodorization by causing a gas G to flow through the small hole passage 3, wherein an upstream side honeycomb structure 2A in which the wall surface of the small hole passage 3 is a photoexcitation catalyst-containing layer from the upstream side of the flow passage 1 , A middle-flow side honeycomb structure 2 which is also a hydrocarbon decomposition catalyst containing layer
B, the downstream side honeycomb structure 2C, which is also a layer containing a photoexcited catalyst, is sequentially provided, and the ozone generating ultraviolet lamp 4 that emits ultraviolet rays for generating ozone is provided on the upstream side of the upstream side honeycomb structure 2A. A deodorizing device characterized in that an ozone decomposing ultraviolet lamp 5 for emitting ultraviolet rays for decomposing ozone is provided on the downstream side of the side honeycomb structure 2C. 2. A honeycomb structure 2 having a large number of parallel small hole passages 3 penetrating between the front and rear end faces is provided in a flow passage 1 of a gas to be treated G containing a harmful / odorous gas component and is treated. A device for performing deodorization by causing gas G to flow through the small hole passages 3, wherein the wall surface of the small hole passages 3 in the honeycomb structure 2 has a photoexcitation containing layer in which the upstream end face portion and the downstream end face portion are And a middle portion sandwiched between them is formed by a hydrocarbon decomposition catalyst containing layer, and an ozone generating ultraviolet lamp 4 for emitting ultraviolet rays for generating ozone is provided on the upstream side of the honeycomb structure 2. A deodorizing device characterized in that an ozone decomposing ultraviolet lamp 5 for emitting ultraviolet rays for decomposing ozone is provided on the downstream side of the honeycomb structure 2. 3. The hydrocarbon decomposition catalyst-containing layer in the honeycomb structure is a layer in which a hydrophobic zeolite is supported on a honeycomb structure base material.
The deodorizing device described in. 4. A large number of parallel small hole passages 3 penetrating the front and rear end faces are provided on the upstream side of the ozone generating ultraviolet lamp 4 in the flow passage 1 for the gas to be treated G. The deodorizing device according to claim 1, wherein the upstreammost honeycomb structure 2D whose wall surface is formed by the photoexcitation catalyst-containing layer is provided. 5. A plurality of parallel small hole passages 3 penetrating between front and rear end faces are provided in the flow passage 1 for the gas to be treated G, downstream of the ozone decomposing ultraviolet lamp 5, and the small holes are formed. Passage 3
The deodorizing device according to claim 1, 2, 3 or 4, wherein the wall surface of the honeycomb structure is provided with the most downstream honeycomb structure 2E having an ozone decomposition catalyst containing layer.