JP5344461B2 - Photocatalyst purification device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning apparatus using a photocatalyst, the cleaning efficiency of which is made high by using a photocatalytic reaction. <P>SOLUTION: The cleaning apparatus using the photocatalyst is provided with: a bar-shaped UV lamp 20 for emitting light; and a photocatalytic filter 10 in which the light emitted from the UV lamp 20 is received and a fluid is cleaned by the photocatalytic reaction. The UV lamp 20 is arranged so that the longitudinal direction thereof is made perpendicular to the flow direction of the fluid to be cleaned and the photocatalytic filter 10 is arranged in such a position that the periphery of the light emission surface of the UV lamp 20 is surrounded by the photocatalytic filter along the longitudinal direction thereof. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a photocatalyst purification device that causes a photocatalytic reaction by irradiating a photocatalyst filter with ultraviolet rays and purifies a fluid that comes into contact therewith.

  Conventionally, a purification device using a photocatalyst such as titanium oxide has been widely used to purify a fluid containing a low-concentration contaminant. In such a purification device, by irradiating light to a photocatalyst such as titanium oxide, electrons and holes are generated on the surface of titanium oxide, and using a characteristic that a reduction reaction by electrons and an oxidation reaction by holes occur, Decomposes organic matter.

  In general, a photocatalyst is used to remove organic substances by utilizing a strong oxidizing action generated by irradiation of light from the sun or an ultraviolet lamp, particularly ultraviolet rays (UV) having a wavelength of about 380 nm or less. However, since a photocatalyst such as titanium oxide is usually in a powder form, it becomes a problem how to fix it in the purification apparatus.

  In order to solve the above problem, in Patent Document 1, a sponge-like porous structure photocatalyst filter having a titanium oxide film formed on the surface thereof is disposed in a container, and the flow path in the container is changed to change the fluid. A fluid purification device that lengthens a residence path is disclosed.

  Further, Patent Document 2 discloses an air purification device that removes deposits accumulated on the surface of the photocatalyst by heating the photocatalyst and regenerates (reactivates) the photocatalyst. In the air purification apparatus of Patent Document 2, in an apparatus having a double pipe structure including an inner pipe and an outer pipe, a photocatalyst porous body is filled between the outer pipe and the inner pipe to constitute an air purification section.

  Further, Patent Document 3 discloses a photocatalyst, a purification device, and the like that are less likely to experience a decrease in activity with the passage of time of use. In the fluid purification device of Patent Document 3, a small filling chamber is filled with a composite of a photocatalyst and an adsorbent along the lamp axis of the black light.

  Patent Document 4 discloses a circulating photocatalyst photocatalyst purification device that circulates a purification gas to produce a cleaner purification gas in a gas photocatalyst purification device using a photocatalyst agent. In the circulation photocatalyst photocatalyst purification device of Patent Document 4, photocatalyst filters and arc tubes are alternately arranged so that gas flows in a direction perpendicular to the longitudinal direction of the arc tube.

  Further, Patent Document 5 discloses an air purification system that is equipped with a reproducible photocatalyst filter that can remove catalyst poisoning components by washing with water and the like, and has improved air volume processing and maintainability. In the air purification system of Patent Document 5, a three-dimensional ceramic porous material is used as a photocatalytic filter, and the photocatalytic filters are arranged in multiple layers at positions in the vertical direction of the light source lamp.

Patent Document 6 discloses a silicon carbide-based heat resistant ultralight porous material that maintains the shape of a sponge-like porous structure.
JP 2006-159029 A (released on June 22, 2006) JP 2002-320664 A (published on November 05, 2002) JP 2002-028498 A (released on January 29, 2002) JP 2004-330149 A (released on November 25, 2004) Japanese Patent Laying-Open No. 2005-205094 (published Aug. 04, 2005) Japanese Unexamined Patent Publication No. 2003-119085 (published on August 04, 2005)

  However, in the above conventional configuration, light such as ultraviolet rays emitted from the lamp serving as the light source cannot be effectively used due to the positional relationship between the lamp serving as the light source and the photocatalytic filter, resulting in a problem that the purification efficiency due to the photocatalytic reaction is low. If it is the said conventional structure, since it becomes the structure which arrange | positions a plate-shaped photocatalyst filter in either the right and left or upper and lower sides of a light source body lamp, it irradiates with respect to the upper and lower sides or right and left which are not arrange | positioned. The light was wasted. A specific example will be described below.

  FIG. 3 is a schematic diagram showing the configuration of a conventional photocatalytic purification device. 3 includes a photocatalytic filter 110, an ultraviolet lamp 120, a prefilter 16, a sterilizing filter 18, and a fan 60. Each of these members is housed in a case made of glass or metal, and each filter and lamp are arranged in a vent for allowing a fluid such as gas or liquid to pass through.

  The fluid to be purified is sucked from an intake port not shown in the drawing provided on the left side of FIG. 3, and passes through the prefilter 16, the plurality of photocatalytic filters 110, and the sterilization filter 18 in this order. In this state, it is discharged from the discharge port of the purification device.

  However, in the purification apparatus as shown in FIG. 3, although ultraviolet rays are irradiated from the left and right directions of the photocatalyst filter 110, most of the ultraviolet rays irradiated from the ultraviolet lamp 120 are based on the positional relationship between the lamp serving as the light source and the photocatalytic filter. Are not effectively utilized in photocatalytic reactions.

  Specifically, the space between the ultraviolet lamp 120 arranged on the upper side in FIG. 3 and the ultraviolet lamp 120 arranged on the lower side in FIG. The amount of irradiation of ultraviolet rays increases due to the overlap with the irradiation light from the ultraviolet lamp 120 on the side, but the ultraviolet rays in this part are not used effectively because they are not irradiated on the filter. On the other hand, the upper and lower ends of the photocatalytic filter 110 are irradiated with ultraviolet rays from a single ultraviolet lamp 120, and therefore the amount of irradiated ultraviolet rays is set at the central portion of the photocatalytic filter 110. Compared to Also, since the light intensity is inversely proportional to the square of the distance, it is desirable to install a filter as close to the light source as possible.

  In general, since the decomposition efficiency of organic substances by the photocatalytic reaction is not so high, it is necessary to effectively irradiate the photocatalytic filter 110 with ultraviolet rays in order to make the purification function function effectively.

  The present invention has been made in view of the above problems, and an object of the present invention is to realize a photocatalytic purification device having high purification efficiency by a photocatalytic reaction.

  In order to solve the above problems, a photocatalyst purification device according to the present invention transmits a rod-shaped light source body lamp that irradiates light, a fluid to be purified, and is irradiated with light from the light source body lamp. A photocatalytic purification device comprising a photocatalytic filter that purifies the fluid by a photocatalytic reaction according to the above, wherein the light source body lamp is arranged so that a longitudinal direction thereof is orthogonal to a direction in which the fluid flows, The light source body lamp is formed so as to surround the periphery of the light source body lamp along the longitudinal direction of the light source body lamp.

  According to said structure, since the photocatalyst filter is arrange | positioned so that the circumference | surroundings of the light emission surface of the light source body lamp arrange | positioned so that a longitudinal direction may orthogonally cross with respect to the direction through which a fluid passes may be enclosed along a longitudinal direction. The light emitted from the light emitting surface of the light source body lamp can be irradiated to the photocatalytic filter without waste. As a result, the light emitted from the light source body lamp can be used more efficiently in the photocatalytic filter, so that the amount of light irradiated to the photocatalytic filter increases, and as a result, the fluid is purified by the photocatalytic reaction of the photocatalytic filter. Efficiency can be increased.

  In order to solve the above problems, a photocatalyst purification device according to the present invention transmits a rod-shaped light source body lamp that irradiates light, a fluid to be purified, and is irradiated with light from the light source body lamp. A photocatalytic purification device comprising a photocatalytic filter that purifies a fluid by a photocatalytic reaction by the photocatalytic filter, wherein the photocatalytic filter extends in a direction orthogonal to the fluid flow direction, and the light source body lamp is inserted in a longitudinal direction The lamp opening is formed, and the light source body lamp is inserted into the lamp opening.

  According to said structure, the light irradiated from a light source body lamp will be irradiated to a photocatalyst filter without waste in the opening part for lamps. Thereby, since the irradiation amount of the light with respect to a photocatalyst filter increases, the purification efficiency by the photocatalytic reaction of a photocatalyst filter can be improved.

  In the said photocatalyst purification apparatus, it is preferable that the said several light source body lamp is arrange | positioned in the position where the irradiation light quantity to the photocatalyst filter from the light emission surface of the said light source body lamp becomes substantially the same amount.

  Since the irradiated surface of the photocatalyst filter is disposed at a position where the amount of light irradiated from the light emitting surface of the light source body lamp is substantially the same, the purification capability by the photocatalytic reaction becomes substantially equal on the photocatalytic filter, and the photocatalyst The fluid can be purified on average regardless of the position where the fluid to be purified contacts on the filter. As a result, there is a further effect that the fluid can be purified with high efficiency as a whole.

  A plurality of the lamp openings are provided in the vertical and horizontal directions. When the horizontal direction is the row direction and the vertical direction is the column direction, the lamp openings do not overlap in the column direction between adjacent rows. It is preferable that they are arranged.

  As a result, the openings for the lamps do not overlap in the vertical direction, in other words, they are arranged in a staggered manner, thereby reducing the region where the irradiation light overlaps the photocatalytic filter existing between adjacent light source body lamps. In addition, the amount of irradiation light can be made substantially uniform. Thereby, since one light source body lamp can irradiate light almost uniformly with respect to the photocatalytic filter existing in all directions of up, down, left and right, it is sufficient to cause the photocatalytic reaction to occur in the photocatalytic filter with a small number of light source body lamps. Light can be irradiated.

  In the photocatalyst purification apparatus, the photocatalytic filter is preferably made of a sponge-like porous structure made of Si and / or SiC.

  According to the above configuration, the photocatalytic filter is made of a sponge-like porous structure made of Si and / or SiC, and is generally used as a sintered filter for attaching a ceramic slurry to a sponge skeleton and firing it. It is lighter than the sintered filter, is easy to process, has a thin skeleton, good light transmission, and is less susceptible to clogging.

  Since the light source body lamp may be damaged by contact with the photocatalyst filter, the contact preventing member that surrounds the light emitting surface of the light source body lamp along the longitudinal direction and prevents the light source body lamp and the photocatalyst filter from contacting each other. Is preferably formed.

  In addition, examples of the contact preventing member include a metal net, a transparent sheet, a transparent plate, and a transparent tube. In addition, when a polycarbonate having a good transparency but weak against an organic solvent is used, the transparent organic solvent is not violated. What is necessary is just to cover with a transparent protective film etc.

  In the photocatalyst purification device according to the present invention, the light source body lamp is disposed so that a longitudinal direction thereof is orthogonal to a direction in which the fluid flows, and a photocatalytic filter is disposed along the longitudinal direction of the light source body lamp. It is formed so as to surround the periphery.

  According to said structure, there exists an effect that the purification efficiency of the fluid by the photocatalytic reaction of a photocatalyst filter can be improved.

  In the photocatalyst purification device according to the present invention, the photocatalytic filter extends in a direction orthogonal to the fluid flow direction, and has a lamp opening into which the light source body lamp is inserted in the longitudinal direction. The light source body lamp is inserted into the opening.

  According to said structure, there exists an effect that the purification efficiency by the photocatalytic reaction of a photocatalyst filter can be improved.

  An embodiment of the present invention will be described with reference to FIGS. 1 and 2 as follows.

  FIG. 1 is a cross-sectional view of a purification device (photocatalyst purification device) 1 described in the present embodiment. FIG. 2 is a perspective view of the purification device 1 shown in FIG.

  The purification device 1 is provided with a fluid passage opening for allowing the fluid to be purified to pass through the inside of the housing 50, and takes in the fluid from the left side of FIG. 1 and ejects the fluid from the right side.

  On the left side of the housing 50, a ventilation port 54 is formed as a fluid intake port, and a metal net 56 is fitted. On the right side of the housing 50, a fan 60 for the ventilation port 54 is disposed to suck fluid from the fluid intake port. The housing 50 is made of metal or a resin having heat resistance and ultraviolet resistance characteristics.

  In the housing 50, the pre-filter 16, the photocatalytic filter 10, the metal net 22, and the UV lamp 20 are installed in the ventilation hole 54, and the sterilization filter 18 may be further arranged.

  The metal net 22 is installed so as to be sandwiched in the vertical direction between the filters 20 in order to prevent the lightweight filter 20 from being damaged by contact with wind power. The metal mesh 22 is made of a metal mesh that is easy to transmit light and resistant to corrosion, and has a coarse mesh. Further, instead of a metal mesh, a flexible resin or fiber mesh that can withstand a photocatalytic reaction may be used.

  The pre-filter 16 and the sterilization filter 18 are configured by a HEPA (High Efficiency Particulate Air) filter or the like. Further, the photocatalytic filter 10 is provided with a lamp opening 12 for arranging the UV lamp 20. This opening may be square or circular.

The photocatalyst filter 10 is a filter in which a Si / SiC porous body is coated with a photocatalyst. After impregnating a polyurethane sponge skeleton with a phenol resin solution and silicon powder, or further silicon carbide powder, carbonization, reaction firing is performed. In addition, a Si / SiC filter subjected to Si melt impregnation treatment is used. Compared to a conventional sintered filter prepared by attaching ceramic slurry to a sponge skeleton and sintering, the density is about 0.1 g / cm while maintaining the same thickness and the same strength. ^It has a feature of being as light as ³ and easy to process.
It has the feature that it is easy to work.

  In the photocatalyst filter 10, the surface to be irradiated with the photocatalyst filter 10 is arranged at a position where the amount of light emitted from the light emitting surface of the light source body lamp becomes substantially the same. Specifically, since the planar or curved surface of the photocatalytic filter 10 is arranged at a position where the amount of light irradiated from the light emitting surface of the light source body lamp 20 is substantially the same, the purification ability for the photocatalytic reaction is improved on the photocatalytic filter. Since the process is performed substantially evenly, the fluid purification action can be performed on average regardless of the position on the photocatalytic filter, so that the fluid can be purified with high efficiency as a whole.

  Further, in the example of FIGS. 1 and 2, the lamp openings 12 for arranging the UV lamps 20 formed in the photocatalytic filter 10 are located at five locations on the first line from the top and on the second line from the top. Six locations are formed in the third row from the top, and five locations are formed so that the odd-numbered and even-numbered rows do not overlap in the vertical direction, in other words, the lamp openings 12 are staggered in the odd-numbered and even-numbered rows. Are arranged as follows. This is an arrangement for equalizing the distance of the UV light that passes through the photocatalytic filter 10.

  In the example of FIGS. 1 and 2, the lamp openings 12 have only three rows, but the number of rows may be increased as appropriate. In addition, it is desirable to install a mesh of a metal with a coarse mesh that does not block light in the vertical direction so that the photocatalytic filter 10 adjacent in the horizontal direction in FIGS. Since this metal mesh can be fixed by the lamp opening 12 in the vertical direction, it can also be used for fixing the photocatalytic filter 10.

  Specifically, with a # 8 filter (8 cells per inch), a photocatalytic filter made with a sponge has a UV light distance of about 25-35 mm, and with a # 13 filter, about 20-25 mm. The photocatalytic filter made of # 20 (20 cells per inch) sponge is configured to have a distance of about 10 to 15 mm.

  In the present embodiment, a rectangular cylindrical container is made of a polycarbonate thin plate, this container is fixed to the side surface of the casing 50 of the purification device 1, and the UV lamp 20 is inserted into the lamp opening 12 therein. ing. More specifically, a rectangular photocatalyst filter 10 is sequentially disposed between polycarbonate containers, and a metal net is installed in the vertical direction between the polycarbonate container.

  Although polycarbonate has heat resistance and translucency, it has a disadvantage that it is weak against organic solvents. Therefore, it is preferable to wind a plastic transparent film resistant to organic solvents on the outside of the polycarbonate. As a material of the transparent film, various plastic films such as Dura seal, Teflon (registered trademark) (PFA), acrylic, polyethylene and the like can be used.

  The UV lamp 20 includes a fluorescent lamp type black light (wavelength: about 350 nm), a chemical lamp (wavelength: about 350 nm), a germicidal lamp (wavelength: about 254 nm), and the like, and is provided in the photocatalytic filter 10. It is disposed in the opening 12 for use. In addition, since there are few materials which permeate | transmit the short wavelength of a germicidal lamp, it is preferable to use a black light or a chemical lamp.

  The net 56 is a metal mesh made of metal such as stainless steel having high rigidity, and plays a role of fixing the prefilter 16 and the like in the housing 50 while taking the fluid to be purified from the left side of FIGS. 1 and 2. The casing 50 is made of a metal plate or the like, and fixes the photocatalytic filter 10 and the UV lamp 20 in the purification device 1 and secures a ventilation port 54 through which the fluid to be purified passes.

  The fluid to be purified is taken in from the left side of FIG. 1 and FIG. 2 by being sucked by the fan 60, passes through the net 56 and the prefilter 16, passes through the sterilization filter 18 while being in contact with the photocatalytic filter 10, It is ejected from the right side of FIG. 1 and FIG. The fluid to be purified is purified by the organic substance decomposing action of the photocatalytic reaction generated when the UV light irradiated from the UV lamp 20 reacts with the photocatalytic filter 10 when contacting the photocatalytic filter 10.

  Basically, decomposition of an organic substance by a photocatalyst is caused by ultraviolet light (UV) hitting the photocatalyst, and the organic substance needs to come into contact with the photocatalyst. Since the light intensity is also inversely proportional to the square of the distance, it is most efficient to use light (UV) near the light source. For this reason, when compared with the conventional method in which no filter is arranged in the space between the UV lamps where light is most collected, the efficiency (at least 2 to 3 times or more) from the area (volume) of the filter irradiated with light Can be expected.

  As described above, the purification apparatus 1 according to the present embodiment transmits the rod-shaped UV lamp 20 that irradiates light and the fluid to be purified, and also by the photocatalytic reaction caused by the irradiation of light from the UV lamp 20. The purification device 1 includes a photocatalytic filter 10 that purifies the fluid, and the UV lamp 20 is arranged so that the longitudinal direction thereof is orthogonal to the fluid flow direction. It is formed so as to surround the periphery of the V lamp 20 along the longitudinal direction.

  According to said structure, the photocatalytic filter 10 is arrange | positioned so that the circumference | surroundings of the light emission surface of the UV lamp 20 arrange | positioned so that a longitudinal direction may orthogonally cross with respect to the direction through which a fluid passes along a longitudinal direction. Therefore, it is possible to irradiate the photocatalytic filter 10 with light irradiated from the light emitting surface of the UV lamp 20 without waste. Thereby, since the light irradiated from the UV lamp 20 can be used more efficiently in the photocatalytic filter 10, the amount of light irradiation to the photocatalytic filter 10 increases, and as a result, the photocatalytic reaction of the photocatalytic filter 10 results. Fluid purification efficiency can be increased. Further, since the lamp opening is formed, the replacement when the lamp is burned out can be easily performed.

  The purification apparatus 1 according to the present embodiment transmits a rod-shaped UV lamp 20 that irradiates light and a fluid to be purified, and purifies the fluid by a photocatalytic reaction by receiving light irradiation from the UV lamp 20. A purification device 1 having a photocatalytic filter 10, wherein the photocatalytic filter 10 extends in a direction perpendicular to the fluid flow direction, and forms a lamp opening 12 into which a UV lamp 20 is inserted in the longitudinal direction. The UV lamp 20 is inserted into the lamp opening.

  According to the above configuration, the light irradiated from the UV lamp 20 is irradiated onto the photocatalytic filter 10 without waste in the lamp opening 12. Thereby, since the irradiation amount of the light with respect to the photocatalyst filter 10 increases, the purification efficiency by the photocatalytic reaction of the photocatalyst filter 10 can be improved.

  In the purification device 1 of the present embodiment, the irradiated surface of the photocatalytic filter 10 is disposed at a position where the amount of light irradiated from the light emitting surface of the UV lamp 20 becomes substantially the same amount.

  Since the irradiated surface of the photocatalytic filter 10 is disposed at a position where the amount of light irradiated from the light emitting surface of the UV lamp 20 is substantially the same, the purification ability by the photocatalytic reaction becomes substantially equal on the photocatalytic filter 10, Regardless of the position where the fluid to be purified contacts on the photocatalytic filter 10, the fluid can be purified on average. This makes it possible to purify fluid with high efficiency as a whole.

  In the purification device 1 of the present embodiment, a plurality of lamp openings 12 are provided in the vertical and horizontal directions. When the horizontal direction is the row direction and the vertical direction is the column direction, the lamp openings 12 are adjacent to each other. It is arranged so that it doesn't overlap in the column direction between rows.

  Thereby, the area | region with which irradiation light overlaps with respect to the photocatalyst filter 10 which exists between the adjacent UV lamps 20 because each lamp opening part 12 does not overlap in the vertical direction, in other words, is alternately arranged. And the amount of irradiation light can be made substantially uniform. As a result, one UV lamp 20 can irradiate light almost uniformly onto the photocatalytic filter 10 that exists in all directions, up, down, left, and right, so that a small number of UV lamps 20 cause the photocatalytic reaction to occur in the photocatalytic filter 10. Sufficient light can be irradiated. In addition, the fluid flow is also easily stirred and becomes uniform.

  In the purification device 1, the photocatalytic filter 10 is made of a sponge-like porous structure made of Si and / or SiC.

  According to the above configuration, the photocatalytic filter 10 is made of a sponge-like porous structure made of Si and / or SiC, and is generally used for sintering by attaching a ceramic slurry to a sponge skeleton and firing it. It has the same strength as the filter, is lighter than the sintered filter, is easy to process, and is less likely to clog.

  In the purification apparatus 1, the UV lamp 20 may be damaged by contact with the photocatalytic filter 10. Therefore, the UV lamp 20 and the photocatalytic filter are surrounded by surrounding the light emitting surface of the UV lamp 20 along the longitudinal direction. The contact prevention member which prevents the contact of 10 is formed.

  In addition, as the contact preventing member, a metal net, a transparent sheet, a transparent plate, a transparent tube, or the like can be used. Or when the contact prevention member made from a transparent polycarbonate is used, what attached the organic solvent protective film to the surface may be used.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the photocatalyst purification apparatus and purification apparatus with high purification efficiency by photocatalytic reaction are realizable.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention and is a cross-sectional view illustrating a configuration of a main part of a purification device. It is a perspective view of the said purification apparatus. It is a schematic diagram showing a prior art and showing a main part configuration of a purification device.

Explanation of symbols

1 Purification device (photocatalytic purification device)
10 Photocatalytic filter (photocatalytic filter)
12 Lamp opening 16 Pre-filter 18 Sterilization filter 20 UV lamp (light source lamp)
50 Housing 54 Ventilation 56 Net 60 Fan

Claims (3)

A rod-shaped light source body lamp that emits light;
A photocatalytic purification device comprising a photocatalytic filter that transmits a fluid to be purified and that purifies the fluid by a photocatalytic reaction by receiving light from the light source body lamp,
The light source body lamp is arranged so that a longitudinal direction thereof is orthogonal to a direction in which the fluid flows,
The photocatalytic filter is formed so as to surround the periphery of the light source body lamp along the longitudinal direction of the light source body lamp ,
A photocatalytic purification device, wherein a contact preventing member is formed to surround a light emitting surface of the light source body lamp along a longitudinal direction and prevent contact between the light source body lamp and the photocatalytic filter . 2. The photocatalyst purification device according to claim 1 , wherein a plurality of the light source body lamps are arranged at positions where the amount of light irradiated from the light emitting surface of the light source body lamp to the photocatalyst filter becomes substantially the same amount. The photocatalyst purification device according to claim 1 or 2, wherein the photocatalytic filter comprises a sponge-like porous structure made of Si and / or SiC.

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