JP2003310741A - Ultraviolet irradiating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultraviolet irradiating device which improves the processing capacity. <P>SOLUTION: This ultraviolet irradiating device is provided with an ultraviolet lamp 1 inside, cylindrical containers 5a and 5b being connected in series with both inner surfaces coated with a photocatalyst, a fluid guiding passage 7 which guides a fluid to be processed to the container 5a through the connection with the top of the container 5a, and an ozone injection means for injecting ozone into the fluid guiding passage 7. The ozone injection means is composed of an ultraviolet-transmitting tube 3 which, when the ultraviolet lamp 1 is inserted into the tube 3, separates the ultraviolet lamp 1 from the fluid to be processed in the containers 5a and 5b, an oxygen supply passage 11 which supplies oxygen or an oxygen-containing gas into the ultraviolet-transmitting tube 3, and an ozone injection passage 13 which guides the gas contained in the ultraviolet-transmitting tube 3 to the fluid guiding passage 7. Thanks to this structure, the ultraviolet rays which are supposed to be reached and absorbed by the containers 5a and 5b in conventional devices can be used for the photocatalyst reaction on the photocatalystic layer coating the inner surface of the containers 5a and 5b, therefore improving not only the efficiency in using ultraviolet rays but also the processing capacity of the ultraviolet irradiating device itself. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet irradiation device for irradiating a gas or liquid with ultraviolet rays to decompose harmful substances contained in the gas or liquid.

[0002]

2. Description of the Related Art An ultraviolet irradiation device is used which decomposes a harmful substance or the like by containing a gas or liquid containing a harmful substance or the like in a container having an ultraviolet lamp installed therein and irradiating it with ultraviolet rays. . Further, in order to increase the generation of radicals having an oxidizing ability to oxidize and decompose harmful substances, silica gel carrying a photocatalyst such as titanium oxide on the outer surface of the ultraviolet lamp or the outer surface of the ultraviolet ray transmitting tube in which the ultraviolet lamp is inserted, etc. There has been proposed an ultraviolet irradiating device in which is adhered, an ultraviolet irradiating device in which an ultraviolet lamp is installed, and ozone is blown from the bottom of a tank containing the liquid to be treated.

[0003]

By the way, in the conventional ultraviolet irradiation apparatus as described above, for example, the ultraviolet rays irradiated to the fluid to be treated by the ultraviolet lamp and reaching the inner surface of the container in which the ultraviolet lamp is installed are However, it is absorbed by the inner surface of this container and is not used for decomposition of harmful substances and is wasted. Therefore, the processing capacity of the ultraviolet irradiation device is improved by reducing the ultraviolet rays that are not used for decomposing such harmful substances and improving the utilization efficiency of the ultraviolet rays emitted from the ultraviolet lamp for the treatment of the fluid to be treated. Is desired.

An object of the present invention is to improve the processing capacity of an ultraviolet irradiation device.

[0005]

The ultraviolet irradiating device of the present invention solves the above-mentioned problems by forming a container in which an ultraviolet lamp is installed by coating the inner surface with a photocatalyst.

With such a structure, the ultraviolet rays radiated to the fluid to be treated from the ultraviolet lamp and reaching the inner surface of the container in which the ultraviolet lamp is installed reacts with the photocatalyst coated on the inner surface of the container. Used to increase the generation of oxidative radicals. Therefore, since the ultraviolet rays reaching the inner surface of the container are used to generate radicals that oxidize and decompose harmful substances, the utilization efficiency of the ultraviolet rays emitted from the ultraviolet lamp for the treatment of the fluid to be treated is improved, and the ultraviolet irradiation is performed. The processing capacity of the device can be improved.

Further, if the structure is provided with a processed-fluid introducing passage communicating with the container for guiding the treated fluid to the container, and an ozone injecting means for injecting ozone into the treated-fluid introducing path, the treated object is treated. Ultraviolet rays are emitted while ozone is blown into the fluid. Therefore, since radicals that oxidize and decompose harmful substances from ozone are generated, the generation of radicals due to irradiation with ultraviolet rays is further increased, and the processing capacity of the ultraviolet ray irradiation device can be further improved, which is preferable.

Further, a plurality of cylindrical containers in which the ultraviolet lamps extend in the vertical direction are provided, and one of the plurality of containers has an upper end portion in which the fluid to be treated introduction passage is communicated. The plurality of containers are connected in series to form a flow path for the fluid to be processed. With such a configuration, the fluid to be treated containing ozone flows in a plurality of cylindrical containers extending in the vertical direction, for example, from the upper end to the lower end in the first container, and in the next container. It will flow from the lower end to the upper end. Therefore, when the fluid to be treated is a liquid, in the container that flows from the upper end toward the lower end, the bubbles are sheared by the buoyancy acting on the bubbles containing ozone and the shearing force generated by the descending flow of the liquid to be treated. Dissolution in the liquid to be treated is promoted. On the other hand, in the container that flows from the lower end to the upper end, the bubbles containing ozone float up, the flow velocity of the bubbles becomes relatively high and the mixing power increases, and the dissolution of ozone in the liquid to be treated is further promoted. To be done. In order to generate radicals from ozone by irradiation of ultraviolet rays, ozone needs to be dissolved in the liquid to be treated, so that the dissolution of ozone in the liquid to be treated is promoted and the amount of radicals generated is further increased. This is preferable because the number of the ultraviolet rays can be increased and the processing ability of the ultraviolet irradiation device can be further improved. On the other hand, even when the fluid to be processed is a gas, the irradiation time of the ultraviolet rays to the gas to be processed and the reaction time with the radicals become long, so that the processing capacity of the ultraviolet irradiation device can be further improved.

Further, the ozone injection means has an ultraviolet lamp inserted therein, and an ultraviolet ray transmitting tube for separating the ultraviolet ray lamp from the fluid to be treated in the container, and an oxygen supply channel for supplying oxygen or an oxygen-containing gas into the ultraviolet ray transmitting tube. And a flow path for ozone injection for guiding the gas in the ultraviolet ray transmission tube to the flow path for introducing the fluid to be treated. Such a configuration is preferable because it is not necessary to separately prepare an ozone supply unit or the like for supplying ozone to be injected into the fluid to be processed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an ultraviolet irradiation apparatus to which the present invention is applied will be described below with reference to FIGS. 1 and 3. FIG. 1 is a cross-sectional view showing a schematic configuration and operation of an ultraviolet irradiation device to which the present invention is applied, as seen from a side surface side. FIG. 2 is an enlarged sectional view showing the upper end portion of the container. FIG. 3 is an enlarged sectional view showing the bottom of the ultraviolet ray transmitting tube. In the present embodiment, the case where the fluid to be processed is a gas is described as an example, but the ultraviolet irradiation device of the present invention may be, for example, a seawater sterilizer, a VOC vapor phase ultraviolet decomposer, or a PhotoFenton reactor. It can be used as a device for decomposing harmful substances with various ultraviolet rays, and can also be applied to liquid treatment.

As shown in FIG. 1, the ultraviolet irradiation apparatus of this embodiment has two containers 5a, 5b and a container 5 in each of which an ultraviolet transmission tube 3 in which an ultraviolet lamp 1 is inserted is installed.
a to-be-processed fluid introduction pipe line 7 which is a flow path which communicates with a and guides a to-be-processed gas into the container 5a. Oxygen supply conduit 1 serving as a flow path for supplying oxygen or an oxygen-containing gas into the processing fluid outflow conduit 9 and the ultraviolet ray transmission conduit 3.
1. Ozone injection conduits 13 and 2 which serve as flow paths for guiding a gas containing ozone generated by irradiation of oxygen into the ultraviolet ray transmission tube 3 from the ultraviolet ray transmission tube 3 to the fluid introduction tube 7 to be treated. One container 5a, 5b is installed inside,
Cooling tank 15 containing water 14 as a liquid for cooling a and 5b, and control unit 1 for controlling lighting of ultraviolet lamp 1
It is composed of 7, etc.

The ultraviolet lamp 1 is a general straight-tube low-pressure mercury lamp which emits ultraviolet rays having a wavelength of 254 nm and ultraviolet rays having a wavelength of 185 nm. The ultraviolet ray transmitting tube 3 is a tube formed of an ultraviolet ray transmitting material having one end closed and the other end opened, for example, quartz glass or Teflon (registered trademark). The ultraviolet lamp 1 is inserted in the ultraviolet transmission tube 3.

The two containers 5a and 5b are made of vinyl chloride,
A cylindrical body 19, a bottom member 21 for closing one end of the body 19,
It is composed of a lid member 23 and the like provided at the other end. The photocatalyst layer 24 is formed by coating the inner surface of the body 19 with titanium oxide (TiO ₂ ) which is a photocatalyst. The photocatalyst is the ultraviolet lamp 1 other than the inner surface of the body 19.
Can be coated on the inner surface of the containers 5a, 5b to which the ultraviolet rays from the above are irradiated, or a part of the inner surface of the body 19 can be coated. It is desirable that the photocatalyst layer 24 is formed by always coating.

At the center of the inner bottom surface of the bottom member 21, a support portion 25 for supporting the closed end portion of the ultraviolet ray transmitting tube 3 is formed. The lid member 23 is, as shown in FIG.
In a state where the sealing O-ring 27 placed on the end face of 9 is sandwiched between the end face of the body 19 and the end of the body 19 including this end face and the O-ring 27 are covered by the hem 29,
It is a dome-shaped member fixed to the end of the body 19. At the top of the dome-shaped lid member 23, the protruding portion 3 protruding in a cylindrical shape is formed.
1 is formed. An end of the ultraviolet ray transmitting tube 3 on the opening side is inserted into the cylindrical protruding portion 31, and an inner peripheral surface of the protruding portion 31 and an outer peripheral surface of a portion of the ultraviolet ray transmitting tube 3 inserted into the protruding portion 31. The ultraviolet ray transmitting tube 3 is supported by the lid member 23 with a packing 33 for sealing being sandwiched between them.
Further, the protruding portion 31 of the lid member 23 is inserted and fixed to one end portion of the cylindrical body 35 having an inner diameter corresponding to the outer diameter of the protruding portion 31. The other end of the tubular body 35 is closed by a cap 37.

The containers 5a and 5b having such a structure are shown in FIG.
As shown in FIG. 3, the bottom member 21 is placed downward and the lid member 23 is placed facing upward, and the containers 5 a and 5 b are installed in the cooling tank 15 in a state of being partially immersed in the water 14. Therefore, the ultraviolet lamp 1 inserted in the ultraviolet ray transmitting tube 3 is also accommodated in the container 5 by the supporting portion 25 of the bottom member 21 and the protruding portion 31 of the lid member 23.
It is in a state of being supported in the containers 5a and 5b by extending in the vertical direction coaxially with a and 5b. At this time, the opening of the upper end portion of the ultraviolet ray transmitting tube 3 projects above the projecting portion 31 of the lid member 23, and the upper end portion of the ultraviolet ray transmitting tube 3 and the projecting portion 31 of the lid member 23 are as described above. Since the packing 33 is sandwiched between the container 5a,
The inside of 5b and the inside of the ultraviolet ray transmitting tube 3 are separated airtightly or watertightly.

The fluid introduction pipe line 7 communicates with the upper end of the container 5a. On the other hand, the treated fluid outflow conduit 9 communicates with the upper end of the container 5b. Further, the container 5a and the container 5b are connected to each other by a connection conduit 39 that serves as a flow path that connects the lower ends of the containers 5a and 5b. Therefore, the container 5a
And the container 5b are connected in series. In addition, the treated fluid introduction pipe line 7 and the treated fluid outflow pipe line 9 are
It is installed in a state of penetrating the side wall of the cooling tank 15 from the outside of the cooling tank 15, and is connected to the container 5a and the container 5b, respectively.

The oxygen supply line 11 is connected at one end to a supply source of oxygen or an oxygen-containing gas, for example, an oxygen cylinder, a suitable oxygen supply source 40 capable of supplying oxygen or an oxygen-containing gas such as a blower for sucking and blowing the atmosphere. Has been done. The oxygen supply pipeline 11 is branched into two on the way, and each branched oxygen supply pipeline 11 penetrates the side wall of the tubular body 35 attached to the lid member 23 of the container 5a and the container 5b. It is in a state of being inserted into the ultraviolet ray transmitting tube 3 through the opening of the ultraviolet ray transmitting tube 3, and the other end of the oxygen supply pipe line 11 has a closed end portion of the ultraviolet ray transmitting tube 3 as shown in FIG. That is, it is opened at the bottom of the ultraviolet ray transmission tube 3. Ozone injection line 1
3 is connected at one end to a portion of the treated fluid introducing pipe 7 located outside the cooling tank 15, and is branched into two in the middle.
The other end of each communicates with the cylindrical body 35 attached to the lid member 23 of the container 5a and the container 5b.

The cooling tank 15 includes containers 5a and 5b.
a, a cooling means for cooling from the outside of 5b is configured,
The water level determining conduit 41 that plays the role of an overflow weir for determining the water level of the water 14 in the cooling tank 15 and the portions of the containers 5a and 5b installed in the cooling tank 15 that are not immersed in the water 14 are cooled. A cooling water nozzle 42 for spraying water for use is provided. The water level determination conduit 41 communicates with the bottom of the cooling tank 15,
A pipe that bends and extends upward along the cooling tank 15 and branches into a pipe portion 41a whose upper end is closed and then branches from the pipe portion 41a that extends upward and then bends and descends. The pipe portion 41b is provided, and this pipe portion 41b is provided.
The water level in the cooling tank 15 is determined according to the installation position of the water, and the water 14 in the cooling tank 15 is discharged. The control unit 17
Each of the ultraviolet lamps 1 in the containers 5a and 5b via the wiring 42
The wiring 42 is electrically connected to the container 5a, 5
Wiring is provided by penetrating a cap 37 provided at an open end of a cylindrical body 35 attached to the lid member 23 of FIG.

Further, the ultraviolet irradiation device of this embodiment is
The liquid sealing tank 43 is provided outside the cooling tank 15.
In the liquid sealing tank 43, one end is connected to the outer bottom surface of the bottom member 21 of the containers 5a and 5b, and the pipes communicating with the bottoms of the containers 5a and 5b join to form a single drain pipe. Road 45
Is inserted into the liquid sealing tank 43 above the water level in the liquid sealing tank 43, and is installed in a state of extending toward the bottom of the liquid sealing tank 43, and the other end of the drain conduit 45 is It opens at the bottom of the liquid sealing tank 43. Further, in the liquid sealing tank 43, the liquid sealing tank 4
3 plays a role of an overflow weir that determines the water level in 3 and a water level determining conduit 45 provided with a water level determining conduit 45 that discharges water in the liquid sealing tank 43 is a bottom portion in the liquid sealing tank 43. From above, it extends upward, bends at a portion having a desired water level and penetrates the side wall of the liquid sealing tank 43, and then further bends and descends. Further, a pressure equalizing pipe 47 is provided between the lid at the upper end of the liquid sealing tank 43 and the treated fluid outflow conduit 9 to connect the inside of the liquid sealing tank 43 and the treated fluid outflow conduit 9 to each other. There is. The water level in the liquid-sealing tank 43 depends on the containers 5a, 5b.
It is set lower than the bottom of the.

The operation of the ultraviolet irradiating device having such a structure and the characteristic part of the present invention will be described. The gas to be processed is shown in FIG.
As shown in FIG. 5, the fluid to be treated flows into the container 5 a from the pipeline 7. At this time, as shown in FIG. 3, oxygen or an oxygen-containing gas is sent from the oxygen supply source 40 to the bottom of the ultraviolet ray transmission tube 3 installed in the containers 5a and 5b via the oxygen supply line 11. Come on. Therefore, the oxygen supply line 11
Oxygen or oxygen-containing gas flowing out of the ultraviolet ray transmitting tube 3 rises along the ultraviolet ray lamp 1 in the ultraviolet ray transmitting tube 3, and during this time, oxygen absorbs the ultraviolet ray having a wavelength of 185 nm emitted from the ultraviolet ray lamp 1. Ozone is generated at. The generated gas containing ozone is injected into the to-be-processed fluid introduction pipe line 7 through the tubular body 35 attached to the lid member 23 of the containers 5a and 5b, and the ozone injection pipe line 13 to introduce the to-be-processed fluid introduction. It is mixed with the gas to be treated flowing in the pipe 7.

The gas to be treated containing ozone is stored in the container 5a.
And flows into the container 5a from the upper end to the lower end of the container 5a. Further, the gas to be processed flows into the container 5b through the connecting pipe 39, flows through the container 5b from the lower end to the upper end of the container 5b, and is discharged from the processed fluid outflow pipe 9. It During this time, the gas to be processed is irradiated with ultraviolet rays from the ultraviolet lamp 1, and among the irradiated ultraviolet rays, the ultraviolet rays having a wavelength of 254 nm are absorbed in the ozone contained in the gas to be processed, so that Reacts with the water vapor of to generate OH radicals.

Further, the fluid to be processed is passed therethrough and the container 5a,
The ultraviolet ray having a wavelength of 254 nm that has reached the inner surface of 5b is absorbed by the photocatalyst layer 24 and induces a catalytic reaction of the photocatalyst, and reacts with water vapor in the gas to be treated to generate superoxide (O ²⁻ ) and OH radicals. . Further, among the ultraviolet rays emitted from the ultraviolet lamp 1 to the gas to be treated, the ultraviolet rays having a wavelength of 185 nm are absorbed by the water vapor in the gas to be treated and generate OH radicals. Radicals such as OH radicals and superoxide generated by the irradiation of these ultraviolet rays are oxidizing agents, and are harmful substances contained in the gas to be treated, for example, volatility-induced chlorine compounds (hereinafter referred to as VO).
Oxidative decomposition such as C) occurs.

The water vapor in the gas to be processed flowing in the containers 5a and 5b is the water in the cooling tank 15 or the cooling water nozzle 4.
The water jetted from the water cools the containers 5a and 5b to cool them, thereby forming dew on the inner surfaces of the containers 5a and 5b, that is, the surface of the photocatalyst layer 24. The dew condensation water flows down in the containers 5a and 5b toward the lower end portion, is naturally flown by the drain pipe 45 to the liquid sealing tank 43, and is discharged from the water level determining pipe 45 provided in the liquid sealing tank 43. .

As described above, in the ultraviolet irradiation device of this embodiment, since the titanium oxide as the photocatalyst is coated on the inner surfaces of the containers 5a and 5b to form the photocatalyst layer 24,
The fluid to be processed is irradiated from the ultraviolet lamp 1, and the container 5a,
The ultraviolet rays that have reached the inner surface of 5b are used for the photocatalytic reaction in the photocatalyst layer 24 on the inner surfaces of the containers 5a and 5b, and increase the generation of radicals such as OH radicals and superoxide having an oxidizing ability. Therefore, in the conventional ultraviolet irradiation device, the ultraviolet light that was wasted due to being absorbed by the inner surface of the container,
Since it is used to generate radicals that oxidize and decompose harmful substances, the utilization efficiency of the ultraviolet rays emitted from the ultraviolet lamp for the treatment of the fluid to be treated is improved, and the treatment capacity of the ultraviolet irradiation device can be improved.

Further, as in this embodiment, the containers 5a, 5
When b is a PVC pipe, if the PVC pipe is directly irradiated with ultraviolet rays, the PVC pipe deteriorates.
By coating titanium oxide, which is a photocatalyst, on the inner surface of b, the PVC pipe is protected from ultraviolet rays and the service life is improved. In addition, although the containers 5a and 5b can be formed of SUS or the like, when hydrochloric acid is generated due to the decomposition of VOC, the atmosphere may corrode SUS. However, as in the present embodiment, the inner surfaces of the containers 5a and 5b are coated with titanium oxide as a photocatalyst, so that corrosion can be prevented.

Further, in the ultraviolet irradiation apparatus of this embodiment, ozone is injected into the fluid to be processed flowing through the fluid to be treated introduction path 7, and the ultraviolet ray is emitted from the ultraviolet lamp 1 to the fluid to be processed containing ozone. . Therefore, from ozone to OH
Radicals are generated, and the generation of radicals having an oxidizing ability by irradiation with ultraviolet rays is further increased, so that the throughput of the ultraviolet ray irradiation device can be further improved. Moreover, since the containers 5a and 5b are connected in series, the flow of the gas to be processed in the containers 5a and 5b becomes an extruding flow, and the irradiation time of the ultraviolet rays to the gas to be processed and the reaction time with the radicals become long. Therefore, the processing capacity of the ultraviolet irradiation device can be further improved.

In addition, in this embodiment, the ultraviolet ray transmitting tube 3 is used.
Oxygen or an oxygen-containing gas is supplied into the inside of the tube, and ozone is generated by the irradiation of ultraviolet rays from the ultraviolet lamp 1 in the ultraviolet ray transmitting tube 3, and the ozone is injected into the treated fluid introduction pipe line 7. It is not necessary to separately provide ozone supply means such as an ozone generator in order to obtain ozone to be injected into the processing gas. Therefore, the device configuration can be simplified and the cost can be reduced.

By the way, the ultraviolet lamp, which is a general low-pressure mercury lamp used in the present embodiment, mainly emits an ultraviolet ray having a wavelength of 254 nm and a portion of an ultraviolet ray having a wavelength of 185 nm. When the fluid to be treated containing harmful substances is irradiated with the ultraviolet rays emitted from the ultraviolet lamp, ultraviolet rays having a wavelength of 185 nm act on the decomposition of the harmful substances and the ultraviolet rays having a wavelength of 254 nm mainly emitted from the ultraviolet lamp are emitted. It may make little contribution to the decomposition of harmful substances. Therefore, there is a problem in that the efficiency of utilizing the ultraviolet light emitted from the ultraviolet lamp for decomposing the organic substance and the like is poor only by irradiating the fluid to be treated containing the harmful substance with the ultraviolet light emitted from the ultraviolet lamp.

On the other hand, in the ultraviolet irradiating device of the present embodiment, in addition to the fact that the ultraviolet ray having the wavelength of 185 nm is used for the decomposition of harmful organic substances and the generation of the radicals which oxidatively decompose such substances, the wavelength of 254 nm is also used. Is used for the photocatalytic reaction in the photocatalyst layer 24 on the inner surfaces of the containers 5a, 5b and for the generation of radicals that oxidatively decompose harmful substances from ozone. Therefore, both the ultraviolet rays having the wavelength of 254 nm and the ultraviolet rays having the wavelength of 185 nm can be effectively utilized, and the utilization efficiency of the ultraviolet rays for decomposing the organic substance and the like is improved.

On the other hand, although the case where the fluid to be treated is a gas has been described in the present embodiment, the present invention can be applied to the case where the fluid to be treated is a liquid. Also in this case, in addition to the same effect as when the fluid to be treated is a gas, ozone is blown into the liquid to be treated and the containers 5a and 5b are connected in series, whereby The throughput can be further improved as compared with the case where the fluid is gas. That is, in the conventional ultraviolet irradiation device for treating the liquid to be treated, ozone was blown from the bottom of the container in which the ultraviolet lamp was installed, but the liquid to be treated containing ozone was sufficiently exposed to the ultraviolet rays emitted from the ultraviolet lamp. The length of the UV lamp limits the depth of the container because it needs to be irradiated at a high intensity. Therefore, it is impossible to improve the efficiency of radical generation from ozone by increasing the depth of the container and improving the dissolution efficiency of ozone in the liquid to be treated,
In the conventional ultraviolet irradiation device for treating the liquid to be treated, the dissolution efficiency of ozone in the liquid to be treated is low, for example, 50 to 60%.

On the other hand, the container 5 as in this embodiment
In the ultraviolet irradiation device having a configuration in which a and 5b are connected in series,
Bubbles containing ozone blown into the liquid to be treated flowing through the liquid to be treated introduction passage 7 flow downward in the container 5a along with the liquid to be treated. The shearing force generated by the flow of the treatment liquid promotes the dissolution of ozone in the treatment liquid. Next, in the container 5b, the shearing force against the bubbles weakens, but when the bubbles rise upward in the container 5b, the same 0.3 m as in a normal aeration tank is used.
Dissolution of ozone in the liquid to be treated is promoted by the mixing force generated by the rise of the bubbles at a relatively high flow rate of about / s. Thus, by repeating the downward flow in the container 5a and the upward flow in the container 5b, the dissolution efficiency of ozone in the liquid to be treated can be increased to 90% or more. At this time,
The flow velocity of the liquid to be treated in the container 5a is preferably 0.5 m / s or more. When the ultraviolet irradiation device to which the present invention is applied is used for treating liquid, it is not necessary to provide cooling means such as the cooling tank 15.

Further, in the present embodiment, the ozone injection means for blowing ozone into the fluid to be processed flowing through the fluid introduction passage 7 is provided, but the ozone injection means is not provided. You can also However, the configuration in which the ozone injection means is provided can further improve the processing capacity of the ultraviolet irradiation device as compared with the case where only the inner surfaces of the containers 5a and 5b are coated with the photocatalyst. Further, in the present embodiment, the two containers 5a and 5b are connected in series, but the structure may be provided with only one container.
However, it is better to connect multiple containers in series,
Since the irradiation time of ultraviolet rays and the reaction time of oxidative decomposition by radicals can be lengthened and the dissolved amount of ozone in the liquid to be processed can be increased, the processing capacity of the ultraviolet irradiation device can be further improved.

Further, in this embodiment, as the ozone injecting means, the oxygen or the oxygen-containing gas supplied into the ultraviolet ray transmitting tube 3 is irradiated with ultraviolet rays from the ultraviolet ray lamp 1 to cover the ozone generated in the ultraviolet ray transmitting tube 3. Although the composition is blown into the processing fluid, an ozone supply source may be separately provided. However, the configuration of the ozone injecting means as in this embodiment can simplify the apparatus and reduce the cost.

Further, in this embodiment, a vinyl chloride container 5a,
Although 5b is used, the container can be made of other metal material such as SUS or resin material. When the container is formed of a SUS tube, the cooling tank 15 may be replaced by a water cooling jacket provided on the outer wall surface of the container.

Further, the present invention is not limited to the ultraviolet irradiation device having the structure of this embodiment, but can be applied to various types of ultraviolet irradiation devices having a container in which an ultraviolet lamp is installed.

[0036]

According to the present invention, the processing capacity of the ultraviolet irradiation device can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration and operation of an embodiment of an ultraviolet irradiation device to which the present invention is applied, as seen from a side surface side.

FIG. 2 is an enlarged cross-sectional view showing an upper end portion of a container of an embodiment of an ultraviolet irradiation device according to the present invention.

FIG. 3 is an enlarged sectional view showing a bottom portion of an ultraviolet ray transmitting tube of an embodiment of an ultraviolet ray irradiating device to which the present invention is applied.

[Explanation of symbols]

1 UV lamp 3 UV transmission tube 5a, 5b container 7 Processing fluid introduction channel 9 Processed fluid outflow channel 11 Oxygen supply pipeline 13 Ozone injection line 24 Photocatalyst layer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 1/32 C02F 1/32 1/50 510 1/50 510A 520 520F 531 531R 540 540A 560 560C 1/72 101 1/72 101 1/78 1/78 G21K 5/00 G21K 5/00 Z (72) Inventor Kenichiro Deguchi 5-2-1 Ginza 5-chome, Chuo-ku, Tokyo Chiyoda Industrial Sales Co., Ltd. (72) Inventor Ishida Koji 5-2-1 Ginza, Chuo-ku, Tokyo Chiyoda Kosan Co., Ltd. F-term (reference) 4C080 AA07 AA10 BB05 CC01 HH02 HH05 JJ03 KK02 KK08 LL10 MM02 MM08 NN27 QQ11 4D037 AA06 AB03 BA18 CA12 4D050 AA06 BC06 BD09 A02 4G069 AA03 BA04A BA04B BA48A CA07 EA07 4G075 AA02 AA37 BA05 BA10 CA33 CA51 CA54 DA02 EB01 EB21 EB31 EE31

Claims (4)

[Claims] 1. An ultraviolet irradiation device having a photocatalyst layer formed on the inner surface of a container having an ultraviolet lamp installed therein. 2. A treatment fluid introducing flow path communicating with the container and guiding the treatment fluid to the container, and an ozone injecting means for injecting ozone into the treatment fluid introducing flow path. The ultraviolet processing device according to claim 1. 3. The treatment target fluid introduction flow path is provided at an upper end portion of one of the plurality of cylindrical containers in which the ultraviolet lamps are installed so as to extend in a vertical direction. 3. The ultraviolet irradiation device according to claim 1 or 2, wherein the plurality of containers are connected in series to form a flow path for a fluid to be processed. 4. The ozone injecting means, into which the ultraviolet lamp is inserted, separates the ultraviolet lamp from a fluid to be treated in the container, and an oxygen transmitting tube for supplying oxygen or an oxygen-containing gas to the ultraviolet transmitting tube. The ultraviolet irradiation device according to claim 2 or 3, further comprising a supply flow path and an ozone injection flow path that guides gas in the ultraviolet transmission tube to the flow path for introducing the fluid to be treated.