JPH11179350A - Ultraviolet radiation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultraviolet radiation device wherein even ultraviolet radiation having short wavelength can be efficiently treated using a simple construction. SOLUTION: A bar-shaped ultraviolet lamp 6 is disposed coaxially at the center of a pipe 2 through which a fluid to be treated flows, and a plurality of resistors 1a-1h are arranged in the gap between the lamp and the pipe. And the pipe 2 is formed from ultraviolet-ray transmitting materials so that ultraviolet rays from an ultraviolet lamp 7 disposed outside the pipe 2 can be applied to the fluid in the pipe 2. Moreover each of the resistors is formed into a fan- shaped plate wherein the width of the plate is made narrower toward the center from the outer periphery thereof, and the resistors are arranged in such a manner that they are spaced at regular intervals in the axial direction so as to not to interfere with each other and inclined toward the downstream side and they are spaced by predetermined angles apart one from another in the circumferential direction of the pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet irradiation apparatus for performing an ultraviolet irradiation treatment such as sterilization or oxidative decomposition on a fluid.

[0002]

2. Description of the Related Art There is known an ultraviolet irradiation apparatus for introducing a fluid to be treated into a container and irradiating the fluid with ultraviolet rays from an ultraviolet lamp provided therein to perform an ultraviolet irradiation treatment such as sterilization or oxidative decomposition. I have.

[0003]

In this type of ultraviolet irradiation apparatus, when ultraviolet light having a short wavelength (for example, 184.9 nm) is used, ultraviolet light is greatly attenuated. The area is limited to about 5 to 6 mm, and there is a difficulty in performing efficient processing. This can be achieved by adding a stirring function to the ultraviolet irradiation device, as long as the fluid uniformly passes near the ultraviolet lamp. However, a stirring device is attached to the conventional ultraviolet irradiation device. In such a case, the structure of the apparatus is complicated, the size and the cost are inevitably increased, and it is difficult to expect a sufficiently satisfactory effect.

The present invention has been devised based on the knowledge of the inventor, and a main object of the present invention is to irradiate ultraviolet rays with a simple structure so that efficient processing can be performed even with short wavelength ultraviolet rays. It is to constitute an apparatus.

[0005]

In order to achieve the above object, according to the present invention, a rod-shaped ultraviolet lamp is coaxially disposed at the center of a pipe through which a fluid to be treated flows, and the rod is disposed at the center thereof. A plurality of resistors were provided in the gap between the ultraviolet lamp and the pipe.

[0006] According to this, the ultraviolet light is irradiated from the ultraviolet lamp to the fluid flowing through the gap between the ultraviolet lamp and the pipe. At this time, the fluid is stirred by turbulence generated by a plurality of resistors. . Therefore, the flowing fluid uniformly passes near the ultraviolet lamp, and it is possible to uniformly irradiate the fluid with short-wavelength ultraviolet light having large attenuation. If a plurality of fluids are allowed to flow at the same time, the mixing process and the ultraviolet irradiation process can be performed simultaneously and in parallel. And since a stirring action is obtained by the turbulent flow of the resistor, a complicated moving mechanism is unnecessary, and it is possible to reduce the size and increase the operating cost,
Further, it is possible to achieve excellent maintenance.

In particular, the surface of the resistor is coated with a photocatalytic material, or the entire resistor is formed of a photocatalytic material, and at least the surface portion of the resistor in contact with the fluid is formed of a photocatalytic material such as titanium dioxide. Preferably, according to this, the photochemical reaction by the ultraviolet rays is activated on the surface of the photocatalyst, and the efficiency of the ultraviolet treatment can be remarkably increased. The pipe itself or the inner peripheral surface thereof may be formed of a photocatalytic material, but the resistor is more effective in increasing the contact efficiency between the fluid and the photocatalyst.

In addition, it is preferable that the pipe is formed of an ultraviolet transmitting material, and that the fluid in the pipe is irradiated with ultraviolet rays from an ultraviolet lamp disposed outside the pipe. According to this, it is possible to simultaneously irradiate ultraviolet rays having different wavelengths to the fluid flowing through the pipe, and it is possible to perform a wide range of ultraviolet treatment without increasing the size of the apparatus.
For example, while ultraviolet light of a short wavelength is irradiated from an ultraviolet lamp arranged at the center of the pipe to a fluid flowing in the pipe, ultraviolet light of a long wavelength (for example, 253.7 nm or more) is emitted from an ultraviolet lamp arranged outside the pipe. Can be irradiated.

As the ultraviolet transmitting material for forming the pipe, quartz glass is preferable. According to this, ultraviolet light having a relatively short wavelength can be transmitted, and it is resistant to thermal shock and excellent in chemical durability. In addition, UV-transmitting glass such as silicate-free glass is also possible, and a material capable of transmitting UV light to be irradiated may be appropriately selected depending on the purpose of processing. The form of the ultraviolet lamp disposed outside is not particularly limited as long as it can irradiate ultraviolet light toward the fluid in the pipe. For example, a rod-shaped lamp arranged parallel to the axis of the pipe may be used. By providing a plurality of pipes at equal intervals in the direction, it is possible to irradiate the fluid in the pipe with a substantially uniform irradiation.

[0010] In addition, the plurality of resistors are formed in a substantially fan-shaped plate shape narrowing from the outer peripheral side toward the center, and are mutually inclined in the downstream direction. It is preferable that they are provided at predetermined intervals in the axial direction so as not to come into contact with each other and are sequentially shifted by a predetermined angle in the circumferential direction of the pipe. According to this, the introduced fluid collides with one of the resistors without being short-passed and is dispersed, generating strong turbulence in the pipe and agitating the fluid vigorously, enabling effective stirring and mixing Becomes And
Since it has a relatively simple shape, it is easy to manufacture, and it can be formed integrally with the pipe so as to protrude from the inner peripheral surface of the pipe, thereby suppressing an increase in manufacturing cost. Moreover, since it is hard to be clogged, it is also possible to perform a treatment such as sterilization of a liquid mixed with fibrous material or solid matter.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows an ultraviolet irradiation device configured according to the present invention. The ultraviolet irradiation device includes a pipe 2 having a circular cross-section in which a plurality of substantially fan-shaped resistors 1a to 1h are provided on an inner peripheral surface, a T-shaped pipe 3 joined to one end of the pipe 2, A control unit 4 having a built-in ballast and the like joined to one end of the T-tube 3 and a pipe extending from the control unit 4 and passing through the T-tube 3 in a state covered with a protective glass tube 5. 2 has an ultraviolet discharge tube 6 inserted in the center of the tube 2 and an ultraviolet discharge tube 7 arranged around the pipe 2 so that a fluid to be treated is supplied to an inlet 8 of the T-tube 3.
And collected from the outlet 9 at the other end of the pipe 2. In FIG. 1, the pipe 2 is partially omitted, and resistors similar to the resistors 1a to 1h are provided over the entire length.

The resistors 1a to 1h and the pipe 2 are integrally formed of a quartz glass material so that ultraviolet rays from an ultraviolet discharge tube 7 outside the pipe 2 can be transmitted. The outer ultraviolet discharge tubes 7 are arranged in parallel to the axis of the pipe 2 so that the fluid in the pipe 2 can be irradiated with the ultraviolet light substantially uniformly, and a plurality of the ultraviolet discharge tubes 7 are provided at equal intervals in the circumferential direction. . The surfaces of the resistors 1a to 1h are coated with a photocatalytic material such as titanium dioxide.

The ultraviolet discharge tube 6 arranged inside the pipe 2 emits ultraviolet light having a short wavelength, and for example, a mercury lamp which emits ultraviolet light having a wavelength of 184.9 nm is used. On the other hand, the ultraviolet discharge tube 7 arranged outside radiates ultraviolet light of a long wavelength.
A mercury lamp that emits ultraviolet light of 3.7 nm or more is used. As a result, the fluid flowing through the gap between the protective glass tube 5 and the pipe 2 is irradiated with two types of ultraviolet rays having different wavelengths. In addition, various ultraviolet lamps such as a discharge tube containing hydrogen or a rare gas may be appropriately selected for the two ultraviolet discharge tubes 6 and 7 according to the purpose of processing.

The protective glass tube 5 has an internal ultraviolet discharge tube 6
It is formed of a glass material having a required ultraviolet ray transmissivity capable of transmitting the ultraviolet rays emitted by the above. The T-tube 3 is made of a material having physical properties that are chemically stable to the flowing fluid, for example, a material formed of stainless steel.

The resistors 1a to 1h are plate-like members having a substantially fan shape narrowing from the outer peripheral side toward the central portion. The protective glass tube 5 is formed in an arc shape along the outer peripheral surface of the protective glass tube 5. These resistors 1a to 1h
The angle of inclination of the pipe 2 with respect to the axis of the pipe 2 may be appropriately set according to the intended use, but is preferably about 45 °.

These resistors 1a to 1h are composed of first and second resistors 1a and 1b, third and fourth resistors 1 from the upstream side.
Two adjacent resistors, such as c and 1d, are sequentially arranged at angular positions facing each other in pairs in a C shape. For example, as shown in FIG.
Are arranged at positions vertically opposed to each other. The first and second resistors 1a and 1a
b is formed in mutually different sizes. That is,
The second resistor 1b on the downstream side is replaced with the first resistor 1a on the upstream side.
It is formed larger.

Similarly, the third and fourth resistors 1c
As shown in FIG. 3, the first and second resistors 1c and 1d are also formed at mutually different angular positions, as shown in FIG.
It is arranged at a position shifted 45 degrees in the circumferential direction with respect to 1b. Similarly, the fifth and sixth resistors 1e and 1f, the seventh and eighth resistors 1g,
1h are arranged by being shifted by 45 degrees in the circumferential direction.
Therefore, one of the resistors 1a to 1h, which forms a pair with each other, overlaps with the immediately preceding pair of resistors 1a to 1h. Note that resistors not shown in FIG. 1 provided over the entire length of the element 1 are also arranged at predetermined positions according to the same arrangement rule as described above.

For this reason, when a fluid is introduced into the pipe 2, the flow facing the first resistor 1a on the upstream side collides with the resistor 1a and is dispersed right and left, and the first resistor 1a
The flow that is not relative to
Of the resistor 1b or the resistors 1c to 1h on the downstream side. When the collision and dispersion of the introduced fluid by the resistors 1a to 1h are sequentially repeated in this manner, a strong turbulent flow is generated in the pipe 2, and the fluid is vigorously stirred.

In the above embodiment, the resistor 1
a to 1h and the pipe 2 are made of quartz glass and the pipe 2
When ultraviolet irradiation from the outside is omitted, the pipe 2 and the resistors 1a to 1h may be appropriately made chemically stable with respect to the introduced fluid, such as stainless steel. What is necessary is just to form using a suitable material.

FIG. 4 shows a first modification in which a part of the above embodiment is modified. Here, in order to dispose a plurality of resistors in the gap between the protective glass tube 5 of the ultraviolet discharge tube 6 and the pipe 11, a separate resistor element 12 from the pipe 11 is inserted into the pipe 11. It has a configuration.

The resistor element 12 is formed by integrating a pair of resistors 14a and 14b in a C-shape as described above on the inner peripheral surface of a cylindrical body 13 having an outer diameter that can be inserted into the pipe 11. By inserting a required number of the resistor elements 12 in the circumferential direction and sequentially shifting them by a predetermined angle, a large number of resistor elements 12 are placed in the pipe 11 in accordance with the same arrangement rule as in the above embodiment. Can be placed, making it easier to manufacture. In this case, if the required unevenness is formed at both ends of the cylindrical body 13 so that the adjacent cylindrical bodies 13 are displaced from each other by a predetermined angle in the circumferential direction, the mounting operation of the resistor element 12 to the pipe 11 is performed. And the displacement of the resistor element 12 can be prevented. The resistor element 12 may be formed using an appropriate material that is chemically stable to the flowing fluid.
A desired surface may be coated with a photocatalytic material such as titanium dioxide, or the entire surface may be formed of the photocatalytic material.
Note that the resistor element 12 and the pipe 11 can be formed of an ultraviolet transmitting material such as quartz glass.

FIG. 5 shows a second modification in which a part of the above embodiment is modified. Here, as in the example shown in FIG. 4 described above, the resistor element 22 is inserted into the pipe 21, but in the resistor element 22, the resistor element 22 is arranged in the circumferential direction along the inner peripheral surface of the pipe 21. Through a plurality of rows of axial columns 23, resistors 24a and 24b forming a pair in a C shape are mutually connected and integrated. Both ends of the support 23 are a pair of annular end plates 25.
Are interconnected. Each resistor 24a, 24b is
The support column 23 is inserted into three mounting holes penetrating the base,
It is fixed in a state of being bridged between three adjacent columns 23.

In FIG. 5, the support 23 is partially omitted, but the length of the support 23, that is, the total length of the resistor element 22 is taken into consideration in terms of manufacturing labor and convenience of handling, the total length of the pipe 21, and the like. The resistors are set to appropriate dimensions, and the same resistors as the resistors 24a and 24b are provided over the entire length in accordance with the same arrangement rules as in the above embodiment. In this case, a total of eight columns 23 are provided at equal intervals in the circumferential direction.
When the resistors are attached one by one, the resistors can be arranged so as to be shifted by 45 degrees in the circumferential direction. In addition, the arrangement angle of the resistor can be adjusted by appropriately increasing or decreasing the number of columns 23 arranged.

With such a configuration, the pipe 21 is formed only of an ultraviolet transmitting material such as quartz glass, and regardless of the material of the resistor element 22, the light from the ultraviolet discharge tube disposed outside the pipe 21 can be obtained. UV rays on pipe 21
It is possible to irradiate the fluid inside. In this case, the resistor element 22 may be formed using an appropriate material that is chemically stable to the flowing fluid.
It is preferable to coat 24b with a photocatalytic material such as titanium dioxide or to form the entirety of the photocatalytic material.

The resistor element 22 includes a support column 23, resistors 24a and 24b, and an end plate 25.
Can be easily manufactured by forming them separately from each other and joining them by welding or the like.
b itself can be formed relatively easily by casting or bending a plate material cut into a predetermined shape. Further, by arranging each of the resistors 24a and 24b between a plurality of columns 23 adjacent to each other, the columns 23 are firmly connected and integrated together with the end plate 25, and the rigidity of the entire resistor element 22 is increased. Therefore, even if the support column 23 is formed to have a relatively small diameter, the resistors 24a and 24b can be stably held, suppressing a decrease in the cross-section of the flow path, and significantly hindering external ultraviolet irradiation. You don't have to.

[0027]

As described above, according to the present invention, it is possible to efficiently irradiate a flowing fluid by agitating action of a resistor even with a short-wavelength ultraviolet light having a large attenuation, thereby disinfecting clean water for food production.・ Use in a wide range of fields such as sterilization treatment, as well as oxidative decomposition treatment of organic substances, organic chlorine compounds, cyanide, and ammonia compounds, and decomposition treatment of hardly decomposable substances such as dioxin, which has become a particular problem in recent years. Becomes possible. In addition, since the stirring effect is obtained by the turbulent flow of the resistor, a remarkable effect is obtained in miniaturizing the device and suppressing an increase in the operating cost, and the device can be used as an energy-saving oxidation reactor having excellent processing capability. . Furthermore, the mixing process by agitation enables the mixing process of a plurality of fluids and the ultraviolet irradiation process to be performed simultaneously and in parallel, and a great effect can be obtained in reducing the installation space and cost.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an ultraviolet irradiation device configured according to the present invention.

FIG. 2 is a front view of the pipe shown in FIG. 1 as viewed from the upstream side.

FIG. 3 is a cross-sectional view showing the pipe shown in FIG.

FIG. 4 is a perspective view showing an example in which the ultraviolet irradiation device shown in FIG. 1 is partially modified.

FIG. 5 is a perspective view showing an example in which the ultraviolet irradiation device shown in FIG. 1 is partially modified.

[Explanation of symbols]

 1a to 1h Resistor 2 Pipe 3 T-tube 4 Control unit 5 Protective glass tube 6.7 UV discharge tube 8 Inlet 9 Outlet 11 Pipe 12 Resistor element 13 Cylindrical body 14a / 14b Resistor 21 Pipe 22 Resistor element 23 Post 24a ・ 24b Resistor 25 End plate

Claims (4)

[Claims] 1. A rod-shaped ultraviolet lamp is coaxially arranged at the center of a pipe through which a fluid to be treated flows, and a plurality of resistors are arranged in a gap between the ultraviolet lamp and the pipe. An ultraviolet irradiation device, characterized in that: 2. The ultraviolet irradiation device according to claim 1, wherein at least a surface portion of said resistor is formed of a photocatalytic material. 3. The pipe according to claim 1, wherein the pipe is formed of an ultraviolet ray transmitting material, and the fluid in the pipe is irradiated with ultraviolet rays from an ultraviolet lamp disposed outside the pipe. The ultraviolet irradiation device according to claim 2. 4. The plurality of resistors are formed in a substantially fan-shaped plate shape narrowing from an outer peripheral side toward a central portion, and are not in contact with each other in a state of being inclined downstream. The ultraviolet irradiation device according to any one of claims 1 to 3, wherein the ultraviolet irradiation device is provided at predetermined intervals in an axial direction and sequentially shifted by a predetermined angle in a circumferential direction of the pipe.