JP2010274173A - Uv ray irradiation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make service life of a high pressure UV ray lamp while acquiring radiation near a wavelength of 254 nm with high efficiency in the high pressure UV ray lamp. <P>SOLUTION: The high pressure UV ray lamp 12 is arranged in a box-shaped lamp house 11 at a part of which an opening 14 is formed and generated UV rays are radiated from the opening 14. The UV rays radiated from the high pressure UV ray lamp 12 to the opposite side of the opening 14 is reflected by a reflector 13 and then is radiated from the opening 14. A window part 15c is formed at a position facing the opening 14 of the lamp house 11 and a treatment container 15 in the inside of which a treatment part 16 where water to be treated can flow in or flow out is formed, is irradiated with the UV rays via a UV ray transmission material 19 arranged at the window part 15c and made of quartz glass which transmits the UV rays. Lamp temperature of the high pressure UV ray lamp 12 is driven within a range of 550 to 650°C. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an ultraviolet irradiation apparatus that performs water treatment such as sterilization, inactivation, and organic matter decomposition using a high-pressure ultraviolet lamp.

  The conventional UV irradiation device is heated by the heat generated by the high-pressure UV lamp during light emission. Therefore, in order to suppress this temperature, a double-tube water-cooling system in which an outer tube is provided outside the inner tube containing the high-pressure UV lamp. A jacket is provided, and the temperature rise is suppressed by flowing the coolant through the water-cooled jacket. (For example, Patent Document 1)

JP 2008-226806 A

  The technique disclosed in Patent Document 1 is intended for a high-pressure ultraviolet lamp in which mercury having a main wavelength of 300 to 430 nm or a metal element containing mercury is sealed. In the cooling structure shown here, the inner tube is cooled with water. However, since the lamp is indirectly cooled by cooling the gas around the lamp, the cooling capacity is limited and the temperature of the arc tube is at most about 750 ° C., and the luminous efficiency decreases due to the high temperature. Was inevitable. Further, the increase in lamp temperature accelerates devitrification and blackening of quartz and shortens the lamp life. Furthermore, since it is necessary to arrange a high-pressure ultraviolet lamp inside the double-pipe structure, maintainability such as lamp replacement has also been reduced.

  An object of the present invention is to provide an ultraviolet irradiation device capable of extending the life of a high-pressure ultraviolet lamp while obtaining a high luminous efficiency of a sterilization line of 254 nm in the high-pressure ultraviolet lamp.

  In order to solve the above-described problems, an ultraviolet irradiation device of the present invention includes a high-pressure ultraviolet lamp in which mercury or a metal element containing mercury is enclosed, a lighting device for lighting the high-pressure ultraviolet lamp, and the high-pressure ultraviolet lamp. A lamp house in which an opening capable of irradiating ultraviolet light is formed, a cooling mechanism capable of lowering the temperature in the lamp house and lowering the lamp temperature of the high-pressure ultraviolet lamp, and the lamp house A window portion is formed at a position opposite to the opening portion, and an ultraviolet light transmitting material that transmits the ultraviolet light is disposed through the window portion, so that water to be treated formed therein can flow in and out. A high-pressure ultraviolet lamp having a lamp temperature controlled within a range of 550 to 650 degrees.

  The ultraviolet irradiation device of the present invention houses an electrodeless high-pressure ultraviolet lamp in which a discharge medium that emits ultraviolet light is sealed based on the microwave of a magnetron that generates microwaves, and the high-pressure ultraviolet lamp. A lamp house in which an opening capable of irradiating ultraviolet light is formed; an RF screen disposed in the opening of the lamp house to shield the microwave; and a temperature in the lamp house is lowered to reduce the temperature in the lamp house. A cooling mechanism capable of lowering the lamp temperature, and a window portion is formed at a position facing the opening of the lamp house, and an ultraviolet ray transmitting material that transmits the ultraviolet ray through the window portion is disposed. And a treatment vessel having a treatment part formed therein, into which treated water can flow in and out, and a lamp temperature of the high-pressure ultraviolet lamp. It is characterized in that controlled in the range of 550 to 650 degrees.

  According to the present invention, it is possible to improve the luminous efficiency of ultraviolet rays necessary for water treatment while improving the life of the lamp.

It is a perspective view for demonstrating the notional structure of one Embodiment regarding the ultraviolet-ray processing apparatus of this invention. It is a sectional side view of FIG. FIG. 3 is a side sectional view taken along line I-I ′ of FIG. 2. It is explanatory drawing for demonstrating the effect of this invention. It is a side view for demonstrating the notional structure of other embodiment regarding the ultraviolet-ray processing apparatus of this invention. FIG. 6 is a side sectional view taken along line II-II ′ of FIG. 5. It is a block diagram for demonstrating an example of the electrodeless lamp used for FIG.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  1 to 3 are diagrams for explaining an embodiment of the ultraviolet irradiation apparatus of the present invention. FIG. 1 is a perspective view showing a conceptual configuration, FIG. 2 is a sectional view of FIG. 1, and FIG. It is II 'line sectional drawing.

  1-3, 100 is an ultraviolet irradiation device comprised from the lamp house 11 and the process container 15 which irradiate ultraviolet rays, for example to tap water, and perform a sterilization process. The lamp house 11 is formed in a box shape in which an opening 14 is provided on the side close to the lower surface. In the lamp house 11, for example, an electroded long arc high-pressure ultraviolet lamp 12 having a main wavelength of 300 to 430 nm and capable of emitting ultraviolet light near 254 nm is disposed. A reflector 13 is disposed at a position facing the opening 14, and reflects ultraviolet rays from the high-pressure ultraviolet lamp 12 radiated to the opposite side of the opening 14 to the opening 14. Between the reflector 13 and the lamp house 11, an air circulation part is formed by a space or the like, and the non-reflective surface side and the reflective surface side of the reflector 13 are configured to facilitate air flow.

  Reference numeral 15 denotes a processing vessel made of corrosion resistant, for example, stainless steel. The processing container 15 has a triangular prism at the top and a processing unit 16 is formed in the internal space. A water supply port 17 is formed on one side surface of the processing vessel 15 that forms a triangular prism. On the other side surface forming the triangle of the triangular prism, a drain outlet 18 for feeding water treated by the treatment unit 16 is formed. A pipe that feeds water to be treated (not shown) is attached to the water supply port 17, and a pipe that sends out treated water that has been processed by the processing unit 16 (not shown) is attached to the drain port 18.

  By the way, the water supply port 17 is formed on the side near the bottom 15 a of the processing container 15, and the drain port 18 is formed on the side near the upper part 15 b of the processing container 15. As a result, the water to be treated taken into the water supply port 17 passes through both the deep position and the shallow position and is sent out from the drain port 18.

  A window 15c having a size that fits the opening 14 of the lamp house 11 is formed at a portion corresponding to the side of the processing container 15 that faces the apex of the triangular prism. An ultraviolet transmissive material 19 made of, for example, quartz glass having an ultraviolet transmissive function is attached to the window portion 15c. The processing unit 16 can be irradiated with ultraviolet rays from the high-pressure ultraviolet lamp 12 through the ultraviolet transmissive material 19.

  Reference numeral 20 denotes a temperature sensor for detecting the temperature of the high-pressure ultraviolet lamp 12. The temperature information detected by the temperature sensor 20 is supplied to a control unit 21 constituted by a microcomputer or the like, and determines whether or not the temperature is set in advance. The control unit 21 drives the blower 22 based on the set temperature, and performs control to send air, which is a cooling medium, to the intake port 24 installed on the upper surface of the lamp house 11 via the duct 23. 11 is taken in. Note that the temperature sensor 20 does not have to directly detect the heat radiated from the lamp. For example, paying attention to the fact that the temperature in the lamp house rises and falls according to the rise and fall of the lamp temperature, The relative lamp temperature may be detected by detecting the temperature of the member. The cooling control can be realized by using a blower capable of adjusting the displacement by increasing or decreasing the drive frequency and controlling the drive frequency of the blower based on the temperature information detected by the temperature sensor 10.

  The air taken into the lamp house 11 from the intake port 24 is applied to the high-pressure ultraviolet lamp 12 through a circulation part between the lamp house 11 and the reflector 13 to constitute a cooling mechanism that lowers the lamp temperature.

  In the ultraviolet irradiation device configured in this way, the ultraviolet rays emitted from the high-pressure ultraviolet lamp 12 are directly reflected by the reflector 13 through the ultraviolet ray transmitting material 19 and reflected by the reflector 13. Depending on the amount irradiated to the processing unit 16, the processing unit 16 is irradiated with ultraviolet rays to be treated water taken from the water supply port 17.

  By the way, if the temperature of the high-pressure ultraviolet lamp 12 is within a preset range of, for example, 550 to 650 degrees, the control unit 21 controls the air blowing into the lamp house 11 with the drive frequency of the blower 22 kept constant. When the control unit 21 detects that the temperature of the high-pressure ultraviolet lamp 12 exceeds 650 degrees, the driving frequency of the blower 22 is increased to cool the inside of the lamp house 11 and the temperature of the high-pressure ultraviolet lamp 12 is increased. Control is performed to be 650 degrees or less. If the angle is less than 550 degrees, control is performed to reduce the drive frequency of the blower 22.

  The control of the blower 22 when the temperature of the high-pressure ultraviolet lamp 12 is in the range of 550 to 650 degrees is not made to be completely constant, but is repeatedly driven and stopped to reach, for example, an intermediate temperature of 550 to 650 degrees. Such control may be performed.

Here, with reference to FIG. 4, the relationship with the luminous efficiency with respect to the lamp temperature in a different wavelength range is demonstrated. FIG. 4 shows the relationship between the lamp temperature and luminous efficiency of 240 to 270 nm, 310 to 380 nm, and 340 to 470 nm in the same high-pressure ultraviolet lamp. The luminous efficiency η is a value obtained by dividing the illuminance value [unit: mW / cm ² ] measured under a predetermined condition (distance / illuminance meter) by the input power [W] to the high-pressure ultraviolet lamp.

  When living organisms are irradiated with ultraviolet rays around 254 nm, adjacent pyrimidine bases in deoxyribonucleic acid (DNA), which controls genetic information, in particular, thymidine bases are photocrosslinked to dimerize, so that gene expression and DNA replication may occur. (For example, Shigeru Ando et al. (1994 “Sewage and drainage disinfection by ultraviolet rays” for water and drainage, Vol. 36, No. 6, page 27, etc.) 310-380 nm) It is known that organisms damaged on DNA with a high pressure UV lamp of 340 to 470 nm are alleviated and recovered when exposed to visible or near UV light of 300 to 600 nm (for example, “ Biochemistry Dictionary, Tokyo Kagaku Doujin, Koji Kashimada et al. (1995) “Evaluation of Photorecovery in Ultraviolet Irradiated Water Treatment” Journal of Water Environment Society, Vol. 18, No. 1 P. 44).

  Therefore, in a high-pressure ultraviolet lamp having a main wavelength in the range of wavelengths of 310 to 380 nm and 340 to 470 nm, the luminous efficiency improves as the temperature increases, but it is not practically used as a high-pressure ultraviolet lamp for water treatment. .

  In such a lamp, in order to suppress the light emission of wavelengths 310 to 380 nm and 340 to 470 nm and to maximize the light emission efficiency of 240 to 270 nm wavelength which is relatively satisfied as an ultraviolet ray for water treatment, 550 to 650 as shown in FIG. The degree was limited to the lamp temperature. Thereby, it is possible to realize ultraviolet irradiation suitable for water treatment while obtaining high luminous efficiency.

  In this embodiment, since the high-pressure ultraviolet lamp is arranged outside the processing vessel, it is suitable for water treatment by managing the lamp temperature in the range of 550 to 650 degrees while improving the maintenance property of the lamp replacement. It becomes possible to light a high-pressure ultraviolet lamp having a wavelength near 254 nm under a state of high luminous efficiency.

  Further, by reducing the lamp temperature, it is possible to reduce the load on the high-pressure ultraviolet lamp. For this reason, even a high-pressure ultraviolet lamp can achieve a long life.

  In this embodiment, the temperature of the lamp is adjusted by blowing air into the lamp house. However, an exhaust port may be installed to exhaust the heat in the lamp house. Further, intake and exhaust functions may be installed.

  5 to 7 are diagrams for explaining a conceptual configuration of another embodiment relating to the ultraviolet ray processing apparatus of the present invention. FIG. 5 is a side view, and FIG. 6 is a side sectional view taken along line II-II ′ of FIG. FIG. 7 is a block diagram for explaining an example of the electrodeless lamp used in FIG. In this embodiment, an electrodeless high-pressure ultraviolet lamp that emits light having a wavelength of about 254 nm is used. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and different parts will be described here.

  That is, a so-called electrodeless lamp 51, which is not provided with an electrode, is attached to a part of the side surface of the lamp house 11. Reference numeral 52 denotes a magnetron that generates a microwave of 2.45 GHz, for example, and power is supplied to the magnetron 52 from a power supply 53. Reference numeral 54 denotes a waveguide for transmitting the microwave generated by the magnetron 52 from the antenna 55 and transmitting it to the electrodeless lamp 51.

  Here, a configuration example of the electrodeless lamp 51 will be described with reference to FIG. Reference numeral 511 denotes a cylindrical bulb having a length of about 240 mm made of quartz glass that transmits ultraviolet light. The valve 511 is formed by attaching a taper so that the central portion 512 is thinner than both end portions 513, 514. The outer diameter of both end portions 513, 514 is about 17 mm, for example, and the outer diameter of the central portion 512 is 10 mm. Degree. An inert gas and a discharge medium such as mercury or iron are enclosed in the light emitting space 515 of the bulb 511. Support portions 516 and 517 that support the valve 511 are formed integrally with the valve 511 at both ends of the valve 511. The electrodeless lamp 51 can emit light from a discharge medium that generates ultraviolet light near 254 nm enclosed in a bulb 511 by irradiating it with microwaves.

  5 and 6 again, on the back side of the electrodeless lamp 51, reflectors 131 and 132 for collecting or diffusing the irradiated ultraviolet light are installed. Further, an RF screen 56 constituting an irradiation window is provided in a part of the lamp house 11 on the front surface of the reflection plates 131 and 132. The reflectors 131 and 132 are arranged with a gap therebetween, and microwaves are supplied to the electrodeless lamp 51 from this gap.

  The RF screen 56 is made of metal and has an opening, blocks microwaves, and allows ultraviolet light and air to pass through. For example, the RF screen 56 is formed by braiding metal wires into a mesh shape or by punching a metal plate to have an opening.

  The opposite surface of the RF screen 56 facing the electrodeless lamp 51 is an ultraviolet irradiation surface 57.

  58 is an exhaust duct arranged in close contact with the lower portion of the lamp house 11. The duct 58 has a box-like shape, and openings 581 and 582 having the same shape and the same size as the RF screen 56 are respectively formed on the upper surface plate and the lower surface plate where the RF screen 56 is located. Further, the duct 58 is formed with an exhaust port 584 through a vent hole 583.

  The magnetron 52 and the electrodeless lamp 51 blow air from the blower 22 for blowing into the air inlet 24 and the lamp house 11, and exhaust and cool the air through the air outlet 584 of the duct 58. The series of air flows is a cooling mechanism. Is configured.

  Here, when the magnetron 52 is driven, air is blown from the blower 22 and is taken into the lamp house 11 through the intake port 24. The taken-in air is exhausted from the exhaust port 584 of the duct 58 via the magnetron 52, the electrodeless lamp 51, the RF screen 56, and the duct 58, as indicated by the wavy arrow in FIG.

  At this time, the electrodeless lamp 51 excited by the microwave of the magnetron 52 emits ultraviolet light having a wavelength of about 254 nm, and treats the water to be treated supplied into the processing container 15 through the RF screen 56 and the ultraviolet transmitting material 19. , And sent to the drain port 18.

  Also in this embodiment, it is possible to obtain ultraviolet light with high luminous efficiency by performing temperature control on an electrodeless high-pressure ultraviolet lamp that emits ultraviolet light of around 254 nm. Further, since the high-pressure ultraviolet lamp is cooled outside the processing vessel through which the water to be treated passes, the maintenance performance is also good.

  Although the magnetron used in this embodiment is installed in the lamp house, it may be installed outside the lamp house and take a microwave into the lamp house. In this case, since the lamp house is not affected by the heat generated from the magnetron, the lamp temperature can be easily controlled.

  Further, as a method of setting a temperature range of 550 to 650 ° C., in which a UV light of 240 to 270 nm is obtained with high luminous efficiency in a high-pressure ultraviolet lamp, in addition to controlling increase / decrease of at least one of the intake air amount and the exhaust air amount of the cooling mechanism Based on the temperature detection result of the high-pressure ultraviolet lamp, the power source may be controlled from the control unit to increase or decrease the input power to the high-pressure ultraviolet lamp.

DESCRIPTION OF SYMBOLS 100 Ultraviolet irradiation apparatus 11 Lamp house 12 High pressure ultraviolet lamp 13 Reflector 15 Processing container 16 Processing part 17 Water supply port 18 Drainage port 19 Ultraviolet transparent material 20 Temperature sensor 21 Control part 22 Blower 23,58 Duct 24 Inlet 51 Electrodeless lamp 52 Magnetron 54 Waveguide 584 Exhaust port

Claims (5)

A high-pressure ultraviolet lamp enclosing mercury or a metal element containing mercury;
A lighting device for lighting the high-pressure ultraviolet lamp;
A lamp house in which the high-pressure ultraviolet lamp is housed and an opening capable of irradiating ultraviolet light to the outside is formed;
A cooling mechanism capable of lowering the temperature in the lamp house and lowering the lamp temperature of the high-pressure ultraviolet lamp;
A window portion is formed at a position opposite to the opening of the lamp house, and an ultraviolet light transmitting material that transmits the ultraviolet light is disposed through the window portion, so that water to be treated formed therein flows in and out. A processing container in which a possible processing unit is formed,
The ultraviolet processing apparatus according to claim 1, wherein a lamp temperature of the high-pressure ultraviolet lamp is controlled within a range of 550 to 650 degrees. An electrodeless high-pressure ultraviolet lamp in which a discharge medium that emits ultraviolet rays is enclosed, based on the microwave of a magnetron that generates microwaves,
A lamp house in which the high-pressure ultraviolet lamp is housed and an opening capable of irradiating ultraviolet light to the outside is formed;
An RF screen arranged at the opening of the lamp house to shield the microwave;
A cooling mechanism capable of lowering the temperature in the lamp house and lowering the lamp temperature of the high-pressure ultraviolet lamp;
A window portion is formed at a position opposite to the opening of the lamp house, and an ultraviolet light transmitting material that transmits the ultraviolet light is disposed through the window portion, so that water to be treated formed therein flows in and out. A processing container in which a possible processing unit is formed,
The ultraviolet processing apparatus according to claim 1, wherein a lamp temperature of the high-pressure ultraviolet lamp is controlled within a range of 550 to 650 degrees.   3. The ultraviolet processing apparatus according to claim 1, wherein the high-pressure ultraviolet lamp has a wavelength of 240 to 270 nm.   The ultraviolet processing apparatus according to claim 1, wherein the cooling mechanism cools the high-pressure ultraviolet lamp by performing at least one of intake and exhaust in the lamp house.   5. The ultraviolet processing apparatus according to any one of claims 1 to 4, wherein the cooling mechanism is used in combination with increase / decrease in input power for lighting the high-pressure ultraviolet lamp.

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