JP4166794B2 - UV liquid processing equipment - Google Patents

Description

  The present invention relates to an ultraviolet liquid processing apparatus that performs liquid processing such as oxidative decomposition of trace organic substances in a liquid to be processed or decomposition of difficult-to-decompose organic substances by ultraviolet irradiation, and in particular, has been improved in connection with measures against leakage of ozone gas. About things.

  In an ultraviolet liquid processing apparatus that performs processing to reduce organic substances in a liquid to be processed by ultraviolet irradiation, for example, an ultraviolet permeable protective tube (quartz glass tube) is placed in a cylindrical container, and an ultraviolet lamp is placed in the protective tube. The liquid to be treated is passed through the container, and the ultraviolet light emitted from the ultraviolet lamp passes through the protective tube and is irradiated to the liquid to be treated in the container. As the ultraviolet lamp in this case, a low-pressure mercury lamp that emits ultraviolet light having a wavelength of 185 nm is mainly used. The 185 nm light is irradiated to the liquid to be processed outside the tube through the ultraviolet ray transmissive protective tube, thereby reducing organic substances in the liquid to be processed. In addition to low-pressure mercury lamps, there are Nakasho mercury lamps and high-pressure mercury lamps, but organic substances in the liquid can be similarly reduced if the lamp emits ultraviolet light of 220 nm or less.

  Since ultraviolet light having a wavelength of 185 nm has a function of converting oxygen into ozone, in this type of ultraviolet liquid processing apparatus, oxygen in the air around the lamp is changed to ozone. Ozone is a bad odor for human beings, and it is desired to secure less than 0.1 ppm as a working environment. Therefore, a device has been devised to prevent ozone generated around the lamp from leaking out from the ultraviolet liquid processing apparatus. In this type of ultraviolet liquid processing apparatus, one end of the lamp protection tube is exposed at the end of the cylindrical container, and maintenance such as insertion and removal of the ultraviolet lamp into and from the lamp protection tube is performed at this portion. Therefore, an openable and closable cover is formed at the end of the cylindrical container. The cover is opened during maintenance to perform necessary maintenance work, and closed during non-maintenance. I am trying to keep it. Since ozone generated around the lamp leaks from the inside of the protective tube into the cover part, the cover part has an airtight sealing structure when the cover part is closed so that the ozone does not further leak out of the processing apparatus. The device is made to become.

  The cover portion provided at the end of the cylindrical container is configured as liquid nest with respect to the flow path of the liquid to be processed in the container, and basically the liquid in the container does not leak. Yes. However, the liquid in the container may leak into the cover part due to an unexpected situation. In addition, safety measures should be taken in consideration of such unforeseen circumstances. If such liquid leaks into the cover, the sealing structure of the cover for measures against ozone becomes a trap and the leaked liquid accumulates in the cover, causing leakage, lamps, and other electrical / electronic controls. There is a risk of secondary damage such as equipment damage.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an ultraviolet liquid processing apparatus which has been improved in connection with measures against leakage of ozone gas.

  An ultraviolet liquid processing apparatus according to the present invention is a container through which a liquid to be processed is passed, and a translucent lamp protective tube disposed in the container, and is in contact with the liquid to be processed outside the protective tube. An ultraviolet lamp housed in the lamp protection tube, and a portion where one end of the lamp protection tube is exposed from the container, so that the inside can be accessed from one end of the lamp protection tube; A cover part, a drain part for discharging leaked liquid provided at a predetermined position of the cover part, and a valve device for allowing leakage liquid discharge from the cover part in the drain part but preventing gas flow It comprises. As a result, when leakage of the liquid in the container into the cover part occurs, the leaked liquid can be discharged at the drain part, so that the leaked liquid accumulates in the cover part and causes leakage of electric leakage, lamps and other electrical / electronic control devices. There is no risk of secondary damage such as damage. In addition, the valve device provided in the drain portion prevents the ozone gas leaked into the cover portion from leaking from the drain portion to the outside of the processing apparatus, so that measures against ozone gas leakage can be ensured.

  As an example, the valve device may have a valve structure that is normally closed and opened by the pressure of leaking liquid from the cover portion. As another example, the valve device may have a valve structure that is normally closed and opened by buoyancy of leaked liquid accumulated in the cover portion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention in an ultraviolet liquid processing apparatus of the type that performs ultraviolet processing through a liquid to be processed P in a sealed pipe line 1. A pipe line (hereinafter referred to as a sealed pipe for convenience) 1 through which the liquid to be treated P passes is hermetically sealed at both ends by the seal portions 2 and 3, and the liquid to be treated P taken in from the liquid inlet 1a is put into the pipe. And is discharged from the liquid outlet 1b. In the hermetic tube 1, an ultraviolet lamp 5 is disposed in a state of being liquid-tightly inserted in a light-transmitting lamp protection tube 4 made of quartz glass. The ultraviolet lamp 5 emits ultraviolet light having a wavelength of 220 nm or less, typically 185 nm, and exhibits a function of decomposing organic substances in the liquid P to be treated. In FIG. 1, for the sake of simplification of illustration, only one lamp protection tube 4 in which an ultraviolet lamp 5 is housed is provided. As shown in FIG. 3, a plurality of lamp protection tubes 4 (and ultraviolet lamps 5 inside thereof) are provided according to the cross-sectional area of the sealed tube 1.

  Cover portions 6 and 7 provided at both ends of the sealed tube 1 are liquid-tightly blocked from the internal space of the sealed tube 1 through the seal portions 2 and 3 and communicate with the internal space of the lamp protection tube 4. It is in the state. That is, both ends of the lamp protection tube 4 pass through the seal portions 2 and 3 and face the spaces in the cover portions 6 and 7, so that the ultraviolet lamp 5 can be replaced by the end portion of the lamp protection tube 4 at the time of replacement. Can be taken in and out. The cover parts 6 and 7 can be freely opened and closed by a known structure (for example, by opening and closing the lids 6a and 7a). Of course, the cover parts 6 and 7 are opened during maintenance work such as taking in and out the ultraviolet lamp 5 ( The lids 6a and 7a are opened).

  Drain portions 8 and 9 for discharging leaked liquid are provided at predetermined positions below the cover portions 6 and 7. As described above, the cover portions 6 and 7 are configured in a liquid form with respect to the sealed tube 1, and basically, the liquid P in the tube 1 does not leak. However, the liquid P in the pipe 1 may leak into the cover 6 or 7 due to an unexpected situation. In consideration of such an unforeseen situation, the drain portions 8 and 9 are provided, and when leakage of the liquid P in the pipe 1 into the cover portion 6 or 7 occurs, The drain portion 8 or 9 can automatically discharge the water.

  The drain portions 8 and 9 are provided with valve devices 10 and 11 that permit the discharge of leaking liquid from the cover portions 6 and 7 but prevent the flow of gas, respectively. An example of such a valve device 10 is shown in FIG. In the valve device 10 shown in FIG. 2, the outlet 8a of the drain part 8 is normally closed as indicated by reference numeral 10a. However, the leaked liquid from the cover part 6 falls down the drain part 8 and the outlet 8a When it goes to the direction, it has a kind of check valve structure that is opened by the pressure (in the direction of arrow A) as shown by reference numeral 10a '. Although ozone gas generated in the lamp protection tube 4 by ultraviolet rays having a wavelength of 185 nm leaks into the cover portions 6 and 7, the cover portions 6 and 7 are more easily leaked to the outside because of the sealed structure. However, if the drain portions 8 and 9 are provided with the drain portions 8 and 9, if the drain portions 8 and 9 are always open, ozone gas leaks from the drain portions 8 and 9, which is not preferable. In this regard, according to the present invention, in the valve device 10 shown in FIG. 2, the valve at the closed position 10 a has a structure that prevents the flow of gas, so that leakage of ozone gas from the drain portion 8 is prevented. That is, since the gas is much lighter than the liquid, the valve at the closed position 10a is not moved in the direction of arrow A depending on the gas.

  FIG. 3 shows an example of another valve structure of the valve device 10. The valve device 10 shown in FIG. 3 is configured by a floating ball 10b that is arranged so as to normally close the outlet 8a of the drain portion 8. When the leaked liquid accumulates to some extent in the liquid storage space 8b of the drain portion 8, the floating ball 10b is pushed up by buoyancy, and the outlet 8a is opened, whereby the leaked liquid is discharged from the outlet 8a to the outside. On the other hand, when the leaked liquid does not accumulate in the liquid storage space 8b of the drain part 8, the floating ball 10b closes the outlet 8a, so that the ozone gas is prevented from leaking outside from the drain part 8.

  2 and 3 are schematic end views of the cover unit 6 viewed in the axial direction of the longitudinal ultraviolet lamp 5 with the cover 6a of the cover unit 6 being removed. One end of the ultraviolet lamp 5 inserted therein is shown. In the seal gland 12 that fixes the lamp protection tube 4 in the hole formed in the wall surface of the seal portion 2, the liquid nectar is sealed, but there is a possibility that unexpected liquid leakage may occur from this portion. In addition, unexpected liquid leakage may occur from any part of the seal portion 2.

The valve structure of the valve device 10 is not limited to that shown in FIGS. 2 and 3 and may be any structure as long as the object of the present invention can be achieved.
In the said Example, although the cover parts 6 and 7 are provided in the both ends of the sealed tube 1, it may be a design provided only in one end. Further, any configuration or structure of the cover portions 6 and 7 may be used.
Furthermore, the container through which the liquid P to be processed passes is not limited to the sealed tube 1, that is, the cylindrical container, and may have any structure. In that case, the cover portion can be accessed from one end of the lamp protection tube 4 at a portion where one end of the lamp protection tube 4 disposed in the container is exposed to the outside from the wall of the container. Provided. And in such a cover part, the drain part and valve apparatus according to this invention should just be provided.

1 is a schematic side sectional view showing an embodiment of the present invention in an ultraviolet liquid processing apparatus of a type in which a liquid to be processed is passed through a pipe line. The end view of the cover part which shows an example of the valve apparatus in the Example. The end view of the cover part which shows another example of the valve apparatus in the Example.

Explanation of symbols

1 pipeline (sealed tube)
DESCRIPTION OF SYMBOLS 1a Liquid inlet 1b Liquid outlet 2,3 Seal part 4 Lamp protection tube 5 Ultraviolet lamp 6,7 Cover part 8,9 Drain part 10,11 Valve apparatus

Claims (6)

A container through which the liquid to be treated is passed;
A translucent lamp protective tube disposed in the container, which is in contact with the liquid to be treated outside the protective tube;
An ultraviolet lamp housed in the lamp protection tube;
An openable and closable cover portion provided so that one end of the lamp protection tube is exposed from the container, and the inside of the lamp protection tube can be accessed from one end
A drain part for discharging leaked liquid provided at a predetermined position of the cover part;
An ultraviolet liquid processing apparatus comprising: a valve device that allows leakage liquid to be discharged from the cover portion but prevents gas from flowing in the drain portion.   The ultraviolet liquid processing apparatus according to claim 1, wherein the valve device is normally closed and has a valve structure that is opened by a pressure of leaked liquid from the cover portion.   2. The ultraviolet liquid processing apparatus according to claim 1, wherein the valve device is normally closed and has a valve structure that is opened by a buoyancy of leaked liquid accumulated in the cover portion.   The ultraviolet liquid processing apparatus according to any one of claims 1 to 3, wherein the container is formed of a sealed pipe line, and the cover portion is provided on one end side of the pipe line.   The ultraviolet liquid processing apparatus according to claim 1, wherein a plurality of the lamp protection tubes are arranged in the container.   The ultraviolet liquid processing apparatus according to claim 1, wherein the ultraviolet lamp is capable of emitting ultraviolet light having a wavelength of 220 nm or less.

Images