JP7069516B2 - Water treatment equipment - Google Patents

Description

The present invention relates to an ultraviolet lamp, particularly a water treatment apparatus using ultraviolet rays using an amalgam lamp.

Conventionally, the configuration of a water treatment device using an ultraviolet lamp filled with mercury is that the lamp is usually installed in an ultraviolet transmissive quartz tube called a jacket or an outer sleeve, and the water to be treated flows to the outside thereof. Ultraviolet rays from the lamp are applied to the water to be treated to perform treatment such as sterilization.
In such a water treatment device, the lamp installed in the quartz tube is affected by the temperature of the water to be treated flowing outside the quartz tube, and the mercury vapor pressure in the lamp fluctuates accordingly, and the irradiation output of ultraviolet rays is emitted. May fluctuate. The fluctuation range of the temperature of the water to be treated such as clean water and sewage varies greatly depending on the region and seasonal fluctuation, and in the case of general clean water, this temperature range is 10 to 30 ° C.
Therefore, when a low-pressure mercury lamp is used as a conventional ultraviolet lamp, the light output having a wavelength of 254 nm becomes 60 to 80% of the peak due to a change in water temperature in this temperature range, which is a drawback of large fluctuation. was there.

In order to make up for this shortcoming, in Japanese Patent Application Laid-Open No. 2011-258321 (Patent Document 1), an amalgam-type low-pressure mercury lamp (hereinafter referred to as an amalgam lamp) in which an amalgam, which is an alloy of mercury and indium, is enclosed in an arc tube is adopted. It is proposed to do.
This amalgam lamp has the advantage that the fluctuation of the mercury vapor pressure is suppressed to be smaller than that of the low-pressure mercury lamp, so that the output fluctuation with respect to the water temperature change is small, but it is also limited to a certain temperature range, as described above. At present, it is not possible to sufficiently cope with the water to be treated having a large temperature change such as 10 to 30 °.

Further, in a water treatment device using an ultraviolet lamp, when the flow velocity of the water to be treated flowing in the device is high, it is radiated from the ultraviolet lamp in order to give a sufficient amount of ultraviolet irradiation to the water to be treated (unit time). The amount of ultraviolet rays (per) must be increased. For that purpose, it is required to increase the amount of input power to the ultraviolet lamp.
However, when an amalgam lamp is used as an ultraviolet lamp, if the input power is increased, the heat generated by the lamp itself increases, and all the amalgam in the reservoir is completely evaporated. Absorption occurs and the amount of emitted light decreases. Moreover, when the temperature of the mercury vapor itself rises as the temperature of the lamp rises, this self-absorption becomes even greater, leading to a further decrease in the amount of emitted light.
As described above, when the input power is increased, the amalgam lamp rises outside the optimum temperature range, and there is a problem that the luminous efficiency of the lamp is lowered.

In particular, since the amalgam lamp is provided with an amalgam reservoir, the reservoir forms the coldest point, and if the temperature deviates from the optimum temperature range due to a temperature change of the water to be treated or the like, There is also a problem that the optimum amount of mercury evaporation cannot be guaranteed and the luminous efficiency is lowered.
Depending on the manufacturing conditions and lighting conditions of the lamp itself, it is possible to keep the coldest point within the optimum temperature range when lighting, but this is also possible when the water temperature is within a certain range, and the water temperature is not constant. In the case of a water treatment device for such water to be treated, such a design becomes difficult.
In recent years, there has been a demand for energy saving in water treatment equipment, so it is desirable to refrain from using electronic cooling equipment such as water cooling equipment, air cooling equipment, and Pelche elements as much as possible.

Japanese Unexamined Patent Publication No. 2011-258321

In view of the above-mentioned problems of the prior art, the present invention is a water treatment using ultraviolet rays having an amal gum lamp as an ultraviolet lamp, a protective tube into which the amal gum lamp is inserted, and a water passage tube into which the protective tube is inserted. In the equipment, even if the temperature of the water to be treated fluctuates due to the installation area and climate change, the water treatment equipment that can keep the coldest point temperature of the Amalgam lamp within the optimum temperature range and maintain the lamp luminous efficiency in a high state. To provide.

In order to solve the above problems, in the water treatment apparatus according to the present invention, the water to be treated is flowed through a water passage formed between the water pipe and the protective pipe, and the temperature of the water treatment device is applied to the amal gum lamp. A temperature measuring device for measuring is provided, and the power supplied to the lamp is controlled according to the measured lamp temperature.
Further, the temperature measuring device is provided at the end of the arc tube of the amalgam lamp.
Further, the amalgam lamp is characterized in that an amalgam storage portion is formed at the end of the arc tube thereof, and the temperature measuring instrument is provided at the end on the side where the amalgam storage portion is formed. And.
Further, the temperature measuring device is provided on the lamp base at the end of the arc tube of the amalgam lamp.
Further, the protective tube is made of quartz glass.

According to the water treatment apparatus according to the present invention, even if the temperature of the water to be treated changes, the temperature of the lamp is adjusted by the control unit adjusting the amount of input power to the lamp according to the temperature measurement result of the Amalgam lamp. It is maintained properly, fluctuations in the mercury vapor pressure in the lamp are suppressed, the irradiation output of ultraviolet rays is stably maintained, and the amount of ultraviolet rays required for the water to be treated can be stably irradiated.
In addition, since the input power is controlled by measuring the temperature at the position corresponding to the amalgam storage section provided at the end of the lamp, the temperature at the amalgam storage section forming the coldest point of the lamp should be set to the optimum temperature range. Can be done.

A side sectional view of the water treatment apparatus of the present invention. An embodiment of the present invention. The control flow of the present invention. The graph which shows the effect of this invention.

FIG. 1 shows a water treatment device using ultraviolet rays of the present invention, and the water treatment device uses an amalgam lamp 1. In the amalgam lamp 1, an amalgam composed of mercury and indium and a rare gas are sealed in a quartz glass arc tube 11. The metal constituting this mercury and amalgam is not limited to indium, but bismuth, tin, lead and the like can also be used.
The pair of electrodes 12 and 12 arranged to face each other in the arc tube 11 are connected to the lamp power supply 13, respectively.
An amalgam storage unit 14 is formed at one end of the arc tube 11, and liquid amalgam is stored in the storage unit 14, and the amalgam evaporates as the light is turned on.
Lamp bases 15 and 15 are attached to both ends of the arc tube 11 of the amalgam lamp 1 by an appropriate means such as an adhesive.

The amalgam lamp 1 is concentrically inserted into a protective tube 2 made of quartz glass and is supported via a lamp base 15. The support and fixing of the amalgam lamp 1 may be, for example, fixing the lamp bases 15 at both ends of the arc tube 11 to the protective tube 2 with an adhesive 16 as shown in FIG.

The protective pipe 2 is concentrically inserted and supported in a water pipe 3 made of stainless steel or the like. A seal member 31 is provided between the water pipe 3 and the protection pipe 2 to make it watertight.
Covers 32, 32 are provided at both ends of the water pipe 3, whereby the water pipe 3 and the protection pipe 2 are positioned and supported.
In this way, an annular water passage 4 is formed between the protection pipe 2 and the water pipe 3.
The water pipe 3 is provided with a water supply port 33 and a drain port 34 in the vicinity of both ends thereof, and water to be treated is supplied and discharged to the water passage 4 through these.

A temperature measuring device 5 such as a thermocouple is attached to the amalgam lamp 1. The temperature measuring instrument 5 may be installed anywhere in the arc tube 11 of the lamp 1, but if it is installed in the center of the arc tube 11, the wiring affects the ultraviolet radiation, and the temperature measuring instrument 5 itself is exposed to ultraviolet rays. Since it may be deteriorated by being irradiated, it is preferable to install it at the end of the arc tube 11, and it may be attached to the lamp base 15. Further, the lamp base 15 may be attached directly to the arc tube 11 itself of the lamp 1 and the lamp base 15 may be attached from above.
In the embodiment of FIG. 1, the temperature measuring device 5 is attached to the end of the arc tube 11 on which the amalgam storage portion 14 is formed.

The temperature measuring device 5 is connected to the lamp power supply 13 via the control unit 17. The control unit 17 controls the lamp power supply 13 so as to control the amount of power input to the amalgam lamp 1 based on the lamp temperature (in this embodiment, the amalgam storage unit 14) measured by the temperature measuring device 5. do.
That is, as shown in the control flow of FIG. 3, when the measured temperature exceeds the upper limit temperature A recorded in the memory of the control unit 17, the control unit 17 determines the amount of electric power input to the amalgam lamp 1. The lamp power supply 13 is controlled so as to reduce the temperature.
Further, the control unit 17 controls the lamp power supply 13 so as to increase the amount of electric power input to the amalgam lamp 1 when the measured temperature falls below the lower limit temperature B recorded in the memory of the control unit 17. ..

Hereinafter, experiments were conducted to demonstrate the effect of the present invention.
An Amalgam lamp set to have a lamp power suitable for a predetermined temperature is prepared, and one lamp is equipped with a mechanism for measuring the temperature and controlling the input power according to the present invention, and the other lamp is provided as a comparative example. Lamps not equipped with such a mechanism were prepared, and the illuminance was measured by changing the temperature of the water to be treated. The result is shown in FIG.
As can be seen in FIG. 4, in the present invention, the predetermined illuminance is maintained regardless of the fluctuation of the water temperature. On the other hand, in the comparative example, the illuminance decreases as the water temperature increases.

As described above, according to the water treatment apparatus using the Amalgam lamp according to the present invention, the temperature of the operating lamp is measured and the input power to the lamp is controlled based on the temperature. Even if the temperature of the water to be treated fluctuates, the temperature of the lamp is kept appropriate, the fluctuation of the mercury vapor pressure in the lamp is suppressed, the irradiation output of ultraviolet rays is stably maintained, and the temperature of the water to be treated is always maintained. It is possible to stably irradiate the required amount of ultraviolet rays.
In addition, by measuring the temperature at the end of the lamp where the amalgam reservoir is provided, the temperature of the amalgam reservoir, which is the coldest point, is kept within an appropriate range, and stable mercury evaporation is performed, resulting in a predetermined mercury vapor. Pressure is obtained and the ultraviolet irradiation output is stably maintained.

1: Amalgam lamp 11: Light emitting tube 12: Electrode 13: Lamp power supply 14: Amalgam storage unit 15: Lamp base 16: Adhesive 17: Control unit 2: Protective tube 3: Water pipe 31: Seal member 32: Cover 33: Water supply port 34: Drain port 4: Water passage 5: Temperature measuring instrument

Claims (5)

A water treatment device using ultraviolet rays having an amalgam lamp having a pair of electrodes arranged to face each other, a protective tube into which the amalgam lamp is inserted, and a water pipe into which the protective tube is inserted.
The water to be treated is flowed through the water passage formed between the water pipe and the protective pipe.
The amalgam lamp is provided with a temperature measuring device for measuring the temperature thereof, and is a water treatment apparatus characterized in that the power supply to the lamp is controlled according to the measured lamp temperature. The water treatment apparatus according to claim 1, wherein the temperature measuring device is provided at an end of an arc tube of the amalgam lamp. The amalgam lamp has an amalgam reservoir formed at the end of the arc tube.
The water treatment apparatus according to claim 2, wherein the temperature measuring device is provided at an end portion on the side where the amalgam storage portion is formed. The water treatment apparatus according to claim 2 or 3, wherein the temperature measuring device is provided on a lamp base at an end of an arc tube of the amalgam lamp. The water treatment apparatus according to any one of claims 1 to 4, wherein the protective tube is made of quartz glass.

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