JP2001050692A - Cooling piping facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To clean the inside of a cooling pipeline without stopping an apparatus. SOLUTION: An apparatus having a cooling pipeline 5 is provided with a degassing unit 2 for removing dissolved gas, and an ultrasonic oscillator 3 for clean the inside of the pipeline. The degassing unit 2 previously removes gas dissolved into cooling water and propagation attenuation rate of ultrasonic wave generated from an ultrasonic wave generator comprising an ultrasonic oscillator 3 can be lowered so that the ultrasonic wave can propagate up to the forward end of a long cooling pipeline in an apparatus 4. Consequently, the cooling pipeline in the apparatus can be cleaned entirely. Furthermore, generation of rust or bacteria causing clogging can be suppressed by degassing cooling water through the degassing unit 2 thereby reducing oxygen in the cooling water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cooling piping system for cooling various equipment with cooling water.

[0002]

2. Description of the Related Art In various equipments, cooling water is supplied to equipments in order to maintain the inside of the equipments at a constant temperature or to prevent the temperature from becoming high. Piping is provided. Cooling pipes are often required to be reliable.For example, in nuclear equipment etc., we want to avoid shutting down the equipment as much as possible due to radiation control safety issues.Therefore, ensuring the reliability of cooling pipes in equipment is an important issue. ing. Not only in such nuclear power equipment, but also in various plants and power generation devices, shutting down the device causes enormous economic loss, and similarly, ensuring the reliability of the piping system is an important issue.

As a cooling pipe system using cooling water which is widely used at present, for example, a system as shown in FIG. 5 is used. That is, in the cooling device 50, the inlet 51
The water introduced from the apparatus is cooled to obtain water at a sufficiently low temperature, and the cooling water is introduced into a cooling pipe 54 provided in the apparatus 53 via a pipe 52 to cool the apparatus 53. In the equipment shown in FIG. 5, for example, the cooling water in the cooling pipe is sucked by a pump 55 provided in the pipe coming out of the device 53, and flows the cooling water.
From the outside.

[0004] In addition to the above-described method of discharging the cooling water to the outside, there is also a type in which the cooling water is circulated as shown in FIG. That is, a cooling device 60 that constantly controls the cooling water at a constant temperature is introduced into a cooling pipe 64 provided in the device 63 via a pipe 62 to cool the device 63. The cooling water in the cooling pipe 64 is sucked by a pump 65, pressurized at an outlet side, and introduced into the cooling device 60 again. Thereby, while controlling the temperature of the cooling water, the quality of the cooling water can be easily controlled, and the device 63 can be cooled with high-quality cooling water.

[0005]

SUMMARY OF THE INVENTION In a cooling device provided with a cooling water pipe as described above, in particular, a cooling pipe extending around the device is required to have high reliability. Therefore, by using a high quality material for the cooling pipe and improving the welding method, the reliability is gradually improved, but it cannot be said that it is still sufficient.

Various factors can be considered as factors that impair the reliability. Among them, corrosion is the cause of the occurrence of holes and the like inside the piping, and clogging of the piping due to the generation of bacteria and the like is a major factor. The latter can be solved by inserting a filter, but the amount of water used in the cooling pipe is enormous,
The loss associated with equipment shutdown is large.

[0007] Accordingly, the present invention has been made in view of the above-described circumstances and, in addition to preventing corrosion inside cooling water piping,
It is an object of the present invention to provide a cooling piping system capable of preventing clogging of a pipe due to generation of bacteria and further effectively cleaning the inside of the pipe.

[0008]

In order to solve the above-mentioned problems, the present invention provides a deaerator for removing dissolved gas in a cooling water supply pipe to a cooling pipe, and an ultrasonic vibration for cleaning the inside of the cooling pipe. A cooling pipe facility is constituted by providing a cooling pipe.

[0009] Further, the cooling water supply pipe is provided with an air inlet for introducing a gas for cleaning the inside of the pipe, and the degassing apparatus reduces the dissolved gas amount to 2.5 ppm (mg / l) or less. It has the ability to do.

[0010]

FIG. 1 shows a first embodiment of a cooling piping system according to the present invention, and shows a basic structure of the present invention. In this cooling pipe facility, at least the deaerator 2 and the ultrasonic vibrator 3 are provided in the same channel system as the cooling pipe 5 provided for cooling the inside of the apparatus 4. This flow path system is a circulation type flow path for internally circulating cooling water by a pump 6, similarly to the apparatus shown in FIG. 6, and includes a cooling device 7 for cooling the cooling water to a predetermined temperature. Is provided with a filter 8.

In this flow path system, the evacuation device 9
The dissolved gas in the running water is removed by the deaerator 2 whose inside is evacuated as described later. Next, ultrasonic waves are generated by the ultrasonic vibrator 3 to remove rust generated on the inner surface of the pipe, mold and bacteria generated inside and adhered to the inner surface of the pipe.

As described above, when ultrasonic waves are supplied into water, the dissolved gas in the water dissolves out to generate bubbles, which inhibit the propagation of the ultrasonic waves. However, in the present invention, the deaerator 2 is provided to remove the gas dissolved in the cooling water in advance, and the propagation attenuation of the ultrasonic wave generated by the ultrasonic generator including the ultrasonic vibrator 3 is attenuated. The rate can be reduced, and the ultrasonic waves can be transmitted to the tip of the long cooling pipe in the device 4. In addition, oxygen in the cooling water is reduced by degassing the cooling water by the degassing device,
The generation of rust, mold, bacteria, and the like, which are clogging factors, can be suppressed.

In general, oxygen dissolved in water at 20 ° C. and normal pressure is about 8 ppm and nitrogen is about 15 ppm. If the total amount is reduced to about 2.5 ppm (mg / l), the ultrasonic cleaning ability will be greatly increased. It has been found in an execution test of the present invention that the above-mentioned characteristics are improved. The ultrasonic generator used in the test of the present invention has a frequency of about 100 kHz and an output of about 600 W.
Cleaning is possible even with a pipe of about 0 m. The filter 8 provided in this flow path system is provided for the purpose of collecting rust, mold, bacteria, and the like removed by the above-described ultrasonic cleaning.

The deaerator used in the above device includes:
For example, the fluid circulation deaerator of Japanese Patent No. 2611183 by the present inventors can be used. In this deaerator, a cylindrical gas permeable membrane is provided, the permeable membrane is sealed by a sealed container, and the inside of the sealed container is evacuated by a vacuum exhaust device to a negative pressure. The gas permeable membrane has a hole that does not allow liquid to permeate but allows gas to permeate. Therefore, the fluid passing through the gas permeable membrane first comes into contact with the negative pressure portion via the gas permeable membrane, and the gas dissolved in the pure water is drawn to the gas permeable membrane with a lower partial pressure. The gas dissolved in the membrane and further dissolved in the gas permeable membrane is drawn to the outside of the gas permeable membrane having a lower partial pressure, and is finally discharged to the space on the negative pressure side. However, the deaerator of the present invention is not necessarily limited to the one using the gas permeable membrane shown in the patent, and various known deaerators can be used as long as the dissolved gas can be removed.

Since it is not necessary to constantly perform the above-mentioned ultrasonic cleaning, the ultrasonic vibrator 3 is normally not operated, and it is sufficient to perform the operation intermittently. Other than using one, 45KHz or 2
It is more efficient to use two or three frequencies in combination with a frequency of about 00 KHz. In addition, even in the case where washing is not performed, it is preferable to operate a deaerator in the flowing water system to deaerate the water, so that oxygen that is constantly dissolved in the water can be reduced, and the water quality may be deteriorated. In addition, it is possible to prevent rust, mold, bacteria and the like which are clogging factors.

FIG. 2 shows a second embodiment of the cooling piping system of the present invention.
Is shown in As shown in this embodiment, in the present invention, the flowing water system does not necessarily have to form a circulation system. The cooling water is caused to flow by the pressure of, and is passed through the filter 8, the deaerator 2, the ultrasonic vibrator 3, and the cooling pipe 5 in the device 4, as in the above embodiment.
Discharged from Further, the deaerator 2 is similar to the above embodiment in that the inside of the deaerator 2 is kept at a vacuum by a vacuum exhaust device 9. The cooling piping system configured as described above also operates in the same manner as in the above-described embodiment.

FIG. 3 shows a third embodiment of the cooling piping system of the present invention.
Is shown in This equipment differs from the above embodiments in that a metal ion introduction device 13 is provided.
Generally, when impurities are removed from water, the generation of rust, mold, bacteria, etc. is suppressed, but the inner wall of the metal pipe itself is easily dissolved. As a countermeasure, in this embodiment, a metal ion introducing device is added as described above,
This metal ion introducing device may simply put copper fragments into the inside of the pipe, and a metal having a high ionization tendency is preferable as a metal to be introduced because melting of various kinds of metals can be suppressed.

In addition, using the cooling piping equipment as described above,
Water was circulated at a rate of 1 liter / minute, and the sealed container was evacuated to tens of Torr using an emblem pump as an exhaust pump. As a result, at this flow rate, water in which a saturated amount of 8.1 ppm of oxygen was dissolved was dissolved. Once passed through the gas permeable membrane, the dissolved oxygen content was reduced to 1.2 ppm (equivalent to 2.3 ppm total dissolved gas). In this state, cleaning was tried using a 100 KHz, 600 W throw-in type ultrasonic cleaner, and it was confirmed that the intentionally soiled pipe inner wall at a position about 10 m away was cleaned.

FIG. 4 shows a fourth embodiment of the cooling piping system of the present invention.
Is shown in The basic configuration of this cooling pipe facility is the same as that of the above-described embodiment, except that the ozone generator 1 is provided after the deaerator 2.
5 is provided, and the deaeration device 2 and the intake device 14 constitute a deaeration device 16. This air inlet device 14 is used to clean the inside of the pipe by passing an active gas through the pipe, or to put a specific gas into running water for the purpose of performing surface treatment such as inactivating the inner wall of the pipe. Is provided. In this embodiment, ozone gas is introduced from the ozone generator 15. As the inflow / outflow device 16, the inflow / outflow device of Japanese Patent No. 2611182 by the present inventor can be used.

The permeable membrane serving as the degassing device is as described above. The fluid passing through the gas permeable membrane first comes into contact with the negative pressure portion via the gas permeable membrane, regardless of the type. The gas dissolved therein is degassed. Further, inside the air inlet device, the flowing water comes into contact with the positive pressure portion via the gas permeable membrane. The positive pressure space is filled with ozone created by the ozone generator. The ozone in the positive pressure space is drawn to the gas permeable membrane having a lower partial pressure and dissolves in the membrane, is further drawn into pure water having a lower partial pressure, and finally dissolves in pure water. In the present invention, the deaerator 2
As a result, the gas dissolved in the fluid is in a slight state, so that the gas is easily dissolved. Since ozone has an excellent ability to decompose organic materials, if the cooling pipe is contaminated with organic substances, it can be removed, and efficient cleaning can be expected. However, in the present invention, the air inlet device is not necessarily limited to the one using the gas permeable membrane shown in the above patent, and various air inlet devices can be used as long as a specific gas can be dissolved.

It is not necessary to always perform the above-mentioned cleaning, and it is not necessary to constantly dissolve a gas such as ozone in running water. Normally, when entering the running water, if the temperature rises due to the heat taken inside the device, the gas exceeding the saturation amount will be dissolved and bubbles will be generated, which is dangerous. To be used as a deaerator.

In this embodiment, the cooling piping system has been described. However, the present invention is also effective when it is desired to maintain good cleanliness in the piping, such as the final piping in a semiconductor device manufacturing plant. It can be implemented by simply replacing the part with pure water piping.

[0023]

According to the first aspect of the present invention, by providing an ultrasonic vibrator in a cooling piping system, rust generated in the cooling piping system can be removed, and rust generated on the inner wall can be removed. Mold, bacteria and the like can be removed. At this time, since the gas inside the cooling water has been removed in advance by a deaerator, the generation of bubbles due to the ultrasonic waves generated by the ultrasonic vibrator can be prevented, and the inside of the long cooling pipe can be effectively prevented. Can be washed. Further, by providing a degassing device in the cooling pipe, it is possible to prevent corrosion of the inside of the piping of the cooling water and prevent the generation of bacteria.

According to the second aspect of the present invention, ozone and the like can be introduced into the pipe, and organic substances and the like in the pipe can be removed. In addition, since the degassing device is combined with the degassing device, a specific gas such as ozone can be efficiently supplied to the degassed cooling water. Further, the invention according to claim 3 enhances the cleaning effect by the ultrasonic vibrator as described above by reducing the amount of dissolved gas to 2.5 ppm (mg / l) or less, thereby generating rust, mold, and bacteria. And the like can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a structure and a basic concept of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a structure and a basic concept of a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a structure and a basic concept of a third embodiment of the present invention.

FIG. 4 is an explanatory diagram of a structure and a basic concept of a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram of a conventional technique.

FIG. 6 is an explanatory diagram of another conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling piping equipment 2 Deaerator 3 Ultrasonic oscillator 5 Cooling pipe 6 Pump 7 Cooling device 8 Filter 9 Vacuum exhaust device 11 Water supply port 12 Drain port 13 Metal ion introduction device 14 Inlet device 15 Ozone generator 16 Deaeration apparatus

Claims (3)

[Claims] 1. A cooling pipe facility comprising a deaerator for removing dissolved gas and an ultrasonic vibrator for cleaning the inside of the cooling pipe in a cooling water supply pipe to the cooling pipe. 2. The cooling piping system according to claim 1, further comprising an air intake device for introducing a gas for cleaning the inside of the piping into the cooling water supply pipeline. 3. The degassing device according to claim 1, wherein a dissolved gas amount is 2.5 pp.
3. The cooling piping system according to claim 1 or 2, wherein the cooling piping system has an ability to reduce the temperature to m (mg / l) or less.