JP3505554B2 - Cooling piping equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling pipe facility for cooling various equipment facilities with cooling water. 2. Description of the Related Art In various equipment facilities, cooling water is supplied to equipment equipment in order to keep the inside at a constant temperature or prevent it from becoming a high temperature, and supply the cooling water. A cooling pipe is provided. Cooling pipes are often required to be reliable. For example, in nuclear power equipment, it is desirable to avoid shutting down the equipment as much as possible due to safety issues in radiation management. Therefore, ensuring the reliability of cooling pipes in equipment is an important issue. ing. Not only in such nuclear equipment, but also in various plants and power generators, stopping the equipment causes enormous economic loss, so ensuring the reliability of the piping system is also an important issue. As a cooling pipe facility using cooling water that is widely used at present, for example, a facility as shown in FIG. 5 is used. That is, the inlet 51 in the cooling device 50.
The water introduced from above is cooled to secure water at a sufficiently cold temperature, and this cooling water is introduced into the cooling pipe 54 provided in the apparatus 53 via the pipe 52 to cool the apparatus 53. For example, in the facility shown in FIG. 5, such cooling water in the cooling pipe is sucked by the pump 55 provided in the pipe coming out from the apparatus 53 to flow the cooling water, and the discharge port 56.
Is discharged to the outside. In addition to discharging the cooling water to the outside as described above, for example, there is a circulating type as shown in FIG. That is, the cooling device 60 that always controls the cooling water to a constant temperature is used, and the cooling water is introduced into the cooling pipe 64 provided in the device 63 via the pipe 62 to cool the device 63. The cooling water in the cooling pipe 64 is sucked by the pump 65, pressurized at the outlet side, and introduced into the cooling device 60 again. Thus, the temperature of the cooling water is managed, the quality of the cooling water can be easily managed, and the apparatus 63 can be cooled with high-quality cooling water. [0005] In the cooling device provided with the cooling water pipe as described above, the cooling pipe stretched around the device is particularly required to be reliable. Therefore, by using a high quality material for this cooling pipe and improving the welding technique, the reliability is gradually increased, but it cannot be said that it is still sufficient. Various factors can be considered as factors that impair the reliability. Among them, the inside of the pipe is corroded to cause holes and the like, and the generation of bacteria and the like is a major factor. The latter can be temporarily eliminated by inserting a filter, but the amount of water used in the cooling pipe is enormous.
The loss due to equipment shutdown is large. Therefore, in view of the above situation, the present invention prevents corrosion inside the piping of cooling water,
It is an object of the present invention to provide a cooling pipe facility that can prevent clogging of a pipe due to generation of bacteria and can effectively clean the inside of the pipe. In order to solve the above-mentioned problems, the present invention provides a cooling pipe facility provided with an ultrasonic vibrator for cleaning the inside of the cooling pipe in the cooling water supply pipe to the cooling pipe. A degassing device for removing dissolved gas is provided in the cooling water supply pipe, and the degassing device prevents the generation of bubbles due to ultrasonic vibration, and the ultrasonic wave in the cooling water by the ultrasonic vibrator The cooling piping facility is configured by increasing the transmission distance of the. FIG. 1 shows a first embodiment of a cooling pipe installation according to the present invention and shows the basic structure of the present invention. In this cooling piping facility, at least the deaeration device 2 and the ultrasonic vibrator 3 are provided in the same flow path system as the cooling piping 5 provided for cooling the inside of the device 4. Similar to the apparatus shown in FIG. 6, this flow path system is a circulation flow path in which cooling water is internally circulated by a pump 6, and includes a cooling device 7 for cooling the cooling water to a predetermined temperature, and further upstream of the pump 6. A filter 8 is provided. In this flow path system, a vacuum exhaust device 9 is provided.
As will be described later, the dissolved gas in the running water is removed by the degassing device 2 whose inside is evacuated. Next, ultrasonic waves are generated by the ultrasonic vibrator 3 to remove rust generated on the inner surface of the pipe, soot, bacteria, etc. generated inside and attached to the inner surface of the pipe. As described above, when ultrasonic waves are supplied into water, dissolved gas in the water dissolves to generate bubbles, which inhibit the propagation of ultrasonic waves. However, in the present invention, the deaeration device 2 is provided to remove the gas previously dissolved in the cooling water, and the propagation attenuation of the ultrasonic wave generated by the ultrasonic wave generator provided with the ultrasonic vibrator 3 is reduced. The rate can be lowered, and the ultrasonic wave can be propagated to the end of a long cooling pipe in the apparatus 4. In addition, the oxygen in the cooling water is reduced by the deaeration in the cooling water by the deaeration device,
Occurrence of clogging factors such as rust, soot and bacteria can be suppressed. In general, oxygen dissolved in water at 20 ° C. and atmospheric pressure is about 8 ppm and nitrogen is about 15 ppm. If this total amount is lowered to about 2.5 ppm (mg / l), the ultrasonic cleaning ability is greatly improved. It has been proved by an implementation test of the present invention that 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.
It is possible to clean even about 0m of piping. The filter 8 provided in this flow path system is provided for the purpose of collecting rust, soot, bacteria, etc. removed by the above-described ultrasonic cleaning. As a deaeration device used in the above apparatus,
For example, the fluid circulation deaerator of Japanese Patent No. 2611183 by the present inventors can be used. In this deaeration device, a cylindrical gas permeable membrane is provided, and the permeable membrane is sealed by a sealed container, and the inside of the sealed container is evacuated by a vacuum evacuation device to have a negative pressure. The gas permeable membrane does not allow liquid to permeate, but has a hole that 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 having 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 finally discharged to the space on the negative pressure side. However, the degassing device of the present invention is not necessarily limited to the one using the gas permeable membrane shown in the above patent, and various known degassing devices can be used as long as the dissolved gas can be removed. Since the above-described ultrasonic cleaning does not need to be performed at all times, the ultrasonic transducer 3 is normally not operated, and intermittent operation is sufficient. The frequency used is about 100 kHz. Besides using one, 45KHz and 2
It is more efficient to use two to three frequencies combined with a frequency of about 00 KHz. Even when washing is not performed, it is preferable to deaerate by operating a deaerator in a running water system, so that oxygen dissolved in the water at all times can be reduced and water quality deteriorated. It is possible to prevent the occurrence of clogging factors such as rust, soot and bacteria. FIG. 2 shows a second embodiment of the cooling pipe facility of the present invention.
It shows. As shown in this embodiment, according to the present invention, the flowing water system does not necessarily form a circulation system, and the water is guided to the water inlet 11 directly from a water pipe or after passing through a cooling device. In the same manner as in the previous embodiment, the cooling water is flowed through the filter 8, the deaerator 2, and the ultrasonic vibrator 3, and led to the cooling pipe 5 in the device 4.
To discharge from. Further, the deaeration device 2 is the same as the above embodiment in that the inside of the deaeration device 2 is kept in vacuum by the vacuum exhaust device 9. The cooling piping equipment configured as described above operates in the same manner as in the above embodiment. FIG. 3 shows a third embodiment of the cooling pipe facility of the present invention.
It shows. This facility differs from the above embodiments in that a metal ion introduction device 13 is provided.
Generally, when impurities are removed from the water, the generation of rust, soot, bacteria, etc. can be suppressed, but the inner wall of the metal pipe itself is likely to melt. As a countermeasure, in this embodiment, a metal ion introduction device is added as described above,
As this metal ion introducing device, it is sufficient to simply put a piece of copper into the pipe, and as the metal to be introduced, a metal having a strong ionization tendency is preferable because it can suppress the melting of many kinds of metals. In addition, using the cooling piping equipment as described above,
The water was circulated at a rate of 1 liter / min, and the sealed container was evacuated to several tens of Torr using an emblem pump as an exhaust pump. As a result, at this flow rate, water in which 8.1 ppm of oxygen as a saturation amount was dissolved was dissolved. Once passed through the gas permeable membrane, the amount of dissolved oxygen was reduced to 1.2 ppm (equivalent to a total amount of dissolved gas of 2.3 ppm). In this state, cleaning was tried using a throwing ultrasonic cleaner of 100 KHz and 600 W, 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 pipe facility according to the present invention.
It shows. The basic configuration of this cooling pipe facility is the same as that of the above embodiment, but the ozone generator 1 is provided after the deaerator 2.
The deaeration device 16 is configured by the deaeration device 2 and the intake device 14. This air inlet device 14 is used for putting a specific gas into running water for the purpose of passing an active gas through the pipe to clean the inside of the pipe or to inactivate the inner wall of the pipe. Provided. In this embodiment, ozone gas is introduced from the ozone generator 15. As the deaeration device 16, the deaeration device of Japanese Patent No. 2611182 by the present inventor can be used. The permeable membrane serving as the deaeration device is as described above, and the fluid passing through the gas permeable membrane first comes into contact with the negative pressure portion through the gas permeable membrane, and the fluid regardless of the type. The gas dissolved therein is degassed. Furthermore, inside the air inlet device, the flowing water comes into contact with the positive pressure portion through the gas permeable membrane. The positive pressure space is filled with ozone produced by an ozone generator. The ozone in the positive pressure space is drawn to the gas permeable membrane having a lower partial pressure and dissolved in the membrane, further drawn into the pure water having a lower partial pressure, and finally dissolved in the pure water. In the present invention, the deaeration device 2
Since the gas dissolved in the fluid is in a slight state, 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 inlet device is not necessarily limited to the one using the gas permeable membrane shown in the above patent, and various inlet devices can be used as long as a specific gas can be dissolved. It is not necessary to perform the above-described cleaning at all times, and it is not necessary to constantly dissolve a gas such as ozone in running water. Normally, the intake air into the running water is dangerous because it takes heat inside the device and the temperature rises, the gas exceeding the saturation amount melts and bubbles are generated, and the intake portion is usually evacuated. It is desirable to use as a deaeration device. In the present embodiment, the cooling pipe system has been described. However, the present invention is also effective when it is desired to maintain a good cleanliness in the pipe as in the final pipe of the semiconductor device manufacturing factory. This can be done by simply replacing the part with pure water piping. According to the first aspect of the present invention, the ultrasonic transducer is provided in the cooling piping system, so that rust generated in the cooling piping system can be removed, and the inner wall is removed. Soot, bacteria, etc. adhering to can be removed. At that time, since the gas inside the cooling water is removed in advance by the deaeration device, it is possible to prevent the generation of bubbles caused by the ultrasonic wave generated by the ultrasonic vibrator, and effectively in the long cooling pipe Can be washed. Furthermore, by providing a deaeration device in the cooling pipe, corrosion inside the piping of the cooling water can be prevented and generation of bacteria can be prevented. [0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of the structure and basic concept of a first embodiment of the present invention. FIG. 2 is an explanatory diagram of the structure and basic concept of a second embodiment of the present invention. FIG. 3 is an explanatory diagram of the structure and basic concept of a third embodiment of the present invention. FIG. 4 is an explanatory diagram of the structure and basic concept of a fourth embodiment of the present invention. FIG. 5 is an explanatory diagram of a prior art. FIG. 6 is an explanatory diagram of another prior art. [Explanation of Symbols] 1 Cooling piping equipment 2 Deaeration device 3 Ultrasonic vibrator 5 Cooling piping 6 Pump 7 Cooling device 8 Filter 9 Vacuum exhaust device 11 Water supply port 12 Drainage port 13 Metal ion introduction device 14 Inlet device 15 Ozone generation Device 16 De-airing device

──────────────────────────────────────────────────── ----- Continuation of Front Page (56) References Japanese Patent Laid-Open No. 3-28695 (JP, A) Japanese Patent Laid-Open No. 1-127899 (JP, A) Japanese Patent Laid-Open No. 6-315847 (JP, A) 226010 (JP, A) JP 7-328313 (JP, A) JP 63-15002 (JP, A) JP 9-61091 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F28G 7/00 F25D 17/02

Claims (1)

(57) [Claims] [Claim 1] In a cooling pipe facility provided with an ultrasonic vibrator for cleaning the inside of the cooling pipe in the cooling water supply pipe to the cooling pipe, the cooling water supply pipe A degassing device for removing dissolved gas in the inside , the generation of bubbles due to ultrasonic vibration is prevented by the degassing device, and the transmission distance of ultrasonic waves in the cooling water by the ultrasonic vibrator is increased. Characteristic cooling piping equipment.