JPH0328695A - Continuously cleaning apparatus for spat adherence preventing condenser - Google Patents

Abstract

PURPOSE:To prevent microorganisms such as spats, etc., from adhering by providing ultrasonic vibration generators at a ball pouring tube and a ball removing tube. CONSTITUTION:Cooling water passing in a heat transfer tube 2 in a condenser 1 is guided from a circulation water tube 3, passed through the tube 2 of the condenser, and guided to a water discharge passage of a circulation water tube 5. Microorganisms such as spats adhere to a sea water system and particularly a ball pouring tube and a ball removing tube during operation or even during stoppage of a continuously cleaning apparatus of the condenser 2. Thus, ultrasonic vibration pieces are secured to the removing tube 7 and the pouring tube 20, and ultrasonic wave oscillators 25, 28 are respectively connected thereto via cables 24, 27. Ultrasonic vibration is applied to the outer surfaces of the tubes 20, 7 to form a fluidizing floor state at the microorganisms such as the spats. Therefore, the adherence of the microorganisms is prevented to prevent growth of shells in the tubes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for preventing the adhesion of young shellfish to the inner surface of piping of a continuous cleaning device for condensers of large power and nuclear power generation facilities.

[Conventional technology]

Thermal power and nuclear power 1! The seawater used as cooling water for the equipment's condenser contains a large amount of marine microorganisms such as young shellfish and plankton, and these microorganisms are absorbed when passing through the heat transfer tubes of the condenser along with the IHJ water. It not only adheres to the inner surface of the tube and reduces heat transfer efficiency, but also grows inside the heat transfer tube, causing tube blockage and possibly damaging the tube.

For this reason, it is common to install a cleaning device in the condenser that cleans the heat transfer tubes by circulating sponge balls intermittently or continuously. An example of a conventional condenser cleaning device will be explained with reference to FIG. In the piping system, seawater is introduced from the circulating water pipe 3 to the heat transfer pipe 2 of the condenser 1, cools the condenser, and is discharged through the circulating water pipe 5.
Sponge balls are led together with seawater from a ball extraction pipe 9 connected to a ball extractor 7, and enter a ball circulation pump 13 via a main tank T-10, piping 10, and a valve 12. Here, the pressurized seawater passes through the valve 14 and enters the ball replenishment tank 15.
In addition, the replenishment ball rides on the flow of seawater from the valve 16, passes through the ball circulation pipe 18 and valve 19, enters the ring pipe from the outlet of the ball injection pipe 20, and flows into the flow of seawater in the circulation water pipe. It passes through the heat exchanger tube 2 of the condenser, and here,
Microorganisms, etc. on the inner surface of the heat transfer tube are washed off and purified by sliding with a sponge. It is common to perform this operation at least once a day or twice a day, but as the sponge ball will wear out,
If necessary, open well 21 and valve 22, and open valve 14.
is closed and collected in the consumable ball tank 23.

In this conventional device, the ball injection pipe 9 and the ball intake pipe 20 are inside the circulating water pipe, and are affected by the flow of circulating water during operation, preventing the water from stagnating, thereby preventing shellfish growth. Growth is fast without being hindered by the ball injection tube 2
0 to main valve] -9 vicinity, ball take-out pipe 9 and main valve 10
There are shellfish attached near the bowl, which often causes the bowl to become clogged.

To this end, methods have been devised for purging the ball-width piping system against marine life by providing various accessory devices.
One of them is a method, as disclosed in Japanese Patent Application Laid-Open No. 59-164897, in which fresh water is passed through the piping equipment system during the stoppage of the ball circulation system, but this method does not cause radioactive contamination at all. It is necessary to install a new piping system to separately provide water for the system and inject it using a booster pump. Furthermore, if the ball circulation operation due to continuous cleaning is carried out for a long period of time or if the operation is frequently stopped, it is inevitable that water consumption will increase.

[Problem to be solved by the invention]

7. Conventional technology, limited to thermal power generation equipment, kills shellfish by injecting fresh water or highly alkaline water from the condensate system, regardless of whether it is hot or cold water, or from the condensate system. However, in nuclear power generation equipment,
Due to the leakage problem of radioactively contaminated water, the condensate system cannot be used, and new pure water must be prepared for use. In addition, it is difficult to apply it during continuous cleaning, and there is also the problem that it consumes a large amount of water.

The purpose of the present invention is to prevent the continuous cleaning of condensers from occurring even during operation.
In addition, even when the seawater system is stopped, the ball injection pipe,
Another object of the present invention is to provide an accessory device for a piping system configured to prevent microorganisms such as fIB shellfish from attaching to the vicinity of the ball take-out pipe in order to prevent the attachment and growth of microorganisms such as young shellfish.

[Means to solve the problem]

] In order to achieve the second objective, ultrasonic vibrations are applied to the outer surface of the pipe to generate ultrasonic bubbles between the seawater and the inner surface of the pipe, and a fluidized bed state is formed for microorganisms such as young shellfish. This system is designed to prevent microorganisms from growing in the pipe by preventing microorganisms from growing inside the pipe, both when the seawater is stopped and when the seawater is flowing.

[Effect]

The pressure waves of the present invention are applied as a kind of relative displacement between the piping and the seawater, and the ultrasonic wave is applied to the outer surface of the piping to vibrate the piping, thereby creating positive and negative pressure between the seawater and the piping. There are two effects: creating bubbles and forming a floating state. In the former case, microorganisms and the like vibrate on the pressure waves of the seawater, and the relative displacement with the piping prevents them from settling. On the other hand, the latter has the effect of creating positive and negative pressure between the piping and the seawater, causing deposits to fall off and washing away, and combined with the formation of bubbles, has the effect of preventing the settlement of young shellfish, etc. .

〔Example〕

Hereinafter, five embodiments of the present invention will be explained with reference to FIG. Part ■
The figure shows a ball circulation type condenser continuous cleaning device equipped with a device for preventing the settlement of young shellfish using ultrasonic waves according to the present invention. As is well known, the steam discharged from the final stage of the steam generator is transferred to the condenser 1. Some condensers have tens of thousands of thin heat transfer tubes 2 for heat exchange, which are partitioned into a seawater chamber and a steam chamber by tube plates on both sides. Seawater passes through the heat transfer tubes, cooling the steam introduced into the steam room, maintaining condensation and vacuum, and maintaining the steam turbine at high efficiency.

Here, the cooling water passing through the heat transfer tubes in the condenser is circulated through water pipe 3.
A ball collector 7 is arranged between the circulating wood pipe introduced from the condenser and guided to the discharge channel side of the circulating water pipe 5 through the heat transfer pipe 2 of the condenser and the outlet of the condenser. There is a ball take-out pipe 9 in the.

Sponge ball for cleaning. It is separated into seawater and balls by the grid of the ball t+IJ collector, passes through the ball take-out pipe together with some seawater, passes through the main valve 9 and the ball circulation piping 1l, and rides the flow of seawater pressurized by the ball circulation bomb 13. Bypass valve 1 for continuous ball circulation without ball recovery through the ball recovery device inlet valve 14
7, on the other hand, when replenishing and throwing in balls, it passes through the outlet valve 16, passes through the ball circulation pipe 918, and connects to the main valve ]-9.
,Furthermore, the ball flows from the outlet of the ball injection pipe 20 through the circulation wood pipe to the heat transfer tube of the condenser, and as it passes through the heat transfer tube, the sponge balls wash off dirt such as deposits on the inner surface of the heat transfer tube. , sponge balls are collected with a ball collector,
The ball flows repeatedly through the circulatory system. here. An ultrasonic vibrating piece is fixed to the ball take-out pipe 7, the main valves 1 and 0, and the ball circulation pipe ■1, and an ultrasonic transmitter 25 and its cable 2 are attached to this.
Connect by 4. On the other hand, an ultrasonic vibrating piece is fixed to the ball injection tube 20 in the same way as the ball injection tube, and the ultrasonic wave is emitted.
Connect to a28 by cable 27.

Continuous cleaning of the ball circulating condenser is generally carried out once or more a day for a certain period of time, and a ball recovery device 23 is provided to recover the balls when the cleaning is stopped.

That is, the sponge balls are collected by opening the valves 21 and 22, closing the valves 14 and 17 of the ball circulation system, and operating the ball circulation bomb.

By passing sponge balls through the condenser in this way, deposits inside the heat transfer tubes are washed away and cleanliness is maintained without B1 accumulation, but the ball circulation system piping passes through a large amount of balls. Therefore, there is no need to wash microorganisms such as young shellfish, which have a large caliber, and young shellfish may settle and grow during pauses in continuous washing. Particularly, the ball take-out pipe and the ball injection pipe are partially inside the circulating water pipe, and are thought to become hotbeds for attachment and habitat of young shellfish, and growth can often be seen in those parts even in Actual Plans 1~. An example of this is shown in FIG. 3, in which barnacles adhere to the inner surface of the ball injection tube, grow, and clog the tube.

In this way, young shellfish are r1 in the piping close to the circulating water pipe, and the adhesion of microorganisms to the ball take-out pipe and the ball injection pipe is
Applying ultrasonic waves to this piping is most effective.

An example of how to fix the ultrasonic pressure wave generator will be explained with reference to FIGS. 2 and 5. That is, the barium titanate ultrasonic vibration generator 26 is brought into close contact with the surface of the ball injection tube 20 via the aluminum medium 30, and is fixed by the fastening tools 30, 34 and 35. A high-frequency AC voltage is applied between terminals 36 and 37 of the ultrasonic vibration generator to generate an ultrasonic wave, which is propagated to the seawater in the pipe.

〔Effect of the invention〕

According to the present invention, microorganisms such as young shellfish are prevented from settling on the ball extraction pipe and the ball injection pipe by ultrasonic pressure waves.
11, even during continuous ball circulation cleaning.
Even during suspension, shellfish adhesion is always prevented, shellfish growth and blockage are avoided, and the ball circulation type continuous cleaning device is operated without the ball becoming obsolete during operation, so the condenser maintains high efficiency. can be maintained.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention, FIG. 2 is a sectional view showing an example of a method of fixing the ultrasonic vibration generator of FIG. 1, and FIG.
The figure is a side view of Figure 2, Figure 4 is a sectional view showing an example of a situation where barnacles are attached to the ball injection tube, and Figure 5 is a side view of Figure 2.
FIG. 2 is a system diagram showing the operating status of the ring type condenser continuous cleaning device. 1... Condenser, 2... Heat exchanger tube, 3... Circulating water pipe intake channel side, 5... Circulating wood pipe discharge channel side, 7... Ball collector, 9 ball outlet pipe, 11... Ball Circulation piping,】3
・Ball circulation pump, work 5...Ball feeder, 2 3
a, No. {Sen 1-・Fukukiken $4riJ $2 Figure #3 Figure Tea 5 Tsugu

Claims (1)

[Scope of Claims] 1. In a continuous condenser cleaning device consisting of a ball injection pipe, a ball circulation device, and a ball take-out pipe for thermal nuclear power generation equipment, the ball injection pipe and the ball take-out pipe are A continuous condenser cleaning device with prevention of young shellfish settlement, characterized by being equipped with a sonic vibration generator.