JPS59164897A - Method of cleaning ball circulation passage of ball circulation type cooling pipe cleaning device - Google Patents

Abstract

PURPOSE:To prevent any impairment due to clinging and growing of marine product at the time of restarting by circulating cleaning water in a ball circulation piping that includes a ball connector to retrieve a ball. CONSTITUTION:In order to clean ball circulation piping, a control switch is turned ON. Then, operations to open a strainer screen 6, to start pumps 8, 9, 10, and to open a collector inlet valve 12 are done, followed by closing of a collector by-pass valve 11. By these operations, a collector switch valve 13 allows only flowing cleaning water. Therefore, as only the sea water is circulated in the ball circulation piping including the ball collector 13, products in it and foreign matters stuck on a screen 6 can be washed away.

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a method for cleaning a ball circulation path in a condenser ball circulation cooling tube cleaning device that uses seawater. [Technical background of the invention and its problems] In a water-tight system, the cleanliness of the cooling pipe determines the water-tight performance, and the degree of contamination is determined by a decrease in the degree of vacuum, an increase in water head loss in the pipe, and a decrease in the cooling water outlet. As the temperature difference between
1 appears, so you have to clean the water pipe accordingly. One method f2 for cleaning the cooling water pipe is a ball circulation method in which sponge balls are circulated through the entire cross section of the cooling pipe together with the cooling water to continuously clean the cooling pipe for 1 m. This ball circulation type cleaning is performed at a frequency of about the same level every week, but when the ball is stopped, the ball circulation path, especially the ball collector where the balls are collected, is cleaned.

[Second sea water accumulates, marine products adhere and grow, and become an obstacle when restarting. [Object of the Invention] An object of the present invention is to provide a ball circulation system for a ball circulation type cooling pipe cleaning device that can eliminate obstacles in advance when performing ball circulation cleaning by cleaning the ball circulation path including a pole connector for collecting balls. To provide a road cleaning method. [Summary of the Invention] The ball circulation path cleaning method of the present invention is performed by circulating cleaning water in the middle of the ball circulation conduit including a ball connector for collecting balls, while the ball circulation function is stopped. It is characterized by cleaning the inside of the tract. [Embodiment of the Invention] An embodiment of the present invention will be described below as shown in the drawings. As shown in Figure 1, No. 2, a cooling pipe cleaning device for a condenser that implements the cleaning method according to the present invention employs a ball circulation cleaning method. In diagram IT51, a pre-screen 4 is provided in the seawater artificial pipe 3 of the cooling pipe 2 of the condenser 1, and a strainer screen 6 is provided in the outlet pipe 5C. The ball circulation pipe 7α is pulled out from a part of the strainer screen 6, and the strainer water supply pump 8. Via the ball re-injection pump 9 and the ball recirculation pump IO, the discharge side of the ball recirculation pump 10 is connected to the prescreen 4 via a bypass pipe 18 with a collector bypass valve 11. Further, the discharge side of the recirculation pump 10 is branched from the upstream side of the collector bypass valve 11 and connected to the collector population valve 12 and the ball collector 13, and is connected to the collector via the collector switching valve 14 provided at the outlet of the pole connector 13. It is connected to the downstream side of the bypass valve 11. The pre-screen 4Fi mentioned above is used to remove foreign substances that may be contained in seawater.The strainer screen 6 normally allows the flow of cooling water coming out of the cooling pipe 2, but when cleaning the balls, the screen is closed and the balls are removed. 1"k is configured so that the ball is collected into the ball circulation pipe 7α. Also, the collector bypass valve 1] and the collector population valve 12 are set to ON, O.
The flow of cleaning water is controlled by FF. The collector switching valve 14 has two functions: a closed state in which the ball 17 is stored in the S-ball connector 13 as shown in the figure, and only wash water is allowed to pass therethrough, and an open state in which the ball 17 and the wash water are allowed to pass therethrough. Furthermore, a switching valve 16 is connected to the seawater pipe 15 that supplies the C1 condensate I.
The rotation of this valve 160 (-therefore, it is controlled between the forward washing state shown in 1 and the reverse washing state shown in 1). In normal operation in vessel I, the switching valve I6 is in the state shown, and the flood water is discharged from the line 15 via the prescreen 4, through the agitation %2, and through the strainer screen 6. Heat exchange is performed between the outside of 20 yen.To enter the normal washing operation of the cooling pipe 2 from this normal operating state, since the collector bypass valve 11U is open,
The mass strainer screen 6 is closed and the strainer feed pump 8° ball ladle injection pump 9 and ball recirculation pump 10 are started in sequence. In this state, pole collector 13
The ball circulation path except for the second water #i wharf starts. Next, when the collector population valve 12 is opened, the collector bypass valve 1] is closed, and the collector switching valve 14 is opened, the ball 17 in the collector 13 flows out from the ball and ring passage 7C to the bypass pipe 18, and the pre-screen 4, the seawater enters the cooling pipe 2 through the inlet pipe 3, washes out marine generated v/J'l, etc. adhering to the inside of the cooling pipe, flows out to the outlet pipe 5, and adheres to the strainer screen 6. The circulating balls 17 are soft and spongy.
A diameter approximately equal to the inner diameter of the cooling pipe 2 is used. The balls 17 gathered on the strainer screen 6 are passed through the ball circulation paths 7Q and 7t by the strainer water supply pump 8C2.
+ and returns to pole collector I3 through ball reinjection pump 9 and ball recirculation pump 10. After the ball continues to circulate for a certain period of time, it starts to stop, but the movement + 1'li < id
'? Close the collector switching valve 14 and switch off the ball collector 13.
After the balls 17 are collected, after a period of time when all the balls are considered to have been collected, the collector bypass valve 11 is fully opened, the collector population valve 12 is fully closed, the strainer screen q is fully opened, and each pump 8, 9, and 10 is stopped. The operation ends. However, in the ball circulation path cleaning method of the cooling pipe cleaning device of the present invention, the ball circulation cleaning is carried out at the same level (once per week), but when the ball circulation path 52 is stopped, seawater stagnates and marine products are removed. There is a risk that the ball may adhere and grow and become an obstacle to restarting.Therefore, the present invention is characterized by adding a function to automatically wash away the foreign matter present in the ball circulation path C2 prior to restarting. In other words, Figure 2 shows the functional sequence.
By turning on the operation switch 20 and other mantle conditions 21 (such as the ball circulation cleaning sequence being set to "stop"), the strainer screen 6 is closed, each pump 8,
9.10 startup operation, opening operation of collector population valve 12, and closing operation of collector bypass valve 1]. The strainer screen 6 is configured to fully close once and then fully open again. By configuring such an operation washing sequence with a sequence circuit, when cleaning the ball circulation path, the operation switch 20 can be turned on. ”. If the necessary condition 21 is satisfied at this time, the "in" circuit is self-held by the self-holding circuit 22, and the opening operation of the strainer screen 6, each pump 8,
9. When the starting operation in 10 and the opening operation of the collector population valve 12 are performed and the collector bypass valve 11 is closed according to the fully open condition of the collector inlet valve 12, the collector switching valve 13 is in the closed state where only the wash water passes + There are two. In this way, only seawater circulates in the ball circulation path including the ball collector 13 shown in FIG. Therefore, by operating this at the same speed twice a day, it is possible to prevent problems when performing ball circulation cleaning of the condenser cooling pipe 2. To stop this operation, press the operation switch 20.
By turning off C2, the self-holding circuit 22 is released, and all operations return to their original state and end. FIG. 3 shows a sequence circuit corresponding to the functional sequence of FIG. 2. Connect the "ON" contact of the operation switch 20 to the control lines P and H to the other necessary contact contacts 21 and the auxiliary relay A.
Connected in series with X. Auxiliary contact t of auxiliary relay AI
A1 and the "off" contact of the operation switch 20 are connected in series to form a self-holding circuit 22. This auxiliary relay A
I each auxiliary contact ta2゜tz3. ta4. ta
5. t(Z6. tQ7. ta8 and tbl,
t'b2 creates operating conditions 101 for each device and controls the operation circuit (not shown) of each device. That is,
By operating the operation switch 20, the functional operations explained in FIG. 2 are performed. [Effects of the Invention] As described above, according to the present invention, the ball circulation pipe including the C ball collector can be cleaned while the ball circulation function is stopped. During this process, damage caused by adhesion and growth of marine products can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the ball circulation type cooling pipe cleaning device for a condenser according to the present invention, and Fig. 2 explains the ball circulation path cleaning method of the ball circulation type cooling pipe cleaning device of the present invention. FIG. 3 is a sequence control circuit diagram of the present invention. 1... Condenser 2... Cooling pipe 3... Seawater inlet pipe 4... Pre-screen 5... Seawater outlet pipe 6... Strainer screen 7a, 7b, 7
c...Ball circulation path 8...Strainer water supply pump 9...Ball reinjection pump IO...Ball recirculation pump 11...Collector bypass valve

Claims (1)

[Claims] (1) In a ball circulation type cleaning device used for cleaning cooling pipes of a steam turbine condenser, the inlet log G2 of the ball collector that collects balls is connected to the collector valve that controls the flow of cleaning water to the outlet C2. A ball collector switching valve is provided that functions in an open state that allows the balls to flow together with the wash water, and a closed state that stops the flow of the ball and allows only the wash water to pass through, and a bypass pipe having this pole collector C bypass valve is also provided. system and the pole circulation function is stopped. C2: By closing the bypass valve, closing the collector switching valve, and opening the collector population valve, the ball circulation path including the pole collector [1. Features: Ball circulation path cleaning method of ball circulation type cooling pipe cleaning device