JP3872975B2 - Ball sorting and throwing device used in condenser condenser cleaning equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for preventing ball clogging in an automatic ball sorter of a condenser thin tube cleaning system used for thermal power and nuclear power generation facilities.
[0002]
[Prior art]
In thermal power / nuclear power generation facilities, the seawater for cooling passes through the heat transfer tubes (thin tubes) of the condenser connected to the turbine generator. It adheres to the inner wall of the thin tube and causes a decrease in cooling efficiency. In order to maintain the cleanliness of the inner wall of the thin tube at a predetermined value, ball cleaning is performed during normal operation. This is to prepare a soft synthetic resin (so-called sponge) ball having a hollow inside, and pass it through a thin tube to scrape off water scales, seawater products, etc. adhering to the inner wall.
[0003]
For example, the above-described ball is used for a cleaning operation about once a day, and if excessive contamination occurs in the thin tube, the cleaning operation is performed 2 to 3 times a day. The ball has an outer diameter that is slightly larger than the inner diameter of the thin tube at the beginning, but the outer shape is worn away after use for a long time and becomes smaller than the inner diameter of the thin tube. If this size falls below the specified value, the cleaning effect will decrease, so after use for a predetermined time (number of times) determined empirically, store it in a ball collector and replace it with a new one, In order to deal with the next cleaning, the outer dimensions of the outer shape were thrown away, the one whose size was smaller than the predetermined value was discarded, the larger amount was replenished and only the larger one was reused.
[0004]
[Problems to be solved by the invention]
However, the balls easily get caught between the screens of the sorter, and periodic inspections are necessary to monitor and remove the stagnant balls. In addition, since the operation of throwing the balls into the sorter or exchanging the balls is performed manually, it is cumbersome, and therefore, a method of exchanging all after a predetermined period of time is generally performed. It was. Therefore, there was a problem that was not economical.
[0005]
An object of the present invention is to provide a condenser capable of automatically selecting a ball that can no longer be used because the outer diameter has become small due to wear and the ball cannot be used due to wear, and refilling a new ball. An object of the present invention is to provide a ball sorting and charging device for a thin tube cleaning device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as described in the claims. As an example, in a ball cleaning device that cleans the inner wall of a condenser thin tube, between a valve provided in a path from a ball circulation pump to a ball recovery device and a ball insertion pipe for introducing a ball into the circulation water pipe. An installed ball sorting and throwing device, a comb-like blade rotating by a shaft, a screen in which a plurality of inlet valves are formed by partitioning a predetermined distance in the thickness direction by a plurality of ring-shaped plates, A counting device that counts the number of balls that have passed through the screen, and a ball reservoir that supplies a number of new balls corresponding to the result, and the predetermined distance is set to be greater than or equal to the outer shape of the balls that cannot be used. The tip of the comb teeth pushes back the ball stagnated in the inlet valve by the rotation of the blade.
[0007]
In this example, the pushed-back ball can be used, discharged from the ball outlet, and put into the circulating water pipe through the ball throwing pipe.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of a condenser condenser tube cleaning apparatus using a ball, in which the ball sorting and charging device of the present invention is installed.
[0009]
Reference numeral 1 denotes circulating water for cooling, which is taken from the intake port using seawater as a source. 2 is a condenser whose upper part is connected to the turbine generator, 3 is a ball collector, 4 is a ball circulation pump, 6 is a ball collector, 7 is a ball inlet pipe, 8 is a ball, 9 is a condenser 2 A large number of narrow pipes 10 and 10 are circulating water pipes.
[0010]
In the washing operation, the ball circulation pump 4 is activated, and the balls 8 discharged from the ball collector 6 are thrown into the circulating water 1 through the ball throwing pipe 7 and passed through the narrow pipe 9 of the condenser 2. Due to this passage, scales and seawater products adhering to the inner wall of the thin tube 9 are scraped off, and after the passage, they are collected in the ball collector 3 together with the circulating water 1 containing the dirt. Part of the circulating water 1 is discharged from the outlet, and part of the circulating water 1 returns to the ball collecting unit 6 through the ball circulation pump 4 together with the balls 8. This circulatory action is performed several times in the tens of minutes.
[0011]
The portion surrounded by the dotted line is a sorting system including the ball sorting and throwing device 5 of the present invention.
11 is a ball reservoir, 12 is a ball meter, and 13 is a wear ball counter.
[0012]
The figure shows a state in which when the ball sorting and throwing device 5 operates, the inlet side valve of the ball collecting device 6 is closed and the ball 8 flows from the ball circulation pump 4 to the ball sorting and throwing device 5 side. At this time, the ball collecting unit 6 side of the inlet side valve of the ball throwing pipe 7 is blocked.
[0013]
The balls 8 discharged from the ball circulation pump 4 are introduced into the ball sorting and throwing device 5 and sorted into unusable ones worn by operations described later and reusable ones. The number of unusable balls is counted by the wear ball counting device 13, and new balls corresponding to the number are supplied from the ball reservoir 11. After the quantity is measured by the ball weighing instrument 12, the quantity is sent to the ball throwing pipe 7 via the ball sorting thrower 5.
[0014]
2 is a partial cross-sectional view showing details of the ball sorting and throwing device of the present invention, FIG. 3 is a plan view of the shaft 14a, blade 15 and screen 16 as viewed from above in FIG. 2, and FIG. It is explanatory drawing of the condition extruded.
[0015]
The shaft 14a is integrated with the comb-like blade 15 and is rotatably supported by the bearing 14b. Reference numeral 17 denotes a ball insertion port into which a new ball is inserted, 18 denotes a ball inlet into which a ball 8 sent from the ball circulation pump 4 flows, 19 denotes a ball outlet, 20 denotes a wear ball discharge port, and 8a has a size larger than a predetermined outer shape. The ball 8b is an unusable ball that is worn and has a size equal to or smaller than a predetermined outer shape.
[0016]
The screen 16 is formed by stacking a plurality of ring-shaped plates vertically with a predetermined distance to form a plurality of inlet valves 16a. The vertical dimension of the inlet valve 16a is a value through which a ball 8b having an outer dimension that is worn and cannot be used can pass. Accordingly, when the ball 8b worn below the predetermined outer dimension moves in the vicinity of the inlet valve 16a, the ball 8b passes through the inlet valve 16a and flows to the upper worn ball discharge port 20 side.
[0017]
The balls 8b flown from the wear ball discharge port 20 pass through the wear ball counting device 13 and are stored in the storage basket. Based on the count result, new balls corresponding to the number of balls are stored by the control means (not shown). Supplied from the vessel 11. After the quantity is measured by the ball measuring instrument 12, it is replenished to the ball sorting / inserting device 5 through the ball insertion port 17. Then, it is sent to the ball throwing pipe 7 through the ball outlet 19. Here, new balls stored in the ball reservoir 11 are pre-hydrated. When the non-hydrated ball is thrown into the ball reservoir 11, it can be dealt with by installing a moisture-containing chamber between the charging valve and the meter 12.
[0018]
Most of the balls 8a having an outer dimension that can be used flow to the ball outlet 19 side, but some of the balls 8a are caught by the inlet valve 16a due to elastic deformation and partially stay. When the shaft 14a rotates, as shown in FIG. 4, the tip of the comb teeth of the blade 15 hits the ball 8a sandwiched between the inlet valves 16a, and the ball 8a is pushed out as indicated by an arrow and flows toward the ball outlet 19 side. Here, the tip of the comb tooth of the blade 15 is set to an optimum specification such as a shape that is easily pushed when hitting the ball 8a, and a distance from the outermost shape of the screen 16. For this reason, the ball sandwiched by the rotation of the blade 15 is automatically pushed out, and the stagnation is prevented.
[0019]
【The invention's effect】
According to the present invention, the ball does not stagnate on the screen, and it is possible to automatically select a ball that has become unusable due to wear and becomes unusable and a refill of a new ball.
[Brief description of the drawings]
FIG. 1 is a diagram showing an application of a ball sorter according to the present invention to a cleaning system.
FIG. 2 is a diagram showing details of a ball sorting and throwing device of the present invention.
FIG. 3 is a view of a screen and a blade as viewed from above in FIG. 2;
FIG. 4 is an explanatory diagram of a situation in which a ball sandwiched between screens is pushed out.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Circulating water, 2 ... Condenser, 4 ... Ball circulation pump, 5 ... Ball selective charging device, 6 ... Ball collection | recovery device, 7 ... Ball injection pipe, 8 ... Ball, 9 ... Narrow pipe, 10 ... Circulating water piping, DESCRIPTION OF SYMBOLS 11 ... Ball reservoir, 13 ... Wear ball counting device, 14a ... Shaft, 15 ... Blade, 16 ... Screen, 16a ... Inlet valve.

Claims (2)

A ball sorting and throwing device used in a condenser thin tube cleaning device for cleaning the inner wall of a condenser thin tube using a ball,
The condenser thin tube cleaning device is:
A condenser thin tube cleaning device that collects the balls after washing the thin tube inner wall of the condenser and throws the collected balls into the cooling water supplied to the condenser,
The ball sorting and throwing device is provided in a path that joins the recovery path after branching from the recovery path,
A screen having a plurality of ring-shaped plates divided by a predetermined distance in the thickness direction to form a plurality of inlet valves is formed, balls that have passed through the inlet valves are discharged as wear balls, and balls that do not pass through the inlet valve are While being sent to the collection path as a usable ball,
A comb-shaped rotatable blade having a rotation shaft at the center of the ring-shaped screen, the tip portion being located in the inlet valve, and the thickness of the tip portion being smaller than a predetermined distance of the inlet valve, A ball sorting and throwing device used in a condenser thin tube cleaning device, wherein the ball stagnated in the inlet valve is pushed back outward. A ball sorting and throwing device used in a condenser thin tube cleaning device for cleaning the inner wall of a condenser thin tube using a ball,
The condenser thin tube cleaning device is:
Collect the balls after washing the inner wall of the condenser's thin tube, collect the collected balls in a ball collector via a ball circulation pump, and supply the cooling water to the condenser with circulating water piping It is a condenser thin tube cleaning device to be thrown in,
The ball sorting and charging device is provided in a path that joins the circulating water pipe after branching through a valve from between the ball circulation pump and the ball collection device,
A screen having a plurality of ring-shaped plates divided by a predetermined distance in the thickness direction to form a plurality of inlet valves is formed, balls that have passed through the inlet valves are discharged as wear balls, and balls that do not pass through the inlet valve are While being sent to the circulating water piping as a usable ball,
A counting device that counts the wear balls that have passed through the inlet valve, a ball reservoir that replenishes new balls into the path according to the counting result of the counting device, and a rotating shaft at the center of the ring-shaped screen A condenser thin tube cleaning device comprising: a comb-like rotatable blade having a tip portion located in the inlet valve and having a tip portion thickness smaller than a predetermined distance of the inlet valve Ball sorter used in

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