JP2017075749A - Emergency measure method against steam condenser cooling pipe leakage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emergency measure method against steam condenser cooling pipe leakage capable of realizing similar or equivalent repairing effects at any cooling pipe constituting a group of cooling pipes when cooling water is leaked at any one of cooling pipes constituting a group of cooling pipes at a condenser.SOLUTION: This invention relates to an emergency measure method 20 against leakage at cooling pipes of a condenser and the emergency measure method 20 is carried out when an electric conductivity measured by a salt detection device 8 mounted at a water chamber 7a of a condenser 1 is increased, sawdust 23 is added into cooling water 11 and the sawdust 23 is clogged into small holes generated at a cooling pipe 6, a leakage of the cooling water 11 from the cooling pipe 6 is temporarily stopped, the sawdust 23 added into the cooling water 11 is water-inclusive sawdust 16 having moisture absorbed in advance, and the water-inclusive sawdust 16 is fed into the cooling water 11 at the upstream side of a cooling water feeding pump 13 installed at an upstream side of the cooling water feeding pipe 12.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an emergency treatment method at the time of leakage of a condenser cooling pipe that can simultaneously exhibit the same repair effect in individual cooling pipes constituting a target cooling pipe group when the condenser cooling pipe leaks.

Conventionally, thermal power plants and nuclear power plants have a water circulation system using a turbine coupled to a generator. For example, this circulation system has a structure in which water is heated by a boiler to form steam, and this steam is ejected to the turbine to rotate the turbine. And the steam after rotating a turbine is condensed by the condenser which uses seawater as cooling water, and is condensed. And this condensate is made into steam by being heated again by the boiler, and is again ejected to the steam turbine.
That is, in a thermal power plant or nuclear power plant, steam is condensed by a condenser using seawater as cooling water, and the condensed water is circulated in the power plant as circulating water.
In power plants such as those mentioned above, seawater may leak from the cooling pipes that distribute the seawater for cooling. In this case, seawater enters the condenser and seawater enters the condensate. There was a case.
And since condensate circulates in a power plant, if seawater mixes in condensate, it may cause corrosion in the components and piping of the power plant, which is not preferable. For this reason, in a power plant, whether seawater is leaking inside the condenser is an important problem, and the presence or absence of seawater leakage into the condensate is constantly monitored.
In addition, if leakage of seawater to condensate is detected, it is necessary to repair the cooling pipe that has leaked seawater immediately, but depending on the operating conditions of the thermal power plant or nuclear power plant, repair work cannot be started immediately. In some cases, a repair technique for temporarily stopping the leakage of the cooling water (seawater) from the cooling pipe was required.

  At present, no prior art documents having the same problems to be solved as the present invention have been found, but the following are known as prior arts in the related technical field.

Patent Document 1 discloses a condenser using a sponge ball for removing dirt adhering in a condenser pipe under the name of “condenser”, in particular, an invention relating to an improvement of the water chamber structure. ing.
A condenser disclosed in Patent Document 1 includes a cooling pipe group whose both ends are held substantially horizontally by a tube plate, a water chamber having a horizontal floor disposed adjacent to both tube plates, In a condenser with a cooling water inlet or outlet pipe that has an upper opening in the horizontal floor of the chamber and a flange in the lower opening, the horizontal floor of the water chamber on the cooling water introduction side is connected to the lower end of the tube plate. The horizontal floor from which the portion extending from the side edge in contact with the upper edge to the peripheral edge of the tube plate side of the upper opening is removed, and the pipe wall portion from which the introduction pipe is suspended from the peripheral edge of the upper opening to the flange is omitted. An inclined pipe that extends from the lower end of the tube plate to the periphery of the opening where the flange is opened, and is connected to both ends of the inclined plate, and the open side end of the pipe wall of the introduction pipe and a horizontal floor A vertical wall connected to the open side end of is attached.
According to the invention disclosed in Patent Document 1 having the above configuration, the drift of the cleaning sponge ball in the water chamber is eliminated, and the sponge ball is uniformly distributed to all the cooling tubes of the tube bundle. Therefore, especially the cooling pipe in the outer peripheral part of the tube bundle which has been difficult for the sponge ball to pass through can be sufficiently cleaned. Along with this, the thermal conductivity of the outer periphery cooling pipe increases, so the efficiency of the condenser can be improved.

JP-A-61-195281

The invention disclosed in Patent Document 1 described above belongs to the same technical field as the present invention, but the problem to be solved by the invention is different from that of the present invention.
That is, according to the invention disclosed in Patent Document 1, although the sponge balls can be uniformly distributed to all the cooling pipes of the tube bundle, when the leakage occurs in the cooling pipes, the technique of repairing them is not possible. There wasn't.
In addition, Patent Document 1 discloses, without any disclosure, suggestion or reference about a technique for quickly and uniformly dispersing and mixing fine solids mixed in cooling water into the cooling water before reaching the inlet-side water chamber. Absent.

  The present invention has been made in response to such a conventional situation, and its purpose is to temporarily stop leakage of seawater by closing a small hole formed in the cooling pipe when the condenser cooling pipe leaks. The same repair effect can be exhibited in any cooling pipes that make up the target cooling pipe group at that time, and it takes less time and cost to implement the cooling pipes. It is an object of the present invention to provide a simple emergency treatment method when a condenser condenser pipe leaks without causing any adverse effects.

In order to solve the above-mentioned problem, the first-aid method of the first invention at the time of leakage of the condenser cooling pipe caused an increase in electrical conductivity measured by a salt detection device installed in the water chamber of the condenser. When the condenser cooling pipe leaks, add sawdust to the cooling water and clog the sawdust into the small holes formed in the cooling pipe to temporarily stop the cooling water leakage from the cooling pipe. In the first aid method, sawdust added to the cooling water is water-containing sawdust that has previously absorbed moisture, and the water-containing sawdust is upstream of the cooling water feed pump disposed upstream of the cooling water supply pipe. In the cooling water.
In the first invention having the above-described structure, sawdust is used as a material for temporarily closing a small hole formed in the cooling pipe, so that sawdust is a biodegradable substance. ) Has the effect of reducing the adverse effects on the environment when discharged.
Moreover, it has the effect | action which raises the hydrophilic property of sawdust, and makes it easy to disperse sawdust in cooling water by water-absorbing beforehand in the sawdust thrown into cooling water.
In addition, by specifying the location of the water-containing sawdust upstream of the cooling water feed pump, the water-containing sawdust is uniformly distributed in the cooling water within a short time using the cooling water stirring action of the cooling water feed pump. Has the effect of dispersing.
Thereby, it has the effect | action of equalizing the quantity of the sawdust supplied in each cooling pipe which comprises the cooling pipe group made into the objective of a condenser.

The emergency treatment method at the time of leakage of the condenser cooling pipe according to the second invention is the emergency treatment method at the time of leakage of the condenser cooling pipe according to the first invention, and the hydrous sawdust is molded into a solid form. It is characterized by being.
In addition to the same operation as the first invention, the second invention having the above-described configuration causes the water-containing sawdust to reach the middle of the depth of the flowing cooling water by forming and feeding the water-containing sawdust into a solid state. It has the action. That is, it becomes possible to allow the water-containing sawdust to reach the water flow generation part of the cooling water feed pump.
In this case, it has the effect | action of making uniform the density | concentration of the sawdust of cooling water rapidly using the stirring effect of the cooling water by a cooling water feed pump.

The emergency treatment method when the condenser cooling pipe leaks which is the third invention is the emergency treatment method when the condenser cooling pipe leaks which is the first or second invention, and the cooling water feed pump is A rotating body is provided, and the cooling water is stirred in the water channel.
In addition to the same operation as that of the first or second invention, the third invention having the above-described configuration is provided with a cooling water supply pump, so that the cooling water supply is performed using the rotational force of the rotating body. It has the effect | action of disperse | distributing the water-containing sawdust which reached | attained the water flow generation | occurrence | production part of a pump more efficiently, and equalizing it.

The emergency treatment method at the time of leakage of the condenser condenser pipe according to the fourth invention is any one of the first to third inventions, wherein sawdust contains particles having a particle length in the range of 1 to 5 mm. The rate is 50% or more.
In addition to the same action as the invention described in each of the first to third aspects, the fourth invention with the above configuration increases the repair effect of the leaking cooling pipe especially for sawdust having a particle length in the range of 1 to 5 mm. It has the action.
Moreover, it has the effect | action which improves the repair effect of the leaking cooling pipe by sawdust further by specifying the content rate of the sawdust which has a particle length in the range of 1-5 mm to 50% or more.

The emergency treatment method at the time of leakage of the condenser condenser pipe according to the fifth invention is any one of the first to fourth inventions, wherein a desired amount of hydrous sawdust is introduced into the cooling water at a time. It is a feature.
In addition to the same action as that of each of the first to fourth inventions, the fifth invention having the above-described configuration adds a desired amount of water-containing sawdust to the cooling water at a time so that sawdust is removed from the cooling water. It has the effect of easily producing an area containing a high concentration.
Thereby, it becomes possible to make the cooling water containing a high concentration sawdust flow to the individual cooling pipes constituting the target cooling pipe group. As a result, it is possible to quickly repair the leaking cooling pipe while minimizing the number of times and amount of sawdust.

According to the first invention as described above, the sawdust for closing the small holes generated in the cooling pipe can be smoothly dispersed in the cooling water of a desired area, and the concentration thereof can be made uniform.
As a result, an equal amount of sawdust is supplied to all the cooling pipes constituting the target cooling pipe group, and the repair effect by sawdust in the individual cooling pipes through which cooling water containing sawdust flows is equivalent. Can be.
In addition, by using sawdust as a means to close the small holes generated in the cooling pipe, the cost of obtaining it is minimized, and after use, sawdust is discharged outside the system (ocean) together with seawater (cooling water). The adverse effects on the environment when doing so can be made extremely small.
Furthermore, by supplying hydrous sawdust especially to the upstream side of the cooling water feed pump, the stirring action of the cooling water by the cooling water feed pump is used to quickly disperse the sawdust in the cooling water and make it uniform. be able to.

In addition to the same effect as the first invention, the second invention sinks the hydrous sawdust into the middle of the flowing cooling water by forming the hydrous sawdust into a solid shape and throwing it into the cooling water. Can do.
Thereby, the stirring action by a cooling water feed pump can be utilized effectively, and the density | concentration of the sawdust of cooling water can be equalized more easily and rapidly.

  In addition to the same effects as those of the first or second invention, the third invention is provided with a rotating water feed pump, so that when hydrous sawdust is introduced into the cooling water, By the physical stirring action, sawdust can be dispersed and uniformized in the cooling water more quickly and efficiently.

In addition to the same effects as those of the first to third inventions, the fourth invention uses sawdust containing 50% or more of particles having a particle length in the range of 1 to 5 mm. It is possible to efficiently close and repair the small holes generated in.
Thereby, the certainty of the repair effect of the cooling pipe by sawdust can further be improved.

In the fifth invention, in addition to the same effects as the first to fourth inventions, a desired amount of hydrous sawdust is introduced into the cooling water at a time so that sawdust is contained in the cooling water at a high concentration. Can be easily generated.
Thereby, the repair effect by the sawdust of a leaking cooling pipe can be improved significantly.

It is a cross-sectional conceptual diagram of the condenser which is the implementation object of the emergency treatment method at the time of the condenser condenser pipe leakage according to the embodiment of the present invention and its peripheral equipment. It is a conceptual diagram which notches and shows a part of condenser which is the implementation object of the emergency measure method at the time of the condenser condenser pipe leak which concerns on embodiment of this invention. It is a flowchart which shows the procedure of the emergency treatment method at the time of the condenser condenser pipe leak which concerns on embodiment of this invention. It is a flowchart which shows the preparation procedure of the water-containing sawdust used in the emergency treatment method at the time of the condenser condenser tube leak which concerns on embodiment of this invention. It is a conceptual diagram which shows the preparation condition of the water-containing sawdust used in the emergency treatment method at the time of the condenser condenser pipe leak which concerns on embodiment of this invention. It is an image which shows an example of the solid water-containing sawdust used for the emergency treatment method at the time of the condenser condenser pipe leak which concerns on embodiment of this invention. It is an image which shows an example of the sawdust used for the emergency treatment method at the time of the condenser condenser pipe leak which concerns on embodiment of this invention. (A) It is sectional drawing of the cooling water supply water channel connected to a condenser, (b) It is a top view for the cooling water supply water channel.

  An emergency treatment method when a condenser condenser pipe leaks according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 8.

First, a condenser which is an object of implementing an emergency treatment method when a condenser cooling pipe leaks according to the present embodiment will be described with reference to FIGS.
FIG. 1 is a conceptual cross-sectional view of a condenser and its peripheral equipment, which are targets for implementing an emergency treatment method when a condenser cooling pipe leaks according to an embodiment of the present invention. FIG. 2 is a conceptual diagram showing a part of the condenser that is an object of implementing the emergency treatment method when the condenser cooling pipe leaks according to the embodiment of the present invention.
As shown in FIG. 1, the condenser 1 mainly includes a trunk portion 2, an inlet-side water chamber 3 provided on one side of the trunk portion 2, and an outlet-side water chamber provided on the other side of the trunk portion 3. 4, the inlet side water chamber 3 and the outlet side water chamber 4 are respectively connected by a plurality of cooling pipes 6, and the seawater W as the cooling water 11 is discharged from the inlet side water chamber 3 through the cooling pipe 6 to the outlet side. It is configured to flow into the water chamber 4.
And when passing the seawater W through the cooling pipe 6 installed in the trunk | drum 2, used steam (steam 17) is sent from the steam turbine exhaust port 18 to the cooling chamber 2a in the trunk | drum 2. In the power generation turbine having the structure described above, the steam 17 is cooled on the surface of the cooling pipe 6, aggregates, and flows down under the cooling pipe 6.

More specifically, in the condenser 1 according to the present embodiment, as shown in FIG. 2, the first inlet side water is provided on the supply side of the seawater W used as the cooling water 11 (see FIG. 1). 3A and the 2nd entrance side water chamber 3B are attached, and the 1st exit side water chamber 4A and the 2nd exit side water chamber 4B are attached to the exit side of seawater W (refer to Drawing 1), A number of cooling pipes 6 connecting the first inlet-side water chamber 3A and the first outlet-side water chamber 4A are arranged in parallel in the body portion 2 to form the first cooling pipe group 6A, and the second inlet-side water chamber 3B. And a plurality of cooling pipes 6 connecting the second outlet side water chamber 4B are arranged in parallel in the body part 2 to form a second cooling pipe group 6B, and the body part 2 includes the first and second cooling pipe groups 6A, A tube nest 26 made of 6B is formed.
The first and second inlet-side water chambers 3A and 3B and the trunk portion 2 and the first and second outlet-side water chambers 4A and 4B and the trunk portion 2 are both partitioned by a tube plate 5. One end and the other end of the cooling pipe 6 are supported by the tube plate 5, and a large number of cooling pipes 6 are installed in parallel to the cooling chamber 2 a in the body portion 2.

In addition, as shown in FIG. 2, the first and second inlet water chambers 3A and 3B are respectively provided with first and second cooling water supply pipes 9A and 9B (cooling water supply) provided with a cooling water supply valve 27. The pipe 9) is connected, and seawater W is supplied to the first and second inlet-side water chambers 3A and 3B via the first and second cooling water supply pipes 9A and 9B.
The first and second outlet water chambers 4A and 4B are connected to first and second cooling water discharge pipes 10A and 10B (cooling water discharge pipes 10) each having a cooling water drain valve 28, respectively. The seawater W flowing into the first and second outlet-side water chambers 4A and 4B from the first and second inlet-side water chambers 3A and 3B via the cooling pipe 6 is converted into the first and second cooling water discharge pipes. It is the structure discharged | emitted out of the condenser 1 via 10A, 10B (cooling water discharge pipe 10).

Further, as shown in FIG. 2, the steam 17 (see FIG. 1) is cooled and aggregated in a pipe nest 26 disposed in the cooling chamber 2 a in the body portion 2 at the lower part of the condenser 1. A condensate retention part 7 a for storing the condensate 19 is provided. Furthermore, a condenser outlet 7b is provided at the bottom of the condensate retention part 7a, and the condensate 19 condensed in the condenser 1 is heated again and supplied to the power generation turbine to be generated in the power plant. (Not shown).
As shown in FIG. 2, the condensate retention part 7a is partitioned by a partition plate 29, and condensate 19 that is cooled and aggregated by the first cooling pipe group 6A and the second cooling pipe group 6B. Thus, the condensate 19 formed by cooling and aggregating is not mixed with each other.
In addition, the bottoms of the first condensate retention part (condensate retention part 7a) on the first cooling pipe group 6A side and the second condensate retention part (not shown) on the second cooling pipe group 6B side The salt detection device 8 is individually provided, and is configured to detect leakage of the seawater W (cooling water 11) from the cooling pipe 6 by monitoring the salinity concentration in the condensate 19.
More specifically, since the condensate retention part 7a is partitioned by the partition plate 29, when an abnormality in the salinity concentration is detected in the first condensate retention part (condensate retention part 7a), the first The leakage pipe (cooling pipe 6) exists in the cooling pipe group 6A. On the other hand, if an abnormality in the salinity concentration is detected in the second condensate retention portion disposed on the back side of the condensate retention portion 7a through the partition plate 29, a leakage pipe is provided in the second cooling tube group 6B. (Cooling pipe 6) exists.

Returning to FIG. 1 again, the peripheral equipment of the condenser 1 necessary to implement the emergency treatment method 20 when the condenser condenser pipe leaks according to the present embodiment will be described.
As shown in FIG. 1, the condenser 1 includes a water channel 12 for supplying seawater W as cooling water 11 to the upstream side of the cooling water supply pipe 9 (first and second cooling water supply pipes 9A and 9B). And a cooling water feed pump 13 for causing the cooling water 11 to flow through the water channel 12.
In addition, the water channel 12 includes a hydrous sawdust charging unit 15 for feeding hydrous sawdust 16 into the cooling water 11 on the upstream side of the cooling water feed pump 13.

And by providing the condenser 1 as mentioned above and its peripheral equipment, a small hole (in the cooling pipe 6 constituting the first cooling pipe group 6A or the second cooling pipe group 6B of the condenser 1 ( When the seawater W that is the cooling water 11 leaks due to the occurrence of leakage, the sawdust (hydrous sawdust 16) is dispersed and mixed in the cooling water 11 flowing in the cooling pipe 6 to thereby remove the sawdust. It is possible to temporarily stop the leakage of the seawater W from the cooling pipe 6 by clogging the small holes generated in the cooling pipe 6.
In addition, since the inside of the cooling chamber 2a of the condenser 1 is normally maintained in a vacuum state, if a small hole occurs in the cooling pipe 6 constituting the first cooling pipe group 6A or the second cooling pipe group 6B, this Seawater W as cooling water 11 is sucked into the cooling chamber 2a from the small hole. And by drawing the sawdust dispersed in the seawater W into the small holes generated in the cooling pipe 6 by using such suction force of the seawater W, the small holes are temporarily closed, so that the small holes are temporarily removed from the cooling pipe 6. The leakage of seawater W can be stopped.

The procedure of the emergency treatment method 20 when the condenser condenser pipe leaks according to this embodiment will be described in detail with reference to FIG. 3 and the above-described FIGS.
FIG. 3 is a flowchart showing the procedure of the emergency treatment method when the condenser cooling pipe leaks according to the embodiment of the present invention. The same parts as those described in FIGS. 1 and 2 are denoted by the same reference numerals, and description of the configuration is omitted.
As shown in FIG. 3, for example, when an increase in electrical conductivity is detected in the salt detection device 8 shown in FIGS. 1 and 2 (step S <b> 1), the first cooling pipe group 6 </ b> A ( It is determined that leakage of the seawater W, which is the cooling water 11, has occurred in any of the cooling pipes 6 constituting the configuration (see FIG. 2).
In this case, the hydrous sawdust 16 is fed into the seawater W as the cooling water 11 from the hydrous sawdust throwing portion 15 formed on the upstream side of the cooling water feed pump 13 in the water channel 12 shown in FIG. 1 (step S2). .
Thereby, the sawdust thrown into the cooling water 11 flowing in the water channel 12 is agitated by the cooling water feed pump 13 and dispersed in the cooling water 11, and the cooling water 11 in which sawdust is dispersed and mixed is shown in the previous figure. When flowing in all the cooling pipes 6 constituting the first cooling pipe group 6A shown in 1 and 2, sawdust is cooled together with the seawater W in the small holes formed in the cooling pipe 6 as described above. The small hole which was attracted | sucked to the chamber 2a side and produced in the cooling pipe 6 with sawdust is block | closed, and the leakage of the seawater W stops.
Then, when the leakage of the seawater W stops, as shown in FIG. 3, the electrical conductivity measured in the salt detector 8 shown in FIGS. 1 and 2 starts to decrease (step S3). And by confirming the fall of this electrical conductivity, the emergency treatment method 20 at the time of the condenser condenser pipe leak which concerns on this Embodiment is completed.

  In some cases, the leakage of the seawater W from the cooling pipe 6 may not stop just by introducing the hydrous sawdust 16 into the cooling water 11 once. In this case, it is only necessary to repeatedly put the hydrous sawdust 16 into the cooling water 11 until a decrease in the electrical conductivity is confirmed in the salt detection device 8 (step S3).

Moreover, in the emergency measure method 20 at the time of the condenser condenser pipe leak which concerns on this Embodiment, the water-containing sawdust 16 which absorbed the water | moisture content beforehand as the sawdust thrown into the water channel 12 is used.
In general, sawdust is dry and lightweight, and its specific gravity is also lighter than water, so if it is simply put into water, it will not easily diffuse into the cooling water 11, and sawdust will float on the surface of the cooling water 11, or Sawdust is supplied to the cooling pipe 6 without being dispersed. This means that sawdust is not evenly supplied to the cooling pipes 6 constituting either the first cooling pipe group 6A or the second cooling pipe group 6B.
In this case, the effect of repairing the small holes by sawdust is not exhibited evenly in each cooling pipe 6 constituting either the first cooling pipe group 6A or the second cooling pipe group 6B.
On the other hand, when water is previously absorbed into sawdust, the hydrophilicity and dispersibility of sawdust in the cooling water 11 are increased, and thus when the hydrous sawdust 16 is introduced into the cooling water 11, Sawdust can be smoothly dispersed and the concentration thereof can be made uniform.
In addition, when sawdust is used particularly for closing small holes generated in the cooling pipe 6, since sawdust is an organic substance having biodegradability, the system remains in a state where sawdust is dispersed in the seawater W as the cooling water 11. There is a merit that it can be released outside (to the ocean).

Next, the preparation procedure of the above hydrous sawdust 16 will be described in detail with reference to FIGS.
FIG. 4 is a flowchart showing a procedure for preparing hydrous sawdust used in the emergency treatment method when a condenser condenser pipe leaks according to an embodiment of the present invention. Moreover, FIG. 5 is a conceptual diagram which shows the preparation situation of the water-containing sawdust used in the emergency treatment method at the time of the condenser condenser pipe leak which concerns on embodiment of this invention. The same parts as those described in FIGS. 1 to 3 are denoted by the same reference numerals, and description of the configuration is omitted.
In order to adjust the water-containing sawdust 16 used in the emergency treatment method 20 at the time of the condenser condenser pipe leakage according to the present embodiment, water (any of seawater, fresh water, brackish water may be used) as shown in FIG. Sawdust is prepared (step S21).
Subsequently, for example, as shown in FIG. 5, sawdust 23 is accommodated in a container 22 having an opening at the top, and water 24 is poured into the sawdust 23, for example, using a stirring device 25 or the like, or, for example, By manually stirring by using a scoop or the like, the sawdust 23 absorbs the water 24 and fully adjusts (see step S22, FIG. 4).
Thereafter, sawdust 23 (hydrated sawdust 16) having sufficiently absorbed water 24 may be rounded by hand and formed into a solid form (see step S23, FIG. 4). At this time, the size of the formed water-containing sawdust 16 is preferably about the size of a fist of a human hand.
In addition, when the water-containing sawdust 16 cannot be formed into a solid shape well, the sawdust 23 (water-containing sawdust 16) that has absorbed the water 24 may not be formed and may be poured into the cooling water 11 as it is.
In addition, a series of procedures from the above steps S21 to S22 or steps S21 to S23 is the hydrous sawdust creation procedure 21.

In addition, when the water-containing sawdust 16 is formed into a solid shape as shown in FIG. 1 and put into the cooling water 11 flowing through the water channel 12, the water-containing sawdust 16 has a sufficient weight as one lump. The hydrous sawdust 16 can reach the middle of the depth of the cooling water 11 flowing through the water channel 12.
In this case, it reaches the middle of the water depth by the rotating body 14 (water flow generating part) of the cooling water feed pump 13 disposed downstream of the charging position of the solid hydrous sawdust 16 (hydrous sawdust input part 15). The water-containing sawdust 16 can be crushed and uniformly dispersed in the cooling water 11. The form of the rotator 14 (water flow generation unit) is not particularly limited to that shown in FIG. 1, and a screw other than that shown in FIG. 1 can be used as long as the water flow can be generated.
Thus, since the cooling water feed pump 13 includes the rotating body 14, the dispersibility of the sawdust 23 in the cooling water 11 can be significantly improved.
And the sawdust 23 is uniformly disperse | distributed in the cooling water 11, and the cooling water 11 (seawater W) with which the sawdust 23 was mixed is individual which comprises 6A of 1st cooling pipe groups or the 2nd cooling pipe group 6B. The amount of sawdust 23 flowing through the individual cooling pipes 6 when flowing through the cooling pipes 6 can be made uniform.
As a result, the same level of repair effect can be exhibited in any of the cooling pipes 6 constituting the first cooling pipe group 6A or the second cooling pipe group 6B.
Therefore, the high repair effect of the cooling pipe 6 by sawdust 23 can be exhibited while reducing the amount and the number of times of insertion of hydrous sawdust 16.
FIG. 6 is an image showing an example of solid water-containing sawdust used in the emergency treatment method when the condenser condenser pipe leaks according to the embodiment of the present invention.
As shown in FIG. 6, the sawdust 23 that has sufficiently absorbed water can be easily formed into a ball shape by simply grasping and solidifying it with the hand in the manner of making handgrip rice.

Here, the sawdust 23 used in the emergency treatment method 20 when the condenser condenser pipe leaks according to the present embodiment will be described with reference to FIG.
FIG. 7 is an image showing an example of sawdust used in the emergency treatment method when the condenser condenser pipe leaks according to the embodiment of the present invention.
As shown in FIG. 7, sawdust 23 used in the emergency treatment method 20 when a condenser condenser pipe leaks according to the present embodiment includes at least 50% of particles whose particle length is in the range of 1 to 5 mm. Is.
Sawdust 23 having a particle length within the range of 1 to 5 mm as shown in FIG. 7 is optimal for repairing small holes generated in the cooling pipe 6.
Further, the shape of the sawdust 23 is not particularly required to be uniform, and may be granular, needle-shaped, or flat-shaped as shown in FIG. It is desirable to be within the range of 1-5 mm.
This is because when the particle length of the sawdust 23 is smaller than 1 mm, the small holes generated in the cooling pipe 6 cannot be sufficiently blocked, and when the particle length of the sawdust 23 exceeds 5 mm, the sawdust 23 is removed. This is because the water pressure of the cooling water 11 to be pushed away overcomes the suction force of the sawdust 23 generated in the small holes generated in the cooling pipe 6, and the small holes cannot be suitably closed by the sawdust 23.

Moreover, when the hydrous sawdust 16 is thrown into the cooling water 11 from the hydrous sawdust throwing-in part 15 shown in FIG. 1, it is desirable to put in a desired amount of the hydrous sawdust 16 all at once.
In this case, an area containing locally high-concentrated sawdust 23 can be generated in the flow of the cooling water 11.
Thereby, the repair effect by the sawdust 23 of the leaking cooling pipe 6 when the sawdust 23 (hydrous sawdust 16) dispersed in the cooling water 11 passes through the cooling pipe 6 can be enhanced.
Therefore, the repair effect of the leak cooling pipe 6 by sawdust 23 can be enhanced while reducing the number of sawdust 23 injections by putting together a desired amount of hydrous sawdust 16 at a time.

Finally, the form of the water channel 12 according to the present embodiment will be described with reference to FIG.
FIG. 8A is a sectional view of a cooling water supply channel connected to the condenser, and FIG. 8B is a plan view of the cooling water supply channel. The same parts as those described in FIGS. 1 to 7 are denoted by the same reference numerals, and description of the configuration is omitted.
Fig.8 (a) is the elements on larger scale of the part relevant to the water channel 12 shown in previous FIG. 1, In FIG.8 (a), (b), the positional relationship of the facilities distribute | arranged in a horizontal direction mutually. It corresponds.
As shown in FIGS. 8A and 8B, the water channel 12 for supplying the seawater W, which is the cooling water 11, to the inlet side water chamber 3 of the condenser 1 (see FIG. 1) Branching into a first water passage 12A for supplying the cooling water 11 to the water supply pipe 9A (see FIG. 2) and a second water passage 12B for supplying the cooling water 11 to the second cooling water supply pipe 9B. May be.
In addition, the first and second water passages 12A and 12B described above may include first and second cooling water feed pumps 13A and 13B and first and second hydrous sawdust input portions 15A and 15B, respectively. .
In this case, if leakage occurs in any of the cooling pipes 6 belonging to the first cooling pipe group 6A in the tube nest 26 shown in FIG. 2, a desired amount is supplied to the first hydrous sawdust throwing portion 15A of the first water channel 12A. Water-containing sawdust 16 may be added.
Further, when leakage occurs in any of the cooling pipes 6 belonging to the second cooling pipe group 6B, a desired amount of wet sawdust 16 may be put into the second wet sawdust throwing-in part 15B of the second water channel 12B.

As described above, the first water channel 12A for supplying the cooling water 11 to the first cooling water supply pipe 9A (see FIG. 2) and the second water supply for supplying the cooling water 11 to the second cooling water supply pipe 9B. The water channel 12B is provided separately, and the first and second cooling water feed pumps 13A and 13B and the first and second hydrous sawdust charging portions 15A and 15B are provided in the respective cooling pipe groups. The hydrous sawdust 16 can be thrown into only the connected water channel. As a result, it becomes easy to adjust the concentration of sawdust 23 flowing in the cooling pipe 6 constituting the target cooling pipe group (for example, the first cooling pipe group 6A or the second cooling pipe group 6B).
In this case, the effect of repairing the leakage cooling pipe 6 due to sawdust 23 can be enhanced while minimizing the amount of sawdust 23 (hydrous sawdust 16) introduced into the cooling water 11.

  In addition, the standard of the amount of sawdust 23 thrown into the first water channel 12A or the second water channel 12B is, for example, that the cooling pipe 6 constituting the condenser 1 has an outer diameter of 25.4 mm and a wall thickness of 1. The length is 163,201 mm within the range of 24 to 1.245 mm, and the total number of the cooling pipes 6 constituting the first cooling pipe group 6A and the second cooling pipe group 6B is 14,400 to 20,128. If it is within the range, 10 to 13 L may be added as the amount of sawdust 23 in the dry state in one charging operation of hydrous sawdust 16 (see step S2 in FIG. 3).

1 and 8, from the cooling water feed pump 13 (first and second cooling water feed pumps 13A and 13B), the hydrous sawdust throwing portion 15 (first and second hydrous sawdust throwing portions 15A and 15B). The distance P is preferably set in the range of 40 to 50 m.
In this case, the hydrous sawdust 16 input from the hydrous sawdust input unit 15 (first and second hydrous sawdust input units 15A and 15B) sinks to the middle of the water depth of the water channel 12 (first and second water channels 12A and 12B). It is possible to reach the rotating body 14 of the cooling water feed pump 13 (first and second cooling water feed pumps 13A and 13B) at the timing, and the stirring effect of the water-containing sawdust 16 by the cooling water feed pump 13 is achieved. It becomes possible to use it to the maximum extent.
In particular, by making the hydrous sawdust 16 the size of a human fist, this effect can be more reliably exhibited.
In this case, since the stirring and homogenization of the water-containing sawdust 16 (sawdust 23) by the cooling water feed pump 13 (first and second cooling water feed pumps 13A and 13B) are promoted, the first cooling pipe group 6A or The density | concentration of the sawdust 23 in the cooling water 11 which flows through the inside of each cooling pipe 6 which comprises the 2nd cooling pipe group 6B can be equalized rapidly.
As a result, the repair effect by sawdust 23 can be made equal in any cooling pipe 6 constituting the first cooling pipe group 6A or the second cooling pipe group 6B.

In the present embodiment, the case where the tube nest 26 of the condenser 1 includes the first cooling tube group 6A and the second cooling tube group 6B is described as an example. May be constituted by one cooling group, and the tube nest 26 may be constituted by two or more cooling tube groups.
In the former case, it is not necessary to branch the water channel 12 for supplying the cooling water 11 as shown in FIG.
In the latter case, the water passage 12 for supplying the cooling water 11 is branched into a number corresponding to the number of cooling pipe groups constituting the tube nest 26, and the cooling water feed pump 13 is branched into each branch passage. And the water-containing sawdust throwing-in part 15 should just be provided.

  As described above, the present invention can be applied to any cooling pipe constituting the cooling pipe group when leakage of cooling water occurs in any of the cooling pipes constituting the intended cooling pipe group of the condenser. This is an emergency treatment method for leaking condenser condenser pipes that can exhibit the same repair effect, and can be used in the technical field related to facilities and maintenance of thermal power plants and nuclear power plants.

  DESCRIPTION OF SYMBOLS 1 ... Condenser 2 ... Body part 2a ... Cooling chamber 3 ... Entrance side water chamber 3A ... 1st entrance side water chamber 3B ... 2nd entrance side water chamber 4 ... Exit side water chamber 4A ... 1st exit side water chamber 4B 2nd outlet side water chamber 5 ... Tube plate 6 ... Cooling tube 6A ... 1st cooling tube group 6B ... 2nd cooling tube group 7a ... Condensate retention part 7b ... Condenser outlet 8 ... Salt detection device 9 ... Cooling water Supply pipe 9A ... 1st cooling water supply pipe 9B ... 2nd cooling water supply pipe 10 ... Cooling water discharge pipe 10A ... 1st cooling water discharge pipe 10B ... 2nd cooling water discharge pipe 11 ... Cooling water (seawater W) 12 ... Water channel 12A ... 1st water channel 12B ... 2nd water channel 13 ... Cooling water feed pump 13A ... 1st cooling water feed pump 13B ... 2nd cooling water feed pump 14 ... Rotating body 15 ... Hydrous sawdust input part 15A ... 1st Hydrous sawdust input part 15B ... Second hydrous sawdust input part 16 ... Hydrous sawdust 1 ... Steam 18 ... Steam turbine exhaust 19 ... Condensate 20 ... Emergency treatment method when condenser condenser leaks 21 ... Water-containing sawdust preparation procedure 22 ... Vessel 23 ... Sawdust 24 ... Water 25 ... Agitator 26 ... Nest 27 ... Cooling water supply valve 28 ... Cooling water supply valve 29 ... Partition plate

Claims (5)

When an increase in electrical conductivity measured by the salt detector installed in the condenser water chamber occurs, sawdust is added to the cooling water, and the sawdust is observed in the small holes formed in the cooling pipe. In the emergency treatment method at the time of leakage of the condenser cooling pipe that temporarily stops leakage of the cooling water from the cooling pipe by clogging,
The sawdust added to the cooling water is hydrous sawdust that has previously absorbed moisture,
An emergency treatment method at the time of leakage of a condenser cooling pipe, wherein the water-containing sawdust is introduced into the cooling water on the upstream side of a cooling water feed pump disposed on the upstream side of the cooling water supply pipe.   2. The emergency treatment method for leaking condenser condenser pipes according to claim 1, wherein the water-containing sawdust is formed in a solid form.   The said cooling water feed pump is provided with a rotary body, and stirs the said cooling water in a water channel, The emergency treatment method at the time of the condenser condenser tube leak of Claim 1 or Claim 2 characterized by the above-mentioned.   The condenser cooling pipe according to any one of claims 1 to 3, wherein the sawdust has a content of particles having a particle length in a range of 1 to 5 mm of 50% or more. First-aid measures for leakage.   The emergency treatment method at the time of a condenser condenser pipe leak according to any one of claims 1 to 4, wherein a desired amount of the water-containing sawdust is poured into the cooling water at a time.