JP2001201272A - Condenser and method of assembling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the construction period at the time of exchanging the condenser tube or tube bundle of a condenser with another, by enabling tube bundles to be carried out easily from and into a drawing space at exchanging of the tube bundles with each other, even when an obstacle exists in the carry-in/carry-out route of the tube bundles. SOLUTION: A condenser tube bundle, carried in the body barrel 1 of the condenser, is divided into a plurality of short unit tube bundles 23 and 23, and the bundles 23 and 23 are attached separably to each other by means of connecting plates 25 fitted to one ends of the bundles 23 and 23. Tube plates 24, fitted to the other ends of the bundles 23 and 23, are respectively fixed to water boxes 8a and 8b. Consequently, the construction period can be shortened at the time of exchanging the condenser tube 2 of the condenser with another by making difficult work easier, because the carrying work of the tube 2 out from and in the drawing space becomes possible, even if an obstacle exists in a building from and in which the tube 2 is carried or an carry-out/carry-in opening is limited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condenser for facilitating replacement of a cooling pipe or a tube bundle incorporated in a main body of a condenser installed in a power plant, and a method of assembling the condenser.

[0002]

2. Description of the Related Art As shown in FIG. 11, a condenser installed in a thermal power plant or a nuclear power plant, for example, has tube plates 3a and 3b holding a large number of thin tubular cooling tubes 2 in a main body 1 thereof. The expansion joint 5 is provided on at least one between the tube plates 3a, 3b and the body end plates 4a, 4b.

The main body 1 has an inlet-side water chamber 8a and an outlet-side water chamber 8 comprising water chamber bodies 6a and 6b and water chamber lids 7a and 7b.
b so as to sandwich the tube sheets 3a and 3b.
a, 9b and the body trunk side flanges 10a, 10b. A cooling water inlet account 11a is provided at a lower end of the inlet side water chamber 8a, and a cooling water outlet account 11b is provided at a lower end of the outlet side water chamber 8b.

In the condenser having the above-described structure, the steam discharged from the steam turbine after finishing the work flows into the main body 1 through the steam inlet 12, while flowing into the inlet side water chamber 8a from the cooling water charging account 11a. After passing through the cooling pipe 2, it reaches the outlet side water chamber 8b, and is returned from the cooling water outlet account 11b to a water source or the like. During this time,
The steam is deprived of latent heat by the cooling water via the cooling pipe 2, condenses and condenses, and flows out from the condensate outlet 13 as condensate.

FIG. 12 (a) is an enlarged view of an example of a long tube bundle 14 in which a number of cooling tubes 2 incorporated in the main body 1 of the condenser in FIG. 11 are attached to tube sheets 3a and 3b and integrated. FIG. 12 (b) shows a side view from the inlet side tube sheet 3a of FIG. 12 (a).

In general, in a nuclear power plant, exhaust steam of a low-pressure turbine is cooled and condensed by a condenser, and the condensed condensate is sent to a nuclear reactor or the like. Seawater is used as cooling water, and the seawater flows in the cooling pipe 2 and returns to the sea. These turbines and condensers are arranged in a turbine building 15 of a reinforced concrete building, for example, as shown in FIGS.

FIG. 14 is a sectional view taken along the line AA of FIG. 13, and FIG. 13 schematically shows a turbine building 15 in a partial view.
15 schematically shows an example in which three condensers A, B, and C are arranged in 15. In FIG. 13, reference numeral 16 denotes a front or rear side outer wall, 17 denotes an inner wall, 18 denotes a device, and a bold arrow denotes a unit tube bundle carrying-in / out system according to the present invention described later. In FIG. 14, reference numeral 19 is a ceiling wall, 20 is a floor, 21 is a side outer wall,
Reference numeral 22 denotes a block wall.

[0008]

In the long-term operation of a nuclear power plant, replacement of large installation equipment due to aging deterioration occurs frequently. However, there is also a need to increase the capacity of power generation equipment. is there. Condensers also correspond to these aged equipment and large equipment that needs to be replaced to increase capacity.

The tube bundle 14 in the condenser is shown in FIG.
As shown in (b), a cooling pipe assembly in which both ends of a large number of long cooling pipes 2 are bound by a pair of tube sheets 3a and 3b. Figure 14
The cooling pipe 2 is taken in from the cooling pipe carrying block wall 22 shown in FIG. When the entire tube bundle 14 is replaced due to an increase in the capacity of the plant or the like, as shown in FIG.
A rectangular frame opening 26 of about 5 m to 8 m is provided in 21 and a tube bundle is carried in and out by a crane truck 27. .

However, the ceiling wall 19 and the side outer wall 21
Even if one skeleton opening 26 is provided in the turbine, the inner wall 17 and the equipment 18 installed in the turbine building 15 are obstacles, so the condenser cooling pipe of the condenser installed adjacent to the tube bundle 14 It is difficult to move to the second extraction space. In addition, the opening 26 of the skeleton is often restricted by the arrangement state of the inner wall 17 and the devices 18, and it is difficult to carry in and out the long tube bundle 14.

Therefore, there is a problem that the replacement of the cooling pipe 2 or the tube bundle 14 is a large-scale and time-consuming work. Further, the tube bundle 14 cannot be replaced, or even if the tube bundle 14 can be replaced, interference with other devices 18 and the block wall 22 etc. occurs, and removal of those devices 18 and the block wall 22 etc.
There is a large amount of construction work, such as the need for restoration work, and problems with long-term construction work.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can reduce the amount of work and the work period, and can cope with an increase in capacity by replacing a cooling pipe or a tube bundle. And a method for assembling the condenser.

[0013]

According to a first aspect of the present invention, there is provided a main body and a plurality of cooling pipes assembled between water chambers at both ends of the main body, and both ends are formed by tube sheets. In a condenser including a fixed tube bundle and an inlet water chamber and an outlet water chamber provided on the tube plate side, the tube bundle has a unit in which both ends of a plurality of cooling pipes are fixed by a tube plate and a connection plate. It is characterized by having a structure in which a plurality of unit tube bundles are connected so as to be splittable and integrated.

According to the present invention, a long tube bundle is unitized into a short unit tube bundle, so that the unit tube bundle can be easily carried in and out in a narrow place even if an obstacle or the like is installed. In addition, it is possible to easily replace the unit tube bundle or its cooling tube, and to reduce the amount of work and shorten the work period.

According to a second aspect of the present invention, in the unit tube bundle, a tube plate is attached to one end of the plurality of cooling pipes, and a connection plate is attached to the other end of the plurality of cooling pipes. The connecting plates of the tube bundle and the other unit tube bundle are connected and integrated, and a space is provided between the connecting plates to form a water chamber in which the cooling pipes facing the space communicate with each other.

According to the present invention, since the space is provided between the connection plates to form a water chamber, when the pair of unit tube bundles are connected via the connection plate, the center portions of the cooling pipes do not coincide with each other. In both cases, the seawater of the cooling water can sufficiently flow into the cooling pipes of the adjacent unit pipe bundle via the water chamber.

The invention corresponding to claim 3 is characterized in that a tube support plate is provided on at least a part of a connection portion between the connection plate and another connection plate of the unit tube bundle. According to the present invention, by adjusting the connection plate of the unit tube bundle to the installation pitch of the tube support plate, a part of the tube support plate can be formed, and the heat transfer area can be effectively used. Also, there is no need to provide a pipe support plate near the connection plate, and the connection plate can have the function of a tube support plate.

According to a fourth aspect of the present invention, in a method for assembling a condenser by incorporating the unit tube bundle according to any one of the first to third aspects into the main body, the condenser is assembled into the main body. The connection between the connection plates of the plurality of unit tube bundles is connected by welding.

According to this invention, by connecting the connection plates of the unit tube bundle and the adjacent unit tube bundle to each other in a welded structure, when the turbine exhaust steam is condensed and condensed and sent to a nuclear reactor or the like, the water in the cooling tube is removed. It is possible to prevent seawater from leaking from the joint between the unit tube sheets and entering the condensate.

Further, in the conventional example, it is difficult to secure a maintenance work space in a narrow place in the building where the condenser is installed or in the body of the main body, and the connection portion has a flange structure and requires maintenance. The invention eliminates maintenance. further,
In the conventional example, when a gap is formed between the connection plates, the corrosion of the gap is caused. However, in the present invention, the corrosion of the gap can be prevented by performing the electrolytic protection.

According to a fifth aspect of the present invention, in a method for assembling a condenser by incorporating the unit tube bundle according to any one of the first to third aspects into the main body, the condenser is assembled into the main body. The connection plate of the unit tube bundle and the periphery of the cooling pipe are connected by welding.

According to this invention, the unit pipe bundle and the cooling pipe have a welded structure as in the invention of the fourth aspect,
It is possible to prevent seawater flowing in the cooling pipe from leaking from between the connection plate and entering the exhaust steam side of the turbine, thereby preventing seawater from flowing into the reactor.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a condenser according to the present invention will be described with reference to FIGS. 1, 2 (a) and 2 (b).
1 and 2 (a) and 2 (b), the same portions as those in FIG. 11 or portions having similar functions are denoted by the same reference numerals, and description of overlapping portions will be omitted. That is, the present embodiment is different from FIG.
As shown in the figure, two short unitized unit tube bundles 23 are arranged in series in the main body 1 of the condenser, and a connecting plate 25 is provided.
The condensers are connected and integrated, and the tube sheet 24 is assembled and fixed in the inlet water chamber 8a and the outlet water chamber 8b to constitute a condenser.

The length of the unit tube bundle 23 is about half of the conventional example as a whole. That is, FIG.
As shown in (b), the cooling pipe 2 is approximately 略 of the conventional length.
Is a short cooling pipe having a length of
Of the unit tube bundle 23
Is composed. The unit tube bundle 23 of the present embodiment has a length that is approximately half the length of the conventional tube bundle 14.

The unit tube bundle 23 is lighter in weight than the conventional tube bundle 14, and can be easily connected by the connecting plate 25 or divided and disassembled. In addition, it is easy to assemble the unit into the main body 1, assemble the unit, carry it in and out, and also to easily pull out the integrated unit tube bundle. Therefore, according to the present embodiment, it is possible to minimize interference with other devices and buildings when carrying in and out the unit tube bundle, thereby shortening the construction period or facilitating the construction work.

Next, the operation of replacing the condenser tube bundle of this embodiment and the conventional example will be compared with FIG. In FIG. 3, the upper part shows an example of loading and unloading of the conventional tube bundle, the lower part shows an example of loading and unloading of the unit tube bundle of the present embodiment as an example of the present invention, and the center left side shows the inside of the turbine building 15 (see FIGS. 13 and 14). The right side shows the completed state after the tube bundle is inserted and replaced, before the tube bundle is replaced.

The major difference between the present invention and the conventional example is that the existing tube bundle 14 or the existing unit tube bundle 23 is pulled out and the new tube bundle 14 or the new unit tube bundle 23 is carried in and out. It is only necessary to provide the skeleton openings 26 at the locations indicated by medium hatching, whereas in the conventional example, the large skeleton openings 26 must be provided not only on the ceiling wall 19 but also on the outer wall 21.

The tube bundle 14 or the unit bundle 23 is a crane truck
27, the unit tube bundle 23 according to the present embodiment is 1/2 of the length L of the conventional tube bundle 14.
, Crane truck
The movement range at 27 is small, and as a result, the unit tube bundle
The handling and replacement work of 23 becomes easy.

Further, in the loading / unloading process of the new unit tube bundle 23, since the frame opening 26 provided in the turbine building 15 can be made smaller than in the conventional example, it is possible to remove the interfering object and reduce the amount of the restored material. In addition, as indicated by the thick arrow in FIG. 13, the unit tube bundle 23 can be more easily moved in a narrow place in the turbine building 15, and thus there is an effect of shortening the process in the improvement work.

According to the present embodiment, however, the unit tube bundle 23 is smaller and lighter than the conventional example, so that the operation of replacing and handling the tube bundle 23 becomes easier, and interference with other devices is prevented. There is no need to remove and restore equipment and the like, and the construction period can be shortened in conjunction with the reduction in the amount of construction.

Next, a condenser according to a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the unit tube bundle 23 in the first embodiment shown in FIG. 2 is further subdivided as shown in FIG.
It is an object of the present invention to provide a tube bundle having the same length as that of the conventional example by integrally connecting four unit tube bundles 23a in series.
Other parts are the same as in the first embodiment.

A tube plate 24 is attached to the cooling tube 2 of the unit tube bundle 23a on the water chamber side, and a connection plate 25 is attached to the other end of the cooling tube 2. The connection plates 25 are connected to each other to form a tube bundle having the same length as the conventional example.

According to the present embodiment, as shown in FIG. 4, four unit tube bundles 23a each having a shorter length than the length of the unit tube bundle 23 in the first embodiment are further reduced to 1/2. As a result, there are obstacles to the loading and unloading in the turbine building 15, and even if there is a restriction on the frame opening 26, the cooling pipe 2 can be loaded and unloaded into and out of the space, which has been difficult. The construction period can be shortened. The number of unit tube bundles is not particularly limited, and the number can be arbitrarily selected depending on the form of the condenser.

Next, a first embodiment of a method for assembling a condenser according to the present invention will be described with reference to FIGS. In this embodiment, another unit tube bundle 23 or 23 adjacent to the unit tube bundle 23 or 23a in the first or second embodiment is used.
Instead of providing a flange between the connection plates 25 and 25 in 23a and integrating them by bolting, as shown in FIG. 5, the connection plates 25 and 25 are integrated by welding 28 around the entire mating surface. It is in.

Further, as shown in FIG. 6, the entire periphery of the connecting portion between the connecting plate 25 and the cooling pipe 2 is connected by welding 28. Although only one cooling pipe 2 is shown in FIG. 6 to avoid complexity, a large number of cooling pipes are actually provided as shown in FIG.

According to the present embodiment, since the turbine exhaust steam is condensed and condensed to be condensed and sent to a nuclear reactor or the like, the seawater in the cooling pipe 2 is conveyed to another unit pipe bundle 23 adjacent to the unit pipe sheet 23. From the connecting portion of the connecting plates 25, 25 or the connecting portion between the connecting plate 25 and the cooling pipe 2 to be mixed into the condensed water.

Further, even if it is difficult to secure a maintenance work space in a narrow place in the condenser body 1, there is an effect that maintenance is not required as compared with the flange connection structure. further,
The formation of a gap between the connection plates 25, 25 causes corrosion of the gap. However, the above cause can be eliminated by using the electrolytic protection together.

Next, a third embodiment of the condenser according to the present invention will be described with reference to FIGS. 7 (a) and 7 (b). This embodiment is a unit tube bundle according to the first or second embodiment.
Another unit tube bundle 23 or 23a adjacent to 23 or 23a
In this embodiment, an elongated space is provided between the connection plates 25, 25, and the space is used as a water chamber 29.

That is, a surface where the connection plates 25 face each other, that is, a connection plate where all the cooling pipes 2 face each other.
Recesses are engraved on each of the 25 surfaces, and these concave portions and the surfaces on which the concave portions are formed face each other and are closely attached to each other to form an elongated narrow space. The space can be an elongated narrow water chamber 29.

Next, the effect of providing the water chamber 29 will be described. In the case where the water chamber 29 is not provided, when the unit pipe bundles are connected to each other by the connection plates 25, 25, the center of the opposed one cooling pipe 2 and the other cooling pipe 2 may be shifted from each other. If the center is shifted, the resistance that hinders the passage of the cooling water increases, and the amount of the cooling water decreases, resulting in incompatibility.

In order to solve this problem, the water chamber 29 is located within a range in which a large number of cooling pipes 2 are located between the connection plates 25 and 25 and face each other.
Is provided, even if the centers of the opposed cooling pipes 2 are shifted, the flow of the cooling water is not hindered, and a sufficient amount of the cooling water can be secured.

According to the present embodiment, when the position of the cooling pipe 2 attached to the connection plate 25 adjacent to the other connection plate 25 is shifted, sufficient cooling water can flow through the cooling pipe 2.
Therefore, the connection work between the unit tube bundles 23 or 23a can be easily performed without making the mounting accuracy of the cooling pipe 2 to the connection plate 25 strict.

Next, a fourth embodiment of the condenser according to the present invention will be described with reference to FIGS. 8, 9 and 10. FIG. 8 is an exploded view of the condenser according to the present embodiment. In FIG. 8, the same reference numerals are given to the same portions as FIG. 11 or portions having similar functions. FIG. 9 shows the connecting plate 25 of the tube bundle in the main body 1 in FIG.
FIG. 10 shows the relationship between the tube support plate 30 and the cooling pipes in FIG. The description of the same parts or parts having the same functions as those of the conventional example will be omitted.

That is, in this embodiment, the connection plate 25 of the tube bundle is used.
When the cooling pipe 2 is arranged via a plurality of pipe support plates 30 in the main body 1 as shown in FIG. By arranging the connection plate 25 at the position of the tube support plate 30 as shown in FIG. 10, the tube support plate 30 is provided with a large number of through holes for inserting and supporting the cooling pipe 2 as shown in FIG. Have been.

FIGS. 8 and 10 show a state in which only one cooling pipe 2 is inserted into the pipe support plate 30 to avoid complexity. The pipe support plate 30 has through holes as many as the number of the cooling pipes 2, and a large number of pipe support plates 30 are provided between the inlet-side water chamber 8 a and the outlet-side water chamber 8 b to support the elongated cooling pipe 2. The pipe support plate 30 is connected to the main body 1, and the cooling pipe 2 is supported from the main body 1 via the pipe support plate 30.

According to the present embodiment, there is no need to provide a tube support plate near the connection plate, and the connection plate 25 provided on the tube bundle is not required.
Can be used as the tube support plate 30, and a reduction in the heat transfer area due to the thickness of the connection plate 25 can be prevented. Although the conventional tube bundle 14 is provided with several tube support plates 30 for supporting the cooling tubes 2, the number of tubes can be reduced to reduce the weight of the tube bundle.

[0047]

According to the condenser according to the present invention, a long tube bundle is unitized to form a unit tube bundle that is short and lightweight, and these are unitarily connected in series so as to be able to be divided into a plurality of units, thereby narrowing the space. Carrying in is easy even in a place. Therefore, since the integrated tube bundle can be divided into small unit tube bundles, interference with other devices and buildings can be minimized,
The construction period can be shortened and the replacement work of the tube bundle can be facilitated.

According to the condenser assembling method of the present invention,
By connecting and assembling the entire circumference of the connection plate of the unit tube bundle or the entire circumference of the connection surface between the connection plate and the cooling pipe by welding, it is possible to prevent seawater from entering the condensate and to mix the cooling water. There is an effect that maintenance of the joint is not required as compared with the connection of the structure.

[Brief description of the drawings]

FIG. 1 is a schematic front view for explaining a first embodiment of a condenser according to the present invention.

2 (a) is a front view showing a short unit tube bundle in FIG. 1, and FIG. 2 (b) is a side view as viewed from the tube sheet side of FIG. 2 (a).

FIG. 3 is a flowchart illustrating a method of replacing a tube bundle according to the first embodiment and a conventional example.

FIG. 4 is a front view showing an integrated unit tube bundle in a second embodiment of the condenser according to the present invention.

FIG. 5 (a) shows a first method of assembling a condenser according to the present invention.
FIG. 2B is a longitudinal sectional view for explaining the embodiment, and FIG. 2B is a side view seen from the connection plate side in FIG.

FIG. 6 is a longitudinal sectional view showing a state where a cooling pipe is welded to the connection plate in FIG. 5 (a).

7A is a longitudinal sectional view showing a main part of a third embodiment of the condenser according to the present invention, and FIG. 7B is a side view as seen from the connection plate side of FIG.

FIG. 8 is an exploded view for explaining a condenser according to a fourth embodiment of the present invention.

FIG. 9 is a front view schematically showing an arrangement state of a connection plate, a tube support plate, and a cooling pipe of the tube bundle in FIG. 8;

FIG. 10 is a perspective view showing a state where cooling tubes are inserted into the tube support plate in FIG. 9;

FIG. 11 is a longitudinal sectional view schematically showing a conventional general condenser.

12 (a) is a front view showing the long tube bundle in FIG. 11, and FIG. 12 (b) is a side view as viewed from the inlet side tube sheet of FIG.

FIG. 13 is a plan view showing an example in which three condensers are arranged in a turbine building.

14 is a longitudinal sectional view cut along the direction of arrows AA in FIG. 13;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body trunk, 2 ... Cooling pipe, 3a, 3b ... Tube sheet, 4a, 4
b: body end plate, 5: expansion joint, 6a, 6b: water chamber body,
7a, 7b: water chamber lid, 8a: inlet side water chamber, 8b: outlet side water chamber, 9a, 9b: water chamber side flange, 10a, 10b: main body side flange, 11a: cooling water account, 11b ... cooling Water account, 12… Steam inlet, 13… Condensate outlet, 14… Tube bundle (conventional example), 15… Turbine building, 16… Front and rear side outer wall, 17… Inner wall, 18… Equipment, 19… Ceiling wall, 20… Floor, 21 ... side outer wall,
22: block wall, 23, 23a: unit tube bundle, 24: tube sheet,
25 ... connection plate, 26 ... frame opening, 27 ... crane truck, 28 ... welded part, 29 ... water chamber, 30 ... pipe support plate.

Claims (5)

[Claims] 1. A body bundle, a plurality of cooling pipes assembled between water chambers at both ends of the body body, and a tube bundle having both ends fixed by a tube sheet, and provided on the tube sheet side. In a condenser including an inlet water chamber and an outlet water chamber, the pipe bundle is configured to divide and connect a plurality of unit pipe bundles in which both ends of a plurality of cooling pipes are fixed by a pipe plate and a connection plate to form a unit. A condenser characterized by having an integrated structure. 2. The unit tube bundle has a tube plate attached to one end of the plurality of cooling tubes, a connection plate attached to the other end of the plurality of cooling tubes, and a unit tube bundle and another unit tube bundle. The connection plates are connected to each other and integrated,
The condenser according to claim 1, wherein a space is provided between the connection plates to form a water chamber in which the cooling pipes facing the space communicate with each other. 3. The condenser according to claim 1, wherein a pipe support plate is provided on at least a part of a connection portion between the connection plate and another connection plate of the unit tube bundle. 4. A method for assembling a condenser by incorporating the unit tube bundle according to claim 1 into the main body, and connecting the plurality of unit tube bundles to be incorporated into the main body. A method for assembling a condenser, wherein the peripheries of the plates are welded together. 5. A method for assembling a condenser by incorporating the unit tube bundle according to any one of claims 1 to 3 into the main body, wherein a connecting plate of the unit tube bundle incorporated in the main body is provided. A method for assembling a condenser, comprising welding and connecting a periphery of a cooling pipe.