JPS6142193B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condenser, and more particularly to a condenser structure for condensing turbine exhaust steam in a charging plant.

In this type of condenser, a large number of cooling tubes are arranged inside the condenser body, and both ends of these cooling tubes are connected to water chambers with a predetermined capacity placed on both sides, and one The cooling water such as seawater introduced into the water chamber is configured to flow through each tube and the cooling water is discharged to the outside from the other water chamber, and the exhaust steam introduced between each tube is condensed by heat exchange. It's summery.

Therefore, in the conventional condenser, each of the water chambers is attached to the outside of the side of the condenser body. These water chambers require a considerable volume and occupy most of the sides of the condenser body.

On the other hand, in recent power plants, piping equipment (number of pipes, pipe diameter, etc.) has increased due to performance and specification requirements, and as a result, the number of pipes connected to the condenser has also increased. There is a tendency to

However, since condensers in power plants are installed within the TG mount (turbine generator mount), there is a limit to the available surface area for piping connections. For this reason, the piping connection to the condenser has the disadvantage that it is difficult to design a route within a narrow range, and it is also difficult to work on-site.

As a means to solve this problem regarding space for connecting pipes, a method has been proposed in the past in which a flash box is provided and various pipes are collectively connected onto the flash box. However, even with this method, there is a limit to the size of the flash box, and it is impossible to connect all of the increasing number of various pipes.

The structure of a conventional condenser will be explained with reference to FIGS. 1 and 2.

In FIG. 1, a condenser upper shell is provided at the upper part of the condenser body, and exhaust steam from a turbine installed above is guided into the condenser body 2 through the upper shell 1. Water chambers 3, 3 are attached to the outside of both sides of the condenser body 2, respectively, and a large number of heat exchange tubes 5 extending inside the condenser body 2 are connected between these water chambers. .

Cooling water such as seawater is introduced into one of the water chambers 3 through the circulating water piping 11, and after passing through each of the tubes 5, is discharged from the other water chamber 3 to the outside through the circulating water piping 11. Each water chamber 3, 3 is provided with a manhole 4, 4 for internal inspection.

The condenser body 2 is installed on a floor 13 via a foundation 12.

Further, a hot well 10 is provided at the lower part of the condenser body 2 to collect the condensed water which has been cooled by the tube 5 and which has changed from steam to water and to lead it to the outside.

In the condenser shown in FIG. 1, there is a steam bypass pipe 8A connected to the upper shell of the condenser, and a bleed pipe 8B for extracting steam from each stage of the turbine.
Various types of piping 8 such as a heater drain pipe 8C for returning condensed water discharged from the condensation heater into the condenser are also connected thereto.

The condensed water discharged from the hot well 10 is supplied through the feedwater heaters of each stage by a condensate pump (not shown), and is fed into the boiler or reactor pressure vessel by a high pressure pump.

In the structure shown in FIG. 1, a feed water heater 9 is provided in the upper shell 1 of the condenser, and while water is taken in from an inlet 9A and circulated through an internal heat exchange tube 9B, a steam intake 9C is provided. The water is heated by high-temperature steam taken in from the outlet 9D, and the heated water is taken out from the outlet 9D. Condensed water that has changed from steam to water in the feed water heater 9 is discharged into the condenser body 2 through the heater drain pipe 8C. In the illustrated example, one end of the heater drain pipe 8C is connected to a flash box 6 provided on the side surface of the condenser body 2. The flash box 6 is provided with a plurality of connection ports 6A for connecting the heater drain pipe 8C and other pipes (steam bypass pipe 8A, extraction pipe 8B, etc.).

In the structure of the conventional condenser shown in FIG. 1, each of the water chambers 3, 3 is attached to the outside of the side surface of the condenser body 2, so that the various piping 8 can be connected. were limited in space. That is, it has been extremely difficult to cope with the trend of increasing the number of various types of piping (increasing the number and diameter of the pipes) due to the design requirements of power plants.

FIG. 2 is a diagram showing an example of the arrangement of a condenser (indicated by a condenser body 2) in a power generation plant. In Figure 2, three condensers 2 are installed in the T/G mount (turbine = generator mount), and each condenser 2
Since these T and G frames are provided on the sides of the condenser body, the usable area of the two sides of the condenser body is limited. Since the water chambers 3, 3 are installed in this limited area, the space for connecting the various pipes 8 becomes even more limited.

That is, in the case of a conventional condenser, the water chamber 3
were installed outside the condenser body 2, and as a result, it was extremely difficult to connect these pipings despite the increasing number of various types of piping, and the construction workability on site was poor.

It is an object of the present invention to overcome the above-mentioned drawbacks of the conventional technology and provide a condenser for a power generation plant that is easy to design piping routes even in response to the demand for increased piping and is easy to construct on-site. That's true.

A feature of the present invention is that the water chamber, which is conventionally attached to the outside of the side surface of the condenser body and occupies most of the surface,
By incorporating the condenser into the condenser body, the usable area of the condenser body surface is expanded and an increased number of pipes can be connected.

That is, according to the present invention, in a condenser that condenses turbine exhaust steam in a power generation plant,
Both ends of a plurality of cooling tubes arranged in the condenser conductor are connected to each other, and at least one of the water chambers on both sides that circulate cooling water to these tubes is installed in the condenser body. A condenser is provided that is characterized in that it is installed in a.

Furthermore, when a side stream system for condensate purification is installed in parallel with the condenser, it is preferable that a side stream tank and a control hotwell of the side stream system are also provided in the condenser body together with the water chamber.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 7.

3 to 5 are diagrams showing an embodiment of the present invention, and in these drawings, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In FIGS. 3 to 5, a water chamber 3 similar to the conventional one is attached to one side of the condenser body 2 (left side in FIG. 3). The water chamber on the other side is
It is moved inside the condenser body 2 and installed inside the body as a built-in water chamber 14.

A large number of heat exchange tubes 5 extending inside the condenser body 2 are connected between these water chambers 3 and the built-in water chamber 14, and seawater introduced into the water chamber 3 from the circulating water piping 11 is connected to the tubes 5 for heat exchange. Cooling water, etc., circulates within each tube 5 and passes through the built-in water chamber 14 to the circulating water piping 1 on the other side.
1 is discharged to the outside (into the ocean, etc.). A manhole 4 is provided in one of the water chambers 3, and a manhole 23 is provided at the position of the circulating water pipe 11 on the built-in water chamber 14 side.

A condenser upper body 1 is provided on the upper part of the condenser body 2, a hot well 10 for deriving condensed water is provided on the lower side of the condenser body 2, and the condenser body 2 is connected to the condenser body 2 via a foundation 12. It is the same as the conventional structure shown in FIG. 1 in that it is installed on the floor 13.

Thus, a large number of different arrangements 8 are connected to the available surfaces of the condenser body 2 and the condenser upper body 1. As mentioned above, these piping 8 are as follows.
It includes steam bypass pipe 8A, bleed pipe 8B from each stage of the turbine, large diameter pipes such as REP-T exhaust pipe (exhaust pipe of turbine for driving reactor feed water pump), and the above-mentioned heater drain pipe 8C. ing. Incidentally, a feed water heater 9 is attached to the condenser upper shell 1 as in the case of FIG. 1.

According to the structure shown in FIG. 3, the water chamber on one side is provided inside the condenser body and serves as the built-in water chamber 14, so one side (the right side in FIG. 3) is used to connect various piping 8. It can be used effectively. thus,
It is easy to design pipes according to the increasing trend of the number of various pipes and pipe diameters, and it is possible to improve the workability of pipe connection work on site.

4 and 5 are diagrams showing details of the internal structure of the condenser shown in FIG. 3. The built-in water chambers 14, 14 are fixed in a predetermined position by a support member 15, and a predetermined space is maintained between each built-in water chamber 14, 14 and the inner surface of the condenser body 2, and these spaces allow various piping 8 A flow path 16 is formed that communicates with the inside of the condenser. Therefore, the steam (including water) introduced from the various pipes 8 can be easily guided to the region of the tube 5 for heat exchange.

In FIG. 4, a predetermined level of pseudocondensation water exists in the lower part of the space 16 below each built-in water chamber 14. Further, the separated gas generated in the internal space of the piping group consisting of a large number of tubes 5 is, for example,
It is possible to exhaust the air to the outside from an air extraction pipe connected as one of the air extraction pipes.

In addition, in FIG. 3, it is also possible to move the water chamber on the left side into the condenser body 2 to form the built-in water chamber 14. By making all the water chambers 14 built-in, the usable area for piping connections can be further expanded. However, in order to maintain and inspect the group of tubes 5 for heat exchange, it is preferable to provide one of the water chambers outside so that the tubes 5 can be drawn out using the external water chamber 3.

FIGS. 6 and 7 are diagrams showing other embodiments of the present invention.

This embodiment has a built-in water chamber 1 as shown in FIG.
In addition to the above-mentioned various piping 8, a side stream tank 18 of a side stream system for condensate purification and a clean hot well 20 are incorporated in the expanded space available due to 4, and the other structures are as shown in Figure 3. This is substantially the same as the embodiment described with reference to FIG.

The configuration and operation of the side stream system will be explained with reference to FIG. In Figure 6, if the condensate coming out of the hot well 10 in the condenser water chamber contains a large amount of radioactive sludge, the condensate from the hot well 10 is purified to remove these sludge. There is a need.

Condensate from hot well 10 is condensate purification pipe 17
Through the purification circulation pump 23, condensate filtration device 2
4, the condensate is circulated to the condensate pipe 21 through the condensate desalination device 25, the heat exchanger 26, and the control valve 19. The condensate pipe 21 is for guiding purified condensate from the clean hot well 20 provided in the condenser body 2 to the condensate pump 22. Purified condensate from the condensate pump 22 is guided to a boiler, reactor pressure vessel, etc. via a feed water heater (not shown) or the like.

In order to purify the condensate even in the pipe where the pump 22 is stopped, or to constantly supply purified water (especially necessary in a nuclear reactor),
Since it is necessary to supply a sufficient amount of clean water at the same time as the condensate pump 22 starts driving, a side stream tank 18 having a sufficient volume for filling with water is provided in the side stream system. The control valve 19 is for adjusting the water level in the clean hot well 20.

As shown in FIG. 7, in the present invention, the built-in water chamber 1
4 is provided inside the condenser body 2, the side stream tank 18 and cleaning hot well 20 of the side stream system can be incorporated into the condenser body 2, and the condensate purification pipe 17 and the condensate pipe 21 are connected to them. can be connected. For this reason, in the conventional structure, it was necessary to separately install a large-capacity side stream tank, which required installation location and piping, and was expensive. can be configured.

As is clear from the above description, according to the present invention, a condenser for a power generation plant can be obtained in which the design of piping connections is easy and the conditions for piping construction in the field are improved. This means that condensers for power plants that can meet various performance and specification requirements can be easily realized.

[Brief explanation of the drawing]

Figure 1 is a partially sectional side view of a conventional condenser for a power generation plant, Figure 2 is a plan view showing the arrangement of condensers in a power generation plant, taking a conventional condenser as an example; 3 is a partially sectional side view showing an embodiment of a condenser for a power plant according to the present invention, FIG. 4 is a sectional view taken along the line - in FIG. 3, and FIG. 5 is a reproduction of FIG. 3. FIG. 6 is an explanatory diagram showing a side stream system for purifying condensate; FIG. 7 is an embodiment in which the present invention is applied to a condenser having a side stream system. FIG. 1... Condenser upper body, 2... Condenser body, 3...
...Water chamber, 5...Tube for heat exchange (for cooling), 6...Flush box, 8...Piping (various piping including steam bypass pipe 8A, bleed pipe 8B, heater drain pipe 8C, etc.), 9... Water supply heater, 10... Hot well, 11... Circulating water piping, 14... Built-in water chamber, 16... Space (flow path),
17... Condensate purification pipe, 18... Side stream tank, 20... Clean hot well, 21... Condensate pipe, 22... Condensate pump, 23... Purification circulation pump.

Claims (1)

[Claims] 1. In a condenser that condenses turbine exhaust steam in a power generation plant, the condenser is connected to both ends of a large number of cooling tubes arranged in the condenser body and circulates cooling water through these tubes. A condenser characterized in that at least one of the water chambers on both sides is installed within the condenser body. 2. In the condenser according to claim 1, a side stream system for condensate purification is attached to the condenser, and a side stream tank and a cleaning hot well of the side stream system are installed in the condenser body. A condenser characterized by providing: