JPS5811384A - Condenser - Google Patents

Abstract

PURPOSE:To reduce a tensile strength acting on cooling pipes by a method wherein the trunks of water chambers are secured to the end plates of the trunks of a main frame by reinforcing ribs and both end plates are connected by reinforcing pipes at the inside of the main frame to where the reinforcing ribs for the end plates of the trunks of the main frame are secured. CONSTITUTION:Distributed load W generated by a hydraulic pressure p in the water chamber is not transmitted to the cooling pipes 2 substantially and is transmitted to the reinforcing ribs 14a, 14b, 14c, 14d. The end plates 4a, 4b for the trunks of the main frame are connected by the reinforcing pipes or rods 15a, 15b between the end plates 4a, 4b at the positions inside the main frame to where the reinforcing ribs are secured, therefore, the distributed load W generated at the fore and aft sections of both of the water chambers 8a, 8b are received through the reinforcing pipes or rods 15a, 15b. Accordingly, the distributed load W is not transmitted to the trunk of the main frame substantially and, therefore, the deformation of the trunk 1 of the main frame will not be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condenser in which a titanium pipe is used as a cooling pipe, which is used, for example, in a thermal power plant, a nuclear power plant, etc. Concerning a condenser supplied with

Conventionally, as shown in FIG. 1, a condenser used in a power generation plant has a tube plate 3 that holds a large number of cooling f2 in a main body l.
m, 3b are incorporated, and an expansion joint 5 is disposed at least on one side between the tube sheets 3m, 3b and the main body end plates 4m, 4b, and the main body! IK is water chamber trunk 5 m 1
6b% water honey lid 7m.

Ice chambers 8 m and 81 s consisting of tube plates 3 m and 3 b are connected to each other via 7 lunges 9 m, 9 b, lea, and fob, respectively, and cooling water is provided at the lower end of the ice chamber 8 a on the inlet side. There is an input port of 11m, and an exit side water chamber of 8b.
A cooling water outlet 11b is provided at the lower end.

However, in a condenser configured as described above,
After the work is completed, the steam discharged from the steam turbine flows into the main body $l, while the cooling water enters the water chamber 8a from the cooling water inlet 11m, passes through the cooling pipe 2, and enters the water chamber 8b. The cooling water is then returned to the water source from the cooling water outlet 11b. This steam passes through the cooling pipe 2, loses its latent heat to the cooling water, and condenses into a liquid phase. This maintains the vacuum inside the main body shell 1. 1+ Since a large amount of the above cooling water is required, conventionally seawater has been mainly used, and the cooling water is installed at a level higher than the S surface and sent to the condenser using a pump and using a siphon effect. Supplied. Therefore, the design pressure of the condenser ice chambers 8m and 8b, which are installed at the highest level of the cooling water line, was relatively small. However, in recent years, especially in nuclear power plants, foundations have been required to have sufficient strength from the perspective of seismic design. In order to prevent thermal wastewater pollution in cases where seawater is used as cooling water, the cooling water system is constructed into a closed loop using a cooling tower, and the condenser is installed at a level below the water surface of the cooling tower. The number of cases where this happens is increasing.

In the above two cases, the siphon effect cannot be expected, the cooling water head is not high, and the water chamber 8 is inevitably
The internal pressure is also higher than that of the conventional one. ? : Water chamber of condenser such as 8. The state of the load a acting on the tube plate 3 and the cooling pipes 2 is as shown in Fig. 2, and the main body shell 1 and the cooling pipes 2 may come into contact due to differences in thermal expansion coefficients or due to changes in temperature or during operation. Although a difference in elongation occurs due to a temperature difference between the fluids, the expansion joint 5 eliminates the occurrence of thermal stress. On the other hand, the pressure P acting on the ice chamber acts on the entire surface of the ice chamber 117, and the load W is p=<kgt/d/if, width 4 m
When calculated assuming that the height is 5.5111, it becomes a huge value of 880TON. This W is the flange part 9. A distributed load W acts on the bolted portion of lO. Because of the presence of the expansion joint 5, this distributed load W is hardly transmitted to the main body shell 1, but is transmitted to the cooling pipe 2 via the tube plate 3. However, since the thickness of the tube plate 3 is very thin compared to its width, local deformation occurs around the tube plate, and a large tensile force is generated in the cooling tube 2 in this area. If this tensile force is greater than the adhesion force between the tube plate 3 and the end of the cooling tube 2, there will be adverse effects such as the tube expansion section coming off or cracking occurring at the welded section.

In order to solve this problem, the tube sheet 3 should be thickened to increase its rigidity so that the local deformation around the tube sheet 3 would be reduced, or some other method would be used to improve the rigidity of the tube sheet 3. The structure may be such that the distributed load W is not transmitted to the cooling pipe 2, but the former method has a limit in implementation from the viewpoint of resource saving. Therefore, various methods of the latter have been proposed in the past.

Figure 3 shows a typical example of this method.
By restraining the extension of the expansion joint 5 by the guide 12 fixed to the water chamber side 6 and the stopper 13 fixed to the water chamber side 6,
While the distributed load W is transmitted to the main body shell 1, the contraction of the expansion joint 5 is not restricted, and the expansion difference due to the temperature difference between the main body shell 1 and the cooling pipe 2 is absorbed. However, when the distributed load W is very large, transmitting the distributed load W to the main body shell 1 as in this method is dangerous and undesirable in terms of strength since the main body shell 1 is made of a thin steel plate.

Next, consider the difference in elongation between the main body shell 1 and the cooling pipe 2. If carbon steel is used for the main body shell 1, titanium is used for the cooling pipe, and the length of the cooling pipe 2 is 15 m, then the possible temperature conditions The maximum elongation difference 11'f at is 4.pl, and the tensile force generated in the cooling pipe 2 is approximately 150.9. This value is not a problem compared to the cooling pipe 20 deceptive tensile force.
When an internal pressure P is applied to the water m8 and a distributed load W acts, the body end plate 4 deforms as shown in FIG. 4. In this case, when P becomes 4kII/jFli degrees or more, the flange movement amount no.P due to the distributed load W generally increases by 14 to 9 times the elongation difference due to the temperature difference, and even if the conventional structure absorbs Δlrt, It becomes ineffective.

The present invention has been made in view of the above points, and an object of the present invention is to provide a condensate S that can reliably reduce the tensile force acting on a cooling pipe compared to a conventional structure with a simple structure. ! :With the goal.

An embodiment of the present invention will be described below with reference to FIG. Components that are the same as those in FIG. 1 are designated by the same reference numerals and their explanations will be omitted.

In Figure 5, the water chamber side 6m, 6b and the main body end plate 4m,
4b is a plurality of 5-shaped reinforcing lips 14a.

14b, 14a, and 14d, and the main body body end plate 4
m.

The reinforcing ribs 14m, 14, 14*, 14d of 4b are connected inside the main body 1 between both end plates by reinforcing pipes 15m, 15b.

Therefore, reinforcement lips 14m, 14b, 14a
, 14d, expansion and contraction of the expansion joint 5 is almost restricted. Even in this case, in the case of a condenser in which titanium tubes are used for the cooling tubes 2, the difference in thermal expansion coefficient with the main body 1 is smaller than in cases where aluminum brass or the like is used for the cooling tubes 2. Differences in elongation due to differences in thermal expansion are not a problem. Looking at it this way, it seems that the expansion joint 5 is unnecessary, but during construction, the expansion joint 5 was installed at a distance of 11
1! ! For practical purposes, it cannot be omitted.

In the condenser having the above configuration, the distributed load W generated by the water pressure P in the water chamber is hardly transmitted to the cooling pipes 2, and the reinforcing lips 14m, 14b, 14.

The reinforcing lip fixing parts of the main body body end plates 4m and 4b are 4m long on both end plates inside the main body.

The reinforcing lip fixing portion 4b is attached to both end plates 4 inside the main body.
The reinforcing pipe between m and 4b is a 15 m rod.

15 b Since it is connected from K, the front and rear ice cube compartments F
The distributed load W generated at j* and 8k causes the reinforcing pipe te to be stretched through the rods 15m and 15b. Therefore, the distributed load W is almost 141Kfl on the main body,
The deformation of the main body shell 1 as shown in FIG. 4 does not occur.

Furthermore, condensers in nuclear power plants, etc. are required to have a high degree of earthquake resistance, but in the structures shown in Figures 1 and 3, the water 1iE8b is not completely fixed, so it is cooled to the center of gravity of the ice chamber. When the seismic force Wm in the direction perpendicular to the pipe is applied, the entire ice chamber is deformed using the expansion joint as a fulcrum as shown in FIG. 6, and as a result, an excessive additional load is applied to the cooling pipe 2. Therefore, special seismic support is required to prevent the above deformation. However, in the structure of FIG. 5, which is the present example,
Since the reinforcing lips 14m, 14b, 14@, and 14d are completely fixed to the main body shell, deformation as shown in FIG. 6 does not occur, and no special seismic support is required.

As explained above, according to the present invention, the water N is fixed to the main body I with the reinforcing lip, and the reinforcing pipe is connected between both end plates on the inside of the main body at the part where the reinforcing lip is fixed on the nine end plates for the main body. te
Since they are connected by rods, etc., the load generated by the internal pressure of the ice cube chamber is absorbed by the reinforcing lip and the reinforcing pipe 17t through the rod, which prevents excessive deformation of the cooling pipe and the end plate of the main body. It also has the effect of providing high-level seismic resistance against seismic force in the direction perpendicular to the axis of the cooling pipe.

[Brief explanation of the drawing]

Figure 1 is a longitudinal side view of a conventional general condenser, and Figure 2 is an explanatory diagram showing the loads acting on each part of a conventional condenser, the deformation state of the tube sheet, and the load distribution acting on the cooling pipes. , FIG. 3 is a diagram showing a typical example of a conventional cooling pipe protection method, FIG. 4 is a diagram showing deformed states of each part of the condenser in the structure of FIG. 3,
FIG. 85 is a longitudinal sectional side view of a condenser according to an embodiment of the present invention;
FIG. 6 is a diagram showing the state of deformation of each part of the condenser during an earthquake in the structure of the llfS diagram. DESCRIPTION OF SYMBOLS 1... Main body trunk, 2... Cooling pipe, 3m, 3b... Tube plate, 4m, 4b... Main body trunk end plate, 5... Expansion joint,
6a. 6 b... Water IiI drama, 7m, 7b = Water chamber lid, 8
m, 8b... Himuro, 14m, 14b, 14@, 14
d=Reinforcement lip, 15m, 15b...Reinforcement pipe or rod. Applicant's agent Kiyoshi Inomata

Claims (1)

[Claims] The body shell is equipped with an expansion joint on at least one of both ends of the body shell, and an ice chamber consisting of a tube plate for holding a cooling pipe, a water chamber shell, and a water bottle cover is installed in succession on both ends of the main body shell. In a water container, each ice chamber and main body end plate are fixed via a reinforcing lip, and both end plates are connected with a reinforcing pipe or rond on the inside of the main body body at the main body body end plate reinforcing lip fixing part. A condenser characterized by: