JPS6162797A - Water chamber structure in heat exchanger - Google Patents

Abstract

PURPOSE:To provide a water chamber structure having a high pressure-resistant characteristic by a method wherein a plurality of cylindrical water chamber holes are arranged in one block, a pipe assembly plate is arranged at one end of each of the water chamber holes and at the same time the other end is closed by the pipe plate. CONSTITUTION:Water chamber hole structure of a boiler water supplying and heating high pressure heater is formed by a water chamber block 11, a pipe assembly plate 12 and a lid plate 13. That is, the water chamber hole block 11 is provided with a plurality of cylindrical water chamber holes 14a and 14b in such a way as they are properly and uniformly spaced apart to each other to have a specified distribution of temperature in the water chamber structure. At one end of each of these water chamber holes 14a and 14b, the pipe plate 12 to which a plurality of thermal conduction pipes 4 are welded to the water chamber block 11. The other end of each of these water chamber holes 14a and 14b is made such that the lid plates 13 closing the water chamber holes 14a and 14b are fastened with a plurality of bolts 15 to the water chamber block 11. A plurality of water chamber holes form the water supplying water chamber and in turn a plurality of water chamber holes form the water supplying outlet.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat exchanger, particularly to a water chamber structure of a high pressure heater for heating boiler feed water in a steam generation plant.

2. Description of the Related Art A conventional high-pressure heater for heating boiler feed water in a steam power generation plant is shown in FIG.

The extracted steam 5 from a turbine (not shown) passes through a number of U-shaped heat exchanger tubes 4 connected to the plate 3.
then enters the outlet water chamber 6 and
sent outside. On the other hand, the bleed steam 5 enters the heater body 7, heats the feed water 1 with the heat transfer tube 4, becomes drain, accumulates at the bottom of the heater body 7, and is then discharged from the heater body 7 without further heating the water supply 1. be done.

Note that the inlet water chamber 2 and the outlet water chamber 6 are separated by a partition plate 9.

Problems to be Solved by the Invention In the case of such a high-pressure feed water heater, the pressure of the boiler feed water 1 varies from 170 klil/cnl to 3301 V/ffl.
Since the pressure is extremely high, the thickness of the hemispherical wall 10 that constitutes the water chambers 2 and 6 and the thickness of the circular flat tube plate 3 have to be extremely thick in order to withstand this high pressure. It ends up. For example, the thickness of the wall 10 is 100 to 150 mm 1 tube plate 3
The thickness of the forging is 300 to 400 mm, so
The drawback is that it is difficult to manufacture by welding and drilling, and it is very expensive.

Therefore, the present invention improves the structure of the wall 10 and tube sheet 3 that constitute the water chambers 2 and 6, thereby making it possible to withstand the high pressure of the boiler feed water and making the tube sheet 3 thinner than before. The present invention aims to provide a chamber structure by providing a plurality of cylindrical water chamber holes in one block body, providing a header tube plate at one end of each of these water chamber holes, and providing a cover plate at the other end. It is sealed to create a water chamber structure with high pressure resistance.

EXAMPLE Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, the water chamber structure of the boiler feed water heating high pressure heater is formed by a water chamber block body 11, a header tube plate 12, and a cover plate 13.

That is, in the water chamber block 11, a plurality of cylindrical water chamber holes 14a, 14b are provided at approximately equal intervals from each other so that the temperature distribution of the water chamber structure is constant. And each of these water chamber holes 14a.

At one end of 14b, a tube plate 12 to which a plurality of heat exchanger tubes 4 are coupled is welded to the water chamber block body 11. Further, each of these water chamber holes 14a and 14b is fastened.

Thus, the plurality of water chamber holes 14a form a water supply artificial water chamber, while the plurality of water chamber holes 14b form a water supply outlet water chamber. First, the communication structure between the water supply inlet water chamber hole 14a and the water supply inlet nozzle 16 will be explained. A plurality of communication holes 17a are branched from the water supply inlet nozzle 16 to form some of the plurality of water supply inlet water chamber holes 14a. is in contact with. Further, the communication holes 17a communicate the water supply inlet water chamber holes 14a connected to the water supply inlet nozzle 16 through the communication holes 17a with other water supply inlet water chamber holes 14a. In this way, all the water supply inlet water chamber holes 14a are connected to the communication hole 17.
It is connected to the water supply inlet nozzle 16 through a. Similarly, all the plurality of water supply outlet water chamber holes 14
b is connected to the water supply outlet nozzle 18 through the communication hole 17b.

Note that the water supply inlet and outlet nozzles 16 and 18 also have water chamber holes 14a, 14b and communication holes 17a, 17b.
It goes without saying that it is provided in the water chamber block body 11 similarly.

Next, to explain its operation, the water supply 1 enters each inlet water chamber hole 14a from the water supply inlet nozzle 16 through a plurality of communication holes 17a, and then passes through the tube plate 12 and enters the heat exchanger tube 4.
Then, it enters the outlet water chamber hole 14b through the tube plate 12 on the outlet side, and is then collected in the water supply outlet nozzle 18 through the communication hole 17b, from where it flows out.

At this time, the thickness t of the tube plate 12 necessary to withstand the pressure P of the water supply applied inside each water chamber hole 14a, 14b can be expressed by the following equation in relation to the diameter of the tube plate 12. can.

t'' D If the area of the tube plate required to connect the heat tubes is taken as a person, it can be expressed as π 2 - π 2 A = 7DO - 7D x n. From this formula, D = -D
(2) Substituting 4-0 gives , which is the diameter. By dividing a single tubesheet into n small tubesheets of diameter, the thickness of the tubesheet can be made extremely thin.

Effects of the Invention According to the present invention, the water chamber structure of the heat exchanger is made up of a plurality of cylindrical water chamber holes provided in the water chamber block body, so the diameter of each water chamber hole can be made relatively small. can do.

Accordingly, the diameter of the tube plate provided at one end of each of these water chamber holes can also be reduced. therefore,
The thickness of the tube sheet can also be made thinner.

Furthermore, since the water chamber structure according to the present invention is composed of a water chamber block body provided with a plurality of water chamber holes, it is sturdy as a whole, and the temperature distribution is uniform, so excessive thermal stress is avoided. The semicircle that occurs is 2~.

Moreover, as in the embodiment, each water chamber hole 14a, 14
If the cover plate 13 that closes the hole b is tightened by the port 15 and made detachable, the cover plate can be easily opened, so that each water chamber hole can be inspected and repaired very easily.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an example of the water chamber structure of a heat exchanger according to the present invention, and FIG. FIG. 3 is a longitudinal sectional view showing the entire conventional heat exchanger. 4@・Heat transfer tube, 11@・Water chamber block body, 12・・Tube plate, 13・・Lid plate, 14a・・Water supply inlet water chamber hole, 14b・
・Water supply outlet water chamber hole, 15...Bolt, 16...Water supply inlet nozzle, 17a, 17b...Communication hole, 18...Water supply outlet nozzle. (2 others) Figure 1 ■α-1 Figure 2

Claims (1)

[Claims] Multiple cylindrical water chamber holes are provided in one block body,
The water chamber structure of the heat exchanger includes a header tube plate provided at one end of each of these water chamber holes, and a lid plate covering the other end.