JPH0618189A - Heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object of the present invention to provide a heat exchanger capable of preventing damage to a buffer plate. [Structure] Inner cylinder 2 is placed inside inner body 1'disposed in outer body 1.
And a large number of heat transfer tubes between the inner case 1 ′ and the inner cylinder 2.
3 is provided, an inflow port 6 for allowing high temperature gas to flow is formed at the end of the outer barrel 1, and a mirror portion 2 facing the inflow port 6 at the end of the inner cylinder 2.
In the heat exchanger in which c is formed, the mirror portion 2c is covered with the cylindrical liner 12 and the buffer plate 15 is provided at the lower end portion of the liner 12, so that the buffer plate 15 is located away from the inflow port 6. That is, the flow path of the hot gas is easily located in an enlarged position, thereby reducing the flow velocity of the hot gas colliding with the buffer plate 15 and preventing the buffer plate 15 from being damaged by the fluid vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermediate heat exchanger for a high temperature gas furnace, and in particular, protects a lower end portion of an inner cylinder near a gas inlet from a high speed high temperature gas to smooth the high temperature gas. To those that can be guided to the heat transfer tube side.

[0002]

2. Description of the Related Art As one type of nuclear reactor, there is a high temperature gas reactor which uses helium as a heat medium. As an example of a heat exchanger used in this high temperature gas furnace, the one shown in FIG. 2 is conventionally known. In the heat exchanger X shown in this figure, an inner cylinder 1'is erected in an outer cylinder 1 having a substantially cylindrical shape, and an inner cylinder 2 is erected in the inner cylinder 1 '. And the inner body 1 '
A large number of helical coil heat transfer tubes 3 that form a spiral between
Has a basic configuration. A heat insulating material 1a is provided on the inner surface of the inner body 1'supported by an inner body heat insulating material liner 1b from the inside, and an annular gap 1c is provided between the inner body 1'and the outer body 1. Are formed.

The lower end of the inner cylinder 2 is closed to form a mirror portion 2c, and the upper end of the inner cylinder 2 is open at the upper end of the outer case 1, and this open portion serves as a gas outlet. Further, upper connecting pipes 4 ... Are connected to the upper portions of the helical coil heat transfer pipes 3 ...
The low-temperature helium gas flows into the heat transfer tube 3 from the. On the other hand, lower connecting pipes 5 ... Are connected to the lower portions of the heat transfer pipes 3 ..., respectively, and the secondary helium gas heat-exchanged through the heat transfer pipes 3 ... It goes up in 2 and flows out from the above-mentioned gas outlet.

An inflow port 6 is formed at the lower end of the inner case 1'protruding slightly from the lower end of the outer case 1, and high temperature helium gas is supplied from the inflow port 6 to the inner case heat insulating material liner 1.
While flowing between b and the inner cylinder 2 and passing between the heat transfer tubes 3, ..., Heat exchange is performed with the helium gas in the heat transfer tubes 3 ,. Out of the outlet 7
Further, the pressure is increased by a circulator (not shown), flows in from an inflow port 7'formed in the upper part of the outer case 1, and passes through the annular gap 1c to connect the lower end of the outer case 1 and the lower end of the inner case 1 '. It flows out from an annular outlet 77 formed between them and is returned to a furnace (not shown). Further, the inflow port 6
A buffer plate 8 is provided between the inner cylinder 2 and the inner cylinder 2. The buffer plate 8 prevents the high temperature helium gas flowing from the inflow port 6 from colliding with the lower end portion of the inner cylinder 2 and distributes and guides the high temperature helium gas to the heat transfer tubes 3 side. , And is supported by a plurality of leg portions 8a provided on the inner wall of the inner cylinder 2 near the inlet 6.

[0005]

By the way, in the heat exchanger having the above-mentioned structure, the buffer plate 8 is fastened to the high speed (3
Since the high temperature helium gas collides at 0-50 m / s),
A pressure difference is generated between the lower side and the upper side of the buffer plate 8, which may cause fluid vibration in the buffer plate 8 and damage the buffer plate 8. The vibration increases as the buffer plate 8 is provided at a location where the flow velocity of the high-temperature helium gas is high, that is, closer to the inflow port 6. Therefore, in order to reduce the vibration, the buffer plate 8 should be provided away from the inflow port 6. Good, but in this case, since the leg portion 8a that supports the buffer plate 8 must be lengthened,
There is a problem in that the support rigidity of the buffer plate 8 is reduced and the buffer plate 8 is damaged. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat exchanger capable of preventing damage to a buffer plate.

[0006]

In order to achieve the above object, the heat exchanger according to the present invention is provided with a liner around the mirror portion at the lower end of the inner cylinder, which covers them through a heat insulating material. Between the inlet and the liner, a buffer plate, which is spaced apart from the inlet and disperses high-temperature gas, is provided integrally with the liner.

[0007]

In the heat exchanger of the present invention, the buffer plate is provided at the lower end of the liner that covers the mirror portion of the lower end of the inner cylinder so that the buffer plate is located away from the inlet, that is, the flow of the hot gas. The passage is easily located at an enlarged position, thereby reducing the flow velocity of the hot gas that impinges on the buffer plate and preventing the buffer plate from being damaged by fluid vibration.

[0008]

FIG. 1 shows an embodiment of the heat exchanger of the present invention. In this figure, the same components as those of the conventional heat exchanger shown in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. The heat exchanger shown in FIG. 1 differs from the heat exchanger shown in FIG. 2 in the mounting structure of the buffer plate 15. The reduced diameter portion of the lower end portion of the inner cylinder 2, that is, the lower end portion is the mirror portion 2.
A cylindrical liner 10 having substantially the same diameter as the central portion 2b of the inner cylinder 2 is provided on the outer side of the high temperature header 2a which is closed as c. The liner 10 is provided on the upper half side of the high temperature header 2a, and a heat insulating material 11 is provided between the liner 10 and the high temperature header 2a.

At the lower end of the liner 10 is provided a liner 12 extending from the lower end to the mirror portion 2c at the lower end of the high temperature header 2a. The liner 12 has a cylindrical shape with a diameter smaller than that of the liner 10, and a heat insulating material 13 is provided between the liner 12 and the high temperature header 2a and the mirror portion 2c. Also, the above liner 1
The lower end of 2 is positioned slightly below the lower end of the mirror portion 2c, and a buffer plate 15 is fixed to the lower end of this liner 12. The buffer plate 15 has a spherical surface convex downward and is provided so as to face the inflow port 6. The lower connecting pipes 5 ... Are provided with the liner 12 and the heat insulating material 1.
3 through which the high temperature header 2a is communicated.

In the heat exchanger having the above structure, the high-temperature helium gas flows in at a high speed from the inflow port 6, and the buffer plate 1
When colliding with 5, the colliding helium gas is uniformly distributed to the outside because the buffer plate 15 has a spherical shape, and is smoothly guided to the heat transfer tubes 3 side. In addition, the buffer plate 15
Is provided at the lower end of the liner 12 that covers the periphery of the mirror portion 2c and the high-temperature header 2a, so that the buffer plate 15 is easily located at a position away from the inflow port 6, that is, at a position where the flow path of the helium gas is expanded. be able to. Therefore, since the flow velocity of the helium gas that collides with the buffer plate 15 becomes smaller than that in the conventional case, the pressure difference between the lower side and the upper side of the buffer plate 15 becomes smaller, so that the vibration due to this pressure difference can be suppressed. It is possible to prevent the buffer plate 15 from being damaged by this vibration.

Further, since the leg portion 8a as in the conventional case is not required to provide the buffer plate 15, even if the buffer plate 15 is provided away from the inflow port 6, the support rigidity of the buffer plate 15 is lowered. In this respect as well, the buffer plate 15
Can be prevented from being damaged. In addition, since the heat insulating material 13 is provided between the buffer plate 15 and the mirror portion 2c, the heat insulating material 13 functions as a so-called cushioning material, and the shock to the buffer plate 15 due to the collision of helium gas is mitigated. be able to.

[0012]

As described above, according to the heat exchanger of the present invention, since the buffer plate is provided at the lower end of the liner that covers the mirror portion of the lower end of the inner cylinder, the buffer plate is kept away from the inflow port. It can be easily located at a position, that is, a place where the hot gas flow path is enlarged. Therefore, since the flow velocity of the high-temperature gas that collides with the buffer plate becomes smaller than that in the conventional case, the pressure difference between the lower side and the upper side of the buffer plate becomes smaller, and thus the vibration due to this pressure difference can be suppressed. It is possible to prevent the buffer plate from being damaged by vibration.

Further, since the buffer plate is provided at the lower end portion of the liner covering the mirror portion, even if the buffer plate is provided away from the inlet, the support rigidity of the buffer plate does not decrease, and in this respect as well It is possible to prevent damage to the plate. Furthermore, since a heat insulating material is provided between the liner and the mirror portion,
This heat insulating material functions as a so-called cushioning material, and can reduce the impact on the buffer plate due to the collision of the high temperature gas.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing an embodiment of a heat exchanger of the present invention.

FIG. 2 is a longitudinal sectional view showing an example of a conventional heat exchanger.

[Explanation of symbols]

 1 Outer Body 1'Inner Body 2 Inner Cylinder 2c Mirror 3 Heat Transfer Tube 6 Inlet 12 Liner 13 Heat Insulation Material 15 Buffer Plate

Claims (1)

[Claims] 1. An inner cylinder is provided inside an inner case provided in the outer case, and a large number of heat transfer tubes are provided between the inner case and the inner case. In a heat exchanger having an inflow port through which high-temperature gas flows in and a mirror section facing the inflow port formed at the end of the inner cylinder, a liner covering the mirror section with a heat insulating material is provided around the mirror section. A heat exchanger, characterized in that a buffer plate, which is provided between the inlet and the liner of the inner case and disperses the high temperature gas at a distance from the inlet, is provided integrally with the liner.