JPH0229422Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a high temperature heat exchanger.

[Conventional technology]

In recent years, heat generated in high-temperature heating furnaces (for example, nuclear reactors) is extracted using a heat medium such as sodium, and this is exchanged with a secondary heat medium in an intermediate heat exchanger, and the heat obtained here is used to generate electricity, etc. is being implemented.

An example of the structure of a heat exchanger used in this high-temperature heating furnace will be explained with reference to FIG. A primary heating medium inlet 2 is formed for introducing a high temperature primary heating medium obtained from a heat exchanger (not shown) into the container 1. The high-temperature primary heat medium introduced into the container 1 from the primary heat medium introduction port 5 rises between the helical coils 3 in the container 1 in which a large number of helical coils 3, which are heat transfer tubes, are provided. The primary heating medium that has reached the top moves down the flow path 5 formed between the inner surface of the container 1 and the outer surface of the partition wall 4, and finally reaches the primary heating medium formed on the lower side of the container 1. It is discharged from the discharge port 6 and transferred to the high temperature heating furnace again.

On the other hand, the helical coil 3 is formed in a spiral shape around a main pipe 7 provided along the axial direction of the central part of the container 1, and one end thereof is connected to a secondary heating medium formed at the uppermost end of the container 1. It is connected to the inlet 8 via an upper connecting pipe 9 and an inlet header 10, and the other end is connected to the lower end of the main pipe 7 by an outlet header 11, so that the secondary heat medium inlet The low-temperature secondary heat medium introduced from the upper connecting pipe 9
After flowing down inside the helical coil 3, it exchanges heat with the primary heat medium, then flows into the lower end of the main pipe 7, rises inside it, and is sent to other devices from the secondary heat medium outlet 12 at the upper end. It is about to be transferred. In the figure, reference numeral 13 indicates a heat insulating material provided around the outer periphery of the container 1, reference numeral 14 indicates a heat insulating material provided on the inner surface of the partition wall 4, and reference numeral 15 indicates a tube support member.

In the above configuration, conventionally, in order to improve the heat exchange performance of the helical coil 3, a cylindrical and flat heat transfer accelerator plate as shown in FIGS. It has been implemented to provide a.

However, due to causes such as the primary heat medium flowing around the outer circumference of the helical coil 3 flowing locally along the inclined helical coil 3 as shown by arrow b, the heat exchange efficiency of the primary heat medium may be reduced. In addition, there was a problem in that the heat transfer accelerator plate a and the helical coil 3 had to be manufactured and assembled with high precision so that they would not come into contact with each other during the assembly stage of the heat exchanger.

[Problem that the invention attempts to solve]

The present invention aims to improve heat exchange efficiency by increasing the flow velocity of the primary heating medium and improving heat transfer performance, and at the same time, to facilitate assembly.

[Means for solving problems]

In the present invention, a heat transfer promoting plate having fins extending in the axial direction of the heat exchanger is provided between the inner and outer layers of a helical coil provided in the heat exchanger.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

Figures 4 to 6 show an example of the present invention.
As shown in FIG. 1, the helical coil 3 has a cylindrical shape inside the partition wall 4 and is provided in multiple layers on the inside and outside. with fin 1
6 is provided.

In the above, the fins 16 provided on the inner and outer surfaces of the heat transfer promoting plate 17 are formed so as to be shifted by half a pitch from each other, as shown in FIG.

As described above, since the heat transfer accelerator plate 17 having the fins 16 along the vertical direction is provided between the inner and outer layers of the helical coil 3, the heat transfer performance of the heat transfer accelerator plate 17 is improved by the fin effect. is improved, and thus the heat exchange efficiency can be improved.

In addition, a flow path is formed between the fins 18, which makes it easier for the primary heat medium to rise. As the flow velocity increases, the upward flow crosses the helical coil 3, so that the heat transfer performance is further improved.

Further, by providing the fins 16, the strength of the heat transfer accelerator plate 17, which is easily deformed under the influence of heat, is improved, and the heat transfer accelerator plate 17 can also be used as a spacer for the helical coil 3. That is, since the heat transfer accelerator plate 17 includes the fins 16, even if it is placed in contact with the helical coil 3, the primary heat medium can flow between the fins 18, so that the above-described effect can be achieved. This can be done without making any changes, and by acting as a spacer, manufacturing and assembly operations can be significantly facilitated.

It should be noted that the present invention is not limited to the above embodiments, and the shape of the fins can be changed in various ways.
Of course, various other changes may be made without departing from the gist of the present invention.

[Effect of idea]

As mentioned above, according to the heat exchanger of the present invention,
By providing fins on the heat transfer accelerator plate, it is possible to improve heat transfer performance due to the fin effect, and it is also possible to increase the flow velocity by reducing the cross-sectional area of the flow path, thereby improving heat exchange efficiency. Furthermore, by providing the fins in a direction intersecting the helical coil, excellent effects can be achieved such as the heat transfer promoting plate can also be used as a spacer to facilitate manufacturing and assembly.

[Brief explanation of drawings]

Figure 1 is a vertical sectional view showing an example of a heat exchanger;
The figure is a partial explanatory diagram showing an example of a conventional heat transfer accelerator plate.
FIG. 3 is a view in the direction of the arrows in FIG. 2, FIG. 4 is a partial explanatory diagram of the heat transfer accelerator plate in the heat exchanger of the present invention, FIG. 5 is a view in the direction of the arrows in FIG. 4, and FIG. 4th and 5th
FIG. 3 is a perspective view showing the shape of the heat transfer accelerator plate shown in the figure. 1 is a container, 3 is a helical coil, 4 is a partition wall,
16 is a fin, and 17 is a heat transfer accelerator plate.

Claims (1)

[Scope of utility model registration request] A heat exchanger characterized in that a heat transfer promoting plate having fins extending in the axial direction of the heat exchanger is provided between the inner and outer layers of a helical coil provided in the heat exchanger.