JPS5842063Y2 - Device that supplies liquid into a container - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for supplying liquid into a container, and in particular has a rectifying mechanism suitable for use in an overflow nozzle of an overflow tank for a liquid metal cooled fast breeder reactor (hereinafter referred to as FBR). Regarding nozzles.

A liquid inlet nozzle vertically attached to a container has a conventional structure without a particular mechanism for rectifying the flow, as shown in FIG. 1, an example of which is shown in FIG.

When such a liquid inflow nozzle is used in a system as illustrated in FIG. 2, there is a problem in that the liquid in the nozzle is biased.

Figure 2 is an example of an overflow system in FBR,
Liquid sodium is sent from the overflow tank 2 to the furnace vessel via a pumping nozzle 5, a pump 6, and a pumping pipe 7.

The liquid sodium in the furnace vessel 4 naturally flows down into the overflow tank 2 via the return pipe 8 and the liquid inlet nozzle 1, thereby maintaining a constant liquid level.

In such a system, when operating with a low flow rate of liquid sodium gravity flowing down into the overflow tank 2, or when gravity flow restarts due to reactor recovery after the gravity flow of liquid sodium is interrupted once due to reactor scram. In a low flow state, since there is a horizontal pipe 3 that is a part of the return pipe 8, the liquid sodium flowing down inside the liquid inflow nozzle 1 located on the downstream side of the horizontal pipe 3 flows through the liquid inflow nozzle as shown in FIG. This results in a drifting flow that partially wets the inner surface of 1.

Since the temperature of the fluid inflow nozzle 1 is not equal to the temperature of the inflowing liquid sodium, the fluid inflow nozzle 1
However, there was a drawback that non-uniform temperature distribution occurred in the circumferential direction, causing thermal stress.

In particular, when the natural flow of sodium is interrupted as described above, the mounting of the fluid inflow nozzle 1 and the overflow tank 2 is subject to thermal stress due to the temperature distribution occurring in the radial direction of the liquid inflow nozzle 1. It has occurred.

If the natural flow of sodium is restored under these conditions,
The above-mentioned circumferential thermal stress is applied to the mounting of the liquid inflow nozzle 1 and the overflow tank 2.

Therefore, during the transient state when the natural flow of natium is restored, the above-mentioned mounting will cause thermal stresses in the radial and circumferential directions in the part, and this mounting has the risk of breaking the part.

An object of the present invention is to suppress the generation of thermal stress during transient conditions in the connection between a liquid supply pipe and a container.

The feature of this invention is that the pipe and the container are attached by providing a restriction in the pipe at the vertical part of the pipe above the part. The reason is that a means is provided for distributing the liquid so that it flows over the entire area.

A preferred embodiment of the present invention applied to an FBR overflow tank will be described with reference to FIGS. 3 and 4.

The liquid inflow nozzle 1 is attached to the overflow tank 2 via a fluid head 14 in order to relieve thermal stress caused by elongation of the liquid inflow nozzle 1 due to a change in the temperature of the sodium flowing inside.

The fluid head 14 is a part of the wall of the overflow tank 2.

The tip of the liquid inflow nozzle 1 is inserted into an overflow tank 2.

A perforated plate 11 having an opening in the center serves as a liquid inflow nozzle 1.
The fluid head 14 is mounted horizontally in the return pipe 8 above the section 15 and at a vertical part of the return pipe 8 (existing upstream of the liquid inlet nozzle 1).

An upwardly convex conical guide plate 12 is provided above the mounting portion 15 and on the downstream side of the perforated plate 11.

The width of the annular gap formed between the outer circumference of the lower end of the conical guide plate 12 and the inner surface of the return pipe 8 is constant.

The conical guide plate 12 is attached to the perforated plate 11 by legs 13.

FIG. 4 is an explanatory diagram showing the structure of the perforated plate 11 and the guide plate 12.

Since the present embodiment is constructed as described above, the liquid sodium flowing down the vertical part of the return pipe 8 due to a biased flow due to the low flow rate is guided to the central hole of the perforated plate 11, and the liquid sodium flows down from this hole. The liquid is guided radially along the surface of the guide plate 12, and can flow down into the overflow tank 2 after uniformly wetting the entire inner surface of the liquid inlet nozzle 1.

Therefore, it is possible to prevent non-uniform temperature distribution in the circumferential direction from occurring in the liquid inflow nozzle due to the inflowing liquid sodium.

Therefore, (n) I) Even if the flow of the ram is resumed after the flow is interrupted, the mounting allows the sodium to flow uniformly over the entire inner circumferential surface of the portion 15;
In transient conditions, the mounting can prevent thermal stresses from occurring in the circumferential direction of the portion 15.

Therefore, the attachment can significantly relieve the thermal stress on the part 15, reducing the risk of breakage.

According to the present invention, in a transient state when the flow of liquid increases again, the attachment of the tube to the container can significantly suppress the thermal stress generated in the part.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a liquid inflow nozzle according to the prior art, FIG. 2 is an explanatory diagram of an FBR overflow system using the liquid inflow nozzle, FIG. 3 is a longitudinal sectional view of a liquid inflow nozzle according to the present invention, and FIG. FIG. 3 is an explanatory diagram showing a rectifying mechanism of a liquid inflow nozzle according to the present invention. 1... Liquid inflow nozzle, 11... Perforated plate, 12... Guide plate.

Claims (1)

[Scope of utility model registration request] In a device for supplying liquid into a container having a pipe that is inserted into a container and attached vertically to the container and supplies the liquid into the container, the connection between the pipe and the container is at the upper part of the container. providing a restriction in the pipe at a vertical portion of the pipe;
An apparatus for supplying liquid into a container, characterized in that the mounting is provided with means for distributing the liquid so that it flows over the entire inner circumference of the tube within the tube above the stop and below the constriction.