JPS6145481B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vapor trap characterized by using a chevron-shaped mesh to improve the flow of sodium trapped in the mesh filling portion of the vapor trap.

In equipment that handles liquid sodium, a vapor trap is used to remove sodium mist and vapor contained in the cover gas. As shown in Fig. 1, the vapor trap has a sodium trapping section 1 filled with a metal mesh or the like inside, and is filled by colliding sodium mist or vapor with the filling material or by cooling the inflow gas 5 containing sodium. It condenses or solidifies sodium on the surface of the object and removes the sodium component from the incoming gas.

The metal mesh used as the filling is stockinette woven material rolled into a spiral shape, or plain woven material stacked one on top of the other.

The sodium trapped in the filling in the vapor trap must be allowed to flow down quickly in its liquid state, and the sodium solidified in the filling must be melted and allowed to flow down by a heating operation called regeneration. However, in conventional vapor traps, the sodium adhering to the mesh filling is blown up due to its surface tension, viscous force, or the flow of gas flowing in from below, and cannot easily flow down.

Particularly, in the case of a filling made of spiral knitted mesh, droplets are difficult to drip if placed at the lower end, and in a packing made of stacked plain woven meshes, the same tendency as described above occurs for each mesh.

Clogged mesh occurs due to the above reasons,
The pressure drop increases, resulting in a shorter vapor trap life and more frequent regeneration. Also, the effect of playback operations is halved.

In order to improve the flow characteristics, some attempts have been made to install the vapor trap at an angle and allow the sodium to flow down along the wall surface, but if the vapor trap becomes large, problems may arise in its placement and support.

The object of the present invention is to improve the flow-down performance of sodium trapped in the filling (mesh) of a vapor trap, and to provide a long-life vapor trap with good capture performance.

In order to improve the flow performance of sodium and the flow performance of the rising gas flow in the upper and lower multi-stage plain weave mesh that is the filling material, the vapor trap according to the present invention has the peaks and troughs so that the direction of the wires of the mesh is oriented vertically. A plain weave mesh formed in the same manner as above is used for the middle tier and the bottom tier. For example, in a mesh installed horizontally, as shown in FIG. 2, large droplets of sodium cannot flow down and stick to the mesh, and gas is also difficult to enter into the mesh. On the other hand, when using the plain weave mesh with peaks and valleys according to the present invention, sodium easily flows down in the direction of the valleys of the mesh, reducing the amount of sodium that remains attached to the peaks, making it easier for gas to pass through the peaks. This can prevent the mesh from becoming clogged.

In one embodiment of the present invention shown in FIG. 3, plain weave meshes 9 are disposed in multiple upper and lower stages in the middle of the vapor trap body 2, which is provided with a gas inlet nozzle 3 and a trapped gas outlet nozzle 4. Plain weave mesh 9
are each formed in a wave shape so that a plurality of peaks and valleys occur.

When arranging the plain weave mesh 9 of each tier in multiple tiers, as shown in Fig. 3, the peaks of the plain weave mesh in the upper tier overlap with the ridges in the lower tier, and the valleys in the upper tier overlap with the valleys in the lower tier. Create a rapport relationship.

According to such a configuration, the lower inlet nozzle 3
The inflowing gas 5 that enters the vapor trap body 2 and rises passes upward through a trapping section consisting of upper and lower multi-stage plain weave meshes 9. During the passage, the sodium liquid in the gas is collected by the plain weave meshes 9. A small amount of gas flows out from the outlet nozzle 4. The sodium liquid collected by the plain weave mesh 9 of each tier flows down and concentrates in the troughs, becomes large droplets, drops one after another into the troughs of each tier, and finally leaves below the trapping part. Due to this downstream concentration,
In the troughs, the amount of adhering sodium liquid is small, and a good flow path for rising gas is ensured, and no sodium liquid is blown up. In addition, since the flow is concentrated toward the valleys, large particles of the sodium liquid occur in all stages, and it also flows down through the valleys of each stage, creating a gas upward flow path (the peaks of each stage). This makes it easier for the liquid to be separated, which prevents the falling droplets from being blown up. Therefore, the flow performance at each stage is improved, and the phenomenon in which the flow performance is impaired by the rising gas force is less likely.

According to the present invention, the flow performance of sodium in the filling can be improved, and a vapor trap with long life and good sodium capture performance can be provided.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a vapor trap, FIG. 2 is an explanatory diagram of a sodium flowing down method, and FIG. 3 is a sectional view of a cold trap according to an embodiment of the present invention. 1... Sodium capture section, 2... Vapor trap body, 3... Inlet nozzle, 4... Outlet nozzle,
5... Inflow gas, 7... Sodium droplet, 9...
Plain weave mesh.

Claims (1)

[Scope of Claims] 1. In a vapor trap in which a trapping section is formed by stacking plain weave meshes in multiple stages above and below, each of the plain weave meshes in at least the middle and bottom rows in the trapping section is formed so that peaks and troughs occur. A vapor trap characterized by: 2. The vapor trap according to claim 1, characterized in that each of the plain weave meshes in all the tiers is formed so that peaks and troughs are formed.