JPH0341776Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to an adsorption device that filters contaminated air.
In particular, the present invention relates to a sample container for checking the deterioration state of an adsorbent filled in the main adsorption layer of an adsorption device.

(Prior art) In order to filter contaminated air in a nuclear power generation facility, an adsorption device 2 is installed inside a casing 1 as shown in Fig. 6, but the adsorption device 2 is filled with granular adsorbent A such as activated carbon. A main body adsorption layer 4 is provided, and a sample container 10 is attached as a means for checking the deterioration state of the adsorbent A (Japanese Patent Publication No. 55-
Publication No. 35974).

A plurality of sample containers 10 are removably attached to the shielding plate 6 of the contaminated air inflow path 3 via attachment pipes 7 communicating with the contaminated air so as to be parallel to the main body adsorption layer 4 and the inflow air flow. Ru. The sample container 10 is composed of three cylindrical members 10a,
Each cylindrical member 10a is attached to the mounting tube 7 via an O-ring, and the inside thereof is filled with the same adsorbent A as the adsorbent A filled in the main body adsorption layer 4 so as to have the same thickness.

Therefore, the cylindrical member 10a of the sample container 10
and the mounting pipe 7 and between each cylindrical member 10a.
To prevent contaminated air from leaking from the ring into the atmosphere without being filtered, the seventh
As shown in the figure, the sample container 10 is housed in a safety basket 12 having an inner diameter larger than the outer diameter of the sample container 10, and the sample container 10 is placed between the two.
A cylindrical member 10a that constitutes the sample container 10 is filled with the same adsorbent A as the adsorbent A filled inside.
Contaminated air leaking by-pass from between the two is auxiliary filtered by the adsorbent A in the safety basket 12' and then released into the atmosphere.

(Problems to be Solved by the Invention) However, in the auxiliary filtration device using the safety basket 12', the safety basket 12' is required to hold an adsorption layer that filters contaminated air to the same degree as the main adsorption layer 4. It is quite large and is practically unreasonable. This is because contaminated air is introduced downward from the attachment tube 7, so the contaminated air leaking from the O-ring between the uppermost cylindrical member 10a and the attachment tube 7, which joins the attachment tube 7, is In order to achieve sufficient filtration, it is necessary to secure an adsorption layer above this position with the same thickness as the main body adsorption layer 4. Therefore, the adsorption layer below the leakage position and the adsorption layer above this position must be secured above the leakage position. The basket adsorption layer is required to be more than twice as large as the main body adsorption layer 4 (see Figure 5).
sample container). Also, the O of the blind flange for sealing after sample container 10 is removed.
No measures can be taken against bypass leakage from the ring (not shown).

(Means for Solving the Problems) Therefore, in the present invention, as a means for solving the above-mentioned problems, the tip of the mounting pipe 7 that communicates with contaminated air is arranged facing upward, and the end of the mounting pipe 7 is A perforated plate 27 is interposed between the sample container 10 and the safety basket 12 so that the bottom part 14 of the bottomed cylindrical safety basket 12 for storing the sample container 10 is inserted into the mounting tube 7 and fixed airtightly. In the space of
A basket adsorption layer 24 having an adsorption layer thicker than the adsorption layer thickness of the sample container 10 is formed.

(Function) The present invention achieves the following effects by the above means. According to the present invention, even if the sample container 10
Even if a bypass leak occurs from the seals between the cylindrical members 10a, the safety basket 12
Due to the basket adsorption layer 24 filled with the additional adsorbent A, the total path of passing through the adsorption layer inside the sample container and the path through the adsorption layer inside the safety basket is always equal to or greater than the path through the main body adsorption layer 4. , where contaminated air is not released into the atmosphere unfiltered.

(Embodiment) An adsorption device as a preferred embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 5. 1 is a sequence for forming an air flow path for discharging contaminated air containing radioactive materials in a nuclear power generation facility, and 2 is an adsorption device installed inside the casing 1 to filter contaminated air. The adsorption device 2 includes a plurality of contaminated air inflow channels 3 that open in an upstream shielding plate 5 perpendicular to the inflow air of the casing 1 and allow contaminated air to flow in, and a filter made of activated carbon or the like that filters the contaminated air to make clean air. A plurality of main body adsorption layers 4 filled with granular adsorbent A and formed parallel to the incoming air flow...
... are arranged adjacent to each other in an appropriate number alternately, and the incoming contaminated air is passed through the main body adsorption layer 4, filtered by the adsorbent A filled in the main body adsorption layer 4, and the filtered clean air is shielded. It is discharged into the casing 1 through the opening of the plate 6. When the adsorption capacity of the adsorbent A deteriorates, the deteriorated adsorbent A is discharged from the main body adsorption layer 4, and the main body adsorption layer 4 is refilled with new adsorbent A.

Deterioration of the adsorption capacity of the adsorption device 2 is determined as follows. That is, a plurality of mounting pipes 7, each curved at 90 degrees, are opened at the shielding plate 6 of a plurality of contaminated air inflow paths 3 provided in the casing 1, with the tips thereof protruding upward, and contaminated air and A sample container 10, . The container 10 is periodically taken out and tested.

Each sample container 10 is divided into a plurality of cylindrical members 10a (four in this example) so that the adsorption layer can have the same adsorption layer thickness as each type of main body adsorption layer having different thicknesses. Each cylindrical member 10a has a cylindrical shape with the top and bottom open, has a perforated plate 11 at the bottom, and has a main body adsorption layer 4.
The sample container 10 is filled with the same adsorbent A as that filled in the sample container 10, and the total layer thickness of the adsorbent A divided into four parts is equal to the layer thickness of the main body adsorption layer 4.

A bottomed cylindrical safety basket 12 having an inner diameter that can accommodate the sample container 10 is placed a little before the outlet 9 of the attachment tube 7.
The upper part 13 is opened, and the bottom part 14 is seal welded to fix the base airtightly.

Four cylindrical members 10 are placed in this safety basket 12.
In order to store the sample container 10 made of
They overlap each other in an airtight manner via the ring 17, and have the same inner and outer diameters as the cylindrical member 10a on the downstream side of the uppermost part,
A spacer 18 having a flange 19 on the outer periphery of the upper end and having a height that allows the space between the safety basket 12 and the sample container 10 to be filled with the adsorbent A for surplus.
is polymerized through the O-ring 20, and the connection pipe 15 is polymerized through the O-ring 20.
The flange 16 of the spacer 18 and the flange 19 of the spacer 18 are fixed together with four bolts 21, and this integral body is connected to the outlet 9 of the mounting pipe 7 via an O-ring 22.
The two are airtightly overlapped and fixed to the safety basket 12 with four bolts 23.

As shown in FIG. a space between the safety basket 12 and the sample container 10, and fill the space between the safety basket 12 and the sample container 10 with the same adsorbent A as the adsorbent A to be filled in the main body adsorption layer 4 and the sample container 10, A basket adsorption layer 24 having an adsorption layer thicker than the adsorption layer thickness of the main body adsorption layer 4 and the sample container 10 is formed.

As shown in FIG. 2, the adsorbent A is filled in a cylinder 25 with a bottom that fits loosely with the outer periphery of the safety basket 12 and has a chevron-shaped bottom and a plurality of small holes 26 at positions corresponding to the above-mentioned intervals. It is convenient to store it.

Further, as shown in FIG. 3, the safety basket 12 is close to the opening at the tip of the attachment tube 7, and a perforated plate 27 such as punched metal or wire mesh is interposed in the attachment tube 7 to prevent the adsorbent A from falling. After removing the sample container 10, additional adsorbent A is filled, and the opening is closed with the blind flange 28, so that even if there is a leak between the blind flange 28 and the safety basket 12, the inside of the safety basket 12 will be protected. The adsorbent A, which has the same thickness as the main body adsorption layer 4, is used to completely filter contaminated air.

When contaminated air is passed through the adsorption device 2 configured as described above, the contaminated air is filtered by the adsorbent A when passing through the main body adsorption layer 4 and is discharged as clean air. As the adsorption capacity deteriorates after being used for a long time, the deterioration can be determined by periodically removing the sample container 10 provided in parallel with the main adsorption layer 4 and the circulating air flow.
The same adsorbent A as the main body adsorption layer 4 filled therein is tested to determine when to replace the adsorbent A in the main body adsorption layer 4.

While this adsorption device 2 is in operation, the attachment pipe 7 and the connecting pipe 15, the connecting pipe 15 and the lowermost cylindrical member 10a, between each cylindrical member 10a, and the uppermost cylindrical member 10a
Even if a bypass leak occurs between any member between the main body adsorption layer 4 and the spacer 18, this leaked contaminated air will always pass through the adsorption layer in the sample container and the safety basket through the adsorption layer passage within the sample container that is longer than the minimum path of the main body adsorption layer 4. It passes through the route, is safely filtered, and is discharged into the atmosphere.

(Effect of the invention) As described above, in the adsorption device of the present invention, all the contaminated air due to the bypass leak generated in the sample container 10 is transferred to the main body adsorption layer by the basket adsorption layer 24 in the safety basket 12 housing the sample container 10. Since the structure is such that the air is discharged through adsorption layers having a minimum number of paths of 4 or more, contaminated air caused by bypass leaks is always completely filtered and becomes clean air before being discharged into the atmosphere. Since the bottom of the safety basket 12 is fixed, the basket adsorption layer 24 only needs to be provided in the upper part, so the size is about half that of the conventional device, and the device can be made smaller. (See Figure 5). Further, even after the sample container 10 is removed, by filling the safety basket 12 with the adsorbent A, substantially the same effect as described above can be achieved.

[Brief explanation of drawings]

Figure 1A is a partial cross-sectional view of the mounting structure of the sample container of an adsorption device according to the present invention; Fig. 3 is a vertical sectional view showing a part of the apparatus for filling the adsorbent with the device shown in Fig. 1 after removing the sample container, and Fig. 4 is a longitudinal sectional view showing a part of the apparatus shown in Fig. FIG. 5 is an explanatory view showing the effect of the present invention; FIG. 6 is a perspective view of a conventional device corresponding to FIG. 4; FIG. 1 is a longitudinal cross-sectional view of a conventional device corresponding to FIG. 1. FIG. DESCRIPTION OF SYMBOLS 1... Casing, 2... Adsorption device, 3... Contaminated air inflow path, 4... Main body adsorption layer, 6... Shielding plate, 7... Mounting pipe, 10... Sample container, 10
a... Cylindrical member, 12... Safety basket, 14
...bottom, 24...basket adsorption layer.

Claims (1)

[Scope of utility model registration request] In a casing 1 through which contaminated air flows, a plurality of main body adsorption layers 4 filled with adsorbent A and filtering contaminated air passing therethrough, and a plurality of contaminated air inflow passages 3 are disposed adjacent to each other, and the contaminated air is A plurality of sample containers 10 assembled in multiple stages were removably attached to a plurality of cylindrical members 10a via O-rings 13 to a plurality of attachment pipes 7 communicating with the contaminated air on the shielding plate 6 of the inflow path 3. In the adsorption device 2, the attachment pipe 7
The bottom part 1 of the bottomed cylindrical safety basket 12 for storing the sample container 10 is arranged with the tip facing upward, and a perforated plate 27 is interposed in the mounting tube 7.
4 is inserted into the mounting tube 7 and fixed airtightly to form a basket adsorption layer 24 having an adsorption layer thicker than the adsorption layer thickness of the sample container 10 in the space between the sample container 10 and the safety basket 12. An adsorption device characterized by: