JPH0219740A - Device for sampling molten glass - Google Patents

Abstract

PURPOSE:To easily discriminate which container sample a pot taken out is by installing a sampling device at every container. CONSTITUTION:A sampling device 4 is installed at every canister (container made of a metal) 3. In this state, a radioactive substance generated from reprocessing facilities, etc., and a glass raw material are supplied to a melting furnace 1 and melted. Subsequently, the device 4 is placed on the top part of the container 3, and carried to a position right under a canister coupling device 2. Airtightness of the inside of the melting furnace 1, the device 4 and the container 3 is maintained due to a fact that the upper face of this device 4 is brought into contact with the lower face of the device 2. Next, glass which has flowed out of the melting furnace 1 is injected into the container 3 through the device 2 and the frame 5, and by driving a driving part 7, moving a lever 6 and advancing a pot 9 to a flow point of glass, glass can be brought to sampling.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a sampling device for melt plus flowing down from a melting furnace into a container.

(Prior Art) Below, as a prior art, sampling of molten glass in a device that performs vitrification treatment of radioactive waste generated from a nuclear reactor reprocessing facility will be described, but the application of the present invention is limited to this. It is generally applicable to sampling of laths rather than melting.

Spent fuel from fast breeder reactors is reprocessed in reprocessing facilities to extract uranium and plutonium, producing high levels of radioactive waste.

The vitrification method is a technology to more safely transport, store, and dispose of this radioactive waste.

This vitrification method involves supplying radioactive waste and lath raw materials to a melting furnace, mixing the molten glass and radioactive waste, injecting it into a metal container (hereinafter referred to as a canister), and cooling it. It is made into a glass assimilate.

By the way, in this vitrification method, it is necessary to inspect the properties and composition of the molten glass, such as whether the radioactive substances contained in the glass can be stored for a long period of time. Therefore,
A portion of the molten glass injected into the canister from the melting furnace is sampled to investigate its composition.

As a conventionally known molten glass sampling method, @7
The sampling method shown in Figure 7 is based on the icicle (cone) shaped solidification that is formed on the top surface of the canister 3 when the injection of molten glass into the canister 3 is completed. This is done by folding glass 20, and is mainly done in Belgium.

However, with this method of folding the icicle-shaped solidified glass 20, the amount to be collected is non-uniform, and there is a fear that it may not always be possible to sample the amount necessary for testing the composition and the like.

As a sampling method that does not have such drawbacks, as shown in FIG. There is a vacuum cleaner 21 that sucks the glass through the vacuum cleaner 21. This method is mainly used in West Germany.

However, since this vacuum siphon method samples from inside the melting furnace 1, the composition of the glass in a particular canister does not necessarily match the composition of the glass sampled from the melting furnace 1. For this reason, it was not possible to confirm the composition of the glass in each canister 3. In addition, there is a suction pipe 2 in the positive
There was a risk that the suction pipe 22 could not be extracted from the melting furnace 1 due to the glass solidifying while the suction pipe 22 was inserted. Furthermore, since the suction pipe 22 is extremely high in tension, the amount of secondary waste is increased.

Therefore, as a sampling method that does not have the above drawbacks, there is a method in which a bot 9 is suspended from the top of the canister 3 inside the canister 3, and the glass is sampled by the suspended bot 9, as shown in FIG. . in this case,
Since the bot 9 is suspended from the start of pouring molten glass until the end of the pour, once the bot 9 is full, the bot 9 is suspended.
Molten glass overflows into the canister 3. After filling the canister 3 with molten glass, the bot 9 is pulled up. This method is mainly used in the United States.

However, even with this hanging bot method, the bot 9 cannot be taken out until the glass pouring operation is completed, so it is not possible to sample glass at any stage during pouring.

Note that with this method, after sampling, it is possible to stop the positive injection, take out the bot 9, and then re-inject the glass, but this poses the problem of complicating the operation of the melting furnace. Adopting such a work process is by no means easy.

Therefore, as a sampling method that does not have the drawbacks that occur in the above-mentioned methods, as shown in FIG. There is a method of sampling into the bot 9, then returning the orientation of the direction changing device 23 to continue pouring glass again, and this method is mainly practiced in Japan.

However, even with this method, if the direction changing device 23 fails and the glass cannot be returned to the injection port of the canister 3, there is a risk that the glass may flow out of the canister 3.

A sub-ring device that eliminates all of the drawbacks of the conventional system as described above is disclosed in Japanese Patent Laid-Open No. 151599/1983. In this device, as shown in Fig. Pt511 (a), the bot 9 is attached to the moving element pi24 so as to be freely attached, and the moving means 24 moves the bot 9 to a positive downstream point (Fig. (See (b)) While sampling, the bot 9 is returned to its normal position (Wt, the position shown in Figure 11 (,)) and taken out.

According to this device, it is possible to perform sampling reliably, and the capacity of the bot 9 makes it possible to sample a constant amount necessary for sampling, and the melting furnace 1
The glass can be sampled at any stage during injection without complicating the operation of the canister 3, the composition of the glass in each canister 3 can be confirmed, and secondary waste can be Only a small amount of bot 9 is required, and furthermore, even if the device breaks down, the plus is continuously injected into the canister 3, so there is no possibility that the plus will flow out of the canister 3.

(Problem to be Solved by the Invention) By the way, in the sampling device disclosed in the above-mentioned Japanese Patent Laid-Open No. 58-151599, a moving means 2 is provided below the melting furnace.
4 is fixedly installed, and the molten glass in each canister 3 is sampled by changing the bot placed on the arm of the casting device each time.

Therefore, there was a risk that it would be difficult to identify which canister the sample of the bot 9 was taken out.

Further, since the device including the moving means 24 is fixed and large in size, if a failure occurs in the sampling device, it is difficult to replace it by remote control using a manibulator or the like for maintenance.

Moreover, if the injection speed changes and molten glass overflows from the bot 9, there is a risk that it will be difficult to take out the bot 9 later.

The present invention has been made in view of the above-mentioned problems of the prior art.The purpose of the present invention is to easily identify which canister the sample of the removed bot is, to easily remove the bond, and to enable remote control in the event of a failure. The object of the present invention is to provide a melt-plus sampling device that can be easily replaced.

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows. That is, the present invention provides a coupling device connected to a container on the lower side of the melting furnace, allows molten glass to flow down from the melting furnace to the container, and samples the molten glass on the way down. It consists of a frame which is freely placed and whose upper part is in close contact with the coupling device, a moving means provided on the frame, and a sampling bot detachably attached to a lever provided on the moving means, 11q The frame is movable together with the container.

(Example) Examples of the present invention will be described below with reference to FIGS. 1 to 6.

Hereinafter, as an example, a molten glass sampling device for vitrifying radioactive waste generated from a C1 nuclear reactor fuel reprocessing facility will be described, but the application of the present invention is not limited to this. Applicable to glass sampling in general.

Referring to the overall view of FIG. The canister coupling device 2 connects the melting furnace 1 and the canister 3 in a sealed state, and has a bellows 2a provided at its lower end for absorbing displacement. In the present invention, a sampling device 4 is provided between the top of the canister 3 and the bellows 2a of the canister coupling device 2.
is to be installed.

As shown in FIGS. 1, 3, and 4, the sampling device 4 according to this embodiment has a frame 5 of a size and shape that can be placed on the top surface of the canister 3. Since the molten plastic passes through the center of the frame 5 and falls, the center of the frame 5 is a space. In this embodiment, the frame 5 of the sampling device 4 has a circular ring shape, but since the frame 5 is placed on the mouth of the top of the canister 3, if the shape of the mouth is square, The shape of the frame 5 is also square.

The frame 5 is provided with a moving means consisting of a lever 6 and a drive section 7. The lever 6 is provided by horizontally passing through the frame 5, and the driving part 7, such as a shilling, is located outside the frame 5 of the lever 6 and is fixed to the frame 5. The glass is slid horizontally toward the point where the glass flows down.

On the other hand, the center of the frame 5 of the lever 6 'l f'J] f
f1ll I; is provided with a tray 8, on which a sampling bot 9 is removably placed.

A lower annular welding surface 10 is formed on the top of the canister 3 in order to close and weld the lid after glass is poured into the canister.
On the other hand, a fitting part 11 is formed at the bottom of the frame 5 of the sampling device 4 to fit into and come into contact with the welding surface 10 of the canister 3. Therefore, when installing the frame 5 in the canister 3, the welding surface 10 and the fitting part 11 are used to position the frame 5, ensuring a stable installation state, and preventing the molten glass from adhering to the welding surface 10 of the canister 3 and closing it. This prevents any hindrance when closing the lid.

Note that the present invention does not limit the structure that comes into contact with the insertion part 11 of the frame 5 to the welding surface 10 of the canister 3, and other structures may be provided at the mouth of the canister 3.

Further, the lever 6 is provided with a stopper 12 for restricting the movement of the lever 6, if necessary.

Furthermore, in this embodiment, the entrance shape of the bottom 9 is formed as a cut cut at an angle from the top of the cylinder. According to this shape, if the glass overflows, the glass will flow out into the canister 3 from the inclined lower part 13 side.

However, the shape of the bot 9 is not limited to this, and may be formed into a box shape, for example.

Furthermore, the amount of glass required can be adjusted by changing the shape of the bot.

Further, the outer surface of the bot 9 of this embodiment extends downward, and the receiver serves as a skirt portion 14 that covers the tray 8. The receiver prevents glass from adhering to the tray 8 and prevents the removal of the bot 9. I'm trying to prevent it from happening.

The present embodiment configured as described above operates as follows.

As shown in FIG. 2, radioactive materials and glass raw materials generated from a reprocessing facility or the like are supplied to a melting furnace 1 and melted. Then, the sampling device 4 is placed on the top of the canister 3 using a remote fabrication device such as a manibulator (not shown), and with the sampling device 4 still installed, the canister 3 is transferred to the canister coupling device 2 by a canister conveying device (not shown). Transport to the position directly below.

The upper surface of the sampling device t comes into contact with the lower surface of the canister coupling device 2, thereby maintaining airtightness inside the melting furnace 1, sampling device 4, and canister 3, thereby preventing scattering of glass and diffusion of radioactive materials. .

Next, the operation of the present invention will be explained.

First, as shown in FIG. Then, the glass flowing out from the melting furnace passes through the canister coupling device 2 and the frame 5 to the canister 3.
injected into the.

As shown in FIG. 5 (b), the dog drives the drive unit 7 by pressing the button at any stage during injection, moves the lever 6, and automatically advances the bot 9 to the point where the glass flows down. sample the glass.

When the glass is poured into the bot 9 to the extent that it overflows, the drive unit 7 is operated again to automatically return the lever 6 to its original position, as shown in FIG. 5(c), and the sampling is completed.

After the canister 3 is filled with glass, the canister 3 is moved from the position directly below the canister coupling device 2 with the sampling device 4 still installed using a canister transport device (not shown), and the bot 9 is moved from the position of the lever 6 by a manipulator. It is taken out from the dish 8 and carried to a composition analyzer (not shown).

Next, the frame 5 is removed from the canister 3 by the manibulator, and after a new bot 9 is attached,
It will be used again for sampling work.

As described above, according to the present invention, the sampling device 4 is installed for each canister 3, so when a pot 9 is taken out and transported to an analysis device, it is not clear which canister 3 the pot 9 belongs to. There is no.

If a failure occurs in the sampling device 4, the entire sampling device 4 can be easily replaced using a manibulator.

Note that the operation of the lever is not limited to linear reciprocating motion as in this embodiment, but may be reciprocated in an arcuate manner, for example.

Further, when the glass injection speed changes, the operation time of the driving means may be set appropriately depending on the injection speed.

The container is not limited to one container made of M gold called a canister.

In the above embodiment, only one lever and pot are installed on the frame, but the present invention is not limited to the above embodiment, and includes a plurality of levers and pots as shown in Fig. 16. lJ
This includes a structure in which a plurality of bolts are provided and a plurality of bolts are provided. That is, referring to FIG. 6, a plurality of levers 6, drive portions 7, and saucers 8 are attached to the frame 5 in the radial direction. Therefore, the lath can be sampled at multiple points during the injection into one canister.

(Effects of the Invention) According to the present invention, since a sampling device is installed for each canister, when a pot is taken out and transferred to an analysis device, it is not clear which canister the pot belongs to. do not have.

Furthermore, if a failure occurs in the sampling device, the entire sampling device can be easily replaced using the manibulator.

Furthermore, even if the pot overflows with lath, the pot can be easily removed.

Furthermore, the sampling operation can be performed while maintaining airtightness within the canister coupling device.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the main parts of an installed state of an embodiment of the present invention. FIG. 2 is a schematic diagram showing the entire installation state of the embodiment. FIG. 3 is a plan view showing the sampling device of the present invention. FIG. 4 is a partially enlarged sectional view of FIG. 1. FIGS. 5(a), 5(b), and 5(c) are operational state diagrams of the embodiment. Figure r56 is a schematic plan view of another embodiment. Figures f57 to 11 are diagrams showing the prior art. Figure 1 Figure 2 Figure 3 1: Melting furnace 2: Canister coupling device 3: Canister 4: Sampling device 5: Frame
6: Lever 7: Drive part 8: Receiver is plate 9: Pot agent Patent attorney Tsuji 2nd department (1 idiot) Figure Figure Figure Figure Figure Figure Figure (Q)

Claims (1)

[Claims] A device that is provided with a coupling device connected to a container on the lower side of the melting furnace, allows molten glass to flow down from the melting furnace to the container, and samples the molten glass on the way down, and is removably placed on the top of the container. It consists of a frame whose upper part is in close contact with the coupling device, a moving means provided on the frame, and a sampling pot removably attached to a lever provided on the moving means, and the frame is attached together with the container. A molten glass sampling device characterized in that it is movable.