JPS6019479B2 - Fusing dross processing equipment for radioactive large solid waste - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a melt-cut dross processing apparatus for radioactive large-sized solid waste.

Various large equipment used in nuclear power plants are radioactive, so if they break down, reach the end of their service life, or are modified, they must be partially or completely disposed of. is necessary.

At this time, discarding some or all of the various large-sized devices as they are will cause problems in packaging, transportation, and disposal, so they must be cut into small pieces and packed compactly.

In order to cut the various types of large-scale equipment into pieces, it is effective to cut the pieces on a workbench in a dismantling cell using a plasma cutter, gas cutter, arc cutter, or the like, which has a high cutting speed.

However, since fusing using these fusing machines produces a large amount of fusing dross, this fusing dross must also be disposed of.

In order to dispose of this melted dross, it was considered to dispose of each workbench separately, but this method would increase the amount of waste to be processed and would be troublesome to pack and transport for disposal, so it would be difficult to dispose of it by remote control. I couldn't come up with anything that could be called a rational disposal method.
The present invention has been made to eliminate the drawbacks of such melted dross disposal processing, and when radioactive large solid waste is melted by a plasma cutter or the like on a workbench, only the cut dross is allowed to fall into the cooling water. It is an object of the present invention to provide a melt-cut dross processing apparatus characterized in that the dross is pulverized by a swirling flow at the same time as the dross is pulverized, and the dross pulverized into pulverized dross is filled into a processing container.

An embodiment of the melt-cutting Tadros processing apparatus for radioactive large-scale corporate waste according to the present invention will be explained below with reference to the drawings. 1 is a lattice-shaped waste face-cutting workbench installed in a radioactive large-scale solid waste dismantling cell (not shown). The workbench 1 is rotated by a rotating device (not shown) and can be raised and lowered by a lifting device (not shown).

A cylindrical concrete melt-cut dross processing chamber 4 is provided below the workbench 1, and a hopper-shaped dross, for example, is provided in the upper part of the processing chamber 4. A cooling water tank 6 is formed by providing a cooling water tank 6, and in the cooling water tank 6, a number of swirling flow generators are installed at regular intervals on the inner circumferential side of the annular pipe 7. A cooling water injection pipe 9 with a nozzle 8 directed diagonally downward in the tangential direction is fixed at the upper end of the dross receiver 5, and an opening/closing door 10 is provided at the discharge port 5a at the center of the lower end of the dross receiver 5. A lattice-shaped pedestal 11 is provided at the lower part of the melt-cut dross processing chamber 4, and the lower side thereof serves as a drain tank 12, and a dross processing container 13 is carried in and out from the opposing inner walls on the pedestal 11. Passages 14 and 15 are provided. The annular pipe 7 has a cooling water supply tank 16 installed at a high place.
A cooling water supply pipe 17 from the drain tank 12 is connected to the supply pipe 17, and a cooling water return pipe 19 attached to the lower part of the drain tank 12 is connected to the middle of the supply pipe 17 via a check valve 18. tube 19
A strainer 20 and a water supply pump 21 are provided in the middle. Further, an overflow pipe 22 is provided at the upper part of the cooling water tank 6.
is provided and its lower end is fitted into the drain tank 12. Next, the operation of the fusing dross processing apparatus of the present invention constructed as described above will be explained.

Radioactive large solid waste brought into the demolition cell is separated by remote control into those that can be decomposed and those that cannot be decomposed, and the waste W that cannot be decomposed is placed on the waste fusing workbench 1 as shown by the chain line in the figure. be done. Then, while the workbench 1 is appropriately rotated and raised and lowered by a rotating device and a lifting device (not shown), the waste W is melted and finely divided into appropriate sizes using a plasma cutter (not shown), and the finely divided waste is Transfer to another workbench and seal in a container. As mentioned above, when the waste W is cut by the plasma cutting machine on the waste cutting work bench 1, a large amount of melting dross is generated, but this melting dross passes through the grid-shaped work bench 1 every time it is cut. It falls into the cooling water tank 6 on the lower side.

The cooling water in this cooling water tank 6 is supplied with cooling water in advance. Cooling water flows from the tank 16 through the supply pipe 17, and cooling water stored in a drain tank I2 (to be described later) flows to the water supply pump 21.
As a result of the operation, the cooling water is merged with the cooling water in the supply pipe 17 through the return pipe 19 and is supplied to the annular pipe 7, and the cooling water is jetted out from a number of nozzles 8 facing diagonally downward in the tangential direction on the inner circumferential side. A swirling flow is provided. Therefore, the melted dross is turned into granules by rapid cooling and rotating movement on the dross receiver 5,
It gradually accumulates inside the discharge port 5a at the lower center end. Continuous jetting of cooling water from the nozzle 8 increases the amount of cooling water in the cooling water tank 6 and raises the water level, but when it reaches the overflow pipe 22 provided at the top of the cooling water tank 6, it overflows from the overflow pipe 22. Since the cooling water is drained into the drain tank 12, the cooling water does not overflow to the outside of the cooling water tank 6. When the fine-grained dross D eventually overflows from the discharge port 5a and accumulates on the dross receiver 5, a detection device (not shown) automatically operates, and the opening/closing door 10 at the lower end of the discharge port 5a is activated.
is opened as shown by the chain line, and the pongee granulated dross D is discharged and dropped. The discharged and fallen pongee granulated dross D is carried in advance into the fused dross processing chamber 4 through the passage 14 by a transfer device (not shown), and is placed in the dross processing container 13 located below the discharge port 5a. be accommodated. Then, the opening/closing door 10 at the lower end of the discharge port 5a is immediately closed as shown by the solid line. In this way, the waste W is sequentially melted on the workbench 1,
The melted dross falls into the cooling water tank 6 and is pulverized by the swirling flow, and the string granulated dross D is sequentially discharged and dropped from the discharge port 5a of the dross receiver 5 into the dross processing container 1.
3, and when it becomes full, the dross processing container 13 is carried out by a transfer device (not shown) through a passage 15 to a packing room outside the melted dross processing chamber 4, where the lid is sealed. Sent to beam removal room.

As described above, when the pongee granulated dross D is discharged and fallen from the discharge port 5a and stored in the dross processing container 13, the cooling water is also discharged and fallen and stored in the dross processing container 13, but the woven dross D is gradually discharged and fallen. As the dross D is stored, the cooling water overflows from the dross processing container 13, passes through the grid-shaped pedestal 11, and is stored in the drain tank 12 below.

The cooling water stored in the drain tank 12 is sucked into the return pipe 19 by operation of the water supply pump 21, and fine particles of dross mixed in the cooling water passing through the strainer 20 are removed. A supply pipe 17 is connected from the cooling water supply tank 16 via the water supply pump 21 and the check valve 18.
It joins with the cooling water in the cooling water tank 6, is supplied to the annular pipe 7, and is ejected from a number of nozzles 8 to give a swirling flow to the cooling water in the cooling water tank 6. In other words, most of the radioactively contaminated cooling water involved in the pulverization of port dross is circulated in a closed cycle, and a small portion is mixed with the pulverized dross D in the dross processing container 13.
It will be housed inside. In the above embodiment, the cooling water tank 6 in the upper part of the fused dross processing chamber 4 is formed of a hopper-type dross receiver 5, but the present invention is not limited to this. Further, as a swirling flow generating device for generating a swirling flow in the cooling water in the cooling water tank 6, a large number of nozzles 8 are provided at regular intervals on the inner circumferential side of the annular pipe 7 and oriented diagonally downward in the tangential direction. Although a water ejection pipe 9 is used, any type of structure that ejects cooling water may be used.
Further, the opening/closing door 10' of the discharge port 5a of the dross receiver 5 is not limited to the single-opening type shown, but may be a double-opening type or a sliding type. Furthermore, the discharge port 5
A sliding door is provided at the upper end of a, and the pongee granulated dross D
When it is fully deposited in the discharge port 5a, close the sliding door and open the opening/closing door 10 at the lower end to discharge and drop the pongee granulated dross D. If the opening/closing door 10 is closed, the sliding door 10 is opened. The fine-grained dross D may be deposited inside the discharge port 5a with the door open. In this way, it is possible to prevent a sudden decrease in cooling water due to large discharge of cooling water in the cooling water tank 6. As can be seen from the above description, according to the melted dross processing apparatus of the present invention, when radioactive large-scale corporate waste is cut on a grid-like workbench using a plasma cutter, gas cutter, arc cutter, etc. Only the melted dross passes through the grid-like workbench and falls into the cooling water tank, where it becomes fine particles due to the swirling flow of cooling water in the cooling water tank and is deposited on the bottom. Since the dross is stored in the dross treatment container sequentially from the outlet, that is, only the fused dross can be continuously converted into granulated dross and extracted, so there is no need to dispose of the fused dross for each workbench. The amount of waste to be disposed of is reduced, and packaging and transportation for disposal are simplified by pulverizing the melted dross, and dross can be disposed of by remote control in an extremely rational manner. In addition, the fused dross processing apparatus of the present invention does not discharge the radioactively contaminated cooling water that was involved in the granulation of the fused dross to the outside, but circulates it in a closed cycle and processes it again into woven dross.

Since it is used to make pongee granules from water, there is no need for waste treatment facilities for contaminated cooling water, and there is no pollution. Furthermore, with the fused dross processing device of the present invention, the inside of the dismantling cell is not contaminated by the flow of fused dross, so it is easy to clean the inside of the dismantled cell, and other waste can be disassembled by remote control without cutting. It has excellent effects such as not interfering with the work of other people.

[Brief explanation of the drawing]

The figure is a side cross-sectional view schematically showing the apparatus for treating radioactive large-sized collective waste by melting dross according to the present invention. 5 1... Workbench, 4... Melting dross processing room,
5...Dross receiver, 5a...Discharge port, 6
...Cooling water tank, 7...Annular pipe, 8...
Nozzle, 9... Cooling water injection pipe, 10...
・Opening/closing door, 11...'...cradle, 12...drain tank, 13...dross processing container, 104
, 15... Passage, 16... Cooling water supply tank, 17... Cooling water supply pipe, 18...
・・Check valve, 19...・・Cooling water return pipe, 20・…
... Strainer, 21. ．．・...Water pump, 22...
...Overflow pipe, W...Waste, D
...Pongee grained dross.

Claims (1)

[Claims] 1 A lattice-shaped waste fusing workbench is provided in the radioactive large solid waste dismantling cell, a fusing dross processing chamber is provided below it, and the upper part of the fusing dross processing chamber has an outlet that can be opened and closed at the bottom. A hopper-type dross receiver is provided to form a cooling water tank, and a cooling water injection type swirl flow generator is provided in the cooling water tank, and a grid-shaped holder is provided at the lower part of the fused dross processing chamber, and the lower part of the dross receiver is provided. is used as a drain tank, and a passage for carrying in and out of the dross processing container is provided below the discharge port at the bottom of the hopper type dross receiver on the opposing inner walls on the pedestal, and the swirling flow generating device A cooling water return pipe attached to the drain tank and equipped with a water supply pump is connected to the middle of the connected cooling water supply pipe, and an overflow pipe is provided at the upper part of the cooling water tank, and its lower end is connected to the drain tank. A melt-cut dross processing equipment for radioactive large solid waste that is connected to the equipment.