JPH0642000B2 - Equipment for supplying radioactive waste in the furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a furnace for melting radioactive waste (incinerated ash) after incineration treatment using microwaves, in which radioactive waste after incineration treatment ( It relates to a device for supplying incinerated ash).

[Conventional technology]

Radioactive wastes generated from nuclear power plants are roughly classified into three types: gas, liquid, and solid, and the radioactivity is classified into high level, medium level, and extremely low level.

Conventionally, it is difficult to incinerate water-containing waste, synthetic resin products such as vinyl chloride, vinyl acetate, used ion-exchange resin (waste resin), filter sludge (filter aid), etc. in solid waste, so press It was compressed and stored in a drum can or stored as it was in a tank.

However, since the solid waste is generated in a large amount and the storage amount is increasing year by year, the above-mentioned treatment has its own limit.

Therefore, the solid waste has come to be processed using microwaves (for example, Japanese Patent Laid-Open No. 56-80691).
JP-A-58-173376, JP-A-58
-189599, JP-A-59-27495, etc.).

As the radioactive waste treated by these microwave melting devices, so-called incinerated ash that has been incinerated once is used, instead of directly treating the radioactive waste discharged from the nuclear reactor.

Then, the incinerated ash is stored in a drum can and carried to the treatment plant. At the treatment plant, the incinerated ash was transported by air, the air and the incinerated ash were separated by using a cyclone, a filter (cloth, paper, etc.), the incinerated ash was stored in the hopper, and was supplied to the feeder as needed. .

[Problems to be solved by the invention]

However, in the method as described above, since a cyclone, cloth or paper filter is used as a means for separating air and incineration ash, it is difficult to achieve a separation efficiency of 99.99% or more. Therefore, radioactivity may leak from these separation means. In addition, there is a drawback that clogging easily occurs.

[Object of the Invention]

The present invention has been made to solve such conventional problems, and an object thereof is to make it possible to efficiently supply radioactive waste (incineration ash) carried into a treatment plant to a furnace. It is an object of the present invention to provide an in-furnace supply device.

[Means for solving problems]

The radioactive waste in-reactor supply device according to the present invention includes a mechanism for holding a container containing radioactive waste, a lid holding mechanism for adsorbing and removing a lid of the container, and rotating the container at a desired angle. And a container closing mechanism that is connected to the suction device and is configured to raise and lower the suction device in a state in which the opening of the container is closed, and the suction device is connected to the suction device. A filter device in which a rotary filter is arranged and separators are arranged at desired intervals on the outer periphery of the rotary filter, a hopper connected to the lower part of the filter device, and a hopper connected to the lower part of the hopper, and a screw conveyor is provided inside. It is composed of a feeder arranged with.

[Operation of the invention]

In the present invention, since radioactive waste (incineration ash) carried in a container such as a drum can is sucked by a vertically movable suction device, the incineration ash in the drum can can be transferred without being scattered. Further, since the incinerated ash absorbed is adsorbed by the rotary filter having a separation efficiency of 99.99% or more, even if the air as a transport medium is filtered and released to the outside, the radioactivity leaks from the rotary filter. There is no fear. Further, since the incineration ash adsorbed on the rotary filter is separated by the separator so as not to exceed the predetermined thickness, the pressure loss is not increased. Further, since the incineration ash adsorbed by the rotary filter is separated and stored in the hopper and supplied from the hopper to the furnace main body through the feeder, it is possible to feed the quantified amount.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

In the figure, reference numeral 1 is a drum can, in which granular powdery radioactive waste is stored. This radioactive waste is obtained by incineration of solid waste. A lid 2 is attached to the drum can 1. This drum can 1
Are loaded by the automated guided vehicle 3.

4 is a microwave melting device (furnace body) 5 for this drum can 5
5 is an elevating device for carrying to a pedestal 56 provided with 5, and is operated by hydraulic pressure. Reference numeral 5 is a conveyor for loading the drum can 1 loaded by the elevating device 4 onto the mount 56. This conveyor 5 is a geared motor 5
The rotation is controlled by 7.

Reference numeral 6 denotes a mechanism for holding the drum can 1 during the work of transferring the incineration ash in the drum can 1, including a drain-shaped receiving portion 7, and a hydraulic cylinder 8 arranged between the receiving portion 7 and the frame 9. ,
An elastic rubber tube 10 having a diameter corresponding to the outer shape of the drum can 1, and a support member 11 for restraining the outer periphery of the rubber tube 10 and connecting it to the frame 9. Then, the holding mechanism 6 moves the drum can 1 to the transfer position of the incineration ash while placing the drum can 1 on the drain-shaped receiving portion 7 and then ascending by the hydraulic cylinder 8 during the work. A rubber tube 10 is pressed against the drum can 1 and supported by the frame 9.

Reference numeral 12 denotes a lid holding mechanism that sucks and removes the lid 2 of the drum can 1, and the suction plate 13 that sucks the lid 2 by the suction force of the suction nozzle 58 attached to the lower portion of the air cylinder 14.
And a device 16 for rotatably supporting the arm 15, and the suction plate 13 sucks the lid 2 and rotates 90 degrees. Then, the opening of the drum can 1 is opened so that the incinerated ash in the drum can 1 is transferred, and the lid 2 is held in a sucked state until all of the incinerated ash in the drum can 1 is transferred. When this work is completed, the work is rotated to the original position again to cover the drum can 1 with the lid 2.

Reference numeral 17 is a suction device for sucking incinerated ash in the drum can 1,
A plurality of suction nozzles 18 are provided at the tip. A gear 59 is attached to the suction device 17, and the geared motor 19
And is rotated by this geared motor 19. The geared motor 19 is connected to the LM guide 20 via a bracket 21, and is configured to move up and down by the LM guide 20.

Reference numeral 22 denotes a container closing mechanism, which includes a lid 24 connected to the suction device 17 via a bearing mechanism 23 and a bearing mechanism 2
Lifting mechanism 25 connected via an arm 26 connected to
It consists of and. This lifting mechanism 25 is used for the arm 2
6 and a mounting bracket 29 which is disposed in the connector 27 and has substantially U-shaped ends.
A ball spline 28 rotatably held by
A ram 60 is connected to the ball spline 28 via a bracket 31, and a main body is provided on a hydraulic cylinder 30 attached to a connecting tool 27 and a mounting bracket 29.
It is composed of a chain coupling 32 provided on the upper part of the ball spline 28 and a rotary actuator 33 provided on the upper part of the chain coupling 32.

34 is an elevating mechanism for elevating the aspirator 17,
Bearing mechanism 35 provided on the outer periphery of suction device 17, arm 36 connected to this bearing mechanism 35, ball screw 37 connected to this arm 36, and this ball screw 3
7 and a geared motor 38 for rotating 7.

In the present embodiment, the lifting mechanism 25 is the container closing mechanism 2
3 up and down, suction device 17 up and down, suction device lifting mechanism 3
It is configured to be able to move up and down 4 at the same time.

Reference numeral 39 is a pipe for sending the incinerated ash sucked by the suction device 17 to the next step.

Reference numeral 40 denotes a filter device that adsorbs and separates incineration ash that is pneumatically transported by the pipe 39, and is a cylindrical container body 41 and a cylinder that is rotatably arranged in the container body 41 at a desired interval. Shaped ceramic filter 42 and disposed in the vicinity of the ceramic filter 42, and when the thickness of the incinerated ash adsorbed by the ceramic filter 40 exceeds a predetermined value, the incinerated ash is brought into contact with the incinerated ash to constantly control the thickness Separation plate 43 that functions as a ceramic filter 4
2 and a sprocket 44 for rotating the ceramic filter 42 and the sprocket 4
4 is connected via a chain 45 to a geared motor 46
And a pipe 47 communicating with the inside of the ceramic filter 42 and sucking air from the inside of the ceramic filter 42. It should be noted that various filters are inserted in the pipe 47 in order to prevent radiation from leaking.

Reference numeral 48 is a hopper provided below the filter device 40. The rotary valve 4 is provided below the hopper 48.
9 are connected to each other, and opening / closing of the rotary valve 49 is controlled by a geared motor 50.

Reference numeral 51 denotes a feeder provided below the rotary valve 49, which includes a screw conveyor 52 rotatably arranged in the tubular body 53, and a geared motor 54 that controls the rotation of the screw conveyor 52.

Reference numeral 55 is a furnace body to which the feeder 51 is connected. The furnace main body 55 is arranged on a pedestal 56, and at the lower part of the pedestal 56, a glow pox 61 is provided for holding the retort up and down and for melting the incineration ash in the retort.

Next, the present invention will be described according to its processing steps.

Solid waste discarded at a nuclear power plant or the like is once incinerated and then filled in the drum can 1. Then, as shown in FIG. 1 and FIG. 2, the drum can 1 is carried in by an automatic guided vehicle 3. After that, the drum can 1 is lifted by the lifting device 4 and placed on the conveyor 5. The conveyor 5 is provided with a receiving portion 7 having a drain-like shape, and the drum can 1 is moved by a geared motor 57. When the drum can 1 comes to a predetermined position, a sensor (not shown) senses it and stops the movement by the conveyor 5.

Next, the drum can 1 is lifted by the hydraulic cylinder 8,
When the drum can 1 protrudes above the support member 11, a sensor (not shown) senses this and stops the movement. At this time, the rubber tube 1 provided on the support member 11
In 0, the air is removed and the diameter is reduced. When a sensor (not shown) senses that the drum can 1 has reached the set position, air is pumped from an air supply device such as a compressor to inflate the rubber tube 10 and press it into contact with the drum can 1.

Thus, since the drum can 1 is supported and fixed by the hydraulic cylinder 8 and the periphery thereof is restrained by the rubber tube 10, the drum can 1 does not move carelessly during the processing in the next step.

When this supporting and fixing process is performed, the lid suction mechanism 6 is moved to the upper part of the drum can 1 by the moving mechanism 16 as shown in FIGS. 3 and 4, and the suction port 13 is lowered to lower the lid 2. When the air cylinder 14 comes into contact with the air cylinder 14,
The lid 2 is sucked by. Then, after moving upward in this state, it is rotated 90 degrees to open the opening of the drum can 1.

When the lid 2 of the drum can 1 is removed, as shown in FIG. 5, the hydraulic cylinder 30 is immediately driven to lower the lid 24 to close the opening of the drum can 1. At this time,
The suction nozzle 18 of the suction device 17 is located near the lid 24, and the geared motor 19 for raising and lowering the suction device 17 is also located at the position shown by the broken line in FIG.

Next, the suction device 1 is driven by driving an external suction device (not shown).
Inhalation ash can be sucked from the suction nozzle 18 of No. 7 and the suction device 17 is driven by driving the geared motors 19 and 38.
While slowly rotating, descend. As a result, the incinerated ash in the drum can 1 is sucked through the nozzle 18 of the suction device 17 and pneumatically transported to the filter device 40 through the pipe 39.

At this time, in the filter device 40, the ceramic filter 42 is rotated at a desired speed by the geared motor 46 as shown in FIG. 6, and air is sucked from the inside of the ceramic filter 42 by an external suction device (not shown). Has been done. Therefore, the incineration ash pneumatically transported by the pipe 39 is adsorbed by the ceramic filter 42, and the air is exhausted to the outside of the system through the pipe 47. Therefore, the incineration ash is adsorbed on the entire outer peripheral surface of the ceramic filter 42 in a substantially uniform layer. When the thickness of the layer of incinerated ash reaches a predetermined value (about 1 mm), the separation plate 43 comes into contact with it to separate the incinerated ash and drop the incinerated ash into the hopper 48.

Thus, the incineration ash stored in the hopper 48 is fed to the feeder 5 by the rotary valve 49 as shown in FIG.
1 is supplied. The rotary valve 49 is controlled according to the amount of incinerated ash supplied to the furnace body 55, and is also opened and closed by a geared motor 50 controlled according to the processing status of the ceramic filter 42. And the feeder 51
Then, the desired incineration ash is supplied to the furnace main body 55 by the screw conveyor 52 rotated by the geared motor 54.

Here, too, the geared motor 54 is controlled by the control device that manages the molten state in the furnace body 55.

When the transfer of the incineration ash in the drum can 1 is completed, the valve 62 is closed and the suction process by the suction device is stopped. Then, the holding of the drum can 1 is released in the reverse order of the processing steps described above, and the drum can 1 is carried out to the outside. That is, the ram 60 of the hydraulic cylinder 30 of the lifting mechanism 25 is contracted to remove the suction device 17 and the lid 24 from the drum can 1. After that, drum can 1
Rotate the suction mechanism 6 that was sucking the lid 2 of 90 degrees,
Position it again on the opening of the drum can 1 and
4 is lowered and the lid 2 is pressed against the drum can 1 to close the opening of the drum can 1. Then, the air in the rubber tube 10 is evacuated, the ram of the hydraulic cylinder 8 is extended, the drum can 1 is placed on the conveyor 5, moved by the conveyor 5 to the position of the lifting mechanism 4, and lowered by the lifting device 4. ,
It is carried out by the automatic guided vehicle 3.

As described above, according to this embodiment, since the lid of the loaded drum can is opened and then the opening is immediately closed, there is no risk of incineration ash scattering in the drum can. It is possible to minimize the leakage of radioactivity at the time.
Further, since a suction device is used as the transfer means from the drum can and a ceramic filter is used as the separation means from the air and the incinerated ash, there is no risk of leakage of radioactivity to the outside of the system during transfer. Furthermore, in the suction work with a ceramic filter, it is made to adhere to the filter surface positively, but a separation plate (scraper) is attached to prevent it from adhering to a certain level (about 1 mm), so it is scraped off. The layer is used as a separation surface for air and powder to enhance the separation efficiency. Moreover, since the adsorption layer (precoat) is about 1 mm, the pressure loss increases, but it is possible to prevent the radioactivity of the radioactive substance from being released into the atmosphere, which is excellent in safety. Further, by mounting the inlet to the ceramic filter tangentially to the cylindrical container body, the container body of the filter can have a cyclone separation effect.

In addition, in the said Example, although the case where a suction device was rotated when sucking incineration ash was demonstrated, you may make it rotate a drum can. Further, although the ceramic filter is used as the rotary filter for adsorbing and separating the incinerated ash, the present invention is not limited to this, and any filter may be used as long as it can perform the same operation.

〔The invention's effect〕

As described above, according to the present invention, since the transporting air and the granular powder are separated by the rotary filter and the granular powder is stored in the hopper, the separation efficiency between the air and the granular powder is extremely high. . In addition, since the granular powder attached to the rotary filter is always kept at a thickness of 1 mm by the separator (scraper), the pressure loss can be kept constant.

[Brief description of drawings]

FIG. 1 is a front view showing the entire apparatus for melting radioactive waste to which the apparatus according to an embodiment of the present invention is applied, FIG. 2 is a plan view thereof, and FIGS. 3 to 6 show details thereof. FIG. 3 is a side view showing the step of holding the carried-in container, FIG. 4 is a plan view showing the step of adsorbing and holding the cap of the container, and FIG. 5 is a step of sucking incinerated ash. FIG. 6 is a side view showing a process of adsorbing and separating incineration ash by a ceramic filter. 1 ... Drum canister, 6 ... Holding mechanism, 10 ... Rubber tube, 12 ... Lid suction mechanism, 17 ... Suction device, 22 ... Lid closing mechanism, 25 ... Lifting mechanism, 40 ... Filter device,
42 ... Ceramic filter, 43 ... Separation plate, 48 ...
... hopper, 51 ... feeder, 55 ... furnace body, 61 ...
… Glow Box.

Claims (1)

[Claims] 1. A mechanism for holding a container containing radioactive waste, a lid holding mechanism for adsorbing and removing a lid of the container to rotate the container at a desired angle, and an aspirator which is vertically movable in the container. And a container closing mechanism that is connected to this aspirator and that raises and lowers the aspirator with the opening of the container closed, and connects the aspirator with the aspirator, and arranges a rotary filter inside and A filter device having separators arranged at desired intervals on the outer periphery of the formula filter, a hopper connected to the lower part of the filter device, and a feeder connected to the lower part of the hopper and having a screw conveyor inside. Characteristic radioactive waste in-reactor supply device.