JPH0797158B2 - Radioactive waste transfer device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a radioactive waste transfer device for transferring radioactive waste.

[Conventional technology]

Generally, radioactive waste generated from nuclear power plants, etc.
It is roughly classified into three types: gas, liquid and solid, and the radioactivity is classified into high level, medium level and low level.

Conventionally, among low-level fixed wastes, combustibles are incinerated and then stored in drums.

However, as the amount of solid waste increases, a large amount of ash is generated after the incineration process, and the storage amount is increasing year by year. Therefore, the above-mentioned process naturally has its limit.

Therefore, the treatment of the solid waste (incineration ash) using microwaves is disclosed in, for example, Japanese Patent Application Laid-Open No. 55-143380.

The radioactive waste processed by these microwave melting devices is a so-called incineration ash obtained by temporarily incinerating the radioactive waste discharged from a nuclear power plant or the like.

The incinerated ash is stored in drums and transported to the treatment plant. At the treatment plant, the incineration ash is pneumatically transported from the drum, the air and the incineration ash are separated by using a cyclone, a filter (cloth, paper), etc., and the incineration ash is stored in the hopper and supplied to the feeder as needed. ing.

[Problems to be solved by the invention]

However, in the method described above, since the incinerated ash incinerated in the incinerator is transferred through the drum can, the incinerated ash is scattered to the outside when the incinerated ash is packed in the drum can or is taken out. , May cause radioactive contamination.

[Object of the Invention]

The present invention solves the above problems, and an object of the present invention is to provide a radioactive waste transfer device that can transfer the incinerated ash in the incinerator to the next step without scattering.

[Means for solving problems]

An incineration ash transfer pipe that is formed in the lower part of the incinerator and has one end opened to a storage unit that temporarily stores incineration ash incinerated in this incinerator, and the other end of this incineration ash transfer pipe that transfers the incineration ash A cylindrical ceramic filter that is connected and separates the incinerated ash from the incinerated ash transfer pipe, and is arranged at a constant interval on the outer circumference of the cylindrical ceramic filter and is attached to the outer circumference of the cylindrical ceramic filter. A gas separation device in which a separation plate for scraping off incinerated ash and a rotating means for rotating the cylindrical ceramic filter are arranged, and the gas separation device connected to the gas separation device and separated from the inside of the cylindrical ceramic filter. Suction means for sucking air in the device and transferring the incinerated ash in the storage section to the gas separation device through the incineration ash transfer pipe, and a suction plate located below the gas separation device and scratched by a separation plate. It is intended a container containing a taken radioactive waste.

[Operation of the invention]

In the present invention, by operating the suction means, the incineration ash temporarily stored in the incinerator passes through the incinerator ash transfer pipe together with suction air, and is supplied into the gas separation device,
In this gas separation device, the gas separation device is attached to the outer peripheral surface of the cylindrical ceramic filter rotated by the rotating means, and is scraped off by the separation plate arranged at a constant interval on the outer periphery of the cylindrical ceramic filter. It is housed in a container located at the bottom.

Example of Invention

An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of the radioactive waste transfer device of the present invention. In the figure, reference numeral 1 indicates an incinerator for incinerating radioactive waste. A storage unit 3 for temporarily storing the incineration ash 2 incinerated in the incinerator 1 is formed below the incinerator 1. Dampers 4 and 5 that are opened and closed by a motor or the like are formed above and below the storage unit 3. The storage section 3 is open at one end of an incineration ash transfer pipe 6 for transferring the incineration ash 2 by suction air generated by the suction means 28, and a filter 7 is arranged at the tip thereof. In the figure, reference numeral 8 indicates a gas separating device for separating the incinerated ash 2 from the incinerated ash transfer pipe 6 from the suction air. The ends are connected. A valve 16 is arranged in the incineration ash transfer pipe 6. In the container body 13, a rotary filter 19 made of a cylindrical porous body is arranged. The rotary filter 19 is made of ceramics, Pearlcon (registered trademark of Daicel Chemical Industries), or the like. A sprocket 21 for rotating the rotary filter 19 and a chain on the sprocket 21 are provided on the rotary filter 19.
A geared motor 25 connected via 23 is arranged. Further, one end of a pipe 27 for sucking air in the rotary filter 19 is connected to the upper part of the rotary filter 19, and the other end is connected to a suction means 28 such as a blower. A separation plate for scraping off the incineration ash 2 attached to the outer periphery of the rotary filter 19 is provided on the outer periphery of the rotary filter 19.
29 is disposed at a constant interval from the rotary filter 19 such as 1 mm. The bottom of the container body 13 is
It opens at 31. The hopper 31 supplies the incineration ash 2 to, for example, a microwave melting device, an arm melting device, etc., which are not shown.

In the radioactive waste transfer device configured as described above, the incineration ash 2 in the storage unit 3 formed in the lower portion of the incinerator 1 is the filter 7, the incineration ash together with the suction air generated by operating the suction means 28. After being supplied to the container body 13 through the transfer pipe 6, the rotary filter 19 made of a cylindrical porous body disposed inside the container body 13 is attached to the outer periphery as shown in FIG. Then, when the adhesion layer 33 is formed and the thickness thereof exceeds, for example, 1 mm, it is scraped off by the separation plate 29 arranged at a constant interval on the outer periphery of the rotary filter 19. The radioactive waste scraped off is dropped from the lower part of the container body 13 into the hopper 31.

On the other hand, as shown by the arrow in FIG. 2, the suction air that has passed through the rotary filter 19 made of a porous body is sucked by the suction means 28 and discharged to the outside.

That is, in the radioactive waste transfer device configured as described above, the incineration ash 2 in the storage unit 3 passes through the incineration ash transfer pipe 6 together with the suction air generated by operating the suction means 28, and the gas separation device 8 is provided. The gas is separated from the incineration ash 2 and the suction air by being supplied into the inside. Therefore, it is not necessary to transfer the incinerated ash 2 incinerated in the incinerator 1 through the drum as in the conventional case, and the incinerated ash 2 is scattered to the outside when the incinerated ash 2 is packed in or taken out from the drum. The risk of causing radioactive contamination can be reliably eliminated. Particularly, since a gap of, for example, about 1 mm is provided between the separation plate 29 and the outer periphery of the rotary filter 19, the incineration ash 2 attached to the outer periphery of the rotary filter 19 exceeds 1 mm in the separation plate 29. Can be scraped off at times. That is, since the separation plate 29 does not contact the outer circumference of the rotary filter 19, there is no fear that the separation plate 29 scrapes the outer circumference of the rotary filter 19. Therefore, the rotary filter 19 is scraped by the separation plate 29,
It is possible to avoid an unexpected situation where radioactive waste leaks from the rotary filter 19.

Further, in the radioactive waste transfer device configured as described above, since the filter 7 is arranged at the tip of the incineration ash transfer pipe 6, foreign matter such as metal and gravel is separated by the filter 7, and for example, incineration with a diameter of 10 mm or less. It becomes possible to transfer only the ash 2 to the gas separation device 8, and the feeder in the subsequent process,
It is possible to easily select a valve or the like. In this case, the hopper 5 is opened at an appropriate time so that only foreign matters such as metal and gravel are stored in the container 33.

Since a storage unit 3 is conventionally formed in the lower portion of the incinerator 1, the present invention can be easily implemented by opening the incineration ash transfer pipe 6 in the storage unit 3. Further, by forming the incineration ash transfer pipe 6 with a heat-resistant member, the incineration ash 2 can be easily transferred even when the temperature of the incineration ash 2 is high.

〔The invention's effect〕

As described above, according to the present invention, the air in the gas separation device is sucked from the inside of the cylindrical ceramic filter by the suction air generated by the suction means connected to the gas separation device, and the incineration ash in the storage unit is incinerated. Since the incinerated ash is not scattered to the outside because it is transferred to the gas separation device via the ash transfer pipe, the incinerated ash separated by the gas separation device will be reliably collected in the container, and radioactive contamination will occur. It is possible to reliably eliminate the risk of causing Furthermore, since a constant space is provided between the separation plate and the outer circumference of the cylindrical ceramic filter, the separation plate scrapes off the incineration ash adhering to the outer circumference of the cylindrical ceramic filter when it exceeds the predetermined distance. However, since there is no contact with the outer periphery of the cylindrical ceramic filter, there is no risk of the outer periphery of the cylindrical ceramic filter being scraped by the separating plate. Therefore, it is possible to avoid an unexpected situation in which the cylindrical ceramic filter is scraped by the separation plate and the radioactive waste leaks from the cylindrical ceramic filter to the outside.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view showing an embodiment of the radioactive waste transfer device of the present invention, and FIG. 2 is a vertical sectional view showing the vicinity of the rotary filter of FIG. 1 ... Incinerator, 2 ... Incinerator ash, 3 ... Storage unit, 6 ... Incinerator ash transfer pipe, 8 ... Gas separation device.

Claims (1)

[Claims] 1. One end is opened to a storage part formed at the bottom of the incinerator for temporarily storing incinerated ash incinerated in the incinerator,
An incineration ash transfer pipe for transferring the incineration ash, a cylindrical ceramic filter connected to the other end of the incineration ash transfer pipe for separating the incineration ash from the incineration ash transfer pipe, and a cylindrical ceramic filter A gas separation device, which is arranged at a constant interval on the outer periphery and has a separation plate for scraping off the incineration ash adhering to the outer periphery of the cylindrical ceramic filter and a rotating means for rotating the cylindrical ceramic filter. And being connected to this gas separation device, sucking air in the gas separation device from the inside of the cylindrical ceramic filter,
Suction means for transferring the incinerated ash in the storage section to the gas separation device through the incineration ash transfer pipe, and a radioactive waste located below the gas separation device and scraped by a separation plate. A radioactive waste transfer device comprising: a container.