JPS6034080B2 - Radioactive waste processing equipment - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to improvements in radioactive waste treatment equipment.

[Background of the invention]

The waste liquid concentrated in the radioactive waste liquid concentrator is dried in a centrifugal thin liquid dryer and pulverized.d The steam generated during the drying process of this radioactive concentrated waste liquid is led into a steam removal tower, Nuclides and mist in the steam are removed in this steam decontamination tower section.

In order to remove the nuclides and mist in the steam, a large amount of water must be constantly supplied to the steam decontamination tower, but conventionally, the water supplied to the steam decontamination tower was brought in from outside. As a result, the amount of secondary waste (radioactive waste liquid) generated as a result of the decontamination work described above is extremely large, which not only increases the operational load required for waste treatment, but also increases the amount of waste The problem is that the capacity of the processing equipment becomes large.

In addition, the steam removed in the steam decontamination tower is led to a condenser and condensed, and this condensed water is discharged outside from the condenser, but the condensed water contains radioactive sodium sulfate, Persistent solids such as boric acid, cladding, or ion exchange f
It contained pieces of bedding fat, etc., so it was necessary to install condensate treatment equipment equipped with filters and demineralizers, and to treat the condensed water with this condensate treatment equipment before releasing it to the outside. .

[Purpose of the invention]

The present invention has been made in consideration of the above points, and includes a centrifugal thin film dryer for drying waste liquid concentrated in a concentrator, and a steam beam removal tower for removing steam generated in the centrifugal thin film dryer. and a condenser for condensing the steam removed by the steam decontamination tower, to prevent secondary waste from increasing due to decontamination work in the steam decontamination tower. In addition to eliminating the need for treatment equipment for the condensed water generated from the condenser, the condensed water discharged from the steam decontamination tower can also be treated extremely efficiently, making it easy to handle and reducing the amount of stored water. The purpose of this project is to obtain a radioactive waste treatment device that can

[Summary of the invention]

In order to achieve the above object, the present invention provides a centrifugal thin film dryer that dries the waste liquid concentrated in a concentrator, and a steam decontamination system that decontaminates the vapor containing particulate nuclides and mist generated in the far zero thin film dryer. In a radioactive waste treatment equipment comprising a dye tower and a condenser that condenses the steam decontaminated in the steam decontamination tower to produce condensed water, the entire amount of condensed water condensed in the condenser is converted into the steam. A path for introducing the condensed water into the steam decontamination tower, a means for bringing the condensed water into contact with the steam flowing from the bottom to the top in the steam decontamination tower, and a method for capturing particulate nuclides and mist in the steam in the steam decontamination tower. The present invention is characterized in that a path is provided for returning condensed water from the waste liquid outlet of the steam removal tower to the condenser, and the condensed water is re-condensed and then supplied to the centrifugal thin film dryer.

[Embodiment of the Invention] The present invention will be explained below with reference to an embodiment of the drawings.

In the figure, 1 is a remote thin film dryer, 2 is a concentrated waste liquid supply □ which supplies concentrated waste liquid from the radioactive waste liquid concentrator (not shown) side to the centrifugal thin film dryer 1, and 3 is processed by the centrifugal thin film dryer 1. 4 is a steam outlet provided at the upper part of the centrifugal thin film dryer 1, 5 is a steam decontamination tower, 6 is a steam inlet of the steam decontamination tower 5, and 7 is a steam decontamination tower. 8 is a waste liquid outlet provided at the bottom of the steam decontamination tower 5; 9 is a steam outlet provided at the top of the steam decontamination tower 5; 1 is a steam decontamination tower A condenser condenses steam from which particulate nuclides and mist have been removed in 5 parts, 11 is a steam inlet of the condenser 10, 12 is a condensed water outlet of the condenser 10, and 13 is a condensed water inlet of the steam stripping tower 5. . In the above configuration, the waste liquid concentrated in the radioactive waste liquid concentrator is guided from the concentrated waste liquid supply port 2 into the far thin film dryer 1, and is dried in the far thin film dryer 1 section, Powdered.

Steam containing particulate nuclides and mist generated during the drying process of this radioactive concentrated waste liquid is introduced into the steam beam removal tower 5 through the steam outlet 4 of the centrifugal thin film dryer 1 and further through the steam inlet 6 of the steam decontamination tower 5. It will be destroyed. In the steam removal tower 5, the entire amount of condensed water generated in the condenser 10 is transferred to the condensed water inlet 1 through an introduction path.
3, the condensed water is brought into contact with the steam flowing from below to above in the steam removal tower 5 on each perforated plate 7, and the condensed water itself captures particulate nuclides and mist in the steam, and then passes through the waste liquid outlet. After being discharged from the radioactive waste liquid concentrator and returned to the radioactive waste liquid concentrator,
It is reconcentrated and fed again to the centrifugal thin film dryer. The steam in the steam decontamination tower 5 from which particulate nuclides and mist have been removed as described above is led from the steam outlet 9 to the steam inlet 11 of the condenser 10, and is condensed there. After all of this condensed water comes out of the condensed water outlet row 2, it is led to the steam decontamination tower 5 through the condensed water inlet 13 of the steam decontamination tower 5, and the above cycle is repeated thereafter.
Therefore, in the embodiment of the present invention having the above configuration, the decontamination water supplied to the steam decontamination tower 6 is the condensed water from the condenser 10 that constitutes the closed system of the steam decontamination tower 5. Since no external water supply is required, secondary waste will not increase as a result of the decontamination work of the steam decontamination tower 5. Further, since the entire amount of condensed water generated from the condenser 10 is led to the steam decontamination tower 5, equipment for treating the condensed water generated from the condenser 10 is not required. Furthermore, the condensed water discharged from the steam decontamination tower 5 is returned to the radioactive waste liquid concentrator, reconcentrated, and then dried again in the centrifugal thin film dryer. Condensed water can be treated extremely efficiently without increasing the amount of water. Moreover, since the condensed water is not stored as a waste liquid but as a dry powder, it is easy to handle and the amount of storage can be significantly reduced. [Effects of the Invention] As detailed above, the present invention provides a centrifugal thin film dryer for drying waste liquid concentrated in a concentrator, and a steam beam removal tower for removing steam generated in the centrifugal thin film dryer. and a condenser for condensing the steam decontaminated in the steam decontamination tower, secondary waste increases due to the beam removal work in the steam decontamination tower. In addition, it is possible to completely eliminate the need for treatment equipment for condensed water generated from the condenser.

Further, the condensed water discharged from the steam decontamination tower can be treated very efficiently, making its handling easy, and the amount of condensed water stored can be significantly reduced.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of a waste treatment system of a radioactive waste treatment apparatus showing an embodiment of the present invention. 1... Centrifugal thin film dryer, 5... Steam decontamination tower, 7... Perforated plate without weir, 8... Waste liquid outlet,
10...Condensing machine.

Claims (1)

[Claims] 1 A centrifugal thin film dryer that dries the waste liquid concentrated in the concentrator, a steam decontamination tower that decontaminates the vapor that is generated in the centrifugal thin film dryer and contains particulate nuclides and mist, and a steam decontamination tower that decontaminates. A radioactive waste treatment apparatus comprising: a condenser that condenses the steam produced by the condenser into condensed water; A means for bringing this condensed water into contact with steam flowing from below to above in the steam decontamination tower, and a means for bringing the condensed water that has captured particulate nuclides and mist in the steam in the steam decontamination tower from the waste liquid outlet of the steam decontamination tower. A radioactive waste processing apparatus characterized in that a path is provided to return the condensed water to the concentrator, and the condensed water is reconcentrated and then supplied to the centrifugal thin film dryer.