JPS6151280B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for washing radioactively contaminated clothing. In general, clothing worn in the radiation-controlled areas of nuclear power plants may be contaminated with radioactivity to some extent, so once worn, they are managed all at once, washed, and reused. Conventionally, these clothes have been washed using a so-called dry cleaning method in which stains are removed using an organic solvent using a washing device as shown in FIG. That is, 1 is a washing drum in which worn clothes are stored and brought into contact with a solvent such as trichlorethylene to remove dirt. The solvent discharged from the cleaning drum 1 is sent to the filter 3 by the pump 2, where insoluble and difficult to tolerate substances contained in this solvent are separated and collected, and a part of this solvent is It is returned to the cleaning drum 1. A part of the solvent that has passed through the filter 3 is sent to a distiller 4 to be distilled, and after removing dissolved substances, a cooler 5
is sent to and condensed. The condensed solvent is separated into gas by a separator 6, and then sent to a solvent storage tank 7 to be stored therein, and then returned to the cleaning drum 1 by a pump 8. Further, an exterior wall 9 is provided to surround the entire cleaning device, and is configured to shield radiation. By the way, such a cleaning device has the advantage that laundry wastewater containing radioactive substances is not discharged, but on the other hand, since the solvent is circulated and reused, dirt from clothes containing radioactive substances is mainly absorbed into the material inside the filter unit 3. is collected and deposited. and,
Materials with accumulated radioactive materials are replaced regularly, and used materials are disposed of as radioactive waste. By the way, since the used material taken out from the inside of the filter 3 is impregnated with a considerable amount of solvent, there is a problem that the amount of radioactive waste increases by the impregnated solvent. Moreover, this used wood is treated as solid radioactive waste, but in this case, the impregnated solvent must be removed and dried, and when the solvent is removed, radioactive materials are released along with the solvent. Because of the possibility of diffusion, special care must be taken to remove this solvent, making the process extremely troublesome. In addition, since the amount of solvent contained in used materials is considerable as mentioned above,
There were also problems in which solvent was wasted and the efficiency of solvent usage was reduced. The present invention has been made based on the above circumstances, and its objectives are to reduce the amount of used materials taken out from the reactor as radioactive waste, to facilitate its disposal, and to provide a solution to The purpose of the present invention is to obtain a washing device for radioactively contaminated clothing that can increase the efficiency of use of radioactive materials. The present invention will be described below with reference to an embodiment shown in FIG. In the figure, 101 is a washing drum, and clothes worn in a radiation controlled area are stored in this washing drum 101. A solvent such as trichlorethylene is supplied into the cleaning drum 101, and the solvent is configured to come into contact with clothing and remove stains therefrom. The solvent discharged from this cleaning drum 101 is sent to a filter 105 via a pipe 104 by a pump 103. The filter 105 is configured to filter and collect insoluble/slightly soluble substances suspended in the solvent, and to regenerate this solvent. The solvent passed through the filter 105 is returned to the cleaning drum 101 via pipes 106 and 107.
Further, a part of the solvent filtered through the filter 105 is sent to the distiller 110 via a pipe 109.
The distiller 110 is configured to distill the solvent and remove dissolved substances.
The solvent vapor discharged from the distiller 110 is sent to the cooler 111 and condensed. The solvent that has exited the cooler 111 is separated into vapor by a separator 112 and stored in a solvent storage tank 113. Note that the separated solvent vapor is transferred to a cooler 11.
It is returned to 1. And this solvent storage tank 11
The solvent stored in the cleaning drum 3 is configured to be returned to the cleaning drum 101 by a pump 114. In addition, such a cleaning device also includes a material drying mechanism 1.
08 is provided, and hereinafter this material drying mechanism 1
The configuration of 08 will be explained. That is, the above-mentioned filter 1
05 upstream piping 104 and downstream piping 106
are provided with switching valve mechanisms 115 and 116, respectively. These switching valve mechanisms 115, 1
A gas circulator 117 is connected to each of the gas circulators 16 . The switching valve mechanisms 115 and 116 are configured to selectively connect the strainer 105 and the pipes 104 and 106, or the strainer 105 and the circulation pipe 117. Then, these switching valve mechanisms 115 and 116 are switched to
5 and the circulation pipe 117, the filter 105 and the circulation pipe 117 are configured to form a closed loop pipe. The circulation pipe 117 is filled with a gas such as air or an inert gas. And this circulation pipe 11
7 is provided with an air blower 118, a cooler 119, and a heater 120. And this circulation pipe 1
The gas in the heater 12 is supplied to the heater 12 by a blower 118.
0 and is heated, turned into a high-temperature gas, and supplied into the strainer 105 to evaporate the solvent impregnated in the material in the strainer 105 and dry the material. . The gas that has passed through the filter 105 is cooled by a cooler 119 to condense the solvent vapor contained in the gas, and the condensed solvent is sent into the solvent storage tank 113 by the pump 121. It is configured as follows. In one embodiment of the present invention configured as described above, a solvent is supplied into the washing drum 101, comes into contact with the clothes contained in the washing drum 101, and removes dirt from the clothes. Insoluble/slightly soluble substances suspended in this solvent are collected by a filter 105, and dissolved substances are collected by a distiller 110. The material in the strainer 105 is replaced periodically, but before taking out the used material, the following operation is performed. First, the switching valve mechanism 115,1
16 to connect the filter 105 and the circulation pipe 1.
Connect 17. Then, the blower 118 is operated to send the gas in the circulation pipe 117 to the heater 120 via the cooler 119, and after heating this gas to a high temperature, it is sent into the filter 105. Therefore, the solvent impregnated in the material in the filter 105 is heated by this high temperature gas and evaporated. Then, the gas containing the solvent vapor is sent to the blower 118.
The solvent vapor is sent to a cooler 119 for cooling, and the solvent vapor is condensed and separated. Then, the gas from which the solvent vapor has been separated is heated by the heater 120 and fed into the filter 105 again. Note that the solvent condensed in the cooler 119 is transferred to the pump 12.
1 into the solvent storage tank 113.
The circulation of this gas evaporates the solvent contained in the material in the strainer 105 and dries the material. Once the wood has finished drying, the used wood is removed and replaced with new wood. Therefore, since the used material taken out from the inside of the filtration container 105 has already been dried in the filtration container 105, its amount as radioactive waste is small.
Furthermore, processing becomes easier. Moreover, since the solvent contained in this used material is evaporated and recovered in the filter 105, the solvent is not wasted, and the efficiency of using the solvent is improved. Note that the present invention is not limited to the above-described embodiment. For example, the specific structure of the material drying mechanism is not necessarily limited to the above-mentioned embodiment, but the point is that high-temperature gas is sent into the filter to evaporate and recover the solvent impregnated into the material. Anything that dries the material is fine. As described above, the present invention is provided with a material drying mechanism that allows high-temperature gas to flow through the strainer, evaporates and recovers the solvent impregnated in the material, and dries the material within the strainer. Therefore, the used wood can be dried in the reactor, reducing the amount of removed wood as radioactive waste.
In addition, the treatment becomes easy, and since the solvent impregnated into this material can be evaporated and recovered in the filter, the efficiency of using the solvent is improved, which has great effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional example. FIG. 2 is a schematic diagram of an embodiment of the present invention. 101...Washing drum, 105...Separator,
108...Material drying mechanism, 117...Circulation pipe, 1
18...Blower, 119...Cooler, 120...
Heater.

Claims (1)

[Claims] 1 A washing drum that removes stains by bringing a solvent into contact with radioactively contaminated clothing; a filter that separates and collects insoluble and poorly soluble substances contained in the solvent discharged from this washing drum; a switching valve mechanism provided on the upstream and downstream sides of the filter, a circulation pipe connected to the filter via the switching valve mechanism and containing gas therein, and a heater for heating the gas in the circulation pipe. , a blower that blows the gas heated by the heater into the sieve, a cooler that cools the gas that has passed through the sieve, and a solvent storage tank that collects the solvent condensed in the cooler. A washing device for radioactively contaminated clothing, characterized by comprising: