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Radioactive waste drying method and system

A radioactive waste and drying method technology, which is applied in the direction of radioactive purification, drying solid materials, and method combination to dry solid materials, etc., can solve the problems of hindering water evaporation, long time, migration, etc., and achieve the effect of improving drying efficiency

Inactive Publication Date: 2019-01-18
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direction of water transfer in traditional hot air drying is opposite to the direction of heat transfer, and long-term hot air drying will cause the surface layer of waste to harden, further hindering the evaporation of water. Therefore, the disadvantages of using traditional hot air drying methods are: too long time, energy consumption The advantage of microwave heating and drying of solid radioactive waste is that the direction of moisture escape is the same as the direction of heat transfer, the time required for drying is very short, and the total energy consumption required is low. Therefore, excessive local temperature may lead to carbonization, combustion and even nuclide migration of waste, resulting in unpredictable risks

Method used

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Embodiment 1

[0039] The flow chart of the drying method of radioactive waste in the embodiment of the present invention is as follows figure 1 shown, including the following steps:

[0040] S1 hot air drying device and microwave drying device simultaneously dry radioactive waste.

[0041] It should be noted that before the drying treatment, it is necessary to detect the moisture content of the radioactive waste through a moisture monitoring device to obtain the total water content data of the radioactive waste.

[0042] Randomly pre-dry a small amount of waste (about 1 / 10 of the total waste) to estimate the total water content of radioactive waste. Assuming that about 50 barrels of wet radioactive waste are produced in a certain inspection, 3-5 barrels of waste can be extracted for conventional drying such as hot air drying, and the quality change of the waste before and after drying can be detected, and the remaining radioactive waste of the same batch can be estimated based on this moi...

Embodiment 2

[0054] figure 2 A schematic structural diagram of a drying system for radioactive waste is disclosed, including a drying device, a moisture monitoring device and a PID (proportional, integral, differential) controller;

[0055] The drying device includes a hot air drying device and a microwave drying device for drying the radioactive waste. The hot air drying device includes a fan and an air heater. The microwave drying device includes: a wave source, a magnetron, a drying chamber and a microwave shielding net. The moisture monitoring device includes a moisture filter, a communication device and an exhaust gas collection device.

[0056] The drying process of the drying system of the radioactive waste is:

[0057] Screen the solid radioactive waste, remove the metal radioactive waste, and detect the moisture content of the radioactive waste through the moisture monitoring device to obtain the total water content data of the radioactive waste.

[0058] Spread a small amount ...

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Abstract

The invention provides a radioactive waste drying method and system. Radioactive wastes are dried by using a hot air drying device and a microwave drying device, the water content of the radioactive wastes is monitored in real time, when the water content is lower than a certain range threshold, the microwave drying device is shut down, the hot air drying device continues to dry the radioactive wastes, when the drying degree of the radioactive wastes meets certain requirements, drying is finished, and the hot air drying device is shut down. By means of the method, two different drying ways aremutually combined, the time required for drying is shortened, energy consumption is reduced, and the disposal risk caused when the local temperature is overhigh in the drying process can be avoided.

Description

technical field [0001] The invention relates to the technical field of radioactive waste treatment, in particular to a radioactive waste drying method and system. Background technique [0002] The low-solid radioactive waste generated by the operation of nuclear power plants is mainly water-containing technical radioactive waste such as plastic cloth, absorbent paper, and textiles produced by system maintenance. At present, the treatment methods adopted by my country's nuclear power plants for radioactive waste are mostly drying and then curing or compression. In GB 12711-91 "Safety Standards for Low and Medium Level Solid Radioactive Waste Packaging", there are strict requirements on the water content of radioactive waste packages, requiring that the weight of free liquid in the container should be less than 1% of the weight of solid radioactive waste. [0003] The drying process of low-solid radioactive waste generated by the operation of nuclear power plants is mainly tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B7/00F26B25/22G21F9/30
CPCF26B7/00F26B25/22G21F9/30
Inventor 陈梅倩张红帅付毕安
Owner BEIJING JIAOTONG UNIV
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