Microwave Drying Device for Radioactive Wet Waste
Nuclear power plants will generate a large amount of wet waste during operation, including sludge, concentrated liquids, spent resins, and wet technical wastes. Currently, the cement solidification method is widely used, which leads to volume increase, and brings issues with the stability of waste properties. Microwave drying technology (operated in a drum) achieves “liquid-to-solid” transformation of wet wastes, improving waste safety while reducing volume. It is also suitable for handling complex liquid waste and other solid wet wastes during the decommissioning phase of nuclear facilities.
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Microwave drying technology utilizes high-frequency electromagnetic waves to instantly penetrate the heated materials and transfer energy to the heated materials. It effectively avoids the temperature gradient from the wall to the center of the drum and the problem of material transformation associated with conventional heat sources such as steam, electric heating, or heat conduction oil. Furthermore, it has strong penetration ability and volumetric heating advantages, ensuring uniform evaporation of the materials and effectively preventing the carryover of nuclides with the evaporating moisture. The selective heating and low thermal inertia of microwaves also help control the escape of other nuclides from waste. The compact size of microwave equipment allows it to be designed as a modular structure to suit different application needs. It can also be made into a mobile treatment equipment, avoiding excessive burden on enterprises and the environment.
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