Microwave-based drying device and drying method for treating reactor core waste water

Abstract

The invention relates to a microwave-based drying device and a drying method for treating reactor core waste water, belonging to the technical field of reactor core waste water treatment during nuclear power operation. The drying device comprises a drying area and a microwave feeding area, the drying area is used for containing reactor core waste water to be treated; microwaves are fed from the side surface of the microwave feeding area and irradiate the liquid level of the reactor core waste water; non-contact heating is carried out on the reactor core waste water. Meanwhile, a vapor outlet is arranged above the microwave feeding area for discharging water vapor. According to the invention, water in the reactor core waste water is discharged in an evaporation mode; meanwhile, NaNO3 in thereactor core waste water is solidified, and the solidified NaNO3 is greatly smaller than the volume of the original reactor core waste water, so that drying, volume reduction and solidification of the reactor core waste water are realized. The reactor core waste water is continuously supplemented through a fluid supplement port, so that multiple barrels of reactor core waste water can be concentrated in one drying barrel, centralized treatment is realized, curing treatment is not required, and the reactor core waste water can be directly fed into a disposal field.

Description

technical field [0001] The invention belongs to the technical field of reactor core wastewater treatment during nuclear power operation, and in particular relates to a microwave-based drying device and drying method for reactor core wastewater treatment. Background technique [0002] In nuclear power units, the cooling water of the core is deionized water, and the irradiation of the reactor makes the cooling water continuously become a strong acid or strong alkali solution containing radioactive substances (such as Cs, Co, Sr, etc.), due to strong acid or strong alkali For the corrosion of pipelines, these solutions are continuously removed, and neutralized with nitric acid or NaOH to form sodium nitrate solution (ie, nuclear power core wastewater), so that nuclear power units continue to produce nuclear power core wastewater (ie, NaNO containing radioactive substances) 3 solution), the conventional treatment of this radioactive core wastewater is cement solidification. [...

AI Technical Summary

Problems solved by technology

However, the solidification of cement increases the capacity relatively, which is neither in line with the principle of minimizing radioactive waste, but also increases the disposal cost. For example, the nuclear power core wastewater of a 100kW unit is 1,000 tons per year, and the core wastewater is packed in 200 kg barrels. , there are 5,000 barrels of nuclear power core wastewater, due to the capacity increase factor of cement solidification (1 barrel becomes 2 barrels), this will produce 10,000 barrels of cement solidified body, which greatly increases the disposal cost

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