A high-level waste liquid vitrification system and its curing method

Abstract

The invention discloses a highly radioactive waste liquid glass curing system and a method thereof. Highly radioactive waste liquid is metered,afterwards isdelivered into a reaction kettle, evaporatedand dried in the reaction kettle through negative pressure and then iscalcinatedthrough high temperature, waste gas output by the reaction kettle is cooled and absorbed through a two-level cooling tower, afterwards enters a denitrating tower to be subjected to denitrating treatment andis thenexhausted, then the reaction kettle is transferred to a stirring station through a reaction kettle drivingmechanism, cleaning water is added, the slurry is stirred through a stirring device, then the reaction kettle is transferred to a feed mixing station, the slurry in the reaction kettle is transferredinto a feed mixing machine through a compression air feed transferring device, a glass former is added to mix the slurry, then the slurry in the feed mixing machine is transferred to a feed loading machine through the compression air feed transferring device again, the slurry in the feed loading machine is pushed into a feed bucket through compression air, and finally the feed bucket is pushed into a glass curing furnace to be cured under heating. The highly radioactive waste liquid glass curing system has the advantages that the equipment is long in service life, the reliability is high, thetreatment process is safe and controllable, and remote control and automated operation can be achieved.

Description

technical field [0001] The invention belongs to the technical field of spent fuel treatment produced in the nuclear industry. It specifically relates to a vitrification treatment system and process method for a large amount of high-level radioactive waste liquid generated in the process of spent fuel reprocessing. Background technique [0002] According to authoritative experts in the field of nuclear energy, China will pay more attention to the development of nuclear power in the future, and China's nuclear power construction will enter a new era. According to relevant plans, by 2020 my country's operating nuclear power and nuclear power under construction will reach a scale of 88 million kilowatts, and the cumulative amount of spent fuel in nuclear power plants will be more than 7,000 tons, and by 2025 the accumulated amount will be more than 14,000 tons. Spent fuel is a precious resource, which also contains many useful unfissioned and newly formed nuclides such as U-235...

AI Technical Summary

Problems solved by technology

The advantage of the tank melting process is that the process is simple and the process is easy to control. The disadvantage is that the life of the melting furnace is short (melting 25-30 batches of glass, the furnace body must be replaced), and the diffusion of radioactive substances causes a large amount of decontamination waste liquid. At present, this Craft has been eliminated

③ The cold crucible melting technology of high-level radioactive waste liquid is a so-called advanced vitrification treatment technology developed in recent years. The disadvantage is that the energy consumption is very high, the efficiency is very low, and the disadvantages such as the spread of radioactive dust cannot be completely avoided.

[0005] It can be seen that the above methods all have some fatal shortcomings.

The short life means that it is often necessary to dismantle scrapped and radioactively contaminated smelting furnaces, and generate a large amount of additional radioactive waste with high disposal costs; the above-mentioned processes have open or semi-open operations to varying degrees, radioactive dust and other harmful chemical gases Severe diffusion will lead to defects such as equipment corrosion or large amount of secondary waste liquid due to decontamination of facilities / sites, and short life of melting furnaces; the diffusion of radioactive dust will also lead to high difficulty in radiation protection during equipment repair and maintenance, and high radiation risks for maintenance workers , must be decontaminated before maintenance, such as the aforementioned about 3600m per year 3 Ground decontamination liquid, the curing process involves the operation of a large amount of highly corrosive high-level waste liquid, the diffusion of a large amount of harmful acid and nitrogen oxide gas leads to serious corrosion in the entire process of waste liquid curing treatment, short life of curing furnace and other facilities, and the life of the curing system Short leads to high curing cost

Mixing high-level radioactive waste water with glass components, and then vitrifying directly in the melting furnace, this process seems to simplify the process on the surface, but there are disadvantages such as greater risk of radioactive material diffusion and difficulty in equipment maintenance.

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