Radioactive methyl iodide trapping pretreatment device

Abstract

A brand new technical route is adopted, at the front end of an alkali washing unit, radioactive methyl iodide airflow enters a box body from an air inlet, passes through a flow equalizing plate and then uniformly enters each catalytic reaction tube, and under the action of an ultraviolet lamp, the radioactive methyl iodide airflow flows into the box body and then flows into the catalytic reaction tubes; methyl iodide is quickly and thoroughly decomposed into organic matters on the surface of the photocatalyst, and the alkali washing unit can effectively capture elemental iodine, so that the iodine capture efficiency of the rear-end alkali washing unit is greatly improved, the waste yield in the alkali washing process is reduced, protection optimization is realized, and the dependence on the existing negative silver solid adsorbent is greatly reduced; the post-treatment cost is reduced, and the post-treatment efficiency is improved. The radioactive methyl iodide trapping pretreatment device has the advantages of being high in methyl iodide decomposition treatment efficiency, free of secondary waste, compact in structure, simple, easy to maintain, capable of meeting the requirements for trapping pretreatment of radioactive methyl iodide airflow with different concentrations and different air volumes through flexible modification, high in applicability and high in safety.

Description

technical field [0001] The invention belongs to the field of radioactive fuel post-processing, in particular to a radioactive methyl iodide capture and pretreatment device. Background technique [0002] The current spent fuel reprocessing pilot plants in operation usually use the PUREX process for spent fuel reprocessing. The spent fuel reprocessing process mainly includes key processes such as head end, chemical separation, and uranium and plutonium tail end. A large amount of radioactive exhaust gas will be generated during the reprocessing process, mainly including 129 Class I gas fission products and radioactive fission product aerosols (solid particles and tiny droplets of gas containing radioactive fission products), in order to minimize the impact of gas fission products or aerosol fission products on the environment and public health, are The fission products need to be purified before they can be discharged. Radioactive iodine is one of the main fission products i...

AI Technical Summary

Problems solved by technology

Therefore, in order to ensure the purification effect on methyl iodide, the alkali washing process usually needs to be used in conjunction with negative silver solid adsorbents. The existing negative silver solid adsorbents generally have the problem of low silver utilization, resulting in higher comprehensive treatment costs, and A large amount of waste is generated, and other new solid adsorbents under research are not ready for industrial application

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