A spent fuel short-stage oxidation device and method thereof

Abstract

The invention belongs to the technical field of the after-treatment of spent fuels and particularly relates to an oxidation device and method for a spent fuel short section. The device comprises a sealed furnace body, a sealed protecting cover, a cylindrical oxidation reactor, a feeding pipe, a reaction gas air inlet pipe, a powder receiver and a covered shell discharging pipe, wherein the sealedbody can be heated; the sealed protecting cover is arranged in an inner cavity of the furnace body, the cylindrical oxidation reactor is arranged in the protecting cover through a transmission shaft,the transmission shaft is arranged along a central shaft of the oxidation reactor and can drive the oxidation reactor to rotate, and spiral blades are arranged at the transmission shaft in the oxidation reactor; a plurality of through holes are uniformly formed in the cylinder wall of the oxidation reactor; the tail end of the feeding pipe is communicated with the top end of the oxidation reactor,and the top end of the feeding pipe is arranged outside the upper side of the furnace body in series; the top end of the reaction gas inlet pipe is communicated with the protecting cover, and the tail end of the reaction gas inlet pipe is arranged outside the furnace body in series; the powder receiver is located below the oxidation reactor, and a powder outlet of the powder receiver extends outof the lower part of the furnace body; and the top end of the covered shell discharging pipe is communicated with the tail end of the oxidation reactor, and the tail end of the covered shell discharging pipe penetrates out of the lower part of the furnace body.

Description

technical field [0001] The invention belongs to the technical field of spent fuel reprocessing, and in particular relates to a spent fuel short-stage oxidation device and a method thereof. Background technique [0002] Spent fuel reprocessing is an important way to achieve proper management of nuclear power plant spent fuel reprocessing. At present, most of the tritium produced by reactor fission is released during the spent fuel reprocessing process. For a traditional reprocessing plant, the entire process will produce about 100 m3 of heavy metal per ton. 3 tritium-containing wastewater. However, since the oxidized forms of tritium (HTO, DTO and T2O) can directly participate in the circulation of body fluids, their radiotoxicity is 10,000 times stronger than that of elemental gas tritium (HT, DT and T2). Therefore, from the perspective of safety and environmental protection, it becomes very necessary to realize the centralized management of tritium. The current general p...

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Problems solved by technology

At present, the reported spent fuel oxidation devices are generally operated in batch mode, which has the disadvantages of complex structure, slow processing speed, low processing capacity, and the inability to effectively separate the U3O8 powder obtained after oxidation from the cladding.

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