A uf6 hydrolysis column, hydrolysis system and hydrolysis process

Abstract

The invention relates to a UF6 hydrolysis column, a hydrolysis system and hydrolysis process. According to the invention, the top part of the UF6 hydrolysis column is provided with a water inlet (3), an air outlet (5) and a cyclic hydrolysate inlet (4); the bottom part of the UF6 hydrolysis column is provided with a hydrolysate outlet (12); the middle part of the UF6 hydrolysis column is provided with an air inlet pipe (8) which extends into the interior of a hydrolysis column shell (1); the air inlet pipe (8) is provided with an electric heat tracing mechanism (16); the end part of the air inlet pipe (8) extending into the hydrolysis column shell (1) is connected with a spray nozzle (7) which is equipped with a heat-preservation mechanism; and a hydrolysate outlet pipeline (13) connected with the hydrolysate outlet (12) is connected with a hydrolysate cyclic bypass (14) which is connected with the cyclic hydrolysate inlet (4). The UF6 hydrolysis column provided by the invention can guarantee the concentration of the hydrolysate therein, has uniform temperature; meanwhile, UO2F2 crystals located at the spray nozzle can be prevented from occurrence, and stability and safety are high; and the hydrolysis system and the hydrolysis process can realize continuous hydrolysis of UF6, and complete hydrolysis is guaranteed.

Description

Technical field [0001] The invention belongs to the technical field of gasification and hydrolysis technology in the chemical conversion process of a nuclear fuel element production line, and specifically relates to a UF 6 Hydrolysis column, hydrolysis system and hydrolysis process. Background technique [0002] In the production of nuclear fuel elements in my country, UF 6 Preparation of ceramic UO for wet conversion of raw materials 2 For powders or particles, it is necessary to first vaporize the uranium hexafluoride in a solid state at room temperature into a gas, then react with water to form an aqueous uranyl fluoride solution (gasification and hydrolysis process), and then undergo precipitation and solid-liquid separation to obtain ADU slurry Body, continue to be dried and calcined to obtain U 3 O 8 Powder, and finally through sol-gel, washing and drying, reduction and sintering processes, a qualified ceramic UO is obtained 2 Core particles. [0003] UF 6 It is a strong oxid...

AI Technical Summary

Problems solved by technology

It is found from the many years of production and operation practice of domestic nuclear fuel element plants that the traditional UF 6 There are deficiencies in the design of the hydrolysis device, and the concentration and temperature of the hydrolyzate in the entire column are not uniform. At the same time, the UF 6 The inlet of the gasification nozzle is often prone to UO due to severe hydrolysis reaction 2 f 2 Crystallization blockage, thus affecting the safety of the hydrolysis column in the gasification hydrolysis process and the continuous stability of equipment operation

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