Method for cleaning filtering tube of hydrofluorination fluidized bed in uranium conversion

Abstract

A method for cleaning the filtering tube of a hydrofluorination fluidized bed in uranium conversion comprises the following steps: (1) removal of surface dirt; (2) removal of internal dirt; and (3) passivation and drying. A chemical medicament is prepared for cleaning of the blocked filtering tube of the hydrofluorination fluidized bed. the dirt inside the filtering tube can be effectively removed. The dirt in the filtering tube is further removed through chemical medicament immersion, bubbling and other processes after the dirt on the surface of the filtering tube is washed out. The passivating and drying process is used after the removal of the dirt in the filtering tube in order to ensure the anticorrosion performance of the filtering tube. The filtering tube cleaned with the cleaning method can meet the process requirements of the hydrofluorination fluidized bed to achieve the purpose of repeated use, has certain economic benefits, and reduces the production cost.

Description

technical field [0001] The invention belongs to a tail gas filter device in uranium conversion, in particular to a cleaning device for clogged tail gas filter device of hydrofluorination fluidized bed in uranium conversion. Background technique [0002] During the use of hydrofluorinated fluidized bed filter tubes, unconverted or incompletely converted UO2 particles continue to react with HF in the filter tube wall pores to form UF4, resulting in volume expansion of solid particles and blockage of channels. As the running time prolongs, this internal blockage will gradually increase. At this time, the filter tube needs to be replaced, and the replaced filter tube needs to be cleaned for reuse. [0003] In the chemical industry, the cleaning methods for filter tubes mainly include chemical cleaning, high-pressure water cleaning and PIG pigging. Chemical cleaning is to clean the parts to be cleaned by adding chemicals; high-pressure water cleaning is to clean through the move...

AI Technical Summary

Problems solved by technology

[0005] High-pressure water cleaning can wash away the dirt on the surface of the filter tube, but the clogging of the filter tube of the hydrofluoric fluidized bed is caused by the internal blockage of the filter tube, and the filter tube is mostly a multi-layer mesh-covered superimposed structure or a metal sintered structure, and the water pressure may be too high The filter tube is damaged, the water pressure is too low to remove the dirt

[0006] PIG cleaning can only remove the dirt on the surface of the filter tube, but cannot remove the dirt inside the filter tube, and the purpose of cleaning cannot be achieved