A method for cleaning the filter tube of hydrofluorination fluidized bed in uranium conversion

Abstract

A method for cleaning a filter tube of a hydrofluorination fluidized bed in uranium conversion, comprising the following steps: (1) removing surface dirt; (2) removing internal dirt; (3) passivating and drying. The advantage of the present invention is that the chemical agent is prepared for the cleaning of the clogged filter pipe of the hydrofluorination fluidized bed. It can effectively remove the dirt inside the filter tube. In the present invention, after the dirt on the surface of the filter tube is washed, the dirt inside the filter tube is further removed by soaking and bubbling with chemicals. After cleaning the dirt inside the filter tube, use the passivation and drying scheme to ensure the anti-corrosion performance of the filter tube. The filter tubes cleaned by the cleaning process can meet the requirements of the hydrofluorination fluidized bed process, achieve the purpose of reuse, have certain economic benefits, and reduce production costs.

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