Radioactive pollution supercritical carbon dioxide chemical decontamination method and decontamination device thereof

Abstract

The invention discloses a radioactive pollution supercritical carbon dioxide chemical decontamination method and a decontamination device thereof. The decontamination device comprises a gas storage tank, a booster pump, a mixer, a preheater, a decontamination chamber, a separation chamber, a filter, a detergent carrying pump, a detergent container, a refrigerating device, a constant-temperature heating device, a waste collector, a metering pump, a valve, a pipeline, an instrument, a safety device and a control system. According to the radioactive pollution supercritical carbon dioxide chemical decontamination method, the characteristics of diffusivity and dissolving capacity of supercritical carbon dioxide fluid are utilized, the supercritical carbon dioxide fluid is adopted as a solvent to dissolve a chemical detergent, and the decontamination device can be used for decontamination of the inner cavity surface, micro pores and high-precision surfaces of equipment or components and has the advantages of being good in accessibility, small in damage, capable of recycling decontamination media, little in secondary pollution and the like.

Description

technical field [0001] The invention relates to the technical field of decontamination of nuclear facilities and radioactive facilities, in particular to a chemical decontamination method and a decontamination device for radioactive pollution supercritical carbon dioxide. Background technique [0002] Radioactive pollution decontamination refers to the method of removing radioactive substances on the surface of the target object by mechanical, physical or chemical methods. Decontamination plays an important role in the operation, preventive maintenance and decommissioning of nuclear facilities. However, when the traditional method decontaminates the circuit system or components, there are more or less problems such as high labor intensity, high risk of exposure to personnel, and more secondary waste. For example, the pollution of the circuit system is mainly concentrated in the inner walls or cavities of containers, pipes, pumps, valves, etc. It is difficult for the existin...

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Problems solved by technology

However, when the traditional method decontaminates the circuit system or components, there are more or less problems such as high labor intensity, high risk of exposure to personnel, and more secondary waste.

For example, the pollution of the loop system is mainly concentrated in the inner walls or cavities of containers, pipes, pumps, valves, etc. It is difficult for the existing mechanical and physical decontamination methods to reach the contaminated parts for decontamination, and it is easy to damage the surface of the equipment

Commonly used chemical decontamination requires high temperature, harsh insulation conditions, and a large amount of waste water is likely to be generated, resulting in high treatment costs

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