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

A carbon dioxide and chemical decontamination technology, which is applied to chemical instruments and methods, cleaning methods and appliances, etc., can solve the problems of easily damaged equipment surfaces, high risk of personnel being exposed to radiation, and harsh insulation conditions, so as to reduce waste water treatment and discharge, Good accessibility and less secondary pollution

Pending Publication Date: 2021-06-18
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The radioactive contamination supercritical carbon dioxide chemical decontamination method of the present invention comprises the following steps: 1) putting the component containing radioactive contamination into the decontamination chamber; 2) carbon dioxide enters the gas storage tank from the standard gas cylinder, and the refrigeration device refrigerates the gas storage tank , keep the carbon dioxide in a liquid or gas-liquid two-phase state; 3) The carbon dioxide in the gas storage tank is pressurized into the mixer through the booster pump, and the detergent enters the detergent adding pump from the detergent container and enters the mixer under pressure , the mixed fluid of carbon dioxide and detergent in the mixer enters the preheater for pre-heating, and then enters the decontamination chamber container to make the decontamination chamber reach the set pressure of 50 MPa, and at the same time start the constant temperature heating device installed outside the de...

Embodiment 2

[0039] like figure 1 Shown, radioactive pollution supercritical carbon dioxide chemical decontamination device of the present invention, decontamination device is made up of gas storage tank, booster pump, mixer, preheater, decontamination chamber, separation chamber, filter, decontamination agent carrying agent Pumps, detergent containers, refrigeration devices, constant temperature heating devices, waste collectors, metering pumps, valves, pipelines, instruments, safety devices and control systems.

[0040] like figure 2 As shown, the decontamination chamber is fixed by the sealing cover 1, the decontamination container cylinder 2, the water jacket 3, the decontamination container inlet pipe 4, the side insulation layer 5, the heating pipe 6, the bottom insulation layer 7, the outlet pipe 8, and the bottom plate Bolt 9, side temperature sensor 10, sealing cover pressing bolt 11, O-ring 12, gasket 13, top temperature sensor 14, cover screw 15, etc. A constant temperature a...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B7/00
CPCB08B7/0021
Inventor 孙志军章航洲王帅张永领刘琢艺滕磊隆涛文静刘金龙彭婧张莹刘晓琼
Owner NUCLEAR POWER INSTITUTE OF CHINA
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