Method for cleaning alkali metal residues and application thereof

An alkali metal and residual technology, applied in the directions of cleaning methods and utensils, chemical instruments and methods, and process efficiency improvement, can solve problems such as alkali metal residues and safety hazards, avoid sodium-water reaction, improve safety, and reduce consumption. short time effect

Active Publication Date: 2021-06-04
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the serious potential safety hazards and other defects in the existing cleaning process for dealing with sodium residues, and provide a method for cleaning alkali metal residues and its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1

[0073] (1) Prepare dry ice: it consists of 25% by weight of Grade A dry ice, 25% by weight of Grade B dry ice and 50% by weight of Grade C dry ice.

[0074] (2) Alternately inject the first dry air flow and the second dry air flow into the pipeline, the carrier is nitrogen, the single injection time is 7s, and the interval is 3s;

[0075] The ice production speed is 0.06kg / s, and the carrier gas pressure is 0.78MPa;

[0076] The cleaned sodium and other impurities are blown out at the outlet and collected (sodium is mainly in the form of sodium carbonate), and the sodium content on the tube wall is detected by the detection head. When the sodium is cleaned, a total of 35 injections have been performed , the total amount of dry ice used is 14.5kg, and it takes 5min50s.

Embodiment A2

[0078] (1) Prepare dry ice: it is composed of 20% by weight of grade A dry ice, 25% by weight of grade B dry ice and 55% by weight of grade C dry ice.

[0079] (2) Alternately inject the first dry air flow and the second dry air flow into the pipeline, the carrier is nitrogen, the single injection time is 6s, and the interval is 4s;

[0080] The ice production speed is 0.05kg / s, and the carrier gas pressure is 0.65MPa;

[0081] When the sodium is cleaned, a total of 52 sprays are required, the total amount of dry ice is 15.5kg, and it takes 8min50s.

Embodiment A3

[0083] (1) Prepare dry ice: it is composed of 30% by weight of A-grade dry ice, 30% by weight of B-grade dry ice and 40% by weight of C-grade dry ice.

[0084] (2) Alternately inject the first dry air flow and the second dry air flow into the pipeline, the carrier is nitrogen, the single injection time is 8s, and the interval is 2s;

[0085] The ice production speed is 0.042kg / s, and the carrier gas pressure is 0.52MPa;

[0086] When the sodium is cleaned, a total of 50 sprays are required, the total amount of dry ice is 16.6kg, and it takes 8min15s.

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PUM

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Abstract

The invention relates to the field of industrial cleaning and particularly relates to a method for cleaning alkali metal residues and application thereof. The method comprises the following steps: enabling dry airflow to be in contact with a surface to which alkali metal is attached, and enabling the alkali metal to fall off from the surface. The dry airflow comprises carrier gas and a solid cleaning medium; the cleaning medium comprises dry ice; and the content of the dry ice is greater than 90wt% based on the total weight of the cleaning medium. According to the method, dry cleaning can be achieved; sodium-water reaction is avoided; the safety is greatly improved; residual sodium and other dirt can be quickly and effectively removed; almost no residue is left after cleaning; no secondary pollution is caused; cleanness and environmental protection are achieved; corrosion and damage to the cleaned surface can be reduced; and the service life of the product is prolonged.

Description

technical field [0001] The invention relates to the field of industrial cleaning, in particular to a method for cleaning alkali metal residues and an application thereof. Background technique [0002] Nuclear power is of great significance for solving energy shortages and coping with environmental degradation and climate warming. The sodium-cooled fast reactor technology has become a key reactor type for its inherent safety and high economy. As a heat transfer medium and coolant, sodium metal has high chemical activity and can burn in oxygen, chlorine, fluorine, and bromine vapors; when it encounters water or water vapor, it reacts violently to release hydrogen gas, which releases a large amount of heat and causes combustion or explosion; It can burn by itself in the air, and explode to make the melt splash; it can react violently with halogens, phosphorus, many oxides, oxidants and acids. [0003] At present, there are six methods used in cleaning sodium-cooled fast react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B7/00B08B13/00
CPCB08B7/00B08B13/00Y02P10/20
Inventor 曹留烜缪惠芳郑剑香张尧立洪钢赵英汝董士刚
Owner XIAMEN UNIV
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