Scavenging agent used for transformer iron core insulating varnish, and scavenging method

Abstract

The invention belongs to the technical field of transformer iron core recovery, and especially relates to a scavenging agent used for transformer iron core insulating varnish, and a scavenging method.The scavenging agent is mainly prepared from trichloroethane, hexane, tetrachloroethylene, and trichloromethane. The scavenging method comprises following steps: a transformer iron core is immersed in the scavenging agent; after immersion, the transformer iron core is subjected to washing and drying so as to obtain the transformer iron core without insulating varnish. The scavenging agent is prepared from trichloroethane, hexane, tetrachloroethylene, and trichloromethane through mixing, the scavenging agent molecules obtained through mixing are capable of entering insulating vanish coating gaps, realizing full swelling of the insulating varnish on the iron core surfaces, realizing precipitation of the insulating varnish coating layers from the iron core laminated sheet surfaces, sheddingof the insulating varnish in the form of loose powder, and cleaning of the insulating varnish from the transformer iron core laminated sheet surfaces. The scavenging agent is prepared from the specific solvents through combination, is excellent in swelling performance, and is capable of eliminating insulating varnish on iron core laminated sheet surfaces completely.

Description

technical field [0001] The invention relates to the technical field of transformer iron core recycling, in particular to a scavenger and a scavenging method for transformer iron core insulating varnish. Background technique [0002] The iron core is the main magnetic circuit part of the transformer. It is usually made of silicon steel sheets or amorphous strips. In order to reduce the loss of the iron core, the surface of the iron core laminates is coated with insulating varnish. Insulation coating not only provides very important interlayer insulation, but also as a metal surface coating also shoulders the task of providing materials with properties such as corrosion resistance, oil corrosion resistance and solvent corrosion resistance. [0003] Due to the wide range of transformer applications and the huge number of transformer applications, more and more iron core components are scrapped due to the end of normal service life. How to recycle these iron core materials has a...

AI Technical Summary

Problems solved by technology

When the iron core is recycled, the insulating varnish on the iron core has a strong adhesion to the substrate, and it is difficult to remove it effectively with general cleaning fluids

If the insulating varnish on the iron core is not cleaned before returning to the furnace, a large amount of harmful gas will be produced during the smelting process, which will pollute the environment. Secondly, the composition of the iron core material is strictly controlled, and the insulating varnish is transformed into impurities during the smelting process. It increases the difficulty of recycling and smelting, which is not conducive to controlling the performance of the returned materials

[0004] Therefore, the insulating varnish on the waste iron core has caused certain limitations to its recycling

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