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. 2020 Mar 27;6(3):e03643.
doi: 10.1016/j.heliyon.2020.e03643. eCollection 2020 Mar.

Pretreatment of Fuller's Earth With Nitrogen

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Free PMC article

Pretreatment of Fuller's Earth With Nitrogen

Janvier Sylvestre N'cho et al. Heliyon. .
Free PMC article

Abstract

This paper summarizes experimental findings of the regenerative capability of nitrogen on Fuller's earth. Regenerating new oil from aged oil involves several cycles requiring a large volume of Fuller's earth. The use of large amounts of Fuller's earth is not economically profitable for companies that carry out regenerative operations to service transformer oils and can have environmental implications, since Fuller's earth is usually used to reclaim transformer oil in a one-time batch basis then disposed of. To improve the situation, a new technique to reduce the number of regeneration cycles is proposed. It is shown that Fuller's earth can be improved by purging it with continuous flowing of a fluid, preferably dry nitrogen.

Keywords: Dielectrics materials; Earth sciences; Electrical insulation; Environmental science; Geochemistry; High voltage engineering; Petroleum engineering; Power transformer.

Figures

Figure 1
Figure 1
Fuller's earth grounded to fine powder.
Figure 2
Figure 2
Degradation processes for transformer insulation.
Figure 3
Figure 3
Sketch of the experimental procedure.
Figure 4
Figure 4
DDP and turbidity values obtained with Normal Fuller's earth during the three cycles of reclamation.
Figure 5
Figure 5
DDP and turbidity values obtained with Improved Fuller's earth during the three cycles of reclamation.
Figure 6
Figure 6
Reclamation rate achieved by both Fuller's earth types during each cycle of reclamation.
Figure 7
Figure 7
Reproducibility test of the two Fuller's earth types. DDP: Dissolved Decay Products.
Figure 8
Figure 8
Reclamation rate after reproducibility test.

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References

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