Harmless treatment method of polycyclic aromatic hydrocarbon in transformer insulating oil

A technology of transformer insulating oil and harmless treatment, which is applied in the protection device against harmful chemicals, etc., can solve problems such as shortage, oil products flowing into society, endangering human health and ecological safety, and achieve the effect of eliminating potential hazards

Active Publication Date: 2012-11-28
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the lack of related technologies and measures, the current scrapped transformer insulating oil mainly flows into waste oil recycling companies and other institutions in the society through the sale and disposal of waste materials. It is mixed with ordinary lubricating oil and processed as low-grade industrial lubricating oil.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] In this embodiment, the insulating oil of a transformer operating in a 220kV substation is taken as an example.

[0023] A method for harmless treatment of polycyclic aromatic hydrocarbons in transformer insulating oil, comprising the following steps:

[0024] (1) Filtration of scrapped transformer insulating oil and sludge: Take 30L of scrapped insulating oil from a 220kV substation and remove the sludge by pressure mechanical filtration at 80°C and 0.5MPa. After 15 cycles of filtration, there is no viscous asphaltene in the oil , the sludge has been completely filtered.

[0025] (2) Determination of the content of polycyclic aromatic hydrocarbons in the insulating oil of scrapped transformers: the concentration of polycyclic aromatic hydrocarbons in the oil was measured to be 8.3 × 10 -6 mol / L, the specific steps are: use a pipette to accurately pipette 5ml of returned and scrapped insulating oil into a 25ml volumetric flask, dilute to the mark with cyclohexane, shak...

Embodiment 2

[0030] Referring to Example 1, the difference is that: in step (1), the oil sludge is circulated and filtered for 10 times at 60°C and 1.2 MPa and then completely filtered; in step (2), the polycyclic The concentration of aromatics is 7.7×10 -5 mol / L; the photocatalyst cured in step (3) is Cu 2+ Doped nano-scale titanium dioxide, the reaction precursor is tetraethyl titanate, 1000mL 3mol / L Cu (NO 3 ) 2 solution, the solid matrix used for immobilization is silica gel, the mixing ratio of sol and silica gel is 1:3 wt / wt, and calcined at 700°C for 3h to obtain immobilized doped Cu 2+ (1.8wt%) nano-titanium dioxide powder, the size of the doped nano-titanium dioxide is 20nm; the average temperature of the degradation reaction in step (4) is 50°C, the reaction time is 19h, and the degradation rate reaches 97%.

Embodiment 3

[0032] Referring to Example 1, the difference is: in step (1), the oil sludge is circulated and filtered for 9 times at 55°C and 0.7 MPa and then completely filtered; in step (2), the polycyclic aromatic hydrocarbons in the scrapped transformer insulating oil are measured The concentration is 1.8×10 -7 mol / L; the photocatalyst cured in step (3) is Ru 3+ Doped nano-scale titanium dioxide, the reaction precursor is tetrapropyl titanate, 1000mL 6mol / L RuCl 3 solution, the solid matrix used for immobilization is glass beads, the mixing ratio of sol and glass beads is 1:6 wt / wt, and calcined at 650°C for 1.5h to obtain immobilized doped Ru 3+ (6.8wt%) nano-titanium dioxide powder, the size of the doped nano-titanium dioxide is 9nm; the average temperature of the degradation reaction in step (4) is 35°C, the reaction time is 11h, and the degradation rate reaches 98%.

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Abstract

The invention belongs to the technical field of harmless treatment of transformer insulating oil, and particularly discloses a harmless treatment method of polycyclic aromatic hydrocarbons in transformer insulating oil. The method comprises the following steps: (1) filtering transformer insulating oil, removing oil sludge, wherein a sign for determining thorough filtration of the oil sludge is that viscous asphaltene in the transformer insulating oil disappears thoroughly; (2) determining the content of polycyclic aromatic hydrocarbons in the transformer insulating oil; (3) preparing an immobilized nanometer titanium dioxide photocatalyst, then spreading the immobilized nanometer titanium dioxide photocatalyst on a photochemical reactor with sunlight flat configuration; (4) performing photocatalytic degradation of the polycyclic aromatic hydrocarbons in the transformer insulating oil. According to the invention, harmless treatment of discarded transformer insulating oil is performed, and potential harm to human health and ecological environment caused by polycyclic aromatic hydrocarbons in the oil is eliminated.

Description

technical field [0001] The invention belongs to the technical field of harmless treatment of transformer insulating oil, and in particular relates to a method for harmless treatment of polycyclic aromatic hydrocarbons in transformer insulating oil. Background technique [0002] Transformer insulating oil is the most important insulating and cooling medium for oil-filled power equipment. Due to natural deterioration of oil products or equipment modification and scrapping, a certain amount of waste transformer insulating oil will be produced every year. With the rapid development of power grid construction and the upgrading of new power equipment, the amount of scrapped transformer insulating oil is also increasing. At present, the commonly used petroleum-based transformer insulating oil is an organic pollutant that is difficult to degrade in the environment, and a considerable part of the transformer insulating oil contains a certain amount of polycyclic aromatic hydrocarbons...

Claims

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Application Information

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IPC IPC(8): A62D3/17A62D101/20
Inventor 赵光金吴文龙朱莉娜杨东凯
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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