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CN-121991753-A - Method for purifying transformer oil

CN121991753ACN 121991753 ACN121991753 ACN 121991753ACN-121991753-A

Abstract

The invention provides a method for purifying transformer oil, and belongs to the field of maintenance of power equipment. The invention provides a method for purifying transformer oil, which comprises the following steps of introducing the transformer oil into a microporous ceramic filter for filtering to remove solid particles and macromolecular impurities to obtain first purified oil, mixing the first purified oil with a molecular sieve at normal temperature and normal pressure for adsorption to remove moisture, oxygen and partial aging products to obtain second purified oil, mixing the second purified oil with an antioxidant for oxidation reaction to decompose residual aging products to obtain third purified oil, and carrying out centrifugal separation on the third purified oil to obtain the purified transformer oil. Through filtration of a microporous ceramic filter, adsorption of a molecular sieve, oxidation reaction with an antioxidant and centrifugal separation, solid particles, macromolecular impurities, moisture, oxygen and aging products in the transformer oil are removed, so that the purified transformer oil reaches a new oil standard.

Inventors

  • LIN XIANJUN
  • LA YUAN
  • CHENG CHUANHUI
  • CHANG WEI
  • LIU BAIHUI

Assignees

  • 南方电网科学研究院有限责任公司
  • 沈阳仪表科学研究院有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (10)

  1. 1. The method for purifying the transformer oil is characterized by comprising the following steps of: Introducing transformer oil into a microporous ceramic filter for filtering to remove solid particles and macromolecular impurities, thereby obtaining first purified oil; Mixing the first purified oil with a molecular sieve at normal temperature and normal pressure for adsorption, and removing moisture, oxygen and partial aging products to obtain second purified oil; mixing the second purified oil with an antioxidant for oxidation reaction, and decomposing the residual aging product to obtain third purified oil; and carrying out centrifugal separation on the third purified oil to obtain the purified transformer oil.
  2. 2. The purification method according to claim 1, wherein the pore diameter of the microporous ceramic filter is 25-50 μm, and the filtration accuracy of the microporous ceramic filter is not more than 0.5 μm.
  3. 3. The purification method according to claim 1 or 2, characterized in that the flow rate of the transformer oil is below 0.5mm/s when filtered.
  4. 4. The purification process of claim 1, wherein the molecular sieve comprises mesoporous molecular sieve SBA-15.
  5. 5. The purification method according to claim 1 or 4, wherein the mass of the molecular sieve is 3 to 5% of the mass of the first purified oil.
  6. 6. The purification method according to claim 1 or 4, wherein the adsorption temperature is 25 to 35 ℃ and the time is 60 to 80min.
  7. 7. The purification method of claim 1, wherein the antioxidant comprises a phenolic antioxidant.
  8. 8. The purification method of claim 7, wherein the phenolic antioxidants comprise one or more of 2, 6-di-t-butyl-p-cresol, and 2, 6-di-t-butyl- α -dimethylamino-p-cresol.
  9. 9. The purification method according to claim 1, 7 or 8, wherein the mass ratio of the second purified oil to the antioxidant is 1:0.04-0.11.
  10. 10. The purification method according to claim 1, wherein the temperature of the oxidation reaction is 40-60 ℃ for a time period of more than 60min.

Description

Method for purifying transformer oil Technical Field The invention relates to the field of maintenance of power equipment, in particular to a method for purifying transformer oil. Background In the power industry, transformer oil is used as an insulating and cooling medium, and its performance directly affects the safe operation and life of the transformer. With the long-term use of the transformer, the oil product is deteriorated due to thermal decomposition, oxidation and impurity pollution, so that the insulation performance of the transformer is reduced, and even faults are caused. At present, common transformer oil purification methods comprise filtration, degassing, dehydration, antioxidant addition and the like, but the methods have the problems of high cost, poor purification effect and the like. For example, filtration is difficult to remove trace moisture and aged products in the oil, the degassing and dewatering processes are complex, high-temperature or vacuum equipment is required, the cost is high, the addition of antioxidants can affect the stability of the oil, and the recovery to the standard close to that of new oil is difficult. Disclosure of Invention The invention provides a method for purifying transformer oil, which has low cost and can recover the purified transformer oil to a new oil standard. The invention provides a method for purifying transformer oil, which comprises the following steps: Introducing transformer oil into a microporous ceramic filter for filtering to remove solid particles and macromolecular impurities, thereby obtaining first purified oil; Mixing the first purified oil with a molecular sieve at normal temperature and normal pressure for adsorption, and removing moisture, oxygen and partial aging products to obtain second purified oil; mixing the second purified oil with an antioxidant for oxidation reaction, and decomposing the residual aging product to obtain third purified oil; and carrying out centrifugal separation on the third purified oil to obtain the purified transformer oil. Preferably, the pore diameter of the microporous ceramic filter is 25-50 mu m, and the filtering precision of the microporous ceramic filter is not more than 0.5 mu m. Preferably, the flow rate of the transformer oil is lower than 0.5mm/s when filtering. Preferably, the molecular sieve comprises a mesoporous molecular sieve SBA-15. Preferably, the mass of the molecular sieve is 3-5% of the mass of the first purified oil. Preferably, the adsorption temperature is 25-35 ℃ and the adsorption time is 60-80 min. Preferably, the antioxidant comprises a phenolic antioxidant. Preferably, the phenolic antioxidant comprises one or more of 2, 6-di-tert-butyl-p-cresol, and 2, 6-di-tert-butyl- α -dimethylamino-p-cresol. Preferably, the mass ratio of the second purified oil to the antioxidant is 1:0.04-0.11. Preferably, the temperature of the oxidation reaction is 40-60 ℃ and the time is higher than 60min. The invention provides a method for purifying transformer oil, which comprises the following steps: Introducing transformer oil into a microporous ceramic filter for filtering to remove solid particles and macromolecular impurities, thereby obtaining first purified oil; Mixing the first purified oil with a molecular sieve at normal temperature and normal pressure for adsorption, and removing moisture, oxygen and partial aging products to obtain second purified oil; mixing the second purified oil with an antioxidant for oxidation reaction, and decomposing the residual aging product to obtain third purified oil; and carrying out centrifugal separation on the third purified oil to obtain the purified transformer oil. The method has the advantages that the transformer oil is filtered by a microporous ceramic filter, adsorbed by a molecular sieve, oxidized and centrifugally separated by an antioxidant, solid particles, macromolecular impurities, moisture, oxygen and aging products in the transformer oil are removed, so that the purified transformer oil reaches a new oil standard, high-temperature or vacuum environment is not needed for adsorption, the purification cost is reduced, the content of the antioxidant in the transformer oil is reduced while the aging products are removed by the oxidation reaction of the antioxidant, and the stability of the purified transformer oil is improved. Drawings FIG. 1 is a flow chart of a process for purifying transformer oil according to an embodiment. Detailed Description The invention provides a method for purifying transformer oil, which comprises the following steps: Introducing transformer oil into a microporous ceramic filter for filtering to remove solid particles and macromolecular impurities, thereby obtaining first purified oil; Mixing the first purified oil with a molecular sieve at normal temperature and normal pressure for adsorption, and removing moisture, oxygen and partial aging products to obtain second purified oil; mixing the second purified oil