Search

CN-121975551-A - Mineral oil type transformer oil with low pour point and high gas-evolution resistance and preparation method thereof

CN121975551ACN 121975551 ACN121975551 ACN 121975551ACN-121975551-A

Abstract

The invention discloses mineral oil type transformer oil with low pour point and high gas-evolution resistance and a preparation method thereof. The low-pour-point high-gassing-resistance mineral oil type transformer oil is prepared by blending, by mass, 10-40% of a first component and 60-90% of a second component, wherein the pour point of the first component is smaller than-25 ℃, the kinematic viscosity of the first component is 8-11 mm 2 /s, the flash point is larger than 135 ℃, the aromatic carbon rate is 2-5%, the naphthenic carbon rate is not smaller than 50%, the gassing performance is not larger than +5mm 3 /min, the pour point of the second component is not larger than-60 ℃, the kinematic viscosity of the second component is 7-11 mm 2 /s, the flash point is larger than 135 ℃, and the aromatic carbon rate is smaller than 1%. The pour point of the transformer oil is lower than-50 ℃, the gassing property is lower than +10mm 3 /min, the transformer oil can simultaneously meet the requirements of GB 2536-2011 and IEC60296:2020 standard, and the use requirements of power equipment on low-temperature starting performance and long-term safe and stable operation under special environments can be met.

Inventors

  • FENG TAO
  • MA ZHIYUAN
  • SHANG XIHONG
  • WANG TAO
  • SONG JUNHUI
  • ZHANG CUIZHEN
  • LIU XUEJUN
  • YUAN YUZHEN
  • XU HAILONG
  • LI JUN
  • WANG HONGXIANG

Assignees

  • 中国海洋石油集团有限公司
  • 中海石油炼化有限责任公司
  • 中海沥青股份有限公司
  • 中海油化工与新材料科学研究院(北京)有限公司

Dates

Publication Date
20260505
Application Date
20260119

Claims (10)

  1. 1. The mineral oil type transformer oil with low pour point and high gas-evolution resistance is characterized by being prepared by blending the following components in percentage by mass: 10-40% of a first component; 60-90% of a second component; The pour point of the first component is smaller than-25 ℃, the kinematic viscosity of the first component is 8-11 mm 2 /s at 40 ℃, the flash point is larger than 135 ℃, the aromatic carbon rate is 2-5%, the naphthenic carbon rate is not smaller than 50%, and the gas-out property is not higher than +5mm 3 /min; the pour point of the second component is not higher than-60 ℃, the kinematic viscosity at 40 ℃ is 7-11 mm 2 /s, the flash point is higher than 135 ℃, and the aromatic carbon rate is less than 1%.
  2. 2. The low pour point high gassing resistant mineral oil type transformer oil of claim 1 wherein the transformer oil has a pour point below-50 ℃ and gassing below +10mm 3 /min, meeting both GB 2536-2011 and IEC60296:2020 standards.
  3. 3. The low pour point, high gassing resistant mineral oil type transformer oil according to claim 1 or 2 wherein said first component is obtained by a process comprising the steps of: fractionating naphthenic base crude oil at normal pressure to obtain 270-360 ℃ distillate oil, sequentially carrying out hydrogenation deacidification, solvent refining, clay refining and distillate cutting treatment to obtain 290-340 ℃ refined distillate oil, and adding a composite additive with the mass percent of 0.25-1.40% of the system to obtain the first component.
  4. 4. A low pour point, high gassing resistant mineral oil based transformer oil according to any of claims 1-3 wherein said second component is obtained by a process comprising the steps of: And (3) fractionating the naphthenic crude oil or the intermediate crude oil to obtain 280-380 ℃ distillate oil, sequentially hydrofining, hydrodewaxing, hydrofining and cutting the distillate oil to obtain 290-350 ℃ refined distillate oil, and adding a compound additive with the mass percent of 0.25-1.40% into the refined distillate oil to obtain the second component.
  5. 5. The low pour point, high gassing resistant mineral oil type transformer oil of claim 3 or 4 wherein said complex additives in said first component or said second component are comprised of DBPC and/or DBP and a complex of a monocyclic aromatic compound wherein said monocyclic aromatic compound is selected from 1-phenyldodecane and/or benzyltoluene.
  6. 6. A process for the preparation of a low pour point high gassing resistant mineral oil type transformer oil as claimed in any one of claims 1 to 5 comprising the steps of: (1) Fractionating naphthenic crude oil at normal pressure to obtain 280-360 ℃ distillate oil serving as a raw material, sequentially carrying out hydrogenation deacidification, solvent refining, clay refining and distillate cutting treatment to obtain 290-340 ℃ refined distillate oil, and adding a composite additive to obtain the first component; (2) Fractionating naphthenic crude oil or intermediate crude oil to obtain 280-380 ℃ distillate oil, sequentially carrying out hydrofining, hydrodewaxing, hydrofining and fraction cutting to obtain 290-340 ℃ refined distillate oil, and adding a composite additive to obtain the second component; (3) And mixing the first component with the mass percentage of 10-40% and the second component with the mass percentage of 60-90% to obtain the low pour point high gas-resistant mineral oil type transformer oil.
  7. 7. The method according to claim 6, wherein the cutting temperature of the cycloalkyl crude oil is 270-360 ℃; In the step (1), the hydrogenation deacidification oil is refined by a solvent to obtain solvent raffinate oil; The hydrogenation deacidification temperature is 270-330 ℃, the hydrogen partial pressure is 2.5-5.0 MPa, the volume space velocity is 0.8-1.2 h -1 , the hydrogen oil volume ratio is 500-1000:1, and the catalyst is selected from at least one amorphous silicon-aluminum catalyst of nickel-molybdenum, nickel-tungsten, cobalt-molybdenum, molybdenum-cobalt-nickel and molybdenum-nickel-tungsten.
  8. 8. The preparation method of the organic solvent according to claim 6 or 7, wherein in the step (1), the extraction solvent adopted in the solvent refining is furfural or NMP, the volume ratio of the extraction solvent to the oil is 1.0-3.0:1, and the temperatures of the top of the extraction tower and the bottom of the extraction tower are 70-120 ℃ and 40-80 ℃ respectively; The solvent raffinate oil is refined through clay to obtain white essential oil; the clay adopted in clay refining is common clay or activated clay, the clay is added in a mass percentage of 1% -5%, the temperature is 90-130 ℃, and the time is 15-60 min.
  9. 9. The preparation method of the antioxidant composite additive is characterized in that in the step (1), the cutting temperature of the fraction is 290-340 ℃, and the antioxidant composite additive is added in an amount of 0.25-1.40% by mass based on the total system; in the step (2), the cutting temperature of the cycloalkyl crude oil or the intermediate crude oil is 280-380 ℃, and the kinematic viscosity of the cycloalkyl crude oil or the intermediate crude oil is 8-12 mm 2 /s; In the step (2), the hydrofining temperature is 300-390 ℃, the hydrogen partial pressure is 8-15 MPa, the volume space velocity is 1.5-2.0 h -1 , and the hydrogen-oil volume ratio is 500-800:1; The temperature of the hydrodewaxing is 270-370 ℃, the hydrogen partial pressure is 8-15 MPa, the volume space velocity is 0.8-1.5 h -1 , and the hydrogen-oil volume ratio is 500-1000:1.
  10. 10. The preparation method of the catalyst according to any one of claims 5 to 9, wherein in the step (2), the hydrofinishing temperature is 270 to 370 ℃, the hydrogen partial pressure is 8 to 15MPa, the volume space velocity is 0.8 to 1.5h -1 , and the hydrogen-oil volume ratio is 500 to 1000:1; the cutting temperature of the fraction is 290-350 ℃, and the additive mass percentage of the composite additive is 0.25-1.40% based on the total system.

Description

Mineral oil type transformer oil with low pour point and high gas-evolution resistance and preparation method thereof Technical Field The invention belongs to the technical field of petrochemical product processing, and relates to mineral oil type transformer oil with low pour point and high gas-evolution resistance and a preparation method thereof. Background The transformer oil is an insulating oil product which is suitable for oil-filled electrical equipment such as transformers, reactors, transformers, bushings and the like and has the functions of insulation and cooling. The mineral oil type transformer oil is prepared from crude oil through processes such as fractionation and refining, and is a type of transformer oil product with the largest use amount in the power industry. Domestic mineral oil type transformer oil is basically produced according to the requirements of GB 2536-2016 'unused mineral insulating oil for electrical fluid transformers and switches', and no explicit requirements on anti-gassing performance are made. When partial power equipment is used in a special environment, the method has higher requirements on indexes such as pour point, anti-gassing property and the like of the mineral oil type transformer oil, so as to ensure that the engine keeps good low-temperature starting performance and long-period stable operation. The transformer oil prepared by the solvent extraction process retains a certain amount of aromatic hydrocarbon, so that good anti-gassing performance can be ensured, but too much aromatic hydrocarbon can cause oxidation stability to not meet the IEC60296:2020 standard requirement. In addition, the solvent extraction process is mainly a physical refining process, so that the pour point of the raw material can not be reduced almost, the requirement on the pour point of the raw material is high, and the selection range is small. The pour point of the raw material of the domestic transformer oil is generally above-30 ℃, so that the pour point of the transformer oil prepared by the solvent extraction process is difficult to be lower than-50 ℃. The transformer oil prepared by the hydrogenation process has lower pour point, can meet the requirement of low-temperature starting performance of the transformer, but the hydrogenation process basically realizes saturation of aromatic hydrocarbon in raw materials, so that the anti-gassing performance is poor, gas is easy to separate out in the use process, and the functional characteristics such as breakdown voltage are influenced. Therefore, mineral transformer oil with pour point lower than-50 ℃ and gas-out property lower than +10mm 3/min is needed, which can meet the requirements of GB 2536-2011 and IEC60296:2020 standards, has good low-temperature performance and gas-out resistance, and can meet the use requirements of power equipment in special environments. Disclosure of Invention The invention aims to provide mineral oil type transformer oil with low pour point and high gas-evolving resistance and a preparation method thereof, wherein the pour point of the transformer oil is lower than-50 ℃ and the gas-evolving resistance is lower than +10mm 3/min, and the transformer oil can simultaneously meet the requirements of GB 2536-2011 and IEC60296:2020 standard, and can meet the use requirements of power equipment on low-temperature start-up and long-term safe and stable operation under special environments. The invention provides a low pour point high gas-separation resistance mineral oil type transformer oil, which is prepared by blending the following components in percentage by mass: 10-40% of a first component; 60-90% of a second component; The pour point of the first component is smaller than-25 ℃, the kinematic viscosity of the first component is 8-11 mm 2/s at 40 ℃, the flash point is larger than 135 ℃, the aromatic carbon rate is 2-5%, the naphthenic carbon rate is not smaller than 50%, and the gas-out property is not higher than +5mm 3/min; the pour point of the second component is not higher than-60 ℃, the kinematic viscosity at 40 ℃ is 7-11 mm 2/s, the flash point is higher than 135 ℃, and the aromatic carbon rate is less than 1%. In the invention, the transformer oil is prepared by blending any one of the following components 1) to 3) in percentage by mass, wherein 1) the first component is 20% and the second component is 80%; 2) 40% of a first component and 60% of a second component; 3) 30% of the first component and 70% of the second component. In the low-pour-point high-gassing-resistance mineral oil type transformer oil, the pour point of the transformer oil is lower than-50 ℃, the gassing is lower than +10mm 3/min, the transformer oil can simultaneously meet the requirements of GB 2536-2011 and IEC60296:2020 standard, has good low-temperature performance and gassing resistance, and can meet the use requirements of power equipment in special environments. In the low pour point high gassing resistant mineral oil