The role of turbine insulating oil vacuum purifier

Steam turbine insulating oil (turbine oil) vacuum oil purifier is a key equipment specially used to purify the insulating oil of power equipment such as steam turbines and gas turbines. Its core function is to ensure that the oil meets high insulation and lubrication performance standards through vacuum dehydration, degassing and filtering impurities. The following is a detailed explanation of its specific functions and principles:

Core functions

1. Deep dehydration

- Remove free water, emulsified water and dissolved water in the oil (can be reduced to ≤10 ppm) to prevent moisture from causing the following consequences:

- Degradation of insulation performance (reducing breakdown voltage)

- Equipment corrosion (metal parts such as bearings and gears)

- Oil oxidation to generate acidic substances (accelerates sludge formation)

2. Efficient degassing

- Extract air, hydrogen and other gases dissolved in the oil (gas content can be reduced to ≤0.1%) to avoid:

- Bubbles reduce the strength of the oil film (causing lubrication failure)

- Partial discharge (threatening transformer/turbine insulation system)

3. Precision filtration

- Intercept particulate pollutants (metal chips, dust, etc., accuracy ≤1μm) to prevent:

- Mechanical wear (servo valve, bearing jamming)

- Oil circuit blockage (affecting circulation efficiency)

4. Oil regeneration

- Through the combined process of heating + vacuum + adsorption, the aging of oil is delayed and the service life is extended (3-5 times).

Working Principle

1. Vacuum Evaporation Dehydration

- The oil is heated to 50-70℃ and enters the vacuum tank. Under negative pressure below -0.095MPa, the boiling point of water drops below 40℃, and it is quickly vaporized and separated.

2. Condensate Capture

- The vaporized water is introduced into the condenser for liquefaction collection, and the dry oil is filtered twice by the precision filter element.

Application Scenarios

- Power industry: treatment of steam turbine, water turbine, transformer insulating oil (by IEC 60422 standard).

- Industrial field: lubricating oil maintenance of gas turbines and compressor units.

- Emergency treatment: rapid recovery of oil after moisture or contamination.

Technical parameter examples

|Indicators | Standard values | Detection methods |

|------------------|-------------------------|----------------------|

| Moisture content after treatment | ≤10ppm | Karl Fischer titration |

| Breakdown voltage | ≥60kV | ASTM D877 |

| Particle size | NAS 1638 below level 6 | Laser particle counter |

| Gas content | ≤0.1% | Vacuum pressure difference method |

Selection recommendations

1. Flow matching: ｓｅｌｅｃｔ according to the system oil volume (such as 1000L/h, 3000L/h, etc.).

2. Accuracy requirements: High-voltage equipment must be equipped with a filter element of ≤1μm.

3. Automation function: Priority is given to models with PLC control and online moisture monitoring functions.

Turbine oil treated by the vacuum oil purifier can ensure the recovery of equipment insulation strength and stability of lubrication performance, directly reducing the risk of unplanned downtime (for example, after a power plant applied it, the turbine failure rate dropped by 70%).