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Time：2025-05-21 13:41:42 Reading volume：
Working principle of vacuum dehydration oil purification equipment
Vacuum dehydration oil purification equipment (such as a vacuum oil filter) is mainly used to remove moisture, gas (air), light hydrocarbons and tiny solid impurities in oil. It is suitable for the purification of transformer oil, lubricating oil, hydraulic oil and other insulating oils and industrial oils. Its core principle is to use vacuum separation + precision filtration technology. The main process is as follows:
- The oil first passes through a coarse filter (such as a 20~50μm filter element) to remove larger solid particles, metal chips and other mechanical impurities to protect subsequent equipment.
- The oil enters the heating system (electric heating or steam heating), and the temperature is controlled at 50~70℃ (transformer oil is usually ≤65℃) to reduce the viscosity of the oil and improve the evaporation efficiency of water and gas.
- The oil enters the vacuum separation tank, and in a high vacuum environment (-0.08~-0.099 MPa):
- Water evaporation: Since the boiling point of water decreases under vacuum (e.g., at -0.095 MPa, the boiling point of water is ≈40°C), the free water and dissolved water in the oil are rapidly vaporized.
- Gas precipitation: The air, hydrogen and other gases dissolved in the oil are precipitated due to the pressure reduction.
- Atomization or filming: The surface area of the oil is increased by spraying, rotating film, or packing a layer to accelerate the separation of water and gas.
- The evaporated water vapor and light hydrocarbons enter the condenser, are cooled and condensed into liquid water, collected in the water storage tank, and can be discharged manually or automatically.
- The dehydrated oil passes through a precision filter element (1~5μm) to remove residual tiny particles and ensure that the oil cleanliness meets the standard (such as NAS 1638 level 6 or ISO 4406 14/12/10).
- The purified, dry and clean oil is transported to the oil storage tank or directly reused by the oil output pump.
| Technology | Function | Advantages |
|----------|----------|---------|
| Vacuum separation | Efficient removal of moisture and gas | More thorough dehydration than traditional filtration, can handle dissolved water |
| Heating system | Reduce oil viscosity and improve dehydration efficiency | Avoid high-temperature oxidation (controllable temperature) |
| Atomization/film technology | Increase oil surface area | Accelerate water evaporation and increase processing speed |
| Multi-stage filtration | Remove impurities step by step | Extend filter life and ensure oil cleanliness |
- Transformer oil: remove moisture and gas, improve insulation strength (breakdown voltage ≥60 kV).
- Lubricating oil/hydraulic oil: extend oil life, prevent equipment corrosion and foaming problems.
- Turbine oil: remove moisture and acidic substances, and prevent sludge formation.
- Vacuum degree: Generally required to be ≤-0.095 MPa. Too low will affect the dehydration effect.
- Temperature control: Too high will cause oil oxidation, too low will affect the dehydration speed.
- Oil type: Some synthetic oils (such as ester oils) require special treatment to avoid foaming during vacuum degassing.
The vacuum dehydration oil purification equipment efficiently removes water, gas and impurities in the oil through a combination of heating + vacuum evaporation + precision filtration. It is suitable for high-standard oil treatment in industries such as power, petrochemicals, and machinery.
