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Time：2025-03-25 11:48:05 Reading volume：
Turbine Oil can be filtered, but the appropriate filtering method and equipment must be selected according to the oil status, pollution type and system requirements. The following is a specific analysis:
- Protect precision parts: Turbine bearings, gears, etc. have high requirements for oil cleanliness (usually ISO 4406 15/13/10 or better).
- Extend oil life: Filtration can remove oxidation products, moisture and particulate matter, slowing down oil degradation.
- Prevent failure: Avoid lubrication failure caused by particle wear, moisture corrosion, or bubbles.
| Pollutants | Filtration method | Technical points |
|------------------|---------------------------|------------------------------------------|
| Solid particles | Mechanical filtration | ｓｅｌｅｃｔ high-precision filter elements with β≥200 (such as 3~5μm) |
| Free water | Coalescing separation/vacuum dehydration | Coalescing filter elements enlarge water droplets and then separate them, and vacuum dehydration can treat dissolved water |
| Emulsified water | Demulsification + centrifugal separation | Add demulsifier or use high-speed centrifuge (＞8000rpm) |
| Air/bubbles | Vacuum degassing or static defoaming | Online degassing device can remove microbubbles in real-time |
| Colloid/oil sludge | Electrostatic adsorption or deep fine filtration | Electrostatic oil purifier or cellulose composite filter element |
(1) Online circulation filtration
- Applicable scenarios: continuous purification during unit operation.
- Equipment examples:
- Bypass oil filter: independent circulation filtration, no interference with the main system (such as Pall HCP series).
- Self-cleaning filter: with differential pressure feedback, and automatic backwashing (such as Sefar automatic scraper filter).
(2) Offline deep purification
- Applicable scenarios: when the oil is seriously contaminated or regularly maintained.
- Equipment examples:
- Vacuum oil filter: simultaneous dehydration, degassing, and particle removal (such as CJC® HDU series).
- Centrifuge: handles oil with high water content (such as Alfa Laval MOPX).
(3) Electrostatic purification (special working conditions)
- Advantages: can remove colloidal particles and oxides below 0.1μm.
- Limitations: must be used in conjunction with mechanical filtration, and cannot remove moisture.
- Temperature control: the oil temperature should be maintained at 40~60℃ (too high accelerates oxidation, too low increases viscosity).
- Filter element compatibility:
- Avoid contact between cellulose filter elements and certain ester synthetic oils (may dissolve).
- For phosphate ester fire-resistant oils (such as EH oil for steam turbine units), special fluoro resin filter materials are required.
- Monitoring indicators:
- Cleanliness (ISO 4406), moisture content (ASTM D6304), acid value (ASTM D664).
Case: Gas turbine oil system maintenance
- Problem: Metal particles (Fe＞100ppm) and moisture (＞500ppm) in the oil.
- Solution:
1. First stage: Offline vacuum oil filter dehydrates to <100ppm and filters to NAS level 6 at the same time.
2. Second stage: Install a magnetic filter to absorb iron chips and add antioxidants.
3. Long-term maintenance: bypass circulation filtration (3μm accuracy) + weekly oil inspection.
- Complete oil deterioration: such as base oil cracking,and additive depletion (oil change required).
- Chemical contamination: strong acid/alkali intrusion or fuel dilution (chemical treatment or replacement required).
Turbine oil can be effectively purified by professional filtering equipment, but it is necessary to ｓｅｌｅｃｔ appropriate technology according to the type of contamination and regularly test the oil performance. For key equipment (such as aircraft engines and nuclear power turbines), it is recommended to entrust professional oil service companies to carry out customized processing.
