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Time：2025-07-14 14:30:30 Reading volume：
In the industrial field, the effect of oil filtration directly affects the life of equipment and operating efficiency. The following are the most effective industrial oil filtration methods currently selected in combination with different needs and technical characteristics:
Principle:
Through the step-by-step filtration of coarse filtration → fine filtration → deep treatment, impurities of different particle sizes are gradually removed.
Typical configuration:
- First stage: stainless steel metal mesh filter element (filter 50~100μm particles, protect subsequent filter elements).
- Second stage: glass fiber or cellulose filter element (filter 1~10μm particles).
- Third stage: polymer membrane filter element or electrostatic adsorption (filter 0.1~1μm ultrafine particles).
Advantages:
- Adapt to highly polluted oil and extend the life of the filter element.
- Customizable combination (such as adding a magnetic filter to remove iron filings).
Principle:
Heat the oil in a vacuum environment to evaporate and separate the water and gas, and then recover them through condensation.
Applicable scenarios:
- Transformer oil, hydraulic oil and other easily emulsified oils.
- Oil with water content > 500ppm.
Effect:
- Water content can be reduced to <50ppm, gas content <0.1%.
- With a precision filter element, particulate matter can be removed simultaneously.
Principle:
Use centrifugal force to throw out impurities with a density greater than oil (such as metal chips, sludge).
Advantages:
- No filter element is required, suitable for high viscosity lubricating oil or gear oil.
- Can handle a large amount of suspended matter, with low maintenance cost.
Limitations:
- Limited effect on particles <5μm, needs to be matched with fine filtration.
Principle:
Use a high-voltage electrostatic field to charge tiny particles and collect them by adsorption.
Effect:
- Can remove colloids and carbon particles of 0.01~1μm.
- Extend the service life of oil products by 3~5 times.
Application:
- Turbine oil, precision machine tool lubricant.
Principle:
Use a coalescing filter element to merge tiny water droplets into large droplets, and then separate them by gravity.
Typical use:
- Remove water from cutting fluid and fuel.
System composition:
- Oil pump + multi-stage filter + real-time monitoring (particle counter, humidity sensor).
Advantages:
- Non-stop filtration, suitable for key equipment (such as generator sets, rolling mills).
| Oil type | Recommended method | Target effect |
|------------------------------------|-----------------------------------------------------|-----------------------------------|
| High particle contamination oil | Multi-stage filtration + centrifugal separation | Particle size ≤ NAS 6 |
| Water-containing oil | Vacuum dehydration + coalescence separation | Water ≤ 0.05% |
| High viscosity oil (gear oil) | Centrifugal separation + heating filtration | Cleanliness ISO 4406 18/16/13 |
| Ultra-precision oil (turbine oil) | Electrostatic adsorption + membrane filtration | Particle size ≤ ISO 14/12/10 |
1. Pretreatment: first sedimentation or magnetic separation to remove large particles.
2. Temperature control: heat to 40~60℃ (reduce viscosity and improve filtration efficiency).
3. Real-time monitoring: install online sensors to adjust filtration parameters dynamically.
Note: Extremely contaminated or chemically degraded oils require regeneration (such as clay adsorption, distillation) rather than simple filtration.
