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Time：2025-05-06 16:43:32 Reading volume：
Filtering high-viscosity industrial oils (such as gear oil, rolling oil, heavy lubricating oil, etc.) requires the selection of a suitable oil purifier to ensure efficient separation of impurities and water, while avoiding equipment blockage or excessive energy consumption due to excessive viscosity. The following are the selection and use recommendations for oil purifiers for high-viscosity oils:
1. Heating the vacuum oil filter
- Principle: Reduce the viscosity of the oil by heating (usually heating to 50~70℃), combined with vacuum dehydration and high-precision filtration.
- Applicable scenarios:
- High-viscosity oils (such as gear oils above ISO VG 460) contain water and trace impurities.
- Industrial lubricating oils that require deep dehydration (water content > 500ppm).
- Advantages:
- Viscosity is reduced after heating, and filtration efficiency is improved.
- Water, gas and particulate matter can be removed at the same time.
2. Centrifugal oil purifier
- Principle: Use centrifugal force to separate impurities and water with different densities in the oil (no filter element is required).
- Applicable scenarios:
- Heavy oil containing a large amount of solid particles or free water (such as rolling oil, ship oil).
- Oil products with extremely high viscosity (such as VG 1000 and above) and large impurity particle size.
- Advantages:
- No filter element clogging problem, low maintenance cost.
- Large processing volume, suitable for continuous operation.
3. High viscosity special pressure oil filter
- Principle: Use a high-pressure oil pump to force the oil to pass through high-strength filter materials (such as metal filter, glass fiber filter element).
- Applicable scenarios:
- Filtering of solid particles in viscous oil (such as metal processing oil, asphalt additives).
- Customized filtration accuracy is required (1~50μm optional).
- Advantages:
- High-pressure resistant design, adaptable to the flow resistance of high-viscosity oil.
- A heater can be installed to assist filtration.
4. Electrostatic oil purifier
- Principle: Use an electrostatic field to adsorb tiny pollutants such as colloids and oxides.
- Applicable scenarios:
- Severely aged high-viscosity oil (such as transformer oil, synthetic lubricating oil).
- Need to remove non-particle pollutants such as colloids and carbides.
- Advantages:
- Effective for submicron pollutants (<1μm).
| Parameter | Recommended range | Description |
|--------------------|---------------------------------------|----------------------------------------------------------|
| Heating temperature | 50~80℃ (adjusted according to the flash point of the oil) | Too high temperature may cause oxidation of the oil, which needs to be 20℃ lower than the flash point. |
| Filtration accuracy | 5~30μm (depending on the degree of contamination) | High viscosity oil usually chooses a lower accuracy (such as 10μm) to avoid frequent clogging. |
| Flow rate | ｓｅｌｅｃｔ according to system requirements (such as 200~1000L/min) | High viscosity oil needs to reduce the nominal flow rate by 30%~50% (actual flow rate is slow). |
| Pressure resistance | ≥0.6MPa | High viscosity oil has large flow resistance, and the equipment needs to withstand higher pressure. |
| Material compatibility | Stainless steel/fluororubber seals | Avoid oil corrosion equipment (such as sulfur-containing oil requires stainless steel 316 material). |
1. Preheating the oil:
- Turn on the heating function first, and wait until the oil temperature rises to the target temperature (such as 60℃) before starting the filtration, otherwise, it is easy to damage the oil pump.
2. Gradient filtration:
- First coarse filter (such as 50μm) to remove large particles, and then fine filter (such as 10μm) to protect the high-precision filter element.
3. Anti-solidification measures:
- Immediately drain the residual oil in the pipeline after shutdown to prevent low-temperature solidification and blockage.
4. Viscosity monitoring:
- Regularly test the oil viscosity (such as using a viscometer) to ensure that the filtering conditions match.
- Filter element replacement: The life of high-viscosity oil filter elements is short and needs to be maintained according to the pressure difference (ｒｅｐｌａｃｅ when >0.3MPa) or time (every 200~300 hours).
- Common faults:
- Heating failure: Check whether the thermostat and heating tube are damaged.
- Flow rate decrease: It may be due to insufficient oil temperature or filter element blockage, and the temperature needs to be increased or the spare filter element needs to be switched.
- Short-term demand: rent a heated oil filter (such as processing disposable waste oil).
- Long-term demand: invest in centrifugal equipment (no consumables cost, suitable for highly polluted oil products).
According to your specific oil type (such as name, ISO viscosity grade) and contamination (water content, particle content), the selection plan can be further optimized.
