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Time：2025-11-12 11:18:27 Reading volume：
Industrial oil impurity separation systems come in many forms, but they can generally be categorized according to their core separation principles. Understanding these categories helps users ｓｅｌｅｃｔ the most suitable system based on oil type, contaminant characteristics, and purification requirements.
These systems use filter media to physically block solid impurities from passing through.
Working Principle:
Oil passes through filter media with microscopic pores—such as filter paper, glass fiber, metal mesh, or synthetic fibers—which trap particles larger than the pore size.
Key Features:
Wide filtration precision range (from 100 μm down to 1 μm or lower)
Main target: solid particulate contamination
Common uses: hydraulic and lubrication systems, refueling equipment, portable oil filters
Subtypes:
Surface filtration: Metal mesh filters trap particles on the surface, making them easy to clean and reuse.
Depth filtration: Fiberglass filters capture particles within the media’s internal pores; large dirt-holding capacity but are typically non-washable.
Working Principle:
Consists of multiple filter plates and frames with filter cloth or paper between them. Oil is forced through under pressure, and impurities form a filter cake on the surface.
Key Features:
High throughput, suitable for oils with heavy solid contamination
Replaceable and low-cost filter media
Limited dehydration capability through filter paper adsorption
Typical Applications:
Pre-treatment of waste lubricating oil, quenching oil, and rolling oil.
These systems utilize the density difference between impurities and oil for the purpose of separation.
Working Principle:
Rely on gravity—denser water and solids naturally settle at the bottom.
Features:
Simple and low-cost
Low efficiency; requires long settling time
Commonly used for pre-treatment before fine filtration
Working Principle:
High-speed rotation creates centrifugal force, driving denser water and solid particles outward, while clean oil moves toward the center and exits.
Key Features:
Much faster than gravity separation
Ideal for removing free water and large solid particles
Limited effect on emulsified water or ultra-fine particles
Common Applications:
Marine diesel oil, turbine oil, and metalworking fluids.
These systems are designed for oil–water separation, especially for emulsified and dissolved water.
Working Principle:
Coalescing stage: Oil passes through a coalescing element that merges fine water droplets into larger ones.
Separation stage: Larger droplets sink and separate from the oil due to density difference.
Features:
Excellent dehydration performance for both free and emulsified water
High solid filtration accuracy
No need for heating or chemicals
Typical Applications:
Turbine oil, hydraulic oil, transformer oil, and other moisture-sensitive oils.
The vacuum oil purifier represents the most advanced and effective technology for dehydration and degassing.
Working Principle:
Under vacuum, the boiling point of water decreases sharply. Oil is atomized into a thin film or mist inside the vacuum chamber, allowing moisture, gases, and volatile components to evaporate rapidly. The oil remains stable due to its higher boiling point.
Features:
Deep dehydration and degassing capability
Preserves oil quality (purely physical separation)
High efficiency, ideal for severely water-contaminated oils
Common Applications:
High-voltage transformer insulating oil, turbine oil, hydraulic oil, and other critical systems.
These systems remove chemical contaminants such as acids, pigments, and oxidation by-products.
Working Principle:
Oil flows through a tower or cartridge containing adsorbents that remove impurities through physical or chemical adsorption.
Common Adsorbents:
Activated alumina: Removes acidic compounds
Silica gel, activated clay: Acid removal and decolorization
Molecular sieve: Deep dehydration
Features:
Restores oil’s chemical properties
Commonly paired with vacuum filtration for complete purification
Applications:
Regeneration of aged lubricating oil and transformer oil deacidification.
| Contaminant Type | Primary System | Auxiliary System |
|---|---|---|
| Solid particles | Cartridge filter, Plate & Frame filter, Centrifuge | — |
| Free water | Centrifuge, Coalescing Separator, Vacuum Filter | Settling Tank (pretreatment) |
| Emulsified/Dissolved water | Vacuum Filter, Coalescing Separator | — |
| Dissolved gases | Vacuum Filter | — |
| Chemical/acidic contaminants | Adsorption Filter (Regeneration Unit) | Pre-filtration (e.g., vacuum filter) |
To achieve comprehensive purification, modern oil purifiers often combine multiple separation technologies:
Vacuum Coalescing Oil Filter: Combines coalescing dehydration with vacuum degassing.
Vacuum Oil Purifier with Adsorption Filter: Performs deep dehydration and degassing, followed by chemical purification for maximum oil recovery.
In many industrial scenarios, a combination of vacuum, coalescence, and adsorption technologies delivers the most efficient, long-term purification performance.
