Industrial waste oil filtration equipment classification

Industrial waste oil filtration equipment is used to treat various types of industrial waste oil (such as lubricating oil, hydraulic oil, and transformer oil), removing contaminants such as impurities, moisture, gases, and colloids, enabling waste oil regeneration or compliance with discharge standards. The following are common equipment types and key technical features:

Main Filtration Equipment Types

1. Plate and Frame Oil Filter

- Principle: Physically intercepts impurities using filter cloth or paper.

- Filter Filter: 1-50 microns (adjustable with replaceable filter media).

- Application: Primary filtration of waste oil with high impurity content; low cost but low efficiency.

2. Vacuum Oil Filter

- Principle: Vacuum dehydration combined with precision filtration to remove moisture, gases, and particles.

- Filter Filter: ≤ 1 micron (with HEPA filter element).

- Application: High-value, moisture-sensitive oils such as transformer oil and turbine oil.

3. Centrifugal Oil Filter

- Principle: Centrifugal force separates impurities and moisture; no filter element is required.

- Accuracy: 0.5-5 microns (depending on the rotational speed).

- Suitable for: High-viscosity waste oil (e.g., gear oil) or oil containing a large amount of free water.

4. Coalescing Separation Oil Filter

Principle: The Coalescing filter element coalesces and separates tiny water droplets.

- Accuracy: Can process emulsified oil with a water content of ≤10%.

- Suitable for: Severely emulsified waste oils such as hydraulic oil and cutting fluid.

5. Electrostatic Oil Purifier

Principle: Electrostatic field adsorbs colloids and tiny particles.

- Accuracy: ≤0.1 micron (ultra-fine purification).

- Suitable for: Oils used in precision equipment (e.g., aviation lubricants).

Key Selection Parameters

1. Processing Capacity: ｓｅｌｅｃｔ based on the waste oil volume (e.g., 100 L/min or 10 m³/h).

2. Filtration Refinement: Determined by the oil's intended use (e.g., hydraulic systems require NAS grade 7 or below).

3. Functional Requirements: Is simultaneous dehydration, degassing, and deacidification required?

4. Oil Viscosity: High-viscosity oil requires heating or centrifugal equipment.

Typical Application Scenarios

- Waste Lubricating Oil Regeneration: Vacuum Oil Purifier + Activated Carbon Adsorption (Oxide Removal).

- Cutting Fluid Treatment: Coalescing Separation + Sterilization Device (Extended Service Life).

- Transformer Oil Recovery: Vacuum Oil Filtration + Molecular Sieve Dehydration (Dielectric Loss Ratio Meets Standards).

Precautions

- Safety: Waste oil may contain heavy metals or chemicals; an explosion-proof design is required.

- Environmental Protection: Filter residue should be treated as hazardous waste (e.g., HW08).

- Maintenance: Regularly ｒｅｐｌａｃｅ filter elements/filter cloths and monitor outlet oil quality (e.g., particle count, moisture content).

Recommended Standards

- International: ISO 4406 (Cleanliness), ASTM D6304 (Moisture).

Depending on the specific waste oil composition and the intended use (regeneration or disposal), a combination of various devices can be used to achieve optimal results.