4 Steps to Purify the Compressed Air_Suzhou Chanun Compressor Co., Ltd.

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4 Steps to Purify the Compressed Air

Release time:

2025-06-18

1.Moisture Removal

Moisture in compressed air primarily originates from the condensation of atmospheric water vapor during the compression process. When the temperature drops, this moisture can cause pipeline corrosion, valve sticking, and even affect product quality.

Core Technologies and Equipment:

Refrigerant Air Dryers: Cool compressed air to 2–10°C through a refrigeration cycle, condensing water vapor into liquid water for discharge. Suitable for general industrial scenarios, with pressure dew points typically controlled at around +3°C.
Adsorption Air Dryers: Use adsorbents like activated alumina and molecular sieves to deeply adsorb moisture, reducing pressure dew points to -40°C or even -70°C. Ideal for industries with extremely high dryness requirements, such as pharmaceuticals and semiconductors.
Air Receiver Pre-treatment: As a system buffer, it can deposit approximately 60% of liquid water. The bottom drain valve requires regular maintenance.

2. Oil Removal

Oil contamination mainly comes from compressor lubricants and atmospheric hydrocarbons, which can clog equipment, contaminate products, and even cause safety accidents.

Graded Treatment Solutions:

Primary Oil Removal: Employ oil mist separators or cyclone separators to remove over 90% of oil droplets (particle size >1μm).
Deep Oil Removal:
- Activated Carbon Filters: Adsorb residual oil vapor, reducing oil content to below 0.01mg/m³.
- Catalytic Combustion Units: Convert oil molecules into CO₂ and H₂O via catalysts at temperatures above 150°C, achieving zero air consumption for oil removal. After Inner Mongolia Mengniu Dairy adopted this technology, oil content dropped from the pre-transformation system level to 0.001–0.003mg/m³, meeting the ISO 8573-1 Class 0 oil-free standard.
Source Control: In food and medical industries, direct use of oil-free air compressors or water-lubricated air compressors is recommended to avoid oil contamination from the source.

3.Dust Removal

Inertial Impaction: Large particles (>1μm, such as metal shavings) cannot follow airflow direction due to high mass, colliding with filter media and being captured.
Direct Interception: 0.1–1μm particles are blocked by dense filter media fibers.
Brownian Diffusion: Ultrafine particles (<0.1μm, such as viruses) move randomly, increasing the probability of colliding with filter media.
Gravitational Sedimentation: Aggregated particles naturally fall in deceleration zones (60% of large particles in steel plants are removed this way).
Electrostatic Adsorption: Charged filter media actively capture 0.01μm oil mist, increasing defogging efficiency by 40% in the chemical fiber industry.

4.Bacteria and Odor Removal

In industries like food and pharmaceuticals, microbial contamination can cause product spoilage and even health issues.

Bacteria and Odor Removal Technologies:

Membrane Filtration: Use 0.01μm ultrafine glass fiber filter elements, achieving a 99.999% bacterial removal rate—standard for pharmaceutical enterprises.
UV Sterilization: Destroy microbial DNA via 253.7nm UV light, requiring no chemicals and causing no secondary pollution.
High-temperature Sterilization: Utilize compressed air at 120–160°C for natural temperature sterilization, followed by cooling treatment.
Ozone Sterilization: Ozone’s strong oxidizing property enables broad-spectrum sterilization, but concentration must be strictly controlled to prevent harm to humans.