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Application Case: Activated Alumina in Compressed Air Drying
Table of Contents
Background
An automotive spray workshop required dry, clean compressed air (dew point ≤ -40℃) for paint quality. The existing refrigerated dryer failed to remove moisture effectively, causing paint defects and equipment corrosion. The plant upgraded to an activated alumina adsorption dryer.
Solution: Activated Alumina Adsorption System
1.Setup
- 75kW screw air compressor (12 m³/min, oil ≤3ppm)
- 3-stage filtration (oil, dust, precision)
- Twin-tower dryer filled with 3–5mm activated alumina
- Heatless regeneration using 15% dry air
- High water adsorption (≥20%), stable dew point ≤ -50℃
- Resistant to oil mist (≤0.1ppm), 50% longer life than silica gel
- Low wear rate (<0.5%), avoids clogging
3.Performance
Parameter Value
Adsorption cycle 8 minutes
Regeneration method Heatless
Operating pressure 0.7 MPa
Outlet dew point ≤ -50℃
Results
- Dew point improved from -20℃ to -55℃—no more water mist
- 30% energy savings vs. heated dryers (~36,000 kWh/year)
- 60% lower maintenance costs (alumina replaced every 3 years)
Applications
- Food & pharma: meets ISO 8573-1 Class 2
- Electronics: protects sensitive parts from oxidation
- Pneumatic tools: extends service life
Note: Pre-oil removal (e.g., with activated carbon) is recommended to protect alumina.