Heatless Combined Compressed Air Dryer

Detailed Description

• Process Flow

  • Precooler (Refrigerated Dryer): Compressed air first passes through the precooler, exchanging heat with outgoing dry air to lower the inlet temperature and condense bulk water; this reduces evaporator load.
  • Evaporator & Separator: Air is cooled in the evaporator to approximately +5°C dew point, condensing most water, oil and particulates. Condensate is removed by an air–water separator and expelled via an automatic drain.
  • Oil Removal & Final Drying: The air then passes through an oil removal filter and enters the desiccant bed, where adsorption reduces the dew point to the specified level (depending on desiccant and sizing).
  • Regeneration Loop (Heatless): A portion of the dried compressed air is diverted and used to purge and regenerate the offline desiccant bed, then returned via the precooler—this simultaneously warms the dry air (preventing downstream condensation) and assists desiccant regeneration.

• Key Components

  • Refrigerated precooler and evaporator
  • Air–water separator with automatic drain
  • Oil removal (coalescing) filter
  • Two-tower desiccant adsorption unit
  • Solenoid/pneumatic valves and control panel

• Performance Highlights

  • Typical refrigerated stage dew point: ~+5°C
  • Final heatless desiccant dew point: down to -20°C to -40°C
  • Low maintenance and stable operation
  • Stable outlet temperature through heat recovery

Features

• Dual-stage drying combining refrigerated condensation and desiccant adsorption
• Energy-saving precooler loop reducing evaporator load
• Automatic condensate draining and coalescing filtration
• Heatless regeneration without external heaters
• User-friendly control system with alarms and indicators
• Modular structure for flexible installation

Applications

• Pneumatic tools and control systems
• Instrument air lines
• Painting and coating operations
• Food & beverage processing
• Pharmaceutical production
• Electronics manufacturing

Typical Technical Specifications 

• Capacity range: 0.5 — 50 m³/min
• Operating pressure: 4 — 16 bar(g)
• Refrigerated outlet dew point: ~+5°C
• Final pressure dew point (PDP): -20°C to -40°C
• Regeneration method: Heatless purge
• Power supply: 220/380 V, 50/60 Hz
• Control system: PLC or microprocessor
• Filtration: Integrated oil and dust filters

Installation & Maintenance

• Installation

  • Level foundation with adequate ventilation
  • Correct piping layout to minimize pressure loss
  • Proper condensate discharge connection

• Maintenance

  • Regular inspection of filter elements
  • Periodic check of automatic drains
  • Timely replacement of desiccant
  • Verification of valve and cycle operation

Certifications & Compliance

Designed to meet requirements of ISO 8573 compressed air quality standards and regional certification systems (CE, etc.), supporting applications with high air purity demands.

Ordering Information & Options

• Multiple flow capacities and dew point configurations
• Optional remote monitoring, enhanced filtration, stainless components
• Skid-mounted integrated systems available
• Complete documentation provided with each unit

Comparison with Similar Products

FAQ

• Q: What dew point can this system achieve?
  A: Refrigerated stage ~+5°C, final stage -20°C to -40°C depending on configuration.
• Q: Why choose a combined dryer?
  A: It offers efficient moisture removal and stable low dew point with simplified maintenance.
• Q: How much purge air is required?
  A: Typically 5–20% of nominal air flow.