externally heated purge desiccant air dryer for chemical

The externally heated purge desiccant air dryer adopts advanced externally heated airflow regeneration, delivering energy savings, stability, and high efficiency—especially suited for continuous and stable drying demands. With robust design and intelligent controls, it’s ideal for industries where quality, reliability, and precise air drying are essential.

Features of Externally Heated Purge Desiccant Air Dryer

1. High efficiency: Advanced externally heated regeneration achieves exceptional drying performance and low dew points for superior air quality.
2. Energy-saving design: Smart control of regeneration airflow and temperature reduces energy consumption without compromising performance.
3. Intelligent control: PLC system enables automatic operation and real-time status monitoring for efficient, reliable performance.
4. Strong durability: Stainless steel construction and top-quality components provide long-term, stable operation in harsh conditions.
5. Safety: Temperature over-temperature and pressure switches protect the equipment in abnormal situations.

Working Principle

1. Adsorption process: Wet air passes through the desiccant bed (molecular sieve/silica gel), where moisture is adsorbed and dry air is output. Adsorbent capacity gradually decreases during use.
2. Regeneration process: To restore the adsorbent, dry air is externally heated and passed through the bed, carrying away adsorbed moisture.
3. Airflow control: Orifice plate system regulates regeneration airflow, optimizing energy use for maximum savings.
4. Intelligent control: PLC automatically monitors and adjusts temperature, pressure, and other key parameters, with alarms/shutdowns for abnormal conditions.

Application Areas

• Electronics manufacturing: Supplies water-free air for PCB and semiconductor production, preventing moisture-related defects.
• Pharmaceutical industry: Delivers clean, dry compressed air to meet stringent health standards in drug manufacturing.
• Food processing: Ensures low humidity air for packaging and storage, preventing spoilage and moisture absorption.
• Mechanical processing: Protects CNC, casting, and precision equipment from corrosion and moisture damage.
• Chemical industry: Provides dry gas for chemical reactions, ensuring process stability and efficiency.
• Automotive industry: Used in production, spraying, and precision operations requiring ultra-dry air.

Standard Configuration

• PLC intelligent control for automatic operation and real-time monitoring
• RS485 Modbus communication, supporting remote control and fault output
• Temperature control system for safe operation
• Stainless steel heater with safety insulation tape
• Mechanical over-temperature protection switch
• Outlet pressure switch for airflow protection
• Regeneration air volume orifice plate for adjustable airflow and energy saving
• Imported stainless steel check valve to prevent backflow
• Double-acting imported butterfly valve for long-term reliability
• Stainless steel diffuser for uniform airflow distribution
• Large-capacity silencer to minimize noise

Optional Functions

• Dew point meter and control for real-time dew point management
• Touch screen display for intuitive operation

Customization Options

• Custom designs for high/low pressure, special gases, and all-stainless steel construction
• Ultra-low dew point and special gas processing solutions available on request