Heat of Compression Desiccant Air Dryers
A trusted Heat of compression desiccant air dryers manufacturer and supplier in China, delivering energy-efficient solutions for industrial compressed air systems.
Compression heated adsorption air dryers are advanced desiccant dryers designed to remove moisture from compressed air while maximizing energy efficiency. These systems use high-performance desiccant materials to adsorb water vapor, ensuring a consistent supply of clean, dry, and ultra-low dew point compressed air.
What distinguishes compression heated dryers from other adsorption air dryers is their ability to reuse the heat generated during air compression for desiccant regeneration. Instead of relying on purge air or external heaters, compressed air is heated and directed through the saturated desiccant bed to release absorbed moisture. This process significantly reduces energy consumption and operating costs while maintaining continuous, reliable drying performance.
Compression heated adsorption air dryers are ideal for industrial applications requiring ultra-dry air, stable operation, and long-term energy savings.
Flexible Communication:RS-485 standard, optional IoT connectivity.
Energy-Saving Control:EBZ200-2 control reduces energy use by over 10%.
Dew-Point Control (Optional):Load-based control saves over 30% energy.
High-Performance Desiccant:20% extra filling for stable, efficient adsorption.
Reliable Components:Premium valves and high-efficiency cooler ensure durability.
Metal Control-Air Piping:Strong, durable, and reliable.
Optimized Airflow:Improves desiccant utilization with lower pressure drop.
Smart Touchscreen Control:Siemens touchscreen for real-time operating monitoring.
Dew Point Monitoring:Real-time dew point monitoring ensures stable drying performance.
Siemens Touchscreen Control:Siemens touchscreen with RS-485 for monitoring and system integration.
Reliable Pneumatic Valves:High-performance valves with feedback control improve system reliability.
Automatic Flow Control:Automatically adapts to 30–110% load variations.
Intelligent Drainage:Automatic condensate monitoring and drainage ensure reliable operation.
Partial-/Full-Flow Operation:Seamless mode switching improves safety and reduces energy consumption.
Differential Pressure Protection:Automatic monitoring and protection help maintain continuous air supply.
Galvanized Piping:Hot-dip galvanized piping improves corrosion resistance and service life.
Skid-Mounted Design:DN150+ piping and pressure vessels are integrated into a certified skid-mounted assembly.
Heat of Compression (HOC) desiccant air dryers use the high-temperature heat generated during air compression to regenerate the desiccant.
Instead of relying primarily on electric heaters or large amounts of compressed purge air, the dryer recovers available compressor discharge heat and uses it during desiccant regeneration.
Lingyu offers two Heat of Compression configurations:
They are particularly suitable for large, continuously operating compressed air systems where high-temperature compressor discharge air is available.
During adsorption, compressed air passes through one desiccant tower, where water vapor is removed before the dry air continues downstream.
During regeneration, high-temperature compressed air from the compressor is directed through the saturated desiccant bed. The available compression heat releases the adsorbed moisture and regenerates the desiccant.
The regenerated bed is then cooled before the towers switch automatically.
Process Flow:
Hot Compressor Discharge Air → Heating / Regeneration → Cooling → Adsorption → Tower Switching
Because regeneration energy is recovered from the compression process, HOC dryers can significantly reduce dependence on external regeneration energy when correctly matched with the compressor system.
| Parameter | HOC-E Low-Purge | HOC-Z Zero-Purge |
|---|---|---|
| Regeneration energy | Compression heat | Compression heat |
| Regeneration air consumption | ≤3% | 0% |
| Rated inlet pressure | 0.7 MPa | 0.7 MPa |
| Operating pressure | 0.6–1.0 MPa | 0.6–1.0 MPa |
| Rated inlet temperature | 120°C | 120°C |
| Allowable inlet temperature | 110–180°C | 110–180°C |
| Pressure dew point | -20°C / -40°C optional | -20°C / -40°C optional |
| Cooling-water temperature | ≤32°C | ≤32°C |
| Cooling-water pressure | 0.2–0.6 MPa | 0.2–0.6 MPa |
| Standard airflow range | 13.5–210 m³/min | 13.5–260 m³/min |
| Approx. airflow range | 477–7,416 CFM | 477–9,181 CFM |
| Cooling-water flow | Approx. 5.5–86 t/h | Approx. 10–156 t/h |
The HOC-E Series uses a small amount of product air during the regeneration and cooling process, with regeneration air consumption limited to ≤3%.
The HOC-Z Series uses a zero-purge regeneration configuration so that compressed product air is not consumed during regeneration.
Heat of compression dryers should be selected according to the compressor and dryer as one integrated system, rather than according to airflow alone.
Key parameters include:
| Selection Parameter | What to Check |
| Airflow | CFM / SCFM / m³/min |
| Working pressure | Standard 0.6–1.0 MPa |
| Compressor discharge temperature | 110–180°C allowable |
| Required PDP | -20°C / -40°C |
| Regeneration air requirement | ≤3% or 0% |
| Cooling-water temperature | ≤32°C |
| Cooling-water pressure | 0.2–0.6 MPa |
| Cooling-water flow | Depends on selected model |
| Compressor load profile | Continuous / variable |
| Annual operating hours | Important for TCO |
The compressor discharge temperature must remain high enough to provide sufficient regeneration heat.
For systems with highly variable loads or insufficient discharge temperature, another regeneration technology may be more suitable.
Choose the HOC-E Low-Purge Series when:
Choose the HOC-Z Zero-Purge Series when:
Zero purge does not mean zero energy consumption. Cooling-water circulation, controls, pressure loss, and the overall compressor/dryer operating condition should still be included in the energy evaluation.
| Factor | Heatless | Externally Heated | Blower Heated | HOC |
| Main regeneration source | Dry purge air | Heater | Blower + heater | Compression heat |
| Purge air | 8–14%* | 4–8%* | 0–3%* | 0–3%* |
| External regeneration heat | No | Yes | Yes | Recovered compressor heat |
| Compressor dependency | Low | Low | Low | High |
| Typical system size | Small–medium | Medium–large | Medium–large | Large |
| Best operating profile | General | Continuous | Continuous | Continuous high-load |
| Main TCO consideration | Purge loss | Purge + heater | Blower/heater | Compressor integration |
*Based on the corresponding Lingyu product series technical data.
HOC technology generally becomes more attractive as airflow and annual operating hours increase, provided sufficient compression heat is continuously available.
The Lingyu HOC-E and HOC-Z Series have a rated inlet temperature of 120°C and an allowable inlet temperature range of 110–180°C.
Both series are available with -20°C or -40°C pressure dew point configurations.
The HOC-E Series uses ≤3% regeneration air, while the HOC-Z Series specifies 0% regeneration air consumption.
Yes. The provided HOC-E and HOC-Z configurations use cooling water. The specified cooling-water temperature is ≤32°C, with a pressure range of 0.2–0.6 MPa.
The HOC-E Series covers 13.5–210 m³/min, while the HOC-Z Series covers 13.5–260 m³/min in the standard technical range provided.
HOC should be considered when high-temperature compressor discharge air is continuously available and heat recovery can be integrated into the drying system. Blower-heated dryers are less dependent on compressor discharge heat and can therefore be easier to apply where compressor operating conditions vary.
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