Adsorption dryer

The ALM-CDA cold-regenerating adsorption dryers are used where compressed air has to be dried to a pressure dew point of -20°C, -40°C or optionally -70°C. The series offer compact design and simple operation.

Key data:

• Pressure dew point: -20°C, -40°C, -70°C
• Volume flow rates: up to 4200 m3/h
• Operating pressure: 4 - 16 bar (g)
• Ambient temperature: +1 - +50°C

ALMiG offers two control systems for the ALM-CDA adsorption dryers:

1. PLC (time-based control)
   The HDD adsorption dryer has a time-based PLC control as standard. The standard cycle has five minutes of adsorption, followed by four minutes of desorption (removal of deposited water vapour from the desiccant) and one minute for pressure build-up.
2. LCS (load dependent control)
   The LCS control is a load-dependent control that allows energy savings. Instead of the five-minute cycle of the time-based control, the LCS control has a dew point sensor that measures the moisture content at the dryer outlet. The dryer only regenerates when the set dew point is exceeded. This saves purge air and thus energy.

Features and benefits:

• Welded vessels according to ASME or PED standard. Other standards and approvals on request
• The use of self-cleaning wedge wire made of stainless steel in the humid area enables an even distribution of the air flow through the dryer with a low differential pressure
• Indicator lights for on/off function, adsorption, desorption and LED indication of dew point (if a dew point sensor is installed)
• Use of a high-performance molecular sieve for use in a wide range of conditions
• Use of standard industrial valves for quick change or maintenance
• Customised versions available on request
• Easy maintenance

Two vessels connected in parallel are required for the continuous drying process by means of adsorption drying. Each vessel is filled with desiccants which act as a drying medium.
For ALMiG heat regenerating adsorption dryers ALM-WDA high performance desiccants are used, which have a long lifetime at high inlet temperatures and thus provide very low pressure dew points.
The advantage of a vacuum system over other heat regenerating systems is the lower evaporation temperature. Under vacuum conditions, water evaporates at a lower temperature than under pressure conditions. This shortens the heating time, which is cost effective in terms of energy savings.

Advantages:

• The welded steel tanks are designed according to PED 2014/68/EU (other standards and approvals are available upon request).
• A stainless steel slotted screen in the wet end of the vessel is a self-cleaning system that provides uniform distribution of airflow with low pressure differential throughout the system
• Touch screen control for continuous monitoring to communicate with customer's control equipment via integration of Profibus and Modbus interfaces
• Additional integrated monitoring of inlet and outlet temperatures
• Features load sensing control (LCS) as a standard feature
• Uses standard industrial valves for fast availability and easy maintenance
• Low energy consumption, fast return on investment
• No purge air is required for regeneration /
• "ZERO PURGE"