Desiccant Dryers

DB series

Desiccant dryers DB series

For flow rates from 710 – 13,550 m3/h

Benefits and Features

  • External-heat regeneration system
  • No loss of compressed air for regeneration or cooling
  • Pressure drop lower than 0.1 bar at full capacity
  • Sophisticated PLC control and communication unit
  • Parallel drying phase for steady dewpoint performance
  • Low maintenance and long-life desiccant

Design specifications

  • Fully-automatic and continuous cycle control
  • Steel support frame with foundation holes
  • Pressure vessels according to various industrial designs, codes and regulations
  • „Heavy-duty“ blower system
  • Easy-access to the heating system and the single-replaceable elements
  • Control box with IP54 rating
  • Temperature and pressure indicators on both vessels
  • Compressor Start-Stop function linked into drying cycle
  • Dewpoint-controlled cycle with indication and dewpoint setting
  • PLC (Siemens S-series) controls offering:
    • Fully automatic cycle
    • Alarm indication for all important dryer functions
    • Memory of alarm history
    • Fast-run cycle test
    • Display of required service intervals
    • Communication port to remote systems (optional)
  • Thermal insulation of all hot parts
  • Top-to-bottom flow direction avoiding fluidisation of adsorbent bed
  • Epoxy painting RAL 9001
  • All butterfly valves for lowest pressure drop

Available options according to customer specifications

  • Installed filtration package
  • By-pass over complete dryer
  • Different PLC types
  • Outdoor installation
  • Pressure dewpoint -70°C
  • Steam regeneration system
  • Other options available on request

How it works

This heat-regenerated Desiccant Dryer is the most commonly used in medium-sized to big-sized compressed air installations (from 350 to 13,000 m3/h). As opposed to the internally-heated dryers, the heaters used for regeneration are easy to control, simple to service and they can optionally be combined with steam heating.

  • In these dryers, the flow during the drying and during the regeneration are both from top to bottom. This principle offers the following advantages:
  • An optimal utilisation of the regeneration energy and heat of adsorption
  • No dewpoints peaks during changeover
  • Protection against appearance of liquid water
  • No loss of compressed air for the cooling process
  • Protection of the desiccant at starting of the compressor and from pressure and flow fluctuations.

Delair DB dryers do not make use of any compressed air and have a maximal pressure drop of 0.1 bar. This drying principle also offers the possibility of an Energy Management System with ample technical and economical advantages. A special option is the “closed-loop” cooling, which makes it possible to use the dryer with high ambient temperature or when a pressure dewpoint of -70°C is required. Also under such conditions, no compressed air is used for regeneration or cooling.

The DB series dryers are simple to operate and are equipped with a display showing current information and historical operating data. Extra communication modules for connection with higher-level process control systems are also available.