With their external and autonomous regeneration equipment, these dryers are independent of compressor operation. Widely differing regeneration energy sources as heat carriers result in a flexible, economical utilisation also in explosion proof areas. Pressure dew points down to -55°C can reliably be achieved with continuous running. Expansion during switch-over and the pressure release made necessary by this, occurs only once within the hour cycle and can be made to take place in a delayed manner, thus achieving reduced values of the noise emission level. The regeneration and cooling air can be polluted by solids, in cases of installation in dust generating branches of industry, and this may influence not only the adsorber but also its adsorbing material. Increasing differential pressure inside the adsorber impairs the flow of regeneration air, resulting in a proportionally longer heating time. High inlet temperatures accompanied by low operating pressure reduce the capacity of the drying medium considerably, at the same time increasing the heat of reaction up to the lower range of regeneration temperatures, so that reliable adsorption is no longer assured throughout the entire time. Externally heat regenerated adsorption dryers are used
- in capacity ranges of up to 15 000m3/h
- as special design installations up to 50 000m3/h and more
- for pressure dewpoints down to -55°C
- in the medium pressure ranges
- with medium inlet temperatures
