Adsorption dryers with internal heat regeneration need only a small share of the compressed air already dried in order to effect regeneration and can achieve pressure dewpoints of down to -70°C in continuous operation.
Photo 5.4.6.1
At high pressure ranges and low entry temperatures, the quantity of regeneration and cooling air required becomes less. At low operating pressure and high inlet temperature, a correspondingly larger quantity of regeneration and cooling air is required in order to effect regeneration. High inlet temperature accompanied by low operating pressure significantly reduces the capacity of the drying medium. If this is accompanied by a rise in the heat of reaction up to the lower range of regeneration temperature, compressed air drying can under certain circumstances be considerably impaired by such unfavourable operating conditions. Expansion of the compressed air upon pressure release, once during each cycle, forms the only noise pollution caused by the adsorption dryer at the place of installation. Pressure release can be slowed down, thus further diminishing the emitted noise level. Adsorption dryers with heat regeneration are, in preference, used In the performance range of 1000-6000m3/h For pressure dewpoints down to -70°C
In the medium pressure range
At medium inlet temperatures
For CO2 gas drying
If the ambient air contains a high dust level
In an atmosphere rich in toxic substances
