Using an adsorption dryer in a branch line for the purpose of drying a portion of the overall flow which has been pre-dried by the refrigeration dryer, is sketched in Fig. 10.4.9.1 In the preceding examples, installation of an adsorption dryer into a branch line is subjected to basic consideration regarding:
- Moisture load
- Selection of the drying medium
- Refrigeration dryer operation
- Automatic control
- Adsorption dryer size
Automatic control of the adsorption dryer operation in relation to the pressure dewpoint of the refrigeration dryer is achieved if the adsorption dryer is equipped with Dewpoint Dependent control. The variable cycle times adapted to the current operating state at any time, justify such a control system even for smaller adsorption dryers.
Figure 10.4.9.1
The refrigeration dryer fault signal is not always available to the adsorption dryer as signal for switching over the cycle times. Distances between the centrally installed refrigeration dryer and the decentralised mounting of the adsorption dryer can, in practice, be very far apart and thus practically exclude direct electrical connection.
