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• Energy Saving Technology
• 2025-02-24

Parallel Adsorption

• Adsorption dryers are designed with two towers that switch and operate alternately.
  If a valve malfunctions during switching, there is a concern about interruption of air supply.
  
  To prevent air supply interruption, there are usually two solutions:
  1. Use three-way or four-way valves
  2. The valve switching sequence is "open first, then close."
  
  
• From the start to the completion of the switching process, both adsorption towers will have compressed air flowing in simultaneously. This process is called parallel adsorption, and its duration is very short, usually no more than one minute. In design, it is a safety consideration to prevent air supply interruption.
  
  
• Commercially available zero-purge circulating cooling models, in order to overcome the moisture contamination problem, not only design the heating and cooling processes in reverse but also set the cooling stop temperature above 70℃. This often causes a temperature shock phenomenon when the adsorption towers switch, leading to moisture breakthrough and dew point spikes.
  
  
• Extending the parallel adsorption time allows the compressed air from both towers to mix, reducing the drastic impact of dew point spikes on the outlet quality of the compressed dry air. Although it can improve the data presentation, the duration of the spikes will be prolonged.
  
  
• Parallel adsorption is an expedient design, not a formal specification. However, there are often upside-down practices in the market that mandate dryers to have a sufficiently long parallel adsorption time design, leaving one speechless.

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