The blower purge desiccant air dryer is an energy-efficient compressed air drying system that removes moisture by blowing and heating ambient air, while minimizing operational costs by utilizing ambient air for regeneration. Unlike conventional dryers that consume a significant portion of the dried compressed air for regeneration, this design employs a blower-driven regeneration process, effectively reducing compressed air losses and optimizing overall energy efficiency.

The operating principle is based on pressure swing adsorption, similar to traditional desiccant dryers, but with a distinct blower purge regeneration process. This process involves a sequence of stages: adsorption, regeneration, cooling, and equalization. During regeneration, ambient air is compressed by a blower, then heated to the required regeneration temperature before being directed through the adsorbent bed. The heated air desorbs the accumulated moisture from the desiccant, which is then carried out of the system along with the exhaust air.

After the heating phase, the system undergoes a cooling stage to bring the bed temperature down to a stable level suitable for the next adsorption cycle. This cooling air can be sourced from the dry air stream, depressurized for use as a cooling medium, or through air circulation with separation for optimal efficiency. This critical step ensures that residual heat does not cause dew point instability at the outlet during the next cycle.