Adsorption and Regeneration Direction
- Adsorption dryers are typically designed with two towers, one adsorbing while the other undergoes desorption and regeneration.
- During adsorption, most of the moisture remains at the upstream end, where it first contacts the adsorbent.
The further downstream, the lower the moisture content in the compressed air. Until at the outlet end, compressed dry air meeting quality requirements is formed and then sent to the application end. - During desorption and regeneration, if the airflow is in the same direction as during adsorption, the moisture desorbed at the upstream end will move downstream. At this point, the adsorbent with less moisture downstream will re-adsorb the desorbed moisture. As mentioned above, the adsorbent is simultaneously undergoing desorption and regeneration while repeatedly re-adsorbing, resulting in a large waste of energy used for desorption. This phenomenon is called "re-adsorption."
- This is a serious design flaw in adsorption dryers. Although the co-current design for adsorption and regeneration can simplify piping and valve arrangements to reduce manufacturing costs.
However, regarding the design that invisibly wastes energy, our company reiterates its opposition.
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