The suction dryer is also called an adsorption dryer. There are mainly two adsorption towers, which alternately carry out adsorption and regeneration processes. The adsorption tower is mainly filled with activated alumina balls and molecular sieve adsorbents.
Molecular sieves have higher adsorption capacity than activated alumina spheres, so they are also called adsorbents. The molecular sieve types that are packed in the suction tower of the dryer are mainly 4A and 13X molecular sieves. The latter has higher instantaneous adsorption capacity than the former, and the pore size is also large, so in addition to adsorbing moisture, it can also adsorb carbon dioxide, carbon monoxide, sulfur and other impurities in the air.
