Three Factors Affecting the Drying Performance of Desiccant Air Dryers

Both refrigerated compressed air dryers (hereinafter referred to as refrigerated air dryers) and compressed air desiccant dryers 

(hereinafter referred to as desiccant air dryers) belong to compressed air post-treatment equipment. Their primary function is to remove moisture from compressed air so that the air meets quality standards.

Nevertheless, desiccant air dryers (such as twin-tower dryers) have certain technical limitations, which may lead to poor drying performance. What are the key factors that affect the drying effect of desiccant air dryers?
Influencing Factors
1. Breakage of Desiccants
Intensified collision and friction between desiccant particles cause severe pulverization, weakening the moisture absorption capacity.
Desiccant dust tends to clog the muffler and downstream pipeline filters of the dryer, reducing the filtering performance.
2. Uneven Airflow Distribution

Normally, the diameter of the dryer inlet pipeline is far smaller than that of the adsorption tower. Driven by initial pressure and flow velocity, 

compressed air tends to rush through the packing bed in concentrated streams, resulting in uneven gas distribution.

Under such circumstances, a large portion of the packing cannot be fully utilized, forming adsorption dead zones. This drastically lowers the utilization rate of desiccants and reduces adsorption efficiency.
3. Loose Desiccant Packing
Adsorption towers feature large volume and deep beds. In addition, molecular sieve and activated alumina differ in particle size and structure, making uniform and tight packing difficult to achieve.
Uneven and loose packing will aggravate the tunneling effect and impair drying performance.
The adsorption efficiency drops significantly and the dew point rises.
Once tunneling occurs, compressed air flows through at a higher speed. Moisture cannot be fully adsorbed before the air passes through the tower...